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1 | ingob | 1 | /*#######################################################################################*/ |
2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
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3 | /*#######################################################################################*/ |
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4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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5 | // + Copyright (c) 2008 Ingo Busker, Holger Buss |
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171 | ingob | 6 | // + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY |
1 | ingob | 7 | // + FOR NON COMMERCIAL USE ONLY |
8 | // + www.MikroKopter.com |
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9 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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10 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
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11 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
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12 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
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13 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
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14 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
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15 | // + Verkauf von Luftbildaufnahmen, usw. |
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16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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17 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
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18 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
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19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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20 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
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21 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
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22 | // + eindeutig als Ursprung verlinkt werden |
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23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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24 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
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25 | // + Benutzung auf eigene Gefahr |
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26 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
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27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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171 | ingob | 28 | // + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
1 | ingob | 29 | // + mit unserer Zustimmung zulässig |
30 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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31 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
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32 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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33 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
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34 | // + this list of conditions and the following disclaimer. |
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35 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
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36 | // + from this software without specific prior written permission. |
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37 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted |
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38 | // + for non-commercial use (directly or indirectly) |
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39 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
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40 | // + with our written permission |
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41 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
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42 | // + clearly linked as origin |
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171 | ingob | 43 | // + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
1 | ingob | 44 | // |
45 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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46 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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47 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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48 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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49 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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50 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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51 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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52 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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53 | // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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54 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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55 | // + POSSIBILITY OF SUCH DAMAGE. |
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56 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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57 | |||
58 | #include "main.h" |
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59 | |||
60 | //________________________________________________________________________________________________________________________________________ |
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61 | // Module name: fat16.c |
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62 | // Compiler used: avr-gcc 3.4.5 |
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63 | // Last Modifikation: 24.07.2007 |
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64 | // Version: 1.24 |
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65 | // Authors: Stephan Busker |
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66 | // Description: Source files for FAT16 implementation with read and write-access using AVR-Mikrocontrollers |
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67 | // Copyright (C) 2007 Stephan Busker |
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68 | //........................................................................................................................................ |
