Rev 385 | Rev 396 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1 | ingob | 1 | /*#######################################################################################*/ |
2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
||
3 | /*#######################################################################################*/ |
||
4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
||
5 | // + www.MikroKopter.com |
||
6 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
||
360 | holgerb | 7 | // + Software Nutzungsbedingungen (english version: see below) |
8 | // + der Fa. HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland - nachfolgend Lizenzgeber genannt - |
||
9 | // + Der Lizenzgeber räumt dem Kunden ein nicht-ausschließliches, zeitlich und räumlich* unbeschränktes Recht ein, die im den |
||
10 | // + Mikrocontroller verwendete Firmware für die Hardware Flight-Ctrl, Navi-Ctrl, BL-Ctrl, MK3Mag & PC-Programm MikroKopter-Tool |
||
11 | // + - nachfolgend Software genannt - nur für private Zwecke zu nutzen. |
||
12 | // + Der Einsatz dieser Software ist nur auf oder mit Produkten des Lizenzgebers zulässig. |
||
1 | ingob | 13 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
360 | holgerb | 14 | // + Die vom Lizenzgeber gelieferte Software ist urheberrechtlich geschützt. Alle Rechte an der Software sowie an sonstigen im |
15 | // + Rahmen der Vertragsanbahnung und Vertragsdurchführung überlassenen Unterlagen stehen im Verhältnis der Vertragspartner ausschließlich dem Lizenzgeber zu. |
||
16 | // + Die in der Software enthaltenen Copyright-Vermerke, Markenzeichen, andere Rechtsvorbehalte, Seriennummern sowie |
||
17 | // + sonstige der Programmidentifikation dienenden Merkmale dürfen vom Kunden nicht verändert oder unkenntlich gemacht werden. |
||
18 | // + Der Kunde trifft angemessene Vorkehrungen für den sicheren Einsatz der Software. Er wird die Software gründlich auf deren |
||
19 | // + Verwendbarkeit zu dem von ihm beabsichtigten Zweck testen, bevor er diese operativ einsetzt. |
||
20 | // + Die Haftung des Lizenzgebers wird - soweit gesetzlich zulässig - begrenzt in Höhe des typischen und vorhersehbaren |
||
21 | // + Schadens. Die gesetzliche Haftung bei Personenschäden und nach dem Produkthaftungsgesetz bleibt unberührt. Dem Lizenzgeber steht jedoch der Einwand |
||
22 | // + des Mitverschuldens offen. |
||
23 | // + Der Kunde trifft angemessene Vorkehrungen für den Fall, dass die Software ganz oder teilweise nicht ordnungsgemäß arbeitet. |
||
24 | // + Er wird die Software gründlich auf deren Verwendbarkeit zu dem von ihm beabsichtigten Zweck testen, bevor er diese operativ einsetzt. |
||
25 | // + Der Kunde wird er seine Daten vor Einsatz der Software nach dem Stand der Technik sichern. |
||
26 | // + Der Kunde ist darüber unterrichtet, dass der Lizenzgeber seine Daten im zur Vertragsdurchführung erforderlichen Umfang |
||
27 | // + und auf Grundlage der Datenschutzvorschriften erhebt, speichert, verarbeitet und, sofern notwendig, an Dritte übermittelt. |
||
28 | // + *) Die räumliche Nutzung bezieht sich nur auf den Einsatzort, nicht auf die Reichweite der programmierten Software. |
||
29 | // + #### ENDE DER NUTZUNGSBEDINGUNGEN ####' |
||
30 | // + Hinweis: Informationen über erweiterte Nutzungsrechte (wie z.B. Nutzung für nicht-private Zwecke) sind auf Anfrage per Email an info(@)hisystems.de verfügbar. |
||
1 | ingob | 31 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
360 | holgerb | 32 | // + Software LICENSING TERMS |
1 | ingob | 33 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
360 | holgerb | 34 | // + of HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland, Germany - the Licensor - |
35 | // + The Licensor grants the customer a non-exclusive license to use the microcontroller firmware of the Flight-Ctrl, Navi-Ctrl, BL-Ctrl, and MK3Mag hardware |
||
36 | // + (the Software) exclusively for private purposes. The License is unrestricted with respect to time and territory*. |
||
37 | // + The Software may only be used with the Licensor's products. |
||
38 | // + The Software provided by the Licensor is protected by copyright. With respect to the relationship between the parties to this |
||
39 | // + agreement, all rights pertaining to the Software and other documents provided during the preparation and execution of this |
||
40 | // + agreement shall be the property of the Licensor. |
||
41 | // + The information contained in the Software copyright notices, trademarks, other legal reservations, serial numbers and other |
||
42 | // + features that can be used to identify the program may not be altered or defaced by the customer. |
||
43 | // + The customer shall be responsible for taking reasonable precautions |
||
44 | // + for the safe use of the Software. The customer shall test the Software thoroughly regarding its suitability for the |
||
45 | // + intended purpose before implementing it for actual operation. The Licensor's liability shall be limited to the extent of typical and |
||
46 | // + foreseeable damage to the extent permitted by law, notwithstanding statutory liability for bodily injury and product |
||
47 | // + liability. However, the Licensor shall be entitled to the defense of contributory negligence. |
||
48 | // + The customer will take adequate precautions in the case, that the software is not working properly. The customer will test |
||
49 | // + the software for his purpose before any operational usage. The customer will backup his data before using the software. |
||
50 | // + The customer understands that the Licensor collects, stores and processes, and, where required, forwards, customer data |
||
51 | // + to third parties to the extent necessary for executing the agreement, subject to applicable data protection and privacy regulations. |
||
52 | // + *) The territory aspect only refers to the place where the Software is used, not its programmed range. |
||
53 | // + #### END OF LICENSING TERMS #### |
||
54 | // + Note: For information on license extensions (e.g. commercial use), please contact us at info(@)hisystems.de. |
||
1 | ingob | 55 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
41 | ingob | 56 | #include <stdio.h> |
379 | holgerb | 57 | #include <string.h> |
41 | ingob | 58 | #include "91x_lib.h" |
119 | killagreg | 59 | #include "timer1.h" |
41 | ingob | 60 | #include "fat16.h" |
61 | #include "sdc.h" |
||
62 | #include "uart1.h" |
||
379 | holgerb | 63 | #include "main.h" |
385 | holgerb | 64 | #include "logging.h" |
379 | holgerb | 65 | |
383 | holgerb | 66 | |
1 | ingob | 67 | //________________________________________________________________________________________________________________________________________ |
88 | killagreg | 68 | // Module name: fat16.c |
1 | ingob | 69 | // Compiler used: avr-gcc 3.4.5 |
211 | killagreg | 70 | // Last Modifikation: 20.03.2010 |
71 | // Version: 2.10 |
||
88 | killagreg | 72 | // Authors: Stephan Busker & Gregor Stobrawa |
41 | ingob | 73 | // Description: Source files for FAT16 implementation with read and write-access |
74 | // Copyright (C) 2008 Stephan Busker & Gregor Stobrawa |
||
1 | ingob | 75 | //........................................................................................................................................ |
41 | ingob | 76 | // Functions: extern s16 Fat16_Init(void); |
88 | killagreg | 77 | // extern s16 Fat16_Deinit(void); |
211 | killagreg | 78 | // extern s8* FAT16_GetVolumeLabel(void); |
41 | ingob | 79 | // extern File_t * fopen_(const u8 *filename, const s8 mode); |
80 | // extern s16 fclose_(File_t *File); |
||
211 | killagreg | 81 | // extern u8 fexist_(s8 * const filename); |
41 | ingob | 82 | // extern s16 fflush_(File_t *File); |
83 | // extern s16 fseek_(File_t *File, s32 offset, s16 origin); |
||
84 | // extern s16 fgetc_(File_t *File); |
||
85 | // extern s16 fputc_(u8 c, File_t *File); |
||
88 | killagreg | 86 | // extern u32 fread_(void *buffer, u32 size, u32 count, File_t *File); |
41 | ingob | 87 | // extern u32 fwrite_(void *buffer, u32 size, u32 count, File_t *File); |
88 | // extern s16 fputs_(const u8 *string, File_t *File); |
||
89 | // extern u8 * fgets_(u8 *string, s16 length, File_t *File); |
||
211 | killagreg | 90 | // extern u8 feof_(File_t * const file); |
1 | ingob | 91 | //........................................................................................................................................ |
41 | ingob | 92 | // ext. functions: extern SD_Result_t SDC_Init(void;) |
93 | // extern SD_Result_t SDC_Deinit(void); |
||
88 | killagreg | 94 | // extern SD_Result_t SDC_GetSector (u32,u8 *); |
41 | ingob | 95 | // extern SD_Result_t SDC_PutSector (u32,u8 *); |
1 | ingob | 96 | //........................................................................................................................................ |
97 | // |
||
98 | // URL: www.Mikro-Control.de |
||
99 | // mailto: stephan.busker@mikro-control.de |
||
100 | //________________________________________________________________________________________________________________________________________ |
||
101 | |||
41 | ingob | 102 | /* |
103 | FAT16 Drive Layout: |
||
104 | Description Offset |
||
105 | Volume Boot Sector Start of Partition |
||
106 | Fat Tables Start + # of Reserved Sectors |
||
107 | Root Directory Entry Start + # of Reserved + (# of Sectors Per FAT * 2) |
||
108 | Data Area (Starts with Cluster #2) Start + # of Reserved + (# of Sectors Per FAT * 2) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
||
109 | */ |
||
1 | ingob | 110 | |
111 | |||
379 | holgerb | 112 | |
41 | ingob | 113 | /* |
114 | ________________________________________________________________________________________________________________________________________ |
||
88 | killagreg | 115 | |
116 | Structure of an partition entry |
||
41 | ingob | 117 | ________________________________________________________________________________________________________________________________________ |
1 | ingob | 118 | |
41 | ingob | 119 | Partition Entry is 16 bytes long |
120 | */ |
||
121 | typedef struct |
||
122 | { |
||
123 | u8 PartitionState; // Current State of Partition (00h=Inactive, 80h=Active) |
||
124 | u8 BeginningHead; // Beginning of Partition - Head |
||
125 | u16 BeginningCylSec; // Beginning of Partition - Cylinder/Sector (See Below) |
||
126 | u8 Type; // Type of Partition (See List Below) |
||
127 | u8 EndHead; // End of Partition - Head |
||
128 | u16 EndCylSec; // End of Partition - Cylinder/Sector |
||
129 | u32 NoSectorsBeforePartition; // Number of Sectors between the MBR and the First Sector in the Partition |
||
130 | u32 NoSectorsPartition ; // Number of Sectors in the Partition |
||
88 | killagreg | 131 | } __attribute__((packed)) PartitionEntry_t; |
1 | ingob | 132 | |
379 | holgerb | 133 | |
134 | |||
41 | ingob | 135 | /* |
136 | Coding of Cylinder/Sector words |
||
1 | ingob | 137 | |
41 | ingob | 138 | Cylinder is 10 bits: [7:0] at [15:8] and [9:8] at [7:6] |
88 | killagreg | 139 | Sector is 5 bits: [5:0] at [5:0] |
41 | ingob | 140 | */ |
1 | ingob | 141 | |
41 | ingob | 142 | // Partition Types: |
143 | #define PART_TYPE_UNKNOWN 0x00 |
||
144 | #define PART_TYPE_FAT12 0x01 |
||
145 | #define PART_TYPE_XENIX 0x02 |
||
146 | #define PART_TYPE_FAT16_ST_32_MB 0x04 |
||
147 | #define PART_TYPE_EXTDOS 0x05 |
||
148 | #define PART_TYPE_FAT16_LT_32_MB 0x06 |
||
149 | #define PART_TYPE_NTFS 0x07 |
||
150 | #define PART_TYPE_FAT32 0x0B |
||
151 | #define PART_TYPE_FAT32LBA 0x0C |
||
152 | #define PART_TYPE_FAT16LBA 0x0E |
||
153 | #define PART_TYPE_EXTDOSLBA 0x0F |
||
154 | #define PART_TYPE_EISA 0x12 |
||
155 | #define PART_TYPE_ONTRACK 0x33 |
||
156 | #define PART_TYPE_NOVELL 0x40 |
||
157 | #define PART_TYPE_DYNAMIC 0x42 |
||
158 | #define PART_TYPE_PCIX 0x4B |
||
159 | #define PART_TYPE_LINUX_SWAP 0x82 |
||
160 | #define PART_TYPE_LINUX_NATIVE 0x83 |
||
161 | #define PART_TYPE_LINUX_LVM 0x8E |
||
162 | #define PART_TYPE_PHOENIXSAVE 0xA0 |
||
163 | #define PART_TYPE_FREEBSD 0xA5 |
||
164 | #define PART_TYPE_OPENBSD 0xA6 |
||
165 | #define PART_TYPE_NETNBSD 0xA9 |
||
166 | #define PART_TYPE_CPM 0xDB |
||
167 | #define PART_TYPE_DBFS 0xE0 |
||
168 | #define PART_TYPE_BBT 0xFF |
||
1 | ingob | 169 | |
170 | |||
41 | ingob | 171 | /* |
172 | ________________________________________________________________________________________________________________________________________ |
||
88 | killagreg | 173 | |
174 | Structure of the MasterBootRecord |
||
41 | ingob | 175 | ________________________________________________________________________________________________________________________________________ |
1 | ingob | 176 | |
41 | ingob | 177 | Master Boot Record is 512 bytes long |
178 | The Master Boot Record is the same for pretty much all Operating Systems. |
||
179 | It is located on the first Sector of the Hard Drive, at Cylinder 0, Head 0, Sector 1 |
||
180 | */ |
||
181 | typedef struct |
||
182 | { |
||
88 | killagreg | 183 | u8 ExecutableCode[446]; // 446 bytes for machine start code |
184 | PartitionEntry_t PartitionEntry1; // 16 bytes for partition entry 1 |
||
185 | PartitionEntry_t PartitionEntry2; // 16 bytes for partition entry 2 |
||
186 | PartitionEntry_t PartitionEntry3; // 16 bytes for partition entry 3 |
||
187 | PartitionEntry_t PartitionEntry4; // 16 bytes for partition entry 4 |
||
188 | u16 ExecutableMarker; // BIOS-Signature (0x55 0xAA) |
||
189 | } __attribute__((packed)) MBR_Entry_t; |
||
1 | ingob | 190 | |
191 | |||
41 | ingob | 192 | /* |
193 | ________________________________________________________________________________________________________________________________________ |
||
88 | killagreg | 194 | |
195 | Structure of the VolumeBootRecord |
||
41 | ingob | 196 | ________________________________________________________________________________________________________________________________________ |
24 | StephanB | 197 | |
41 | ingob | 198 | The Volume Boot Record is 512 bytes long |
199 | This information is located in the first sector of every partition. |
||
200 | */ |
||
201 | typedef struct |
||
202 | { |
||
203 | u8 JumpCode[3]; // Jump Code + NOP |
||
88 | killagreg | 204 | s8 OEMName[8]; // OEM Name |
41 | ingob | 205 | u16 BytesPerSector; // Bytes Per Sector |
206 | u8 SectorsPerCluster; // Sectors Per Cluster |
||
207 | u16 ReservedSectors; // Reserved Sectors |
||
208 | u8 NoFATCopies; // Number of Copies of FAT |
||
88 | killagreg | 209 | u16 MaxRootEntries; // Maximum Root Directory Entries |
41 | ingob | 210 | u16 NoSectorsInPartSml32MB; // Number of Sectors in Partition Smaller than 32 MB |
211 | u8 MediaDescriptor; // Media Descriptor (0xF8 for Hard Disks) |
||
212 | u16 SectorsPerFAT; // Sectors Per FAT |
||
213 | u16 SectorsPerTrack; // Sectors Per Track |
||
214 | u16 NoHeads; // Number of Heads |
||
215 | u32 NoHiddenSectors; // Number of Hidden Sectors in Partition |
||
216 | u32 NoSectors; // Number of Sectors in Partition |
||
217 | u16 DriveNo; // Logical Drive Number of Partition |
||
218 | u8 ExtendedSig; // Extended Signature (0x29) |
||
219 | u32 SerialNo; // Serial Number of the Partition |
||
220 | s8 VolumeName[11]; // Volume Name of the Partititon |
||
221 | s8 FATName[8]; // FAT Name (FAT16) |
||
88 | killagreg | 222 | u8 ExecutableCode[446]; // 446 bytes for machine start code |
223 | u16 ExecutableMarker; // Executable Marker (0x55 0xAA) |
||
224 | } __attribute__((packed)) VBR_Entry_t; |
||
1 | ingob | 225 | |
226 | |||
227 | |||
41 | ingob | 228 | /* |
229 | ________________________________________________________________________________________________________________________________________ |
||
230 | |||
88 | killagreg | 231 | Structure of an directory entry |
41 | ingob | 232 | ________________________________________________________________________________________________________________________________________ |
233 | |||
234 | Directory entry is 32 bytes. |
||
235 | */ |
||
236 | typedef struct |
||
1 | ingob | 237 | { |
41 | ingob | 238 | s8 Name[8]; // 8 bytes name, padded with spaces. |
239 | u8 Extension[3]; // 3 bytes extension, padded with spaces. |
||
240 | u8 Attribute; // attribute of the directory entry (unused,archive,read-only,system,directory,volume) |
||
211 | killagreg | 241 | u8 Res1; // should be zero |
242 | u8 CreationTime10ms; // subsecond resolution of creation time |
||
243 | u16 CreationTime; // Time of creation h:m:s |
||
244 | u16 CreationDate; // Date of creation Y.M.D |
||
245 | u16 LastAccessDate; // The date where the file was last accessed |
||
246 | u8 Res2[2]; // should be zero |
||
247 | u16 ModTime; // date of last write access |
||
248 | u16 ModDate; // date of last write access to the file or directory. |
||
41 | ingob | 249 | u16 StartCluster; // first cluster of the file or directory. |
250 | u32 Size; // size of the file or directory in bytes. |
||
251 | } __attribute__((packed)) DirEntry_t; |
||
1 | ingob | 252 | |
41 | ingob | 253 | #define SLOT_EMPTY 0x00 // slot has never been used |
