0,0 → 1,2548 |
/*#######################################################################################*/ |
/* !!! THIS IS NOT FREE SOFTWARE !!! */ |
/*#######################################################################################*/ |
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
// + www.MikroKopter.com |
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
// + Software Nutzungsbedingungen (english version: see below) |
// + der Fa. HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland - nachfolgend Lizenzgeber genannt - |
// + Der Lizenzgeber räumt dem Kunden ein nicht-ausschließliches, zeitlich und räumlich* unbeschränktes Recht ein, die im den |
// + Mikrocontroller verwendete Firmware für die Hardware Flight-Ctrl, Navi-Ctrl, BL-Ctrl, MK3Mag & PC-Programm MikroKopter-Tool |
// + - nachfolgend Software genannt - nur für private Zwecke zu nutzen. |
// + Der Einsatz dieser Software ist nur auf oder mit Produkten des Lizenzgebers zulässig. |
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
// + Die vom Lizenzgeber gelieferte Software ist urheberrechtlich geschützt. Alle Rechte an der Software sowie an sonstigen im |
// + Rahmen der Vertragsanbahnung und Vertragsdurchführung überlassenen Unterlagen stehen im Verhältnis der Vertragspartner ausschließlich dem Lizenzgeber zu. |
// + Die in der Software enthaltenen Copyright-Vermerke, Markenzeichen, andere Rechtsvorbehalte, Seriennummern sowie |
// + sonstige der Programmidentifikation dienenden Merkmale dürfen vom Kunden nicht verändert oder unkenntlich gemacht werden. |
// + Der Kunde trifft angemessene Vorkehrungen für den sicheren Einsatz der Software. Er wird die Software gründlich auf deren |
// + Verwendbarkeit zu dem von ihm beabsichtigten Zweck testen, bevor er diese operativ einsetzt. |
// + Die Haftung des Lizenzgebers wird - soweit gesetzlich zulässig - begrenzt in Höhe des typischen und vorhersehbaren |
// + Schadens. Die gesetzliche Haftung bei Personenschäden und nach dem Produkthaftungsgesetz bleibt unberührt. Dem Lizenzgeber steht jedoch der Einwand |
// + des Mitverschuldens offen. |
// + Der Kunde trifft angemessene Vorkehrungen für den Fall, dass die Software ganz oder teilweise nicht ordnungsgemäß arbeitet. |
// + Er wird die Software gründlich auf deren Verwendbarkeit zu dem von ihm beabsichtigten Zweck testen, bevor er diese operativ einsetzt. |
// + Der Kunde wird er seine Daten vor Einsatz der Software nach dem Stand der Technik sichern. |
// + Der Kunde ist darüber unterrichtet, dass der Lizenzgeber seine Daten im zur Vertragsdurchführung erforderlichen Umfang |
// + und auf Grundlage der Datenschutzvorschriften erhebt, speichert, verarbeitet und, sofern notwendig, an Dritte übermittelt. |
// + *) Die räumliche Nutzung bezieht sich nur auf den Einsatzort, nicht auf die Reichweite der programmierten Software. |
// + #### ENDE DER NUTZUNGSBEDINGUNGEN ####' |
// + Hinweis: Informationen über erweiterte Nutzungsrechte (wie z.B. Nutzung für nicht-private Zwecke) sind auf Anfrage per Email an info(@)hisystems.de verfügbar. |
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
// + Software LICENSING TERMS |
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
// + of HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland, Germany - the Licensor - |
// + 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 |
// + (the Software) exclusively for private purposes. The License is unrestricted with respect to time and territory*. |
// + The Software may only be used with the Licensor's products. |
// + The Software provided by the Licensor is protected by copyright. With respect to the relationship between the parties to this |
// + agreement, all rights pertaining to the Software and other documents provided during the preparation and execution of this |
// + agreement shall be the property of the Licensor. |
// + The information contained in the Software copyright notices, trademarks, other legal reservations, serial numbers and other |
// + features that can be used to identify the program may not be altered or defaced by the customer. |
// + The customer shall be responsible for taking reasonable precautions |
// + for the safe use of the Software. The customer shall test the Software thoroughly regarding its suitability for the |
// + intended purpose before implementing it for actual operation. The Licensor's liability shall be limited to the extent of typical and |
// + foreseeable damage to the extent permitted by law, notwithstanding statutory liability for bodily injury and product |
// + liability. However, the Licensor shall be entitled to the defense of contributory negligence. |
// + The customer will take adequate precautions in the case, that the software is not working properly. The customer will test |
// + the software for his purpose before any operational usage. The customer will backup his data before using the software. |
// + The customer understands that the Licensor collects, stores and processes, and, where required, forwards, customer data |
// + to third parties to the extent necessary for executing the agreement, subject to applicable data protection and privacy regulations. |
// + *) The territory aspect only refers to the place where the Software is used, not its programmed range. |
// + #### END OF LICENSING TERMS #### |
// + Note: For information on license extensions (e.g. commercial use), please contact us at info(@)hisystems.de. |
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
#include <stdio.h> |
#include <string.h> |
#include "91x_lib.h" |
#include "timer1.h" |
#include "fat16.h" |
#include "sdc.h" |
#include "uart1.h" |
#include "main.h" |
#include "logging.h" |
|
|
//________________________________________________________________________________________________________________________________________ |
// Module name: fat16.c |
// Compiler used: avr-gcc 3.4.5 |
// Last Modifikation: 20.03.2010 |
// Version: 2.10 |
// Authors: Stephan Busker & Gregor Stobrawa |
// Description: Source files for FAT16 implementation with read and write-access |
// Copyright (C) 2008 Stephan Busker & Gregor Stobrawa |
//........................................................................................................................................ |
// Functions: extern s16 Fat16_Init(void); |
// extern s16 Fat16_Deinit(void); |
// extern s8* FAT16_GetVolumeLabel(void); |
// extern File_t * fopen_(const u8 *filename, const s8 mode); |
// extern s16 fclose_(File_t *File); |
// extern u8 fexist_(s8 * const filename); |
// extern s16 fflush_(File_t *File); |
// extern s16 fseek_(File_t *File, s32 offset, s16 origin); |
// extern s16 fgetc_(File_t *File); |
// extern s16 fputc_(u8 c, File_t *File); |
// extern u32 fread_(void *buffer, u32 size, u32 count, File_t *File); |
// extern u32 fwrite_(void *buffer, u32 size, u32 count, File_t *File); |
// extern s16 fputs_(const u8 *string, File_t *File); |
// extern u8 * fgets_(u8 *string, s16 length, File_t *File); |
// extern u8 feof_(File_t * const file); |
//........................................................................................................................................ |
// ext. functions: extern SD_Result_t SDC_Init(void;) |
// extern SD_Result_t SDC_Deinit(void); |
// extern SD_Result_t SDC_GetSector (u32,u8 *); |
// extern SD_Result_t SDC_PutSector (u32,u8 *); |
//........................................................................................................................................ |
// |
// URL: www.Mikro-Control.de |
// mailto: stephan.busker@mikro-control.de |
//________________________________________________________________________________________________________________________________________ |
|
/* |
FAT16 Drive Layout: |
Description Offset |
Volume Boot Sector Start of Partition |
Fat Tables Start + # of Reserved Sectors |
Root Directory Entry Start + # of Reserved + (# of Sectors Per FAT * 2) |
Data Area (Starts with Cluster #2) Start + # of Reserved + (# of Sectors Per FAT * 2) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
*/ |
|
|
|
/* |
________________________________________________________________________________________________________________________________________ |
|
Structure of an partition entry |
________________________________________________________________________________________________________________________________________ |
|
Partition Entry is 16 bytes long |
*/ |
typedef struct |
{ |
u8 PartitionState; // Current State of Partition (00h=Inactive, 80h=Active) |
u8 BeginningHead; // Beginning of Partition - Head |
u16 BeginningCylSec; // Beginning of Partition - Cylinder/Sector (See Below) |
u8 Type; // Type of Partition (See List Below) |
u8 EndHead; // End of Partition - Head |
u16 EndCylSec; // End of Partition - Cylinder/Sector |
u32 NoSectorsBeforePartition; // Number of Sectors between the MBR and the First Sector in the Partition |
u32 NoSectorsPartition ; // Number of Sectors in the Partition |
} __attribute__((packed)) PartitionEntry_t; |
|
|
|
/* |
Coding of Cylinder/Sector words |
|
Cylinder is 10 bits: [7:0] at [15:8] and [9:8] at [7:6] |
Sector is 5 bits: [5:0] at [5:0] |
*/ |
|
// Partition Types: |
#define PART_TYPE_UNKNOWN 0x00 |
#define PART_TYPE_FAT12 0x01 |
#define PART_TYPE_XENIX 0x02 |
#define PART_TYPE_FAT16_ST_32_MB 0x04 |
#define PART_TYPE_EXTDOS 0x05 |
#define PART_TYPE_FAT16_LT_32_MB 0x06 |
#define PART_TYPE_NTFS 0x07 |
#define PART_TYPE_FAT32 0x0B |
#define PART_TYPE_FAT32LBA 0x0C |
#define PART_TYPE_FAT16LBA 0x0E |
#define PART_TYPE_EXTDOSLBA 0x0F |
#define PART_TYPE_EISA 0x12 |
#define PART_TYPE_ONTRACK 0x33 |
#define PART_TYPE_NOVELL 0x40 |
#define PART_TYPE_DYNAMIC 0x42 |
#define PART_TYPE_PCIX 0x4B |
#define PART_TYPE_LINUX_SWAP 0x82 |
#define PART_TYPE_LINUX_NATIVE 0x83 |
#define PART_TYPE_LINUX_LVM 0x8E |
#define PART_TYPE_PHOENIXSAVE 0xA0 |
#define PART_TYPE_FREEBSD 0xA5 |
#define PART_TYPE_OPENBSD 0xA6 |
#define PART_TYPE_NETNBSD 0xA9 |
#define PART_TYPE_CPM 0xDB |
#define PART_TYPE_DBFS 0xE0 |
#define PART_TYPE_BBT 0xFF |
|
|
/* |
________________________________________________________________________________________________________________________________________ |
|
Structure of the MasterBootRecord |
________________________________________________________________________________________________________________________________________ |
|
Master Boot Record is 512 bytes long |
The Master Boot Record is the same for pretty much all Operating Systems. |
It is located on the first Sector of the Hard Drive, at Cylinder 0, Head 0, Sector 1 |
*/ |
typedef struct |
{ |
u8 ExecutableCode[446]; // 446 bytes for machine start code |
PartitionEntry_t PartitionEntry1; // 16 bytes for partition entry 1 |
PartitionEntry_t PartitionEntry2; // 16 bytes for partition entry 2 |
PartitionEntry_t PartitionEntry3; // 16 bytes for partition entry 3 |
PartitionEntry_t PartitionEntry4; // 16 bytes for partition entry 4 |
u16 ExecutableMarker; // BIOS-Signature (0x55 0xAA) |
} __attribute__((packed)) MBR_Entry_t; |
|
|
/* |
________________________________________________________________________________________________________________________________________ |
|
Structure of the VolumeBootRecord |
________________________________________________________________________________________________________________________________________ |
|
The Volume Boot Record is 512 bytes long |
This information is located in the first sector of every partition. |
*/ |
typedef struct |
{ |
u8 JumpCode[3]; // Jump Code + NOP |
s8 OEMName[8]; // OEM Name |
u16 BytesPerSector; // Bytes Per Sector |
u8 SectorsPerCluster; // Sectors Per Cluster |
u16 ReservedSectors; // Reserved Sectors |
u8 NoFATCopies; // Number of Copies of FAT |
u16 MaxRootEntries; // Maximum Root Directory Entries |
u16 NoSectorsInPartSml32MB; // Number of Sectors in Partition Smaller than 32 MB |
u8 MediaDescriptor; // Media Descriptor (0xF8 for Hard Disks) |
u16 SectorsPerFAT; // Sectors Per FAT |
u16 SectorsPerTrack; // Sectors Per Track |
u16 NoHeads; // Number of Heads |
u32 NoHiddenSectors; // Number of Hidden Sectors in Partition |
u32 NoSectors; // Number of Sectors in Partition |
u16 DriveNo; // Logical Drive Number of Partition |
u8 ExtendedSig; // Extended Signature (0x29) |
u32 SerialNo; // Serial Number of the Partition |