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69 | // Functions: extern u8 InitFat16(void); |
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70 | // u8 fopen_(u8 *fname,s8 mode, File *file); |
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71 | // void fclose_(File *file); |
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72 | // u32 fread_(void *buffer, u32 size, u32 count, File *file); |
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73 | // u32 fwrite_(void *buffer, u32 size, u32 count, File *file); |
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74 | // s16 fseek_(File *file, s32 offset, s16 origin); |
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75 | // s8 fgets8_(File *file); |
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76 | // u8 fputchar_(File *file,s8 c); |
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77 | // u8 fputs_(File *file,s8 *string); |
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78 | // s8 * fgets(s8 *, s16, File); |
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79 | // u8 fexist_(u8*, File *file); |
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80 | //........................................................................................................................................ |
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81 | // ext. functions: extern u8 SDC_GetSector (u32,u8 *); |
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82 | // extern u8 SDC_PutSector (u32,u8 *); |
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83 | //........................................................................................................................................ |
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84 | // |
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85 | // URL: www.Mikro-Control.de |
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86 | // mailto: stephan.busker@mikro-control.de |
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87 | //________________________________________________________________________________________________________________________________________ |
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88 | |||
89 | |||
90 | |||
91 | |||
92 | //________________________________________________________________________________________________________________________________________ |
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93 | // |
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94 | // Global variables needed for read- or write-acces to the FAT16- filesystem. |
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95 | // |
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96 | //________________________________________________________________________________________________________________________________________ |
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97 | |||
98 | u8 SectorsPerCluster = 0; // how many sectors does a cluster contain? |
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99 | u8 FatCopies = 0; // Numbers of copies of the FAT |
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100 | u16 PossibleRootEntries = 0; // Possible number of entries in the root directory. |
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101 | u16 SectorsPerFat = 0; // how many sectors does a fat16 contain? |
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102 | u32 ReservedSectors = 0; // Sectors reserved by the filesystem. |
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103 | u32 FirstPartitionSector = 0; // Distance in sectors between the first partition and the master bootrecord. |
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104 | u32 FileAllocationTable = 0; // pointer to the first FAT |
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105 | u32 RootDirectory = 0; // Pointer to the rootdirectory of the first partition. |
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106 | u32 FirstDataCluster = 0; // Pointer to the first cluster containing data (cluster0). |
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107 | //u8 FileBuffer[512]; // Buffer for read and write operation from or to the mmc. |
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108 | |||
109 | struct DirEntry *DirectoryEntry; // Pointer to an entry of the directory. |
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110 | struct FatEntry *Fat; // Pointer to an entry of the fat (next clusterposition). |
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111 | |||
112 | File FilePointer[__MAX_FILES_USED]; // Allocate Memmoryspace for each filepointer used. |
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113 | |||
114 | |||
115 | |||
116 | |||
117 | //________________________________________________________________________________________________________________________________________ |
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118 | // Funtion: InitFat16(void); |
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119 | // |
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120 | // Description: This function reads the Masterbootrecord and finds the position of the Volumebootrecord, the FAT and the Rootdirectory |
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121 | // and stores the information in global variables. |
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122 | // |
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123 | // Returnvalue: The function returns "0" if the filesystem could not be initialized because no partition was found on the disc. |
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124 | //________________________________________________________________________________________________________________________________________ |
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125 | |||
126 | u8 InitFat16(void) |
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127 | { |
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128 | u8 retvalue = 0; |
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129 | u8 cnt = 0; |
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130 | struct VBR_Entry *VBR; // Pointer to the VolumeBootRecord. |
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131 | struct MBR_Entry *MBR; // Pointer to the masterbootrecord. |
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132 | File *file; |
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133 | |||
134 | for(cnt=0;cnt<__MAX_FILES_USED;cnt++) |
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135 | { |
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136 | FilePointer[cnt].state = _UNUSED; // declare the filepointers as unused. |
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137 | } |