254 | #define SLOT_E5 0x05 // the real value is 0xe5 |
||
255 | #define SLOT_DELETED 0xE5 // file in this slot deleted |
||
1 | ingob | 256 | |
41 | ingob | 257 | #define ATTR_NONE 0x00 // normal file |
258 | #define ATTR_READONLY 0x01 // file is readonly |
||
259 | #define ATTR_HIDDEN 0x02 // file is hidden |
||
260 | #define ATTR_SYSTEM 0x04 // file is a system file |
||
261 | #define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
||
262 | #define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
||
263 | #define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
||
264 | #define ATTR_ARCHIVE 0x20 // file is new or modified |
||
24 | StephanB | 265 | |
266 | |||
41 | ingob | 267 | /* |
268 | ________________________________________________________________________________________________________________________________________ |
||
88 | killagreg | 269 | |
270 | Structure of an entry within the fileallocationtable. |
||
41 | ingob | 271 | ________________________________________________________________________________________________________________________________________ |
272 | */ |
||
273 | typedef struct |
||
274 | { |
||
275 | u16 NextCluster; // the next cluster of the file. |
||
276 | } __attribute__((packed)) Fat16Entry_t; |
||
1 | ingob | 277 | |
41 | ingob | 278 | // secial fat entries |
279 | #define FAT16_CLUSTER_FREE 0x0000 |
||
280 | #define FAT16_CLUSTER_RESERVED 0x0001 |
||
281 | #define FAT16_CLUSTER_USED_MIN 0x0002 |
||
282 | #define FAT16_CLUSTER_USED_MAX 0xFFEF |
||
283 | #define FAT16_CLUSTER_ROOTDIR_MIN 0xFFF0 |
||
284 | #define FAT16_CLUSTER_ROOTDIR_MAX 0xFFF6 |
||
285 | #define FAT16_CLUSTER_BAD 0xFFF7 |
||
286 | #define FAT16_CLUSTER_LAST_MIN 0xFFF8 |
||
287 | #define FAT16_CLUSTER_LAST_MAX 0xFFFF |
||
288 | |||
88 | killagreg | 289 | /*****************************************************************************************************************************************/ |
41 | ingob | 290 | /* */ |
291 | /* Global variables needed for read- or write-acces to the FAT16- filesystem. */ |
||
292 | /* */ |
||
293 | /*****************************************************************************************************************************************/ |
||
294 | |||
295 | #define MBR_SECTOR 0x00 // the masterboot record is located in sector 0. |
||
296 | #define DIRENTRY_SIZE 32 //bytes |
||
297 | #define DIRENTRIES_PER_SECTOR BYTES_PER_SECTOR/DIRENTRY_SIZE |
||
298 | #define FAT16_BYTES 2 |
||
299 | #define FAT16_ENTRIES_PER_SECTOR BYTES_PER_SECTOR/FAT16_BYTES |
||
300 | |||
211 | killagreg | 301 | #define SECTOR_UNDEFINED 0x00000000L |
302 | #define CLUSTER_UNDEFINED 0x0000 |
||
303 | |||
88 | killagreg | 304 | #define FSTATE_UNUSED 0 |
41 | ingob | 305 | #define FSTATE_USED 1 |
306 | |||
307 | typedef struct |
||
1 | ingob | 308 | { |
41 | ingob | 309 | u8 IsValid; // 0 means invalid, else valid |
310 | u8 SectorsPerCluster; // how many sectors does a cluster contain? |
||
311 | u8 FatCopies; // Numbers of copies of the FAT |
||
312 | u16 MaxRootEntries; // Possible number of entries in the root directory. |
||
313 | u16 SectorsPerFat; // how many sectors does a fat16 contain? |
||
314 | u32 FirstFatSector; // sector of the start of the fat |
||
315 | u32 FirstRootDirSector; // sector of the rootdirectory |
||
316 | u32 FirstDataSector; // sector of the first cluster containing data (cluster2). |
||
317 | u32 LastDataSector; // the last data sector of the partition |
||
379 | holgerb | 318 | u8 VolumeLabel[12]; // the volume label |
319 | u32 CurrentWorkingDirectory;// A pointer to the directory we are actual using |
||
320 | s8 PathToCwd[256]; // a string containing the complete path to the current working directory |
||
321 | } __attribute__((packed)) Partition_t; |
||
1 | ingob | 322 | |
379 | holgerb | 323 | Partition_t Partition; // Structure holds partition information |
1 | ingob | 324 | |
41 | ingob | 325 | File_t FilePointer[FILE_MAX_OPEN]; // Allocate Memmoryspace for each filepointer used. |
1 | ingob | 326 | |
41 | ingob | 327 | |
379 | holgerb | 328 | |
329 | |||
41 | ingob | 330 | /****************************************************************************************************************************************/ |
211 | killagreg | 331 | /* Function: FileDate(DateTime_t *); */ |
41 | ingob | 332 | /* */ |
211 | killagreg | 333 | /* Description: This function calculates the DOS date from a pointer to a time structure. */ |
41 | ingob | 334 | /* */ |
211 | killagreg | 335 | /* Returnvalue: Returns the DOS date. */ |
41 | ingob | 336 | /****************************************************************************************************************************************/ |
211 | killagreg | 337 | u16 FileDate(DateTime_t * pTimeStruct) |
338 | { |
||
339 | u16 date = 0; |
||
340 | if(pTimeStruct == NULL) return date; |
||
341 | if(!(pTimeStruct->Valid)) return date; |
||
41 | ingob | 342 | |
211 | killagreg | 343 | date |= (0x007F & (u16)(pTimeStruct->Year - 1980))<<9; // set year |
344 | date |= (0x000F & (u16)(pTimeStruct->Month))<<5; // set month |
||
345 | date |= (0x001F & (u16)(pTimeStruct->Day)); |
||
346 | return date; |
||
347 | } |
||
348 | |||
349 | /****************************************************************************************************************************************/ |
||
350 | /* Function: FileTime(DateTime_t *); */ |
||
351 | /* */ |
||
352 | /* Description: This function calculates the DOS time from a pointer to a time structure. */ |
||
353 | /* */ |
||
354 | /* Returnvalue: Returns the DOS time. */ |
||
355 | /****************************************************************************************************************************************/ |
||
356 | |||
357 | u16 FileTime(DateTime_t * pTimeStruct) |
||
1 | ingob | 358 | { |
211 | killagreg | 359 | u16 time = 0; |
360 | if(pTimeStruct == NULL) return time; |
||
361 | if(!(pTimeStruct->Valid)) return time; |
||
24 | StephanB | 362 | |
211 | killagreg | 363 | time |= (0x001F & (u16)(pTimeStruct->Hour))<<11; |
364 | time |= (0x003F & (u16)(pTimeStruct->Min))<<5; |
||
365 | time |= (0x001F & (u16)(pTimeStruct->Sec/2)); |
||
366 | return time; |
||
1 | ingob | 367 | } |
368 | |||
41 | ingob | 369 | /****************************************************************************************************************************************/ |
370 | /* Function: LockFilePointer(); */ |
||
371 | /* */ |
||
372 | /* Description: This function trys to lock a free file pointer. */ |
||
373 | /* */ |
||
374 | /* Returnvalue: Returns the Filepointer on success or 0. */ |
||
375 | /****************************************************************************************************************************************/ |
||
376 | File_t * LockFilePointer(void) |
||
1 | ingob | 377 | { |
41 | ingob | 378 | u8 i; |
379 | File_t * File = 0; |
||
380 | for(i = 0; i < FILE_MAX_OPEN; i++) |
||
1 | ingob | 381 | { |
88 | killagreg | 382 | if(FilePointer[i].State == FSTATE_UNUSED) // found an unused one |
1 | ingob | 383 | { |
88 | killagreg | 384 | File = &FilePointer[i]; // set pointer to that entry |
41 | ingob | 385 | FilePointer[i].State = FSTATE_USED; // mark it as used |
386 | break; |
||
1 | ingob | 387 | } |
41 | ingob | 388 | } |
389 | return(File); |
||
1 | ingob | 390 | } |
391 | |||
41 | ingob | 392 | /****************************************************************************************************************************************/ |
393 | /* Function: UnlockFilePointer(file_t *); */ |
||
394 | /* */ |
||
395 | /* Description: This function trys to unlock a file pointer. */ |
||
396 | /* */ |
||
397 | /* Returnvalue: Returns 1 if file pointer was freed else 0. */ |
||
398 | /****************************************************************************************************************************************/ |
||
399 | u8 UnlockFilePointer(File_t * file) |
||
1 | ingob | 400 | { |
41 | ingob | 401 | u8 cnt; |
402 | if(file == NULL) return(0); |
||
403 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
||
1 | ingob | 404 | { |
41 | ingob | 405 | if(&FilePointer[cnt] == file) // filepointer to be freed found? |
1 | ingob | 406 | { |
88 | killagreg | 407 | file->State = FSTATE_UNUSED; |
211 | killagreg | 408 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
409 | file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
||
41 | ingob | 410 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
411 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
||
412 | file->Mode = 0; // mode of fileoperation (read,write) |
||
413 | file->Size = 0; // the size of the opend file in bytes. |
||
414 | file->Position = 0; // pointer to a character within the file 0 < fileposition < filesize |
||
211 | killagreg | 415 | file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
416 | file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
||
41 | ingob | 417 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
418 | file->Attribute = 0; // the attribute of the file opened. |
||
88 | killagreg | 419 | file = NULL; |
41 | ingob | 420 | return(1); |
1 | ingob | 421 | } |
41 | ingob | 422 | } |
423 | return(0); |
||
424 | } |
||
1 | ingob | 425 | |
41 | ingob | 426 | /****************************************************************************************************************************************/ |
427 | /* Function: SeperateDirName(s8*, s8*); */ |
||
428 | /* */ |
||
429 | /* Description: This function seperates the first dirname from filepath and brings them */ |
||
430 | /* into the needed format ('test.txt' -> 'TEST TXT') */ |
||
210 | killagreg | 431 | /* The subpath is the pointer to the remaining substring of the filepath */ |
41 | ingob | 432 | /* */ |
433 | /* Returnvalue: Return NULL on error or pointer to subpath */ |
||
434 | /****************************************************************************************************************************************/ |
||
435 | s8* SeperateDirName(const s8 *filepath, s8 *dirname) |
||
436 | { |
||
437 | s8* subpath = NULL; |
||
438 | u8 readpointer = 0; |
||
439 | u8 writepointer = 0; |
||
1 | ingob | 440 | |
88 | killagreg | 441 | // search subpath from beginning of filepath |
41 | ingob | 442 | subpath = NULL; |
443 | readpointer = 0; |
||
444 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
||
368 | holgerb | 445 | while(subpath == NULL) // search the filepath until a subpath was found. |
1 | ingob | 446 | { |
88 | killagreg | 447 | if(((filepath[readpointer] == 0) || (filepath[readpointer] == '/'))) // if '/' found or end of filepath reached |
448 | { |
||
41 | ingob | 449 | subpath = (s8*)&filepath[readpointer]; // store the position of the first "/" found after the beginning of the filenpath |
450 | } |
||
451 | readpointer++; |
||
452 | } |
||
1 | ingob | 453 | |
41 | ingob | 454 | // clear dirname with spaces |
455 | dirname[11] = 0; // terminate dirname |
||
456 | for(writepointer = 0; writepointer < 11; writepointer++) dirname[writepointer] = ' '; |
||
379 | holgerb | 457 | |
458 | // handle the special dirnames "." and ".." seperately |
||
459 | readpointer = 0; |
||
460 | if(filepath[0] == '/') readpointer++; |
||
461 | // if we are trying to enter directories "." or ".." |
||
462 | if(filepath[readpointer] == '.') |
||
463 | { |
||
464 | // directory '.' |
||
465 | if(filepath[readpointer+1] == 0) |
||
466 | { |
||
467 | dirname[0] = '.'; |
||
468 | return((s8*)&filepath[readpointer]); |
||
469 | } |
||
470 | // directory '..' |
||
471 | if((filepath[readpointer+1] == '.') && (filepath[readpointer+2] == 0)) |
||
472 | { |
||
473 | dirname[0] = '.'; |
||
474 | dirname[1] = '.'; |
||
475 | return((s8*)&filepath[readpointer]); |
||
476 | } |
||
477 | } |
||
478 | |||
41 | ingob | 479 | writepointer = 0; |
480 | // start seperating the dirname from the filepath. |
||
481 | readpointer = 0; |
||
482 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
||
368 | holgerb | 483 | while( &filepath[readpointer] < subpath) |
1 | ingob | 484 | { |
41 | ingob | 485 | if(writepointer >= 11) return(NULL); // dirname to long |
486 | if(filepath[readpointer] == '.') // seperating dirname and extension. |
||
1 | ingob | 487 | { |
41 | ingob | 488 | if(writepointer <= 8) |
1 | ingob | 489 | { |
41 | ingob | 490 | readpointer++; // next character in filename |
491 | writepointer = 8; // jump to start of extension |
||
1 | ingob | 492 | } |
88 | killagreg | 493 | else return(NULL); // dirbasename to long |
41 | ingob | 494 | } |
495 | else |
||
496 | { |
||
497 | if((0x60 < filepath[readpointer]) && (filepath[readpointer] < 0x7B)) |
||
498 | { |
||
499 | dirname[writepointer] = (filepath[readpointer] - 0x20); // all characters must be upper case. |
||
500 | } |
||
1 | ingob | 501 | else |
502 | { |
||
41 | ingob | 503 | dirname[writepointer] = filepath[readpointer]; |
88 | killagreg | 504 | } |
41 | ingob | 505 | readpointer++; |
506 | writepointer++; |
||
1 | ingob | 507 | } |
41 | ingob | 508 | } |
88 | killagreg | 509 | return(subpath); |
1 | ingob | 510 | } |
511 | |||
512 | |||
41 | ingob | 513 | /**************************************************************************************************************************************+*/ |
514 | /* Function: Fat16ClusterToSector( u16 cluster); */ |
||
515 | /* */ |
||
516 | /* Description: This function converts a cluster number given by the fat to the corresponding */ |
||
517 | /* sector that points to the start of the data area that is represented by the cluster number. */ |
||
518 | /* */ |
||
519 | /* Returnvalue: The sector number with the data area of the given cluster */ |
||
520 | /****************************************************************************************************************************************/ |
||
521 | u32 Fat16ClusterToSector(u16 cluster) |
||
522 | { |
||
211 | killagreg | 523 | if(!Partition.IsValid) return SECTOR_UNDEFINED; |
218 | killagreg | 524 | if ((cluster < 2) || (cluster == CLUSTER_UNDEFINED)) |
211 | killagreg | 525 | { |
526 | return SECTOR_UNDEFINED; |
||
527 | } |
||
528 | else |
||
529 | { |
||
530 | return ( (cluster - 2) * Partition.SectorsPerCluster) + Partition.FirstDataSector; // the first data sector is represented by the 2nd cluster |
||
531 | } |
||
41 | ingob | 532 | } |
533 | |||
534 | /****************************************************************************************************************************************/ |
||
535 | /* Function: SectorToFat16Cluster( u32 sector); */ |
||
536 | /* */ |
||
537 | /* Description: This function converts a given sector number given to the corresponding */ |
||
538 | /* cluster number in the fat that represents this data area. */ |
||
539 | /* */ |
||
540 | /* Returnvalue: The cluster number representing the data area of the sector. */ |
||
541 | /****************************************************************************************************************************************/ |
||
542 | u16 SectorToFat16Cluster(u32 sector) |
||
543 | { |
||
211 | killagreg | 544 | if(!Partition.IsValid) return CLUSTER_UNDEFINED; |
545 | if((sector == SECTOR_UNDEFINED) || (sector < Partition.FirstDataSector)) return CLUSTER_UNDEFINED; |
||
546 | else return ((u16)((sector - Partition.FirstDataSector) / Partition.SectorsPerCluster) + 2); |
||
41 | ingob | 547 | } |
548 | |||
549 | |||
550 | /****************************************************************************************************************************************/ |
||
210 | killagreg | 551 | /* Function: Fat16_IsValid(void); */ |
90 | killagreg | 552 | /* */ |
210 | killagreg | 553 | /* Description: This function return the Fat 16 filesystem state */ |
90 | killagreg | 554 | /* */ |
555 | /* Returnvalue: The function returns "1" on success */ |
||
556 | /****************************************************************************************************************************************/ |
||
557 | u8 Fat16_IsValid(void) |
||
558 | { |
||
559 | return(Partition.IsValid); |
||
560 | } |
||
561 | |||
562 | /****************************************************************************************************************************************/ |
||
41 | ingob | 563 | /* Function: Fat16_Deinit(void); */ |
564 | /* */ |
||
565 | /* Description: This function uninitializes the fat 16 api */ |
||
566 | /* */ |
||
567 | /* Returnvalue: The function returns "0" on success */ |
||
568 | /****************************************************************************************************************************************/ |
||
569 | u8 Fat16_Deinit(void) |
||
570 | { |
||
571 | s16 returnvalue = 0; |
||
572 | u8 cnt; |
||
146 | killagreg | 573 | |
574 | UART1_PutString("\r\n FAT16 deinit..."); |
||
41 | ingob | 575 | // declare the filepointers as unused. |
576 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
||
324 | killagreg | 577 | { |
578 | UnlockFilePointer(&FilePointer[cnt]); |
||
1 | ingob | 579 | } |