s8 VolumeName[11]; // Volume Name of the Partititon |
s8 FATName[8]; // FAT Name (FAT16) |
u8 ExecutableCode[446]; // 446 bytes for machine start code |
u16 ExecutableMarker; // Executable Marker (0x55 0xAA) |
} __attribute__((packed)) VBR_Entry_t; |
|
|
|
/* |
________________________________________________________________________________________________________________________________________ |
|
Structure of an directory entry |
________________________________________________________________________________________________________________________________________ |
|
Directory entry is 32 bytes. |
*/ |
typedef struct |
{ |
s8 Name[8]; // 8 bytes name, padded with spaces. |
u8 Extension[3]; // 3 bytes extension, padded with spaces. |
u8 Attribute; // attribute of the directory entry (unused,archive,read-only,system,directory,volume) |
u8 Res1; // should be zero |
u8 CreationTime10ms; // subsecond resolution of creation time |
u16 CreationTime; // Time of creation h:m:s |
u16 CreationDate; // Date of creation Y.M.D |
u16 LastAccessDate; // The date where the file was last accessed |
u8 Res2[2]; // should be zero |
u16 ModTime; // date of last write access |
u16 ModDate; // date of last write access to the file or directory. |
u16 StartCluster; // first cluster of the file or directory. |
u32 Size; // size of the file or directory in bytes. |
} __attribute__((packed)) DirEntry_t; |
|
#define SLOT_EMPTY 0x00 // slot has never been used |
#define SLOT_E5 0x05 // the real value is 0xe5 |
#define SLOT_DELETED 0xE5 // file in this slot deleted |
|
#define ATTR_NONE 0x00 // normal file |
#define ATTR_READONLY 0x01 // file is readonly |
#define ATTR_HIDDEN 0x02 // file is hidden |
#define ATTR_SYSTEM 0x04 // file is a system file |
#define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
#define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
#define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
#define ATTR_ARCHIVE 0x20 // file is new or modified |
|
|
/* |
________________________________________________________________________________________________________________________________________ |
|
Structure of an entry within the fileallocationtable. |
________________________________________________________________________________________________________________________________________ |
*/ |
typedef struct |
{ |
u16 NextCluster; // the next cluster of the file. |
} __attribute__((packed)) Fat16Entry_t; |
|
// secial fat entries |
#define FAT16_CLUSTER_FREE 0x0000 |
#define FAT16_CLUSTER_RESERVED 0x0001 |
#define FAT16_CLUSTER_USED_MIN 0x0002 |
#define FAT16_CLUSTER_USED_MAX 0xFFEF |
#define FAT16_CLUSTER_ROOTDIR_MIN 0xFFF0 |
#define FAT16_CLUSTER_ROOTDIR_MAX 0xFFF6 |
#define FAT16_CLUSTER_BAD 0xFFF7 |
#define FAT16_CLUSTER_LAST_MIN 0xFFF8 |
#define FAT16_CLUSTER_LAST_MAX 0xFFFF |
|
/*****************************************************************************************************************************************/ |
/* */ |
/* Global variables needed for read- or write-acces to the FAT16- filesystem. */ |
/* */ |
/*****************************************************************************************************************************************/ |
|
#define MBR_SECTOR 0x00 // the masterboot record is located in sector 0. |
#define DIRENTRY_SIZE 32 //bytes |
#define DIRENTRIES_PER_SECTOR BYTES_PER_SECTOR/DIRENTRY_SIZE |
#define FAT16_BYTES 2 |
#define FAT16_ENTRIES_PER_SECTOR BYTES_PER_SECTOR/FAT16_BYTES |
|
#define SECTOR_UNDEFINED 0x00000000L |
#define CLUSTER_UNDEFINED 0x0000 |
|
#define FSTATE_UNUSED 0 |
#define FSTATE_USED 1 |
|
typedef struct |
{ |
u8 IsValid; // 0 means invalid, else valid |
u8 SectorsPerCluster; // how many sectors does a cluster contain? |
u8 FatCopies; // Numbers of copies of the FAT |
u16 MaxRootEntries; // Possible number of entries in the root directory. |
u16 SectorsPerFat; // how many sectors does a fat16 contain? |
u32 FirstFatSector; // sector of the start of the fat |
u32 FirstRootDirSector; // sector of the rootdirectory |
u32 FirstDataSector; // sector of the first cluster containing data (cluster2). |
u32 LastDataSector; // the last data sector of the partition |
u8 VolumeLabel[12]; // the volume label |
u32 CurrentWorkingDirectory;// A pointer to the directory we are actual using |
s8 PathToCwd[256]; // a string containing the complete path to the current working directory |
} __attribute__((packed)) Partition_t; |
|
Partition_t Partition; // Structure holds partition information |
|
File_t FilePointer[FILE_MAX_OPEN]; // Allocate Memmoryspace for each filepointer used. |
|
|
|
|
/****************************************************************************************************************************************/ |
/* Function: FileDate(DateTime_t *); */ |
/* */ |
/* Description: This function calculates the DOS date from a pointer to a time structure. */ |
/* */ |
/* Returnvalue: Returns the DOS date. */ |
/****************************************************************************************************************************************/ |
u16 FileDate(DateTime_t * pTimeStruct) |
{ |
u16 date = 0; |
if(pTimeStruct == NULL) return date; |
if(!(pTimeStruct->Valid)) return date; |
|
date |= (0x007F & (u16)(pTimeStruct->Year - 1980))<<9; // set year |
date |= (0x000F & (u16)(pTimeStruct->Month))<<5; // set month |
date |= (0x001F & (u16)(pTimeStruct->Day)); |
return date; |
} |
|
/****************************************************************************************************************************************/ |
/* Function: FileTime(DateTime_t *); */ |
/* */ |
/* Description: This function calculates the DOS time from a pointer to a time structure. */ |
/* */ |
/* Returnvalue: Returns the DOS time. */ |
/****************************************************************************************************************************************/ |
|
u16 FileTime(DateTime_t * pTimeStruct) |
{ |
u16 time = 0; |
if(pTimeStruct == NULL) return time; |
if(!(pTimeStruct->Valid)) return time; |
|
time |= (0x001F & (u16)(pTimeStruct->Hour))<<11; |
time |= (0x003F & (u16)(pTimeStruct->Min))<<5; |
time |= (0x001F & (u16)(pTimeStruct->Sec/2)); |
return time; |
} |
|
/****************************************************************************************************************************************/ |
/* Function: LockFilePointer(); */ |
/* */ |
/* Description: This function trys to lock a free file pointer. */ |
/* */ |
/* Returnvalue: Returns the Filepointer on success or 0. */ |
/****************************************************************************************************************************************/ |
File_t * LockFilePointer(void) |
{ |
u8 i; |
File_t * File = 0; |
for(i = 0; i < FILE_MAX_OPEN; i++) |
{ |
if(FilePointer[i].State == FSTATE_UNUSED) // found an unused one |
{ |
File = &FilePointer[i]; // set pointer to that entry |
FilePointer[i].State = FSTATE_USED; // mark it as used |
break; |
} |
} |
return(File); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: UnlockFilePointer(file_t *); */ |
/* */ |
/* Description: This function trys to unlock a file pointer. */ |
/* */ |
/* Returnvalue: Returns 1 if file pointer was freed else 0. */ |
/****************************************************************************************************************************************/ |
u8 UnlockFilePointer(File_t * file) |
{ |
u8 cnt; |
if(file == NULL) return(0); |
for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
{ |
if(&FilePointer[cnt] == file) // filepointer to be freed found? |
{ |
file->State = FSTATE_UNUSED; |
file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
file->Mode = 0; // mode of fileoperation (read,write) |
file->Size = 0; // the size of the opend file in bytes. |
file->Position = 0; // pointer to a character within the file 0 < fileposition < filesize |
file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
file->Attribute = 0; // the attribute of the file opened. |
file = NULL; |
return(1); |
} |
} |
return(0); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: SeperateDirName(s8*, s8*); */ |
/* */ |
/* Description: This function seperates the first dirname from filepath and brings them */ |
/* into the needed format ('test.txt' -> 'TEST TXT') */ |
/* The subpath is the pointer to the remaining substring of the filepath */ |
/* */ |
/* Returnvalue: Return NULL on error or pointer to subpath */ |
/****************************************************************************************************************************************/ |
s8* SeperateDirName(const s8 *filepath, s8 *dirname) |
{ |
s8* subpath = NULL; |
u8 readpointer = 0; |
u8 writepointer = 0; |
|
// search subpath from beginning of filepath |
subpath = NULL; |
readpointer = 0; |
if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
while(subpath == NULL) // search the filepath until a subpath was found. |
{ |
if(((filepath[readpointer] == 0) || (filepath[readpointer] == '/'))) // if '/' found or end of filepath reached |
{ |
subpath = (s8*)&filepath[readpointer]; // store the position of the first "/" found after the beginning of the filenpath |
} |
readpointer++; |
} |
|
// clear dirname with spaces |
dirname[11] = 0; // terminate dirname |
for(writepointer = 0; writepointer < 11; writepointer++) dirname[writepointer] = ' '; |
|
// handle the special dirnames "." and ".." seperately |
readpointer = 0; |
if(filepath[0] == '/') readpointer++; |
// if we are trying to enter directories "." or ".." |
if(filepath[readpointer] == '.') |
{ |
// directory '.' |
if(filepath[readpointer+1] == 0) |
{ |
dirname[0] = '.'; |
return((s8*)&filepath[readpointer]); |
} |
// directory '..' |
if((filepath[readpointer+1] == '.') && (filepath[readpointer+2] == 0)) |
{ |
dirname[0] = '.'; |
dirname[1] = '.'; |
return((s8*)&filepath[readpointer]); |
} |
} |
|
writepointer = 0; |
// start seperating the dirname from the filepath. |
readpointer = 0; |
if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
while( &filepath[readpointer] < subpath) |
{ |
if(writepointer >= 11) return(NULL); // dirname to long |
if(filepath[readpointer] == '.') // seperating dirname and extension. |
{ |
if(writepointer <= 8) |
{ |
readpointer++; // next character in filename |
writepointer = 8; // jump to start of extension |
} |
else return(NULL); // dirbasename to long |
} |
else |
{ |
if((0x60 < filepath[readpointer]) && (filepath[readpointer] < 0x7B)) |
{ |
dirname[writepointer] = (filepath[readpointer] - 0x20); // all characters must be upper case. |
} |
else |
{ |
dirname[writepointer] = filepath[readpointer]; |
} |
readpointer++; |
writepointer++; |
} |
} |
return(subpath); |
} |
|
|
/**************************************************************************************************************************************+*/ |
/* Function: Fat16ClusterToSector( u16 cluster); */ |
/* */ |
/* Description: This function converts a cluster number given by the fat to the corresponding */ |
/* sector that points to the start of the data area that is represented by the cluster number. */ |
/* */ |
/* Returnvalue: The sector number with the data area of the given cluster */ |
/****************************************************************************************************************************************/ |
u32 Fat16ClusterToSector(u16 cluster) |
{ |
if(!Partition.IsValid) return SECTOR_UNDEFINED; |
if ((cluster < 2) || (cluster == CLUSTER_UNDEFINED)) |
{ |
return SECTOR_UNDEFINED; |
} |
else |
{ |
return ( (cluster - 2) * Partition.SectorsPerCluster) + Partition.FirstDataSector; // the first data sector is represented by the 2nd cluster |
} |
} |
|
/****************************************************************************************************************************************/ |
/* Function: SectorToFat16Cluster( u32 sector); */ |
/* */ |
/* Description: This function converts a given sector number given to the corresponding */ |
/* cluster number in the fat that represents this data area. */ |
/* */ |
/* Returnvalue: The cluster number representing the data area of the sector. */ |
/****************************************************************************************************************************************/ |
u16 SectorToFat16Cluster(u32 sector) |
{ |
if(!Partition.IsValid) return CLUSTER_UNDEFINED; |