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138 | |||
139 | file = &FilePointer[0]; |
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140 | |||
141 | while((SDC_Init() != 0) && (cnt++<200)); // initialise the sdcard. |
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142 | if(cnt <200) //sdcard initialised succesfully |
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143 | { |
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144 | SDC_GetSector((u32)MBR_SECTOR,file->buffer); // Read the MasterBootRecord from mmc. |
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145 | MBR = (struct MBR_Entry *) file->buffer; |
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146 | FirstPartitionSector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
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147 | SDC_GetSector(FirstPartitionSector,file->buffer); // Read the volume bootrecord from mmc. |
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148 | |||
149 | |||
150 | VBR = (struct VBR_Entry *) file->buffer; // Enter the VBR using the structure VBR_Entry. |
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151 | SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
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152 | FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
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153 | PossibleRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
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154 | SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT. |
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155 | ReservedSectors = VBR->ReservedSectors; // calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. |
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156 | |||
157 | FileAllocationTable = (u32)(FirstPartitionSector + (u32)ReservedSectors); // Calculate the position of the FileAllocationTable. |
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158 | RootDirectory = (u32)((u32)FileAllocationTable + (u32)((u32)SectorsPerFat*(u32)FatCopies)); // Calculate the position of the Rootdirectory. |
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159 | FirstDataCluster = (u32)((u32)RootDirectory + ((u32)(PossibleRootEntries>>4))); // Calculate the position of the first datacluster. |
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160 | |||
161 | if((file->buffer[0x36]=='F') &&(file->buffer[0x37]=='A')&&(file->buffer[0x38]=='T')&&(file->buffer[0x39]=='1')&&(file->buffer[0x3A]=='6')) |
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162 | { |
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163 | retvalue = 1; |
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164 | } |
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165 | } |
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166 | return(retvalue); |
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167 | } |
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168 | |||
169 | //________________________________________________________________________________________________________________________________________ |
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170 | // Funtion: File * fopen_(u8*, u8 *, File *file); |
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171 | // |
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172 | // Description: This function looks for the specified file in the rootdirectory of the drive. If the file is found the number of the |
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173 | // corrosponding datacluster is returned to main. Only modes 'r' (reading) and 'a' append are implemented yet. |
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174 | // |
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175 | // Return: 0 = faild to open speicified file |
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176 | // 1 = file opened |
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177 | //________________________________________________________________________________________________________________________________________ |
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178 | |||
179 | File * fopen_(u8 *fname, s8 mode) |
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180 | { |
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181 | u32 cluster_temp = 0; |
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182 | u8 name[11] = " "; |
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183 | u16 temp = 0; |
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184 | File *file; |
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185 | |||
186 | file=0; |
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187 | for(temp = 0;temp<__MAX_FILES_USED;temp++) |
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188 | { |
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189 | if(FilePointer[temp].state == _UNUSED) // free filepointer found? |
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190 | { |
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191 | file = &FilePointer[temp]; |
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192 | FilePointer[temp].state = _USED; // mark as used. |
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193 | break; |
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194 | } |
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195 | } |
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196 | |||
197 | if(file == 0) return(file); // no valid pointer |
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198 | |||
199 | file->start_cluster = 0; // Sectorpointer to the first sector of the first datacluster of the file. |
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200 | file->cluster_pointer = 0; // Pointer to the cluster which is edited at the moment. |
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201 | file->sector_index = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
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202 | file->byte_index = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
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203 | file->mode = mode; // mode of fileoperation (read,write) |
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204 | file->filesize = 0; // the size of the opend file in bytes. |
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205 | file->fileposition = 0; // pointer to a character within the file 0 < fileposition < filesize |
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206 | file->sector_in_buffer = 0; // the last sector read, wich is still in the sectorbuffer. |
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207 | file->directory_sector = 0; // the sectorposition where the directoryentry has been made. |