324 | killagreg | 580 | returnvalue = SDC_Deinit(); // uninitialize interface to sd-card |
41 | ingob | 581 | Partition.IsValid = 0; // mark data in partition structure as invalid |
210 | killagreg | 582 | Partition.VolumeLabel[0]='\0'; |
146 | killagreg | 583 | UART1_PutString("ok"); |
385 | holgerb | 584 | if(SD_WatchDog > 2000) SD_WatchDog = 2000; |
585 | SD_LoggingError = 100; |
||
41 | ingob | 586 | return(returnvalue); |
1 | ingob | 587 | } |
588 | |||
41 | ingob | 589 | /****************************************************************************************************************************************/ |
590 | /* Function: Fat16_Init(void); */ |
||
591 | /* */ |
||
592 | /* Description: This function reads the Masterbootrecord and finds the position of the Volumebootrecord, the FAT and the Rootdir */ |
||
593 | /* and stores the information in global variables. */ |
||
594 | /* */ |
||
595 | /* Returnvalue: The function returns "0" if the filesystem is initialized. */ |
||
596 | /****************************************************************************************************************************************/ |
||
597 | u8 Fat16_Init(void) |
||
88 | killagreg | 598 | { |
41 | ingob | 599 | u8 cnt = 0; |
600 | u32 partitionfirstsector; |
||
88 | killagreg | 601 | VBR_Entry_t *VBR; |
41 | ingob | 602 | MBR_Entry_t *MBR; |
603 | File_t *file; |
||
604 | u8 result = 0; |
||
1 | ingob | 605 | |
110 | killagreg | 606 | UART1_PutString("\r\n FAT16 init..."); |
41 | ingob | 607 | Partition.IsValid = 0; |
608 | // declare the filepointers as unused. |
||
609 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
||
1 | ingob | 610 | { |
211 | killagreg | 611 | UnlockFilePointer(&FilePointer[cnt]); |
1 | ingob | 612 | } |
41 | ingob | 613 | // set current file pinter to first position in list |
88 | killagreg | 614 | file = &FilePointer[0]; |
615 | |||
211 | killagreg | 616 | // try to initialize the sd-card. |
88 | killagreg | 617 | if(SD_SUCCESS != SDC_Init()) |
618 | { |
||
110 | killagreg | 619 | UART1_PutString("SD-Card could not be initialized."); |
41 | ingob | 620 | result = 1; |
88 | killagreg | 621 | goto end; |
41 | ingob | 622 | } |
1 | ingob | 623 | |
41 | ingob | 624 | // SD-Card is initialized successfully |
625 | if(SD_SUCCESS != SDC_GetSector((u32)MBR_SECTOR,file->Cache)) // Read the MasterBootRecord |
||
1 | ingob | 626 | { |
110 | killagreg | 627 | UART1_PutString("Error reading the MBR."); |
41 | ingob | 628 | result = 2; |
88 | killagreg | 629 | goto end; |
1 | ingob | 630 | } |
41 | ingob | 631 | MBR = (MBR_Entry_t *)file->Cache; // Enter the MBR using the structure MBR_Entry_t. |
88 | killagreg | 632 | if((MBR->PartitionEntry1.Type == PART_TYPE_FAT16_ST_32_MB) || |
41 | ingob | 633 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16_LT_32_MB) || |
634 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16LBA)) |
||
1 | ingob | 635 | { |
41 | ingob | 636 | // get sector offset 1st partition |
637 | partitionfirstsector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
||
638 | // Start of Partition is the Volume Boot Sector |
||
639 | if(SD_SUCCESS != SDC_GetSector(partitionfirstsector,file->Cache)) // Read the volume boot record |
||
1 | ingob | 640 | { |
110 | killagreg | 641 | UART1_PutString("Error reading the VBR."); |
41 | ingob | 642 | result = 3; |
88 | killagreg | 643 | goto end; |
644 | } |
||
1 | ingob | 645 | } |
41 | ingob | 646 | else // maybe the medium has no partition assuming sector 0 is the vbr |
647 | { |
||
648 | partitionfirstsector = 0; |
||
649 | } |
||
88 | killagreg | 650 | |
41 | ingob | 651 | VBR = (VBR_Entry_t *) file->Cache; // Enter the VBR using the structure VBR_Entry_t. |
652 | if(VBR->BytesPerSector != BYTES_PER_SECTOR) |
||
653 | { |
||
110 | killagreg | 654 | UART1_PutString("VBR: Sector size not supported."); |
41 | ingob | 655 | result = 4; |
88 | killagreg | 656 | goto end; |
41 | ingob | 657 | } |
658 | Partition.SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
||
659 | Partition.FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
||
660 | Partition.MaxRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
||
210 | killagreg | 661 | Partition.SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT // copy volume label |
662 | Partition.VolumeLabel[0] = '\0'; // set string terminator |
||
41 | ingob | 663 | |
664 | /* Calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. */ |
||
88 | killagreg | 665 | // Calculate the position of the FileAllocationTable: |
41 | ingob | 666 | // Start + # of Reserved Sectors |
88 | killagreg | 667 | Partition.FirstFatSector = (u32)(partitionfirstsector + (u32)(VBR->ReservedSectors)); |
668 | // Calculate the position of the Rootdirectory: |
||
669 | // Start + # of Reserved Sectors + (# of Sectors Per FAT * # of FAT Copies) |
||
41 | ingob | 670 | Partition.FirstRootDirSector = Partition.FirstFatSector + (u32)((u32)Partition.SectorsPerFat*(u32)Partition.FatCopies); |
671 | // Calculate the position of the first datacluster: |
||
88 | killagreg | 672 | // Start + # of Reserved + (# of Sectors Per FAT * # of FAT Copies) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
41 | ingob | 673 | Partition.FirstDataSector = Partition.FirstRootDirSector + (u32)(Partition.MaxRootEntries>>4); // assuming 512 Byte Per Sector |
674 | // Calculate the last data sector |
||
675 | if(VBR->NoSectors == 0) |
||
676 | { |
||
110 | killagreg | 677 | UART1_PutString("VBR: Bad number of sectors."); |
41 | ingob | 678 | result = 5; |
88 | killagreg | 679 | goto end; |
41 | ingob | 680 | } |
681 | Partition.LastDataSector = Partition.FirstDataSector + VBR->NoSectors - 1; |
||
682 | // check for FAT16 in VBR of first partition |
||
683 | if(!((VBR->FATName[0]=='F') && (VBR->FATName[1]=='A') && (VBR->FATName[2]=='T') && (VBR->FATName[3]=='1')&&(VBR->FATName[4]=='6'))) |
||
684 | { |
||
110 | killagreg | 685 | UART1_PutString("VBR: Partition ist not FAT16 type."); |
41 | ingob | 686 | result = 6; |
687 | goto end; |
||
688 | } |
||
689 | Partition.IsValid = 1; // mark data in partition structure as valid |
||
379 | holgerb | 690 | Partition.CurrentWorkingDirectory = Partition.FirstRootDirSector; |
691 | strcpy(Partition.PathToCwd,"/"); |
||
41 | ingob | 692 | result = 0; |
693 | end: |
||
694 | if(result != 0) Fat16_Deinit(); |
||
110 | killagreg | 695 | else UART1_PutString("ok"); |
88 | killagreg | 696 | return(result); |
1 | ingob | 697 | } |
698 | |||
699 | |||
41 | ingob | 700 | |
701 | /****************************************************************************************************************************************/ |
||
702 | /* Function: ClearCurrCluster(File_t*); */ |
||
703 | /* */ |
||
704 | /* Description: This function fills the current cluster with 0. */ |
||
705 | /* */ |
||
706 | /* Returnvalue: The function returns 1 on success else 0. */ |
||
707 | /****************************************************************************************************************************************/ |
||
708 | u8 ClearCurrCluster(File_t * file) |
||
1 | ingob | 709 | { |
41 | ingob | 710 | u8 retvalue = 1; |
711 | u32 i; |
||
88 | killagreg | 712 | |
41 | ingob | 713 | if((!Partition.IsValid) || (file == NULL)) return(0); |
714 | |||
715 | for(i = 0; i < BYTES_PER_SECTOR; i++) file->Cache[i] = 0; // clear file cache |
||
211 | killagreg | 716 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return (0); // nothing to do |
41 | ingob | 717 | for(i = 0; i < Partition.SectorsPerCluster; i++) |
1 | ingob | 718 | { |
41 | ingob | 719 | file->SectorInCache = file->FirstSectorOfCurrCluster + i; |
720 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
||
721 | { |
||
88 | killagreg | 722 | Fat16_Deinit(); |
379 | holgerb | 723 | return(0); |
41 | ingob | 724 | } |
1 | ingob | 725 | } |
88 | killagreg | 726 | return(retvalue); |
1 | ingob | 727 | } |
728 | |||
41 | ingob | 729 | /*****************************************************************************************************************************************/ |
730 | /* Function: GetNextCluster(File_t* ); */ |
||
731 | /* */ |
||
732 | /* Description: This function finds the next datacluster of the file specified with File *File. */ |
||
733 | /* */ |
||
734 | /* Returnvalue: The function returns the next cluster or 0 if the last cluster has already reached. */ |
||
735 | /*****************************************************************************************************************************************/ |
||
736 | u16 GetNextCluster(File_t * file) |
||
1 | ingob | 737 | { |
211 | killagreg | 738 | u16 cluster = CLUSTER_UNDEFINED; |
41 | ingob | 739 | u32 fat_byte_offset, sector, byte; |
740 | Fat16Entry_t * fat; |
||
88 | killagreg | 741 | |
41 | ingob | 742 | if((!Partition.IsValid) || (file == NULL)) return(cluster); |
211 | killagreg | 743 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(cluster); |
41 | ingob | 744 | // if sector is within the data area |
745 | if((Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)&& (file->FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
||
1 | ingob | 746 | { |
41 | ingob | 747 | // determine current file cluster |
748 | cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); |
||
749 | // calculate byte offset in the fat for corresponding entry |
||
750 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
||
751 | // calculate the sector that contains the current cluster within the fat |
||
752 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
||
753 | // calculate byte offset of the current cluster within that fat sector |
||
754 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
||
755 | // read this sector to the file cache |
||
756 | if(file->SectorInCache != sector) |
||
1 | ingob | 757 | { |
41 | ingob | 758 | file->SectorInCache = sector; // update sector stored in buffer |
759 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
||
24 | StephanB | 760 | { |
41 | ingob | 761 | Fat16_Deinit(); |
379 | holgerb | 762 | return (CLUSTER_UNDEFINED); |
88 | killagreg | 763 | } |
764 | } |
||
41 | ingob | 765 | // read the next cluster from cache |
766 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
||
767 | cluster = fat->NextCluster; |
||
211 | killagreg | 768 | // if no next cluster exist |
41 | ingob | 769 | if(FAT16_CLUSTER_LAST_MIN <= cluster) |
770 | { |
||
211 | killagreg | 771 | cluster = CLUSTER_UNDEFINED; // next cluster is undefined |
1 | ingob | 772 | } |
24 | StephanB | 773 | else |
774 | { |
||
41 | ingob | 775 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(cluster); |
776 | file->SectorOfCurrCluster = 0; |
||
777 | file->ByteOfCurrSector = 0; |
||
24 | StephanB | 778 | } |
88 | killagreg | 779 | } |
41 | ingob | 780 | return(cluster); |
1 | ingob | 781 | } |
782 | |||
783 | |||
379 | holgerb | 784 | |
41 | ingob | 785 | /****************************************************************************************************************************************/ |
786 | /* Function: FindNextFreeCluster(File_t *); */ |
||
787 | /* */ |
||
788 | /* Description: This function looks in the fat to find the next free cluster */ |
||
789 | /* */ |
||
790 | /* Returnvalue: The function returns the cluster number of the next free cluster found within the fat. */ |
||
791 | /****************************************************************************************************************************************/ |
||
792 | u16 FindNextFreeCluster(File_t *file) |
||
1 | ingob | 793 | { |
41 | ingob | 794 | u32 fat_sector; // current sector within the fat relative to the first sector of the fat. |
795 | u32 curr_sector; // current sector |
||
796 | u16 fat_entry; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
||
211 | killagreg | 797 | u16 free_cluster = CLUSTER_UNDEFINED; // next free cluster number. |
41 | ingob | 798 | Fat16Entry_t * fat; |
88 | killagreg | 799 | |
41 | ingob | 800 | if((!Partition.IsValid) || (file == NULL)) return(0); |
24 | StephanB | 801 | |
41 | ingob | 802 | // start searching for an empty cluster at the beginning of the fat. |
88 | killagreg | 803 | fat_sector = 0; |
804 | do |
||
1 | ingob | 805 | { |
41 | ingob | 806 | curr_sector = Partition.FirstFatSector + fat_sector; // calculate sector to read |
807 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
||
808 | if( SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector of fat from sd-card. |
||
809 | { |
||
810 | Fat16_Deinit(); |
||
379 | holgerb | 811 | return(CLUSTER_UNDEFINED); |
41 | ingob | 812 | } |
813 | |||
814 | fat = (Fat16Entry_t *)file->Cache; // set fat pointer to file cache |
||
815 | |||
88 | killagreg | 816 | for(fat_entry = 0; fat_entry < FAT16_ENTRIES_PER_SECTOR; fat_entry++) // look for an free cluster at all entries in this sector of the fat. |
41 | ingob | 817 | { |
818 | if(fat[fat_entry].NextCluster == FAT16_CLUSTER_FREE) // empty cluster found!! |
||
88 | killagreg | 819 | { |
820 | fat[fat_entry].NextCluster = FAT16_CLUSTER_LAST_MAX; // mark this fat-entry as used |
||
41 | ingob | 821 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // and save the sector at the sd-card. |
822 | { |
||
823 | Fat16_Deinit(); |
||
379 | holgerb | 824 | return(CLUSTER_UNDEFINED); |
41 | ingob | 825 | } |
88 | killagreg | 826 | free_cluster = (u16)(fat_sector * FAT16_ENTRIES_PER_SECTOR + (u32)fat_entry); |
41 | ingob | 827 | fat_entry = FAT16_ENTRIES_PER_SECTOR; // terminate the search for a free cluster in this sector. |
828 | } |
||
829 | } |
||
830 | fat_sector++; // continue the search in next fat sector |
||
88 | killagreg | 831 | // repeat until the end of the fat is reached and no free cluster has been found so far |
368 | holgerb | 832 | }while((fat_sector < Partition.SectorsPerFat) && (!free_cluster)); |
41 | ingob | 833 | return(free_cluster); |
1 | ingob | 834 | } |
835 | |||
836 | |||
41 | ingob | 837 | /****************************************************************************************************************************************************/ |
838 | /* Function: s16 fseek_(File_t *, s32 *, u8) */ |
||
839 | /* */ |
||
840 | /* Description: This function sets the pointer of the stream relative to the position */ |
||
841 | /* specified by origin (SEEK_SET, SEEK_CUR, SEEK_END) */ |
||
380 | holgerb | 842 | /* Returnvalue: Is 0 if seek was successful */ |
41 | ingob | 843 | /****************************************************************************************************************************************************/ |
844 | s16 fseek_(File_t *file, s32 offset, s16 origin) |
||
1 | ingob | 845 | { |
41 | ingob | 846 | s32 fposition = 0; |
847 | s16 retvalue = 1; |
||
88 | killagreg | 848 | |
380 | holgerb | 849 | // the byteindex within a sector |
850 | u32 byte_index = 0; |
||
851 | // the sectorindex within a cluster |
||
852 | u32 sector_index = 0; |
||
853 | // the index of the cluster within the clusterchain inside the fat |
||
854 | u32 cluster_index = 0; |
||
855 | |||
856 | // check if the partition is valid |
||
211 | killagreg | 857 | if((!Partition.IsValid) || (file == NULL)) return(retvalue); |
380 | holgerb | 858 | //...................................................... |
859 | if(origin == SEEK_SET) // Fileposition relative to the beginning of the file. |
||
41 | ingob | 860 | { |
380 | holgerb | 861 | fposition = 0; |
862 | } |
||
863 | //...................................................... |
||
864 | else if(origin == SEEK_END) // Fileposition relative to the end of the file. |
||
865 | { |
||
866 | fposition = (s32) file->Size; |
||
867 | } |
||
868 | //...................................................... |
||
869 | else if(origin == SEEK_CUR) // Fileposition relative to the current position of the file. |
||
870 | { |
||
871 | fposition = (s32)file->Position; |
||
872 | } |
||
41 | ingob | 873 | |
380 | holgerb | 874 | // calculate the specified fileposition according to the selected mode |
875 | fposition += offset; // Die Absolute Dateiposition welche durch fseek angesprungen werden soll. |
||
876 | // is the fileposition within the file? |
||
877 | if((fposition >= 0) && (fposition <= (s32)file->Size)) // Ist die berechnete Dateiposition innerhalb der geöffneten Datei? |
||
1 | ingob | 878 | { |
380 | holgerb | 879 | // initialize the filepointer |
41 | ingob | 880 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
881 | file->SectorOfCurrCluster = 0; |
||
882 | file->ByteOfCurrSector = 0; |
||
883 | file->Position = 0; |
||
380 | holgerb | 884 | // has the specified file at least one valid sector attached? |
211 | killagreg | 885 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(retvalue); |
380 | holgerb | 886 | // calculate the absolute number of the sector wich contains the fileposition we are looking for |
887 | sector_index = (u32) ((u32)fposition >> 9); |
||
888 | // calculate the index of the cluster containing the specified sector |
||
889 | cluster_index = (u32) sector_index / Partition.SectorsPerCluster; |
||
890 | // the absolute sectornumber becomes relative to the beginning of the specified cluster |