if((sector == SECTOR_UNDEFINED) || (sector < Partition.FirstDataSector)) return CLUSTER_UNDEFINED; |
else return ((u16)((sector - Partition.FirstDataSector) / Partition.SectorsPerCluster) + 2); |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: Fat16_IsValid(void); */ |
/* */ |
/* Description: This function return the Fat 16 filesystem state */ |
/* */ |
/* Returnvalue: The function returns "1" on success */ |
/****************************************************************************************************************************************/ |
u8 Fat16_IsValid(void) |
{ |
return(Partition.IsValid); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: Fat16_Deinit(void); */ |
/* */ |
/* Description: This function uninitializes the fat 16 api */ |
/* */ |
/* Returnvalue: The function returns "0" on success */ |
/****************************************************************************************************************************************/ |
u8 Fat16_Deinit(void) |
{ |
s16 returnvalue = 0; |
u8 cnt; |
|
UART1_PutString("\r\n FAT16 deinit..."); |
// declare the filepointers as unused. |
for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
{ |
UnlockFilePointer(&FilePointer[cnt]); |
} |
returnvalue = SDC_Deinit(); // uninitialize interface to sd-card |
Partition.IsValid = 0; // mark data in partition structure as invalid |
Partition.VolumeLabel[0]='\0'; |
UART1_PutString("ok"); |
if(SD_WatchDog > 2000) SD_WatchDog = 2000; |
SD_LoggingError = 100; |
return(returnvalue); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: Fat16_Init(void); */ |
/* */ |
/* Description: This function reads the Masterbootrecord and finds the position of the Volumebootrecord, the FAT and the Rootdir */ |
/* and stores the information in global variables. */ |
/* */ |
/* Returnvalue: The function returns "0" if the filesystem is initialized. */ |
/****************************************************************************************************************************************/ |
u8 Fat16_Init(void) |
{ |
u8 cnt = 0; |
u32 partitionfirstsector; |
VBR_Entry_t *VBR; |
MBR_Entry_t *MBR; |
File_t *file; |
u8 result = 0; |
|
UART1_PutString("\r\n FAT16 init..."); |
Partition.IsValid = 0; |
// declare the filepointers as unused. |
for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
{ |
UnlockFilePointer(&FilePointer[cnt]); |
} |
// set current file pinter to first position in list |
file = &FilePointer[0]; |
|
// try to initialize the sd-card. |
if(SD_SUCCESS != SDC_Init()) |
{ |
UART1_PutString("SD-Card could not be initialized."); |
result = 1; |
goto end; |
} |
|
// SD-Card is initialized successfully |
if(SD_SUCCESS != SDC_GetSector((u32)MBR_SECTOR,file->Cache)) // Read the MasterBootRecord |
{ |
UART1_PutString("Error reading the MBR."); |
result = 2; |
goto end; |
} |
MBR = (MBR_Entry_t *)file->Cache; // Enter the MBR using the structure MBR_Entry_t. |
if((MBR->PartitionEntry1.Type == PART_TYPE_FAT16_ST_32_MB) || |
(MBR->PartitionEntry1.Type == PART_TYPE_FAT16_LT_32_MB) || |
(MBR->PartitionEntry1.Type == PART_TYPE_FAT16LBA)) |
{ |
// get sector offset 1st partition |
partitionfirstsector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
// Start of Partition is the Volume Boot Sector |
if(SD_SUCCESS != SDC_GetSector(partitionfirstsector,file->Cache)) // Read the volume boot record |
{ |
UART1_PutString("Error reading the VBR."); |
result = 3; |
goto end; |
} |
} |
else // maybe the medium has no partition assuming sector 0 is the vbr |
{ |
partitionfirstsector = 0; |
} |
|
VBR = (VBR_Entry_t *) file->Cache; // Enter the VBR using the structure VBR_Entry_t. |
if(VBR->BytesPerSector != BYTES_PER_SECTOR) |
{ |
UART1_PutString("VBR: Sector size not supported."); |
result = 4; |
goto end; |
} |
Partition.SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
Partition.FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
Partition.MaxRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
Partition.SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT // copy volume label |
Partition.VolumeLabel[0] = '\0'; // set string terminator |
|
/* Calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. */ |
// Calculate the position of the FileAllocationTable: |
// Start + # of Reserved Sectors |
Partition.FirstFatSector = (u32)(partitionfirstsector + (u32)(VBR->ReservedSectors)); |
// Calculate the position of the Rootdirectory: |
// Start + # of Reserved Sectors + (# of Sectors Per FAT * # of FAT Copies) |
Partition.FirstRootDirSector = Partition.FirstFatSector + (u32)((u32)Partition.SectorsPerFat*(u32)Partition.FatCopies); |
// Calculate the position of the first datacluster: |
// Start + # of Reserved + (# of Sectors Per FAT * # of FAT Copies) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
Partition.FirstDataSector = Partition.FirstRootDirSector + (u32)(Partition.MaxRootEntries>>4); // assuming 512 Byte Per Sector |
// Calculate the last data sector |
if(VBR->NoSectors == 0) |
{ |
UART1_PutString("VBR: Bad number of sectors."); |
result = 5; |
goto end; |
} |
Partition.LastDataSector = Partition.FirstDataSector + VBR->NoSectors - 1; |
// check for FAT16 in VBR of first partition |
if(!((VBR->FATName[0]=='F') && (VBR->FATName[1]=='A') && (VBR->FATName[2]=='T') && (VBR->FATName[3]=='1')&&(VBR->FATName[4]=='6'))) |
{ |
UART1_PutString("VBR: Partition ist not FAT16 type."); |
result = 6; |
goto end; |
} |
Partition.IsValid = 1; // mark data in partition structure as valid |
Partition.CurrentWorkingDirectory = Partition.FirstRootDirSector; |
strcpy(Partition.PathToCwd,"/"); |
result = 0; |
end: |
if(result != 0) Fat16_Deinit(); |
else UART1_PutString("ok"); |
return(result); |
} |
|
|
|
/****************************************************************************************************************************************/ |
/* Function: ClearCurrCluster(File_t*); */ |
/* */ |
/* Description: This function fills the current cluster with 0. */ |
/* */ |
/* Returnvalue: The function returns 1 on success else 0. */ |
/****************************************************************************************************************************************/ |
u8 ClearCurrCluster(File_t * file) |
{ |
u8 retvalue = 1; |
u32 i; |
|
if((!Partition.IsValid) || (file == NULL)) return(0); |
|
for(i = 0; i < BYTES_PER_SECTOR; i++) file->Cache[i] = 0; // clear file cache |
if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return (0); // nothing to do |
for(i = 0; i < Partition.SectorsPerCluster; i++) |
{ |
file->SectorInCache = file->FirstSectorOfCurrCluster + i; |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
{ |
Fat16_Deinit(); |
return(0); |
} |
} |
return(retvalue); |
} |
|
/*****************************************************************************************************************************************/ |
/* Function: GetNextCluster(File_t* ); */ |
/* */ |
/* Description: This function finds the next datacluster of the file specified with File *File. */ |
/* */ |
/* Returnvalue: The function returns the next cluster or 0 if the last cluster has already reached. */ |
/*****************************************************************************************************************************************/ |
u16 GetNextCluster(File_t * file) |
{ |
u16 cluster = CLUSTER_UNDEFINED; |
u32 fat_byte_offset, sector, byte; |
Fat16Entry_t * fat; |
|
if((!Partition.IsValid) || (file == NULL)) return(cluster); |
if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(cluster); |
// if sector is within the data area |
if((Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)&& (file->FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
{ |
// determine current file cluster |
cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); |
// calculate byte offset in the fat for corresponding entry |
fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
// calculate the sector that contains the current cluster within the fat |
sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
// calculate byte offset of the current cluster within that fat sector |
byte = fat_byte_offset % BYTES_PER_SECTOR; |
// read this sector to the file cache |
if(file->SectorInCache != sector) |
{ |
file->SectorInCache = sector; // update sector stored in buffer |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
{ |
Fat16_Deinit(); |
return (CLUSTER_UNDEFINED); |
} |
} |
// read the next cluster from cache |
fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
cluster = fat->NextCluster; |
// if no next cluster exist |
if(FAT16_CLUSTER_LAST_MIN <= cluster) |
{ |
cluster = CLUSTER_UNDEFINED; // next cluster is undefined |
} |
else |
{ |
file->FirstSectorOfCurrCluster = Fat16ClusterToSector(cluster); |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
} |
} |
return(cluster); |
} |
|
|
|
/****************************************************************************************************************************************/ |
/* Function: FindNextFreeCluster(File_t *); */ |
/* */ |
/* Description: This function looks in the fat to find the next free cluster */ |
/* */ |
/* Returnvalue: The function returns the cluster number of the next free cluster found within the fat. */ |
/****************************************************************************************************************************************/ |
u16 FindNextFreeCluster(File_t *file) |
{ |
u32 fat_sector; // current sector within the fat relative to the first sector of the fat. |
u32 curr_sector; // current sector |
u16 fat_entry; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
u16 free_cluster = CLUSTER_UNDEFINED; // next free cluster number. |
Fat16Entry_t * fat; |
|
if((!Partition.IsValid) || (file == NULL)) return(0); |
|
// start searching for an empty cluster at the beginning of the fat. |
fat_sector = 0; |
do |
{ |
curr_sector = Partition.FirstFatSector + fat_sector; // calculate sector to read |
file->SectorInCache = curr_sector; // upate the sector number of file cache. |
if( SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector of fat from sd-card. |
{ |
Fat16_Deinit(); |
return(CLUSTER_UNDEFINED); |
} |
|
fat = (Fat16Entry_t *)file->Cache; // set fat pointer to file cache |
|
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. |
{ |
if(fat[fat_entry].NextCluster == FAT16_CLUSTER_FREE) // empty cluster found!! |
{ |
fat[fat_entry].NextCluster = FAT16_CLUSTER_LAST_MAX; // mark this fat-entry as used |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // and save the sector at the sd-card. |
{ |
Fat16_Deinit(); |
return(CLUSTER_UNDEFINED); |
} |
free_cluster = (u16)(fat_sector * FAT16_ENTRIES_PER_SECTOR + (u32)fat_entry); |
fat_entry = FAT16_ENTRIES_PER_SECTOR; // terminate the search for a free cluster in this sector. |
} |
} |
fat_sector++; // continue the search in next fat sector |
// repeat until the end of the fat is reached and no free cluster has been found so far |
}while((fat_sector < Partition.SectorsPerFat) && (!free_cluster)); |
return(free_cluster); |
} |
|
|
/****************************************************************************************************************************************************/ |
/* Function: s16 fseek_(File_t *, s32 *, u8) */ |
/* */ |
/* Description: This function sets the pointer of the stream relative to the position */ |
/* specified by origin (SEEK_SET, SEEK_CUR, SEEK_END) */ |
/* Returnvalue: Is 0 if seek was successful */ |
/****************************************************************************************************************************************************/ |
s16 fseek_(File_t *file, s32 offset, s16 origin) |
{ |
s32 fposition = 0; |
s16 retvalue = 1; |
|
// the byteindex within a sector |
u32 byte_index = 0; |
// the sectorindex within a cluster |
u32 sector_index = 0; |
// the index of the cluster within the clusterchain inside the fat |
u32 cluster_index = 0; |
|
// check if the partition is valid |
if((!Partition.IsValid) || (file == NULL)) return(retvalue); |
//...................................................... |
if(origin == SEEK_SET) // Fileposition relative to the beginning of the file. |
{ |
fposition = 0; |
} |
//...................................................... |
else if(origin == SEEK_END) // Fileposition relative to the end of the file. |
{ |
fposition = (s32) file->Size; |