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208 | file->directory_index = 0; // the index to the directoryentry within the specified sector. |
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209 | file->attribute = 0; // the attribute of the file opened. |
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210 | |||
211 | if(ScanSubDirectories(&fname[0], file)) // Is the specified filepath available? |
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212 | { |
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213 | SeperateFileName(&fname[0], &name[0]); // seperate the filename and attribute from the filepath and bring them in the correct format. |
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214 | file->attribute = _FILE; |
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215 | if(SeekDirectoryEntry(&name[0], file)) // if file was found |
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216 | { |
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217 | if(mode == 'a') // open existing file for writing (append data at the end of the file) |
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218 | { |
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219 | fseek_(file, 0, SEEK_END); // fseek points to the end of the file |
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220 | } |
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221 | return(file); |
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222 | } |
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223 | else |
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224 | { |
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225 | if((mode == 'a') || (mode == 'w')) // specified file doesn't exist so create new file for writing data. |
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226 | { |
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227 | cluster_temp = (u32)FindNextFreeCluster(file); // the next free cluster on the disk. |
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228 | if(cluster_temp) // if a free cluster is available: |
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229 | { |
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230 | temp = (u16)cluster_temp; // remember the index of the free datacluster found for the directory entry. |
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231 | cluster_temp -=2; // Clusterposition is ((position in FAT)-2). first two entries in FAT are reserved. |
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232 | cluster_temp *= SectorsPerCluster; // Calculate relative sectorindex of first datacluster. |
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233 | file->start_cluster = (FirstDataCluster + cluster_temp); // Calculate absolute sectorposition of first datacluster. |
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234 | file->cluster_pointer = file->start_cluster; // start reading the file with the first sector of the first datacluster. |
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235 | if(CreateDirectoryEntry(&name[0],temp,file,_FILE)) // Could an entry for the new file in the rootdirectory be created? |
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236 | { |
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237 | return(file); |
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238 | } |
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239 | } |
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240 | } |
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241 | } |
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242 | } |
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243 | return(0); |
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244 | } |
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245 | |||
246 | //________________________________________________________________________________________________________________________________________ |
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247 | // Funtion: fflush_(File *file); |
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248 | // |
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249 | // Description: This function writes the data already in the buffer but not yet written to the file. |
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250 | // |
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251 | //________________________________________________________________________________________________________________________________________ |
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252 | |||
253 | s16 fflush_(File *file) |
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254 | { |
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255 | u16 time=0; |
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256 | u16 date=0; |
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257 | |||
258 | #ifdef __USE_TIME_DATE_ATTRIBUTE // has the date and time attribute of the file to be set? |
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259 | |||
260 | time = (((rtctime.hour)<<11) | ((rtctime.minute)<<5) | rtctime.second); |
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261 | date = ((((rtctime.year)-1980) <<9) | ((rtctime.month) <<5) | rtctime.day); |
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262 | |||
263 | #endif |
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264 | |||
265 | |||
266 | if(file && file->mode =='a') |
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267 | { |
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268 | if(file->byte_index > 0) // has data been added to the file? |
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269 | { |
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270 | SDC_PutSector((u32)(file->cluster_pointer + file->sector_index),file->buffer); // save the data still in the buffer |
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271 | } |
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272 | SDC_GetSector((u32)file->directory_sector,file->buffer); // read the directoryentry for this file. |
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273 | DirectoryEntry = (struct DirEntry *)file->buffer; |
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274 | DirectoryEntry[file->directory_index].size = (u32) file->filesize; |
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275 | DirectoryEntry[file->directory_index].time = (u16) time; |
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276 | DirectoryEntry[file->directory_index].date = (u16) date; |
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277 | SDC_PutSector((u32)file->directory_sector,file->buffer); |
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278 | } |
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279 | return(0); |
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280 | } |