||
891 | sector_index = (sector_index % Partition.SectorsPerCluster); |
||
892 | // calculate the index of the byteposition the fileposition points to |
||
893 | byte_index = (u32) fposition % 512; |
||
894 | // parse the fat till the calculated cluster has been reached |
||
895 | while(cluster_index--) GetNextCluster(file); |
||
896 | // set the filepointer to the specified sector and byteposition |
||
897 | file->SectorOfCurrCluster = (u8) sector_index; |
||
898 | file->ByteOfCurrSector = (u16) byte_index; |
||
899 | // the fileposition now equals the filepointer |
||
900 | file->Position = (u32)fposition; |
||
901 | // the specified fileposition has been reached |
||
902 | retvalue = 0; |
||
903 | } |
||
1 | ingob | 904 | return(retvalue); |
905 | } |
||
906 | |||
41 | ingob | 907 | /****************************************************************************************************************************************/ |
908 | /* Function: u16 DeleteClusterChain(File *file); */ |
||
909 | /* */ |
||
910 | /* Description: This function trances along a cluster chain in the fat and frees all clusters visited. */ |
||
911 | /* */ |
||
912 | /****************************************************************************************************************************************/ |
||
913 | u8 DeleteClusterChain(u16 StartCluster) |
||
1 | ingob | 914 | { |
88 | killagreg | 915 | u16 cluster; |
41 | ingob | 916 | u32 fat_byte_offset, sector, byte; |
917 | Fat16Entry_t * fat; |
||
918 | u8 buffer[BYTES_PER_SECTOR]; |
||
919 | u32 sector_in_buffer = 0; |
||
920 | u8 repeat = 0; |
||
921 | |||
211 | killagreg | 922 | if(!Partition.IsValid) return(0); |
923 | if(StartCluster == CLUSTER_UNDEFINED) return(0); |
||
210 | killagreg | 924 | cluster = StartCluster; // init chain trace |
211 | killagreg | 925 | // if start cluster is no real cluster |
926 | if(FAT16_CLUSTER_LAST_MIN <= cluster) return 1; |
||
41 | ingob | 927 | |
928 | // calculate byte offset in the fat for corresponding entry |
||
929 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
||
930 | // calculate the sector that contains the current cluster within the fat |
||
931 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
||
932 | // calculate byte offset of the current cluster within that fat sector |
||
933 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
||
88 | killagreg | 934 | do |
1 | ingob | 935 | { |
41 | ingob | 936 | if(sector != sector_in_buffer) |
1 | ingob | 937 | { |
41 | ingob | 938 | // read this sector to buffer |
939 | sector_in_buffer = sector; |
||
940 | if(SD_SUCCESS != SDC_GetSector(sector_in_buffer, buffer)) return 0; // read sector from sd-card |
||
88 | killagreg | 941 | } |
41 | ingob | 942 | // read the next cluster from cache |
943 | fat = (Fat16Entry_t *)(&(buffer[byte])); |
||
944 | cluster = fat->NextCluster; |
||
211 | killagreg | 945 | fat->NextCluster = FAT16_CLUSTER_FREE; // mark current cluster as free |
946 | |||
947 | if((FAT16_CLUSTER_USED_MIN <= cluster) && (cluster <= FAT16_CLUSTER_USED_MAX) ) |
||
948 | { |
||
949 | repeat = 1; |
||
950 | // calculate sector byte and byte offset in the fat for the next cluster |
||
951 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
||
952 | // calculate the sector that contains the current cluster within the fat |
||
953 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
||
954 | // calculate byte offset of the current cluster within that fat sector |
||
955 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
||
956 | } |
||
41 | ingob | 957 | else repeat = 0; |
958 | |||
959 | // if new sector is not the sector in buffer or the last cluster in the chain was traced |
||
960 | if((sector != sector_in_buffer) || !repeat) |
||
961 | { // write sector in buffer |
||
210 | killagreg | 962 | if(SD_SUCCESS != SDC_PutSector(sector_in_buffer,buffer)) |
146 | killagreg | 963 | { |
964 | Fat16_Deinit(); |
||
211 | killagreg | 965 | return(0); |
146 | killagreg | 966 | } |
1 | ingob | 967 | } |
41 | ingob | 968 | } |
368 | holgerb | 969 | while(repeat); |
41 | ingob | 970 | |
971 | return 1; |
||
1 | ingob | 972 | } |
973 | |||
974 | |||
41 | ingob | 975 | /****************************************************************************************************************************************/ |
976 | /* Function: u16 AppendCluster(File *file); */ |
||
977 | /* */ |
||
978 | /* Description: This function looks in the fat to find the next free cluster and appends it to the file. */ |
||
979 | /* */ |
||
211 | killagreg | 980 | /* Returnvalue: The function returns the appened cluster number or CLUSTER_UNDEFINED of no cluster was appended. */ |
41 | ingob | 981 | /****************************************************************************************************************************************/ |
982 | u16 AppendCluster(File_t *file) |
||
1 | ingob | 983 | { |
211 | killagreg | 984 | u16 last_cluster, new_cluster = CLUSTER_UNDEFINED; |
41 | ingob | 985 | u32 fat_byte_offset, sector, byte; |
986 | Fat16Entry_t * fat; |
||
88 | killagreg | 987 | |
387 | StephanB | 988 | |
41 | ingob | 989 | if((!Partition.IsValid) || (file == NULL)) return(new_cluster); |
1 | ingob | 990 | |
41 | ingob | 991 | new_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
211 | killagreg | 992 | if(new_cluster != CLUSTER_UNDEFINED) |
387 | StephanB | 993 | { // A free cluster was found and can be added to the end of the file. |
994 | // is there at least one cluster appended to the file? |
||
995 | if(file->FirstSectorOfLastCluster == CLUSTER_UNDEFINED) |
||
996 | { |
||
997 | fseek_(file, 0, SEEK_END); // jump to the end of the file |
||
998 | // remember the first sector of the last cluster |
||
999 | file->FirstSectorOfLastCluster = file->FirstSectorOfCurrCluster; |
||
1000 | last_cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); // determine current file cluster |
||
1001 | } |
||
1002 | else |
||
1003 | { |
||
1004 | last_cluster = SectorToFat16Cluster(file->FirstSectorOfLastCluster); // determine current file cluster |
||
1005 | } |
||
1006 | |||
211 | killagreg | 1007 | if(last_cluster != CLUSTER_UNDEFINED) |
41 | ingob | 1008 | { |
211 | killagreg | 1009 | // update FAT entry of last cluster |
1010 | fat_byte_offset = ((u32)last_cluster)<<1; |
||
1011 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
||
1012 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
||
1013 | // read the sector containing the last cluster of the file |
||
1014 | if(file->SectorInCache != sector) |
||
41 | ingob | 1015 | { |
211 | killagreg | 1016 | file->SectorInCache = sector; // update sector stored in buffer |
1017 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
||
1018 | { |
||
1019 | Fat16_Deinit(); |
||
1020 | return(0); |
||
1021 | } |
||
1022 | } |
||
1023 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
||
1024 | fat->NextCluster = new_cluster; // append the free cluster to the end of the file in the FAT. |
||
1025 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // save the modified sector to the FAT. |
||
1026 | { |
||
41 | ingob | 1027 | Fat16_Deinit(); |
211 | killagreg | 1028 | return(0); |
88 | killagreg | 1029 | } |
387 | StephanB | 1030 | // now the new cluster appended to the fat is the last cluster |
1031 | file->FirstSectorOfLastCluster = Fat16ClusterToSector(new_cluster); |
||
88 | killagreg | 1032 | } |
211 | killagreg | 1033 | else // last cluster of the file is undefined |
1034 | { // then the new cluster must be the first one of the file |
||
1035 | // and its cluster number must be set in the direntry |
||
1036 | DirEntry_t * dir; |
||
1037 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
||
1038 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
||
1039 | { |
||
1040 | Fat16_Deinit(); |
||
1041 | return(CLUSTER_UNDEFINED); |
||
1042 | } |
||
1043 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
||
1044 | dir[file->DirectoryIndex].Res1 = 0; |
||
1045 | dir[file->DirectoryIndex].Res2[0] = 0; |
||
1046 | dir[file->DirectoryIndex].Res2[1] = 0; |
||
1047 | dir[file->DirectoryIndex].StartCluster = new_cluster; // update startcluster |
||
1048 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime);// set time |
||
1049 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime);// and date of modification |
||
1050 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
||
1051 | dir[file->DirectoryIndex].Size = 0; |
||
1052 | // write sector containing the direntry |
||
1053 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
||
1054 | { |
||
1055 | Fat16_Deinit(); |
||
1056 | return(CLUSTER_UNDEFINED); |
||
1057 | } |
||
1058 | // update file info |
||
1059 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(new_cluster); |
||
387 | StephanB | 1060 | file->FirstSectorOfLastCluster = file->FirstSectorOfFirstCluster; |
211 | killagreg | 1061 | file->Size = 0; |
1062 | file->Position = 0; |
||
41 | ingob | 1063 | } |
211 | killagreg | 1064 | // update file pointes |
41 | ingob | 1065 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(new_cluster); |
1066 | file->SectorOfCurrCluster = 0; |
||
1067 | file->ByteOfCurrSector = 0; |
||
1068 | } |
||
1069 | return(new_cluster); |
||
1 | ingob | 1070 | } |
1071 | |||
380 | holgerb | 1072 | |
41 | ingob | 1073 | /****************************************************************************************************************************************************/ |
1074 | /* Function: DirectoryEntryExist(s8 *, u8, u8, File_t *) */ |
||
1075 | /* */ |
||
1076 | /* Description: This function searches all possible dir entries until the file or directory is found or the end of the directory is reached */ |
||
1077 | /* */ |
||
1078 | /* Returnvalue: This function returns 1 if the directory entry specified was found. */ |
||
1079 | /****************************************************************************************************************************************************/ |
||
1080 | u8 DirectoryEntryExist(s8 *dirname, u8 attribfilter, u8 attribmask, File_t *file) |
||
1081 | { |
||
1082 | u32 dir_sector, max_dir_sector, curr_sector; |
||
1083 | u16 dir_entry = 0; |
||
24 | StephanB | 1084 | |
41 | ingob | 1085 | u16 end_of_directory_not_reached = 0; |
1086 | u8 i = 0; |
||
1087 | u8 direntry_exist = 0; |
||
1088 | DirEntry_t * dir; |
||
24 | StephanB | 1089 | |
41 | ingob | 1090 | // if incomming pointers are useless return immediatly |
88 | killagreg | 1091 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return(direntry_exist); |
41 | ingob | 1092 | |
88 | killagreg | 1093 | // dir entries can be searched only in filesclusters that have |
1094 | // a corresponding dir entry with adir-flag set in its attribute |
||
41 | ingob | 1095 | // or direct within the root directory area |
211 | killagreg | 1096 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
41 | ingob | 1097 | // no current directory exist therefore assume searching in the root |
211 | killagreg | 1098 | if(file->DirectorySector == SECTOR_UNDEFINED) |
24 | StephanB | 1099 | { |
41 | ingob | 1100 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1101 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
||
1102 | } |
||
1103 | // within the root directory area we can read sectors sequentially until the end of this area |
||
1104 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
||
1105 | { |
||
1106 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
||
1107 | } |
||
88 | killagreg | 1108 | // within the data clusters we can read sectors sequentially only within the cluster |
41 | ingob | 1109 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
1110 | { |
||
1111 | max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
||
1112 | } |
||
1113 | else return (direntry_exist); // bad sector range for directory sector of the file |
||
1114 | // if search area is not defined yet |
||
211 | killagreg | 1115 | if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
41 | ingob | 1116 | { |
1117 | // check if the directory entry of current file is existent and has the dir-flag set |
||
1118 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
||
1119 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
||
24 | StephanB | 1120 | { |
41 | ingob | 1121 | Fat16_Deinit(); |
379 | holgerb | 1122 | return(0); |
24 | StephanB | 1123 | } |
41 | ingob | 1124 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
211 | killagreg | 1125 | switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
24 | StephanB | 1126 | { |
41 | ingob | 1127 | case SLOT_EMPTY: |
1128 | case SLOT_DELETED: |
||
1129 | // the directrory pointer of this file points to a deleted or not existen directory |
||
1130 | // therefore no file or subdirectory can be created |
||
1131 | return (direntry_exist); |
||
1132 | break; |
||
88 | killagreg | 1133 | default: // and is a real directory |
41 | ingob | 1134 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
1135 | { // current file is not a directory therefore no file or subdirectory can be created here |
||
1136 | return (direntry_exist); |
||
1137 | } |
||
1138 | break; |
||
24 | StephanB | 1139 | } |
41 | ingob | 1140 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[file->DirectoryIndex].StartCluster); |
24 | StephanB | 1141 | } |
1142 | |||
41 | ingob | 1143 | // update current file data area position to start of first cluster |
88 | killagreg | 1144 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1145 | file->SectorOfCurrCluster = 0; |
||
41 | ingob | 1146 | file->ByteOfCurrSector = 0; |
24 | StephanB | 1147 | |
41 | ingob | 1148 | do // loop over all data clusters of the current directory entry |
88 | killagreg | 1149 | { |
379 | holgerb | 1150 | dir_sector = 0; |
41 | ingob | 1151 | do // loop over all sectors of a cluster or all sectors of the root directory |
88 | killagreg | 1152 | { |
41 | ingob | 1153 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
1154 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
||
1155 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
||
1156 | { |
||
1157 | Fat16_Deinit(); |
||
379 | holgerb | 1158 | return(0); |
41 | ingob | 1159 | } |
1160 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
||
1161 | // search all directory entries within that sector |
||
1162 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
||
1163 | { // check for existing dir entry |
||
1164 | switch((u8)dir[dir_entry].Name[0]) |
||
1165 | { |
||
1166 | case SLOT_EMPTY: |
||
1167 | case SLOT_DELETED: |
||
1168 | // ignore empty or deleted dir entries |
||
1169 | break; |
||
1170 | default: |
||
1171 | // if existing check attributes before names are compared will safe performance |
||
1172 | if ((dir[dir_entry].Attribute & attribmask) != attribfilter) break; // attribute must match |
||
1173 | // then compare the name to the giveb dirname (first 11 characters include 8 chars of basename and 3 chars extension.) |
||
1174 | i = 0; |
||
1175 | while((i < 11) && (dir[dir_entry].Name[i] == dirname[i])) i++; |
||
1176 | if (i < 10) break; // names does not match |
||
1177 | // if dirname and attribute have matched |
||
1178 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
||
88 | killagreg | 1179 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
41 | ingob | 1180 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1181 | file->SectorOfCurrCluster = 0; |
||
1182 | file->ByteOfCurrSector = 0; |
||
1183 | file->DirectorySector = curr_sector; // current sector |
||
1184 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
||
88 | killagreg | 1185 | file->Size = dir[dir_entry].Size; |
1186 | direntry_exist = 1; // mark as found |
||
1187 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
||
41 | ingob | 1188 | } // end of first byte of name check |
1189 | } |
||
1190 | dir_sector++; // search next sector |
||
1191 | // stop if we reached the end of the cluster or the end of the root dir |
||
368 | holgerb | 1192 | }while((dir_sector < max_dir_sector) && (!direntry_exist)); |
1 | ingob | 1193 | |
41 | ingob | 1194 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
88 | killagreg | 1195 | if(!direntry_exist && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
41 | ingob | 1196 | { |
1197 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
||
1198 | } |
||
368 | holgerb | 1199 | }while((end_of_directory_not_reached) && (!direntry_exist)); // repeat until a next cluster exist an no |
41 | ingob | 1200 | return(direntry_exist); |
1 | ingob | 1201 | } |
1202 | |||
1203 | |||
41 | ingob | 1204 | /****************************************************************************************************************************************/ |
1205 | /* Function: CreateDirectoryEntry(s8 *, u16, File_t *) */ |
||
1206 | /* */ |
||
1207 | /* Description: This function looks for the next free position in the directory and creates an entry. */ |
||
1208 | /* The type of an directory entry is specified by the file attribute. */ |
||
1209 | /* */ |
||
1210 | /* Returnvalue: Return 0 on error */ |
||