} |
//...................................................... |
else if(origin == SEEK_CUR) // Fileposition relative to the current position of the file. |
{ |
fposition = (s32)file->Position; |
} |
|
// calculate the specified fileposition according to the selected mode |
fposition += offset; // Die Absolute Dateiposition welche durch fseek angesprungen werden soll. |
// is the fileposition within the file? |
if((fposition >= 0) && (fposition <= (s32)file->Size)) // Ist die berechnete Dateiposition innerhalb der geöffneten Datei? |
{ |
// initialize the filepointer |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
file->Position = 0; |
// has the specified file at least one valid sector attached? |
if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(retvalue); |
// calculate the absolute number of the sector wich contains the fileposition we are looking for |
sector_index = (u32) ((u32)fposition >> 9); |
// calculate the index of the cluster containing the specified sector |
cluster_index = (u32) sector_index / Partition.SectorsPerCluster; |
// the absolute sectornumber becomes relative to the beginning of the specified cluster |
sector_index = (sector_index % Partition.SectorsPerCluster); |
// calculate the index of the byteposition the fileposition points to |
byte_index = (u32) fposition % 512; |
// parse the fat till the calculated cluster has been reached |
while(cluster_index--) GetNextCluster(file); |
// set the filepointer to the specified sector and byteposition |
file->SectorOfCurrCluster = (u8) sector_index; |
file->ByteOfCurrSector = (u16) byte_index; |
// the fileposition now equals the filepointer |
file->Position = (u32)fposition; |
// the specified fileposition has been reached |
retvalue = 0; |
} |
return(retvalue); |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: u16 DeleteClusterChain(File *file); */ |
/* */ |
/* Description: This function trances along a cluster chain in the fat and frees all clusters visited. */ |
/* */ |
/****************************************************************************************************************************************/ |
u8 DeleteClusterChain(u16 StartCluster) |
{ |
u16 cluster; |
u32 fat_byte_offset, sector, byte; |
Fat16Entry_t * fat; |
u8 buffer[BYTES_PER_SECTOR]; |
u32 sector_in_buffer = 0; |
u8 repeat = 0; |
|
if(!Partition.IsValid) return(0); |
if(StartCluster == CLUSTER_UNDEFINED) return(0); |
cluster = StartCluster; // init chain trace |
// if start cluster is no real cluster |
if(FAT16_CLUSTER_LAST_MIN <= cluster) return 1; |
|
// calculate byte offset in the fat for corresponding entry |
fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
// calculate the sector that contains the current cluster within the fat |
sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
// calculate byte offset of the current cluster within that fat sector |
byte = fat_byte_offset % BYTES_PER_SECTOR; |
do |
{ |
if(sector != sector_in_buffer) |
{ |
// read this sector to buffer |
sector_in_buffer = sector; |
if(SD_SUCCESS != SDC_GetSector(sector_in_buffer, buffer)) return 0; // read sector from sd-card |
} |
// read the next cluster from cache |
fat = (Fat16Entry_t *)(&(buffer[byte])); |
cluster = fat->NextCluster; |
fat->NextCluster = FAT16_CLUSTER_FREE; // mark current cluster as free |
|
if((FAT16_CLUSTER_USED_MIN <= cluster) && (cluster <= FAT16_CLUSTER_USED_MAX) ) |
{ |
repeat = 1; |
// calculate sector byte and byte offset in the fat for the next cluster |
fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
// calculate the sector that contains the current cluster within the fat |
sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
// calculate byte offset of the current cluster within that fat sector |
byte = fat_byte_offset % BYTES_PER_SECTOR; |
} |
else repeat = 0; |
|
// if new sector is not the sector in buffer or the last cluster in the chain was traced |
if((sector != sector_in_buffer) || !repeat) |
{ // write sector in buffer |
if(SD_SUCCESS != SDC_PutSector(sector_in_buffer,buffer)) |
{ |
Fat16_Deinit(); |
return(0); |
} |
} |
} |
while(repeat); |
|
return 1; |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: u16 AppendCluster(File *file); */ |
/* */ |
/* Description: This function looks in the fat to find the next free cluster and appends it to the file. */ |
/* */ |
/* Returnvalue: The function returns the appened cluster number or CLUSTER_UNDEFINED of no cluster was appended. */ |
/****************************************************************************************************************************************/ |
|
u16 AppendCluster(File_t *file) |
{ |
u16 last_cluster, new_cluster = CLUSTER_UNDEFINED; |
u32 fat_byte_offset, sector, byte; |
Fat16Entry_t * fat; |
|
if((!Partition.IsValid) || (file == NULL)) return(new_cluster); |
|
new_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
if(new_cluster != CLUSTER_UNDEFINED) |
{ // A free cluster was found and can be added to the end of the file. |
fseek_(file, 0, SEEK_END); // jump to the end of the file |
last_cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); // determine current file cluster |
if(last_cluster != CLUSTER_UNDEFINED) |
{ |
// update FAT entry of last cluster |
fat_byte_offset = ((u32)last_cluster)<<1; |
sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
byte = fat_byte_offset % BYTES_PER_SECTOR; |
// read the sector containing the last cluster of the file |
if(file->SectorInCache != sector) |
{ |
file->SectorInCache = sector; // update sector stored in buffer |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
{ |
Fat16_Deinit(); |
return(0); |
} |
} |
fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
fat->NextCluster = new_cluster; // append the free cluster to the end of the file in the FAT. |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // save the modified sector to the FAT. |
{ |
Fat16_Deinit(); |
return(0); |
} |
} |
else // last cluster of the file is undefined |
{ // then the new cluster must be the first one of the file |
// and its cluster number must be set in the direntry |
DirEntry_t * dir; |
file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(CLUSTER_UNDEFINED); |
} |
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
dir[file->DirectoryIndex].Res1 = 0; |
dir[file->DirectoryIndex].Res2[0] = 0; |
dir[file->DirectoryIndex].Res2[1] = 0; |
dir[file->DirectoryIndex].StartCluster = new_cluster; // update startcluster |
dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime);// set time |
dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime);// and date of modification |
dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
dir[file->DirectoryIndex].Size = 0; |
// write sector containing the direntry |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
{ |
Fat16_Deinit(); |
return(CLUSTER_UNDEFINED); |
} |
// update file info |
file->FirstSectorOfFirstCluster = Fat16ClusterToSector(new_cluster); |
file->Size = 0; |
file->Position = 0; |
} |
// update file pointes |
file->FirstSectorOfCurrCluster = Fat16ClusterToSector(new_cluster); |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
} |
return(new_cluster); |
} |
|
|
/****************************************************************************************************************************************************/ |
/* Function: DirectoryEntryExist(s8 *, u8, u8, File_t *) */ |
/* */ |
/* Description: This function searches all possible dir entries until the file or directory is found or the end of the directory is reached */ |
/* */ |
/* Returnvalue: This function returns 1 if the directory entry specified was found. */ |
/****************************************************************************************************************************************************/ |
u8 DirectoryEntryExist(s8 *dirname, u8 attribfilter, u8 attribmask, File_t *file) |
{ |
u32 dir_sector, max_dir_sector, curr_sector; |
u16 dir_entry = 0; |
|
u16 end_of_directory_not_reached = 0; |
u8 i = 0; |
u8 direntry_exist = 0; |
DirEntry_t * dir; |
|
// if incomming pointers are useless return immediatly |
if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return(direntry_exist); |
|
// dir entries can be searched only in filesclusters that have |
// a corresponding dir entry with adir-flag set in its attribute |
// or direct within the root directory area |
file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
// no current directory exist therefore assume searching in the root |
if(file->DirectorySector == SECTOR_UNDEFINED) |
{ |
max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
} |
// within the root directory area we can read sectors sequentially until the end of this area |
else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
{ |
max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
} |
// within the data clusters we can read sectors sequentially only within the cluster |
else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
{ |
max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
} |
else return (direntry_exist); // bad sector range for directory sector of the file |
// if search area is not defined yet |
if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
{ |
// check if the directory entry of current file is existent and has the dir-flag set |
file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(0); |
} |
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
{ |
case SLOT_EMPTY: |
case SLOT_DELETED: |
// the directrory pointer of this file points to a deleted or not existen directory |
// therefore no file or subdirectory can be created |
return (direntry_exist); |
break; |
default: // and is a real directory |
if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
{ // current file is not a directory therefore no file or subdirectory can be created here |
return (direntry_exist); |
} |
break; |
} |
file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[file->DirectoryIndex].StartCluster); |
} |
|
// update current file data area position to start of first cluster |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
|
do // loop over all data clusters of the current directory entry |
{ |
dir_sector = 0; |
do // loop over all sectors of a cluster or all sectors of the root directory |
{ |
curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
file->SectorInCache = curr_sector; // upate the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
{ |
Fat16_Deinit(); |
return(0); |
} |
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
// search all directory entries within that sector |
for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
{ // check for existing dir entry |
switch((u8)dir[dir_entry].Name[0]) |
{ |
case SLOT_EMPTY: |
case SLOT_DELETED: |
// ignore empty or deleted dir entries |
break; |
default: |
// if existing check attributes before names are compared will safe performance |
if ((dir[dir_entry].Attribute & attribmask) != attribfilter) break; // attribute must match |
// then compare the name to the giveb dirname (first 11 characters include 8 chars of basename and 3 chars extension.) |
i = 0; |
while((i < 11) && (dir[dir_entry].Name[i] == dirname[i])) i++; |
if (i < 10) break; // names does not match |
// if dirname and attribute have matched |
file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
file->DirectorySector = curr_sector; // current sector |
file->DirectoryIndex = dir_entry; // current direntry in current sector |
file->Size = dir[dir_entry].Size; |
direntry_exist = 1; // mark as found |
dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
} // end of first byte of name check |
} |
dir_sector++; // search next sector |
// stop if we reached the end of the cluster or the end of the root dir |
}while((dir_sector < max_dir_sector) && (!direntry_exist)); |
|
// if we are seaching in the data area and the file not found in this cluster so take next cluster. |
if(!direntry_exist && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
{ |
end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
} |
}while((end_of_directory_not_reached) && (!direntry_exist)); // repeat until a next cluster exist an no |
return(direntry_exist); |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: CreateDirectoryEntry(s8 *, u16, File_t *) */ |
/* */ |
/* Description: This function looks for the next free position in the directory and creates an entry. */ |