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281 | |||
282 | //________________________________________________________________________________________________________________________________________ |
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283 | // Funtion: fclose_(File *file); |
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284 | // |
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285 | // Description: This function closes the open file by writing the remaining data from the buffer to the device and entering the filesize |
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286 | // in the directory entry. |
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287 | //________________________________________________________________________________________________________________________________________ |
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288 | |||
289 | void fclose_(File *file) |
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290 | { |
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291 | u8 cnt = 0; |
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292 | |||
293 | for(cnt=0;cnt<__MAX_FILES_USED;cnt++) |
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294 | { |
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295 | if(&FilePointer[cnt] == file) // filepointer to be freed found? |
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296 | { |
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297 | FilePointer[cnt].state = _UNUSED; |
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298 | } |
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299 | |||
300 | fflush_(file); // save buffercontent to the sdcard |
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301 | |||
302 | file->start_cluster = 0; // Sectorpointer to the first sector of the first datacluster of the file. |
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303 | file->cluster_pointer = 0; // Pointer to the cluster which is edited at the moment. |
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304 | file->sector_index = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
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305 | file->byte_index = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
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306 | file->mode = 0; // mode of fileoperation (read,write) |
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307 | file->filesize = 0; // the size of the opend file in bytes. |
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308 | file->fileposition = 0; // pointer to a character within the file 0 < fileposition < filesize |
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309 | file->sector_in_buffer = 0; // the last sector read, wich is still in the sectorbuffer. |
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310 | file->directory_sector = 0; // the sectorposition where the directoryentry has been made. |
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311 | file->directory_index = 0; // the index to the directoryentry within the specified sector. |
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312 | file->attribute = 0; // the attribute of the file opened. |
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313 | } |
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314 | } |
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315 | |||
316 | //________________________________________________________________________________________________________________________________________ |
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317 | // Funtion: s32 fread_(void *buffer, s32 size, s32 count, File *file); |
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318 | // |
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319 | // Description: This function reads count objects of the specified size from the actual position of the file to the specified buffer. |
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320 | // |
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321 | // Returnvalue: The function returns the number of objects (not bytes) read from the file. |
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322 | // |
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323 | //________________________________________________________________________________________________________________________________________ |
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324 | |||
325 | u32 fread_(void *buffer, u32 size, u32 count, File *file) |
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326 | { |
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327 | u32 object_cnt = 0; // count the number of objects read from the file. |
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328 | u32 object_size = 0; // count the number of bytes read from the actual object. |
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329 | u8 *buff_pnt = 0; // a pointer to the actual bufferposition. |
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330 | u8 success = 1; // no error occured during read operation to the file. |
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331 | |||
332 | buff_pnt = (u8 *) buffer; // cast the void pointer to an u8 * |
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333 | |||
334 | while((object_cnt < count) && success) |
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335 | { |
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336 | object_size = size; |
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337 | while((size > 0) && success) |
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338 | { |
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339 | *buff_pnt = (u8) fgetchar_(file); // read a byte from the buffer to the opened file. |
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340 | buff_pnt++; |
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341 | size--; |
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342 | } |
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343 | if(success) object_cnt++; |
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344 | } |
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345 | |||
346 | return(object_cnt); // return the number of objects succesfully read from the file |
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347 | } |
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348 | |||
349 | //________________________________________________________________________________________________________________________________________ |
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350 | // Funtion: s32 fwrite_(void *buffer, s32 size, s32 count, File *file); |
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351 | // |