1211 | /****************************************************************************************************************************************/ |
||
1212 | u8 CreateDirectoryEntry(s8 *dirname, u8 attrib, File_t *file) |
||
1 | ingob | 1213 | { |
41 | ingob | 1214 | u32 dir_sector, max_dir_sector, curr_sector; |
1215 | u16 dir_entry = 0; |
||
1216 | u16 subdircluster, dircluster = 0; |
||
1217 | u16 end_of_directory_not_reached = 0; |
||
1218 | u8 i = 0; |
||
88 | killagreg | 1219 | u8 retvalue = 0; |
41 | ingob | 1220 | DirEntry_t *dir; |
1221 | |||
1222 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return (retvalue); |
||
1223 | // It is not checked here that the dir entry that should be created is already existent! |
||
88 | killagreg | 1224 | |
1225 | // Dir entries can be created only in file-clusters that have |
||
41 | ingob | 1226 | // the dir-flag set in its attribute or within the root directory |
88 | killagreg | 1227 | |
211 | killagreg | 1228 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
41 | ingob | 1229 | // no current directory exist therefore assume creating in the root |
211 | killagreg | 1230 | if(file->DirectorySector == SECTOR_UNDEFINED) |
24 | StephanB | 1231 | { |
41 | ingob | 1232 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1233 | dircluster = 0; |
||
1234 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
||
1235 | } |
||
1236 | // within the root directory area we can read sectors sequentially until the end of this area |
||
1237 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
||
1238 | { |
||
1239 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
||
1240 | } |
||
88 | killagreg | 1241 | // within the data clusters we can read sectors sequentially only within the cluster |
41 | ingob | 1242 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
1243 | { |
||
1244 | max_dir_sector = Partition.SectorsPerCluster; |
||
1245 | } |
||
88 | killagreg | 1246 | else return (retvalue); // bad sector range for directory sector of the file |
41 | ingob | 1247 | // if search area is not defined yet |
211 | killagreg | 1248 | if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
41 | ingob | 1249 | { |
1250 | // check if the directory entry of current file is existent and has the dir-flag set |
||
1251 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
||
88 | killagreg | 1252 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
41 | ingob | 1253 | { |
1254 | Fat16_Deinit(); |
||
379 | holgerb | 1255 | return(0); |
88 | killagreg | 1256 | } |
41 | ingob | 1257 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
218 | killagreg | 1258 | switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
41 | ingob | 1259 | { |
1260 | case SLOT_EMPTY: |
||
1261 | case SLOT_DELETED: |
||
1262 | return (retvalue); |
||
1263 | break; |
||
88 | killagreg | 1264 | default: // and is a real directory |
41 | ingob | 1265 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
1266 | { // current file is not a directory therefore no file or subdirectory can be created here |
||
1267 | return (retvalue); |
||
1268 | } |
||
1269 | break; |
||
1270 | } |
||
1271 | dircluster = dir[file->DirectoryIndex].StartCluster; |
||
88 | killagreg | 1272 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dircluster); |
41 | ingob | 1273 | } |
88 | killagreg | 1274 | |
218 | killagreg | 1275 | // if the new direntry is a subdirectory |
1276 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) |
||
1277 | { // get a free clutser for its content |
||
1278 | subdircluster = FindNextFreeCluster(file); // get the next free cluster on the disk and mark it as used. |
||
1279 | } |
||
1280 | else // a normal file |
||
1281 | { // has no data cluster after creation |
||
1282 | subdircluster = CLUSTER_UNDEFINED; |
||
1283 | } |
||
1284 | |||
211 | killagreg | 1285 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1286 | file->SectorOfCurrCluster = 0; |
||
1287 | do // loop over all clusters of current directory |
||
41 | ingob | 1288 | { |
211 | killagreg | 1289 | dir_sector = 0; // reset sector counter within a new cluster |
1290 | do // loop over all sectors of a cluster or all sectors of the root directory |
||
88 | killagreg | 1291 | { |
211 | killagreg | 1292 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
1293 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
||
1294 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
||
1 | ingob | 1295 | { |
211 | killagreg | 1296 | Fat16_Deinit(); |
379 | holgerb | 1297 | return(0); |
211 | killagreg | 1298 | } |
1299 | |||
1300 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
||
1301 | // search all directory entries of a sector |
||
1302 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
||
1303 | { // check if current direntry is available |
||
1304 | if(((u8)dir[dir_entry].Name[0] == SLOT_EMPTY) || ((u8)dir[dir_entry].Name[0] == SLOT_DELETED)) |
||
1305 | { // a free direntry was found |
||
1306 | for(i = 0; i < 11; i++) dir[dir_entry].Name[i] = dirname[i]; // Set dir name |
||
1307 | dir[dir_entry].Attribute = attrib; |
||
1308 | dir[dir_entry].Res1 = 0; |
||
1309 | dir[dir_entry].CreationTime10ms = (u8)(SystemTime.mSec/10); |
||
1310 | dir[dir_entry].CreationTime = FileTime(&SystemTime); |
||
1311 | dir[dir_entry].CreationDate = FileDate(&SystemTime); |
||
1312 | dir[dir_entry].LastAccessDate = dir[dir_entry].CreationDate; |
||
1313 | dir[dir_entry].Res2[0] = 0; |
||
1314 | dir[dir_entry].Res2[1] = 0; |
||
1315 | dir[dir_entry].ModTime = dir[dir_entry].CreationTime; |
||
1316 | dir[dir_entry].ModDate = dir[dir_entry].CreationDate; |
||
1317 | // Set the attribute of the new directoryentry. |
||
1318 | dir[dir_entry].StartCluster = subdircluster; // copy the location of the first datacluster to the directoryentry. |
||
1319 | dir[dir_entry].Size = 0; // the new createted file has no content yet. |
||
1320 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to card |
||
1321 | { |
||
1322 | Fat16_Deinit(); |
||
379 | holgerb | 1323 | return(0); |
211 | killagreg | 1324 | } |
218 | killagreg | 1325 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(subdircluster); // Calculate absolute sectorposition of first datacluster. |
211 | killagreg | 1326 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; // Start reading the file with the first sector of the first datacluster. |
1327 | file->SectorOfCurrCluster = 0; // reset sector of cureen cluster |
||
1328 | file->ByteOfCurrSector = 0; // reset the byte location within the current sector |
||
1329 | file->Attribute = attrib; // set file attribute to dir attribute |
||
1330 | file->Size = 0; // new file has no size |
||
1331 | file->DirectorySector = curr_sector; |
||
1332 | file->DirectoryIndex = dir_entry; |
||
1333 | // prepare subdirectory data cluster |
||
1334 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) // if a new directory was created then initilize the data area |
||
1335 | { |
||
1336 | ClearCurrCluster(file); // fill cluster with zeros |
||
1337 | file->SectorInCache = file->FirstSectorOfFirstCluster; |
||
1338 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
||
41 | ingob | 1339 | { |
211 | killagreg | 1340 | Fat16_Deinit(); |
379 | holgerb | 1341 | return(0); |
41 | ingob | 1342 | } |
211 | killagreg | 1343 | dir = (DirEntry_t *)file->Cache; |
1344 | // create direntry "." to current dir |
||
1345 | dir[0].Name[0] = 0x2E; |
||
1346 | for(i = 1; i < 11; i++) dir[0].Name[i] = ' '; |
||
1347 | dir[0].Attribute = ATTR_SUBDIRECTORY; |
||
1348 | dir[0].StartCluster = subdircluster; |
||
1349 | dir[0].Size = 0; |
||
1350 | // create direntry ".." to the upper dir |
||
1351 | dir[1].Name[0] = 0x2E; |
||
1352 | dir[1].Name[1] = 0x2E; |
||
1353 | for(i = 2; i < 11; i++) dir[1].Name[i] = ' '; |
||
1354 | dir[1].Attribute = ATTR_SUBDIRECTORY; |
||
1355 | dir[1].StartCluster = dircluster; |
||
1356 | dir[1].Size = 0; |
||
1357 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// read in the sector. |
||
88 | killagreg | 1358 | { |
211 | killagreg | 1359 | Fat16_Deinit(); |
379 | holgerb | 1360 | return(0); |
211 | killagreg | 1361 | } |
1362 | } |
||
1363 | retvalue = 1; |
||
1364 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
||
88 | killagreg | 1365 | } |
211 | killagreg | 1366 | } |
1367 | dir_sector++; // search next sector |
||
1368 | // stop if we reached the end of the cluster or the end of the root dir |
||
368 | holgerb | 1369 | }while((dir_sector < max_dir_sector) && (!retvalue)); |
88 | killagreg | 1370 | |
211 | killagreg | 1371 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
1372 | if(!retvalue && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
||
1373 | { |
||
1374 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
||
1375 | } |
||
368 | holgerb | 1376 | }while((end_of_directory_not_reached) && (!retvalue)); |
211 | killagreg | 1377 | // Perhaps we are at the end of the last cluster of a directory file and have no free direntry found. |
1378 | // Then we would need to add a cluster to that file and create the new direntry there. |
||
1379 | // This code is not implemented yet, because its occurs only if more that 32*32=1024 direntries are |
||
1380 | // within a subdirectory of root. |
||
1381 | |||
41 | ingob | 1382 | return(retvalue); // return 1 if file has been created otherwise return 0. |
1 | ingob | 1383 | } |
1384 | |||
41 | ingob | 1385 | /********************************************************************************************************************************************/ |
1386 | /* Function: FileExist(const s8* filename, u8 attribfilter, u8 attribmask, File_t *file); */ |
||
1387 | /* */ |
||
1388 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
||
1389 | /* in the rootdirectory of the drive. If the file is found the Filepointer properties are */ |
||
1390 | /* updated. */ |
||
1391 | /* */ |
||
1392 | /* Returnvalue: 1 if file is found else 0. */ |
||
1393 | /********************************************************************************************************************************************/ |
||
1394 | u8 FileExist(const s8* filename, const u8 attribfilter, const u8 attribmask, File_t *file) |
||
1 | ingob | 1395 | { |
41 | ingob | 1396 | s8* path = 0; |
1397 | s8* subpath = 0; |
||
1398 | u8 af, am, file_exist = 0; |
||
1399 | s8 dirname[12]; // 8+3 + temination character |
||
1 | ingob | 1400 | |
41 | ingob | 1401 | // if incomming pointers are useless return immediatly |
1402 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
||
1 | ingob | 1403 | |
41 | ingob | 1404 | // trace along the filepath |
1405 | path = (s8*)filename; // start a the beginning of the filename string |
||
1406 | file->DirectorySector = 0; // start at RootDirectory with file search |
||
88 | killagreg | 1407 | file->DirectoryIndex = 0; |
379 | holgerb | 1408 | /* if a path begins with a '/' at index 0 the search starts at the rootdirectory otherwise we will start relative to the cwd */ |
1409 | if(path[0] != '/') |
||
1410 | { |
||
1411 | /* is the current working directory the rootdirectory? */ |
||
1412 | if(Partition.CurrentWorkingDirectory == Partition.FirstRootDirSector) file->DirectorySector = 0; |
||
1413 | /* otherwise we are working in an subdirectory */ |
||
1414 | else file->DirectorySector = Partition.CurrentWorkingDirectory; |
||
1415 | } |
||
41 | ingob | 1416 | // as long as the file was not found and the remaining path is not empty |
368 | holgerb | 1417 | while((*path != 0) && !file_exist) |
41 | ingob | 1418 | { // separate dirname and subpath from filepath string |
1419 | subpath = SeperateDirName(path, dirname); |
||
1420 | if(subpath != NULL) |
||
88 | killagreg | 1421 | { |
1422 | if(*subpath == 0) |
||
41 | ingob | 1423 | { // empty subpath indicates last element of dir chain |
1424 | af = attribfilter; |
||
1425 | am = attribmask; |
||
1426 | } |
||
1427 | else // it must be a subdirectory and no volume label |
||
1 | ingob | 1428 | { |
41 | ingob | 1429 | af = ATTR_SUBDIRECTORY; |
1430 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
||
1431 | } |
||
1432 | if(!DirectoryEntryExist(dirname, af, am, file)) |
||
1433 | { |
||
1434 | return (file_exist); // subdirectory does not exist |
||
1435 | } |
||
88 | killagreg | 1436 | else |
1437 | { |
||
41 | ingob | 1438 | if (*subpath == 0) |
24 | StephanB | 1439 | { |
41 | ingob | 1440 | file_exist = 1; // last element of path chain was found with the given attribute filter |
24 | StephanB | 1441 | } |
1 | ingob | 1442 | } |
1443 | } |
||
41 | ingob | 1444 | else // error seperating the subpath |
1 | ingob | 1445 | { |
41 | ingob | 1446 | return file_exist; // bad subdir format |
1 | ingob | 1447 | } |
41 | ingob | 1448 | path = subpath; |
1449 | subpath = 0; |
||
1 | ingob | 1450 | } |
41 | ingob | 1451 | return (file_exist); |
1 | ingob | 1452 | } |
1453 | |||
24 | StephanB | 1454 | |
41 | ingob | 1455 | /********************************************************************************************************************************************/ |
1456 | /* Function: FileCreate(const s8* filename, u8 attrib, File_t *file); */ |
||
1457 | /* */ |
||
1458 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
||
1459 | /* in the rootdirectory of the partition. If the file is found the Filepointer properties are */ |
||
88 | killagreg | 1460 | /* updated. If file or its subdirectories are not found they will be created */ |
41 | ingob | 1461 | /* */ |
1462 | /* Returnvalue: 1 if file was created else 0. */ |
||
1463 | /********************************************************************************************************************************************/ |
||
1464 | u8 FileCreate(const s8* filename, const u8 attrib, File_t *file) |
||
1465 | { |
||
1466 | s8 *path = 0; |
||
1467 | s8 *subpath = 0; |
||
1468 | u8 af, am, file_created = 0; |
||
1469 | s8 dirname[12]; |
||
24 | StephanB | 1470 | |
41 | ingob | 1471 | // if incomming pointers are useless return immediatly |
1472 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
||
1 | ingob | 1473 | |
41 | ingob | 1474 | // trace along the filepath |
1475 | path = (s8*)filename; // start a the beginning of the filename string |
||
1476 | file->DirectorySector = 0; // start at RootDirectory with file search |
||
1477 | file->DirectoryIndex = 0; |
||
1478 | // as long as the file was not created and the remaining file path is not empty |
||
368 | holgerb | 1479 | while((*path != 0) && !file_created) |
41 | ingob | 1480 | { // separate dirname and subpath from filepath string |
1481 | subpath = SeperateDirName(path, dirname); |
||
1482 | if(subpath != NULL) |
||
24 | StephanB | 1483 | { |
88 | killagreg | 1484 | if(*subpath == 0) |
41 | ingob | 1485 | { // empty subpath indicates last element of dir chain |
1486 | af = ATTR_NONE; |
||
1487 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; // any file that is no subdir or volume label |
||
24 | StephanB | 1488 | } |
41 | ingob | 1489 | else // it must be a subdirectory and no volume label |
24 | StephanB | 1490 | { |
41 | ingob | 1491 | af = ATTR_SUBDIRECTORY; |
1492 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
||
24 | StephanB | 1493 | } |
41 | ingob | 1494 | if(!DirectoryEntryExist(dirname, af, am, file)) // if subdir or file is not existent |
1495 | { // try to create subdir or file |
||
1496 | if(*subpath == 0) af = attrib; // if last element in dir chain take the given attribute |
||
1497 | if(!CreateDirectoryEntry(dirname, af, file)) |
||
1498 | { // could not be created |
||
88 | killagreg | 1499 | return(file_created); |
1500 | } |
||
41 | ingob | 1501 | else if (*subpath == 0) file_created = 1; // last element of path chain was created |
24 | StephanB | 1502 | } |
1503 | } |
||
41 | ingob | 1504 | else // error seperating the subpath |
24 | StephanB | 1505 | { |
41 | ingob | 1506 | return file_created; // bad subdir format |
24 | StephanB | 1507 | } |
41 | ingob | 1508 | path = subpath; |
1509 | subpath = 0; |
||
1510 | } |
||
1511 | return (file_created); |
||
24 | StephanB | 1512 | } |
1 | ingob | 1513 | |
24 | StephanB | 1514 | |
41 | ingob | 1515 | /********************************************************************************************************************************************/ |
1516 | /* Function: File_t * fopen_(s8* filename, s8 mode); */ |
||
1517 | /* */ |
||
1518 | /* Description: This function looks for the specified file in the rootdirectory of the drive. If the file is found the number of the */ |
||
1519 | /* corrosponding filepointer is returned. Only modes 'r' (reading) and 'a' append are implemented yet. */ |
||
1520 | /* */ |
||
1521 | /* Returnvalue: The filepointer to the file or 0 if faild. */ |
||
1522 | /********************************************************************************************************************************************/ |
||
89 | killagreg | 1523 | File_t * fopen_(s8 * const filename, const s8 mode) |
88 | killagreg | 1524 | { |
41 | ingob | 1525 | File_t *file = 0; |
379 | holgerb | 1526 | s8 *cptr; |
88 | killagreg | 1527 | |