/* The type of an directory entry is specified by the file attribute. */ |
/* */ |
/* Returnvalue: Return 0 on error */ |
/****************************************************************************************************************************************/ |
u8 CreateDirectoryEntry(s8 *dirname, u8 attrib, File_t *file) |
{ |
u32 dir_sector, max_dir_sector, curr_sector; |
u16 dir_entry = 0; |
u16 subdircluster, dircluster = 0; |
u16 end_of_directory_not_reached = 0; |
u8 i = 0; |
u8 retvalue = 0; |
DirEntry_t *dir; |
|
if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return (retvalue); |
// It is not checked here that the dir entry that should be created is already existent! |
|
// Dir entries can be created only in file-clusters that have |
// the dir-flag set in its attribute or within the root directory |
|
file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
// no current directory exist therefore assume creating in the root |
if(file->DirectorySector == SECTOR_UNDEFINED) |
{ |
max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
dircluster = 0; |
file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
} |
// within the root directory area we can read sectors sequentially until the end of this area |
else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
{ |
max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
} |
// within the data clusters we can read sectors sequentially only within the cluster |
else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
{ |
max_dir_sector = Partition.SectorsPerCluster; |
} |
else return (retvalue); // bad sector range for directory sector of the file |
// if search area is not defined yet |
if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
{ |
// check if the directory entry of current file is existent and has the dir-flag set |
file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(0); |
} |
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
{ |
case SLOT_EMPTY: |
case SLOT_DELETED: |
return (retvalue); |
break; |
default: // and is a real directory |
if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
{ // current file is not a directory therefore no file or subdirectory can be created here |
return (retvalue); |
} |
break; |
} |
dircluster = dir[file->DirectoryIndex].StartCluster; |
file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dircluster); |
} |
|
// if the new direntry is a subdirectory |
if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) |
{ // get a free clutser for its content |
subdircluster = FindNextFreeCluster(file); // get the next free cluster on the disk and mark it as used. |
} |
else // a normal file |
{ // has no data cluster after creation |
subdircluster = CLUSTER_UNDEFINED; |
} |
|
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
do // loop over all clusters of current directory |
{ |
dir_sector = 0; // reset sector counter within a new cluster |
do // loop over all sectors of a cluster or all sectors of the root directory |
{ |
curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
file->SectorInCache = curr_sector; // upate the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(0); |
} |
|
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
// search all directory entries of a sector |
for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
{ // check if current direntry is available |
if(((u8)dir[dir_entry].Name[0] == SLOT_EMPTY) || ((u8)dir[dir_entry].Name[0] == SLOT_DELETED)) |
{ // a free direntry was found |
for(i = 0; i < 11; i++) dir[dir_entry].Name[i] = dirname[i]; // Set dir name |
dir[dir_entry].Attribute = attrib; |
dir[dir_entry].Res1 = 0; |
dir[dir_entry].CreationTime10ms = (u8)(SystemTime.mSec/10); |
dir[dir_entry].CreationTime = FileTime(&SystemTime); |
dir[dir_entry].CreationDate = FileDate(&SystemTime); |
dir[dir_entry].LastAccessDate = dir[dir_entry].CreationDate; |
dir[dir_entry].Res2[0] = 0; |
dir[dir_entry].Res2[1] = 0; |
dir[dir_entry].ModTime = dir[dir_entry].CreationTime; |
dir[dir_entry].ModDate = dir[dir_entry].CreationDate; |
// Set the attribute of the new directoryentry. |
dir[dir_entry].StartCluster = subdircluster; // copy the location of the first datacluster to the directoryentry. |
dir[dir_entry].Size = 0; // the new createted file has no content yet. |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to card |
{ |
Fat16_Deinit(); |
return(0); |
} |
file->FirstSectorOfFirstCluster = Fat16ClusterToSector(subdircluster); // Calculate absolute sectorposition of first datacluster. |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; // Start reading the file with the first sector of the first datacluster. |
file->SectorOfCurrCluster = 0; // reset sector of cureen cluster |
file->ByteOfCurrSector = 0; // reset the byte location within the current sector |
file->Attribute = attrib; // set file attribute to dir attribute |
file->Size = 0; // new file has no size |
file->DirectorySector = curr_sector; |
file->DirectoryIndex = dir_entry; |
// prepare subdirectory data cluster |
if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) // if a new directory was created then initilize the data area |
{ |
ClearCurrCluster(file); // fill cluster with zeros |
file->SectorInCache = file->FirstSectorOfFirstCluster; |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(0); |
} |
dir = (DirEntry_t *)file->Cache; |
// create direntry "." to current dir |
dir[0].Name[0] = 0x2E; |
for(i = 1; i < 11; i++) dir[0].Name[i] = ' '; |
dir[0].Attribute = ATTR_SUBDIRECTORY; |
dir[0].StartCluster = subdircluster; |
dir[0].Size = 0; |
// create direntry ".." to the upper dir |
dir[1].Name[0] = 0x2E; |
dir[1].Name[1] = 0x2E; |
for(i = 2; i < 11; i++) dir[1].Name[i] = ' '; |
dir[1].Attribute = ATTR_SUBDIRECTORY; |
dir[1].StartCluster = dircluster; |
dir[1].Size = 0; |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(0); |
} |
} |
retvalue = 1; |
dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
} |
} |
dir_sector++; // search next sector |
// stop if we reached the end of the cluster or the end of the root dir |
}while((dir_sector < max_dir_sector) && (!retvalue)); |
|
// if we are seaching in the data area and the file not found in this cluster so take next cluster. |
if(!retvalue && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
{ |
end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
} |
}while((end_of_directory_not_reached) && (!retvalue)); |
// Perhaps we are at the end of the last cluster of a directory file and have no free direntry found. |
// Then we would need to add a cluster to that file and create the new direntry there. |
// This code is not implemented yet, because its occurs only if more that 32*32=1024 direntries are |
// within a subdirectory of root. |
|
return(retvalue); // return 1 if file has been created otherwise return 0. |
} |
|
/********************************************************************************************************************************************/ |
/* Function: FileExist(const s8* filename, u8 attribfilter, u8 attribmask, File_t *file); */ |
/* */ |
/* Description: This function looks for the specified file including its subdirectories beginning */ |
/* in the rootdirectory of the drive. If the file is found the Filepointer properties are */ |
/* updated. */ |
/* */ |
/* Returnvalue: 1 if file is found else 0. */ |
/********************************************************************************************************************************************/ |
u8 FileExist(const s8* filename, const u8 attribfilter, const u8 attribmask, File_t *file) |
{ |
s8* path = 0; |
s8* subpath = 0; |
u8 af, am, file_exist = 0; |
s8 dirname[12]; // 8+3 + temination character |
|
// if incomming pointers are useless return immediatly |
if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
|
// trace along the filepath |
path = (s8*)filename; // start a the beginning of the filename string |
file->DirectorySector = 0; // start at RootDirectory with file search |
file->DirectoryIndex = 0; |
/* if a path begins with a '/' at index 0 the search starts at the rootdirectory otherwise we will start relative to the cwd */ |
if(path[0] != '/') |
{ |
/* is the current working directory the rootdirectory? */ |
if(Partition.CurrentWorkingDirectory == Partition.FirstRootDirSector) file->DirectorySector = 0; |
/* otherwise we are working in an subdirectory */ |
else file->DirectorySector = Partition.CurrentWorkingDirectory; |
} |
// as long as the file was not found and the remaining path is not empty |
while((*path != 0) && !file_exist) |
{ // separate dirname and subpath from filepath string |
subpath = SeperateDirName(path, dirname); |
if(subpath != NULL) |
{ |
if(*subpath == 0) |
{ // empty subpath indicates last element of dir chain |
af = attribfilter; |
am = attribmask; |
} |
else // it must be a subdirectory and no volume label |
{ |
af = ATTR_SUBDIRECTORY; |
am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
} |
if(!DirectoryEntryExist(dirname, af, am, file)) |
{ |
return (file_exist); // subdirectory does not exist |
} |
else |
{ |
if (*subpath == 0) |
{ |
file_exist = 1; // last element of path chain was found with the given attribute filter |
} |
} |
} |
else // error seperating the subpath |
{ |
return file_exist; // bad subdir format |
} |
path = subpath; |
subpath = 0; |
} |
return (file_exist); |
} |
|
|
/********************************************************************************************************************************************/ |
/* Function: FileCreate(const s8* filename, u8 attrib, File_t *file); */ |
/* */ |
/* Description: This function looks for the specified file including its subdirectories beginning */ |
/* in the rootdirectory of the partition. If the file is found the Filepointer properties are */ |
/* updated. If file or its subdirectories are not found they will be created */ |
/* */ |
/* Returnvalue: 1 if file was created else 0. */ |
/********************************************************************************************************************************************/ |
u8 FileCreate(const s8* filename, const u8 attrib, File_t *file) |
{ |
s8 *path = 0; |
s8 *subpath = 0; |
u8 af, am, file_created = 0; |
s8 dirname[12]; |
|
// if incomming pointers are useless return immediatly |
if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
|
// trace along the filepath |
path = (s8*)filename; // start a the beginning of the filename string |
file->DirectorySector = 0; // start at RootDirectory with file search |
file->DirectoryIndex = 0; |
// as long as the file was not created and the remaining file path is not empty |
while((*path != 0) && !file_created) |
{ // separate dirname and subpath from filepath string |
subpath = SeperateDirName(path, dirname); |
if(subpath != NULL) |
{ |
if(*subpath == 0) |
{ // empty subpath indicates last element of dir chain |
af = ATTR_NONE; |
am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; // any file that is no subdir or volume label |
} |
else // it must be a subdirectory and no volume label |
{ |
af = ATTR_SUBDIRECTORY; |
am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
} |
if(!DirectoryEntryExist(dirname, af, am, file)) // if subdir or file is not existent |
{ // try to create subdir or file |
if(*subpath == 0) af = attrib; // if last element in dir chain take the given attribute |
if(!CreateDirectoryEntry(dirname, af, file)) |
{ // could not be created |
return(file_created); |
} |
else if (*subpath == 0) file_created = 1; // last element of path chain was created |
} |
} |
else // error seperating the subpath |
{ |
return file_created; // bad subdir format |
} |
path = subpath; |
subpath = 0; |
} |
return (file_created); |
} |
|
|
/********************************************************************************************************************************************/ |
/* Function: File_t * fopen_(s8* filename, s8 mode); */ |
/* */ |
/* Description: This function looks for the specified file in the rootdirectory of the drive. If the file is found the number of the */ |
/* corrosponding filepointer is returned. Only modes 'r' (reading) and 'a' append are implemented yet. */ |
/* */ |
/* Returnvalue: The filepointer to the file or 0 if faild. */ |