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352 | // Description: This function writes count objects of the specified size from the buffer to the actual positon within the file. |
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353 | // |
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354 | // Returnvalue: The function returns the number of objects (not bytes) written to the file. |
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355 | // |
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356 | //________________________________________________________________________________________________________________________________________ |
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357 | |||
358 | u32 fwrite_(void *buffer, u32 size, u32 count, File *file) |
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359 | { |
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360 | u32 object_cnt = 0; // count the number of objects written to the file. |
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361 | u32 object_size = 0; // count the number of bytes written from the actual object. |
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362 | u8 *buff_pnt = 0; // a pointer to the actual bufferposition. |
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363 | u8 success = 1; // no error occured during write operation to the file. |
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364 | |||
365 | buff_pnt = (u8 *) buffer; // cast the void pointer to an u8 * |
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366 | |||
367 | while((object_cnt < count) && success) |
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368 | { |
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369 | object_size = size; |
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370 | while((size > 0) && success) |
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371 | { |
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372 | success = fputchar_(file, *buff_pnt); // write a byte from the buffer to the opened file. |
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373 | buff_pnt++; |
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374 | size--; |
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375 | } |
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376 | if(success) object_cnt++; |
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377 | } |
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378 | |||
379 | return(object_cnt); // return the number of objects succesfully written to the file |
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380 | } // (!!!!! objects and not bytes !!!!) |
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381 | |||
382 | //________________________________________________________________________________________________________________________________________ |
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383 | // Funtion: s16 fseek_(File *, s32, s16) |
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384 | // |
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385 | // Description: This function sets the pointer of the stream relative to the position |
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386 | // specified by origin (SEEK_SET, SEEK_CUR, SEEK_END). |
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387 | // |
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388 | //________________________________________________________________________________________________________________________________________ |
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389 | |||
390 | s16 fseek_(File *file, s32 offset, s16 origin) |
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391 | { |
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392 | s32 fposition = 0; |
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393 | s16 retvalue = 1; |
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394 | u32 temp = 0; |
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395 | |||
396 | //...................................................... |
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397 | if(origin == SEEK_SET) // Fileposition relative to the beginning of the file. |
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398 | { |
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399 | fposition = 0; |
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400 | } |
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401 | //...................................................... |
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402 | else if(origin == SEEK_END) // Fileposition relative to the end of the file. |
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403 | { |
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404 | fposition = (s32) file->filesize; |
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405 | } |
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406 | //...................................................... |
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407 | else if(origin == SEEK_CUR) // Fileposition relative to the current position of the file. |
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408 | { |
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409 | fposition = file->fileposition; |
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410 | } |
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411 | |||
412 | fposition += offset; |
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413 | |||
414 | if((fposition >= 0) && (fposition <= (s32)file->filesize)) // is the pointer still within the file? |
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415 | { |
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416 | retvalue = 0; |
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417 | file->sector_index = 0; |
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418 | file->byte_index = 0; |
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419 | file->fileposition = 0; |
||
420 | file->cluster_pointer = file->start_cluster; |
||
421 | |||
422 | while(file->fileposition < fposition) |
||
423 | { |
||
424 | file->fileposition++; |
||
425 | if(file->byte_index < 511) |
||
426 | { |
||
427 | file->byte_index++; |
||
428 | } |
||
429 | else |
||
430 | { |
||
431 | file->byte_index=0; // reading at the beginning of new sector. |
||
432 | file->sector_index++; // continue reading in next sector |
||
433 | if(file->sector_index >= SectorsPerCluster) // When end of cluster is reached, the next datacluster has to be searched in the FAT. |
||
434 | { |
||
435 | if(file->fileposition < fposition) |
||
436 | { |
||
437 | file->sector_index = 0; // start reading new cluster at first sector of the cluster. |
||
438 | GetNextCluster(file); // Sets the clusterpointer of the file to the next datacluster. |
||
439 | } |
||
440 | } |
||