41 | ingob | 1528 | if((!Partition.IsValid) || (filename == 0)) return(file); |
1529 | |||
1530 | // Look for an unused filepointer in the file pointer list? |
||
1531 | file = LockFilePointer(); |
||
1532 | // if no unused file pointer was found return 0 |
||
1533 | if(file == NULL) return(file); |
||
1534 | |||
1535 | // now we have found a free filepointer and claimed it |
||
1536 | // so let initiate its property values |
||
211 | killagreg | 1537 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
1538 | file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
||
41 | ingob | 1539 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
1540 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
||
1541 | file->Mode = mode; // mode of fileoperation (read,write) |
||
1542 | file->Size = 0; // the size of the opened file in bytes. |
||
1543 | file->Position = 0; // pointer to a byte within the file 0 < fileposition < filesize |
||
211 | killagreg | 1544 | file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
1545 | file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
||
41 | ingob | 1546 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
1547 | file->Attribute = 0; // the attribute of the file opened. |
||
1548 | |||
379 | holgerb | 1549 | // bring the path into the correct syntax |
1550 | cptr = filename; |
||
1551 | // search the whole string |
||
1552 | while(*cptr != 0) |
||
1553 | { |
||
1554 | // replace all '\' by '/' |
||
1555 | if(*cptr == '\\') *cptr = '/'; |
||
1556 | cptr++; |
||
1557 | } |
||
41 | ingob | 1558 | // check if a real file (no directory) to the given filename exist |
88 | killagreg | 1559 | if(FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file)) |
41 | ingob | 1560 | { // file exist |
1561 | switch(mode) // check mode |
||
1 | ingob | 1562 | { |
41 | ingob | 1563 | case 'a': // if mode is: append to file |
1564 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
||
1565 | { // file is marked as readonly --> do not open this file |
||
1566 | fclose_(file); |
||
1567 | file = NULL; |
||
1568 | } |
||
1569 | else |
||
1570 | { // file is not marked as read only --> goto end of file |
||
1571 | fseek_(file, 0, SEEK_END); // point to the end of the file |
||
1572 | } |
||
1573 | break; |
||
1574 | case 'w': // if mode is: write to file |
||
1575 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
||
1576 | { // file is marked as readonly --> do not open this file |
||
1577 | fclose_(file); |
||
1578 | file = NULL; |
||
1579 | } |
||
1580 | else |
||
211 | killagreg | 1581 | { // file is not marked as read only |
1582 | DirEntry_t * dir; |
||
41 | ingob | 1583 | // free all clusters of that file |
1584 | DeleteClusterChain(SectorToFat16Cluster(file->FirstSectorOfFirstCluster)); |
||
211 | killagreg | 1585 | // update directory entry of that file |
1586 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
||
1587 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
||
1588 | { |
||
1589 | Fat16_Deinit(); |
||
1590 | return(NULL); |
||
1591 | } |
||
1592 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
||
1593 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); // set modification time |
||
1594 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); // set modification date |
||
1595 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
||
1596 | dir[file->DirectoryIndex].StartCluster = CLUSTER_UNDEFINED; // update startcluster |
||
1597 | dir[file->DirectoryIndex].Size = 0; |
||
1598 | // write sector containing the direntry |
||
1599 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
||
1600 | { |
||
1601 | Fat16_Deinit(); |
||
1602 | return(NULL); |
||
1603 | } |
||
1604 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
||
41 | ingob | 1605 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1606 | file->SectorOfCurrCluster = 0; |
||
1607 | file->ByteOfCurrSector = 0; |
||
1608 | file->Size = 0; |
||
1609 | file->Position = 0; |
||
1610 | fseek_(file, 0, SEEK_SET); |
||
1611 | } |
||
1612 | break; |
||
1613 | case 'r': // if mode is: read from file |
||
88 | killagreg | 1614 | // goto end of file |
41 | ingob | 1615 | fseek_(file, 0, SEEK_SET); |
1616 | break; |
||
1617 | default: // other modes are not supported |
||
1618 | fclose_(file); |
||
1619 | file = NULL; |
||
24 | StephanB | 1620 | break; |
1 | ingob | 1621 | } |
88 | killagreg | 1622 | return(file); |
1 | ingob | 1623 | } |
41 | ingob | 1624 | else // file does not exist |
1625 | { |
||
1626 | switch(mode) // check mode |
||
1627 | { |
||
1628 | case 'a': |
||
1629 | case 'w': // if mode is write or append |
||
1630 | // try to create the file |
||
1631 | if(!FileCreate(filename, ATTR_ARCHIVE, file)) |
||
1632 | { // if it could not be created |
||
1633 | fclose_(file); |
||
1634 | file = NULL; |
||
379 | holgerb | 1635 | } |
41 | ingob | 1636 | break; |
1637 | case 'r': // else opened for 'r' |
||
218 | killagreg | 1638 | default: // if unsupported mode |
41 | ingob | 1639 | fclose_(file); |
1640 | file = NULL; |
||
88 | killagreg | 1641 | break; |
41 | ingob | 1642 | } |
88 | killagreg | 1643 | return(file); |
41 | ingob | 1644 | } |
1645 | // we should never come to this point |
||
1646 | fclose_(file); |
||
1647 | file = NULL; |
||
24 | StephanB | 1648 | return(file); |
1649 | } |
||
1650 | |||
41 | ingob | 1651 | /****************************************************************************************************************************************************/ |
1652 | /* Function: fflush_(File *); */ |
||
1653 | /* */ |
||
1654 | /* Description: This function writes the data already in the buffer but not yet written to the file. */ |
||
1655 | /* */ |
||
1656 | /* Returnvalue: 0 on success EOF on error */ |
||
1657 | /****************************************************************************************************************************************************/ |
||
1658 | s16 fflush_(File_t *file) |
||
24 | StephanB | 1659 | { |
88 | killagreg | 1660 | DirEntry_t *dir; |
1661 | |||
41 | ingob | 1662 | if((file == NULL) || (!Partition.IsValid)) return (EOF); |
88 | killagreg | 1663 | |
41 | ingob | 1664 | switch(file->Mode) |
24 | StephanB | 1665 | { |
41 | ingob | 1666 | case 'a': |
1667 | case 'w': |
||
88 | killagreg | 1668 | if(file->ByteOfCurrSector > 0) // has data been added to the file? |
41 | ingob | 1669 | { |
88 | killagreg | 1670 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// save the data still in the buffer |
41 | ingob | 1671 | { |
88 | killagreg | 1672 | Fat16_Deinit(); |
1673 | return(EOF); |
||
1674 | } |
||
41 | ingob | 1675 | } |
1676 | file->SectorInCache = file->DirectorySector; |
||
1677 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read the directory entry for this file. |
||
1678 | { |
||
1679 | Fat16_Deinit(); |
||
88 | killagreg | 1680 | return(EOF); |
41 | ingob | 1681 | } |
88 | killagreg | 1682 | |
41 | ingob | 1683 | dir = (DirEntry_t *)file->Cache; |
324 | killagreg | 1684 | // update file size and modification time & date |
211 | killagreg | 1685 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); |
1686 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); |
||
1687 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
||
41 | ingob | 1688 | dir[file->DirectoryIndex].Size = file->Size; // update file size |
1689 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to sd-card |
||
1690 | { |
||
1691 | Fat16_Deinit(); |
||
1692 | return(EOF); |
||
1693 | } |
||
1694 | break; |
||
1695 | case 'r': |
||
1696 | default: |
||
211 | killagreg | 1697 | // do nothing! |
41 | ingob | 1698 | return(EOF); |
1699 | break; |
||
1700 | |||
24 | StephanB | 1701 | } |
41 | ingob | 1702 | return(0); |
24 | StephanB | 1703 | } |
1 | ingob | 1704 | |
41 | ingob | 1705 | /****************************************************************************************************************************************/ |
1706 | /* Function: fclose_(File *file); */ |
||
1707 | /* */ |
||
1708 | /* Description: This function closes the open file by writing the remaining data */ |
||
1709 | /* from the buffer to the device and entering the filesize in the directory entry. */ |
||
1710 | /* */ |
||
1711 | /* Returnvalue: 0 on success EOF on error */ |
||
1712 | /****************************************************************************************************************************************/ |
||
1713 | s16 fclose_(File_t *file) |
||
24 | StephanB | 1714 | { |
41 | ingob | 1715 | s16 returnvalue = EOF; |
24 | StephanB | 1716 | |
41 | ingob | 1717 | if(file == NULL) return(returnvalue); |
1718 | returnvalue = fflush_(file); |
||
1719 | UnlockFilePointer(file); |
||
1720 | return(returnvalue); |
||
24 | StephanB | 1721 | } |
1722 | |||
41 | ingob | 1723 | /********************************************************************************************************************************************/ |
1724 | /* Function: fgetc_(File *file); */ |
||
1725 | /* */ |
||
1726 | /* Description: This function reads and returns one character from the specified file. Is the end of the actual sector reached the */ |
||
1727 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
||
1728 | /* */ |
||
1729 | /* Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. */ |
||
1730 | /********************************************************************************************************************************************/ |
||
1731 | s16 fgetc_(File_t *file) |
||
88 | killagreg | 1732 | { |
41 | ingob | 1733 | s16 c = EOF; |
1734 | u32 curr_sector; |
||
88 | killagreg | 1735 | |
41 | ingob | 1736 | if( (!Partition.IsValid) || (file == NULL)) return(c); |
1737 | // if the end of the file is not reached, get the next character. |
||
379 | holgerb | 1738 | if((0 < file->Size) && ((file->Position) < file->Size) ) |
1 | ingob | 1739 | { |
41 | ingob | 1740 | curr_sector = file->FirstSectorOfCurrCluster; // calculate the sector of the next character to be read. |
88 | killagreg | 1741 | curr_sector += file->SectorOfCurrCluster; |
1742 | |||
41 | ingob | 1743 | if(file->SectorInCache != curr_sector) |
1 | ingob | 1744 | { |
41 | ingob | 1745 | file->SectorInCache = curr_sector; |
1746 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache,file->Cache)) |
||
1747 | { |
||
1748 | Fat16_Deinit(); |
||
379 | holgerb | 1749 | return(EOF); |
88 | killagreg | 1750 | } |
1751 | } |
||
41 | ingob | 1752 | c = (s16) file->Cache[file->ByteOfCurrSector]; |
1753 | file->Position++; // increment file position |
||
88 | killagreg | 1754 | file->ByteOfCurrSector++; // goto next byte in sector |
41 | ingob | 1755 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if end of sector |
24 | StephanB | 1756 | { |
41 | ingob | 1757 | file->ByteOfCurrSector = 0; // reset byte location |
1758 | file->SectorOfCurrCluster++; // next sector |
||
1759 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
||
24 | StephanB | 1760 | { |
88 | killagreg | 1761 | |
41 | ingob | 1762 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
24 | StephanB | 1763 | { |
41 | ingob | 1764 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
1765 | } |
||
1766 | else // the last cluster was allready reached |
||
1767 | { |
||
1768 | file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
||
1769 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
||
1770 | } |
||
1 | ingob | 1771 | } |
24 | StephanB | 1772 | } |
1773 | } |
||
41 | ingob | 1774 | return(c); |
24 | StephanB | 1775 | } |
1776 | |||
41 | ingob | 1777 | /********************************************************************************************************************************************/ |
1778 | /* Function: fputc_( const s8 c, File *file); */ |
||
1779 | /* */ |
||
1780 | /* Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. */ |
||
1781 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
||
1782 | /* */ |
||
1783 | /* Returnvalue: The function returns the character written to the stream or EOF on error. */ |
||
1784 | /********************************************************************************************************************************************/ |
||
1785 | s16 fputc_(const s8 c, File_t *file) |
||
88 | killagreg | 1786 | { |
41 | ingob | 1787 | u32 curr_sector = 0; |
88 | killagreg | 1788 | |
41 | ingob | 1789 | if((!Partition.IsValid) || (file == NULL)) return(EOF); |
211 | killagreg | 1790 | switch(file->Mode) |
41 | ingob | 1791 | { |
211 | killagreg | 1792 | case 'w': |
1793 | case 'a': |
||
1794 | // If file position equals to file size, then the end of file has been reached. |
||
1795 | // In this case it has to be checked that the ByteOfCurrSector is BYTES_PER_SECTOR |
||
1796 | // and a new cluster should be appended. |
||
1797 | // If the first sector of first cluster is unvalid, then the file claims no data clusters |
||
1798 | // and size should be zero, therefore append a new Cluster too. |
||
1799 | if(((file->Position >= file->Size) && (file->ByteOfCurrSector >= BYTES_PER_SECTOR)) || (file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED)) |
||
1800 | { |
||
1801 | if(CLUSTER_UNDEFINED == AppendCluster(file)) return(EOF); |
||
1802 | } |
||
1803 | |||
1804 | curr_sector = file->FirstSectorOfCurrCluster; |
||
1805 | curr_sector += file->SectorOfCurrCluster; |
||
1806 | if(file->SectorInCache != curr_sector) |
||
1807 | { |
||
1808 | file->SectorInCache = curr_sector; |
||
1809 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) |
||
24 | StephanB | 1810 | { |
211 | killagreg | 1811 | Fat16_Deinit(); |
1812 | return(EOF); |
||
24 | StephanB | 1813 | } |
1 | ingob | 1814 | } |
379 | holgerb | 1815 | |
1816 | file->Cache[file->ByteOfCurrSector] = (u8)c; // write databyte into the buffer. The byte will be written to the device at once |
||
211 | killagreg | 1817 | if(file->Size == file->Position) file->Size++; // a character has been written to the file so the size is incremented only when the character has been added at the end of the file. |
1818 | file->Position++; // the actual positon within the file. |
||
1819 | file->ByteOfCurrSector++; // goto next byte in sector |
||
1820 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if the end of this sector is reached yet |
||
1821 | { // save the sector to the sd-card |
||
383 | holgerb | 1822 | |
211 | killagreg | 1823 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
1824 | { |
||
1825 | Fat16_Deinit(); |
||
1826 | return(EOF); |
||
1827 | } |
||
1828 | file->ByteOfCurrSector = 0; // reset byte location |
||
1829 | file->SectorOfCurrCluster++; // next sector |
||
1830 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster)// if end of cluster is reached, the next datacluster has to be searched in the FAT. |
||
1831 | { |
||
1832 | if(!GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
||
1833 | { // if current cluster was the last cluster of the file |
||
1834 | if(!AppendCluster(file)) // append a new and free cluster at the end of the file. |
||
1835 | { |
||
1836 | file->SectorOfCurrCluster--; // jump back to last sector of last cluster |
||
1837 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set byte location to 1 byte over sector len |
||
1838 | return(EOF); |
||
1839 | } |
||
1840 | } |
||
1841 | else // next cluster |
||
1842 | { |
||
1843 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
||
1844 | } |
||
1845 | } |
||
88 | killagreg | 1846 | } |
211 | killagreg | 1847 | break; |
1848 | case 'r': |
||
1849 | default: |
||
1850 | return(EOF); |
||
1851 | break; |
||
1852 | } // EOF switch(file->Mode) |
||
41 | ingob | 1853 | return(0); |
24 | StephanB | 1854 | } |
1855 | |||
1856 | |||
41 | ingob | 1857 | /****************************************************************************************************************************************/ |
1858 | /* Function: fread_(void *buffer, s32 size, s32 count, File *File); */ |
||
1859 | /* */ |
||
1860 | /* Description: This function reads count objects of the specified size */ |
||
1861 | /* from the actual position of the file to the specified buffer. */ |
||
1862 | /* */ |
||
1863 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
||
1864 | /****************************************************************************************************************************************/ |
||
1865 | u32 fread_(void *buffer, u32 size, u32 count, File_t *file) |
||
1866 | { |
||
1867 | u32 object_cnt = 0; // count the number of objects read from the file. |
||
1868 | u32 object_size = 0; // count the number of bytes read from the actual object. |
||
1869 | u8 *pbuff = 0; // a pointer to the actual bufferposition. |
||
1870 | u8 success = 1; // no error occured during read operation to the file. |
||
88 | killagreg | 1871 | s16 c; |
24 | StephanB | 1872 | |
41 | ingob | 1873 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
24 | StephanB | 1874 | |
41 | ingob | 1875 | pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
88 | killagreg | 1876 | |
368 | holgerb | 1877 | while((object_cnt < count) && success) |
24 | StephanB | 1878 | { |