/********************************************************************************************************************************************/ |
File_t * fopen_(s8 * const filename, const s8 mode) |
{ |
File_t *file = 0; |
s8 *cptr; |
|
if((!Partition.IsValid) || (filename == 0)) return(file); |
|
// Look for an unused filepointer in the file pointer list? |
file = LockFilePointer(); |
// if no unused file pointer was found return 0 |
if(file == NULL) return(file); |
|
// now we have found a free filepointer and claimed it |
// so let initiate its property values |
file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
file->Mode = mode; // mode of fileoperation (read,write) |
file->Size = 0; // the size of the opened file in bytes. |
file->Position = 0; // pointer to a byte within the file 0 < fileposition < filesize |
file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
file->Attribute = 0; // the attribute of the file opened. |
|
// bring the path into the correct syntax |
cptr = filename; |
// search the whole string |
while(*cptr != 0) |
{ |
// replace all '\' by '/' |
if(*cptr == '\\') *cptr = '/'; |
cptr++; |
} |
// check if a real file (no directory) to the given filename exist |
if(FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file)) |
{ // file exist |
switch(mode) // check mode |
{ |
case 'a': // if mode is: append to file |
if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
{ // file is marked as readonly --> do not open this file |
fclose_(file); |
file = NULL; |
} |
else |
{ // file is not marked as read only --> goto end of file |
fseek_(file, 0, SEEK_END); // point to the end of the file |
} |
break; |
case 'w': // if mode is: write to file |
if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
{ // file is marked as readonly --> do not open this file |
fclose_(file); |
file = NULL; |
} |
else |
{ // file is not marked as read only |
DirEntry_t * dir; |
// free all clusters of that file |
DeleteClusterChain(SectorToFat16Cluster(file->FirstSectorOfFirstCluster)); |
// update directory entry of that file |
file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
{ |
Fat16_Deinit(); |
return(NULL); |
} |
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); // set modification time |
dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); // set modification date |
dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
dir[file->DirectoryIndex].StartCluster = CLUSTER_UNDEFINED; // update startcluster |
dir[file->DirectoryIndex].Size = 0; |
// write sector containing the direntry |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
{ |
Fat16_Deinit(); |
return(NULL); |
} |
file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
file->Size = 0; |
file->Position = 0; |
fseek_(file, 0, SEEK_SET); |
} |
break; |
case 'r': // if mode is: read from file |
// goto end of file |
fseek_(file, 0, SEEK_SET); |
break; |
default: // other modes are not supported |
fclose_(file); |
file = NULL; |
break; |
} |
return(file); |
} |
else // file does not exist |
{ |
switch(mode) // check mode |
{ |
case 'a': |
case 'w': // if mode is write or append |
// try to create the file |
if(!FileCreate(filename, ATTR_ARCHIVE, file)) |
{ // if it could not be created |
fclose_(file); |
file = NULL; |
} |
break; |
case 'r': // else opened for 'r' |
default: // if unsupported mode |
fclose_(file); |
file = NULL; |
break; |
} |
return(file); |
} |
// we should never come to this point |
fclose_(file); |
file = NULL; |
return(file); |
} |
|
/****************************************************************************************************************************************************/ |
/* Function: fflush_(File *); */ |
/* */ |
/* Description: This function writes the data already in the buffer but not yet written to the file. */ |
/* */ |
/* Returnvalue: 0 on success EOF on error */ |
/****************************************************************************************************************************************************/ |
s16 fflush_(File_t *file) |
{ |
DirEntry_t *dir; |
|
if((file == NULL) || (!Partition.IsValid)) return (EOF); |
|
switch(file->Mode) |
{ |
case 'a': |
case 'w': |
if(file->ByteOfCurrSector > 0) // has data been added to the file? |
{ |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// save the data still in the buffer |
{ |
Fat16_Deinit(); |
return(EOF); |
} |
} |
file->SectorInCache = file->DirectorySector; |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read the directory entry for this file. |
{ |
Fat16_Deinit(); |
return(EOF); |
} |
|
dir = (DirEntry_t *)file->Cache; |
// update file size and modification time & date |
dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); |
dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); |
dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
dir[file->DirectoryIndex].Size = file->Size; // update file size |
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to sd-card |
{ |
Fat16_Deinit(); |
return(EOF); |
} |
break; |
case 'r': |
default: |
// do nothing! |
return(EOF); |
break; |
|
} |
return(0); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: fclose_(File *file); */ |
/* */ |
/* Description: This function closes the open file by writing the remaining data */ |
/* from the buffer to the device and entering the filesize in the directory entry. */ |
/* */ |
/* Returnvalue: 0 on success EOF on error */ |
/****************************************************************************************************************************************/ |
s16 fclose_(File_t *file) |
{ |
s16 returnvalue = EOF; |
|
if(file == NULL) return(returnvalue); |
returnvalue = fflush_(file); |
UnlockFilePointer(file); |
return(returnvalue); |
} |
|
/********************************************************************************************************************************************/ |
/* Function: fgetc_(File *file); */ |
/* */ |
/* Description: This function reads and returns one character from the specified file. Is the end of the actual sector reached the */ |
/* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
/* */ |
/* Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. */ |
/********************************************************************************************************************************************/ |
s16 fgetc_(File_t *file) |
{ |
s16 c = EOF; |
u32 curr_sector; |
|
if( (!Partition.IsValid) || (file == NULL)) return(c); |
// if the end of the file is not reached, get the next character. |
if((0 < file->Size) && ((file->Position) < file->Size) ) |
{ |
curr_sector = file->FirstSectorOfCurrCluster; // calculate the sector of the next character to be read. |
curr_sector += file->SectorOfCurrCluster; |
|
if(file->SectorInCache != curr_sector) |
{ |
file->SectorInCache = curr_sector; |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache,file->Cache)) |
{ |
Fat16_Deinit(); |
return(EOF); |
} |
} |
c = (s16) file->Cache[file->ByteOfCurrSector]; |
file->Position++; // increment file position |
file->ByteOfCurrSector++; // goto next byte in sector |
if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if end of sector |
{ |
file->ByteOfCurrSector = 0; // reset byte location |
file->SectorOfCurrCluster++; // next sector |
if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
{ |
|
if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
{ |
file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
} |
else // the last cluster was allready reached |
{ |
file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
} |
} |
} |
} |
return(c); |
} |
|
/********************************************************************************************************************************************/ |
/* Function: fputc_( const s8 c, File *file); */ |
/* */ |
/* Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. */ |
/* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
/* */ |
/* Returnvalue: The function returns the character written to the stream or EOF on error. */ |
/********************************************************************************************************************************************/ |
s16 fputc_(const s8 c, File_t *file) |
{ |
u32 curr_sector = 0; |
|
if((!Partition.IsValid) || (file == NULL)) return(EOF); |
switch(file->Mode) |
{ |
case 'w': |
case 'a': |
// If file position equals to file size, then the end of file has been reached. |
// In this case it has to be checked that the ByteOfCurrSector is BYTES_PER_SECTOR |
// and a new cluster should be appended. |
// If the first sector of first cluster is unvalid, then the file claims no data clusters |
// and size should be zero, therefore append a new Cluster too. |
if(((file->Position >= file->Size) && (file->ByteOfCurrSector >= BYTES_PER_SECTOR)) || (file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED)) |
{ |
if(CLUSTER_UNDEFINED == AppendCluster(file)) return(EOF); |
} |
|
curr_sector = file->FirstSectorOfCurrCluster; |
curr_sector += file->SectorOfCurrCluster; |
if(file->SectorInCache != curr_sector) |
{ |
file->SectorInCache = curr_sector; |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) |
{ |
Fat16_Deinit(); |
return(EOF); |
} |
} |
|
file->Cache[file->ByteOfCurrSector] = (u8)c; // write databyte into the buffer. The byte will be written to the device at once |
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. |
file->Position++; // the actual positon within the file. |
file->ByteOfCurrSector++; // goto next byte in sector |
if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if the end of this sector is reached yet |
{ // save the sector to the sd-card |
|
if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
{ |
Fat16_Deinit(); |
return(EOF); |
} |
file->ByteOfCurrSector = 0; // reset byte location |
file->SectorOfCurrCluster++; // next sector |
if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster)// if end of cluster is reached, the next datacluster has to be searched in the FAT. |
{ |
if(!GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
{ // if current cluster was the last cluster of the file |
if(!AppendCluster(file)) // append a new and free cluster at the end of the file. |
{ |
file->SectorOfCurrCluster--; // jump back to last sector of last cluster |
file->ByteOfCurrSector = BYTES_PER_SECTOR; // set byte location to 1 byte over sector len |
return(EOF); |
} |
} |
else // next cluster |
{ |
file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
} |
} |
} |
break; |
case 'r': |
default: |
return(EOF); |
break; |
} // EOF switch(file->Mode) |
return(0); |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: fread_(void *buffer, s32 size, s32 count, File *File); */ |
/* */ |
/* Description: This function reads count objects of the specified size */ |
/* from the actual position of the file to the specified buffer. */ |
/* */ |
/* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
/****************************************************************************************************************************************/ |
u32 fread_(void *buffer, u32 size, u32 count, File_t *file) |
{ |
u32 object_cnt = 0; // count the number of objects read from the file. |
u32 object_size = 0; // count the number of bytes read from the actual object. |
u8 *pbuff = 0; // a pointer to the actual bufferposition. |
u8 success = 1; // no error occured during read operation to the file. |
s16 c; |
|
if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
|
pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
|
while((object_cnt < count) && success) |
{ |
object_size = size; |
while((size > 0) && success) |
{ |
c = fgetc_(file); |
if(c != EOF) |
{ |
*pbuff = (u8)c; // read a byte from the buffer to the opened file. |
pbuff++; |
size--; |
} |
else // error or end of file reached |
{ |
success = 0; |
} |
} |
if(success) object_cnt++; |
} |
return(object_cnt); // return the number of objects succesfully read from the file |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: fwrite_(void *buffer, s32 size, s32 count, File *file); */ |
/* */ |
/* Description: This function writes count objects of the specified size */ |
/* from the buffer pointer to the actual position in the file. */ |
/* */ |
/* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
/****************************************************************************************************************************************/ |
u32 fwrite_(void *buffer, u32 size, u32 count, File_t *file) |
{ |
u32 object_cnt = 0; // count the number of objects written to the file. |
u32 object_size = 0; // count the number of bytes written from the actual object. |
u8 *pbuff = 0; // a pointer to the actual bufferposition. |
u8 success = 1; // no error occured during write operation to the file. |
s16 c; |
|
if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
if(file->Mode == 'r') return (0); // opened read only |
pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
|
while((object_cnt < count) && success) |
{ |
object_size = size; |
while((size > 0) && success) |
{ |
c = fputc_(*pbuff, file); // write a byte from the buffer to the opened file. |
if(c != EOF) |
{ |
pbuff++; |
size--; |
} |
else |
{ |
success = 0; |
} |
} |
if(success) object_cnt++; |
} |
|
return(object_cnt); // return the number of objects succesfully written to the file |
} |
|
|
/****************************************************************************************************************************************/ |
/* Function: fputs_(const s8 *string, File_t *File); */ |
/* */ |
/* Description: This function writes a string to the specified file. */ |
/* */ |
/* Returnvalue: The function returns a no negative value or EOF on error. */ |
/****************************************************************************************************************************************/ |
s16 fputs_(s8 * const string, File_t * const file) |
{ |
u8 i=0; |
s16 c = 0; |
|
if((!Partition.IsValid) || (file == NULL) || (string == NULL)) return(EOF); |
if(file->Mode == 'r') return(EOF); |
while((string[i] != 0)&& (c != EOF)) |
{ |
c = fputc_(string[i], file); |
i++; |
} |
return(c); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: fgets_(s8 *, s16 , File_t *); */ |
/* */ |
/* Description: This function reads a string from the file to the specifies string. */ |
/* */ |
/* Returnvalue: A pointer to the string read from the file or 0 on error. */ |
/****************************************************************************************************************************************/ |
s8 * fgets_(s8 * const string, s16 const length, File_t * const file) |
{ |
s8 *pbuff; |
s16 c = 0, bytecount; |
|
if((!Partition.IsValid) || (file == NULL) || (string == NULL) || (length < 1)) return (0); |
bytecount = length; |
pbuff = string; // set write pointer to start of string |
while(bytecount > 1) // read the length-1 characters from the file to the string. |
{ |
c = fgetc_(file); // read a character from the opened file. |
switch(c) |
{ |
case 0x0A: // new line |
*pbuff = 0; // set string terminator |
return(string); // return normal |
|
case EOF: |
*pbuff = 0; // set string terminator |
return(0); |
|
default: |
*pbuff++ = (s8)c; // copy byte to string |
bytecount--; |
break; |
} |
} |
*pbuff = 0; // set string terminator |
return(string); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: fexist_(const u8*); */ |
/* */ |
/* Description: This function checks if a file already exist. */ |
/* */ |
/* Returnvalue: 1 if the file exist else 0. */ |
/****************************************************************************************************************************************/ |
u8 fexist_(s8 * const filename) |
{ |
u8 exist = 0; |
File_t *file = 0; |
file = LockFilePointer(); |
exist = FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file); |
UnlockFilePointer(file); |
return(exist); |
} |
|
/****************************************************************************************************************************************/ |
/* Function: feof_(File_t *File); */ |
/* */ |
/* Description: This function checks wether the end of the file has been reached. */ |
/* */ |
/* Returnvalue: 0 if the end of the file was not reached otherwise 1. */ |
/****************************************************************************************************************************************/ |
u8 feof_(File_t *file) |
{ |
if(((file->Position)+1) < (file->Size)) |
{ |
return(0); |
} |
else |
{ |
return(1); |
} |
} |
|
/****************************************************************************************************************************************************/ |
/* Function: s8* FAT16_GetVolumeLabel(void) */ |
/* */ |
/* Description: This function returns the volume label */ |
/* */ |
/* Returnvalue: This function returns the pointer to the volume label or NULL if not found. */ |
/****************************************************************************************************************************************************/ |
s8* FAT16_GetVolumeLabel(void) |
{ |
s8 *pVolumeLabel = NULL; |
u32 dir_sector, max_dir_sector, curr_sector; |
u16 dir_entry = 0; |
u8 i = 0; |
|
DirEntry_t * dir; |
File_t *file = NULL; |
|
// if Partition is not valud return NULL |
if(!Partition.IsValid) return(pVolumeLabel); |
// if Volume label was read before return it |
if(Partition.VolumeLabel[0]!= '\0') return (Partition.VolumeLabel); |
// try to catch a file pointer |
file = LockFilePointer(); |
if(file == NULL) return(pVolumeLabel); |
// search dir entries direct within the root directory area |
file->DirectorySector = 0; |
max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
|
// update current file data area position to start of first cluster |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
|
dir_sector = 0; // reset sector counter within a new cluster |
do // loop over all sectors of the root directory |
{ |
curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
file->SectorInCache = curr_sector; // upate the sector number of file cache. |
if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
{ |
Fat16_Deinit(); |
return(NULL); |
} |
dir = (DirEntry_t *)file->Cache; // set pointer to directory |
// search all directory entries within that sector |
for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
{ // check for existing dir entry |
switch((u8)dir[dir_entry].Name[0]) |
{ |
case SLOT_EMPTY: |
case SLOT_DELETED: |
// ignore empty or deleted dir entries |
break; |
default: |
// check attributes for volume label |
if ((dir[dir_entry].Attribute & ATTR_VOLUMELABEL) != ATTR_VOLUMELABEL) break; // attribute must match |
// (first 11 characters include 8 chars of basename and 3 chars extension.) |
for(i = 0; i<11;i++) Partition.VolumeLabel[i] = dir[dir_entry].Name[i]; |
Partition.VolumeLabel[11] = '\0'; // terminate string |
file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
file->SectorOfCurrCluster = 0; |
file->ByteOfCurrSector = 0; |
file->DirectorySector = curr_sector; // current sector |
file->DirectoryIndex = dir_entry; // current direntry in current sector |
file->Size = dir[dir_entry].Size; |
dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
pVolumeLabel = Partition.VolumeLabel; |
} // end of first byte of name check |
} |
dir_sector++; // search next sector |
// stop if we reached the end of the cluster or the end of the root dir |
}while((dir_sector < max_dir_sector) && (!pVolumeLabel)); |
|
UnlockFilePointer(file); |
return(pVolumeLabel); |
} |
|
|
|
#define ATTR_NONE 0x00 // normal file |
#define ATTR_READONLY 0x01 // file is readonly |
#define ATTR_HIDDEN 0x02 // file is hidden |
#define ATTR_SYSTEM 0x04 // file is a system file |
#define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
#define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
#define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
#define ATTR_ARCHIVE 0x20 // file is new or modified |
|
|
/********************************************************************************************************************************************/ |
/* Function: u8 FindItem(Find_t); */ |
/* */ |
/* Description: This function looks for the item specified by global structure FindElement in the actual directory */ |
/* */ |
/* */ |
/* Returnvalue: TRUE if an matching element was found */ |
/********************************************************************************************************************************************/ |
|
u8 FindItem(Find_t *findelement) |
{ |
u16 index = 0; |
u16 max_dir_sector = 0; |
u16 end_of_directory_not_reached = 1; // the directory has been read completely without a result. |
u8 i = 0; |
u8 readpointer = 0; |
u8 writepointer = 0; |
u8 retvalue = 0; |
DirEntry_t *DirectoryEntry; |
File_t file; |
|
file.FirstSectorOfCurrCluster = findelement->fp.FirstSectorOfCurrCluster; |
file.SectorOfCurrCluster = findelement->fp.SectorOfCurrCluster; |
index = findelement->fp.DirectoryIndex; |
|
// within the root directory area we can read sectors sequentially until the end of this area |
if((Partition.FirstRootDirSector <= file.FirstSectorOfCurrCluster) && (file.FirstSectorOfCurrCluster < Partition.FirstDataSector)) |
{ |
max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
} |
// within the data clusters we can read sectors sequentially only within the cluster |
else if((Partition.FirstDataSector <= file.FirstSectorOfCurrCluster) && (file.FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
{ |
max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
} |
|
do |
{ // search the next 16 rootentries in this sector of the roordirectory. |
if(SD_SUCCESS != SDC_GetSector(((u32) file.FirstSectorOfCurrCluster + (u32)file.SectorOfCurrCluster), file.Cache)); // Read the Rootdirectory. |
{ |
Fat16_Deinit(); |
return(0); |
} |
|
DirectoryEntry = (DirEntry_t *)file.Cache; |
|
while((!retvalue)&&(index<16)) |
{ |
i=0; |
if((u8) DirectoryEntry[index].Name[0] != 0xe5) // ignore deleted items. |
{ |
while((i<=10)&&((DirectoryEntry[index].Name[i] == findelement->searchstring[i]) || (findelement->searchstring[i]=='*') || findelement->searchstring[i]=='?')) |
{ |
i++; |
} |
} |
if((DirectoryEntry[index].Attribute <= 0x30) && (DirectoryEntry[index].Attribute & findelement->attribmask) && (i==11)) |
{ |
for(readpointer=0;readpointer<=10;readpointer++) |
{ |
if((DirectoryEntry[index].Name[readpointer] != ' ') && (readpointer!=8)) |
{ |
findelement->name[writepointer] = DirectoryEntry[index].Name[readpointer]; // copy the name of the item found to the find_structure. |
writepointer++; |
} |
else |
{ |
if(DirectoryEntry[index].Attribute == ATTR_ARCHIVE) |
{ |
if(readpointer < 8) readpointer=8; |
if(DirectoryEntry[index].Name[readpointer] != ' ') |
{ |
findelement->name[writepointer] = '.'; // then seperate the name and the extension by a '.' at index 8. |
writepointer++; |
findelement->name[writepointer] = DirectoryEntry[index].Name[readpointer]; // copy the name of the item found to the find_structure. |
writepointer++; |
} |
else break; |
} |
else break; |
} |
/* terminate the namestring with 0 for debugpurposes*/ |
findelement->name[12] = 0; |
} |
findelement->fp.FirstSectorOfFirstCluster = (u32) DirectoryEntry[index].StartCluster; |
findelement->fp.DirectoryIndex = index; |
findelement->fp.FirstSectorOfCurrCluster = file.FirstSectorOfCurrCluster; |
findelement->fp.DirectorySector = (file.FirstSectorOfCurrCluster + file.SectorOfCurrCluster); |
findelement->fp.SectorOfCurrCluster = file.SectorOfCurrCluster; |
findelement->fp.Size = DirectoryEntry[index].Size; |
findelement->fp.Attribute = DirectoryEntry[index].Attribute; |
retvalue = 1; |
} |
/* search the next sector */ |
index++; |
} |
/* this sector has been searched but we havn't found what we are looking for. Therefore we have to find the next sector */ |
if(!retvalue) // file not found in this sector so take next sector. |
{ |
/* in the next sector we start looking for the specified entry beginning at index 0 */ |
index = 0; |
/* there are still sectors to be read within the cluster or within the linear addresspace of the rootdirectory */ |
if(file.SectorOfCurrCluster < max_dir_sector-1) file.SectorOfCurrCluster++; else end_of_directory_not_reached = 0; |
/* 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 */ |
if(Partition.FirstDataSector <= file.FirstSectorOfCurrCluster) |
{ |
end_of_directory_not_reached = GetNextCluster(&file); |
} |
} |
} |
while((end_of_directory_not_reached) && (!retvalue) ); |
|
return(retvalue); |
} |
|
|
|
|
/********************************************************************************************************************************************/ |
/* Function: findnext_(Find_t *); */ |
/* */ |