41 | ingob | 1879 | object_size = size; |
368 | holgerb | 1880 | while((size > 0) && success) |
41 | ingob | 1881 | { |
1882 | c = fgetc_(file); |
||
1883 | if(c != EOF) |
||
1884 | { |
||
1885 | *pbuff = (u8)c; // read a byte from the buffer to the opened file. |
||
1886 | pbuff++; |
||
1887 | size--; |
||
1888 | } |
||
1889 | else // error or end of file reached |
||
1890 | { |
||
88 | killagreg | 1891 | success = 0; |
41 | ingob | 1892 | } |
1893 | } |
||
1894 | if(success) object_cnt++; |
||
88 | killagreg | 1895 | } |
41 | ingob | 1896 | return(object_cnt); // return the number of objects succesfully read from the file |
1 | ingob | 1897 | } |
1898 | |||
24 | StephanB | 1899 | |
41 | ingob | 1900 | /****************************************************************************************************************************************/ |
1901 | /* Function: fwrite_(void *buffer, s32 size, s32 count, File *file); */ |
||
1902 | /* */ |
||
1903 | /* Description: This function writes count objects of the specified size */ |
||
1904 | /* from the buffer pointer to the actual position in the file. */ |
||
1905 | /* */ |
||
1906 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
||
1907 | /****************************************************************************************************************************************/ |
||
1908 | u32 fwrite_(void *buffer, u32 size, u32 count, File_t *file) |
||
1 | ingob | 1909 | { |
41 | ingob | 1910 | u32 object_cnt = 0; // count the number of objects written to the file. |
1911 | u32 object_size = 0; // count the number of bytes written from the actual object. |
||
1912 | u8 *pbuff = 0; // a pointer to the actual bufferposition. |
||
1913 | u8 success = 1; // no error occured during write operation to the file. |
||
88 | killagreg | 1914 | s16 c; |
24 | StephanB | 1915 | |
41 | ingob | 1916 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
211 | killagreg | 1917 | if(file->Mode == 'r') return (0); // opened read only |
41 | ingob | 1918 | pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
88 | killagreg | 1919 | |
368 | holgerb | 1920 | while((object_cnt < count) && success) |
1 | ingob | 1921 | { |
41 | ingob | 1922 | object_size = size; |
368 | holgerb | 1923 | while((size > 0) && success) |
1 | ingob | 1924 | { |
41 | ingob | 1925 | c = fputc_(*pbuff, file); // write a byte from the buffer to the opened file. |
1926 | if(c != EOF) |
||
24 | StephanB | 1927 | { |
41 | ingob | 1928 | pbuff++; |
1929 | size--; |
||
24 | StephanB | 1930 | } |
41 | ingob | 1931 | else |
24 | StephanB | 1932 | { |
41 | ingob | 1933 | success = 0; |
24 | StephanB | 1934 | } |
1 | ingob | 1935 | } |
41 | ingob | 1936 | if(success) object_cnt++; |
88 | killagreg | 1937 | } |
1938 | |||
41 | ingob | 1939 | return(object_cnt); // return the number of objects succesfully written to the file |
88 | killagreg | 1940 | } |
1 | ingob | 1941 | |
24 | StephanB | 1942 | |
41 | ingob | 1943 | /****************************************************************************************************************************************/ |
1944 | /* Function: fputs_(const s8 *string, File_t *File); */ |
||
1945 | /* */ |
||
1946 | /* Description: This function writes a string to the specified file. */ |
||
1947 | /* */ |
||
1948 | /* Returnvalue: The function returns a no negative value or EOF on error. */ |
||
1949 | /****************************************************************************************************************************************/ |
||
89 | killagreg | 1950 | s16 fputs_(s8 * const string, File_t * const file) |
24 | StephanB | 1951 | { |
41 | ingob | 1952 | u8 i=0; |
1953 | s16 c = 0; |
||
88 | killagreg | 1954 | |
211 | killagreg | 1955 | if((!Partition.IsValid) || (file == NULL) || (string == NULL)) return(EOF); |
1956 | if(file->Mode == 'r') return(EOF); |
||
368 | holgerb | 1957 | while((string[i] != 0)&& (c != EOF)) |
24 | StephanB | 1958 | { |
41 | ingob | 1959 | c = fputc_(string[i], file); |
1960 | i++; |
||
24 | StephanB | 1961 | } |
41 | ingob | 1962 | return(c); |
24 | StephanB | 1963 | } |
1964 | |||
41 | ingob | 1965 | /****************************************************************************************************************************************/ |
1966 | /* Function: fgets_(s8 *, s16 , File_t *); */ |
||
1967 | /* */ |
||
1968 | /* Description: This function reads a string from the file to the specifies string. */ |
||
1969 | /* */ |
||
1970 | /* Returnvalue: A pointer to the string read from the file or 0 on error. */ |
||
1971 | /****************************************************************************************************************************************/ |
||
89 | killagreg | 1972 | s8 * fgets_(s8 * const string, s16 const length, File_t * const file) |
24 | StephanB | 1973 | { |
89 | killagreg | 1974 | s8 *pbuff; |
1975 | s16 c = 0, bytecount; |
||
88 | killagreg | 1976 | |
89 | killagreg | 1977 | if((!Partition.IsValid) || (file == NULL) || (string == NULL) || (length < 1)) return (0); |
1978 | bytecount = length; |
||
1979 | pbuff = string; // set write pointer to start of string |
||
368 | holgerb | 1980 | while(bytecount > 1) // read the length-1 characters from the file to the string. |
24 | StephanB | 1981 | { |
41 | ingob | 1982 | c = fgetc_(file); // read a character from the opened file. |
1983 | switch(c) |
||
1 | ingob | 1984 | { |
89 | killagreg | 1985 | case 0x0A: // new line |
1986 | *pbuff = 0; // set string terminator |
||
1987 | return(string); // return normal |
||
88 | killagreg | 1988 | |
41 | ingob | 1989 | case EOF: |
89 | killagreg | 1990 | *pbuff = 0; // set string terminator |
1991 | return(0); |
||
1992 | |||
1993 | default: |
||
1994 | *pbuff++ = (s8)c; // copy byte to string |
||
1995 | bytecount--; |
||
88 | killagreg | 1996 | break; |
1 | ingob | 1997 | } |
24 | StephanB | 1998 | } |
89 | killagreg | 1999 | *pbuff = 0; // set string terminator |
41 | ingob | 2000 | return(string); |
24 | StephanB | 2001 | } |
2002 | |||
41 | ingob | 2003 | /****************************************************************************************************************************************/ |
2004 | /* Function: fexist_(const u8*); */ |
||
2005 | /* */ |
||
2006 | /* Description: This function checks if a file already exist. */ |
||
2007 | /* */ |
||
2008 | /* Returnvalue: 1 if the file exist else 0. */ |
||
2009 | /****************************************************************************************************************************************/ |
||
89 | killagreg | 2010 | u8 fexist_(s8 * const filename) |
24 | StephanB | 2011 | { |
41 | ingob | 2012 | u8 exist = 0; |
2013 | File_t *file = 0; |
||
2014 | file = LockFilePointer(); |
||
2015 | exist = FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file); |
||
2016 | UnlockFilePointer(file); |
||
2017 | return(exist); |
||
1 | ingob | 2018 | } |
24 | StephanB | 2019 | |
41 | ingob | 2020 | /****************************************************************************************************************************************/ |
2021 | /* Function: feof_(File_t *File); */ |
||
2022 | /* */ |
||
2023 | /* Description: This function checks wether the end of the file has been reached. */ |
||
2024 | /* */ |
||
2025 | /* Returnvalue: 0 if the end of the file was not reached otherwise 1. */ |
||
2026 | /****************************************************************************************************************************************/ |
||
2027 | u8 feof_(File_t *file) |
||
88 | killagreg | 2028 | { |
41 | ingob | 2029 | if(((file->Position)+1) < (file->Size)) |
24 | StephanB | 2030 | { |
2031 | return(0); |
||
2032 | } |
||
88 | killagreg | 2033 | else |
24 | StephanB | 2034 | { |
88 | killagreg | 2035 | return(1); |
24 | StephanB | 2036 | } |
2037 | } |
||
41 | ingob | 2038 | |
210 | killagreg | 2039 | /****************************************************************************************************************************************************/ |
2040 | /* Function: s8* FAT16_GetVolumeLabel(void) */ |
||
2041 | /* */ |
||
2042 | /* Description: This function returns the volume label */ |
||
2043 | /* */ |
||
2044 | /* Returnvalue: This function returns the pointer to the volume label or NULL if not found. */ |
||
2045 | /****************************************************************************************************************************************************/ |
||
2046 | s8* FAT16_GetVolumeLabel(void) |
||
2047 | { |
||
2048 | s8 *pVolumeLabel = NULL; |
||
2049 | u32 dir_sector, max_dir_sector, curr_sector; |
||
2050 | u16 dir_entry = 0; |
||
2051 | u8 i = 0; |
||
41 | ingob | 2052 | |
210 | killagreg | 2053 | DirEntry_t * dir; |
2054 | File_t *file = NULL; |
||
2055 | |||
2056 | // if Partition is not valud return NULL |
||
2057 | if(!Partition.IsValid) return(pVolumeLabel); |
||
2058 | // if Volume label was read before return it |
||
2059 | if(Partition.VolumeLabel[0]!= '\0') return (Partition.VolumeLabel); |
||
2060 | // try to catch a file pointer |
||
2061 | file = LockFilePointer(); |
||
2062 | if(file == NULL) return(pVolumeLabel); |
||
2063 | // search dir entries direct within the root directory area |
||
2064 | file->DirectorySector = 0; |
||
2065 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
||
2066 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
||
2067 | |||
2068 | // update current file data area position to start of first cluster |
||
2069 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
||
2070 | file->SectorOfCurrCluster = 0; |
||
2071 | file->ByteOfCurrSector = 0; |
||
2072 | |||
2073 | dir_sector = 0; // reset sector counter within a new cluster |
||
2074 | do // loop over all sectors of the root directory |
||
2075 | { |
||
2076 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
||
2077 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
||
2078 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
||
2079 | { |
||
2080 | Fat16_Deinit(); |
||
379 | holgerb | 2081 | return(NULL); |
210 | killagreg | 2082 | } |
2083 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
||
2084 | // search all directory entries within that sector |
||
2085 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
||
2086 | { // check for existing dir entry |
||
2087 | switch((u8)dir[dir_entry].Name[0]) |
||
2088 | { |
||
2089 | case SLOT_EMPTY: |
||
2090 | case SLOT_DELETED: |
||
2091 | // ignore empty or deleted dir entries |
||
2092 | break; |
||
2093 | default: |
||
2094 | // check attributes for volume label |
||
2095 | if ((dir[dir_entry].Attribute & ATTR_VOLUMELABEL) != ATTR_VOLUMELABEL) break; // attribute must match |
||
2096 | // (first 11 characters include 8 chars of basename and 3 chars extension.) |
||
2097 | for(i = 0; i<11;i++) Partition.VolumeLabel[i] = dir[dir_entry].Name[i]; |
||
2098 | Partition.VolumeLabel[11] = '\0'; // terminate string |
||
2099 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
||
2100 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
||
2101 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
||
219 | killagreg | 2102 | file->SectorOfCurrCluster = 0; |
2103 | file->ByteOfCurrSector = 0; |
||
210 | killagreg | 2104 | file->DirectorySector = curr_sector; // current sector |
2105 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
||
2106 | file->Size = dir[dir_entry].Size; |
||
2107 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
||
2108 | pVolumeLabel = Partition.VolumeLabel; |
||
2109 | } // end of first byte of name check |
||
2110 | } |
||
2111 | dir_sector++; // search next sector |
||
2112 | // stop if we reached the end of the cluster or the end of the root dir |
||
368 | holgerb | 2113 | }while((dir_sector < max_dir_sector) && (!pVolumeLabel)); |
210 | killagreg | 2114 | |
2115 | UnlockFilePointer(file); |
||
2116 | return(pVolumeLabel); |
||
2117 | } |
||
379 | holgerb | 2118 | |
2119 | |||
2120 | |||
2121 | #define ATTR_NONE 0x00 // normal file |
||
2122 | #define ATTR_READONLY 0x01 // file is readonly |
||
2123 | #define ATTR_HIDDEN 0x02 // file is hidden |
||
2124 | #define ATTR_SYSTEM 0x04 // file is a system file |
||
2125 | #define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
||
2126 | #define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
||
2127 | #define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
||
2128 | #define ATTR_ARCHIVE 0x20 // file is new or modified |
||
2129 | |||
2130 | |||
2131 | /********************************************************************************************************************************************/ |
||
2132 | /* Function: u8 FindItem(Find_t); */ |
||
2133 | /* */ |
||
2134 | /* Description: This function looks for the item specified by global structure FindElement in the actual directory */ |
||
2135 | /* */ |
||
2136 | /* */ |
||
2137 | /* Returnvalue: TRUE if an matching element was found */ |
||
2138 | /********************************************************************************************************************************************/ |
||
2139 | |||
2140 | u8 FindItem(Find_t *findelement) |
||
2141 | { |
||
2142 | u16 index = 0; |
||
2143 | u16 max_dir_sector = 0; |
||
2144 | u16 end_of_directory_not_reached = 1; // the directory has been read completely without a result. |
||
2145 | u8 i = 0; |
||
2146 | u8 readpointer = 0; |
||
2147 | u8 writepointer = 0; |
||
2148 | u8 retvalue = 0; |
||
2149 | DirEntry_t *DirectoryEntry; |
||
2150 | File_t file; |
||
2151 | |||
2152 | file.FirstSectorOfCurrCluster = findelement->fp.FirstSectorOfCurrCluster; |
||
2153 | file.SectorOfCurrCluster = findelement->fp.SectorOfCurrCluster; |
||
2154 | index = findelement->fp.DirectoryIndex; |
||
2155 | |||
2156 | // within the root directory area we can read sectors sequentially until the end of this area |
||
2157 | if((Partition.FirstRootDirSector <= file.FirstSectorOfCurrCluster) && (file.FirstSectorOfCurrCluster < Partition.FirstDataSector)) |
||
2158 | { |
||
2159 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
||
2160 | } |
||
2161 | // within the data clusters we can read sectors sequentially only within the cluster |
||
2162 | else if((Partition.FirstDataSector <= file.FirstSectorOfCurrCluster) && (file.FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
||
2163 | { |
||
2164 | max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
||
2165 | } |
||
2166 | |||
2167 | do |
||
2168 | { // search the next 16 rootentries in this sector of the roordirectory. |
||
2169 | if(SD_SUCCESS != SDC_GetSector(((u32) file.FirstSectorOfCurrCluster + (u32)file.SectorOfCurrCluster), file.Cache)); // Read the Rootdirectory. |
||
2170 | { |
||
2171 | Fat16_Deinit(); |
||
2172 | return(0); |
||
2173 | } |
||
2174 | |||
2175 | DirectoryEntry = (DirEntry_t *)file.Cache; |
||
2176 | |||
2177 | while((!retvalue)&&(index<16)) |
||
2178 | { |
||
2179 | i=0; |
||
2180 | if((u8) DirectoryEntry[index].Name[0] != 0xe5) // ignore deleted items. |
||
2181 | { |
||
2182 | while((i<=10)&&((DirectoryEntry[index].Name[i] == findelement->searchstring[i]) || (findelement->searchstring[i]=='*') || findelement->searchstring[i]=='?')) |
||
2183 | { |
||
2184 | i++; |
||
2185 | } |
||
2186 | } |
||
2187 | if((DirectoryEntry[index].Attribute <= 0x30) && (DirectoryEntry[index].Attribute & findelement->attribmask) && (i==11)) |
||
2188 | { |
||
2189 | for(readpointer=0;readpointer<=10;readpointer++) |
||
2190 | { |
||
2191 | if((DirectoryEntry[index].Name[readpointer] != ' ') && (readpointer!=8)) |
||
2192 | { |
||
2193 | findelement->name[writepointer] = DirectoryEntry[index].Name[readpointer]; // copy the name of the item found to the find_structure. |
||
2194 | writepointer++; |
||
2195 | } |
||
2196 | else |
||
2197 | { |
||
2198 | if(DirectoryEntry[index].Attribute == ATTR_ARCHIVE) |
||
2199 | { |
||
2200 | if(readpointer < 8) readpointer=8; |
||
2201 | if(DirectoryEntry[index].Name[readpointer] != ' ') |
||
2202 | { |
||
2203 | findelement->name[writepointer] = '.'; // then seperate the name and the extension by a '.' at index 8. |
||
2204 | writepointer++; |
||
2205 | findelement->name[writepointer] = DirectoryEntry[index].Name[readpointer]; // copy the name of the item found to the find_structure. |
||
2206 | writepointer++; |
||
2207 | } |
||
2208 | else break; |
||
2209 | } |
||
2210 | else break; |
||
2211 | } |
||
2212 | /* terminate the namestring with 0 for debugpurposes*/ |
||
2213 | findelement->name[12] = 0; |
||
2214 | } |
||
2215 | findelement->fp.FirstSectorOfFirstCluster = (u32) DirectoryEntry[index].StartCluster; |
||
2216 | findelement->fp.DirectoryIndex = index; |
||
2217 | findelement->fp.FirstSectorOfCurrCluster = file.FirstSectorOfCurrCluster; |
||
2218 | findelement->fp.DirectorySector = (file.FirstSectorOfCurrCluster + file.SectorOfCurrCluster); |
||
2219 | findelement->fp.SectorOfCurrCluster = file.SectorOfCurrCluster; |
||
2220 | findelement->fp.Size = DirectoryEntry[index].Size; |
||
2221 | findelement->fp.Attribute = DirectoryEntry[index].Attribute; |