/* Description: This function looks for the next item in the specified directory with a matching filename and fileattributes specified */ |
/* by function findfirst() */ |
/* */ |
/* Returnvalue: */ |
/********************************************************************************************************************************************/ |
u8 findnext_(Find_t * findelement) |
{ |
u8 itemfound = 0; |
u8 index = 0; |
|
findelement->fp.DirectoryIndex++; |
|
/* before we start searching an element we clear the complete namestring within the structure FindElement */ |
for(index=0;index<11;index++) findelement->name[index] = 0; |
|
if(FindItem(findelement)) |
{ |
itemfound = 1; |
} |
|
return(itemfound); |
} |
|
|
|
/********************************************************************************************************************************************/ |
/* Function: findfirst_(s8* filename, u8 attribmask, Find_t *); */ |
/* */ |
/* Description: This function looks for the first item in the specified directory with a matching filename and fileattributes */ |
/* The filename of the element found is transformed from 8.3 to a string */ |
/* */ |
/* */ |
/* Returnvalue: (1) if Element was found. (0) if no valid element was found */ |
/********************************************************************************************************************************************/ |
u8 findfirst_(const s8* name, u8 attribmask, Find_t *findelement) |
{ |
u8 itemfound = 0; |
u8 index = 0; |
|
/* initialize the FindElement structure */ |
findelement->fp.FirstSectorOfFirstCluster = 0; // First sector of the first cluster of the file. |
findelement->fp.FirstSectorOfCurrCluster = Partition.CurrentWorkingDirectory; // First sector of the cluster which is edited at the moment. |
findelement->fp.SectorOfCurrCluster = 0; // The sector within the current cluster. |
findelement->fp.ByteOfCurrSector = 0; // The byte location within the current sector. |
findelement->fp.Size = 0; // The size of the opend file in bytes. |
findelement->fp.Position = 0; // Pointer to a character within the file 0 < fileposition < filesize |
findelement->fp.DirectorySector = 0; // the sectorposition where the directoryentry has been made. |
findelement->fp.DirectoryIndex = 0; // The index to the directoryentry within the specified sector. |
findelement->attribfilter = 0; |
findelement->attribmask = attribmask; |
findelement->searchstring[0]=0; |
|
/* seperate the name of the element to be found from the filepath and bring it to the 8.3*/ |
SeperateDirName(name, findelement->searchstring); |
/* after the name of the element is in 8.3 we process the wildcards (*). After an * all following character are wildcards to */ |
for(index=0;index<8;index++) |
{ |
/* if we find an wildcard within the name of the searchstring all remaining character after the wildcard shall be wildcards also */ |
if(findelement->searchstring[index] == '*') |
{ |
/* */ |
while(++index <8) findelement->searchstring[index] = '*'; |
} |
} |
for(index=8;index<11;index++) |
{ |
/* if we find an wildcard within the name of the searchstring all remaining character after the wildcard shall be wildcards also */ |
if(findelement->searchstring[index] == '*') |
{ |
/* */ |
while(++index <11) findelement->searchstring[index] = '*'; |
} |
} |
|
/* the value of ...DirectoryIndex will be incremented in findnext_() thererfore it has to be decremented in findfirst_() */ |
findelement->fp.DirectoryIndex--; |
/* now lets search for the item within the direcory */ |
itemfound = findnext_(findelement); |
|
return(itemfound); |
} |
|
|
/********************************************************************************************************************************************/ |
/* Function: u8 GetDirCount(s8* filepath); */ |
/* */ |
/* Description: This function counts the number of subdirectories the dirpath contains */ |
/* */ |
/* */ |
/* Returnvalue: then number of subdirectories within the specified path */ |
/********************************************************************************************************************************************/ |
u8 GetDirCount(u8 *dirpath) |
{ |
u8 i=0; |
u8 cnt=0; |
|
while(dirpath[i] != 0 ) |
{ |
if(dirpath[i]=='/') |
{ |
if(dirpath[i+1]!=0) cnt++; // ignore last'/' |
} |
i++; |
} |
i=0; |
return(cnt); |
} |
|
|
/********************************************************************************************************************************************/ |
/* Funtion: char *GetSubDirectory (char *dirpath, char *directory) */ |
/* */ |
/* Description: this function returns a pointer to the beginning of the next subdirectory or NULL */ |
/* */ |
/* */ |
/* returnvalue: number of subdirectories in the filepath */ |
/********************************************************************************************************************************************/ |
u8 * GetSubDirectory(u8 *dirpath, u8 *directory) |
{ |
u8 *cptr = dirpath; |
u8 *dptr = directory; |
u8 *retvalue = NULL; |
|
/* if the first character of the path is an '/' we go to the next character */ |
if(*cptr == '/') cptr++; |
/* search end of path or subdirectory*/ |
while((*cptr != 0) && (*cptr != '/')) |
{ |
*dptr = *cptr; |
dptr++; |
cptr++; |
} |
if(*cptr!=0) retvalue = ++cptr; |
*dptr = 0; |
|
return(retvalue); |
} |
|
/********************************************************************************************************************************************/ |
/* Function: s8 *GetPath(void); */ |
/* */ |
/* Description: This function function returns a pointer to the absolute path of the active partition */ |
/* */ |
/* */ |
/* Returnvalue: */ |
/********************************************************************************************************************************************/ |
|
s8 *GetPath(void) |
{ |
return(Partition.PathToCwd); |
} |
|
/********************************************************************************************************************************************/ |
/* Function: void SetPathToRoot(void); */ |
/* */ |
/* Description: This function sets the path to the rootdirectory */ |
/* */ |
/* */ |
/* Returnvalue: */ |
/********************************************************************************************************************************************/ |
|
void SetPathToRoot(void) |
{ |
/* lets point to the rootdirectory */ |
strcpy(Partition.PathToCwd, "/"); |
} |
|
/********************************************************************************************************************************************/ |
/* Function: void AppendDirToPath(s8* directory); */ |
/* */ |
/* Description: This function function appends the name of an directory to the Path to the CWD */ |
/* */ |
/* */ |
/* Returnvalue: */ |
/********************************************************************************************************************************************/ |
|
void AppendDirToPath(s8* directory) |
{ |
/* append the name of the directory to the path */ |
strcat(Partition.PathToCwd, directory); |
/* append a '/' after the directoryname */ |
strcat(Partition.PathToCwd, "/"); |
} |
|
/********************************************************************************************************************************************/ |
/* Function: RemoveLastDirFromPath(void); */ |
/* */ |
/* Description: This function removes the last directory from the path to the cwd */ |
/* */ |
/* */ |
/* Returnvalue: */ |
/********************************************************************************************************************************************/ |
|
void RemoveLastDirFromPath(void) |
{ |
/* a pointer to the beginning of the absolute path to the cwd */ |
s8 * cptr = Partition.PathToCwd; |
/* lets find the end of the path to the cwd */ |
while(*cptr != 0 ) cptr++; |
/* if the path is terminated with an '/' */ |
if((*(cptr-1)) == '/') *(cptr-1)=0; |
/* now lets find the beginning of the last directorientry */ |
while((*cptr != '/' ) && cptr > Partition.PathToCwd) cptr--; |
/* is there one subdirectory left within the path? */ |
if(cptr > Partition.PathToCwd) |
{ |
/* we delete the direntry by terminating the path with 0 */ |
*cptr = 0; |
} |
/* there is no subdirectory left within the path. Therefore we create the root instead. */ |
else |
{ |
*cptr = '/'; |
*(cptr+1) = 0; |
} |
} |
|
/********************************************************************************************************************************************/ |
/* Function: chdir_(s8* filepath); */ |
/* */ |
/* Description: This function changed the current working directory to the directory specified by the filepath */ |
/* by function findfirst() */ |
/* */ |
/* Returnvalue: */ |
/********************************************************************************************************************************************/ |
/* |
#define ATTR_NONE 0x00 // normal file |
#define ATTR_READONLY 0x01 // file is readonly |
#define ATTR_HIDDEN 0x02 // file is hidden |
#define ATTR_SYSTEM 0x04 // file is a system file |
#define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
#define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
#define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
#define ATTR_ARCHIVE 0x20 // file is new or modified |
*/ |
|
u8 chdir_(s8 *path) |
{ |
u8 retvalue = 0; // the value returned by this function |
u32 ultemp = 0; // temp. variable |
u8 *directory = path; // pointer to a directoryname within the path |
u8 dircount = 0; // the number of subdirectoryentries within the path |
u8 cache[64]; // a buffer containing the name of the subdirectory we are actually looking for |
Find_t fe; // The findelement needed for function findfirst to find the subdirectoryentry |
s8 tp[256]; // temporarily we remember the actual path until the operation has finished successfully |
u32 cwdt = 0; |
s8 *cptr; |
|
/* bring the path into the correct syntax */ |
cptr = path; |
/* search the whole string */ |
while(*cptr != 0 ) |
{ |
if(*cptr == '\\') *cptr = '/'; |
cptr++; |
} |
/* lets remember the actual path */ |
strcpy(tp, Partition.PathToCwd); |
cwdt = Partition.CurrentWorkingDirectory; |
/* how many subdirectories are there within the path? */ |
dircount = GetDirCount(path); |
/* if the path is absolute we begin at the rootdirectory */ |
if(path[0] == '/') |
{ |
strcpy(Partition.PathToCwd, "/"); |
Partition.CurrentWorkingDirectory = Partition.FirstRootDirSector; |
/* if there is no other pathinformation we only switch to the rootdirectory. So theres nothing left todo.*/ |
if(!dircount) return(1); |
} |
/* now we parse through all the subdirectories within the path */ |
do |
{ |
/* until all the subdirectories within the path have been processed */ |
if(dircount) dircount--; |
/* this is the name of the next subdirectory we are looking for */ |
directory = GetSubDirectory(directory, cache); |
/* search for the next subdirectory within the path */ |
if(findfirst_(cache, ATTR_SUBDIRECTORY, &fe)) |
{ |
/* we try to change into the directory "..". Now we have to delete the last direntry from the path */ |
if(strcmp(cache,"..") == 0) RemoveLastDirFromPath(); |
/* we try to change into the actual directory so there's nothing todo */ |
else if(cache[0] == '.') return(1); |
/* otherwise we append the name of the directory we are changing in to the path */ |
else AppendDirToPath(cache); |
/* The startcluster within an directoryentry specifies the position within the fat where the file or directory starts */ |
ultemp = (u32) fe.fp.FirstSectorOfFirstCluster; |
/* the first 2 entries are reserved for '.' and '..' */ |
ultemp -= 2; |
/* 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*/ |
ultemp *= Partition.SectorsPerCluster; |
/* at least we make the sectoraddress absolute by adding the relative address to the beginning of the datasection of the active partition */ |
ultemp += Partition.FirstDataSector; |
/* the cwd now points to the specified directory */ |
Partition.CurrentWorkingDirectory = ultemp; |
/* we found the folder specified by the foldername */ |
retvalue = 1; |
} |
} |
/* do this until all subdirectories have been found or a subdirectory is missing */ |
while(dircount && retvalue ); |
|
/* if we could not change to the specified directory we restore the actual path */ |
if(!retvalue) |
{ |
Partition.CurrentWorkingDirectory = cwdt; |
strcpy(Partition.PathToCwd, tp); |
} |
return(retvalue); |
} |