||
2222 | retvalue = 1; |
||
2223 | } |
||
2224 | /* search the next sector */ |
||
2225 | index++; |
||
2226 | } |
||
2227 | /* this sector has been searched but we havn't found what we are looking for. Therefore we have to find the next sector */ |
||
2228 | if(!retvalue) // file not found in this sector so take next sector. |
||
2229 | { |
||
2230 | /* in the next sector we start looking for the specified entry beginning at index 0 */ |
||
2231 | index = 0; |
||
2232 | /* there are still sectors to be read within the cluster or within the linear addresspace of the rootdirectory */ |
||
2233 | if(file.SectorOfCurrCluster < max_dir_sector-1) file.SectorOfCurrCluster++; else end_of_directory_not_reached = 0; |
||
2234 | /* if we are looking for an directoryentry outside the rootdirectory and have reached the end of the cluster we have to get the next one */ |
||
2235 | if(Partition.FirstDataSector <= file.FirstSectorOfCurrCluster) |
||
2236 | { |
||
2237 | end_of_directory_not_reached = GetNextCluster(&file); |
||
2238 | } |
||
2239 | } |
||
2240 | } |
||
2241 | while((end_of_directory_not_reached) && (!retvalue) ); |
||
2242 | |||
2243 | return(retvalue); |
||
2244 | } |
||
2245 | |||
2246 | |||
2247 | |||
2248 | |||
2249 | /********************************************************************************************************************************************/ |
||
2250 | /* Function: findnext_(Find_t *); */ |
||
2251 | /* */ |
||
2252 | /* Description: This function looks for the next item in the specified directory with a matching filename and fileattributes specified */ |
||
2253 | /* by function findfirst() */ |
||
2254 | /* */ |
||
2255 | /* Returnvalue: */ |
||
2256 | /********************************************************************************************************************************************/ |
||
2257 | u8 findnext_(Find_t * findelement) |
||
2258 | { |
||
2259 | u8 itemfound = 0; |
||
2260 | u8 index = 0; |
||
2261 | |||
2262 | findelement->fp.DirectoryIndex++; |
||
2263 | |||
2264 | /* before we start searching an element we clear the complete namestring within the structure FindElement */ |
||
2265 | for(index=0;index<11;index++) findelement->name[index] = 0; |
||
2266 | |||
2267 | if(FindItem(findelement)) |
||
2268 | { |
||
2269 | itemfound = 1; |
||
2270 | } |
||
2271 | |||
2272 | return(itemfound); |
||
2273 | } |
||
2274 | |||
2275 | |||
2276 | |||
2277 | /********************************************************************************************************************************************/ |
||
2278 | /* Function: findfirst_(s8* filename, u8 attribmask, Find_t *); */ |
||
2279 | /* */ |
||
2280 | /* Description: This function looks for the first item in the specified directory with a matching filename and fileattributes */ |
||
2281 | /* The filename of the element found is transformed from 8.3 to a string */ |
||
2282 | /* */ |
||
2283 | /* */ |
||
2284 | /* Returnvalue: (1) if Element was found. (0) if no valid element was found */ |
||
2285 | /********************************************************************************************************************************************/ |
||
2286 | u8 findfirst_(const s8* name, u8 attribmask, Find_t *findelement) |
||
2287 | { |
||
2288 | u8 itemfound = 0; |
||
2289 | u8 index = 0; |
||
2290 | |||
2291 | /* initialize the FindElement structure */ |
||
2292 | findelement->fp.FirstSectorOfFirstCluster = 0; // First sector of the first cluster of the file. |
||
2293 | findelement->fp.FirstSectorOfCurrCluster = Partition.CurrentWorkingDirectory; // First sector of the cluster which is edited at the moment. |
||
2294 | findelement->fp.SectorOfCurrCluster = 0; // The sector within the current cluster. |
||
2295 | findelement->fp.ByteOfCurrSector = 0; // The byte location within the current sector. |
||
2296 | findelement->fp.Size = 0; // The size of the opend file in bytes. |
||
2297 | findelement->fp.Position = 0; // Pointer to a character within the file 0 < fileposition < filesize |
||
2298 | findelement->fp.DirectorySector = 0; // the sectorposition where the directoryentry has been made. |
||
2299 | findelement->fp.DirectoryIndex = 0; // The index to the directoryentry within the specified sector. |
||
2300 | findelement->attribfilter = 0; |
||
2301 | findelement->attribmask = attribmask; |
||
2302 | findelement->searchstring[0]=0; |
||
2303 | |||
2304 | /* seperate the name of the element to be found from the filepath and bring it to the 8.3*/ |
||
2305 | SeperateDirName(name, findelement->searchstring); |
||
2306 | /* after the name of the element is in 8.3 we process the wildcards (*). After an * all following character are wildcards to */ |
||
2307 | for(index=0;index<8;index++) |
||
2308 | { |
||
2309 | /* if we find an wildcard within the name of the searchstring all remaining character after the wildcard shall be wildcards also */ |
||
2310 | if(findelement->searchstring[index] == '*') |
||
2311 | { |
||
2312 | /* */ |
||
2313 | while(++index <8) findelement->searchstring[index] = '*'; |
||
2314 | } |
||
2315 | } |
||
2316 | for(index=8;index<11;index++) |
||
2317 | { |
||
2318 | /* if we find an wildcard within the name of the searchstring all remaining character after the wildcard shall be wildcards also */ |
||
2319 | if(findelement->searchstring[index] == '*') |
||
2320 | { |
||
2321 | /* */ |
||
2322 | while(++index <11) findelement->searchstring[index] = '*'; |
||
2323 | } |
||
2324 | } |
||
2325 | |||
2326 | /* the value of ...DirectoryIndex will be incremented in findnext_() thererfore it has to be decremented in findfirst_() */ |
||
2327 | findelement->fp.DirectoryIndex--; |
||
2328 | /* now lets search for the item within the direcory */ |
||
2329 | itemfound = findnext_(findelement); |
||
2330 | |||
2331 | return(itemfound); |
||
2332 | } |
||
2333 | |||
2334 | |||
2335 | /********************************************************************************************************************************************/ |
||
2336 | /* Function: u8 GetDirCount(s8* filepath); */ |
||
2337 | /* */ |
||
2338 | /* Description: This function counts the number of subdirectories the dirpath contains */ |
||
2339 | /* */ |
||
2340 | /* */ |
||
2341 | /* Returnvalue: then number of subdirectories within the specified path */ |
||
2342 | /********************************************************************************************************************************************/ |
||
2343 | u8 GetDirCount(u8 *dirpath) |
||
2344 | { |
||
2345 | u8 i=0; |
||
2346 | u8 cnt=0; |
||
2347 | |||
2348 | while(dirpath[i] != 0 ) |
||
2349 | { |
||
2350 | if(dirpath[i]=='/') |
||
2351 | { |
||
2352 | if(dirpath[i+1]!=0) cnt++; // ignore last'/' |
||
2353 | } |
||
2354 | i++; |
||
2355 | } |
||
2356 | i=0; |
||
2357 | return(cnt); |
||
2358 | } |
||
2359 | |||
2360 | |||
2361 | /********************************************************************************************************************************************/ |
||
2362 | /* Funtion: char *GetSubDirectory (char *dirpath, char *directory) */ |
||
2363 | /* */ |
||
2364 | /* Description: this function returns a pointer to the beginning of the next subdirectory or NULL */ |
||
2365 | /* */ |
||
2366 | /* */ |
||
2367 | /* returnvalue: number of subdirectories in the filepath */ |
||
2368 | /********************************************************************************************************************************************/ |
||
2369 | u8 * GetSubDirectory(u8 *dirpath, u8 *directory) |
||
2370 | { |
||
2371 | u8 *cptr = dirpath; |
||
2372 | u8 *dptr = directory; |
||
2373 | u8 *retvalue = NULL; |
||
2374 | |||
2375 | /* if the first character of the path is an '/' we go to the next character */ |
||
2376 | if(*cptr == '/') cptr++; |
||
2377 | /* search end of path or subdirectory*/ |
||
2378 | while((*cptr != 0) && (*cptr != '/')) |
||
2379 | { |
||
2380 | *dptr = *cptr; |
||
2381 | dptr++; |
||
2382 | cptr++; |
||
2383 | } |
||
2384 | if(*cptr!=0) retvalue = ++cptr; |
||
2385 | *dptr = 0; |
||
2386 | |||
2387 | return(retvalue); |
||
2388 | } |
||
2389 | |||
2390 | /********************************************************************************************************************************************/ |
||
2391 | /* Function: s8 *GetPath(void); */ |
||
2392 | /* */ |
||
2393 | /* Description: This function function returns a pointer to the absolute path of the active partition */ |
||
2394 | /* */ |
||
2395 | /* */ |
||
2396 | /* Returnvalue: */ |
||
2397 | /********************************************************************************************************************************************/ |
||
2398 | |||
2399 | s8 *GetPath(void) |
||
2400 | { |
||
2401 | return(Partition.PathToCwd); |
||
2402 | } |
||
2403 | |||
2404 | /********************************************************************************************************************************************/ |
||
2405 | /* Function: void SetPathToRoot(void); */ |
||
2406 | /* */ |
||
2407 | /* Description: This function sets the path to the rootdirectory */ |
||
2408 | /* */ |
||
2409 | /* */ |
||
2410 | /* Returnvalue: */ |
||
2411 | /********************************************************************************************************************************************/ |
||
2412 | |||
2413 | void SetPathToRoot(void) |
||
2414 | { |
||
2415 | /* lets point to the rootdirectory */ |
||
2416 | strcpy(Partition.PathToCwd, "/"); |
||
2417 | } |
||
2418 | |||
2419 | /********************************************************************************************************************************************/ |
||
2420 | /* Function: void AppendDirToPath(s8* directory); */ |
||
2421 | /* */ |
||
2422 | /* Description: This function function appends the name of an directory to the Path to the CWD */ |
||
2423 | /* */ |
||
2424 | /* */ |
||
2425 | /* Returnvalue: */ |
||
2426 | /********************************************************************************************************************************************/ |
||
2427 | |||
2428 | void AppendDirToPath(s8* directory) |
||
2429 | { |
||
2430 | /* append the name of the directory to the path */ |
||
2431 | strcat(Partition.PathToCwd, directory); |
||
2432 | /* append a '/' after the directoryname */ |
||
2433 | strcat(Partition.PathToCwd, "/"); |
||
2434 | } |
||
2435 | |||
2436 | /********************************************************************************************************************************************/ |
||
2437 | /* Function: RemoveLastDirFromPath(void); */ |
||
2438 | /* */ |
||
2439 | /* Description: This function removes the last directory from the path to the cwd */ |
||
2440 | /* */ |
||
2441 | /* */ |
||
2442 | /* Returnvalue: */ |
||
2443 | /********************************************************************************************************************************************/ |
||
2444 | |||
2445 | void RemoveLastDirFromPath(void) |
||
2446 | { |
||
2447 | /* a pointer to the beginning of the absolute path to the cwd */ |
||
2448 | s8 * cptr = Partition.PathToCwd; |
||
2449 | /* lets find the end of the path to the cwd */ |
||
2450 | while(*cptr != 0 ) cptr++; |
||
2451 | /* if the path is terminated with an '/' */ |
||
2452 | if((*(cptr-1)) == '/') *(cptr-1)=0; |
||
2453 | /* now lets find the beginning of the last directorientry */ |
||
2454 | while((*cptr != '/' ) && cptr > Partition.PathToCwd) cptr--; |
||
2455 | /* is there one subdirectory left within the path? */ |
||
2456 | if(cptr > Partition.PathToCwd) |
||
2457 | { |
||
2458 | /* we delete the direntry by terminating the path with 0 */ |
||
2459 | *cptr = 0; |
||
2460 | } |
||
2461 | /* there is no subdirectory left within the path. Therefore we create the root instead. */ |
||
2462 | else |
||
2463 | { |
||
2464 | *cptr = '/'; |
||
2465 | *(cptr+1) = 0; |
||
2466 | } |
||
2467 | } |
||
2468 | |||
2469 | /********************************************************************************************************************************************/ |
||
2470 | /* Function: chdir_(s8* filepath); */ |
||
2471 | /* */ |
||
2472 | /* Description: This function changed the current working directory to the directory specified by the filepath */ |
||
2473 | /* by function findfirst() */ |
||
2474 | /* */ |
||
2475 | /* Returnvalue: */ |
||
2476 | /********************************************************************************************************************************************/ |
||
2477 | /* |
||
2478 | #define ATTR_NONE 0x00 // normal file |
||
2479 | #define ATTR_READONLY 0x01 // file is readonly |
||
2480 | #define ATTR_HIDDEN 0x02 // file is hidden |
||
2481 | #define ATTR_SYSTEM 0x04 // file is a system file |
||
2482 | #define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
||
2483 | #define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
||
2484 | #define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
||
2485 | #define ATTR_ARCHIVE 0x20 // file is new or modified |
||
2486 | */ |
||
2487 | |||
2488 | u8 chdir_(s8 *path) |
||
2489 | { |
||
2490 | u8 retvalue = 0; // the value returned by this function |
||
2491 | u32 ultemp = 0; // temp. variable |
||
2492 | u8 *directory = path; // pointer to a directoryname within the path |
||
2493 | u8 dircount = 0; // the number of subdirectoryentries within the path |
||
2494 | u8 cache[64]; // a buffer containing the name of the subdirectory we are actually looking for |
||
2495 | Find_t fe; // The findelement needed for function findfirst to find the subdirectoryentry |
||
2496 | s8 tp[256]; // temporarily we remember the actual path until the operation has finished successfully |
||
2497 | u32 cwdt = 0; |
||
2498 | s8 *cptr; |
||
2499 | |||
2500 | /* bring the path into the correct syntax */ |
||
2501 | cptr = path; |
||
2502 | /* search the whole string */ |
||
2503 | while(*cptr != 0 ) |
||
2504 | { |
||
2505 | if(*cptr == '\\') *cptr = '/'; |
||
2506 | cptr++; |
||
2507 | } |
||
2508 | /* lets remember the actual path */ |
||
2509 | strcpy(tp, Partition.PathToCwd); |
||
2510 | cwdt = Partition.CurrentWorkingDirectory; |
||
2511 | /* how many subdirectories are there within the path? */ |
||
2512 | dircount = GetDirCount(path); |
||
2513 | /* if the path is absolute we begin at the rootdirectory */ |
||
2514 | if(path[0] == '/') |
||
2515 | { |
||
2516 | strcpy(Partition.PathToCwd, "/"); |
||
2517 | Partition.CurrentWorkingDirectory = Partition.FirstRootDirSector; |
||
2518 | /* if there is no other pathinformation we only switch to the rootdirectory. So theres nothing left todo.*/ |
||
2519 | if(!dircount) return(1); |
||
2520 | } |
||
2521 | /* now we parse through all the subdirectories within the path */ |
||
2522 | do |
||
2523 | { |
||
2524 | /* until all the subdirectories within the path have been processed */ |
||
2525 | if(dircount) dircount--; |
||
2526 | /* this is the name of the next subdirectory we are looking for */ |
||
2527 | directory = GetSubDirectory(directory, cache); |
||
2528 | /* search for the next subdirectory within the path */ |
||
2529 | if(findfirst_(cache, ATTR_SUBDIRECTORY, &fe)) |
||
2530 | { |
||
2531 | /* we try to change into the directory "..". Now we have to delete the last direntry from the path */ |
||
2532 | if(strcmp(cache,"..") == 0) RemoveLastDirFromPath(); |
||
2533 | /* we try to change into the actual directory so there's nothing todo */ |
||
2534 | else if(cache[0] == '.') return(1); |
||
2535 | /* otherwise we append the name of the directory we are changing in to the path */ |
||
2536 | else AppendDirToPath(cache); |
||
2537 | /* The startcluster within an directoryentry specifies the position within the fat where the file or directory starts */ |
||
2538 | ultemp = (u32) fe.fp.FirstSectorOfFirstCluster; |
||
2539 | /* the first 2 entries are reserved for '.' and '..' */ |
||
2540 | ultemp -= 2; |
||
2541 | /* now we have to transform the position within the fat into the corrosponding sectoraddress relative to the beginning of the datasection of the active partition*/ |
||
2542 | ultemp *= Partition.SectorsPerCluster; |
||
2543 | /* at least we make the sectoraddress absolute by adding the relative address to the beginning of the datasection of the active partition */ |
||
2544 | ultemp += Partition.FirstDataSector; |
||
2545 | /* the cwd now points to the specified directory */ |
||
2546 | Partition.CurrentWorkingDirectory = ultemp; |
||
2547 | /* we found the folder specified by the foldername */ |
||
2548 | retvalue = 1; |
||
2549 | } |
||
2550 | } |
||
2551 | /* do this until all subdirectories have been found or a subdirectory is missing */ |
||
2552 | while(dircount && retvalue ); |
||
2553 | |||
2554 | /* if we could not change to the specified directory we restore the actual path */ |
||
2555 | if(!retvalue) |
||
2556 | { |
||
2557 | Partition.CurrentWorkingDirectory = cwdt; |
||
2558 | strcpy(Partition.PathToCwd, tp); |
||
2559 | } |
||
2560 | return(retvalue); |
||
2561 | } |