441 | } |
||
442 | } |
||
443 | if(file->byte_index) |
||
444 | { |
||
445 | temp = (u32)((u32)file->cluster_pointer + (u32)file->sector_index); |
||
446 | SDC_GetSector((u32)temp,file->buffer); // FileBuffer will be written at once at the end of the cluster and has to be updated. |
||
447 | } |
||
448 | } |
||
449 | return(retvalue); |
||
450 | } |
||
451 | |||
452 | //________________________________________________________________________________________________________________________________________ |
||
453 | // Funtion: fgetchar_(File *file); |
||
454 | // |
||
455 | // Description: This function reads and returns one character from the specified file. Is the end of the actual sector reached the |
||
456 | // next sector of the cluster is read. Is the last sector of the cluster read the next cluster will be searched in FAT. |
||
457 | // Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. |
||
458 | //________________________________________________________________________________________________________________________________________ |
||
459 | |||
460 | s16 fgetchar_(File *file) |
||
461 | { |
||
462 | s16 c = EOF; |
||
463 | u32 temp1; |
||
464 | |||
465 | if(file->filesize > 0) // wen the end of the file is not reached, get the next character. |
||
466 | { |
||
467 | temp1 = (u32)file->cluster_pointer; // calculate the adress of the next character to be read. |
||
468 | temp1 += (u32)file->sector_index; |
||
469 | |||
470 | if(file->sector_in_buffer != temp1) // Has the content of the buffer been modified and has to be updated? |
||
471 | { |
||
472 | SDC_GetSector((u32)temp1,file->buffer); // Read the calculated cluster. |
||
473 | file->sector_in_buffer = (u32)temp1; |
||
474 | } |
||
475 | c = (s16) file->buffer[file->byte_index]; |
||
476 | file->filesize--; // decrement the number of characters available. |
||
477 | |||
478 | if(file->byte_index < 511) // continue reading from this sector until the end of the sector is reached. |
||
479 | { |
||
480 | file->byte_index++; |
||
481 | } |
||
482 | else // has the end of an sector been reached-> |
||
483 | { |
||
484 | file->byte_index=0; // continue reading at the beginning - |
||
485 | file->sector_index++; // of new sector. |
||
486 | if(file->sector_index >= SectorsPerCluster) // When the end of an cluster is reached, the next datacluster has to be searched in the FAT. |
||
487 | { |
||
488 | file->sector_index = 0; // start reading new cluster at first sector of the cluster. |
||
489 | GetNextCluster(file); // Sets the clusterpointer of the file to the next datacluster. |
||
490 | } |
||
491 | } |
||
492 | } |
||
493 | return(c); |
||
494 | } |
||
495 | |||
496 | //________________________________________________________________________________________________________________________________________ |
||
497 | // Funtion: fputchar_(File *file); |
||
498 | // |
||
499 | // Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. |
||
500 | // |
||
501 | // Returnvalue: The function returns a value of 0 if the data could not be written. |
||
502 | //________________________________________________________________________________________________________________________________________ |
||
503 | |||
504 | u8 fputchar_(File *file,s8 c) |
||
505 | { |
||
506 | u32 ul_temp = 0; |
||
507 | u8 retvalue = 1; |
||
508 | |||
509 | if(file->sector_index >= SectorsPerCluster) // if end of the cluster is reached, find next free cluster |
||
510 | { |
||
511 | file->sector_index = 0; |
||
512 | if(!AppendCluster(file)) retvalue = 0; // append a new and free cluster at the end of the file. |
||
513 | } |
||
514 | |||
515 | file->buffer[file->byte_index] = c; // write databyte into the buffer. The byte will be written to the device at once |
||
516 | if(file->filesize == file->fileposition) file->filesize++; // a character has been written to the file so the size is inkremented but only when the character has been added at the end of the file. |
||
517 | file->fileposition++; // the actual positon within the file. |
||
518 | // if the buffer contains the complete sectordata. |
||
519 | if(file->byte_index < 511) // if the end of this sector is not reached yet |
||
520 | { |
||
521 | file->byte_index++; // the next byte will be written to the next byteposition in this sector. |
||
522 | } |
||
523 | else // otherwise the data in the sectorbuffer will be written to the device and the next sector will be selected. |
||
524 | { |
||
525 | ul_temp = (u32)file->cluster_pointer; |
||
526 | ul_temp += (u32)file->sector_index; |
||
527 | |||
528 | SDC_PutSector((u32)ul_temp,file->buffer); |
||
529 | file->byte_index=0; // and the next byte will be written at the beginning of this new sector. |
||
530 | file->sector_index++; |
||
531 | if(file->sector_index >= SectorsPerCluster) // if end of the cluster is reached, find next free cluster |
||
532 | { |
||
533 | file->sector_index = 0; |
||
534 | if(!AppendCluster(file)) retvalue = 0; // append a new and free cluster at the end of the file. |
||
535 | } |
||
536 | } |
||
537 | return(retvalue); |
||
538 | } |
||
539 | |||
540 | //________________________________________________________________________________________________________________________________________ |
||
541 | // Funtion: fputs_(File *file); |
||
542 | // |
||
543 | // Description: This function writes a string to the specified file. |
||
544 | // |
||
545 | //________________________________________________________________________________________________________________________________________ |
||
546 | |||
547 | u8 fputs_(File *file,s8 * string) |
||
548 | { |
||
549 | u8 i=0; |
||
550 | |||
551 | while(string[i] != 0) |
||
552 | { |
||
553 | fputchar_(file,string[i]); |
||
554 | i++; |
||
555 | } |
||
556 | return(0); |
||
557 | } |
||
558 | |||
559 | //________________________________________________________________________________________________________________________________________ |
||
560 | // Funtion: fgets_(File *file); |
||
561 | // |
||
562 | // Description: This function reads a string from the file to the specifies string. |
||
563 | // |
||
564 | // Returnvalue: A pointer to the string written from the file. |
||
565 | //________________________________________________________________________________________________________________________________________ |
||
566 | |||
567 | s8 * fgets_(s8 *string, s16 count, File *file) |
||
568 | { |
||
569 | s16 buff_pnt = 0; |
||
570 | s16 buff_tmp = 0; |
||
571 | u8 state = 0; // Variable used for a statemachine to recognize the end of a line. |
||
572 | |||
573 | while(count > 1) // read the count-1 characters from the file to the string. |
||
574 | { |
||
575 | buff_tmp = fgetchar_(file); // read a character from the opened file. |
||
576 | switch(state) |
||
577 | { |
||
578 | case 0: |
||
579 | if(buff_tmp == 0x0A)// state++; |
||
580 | { |
||
581 | count = 1; |
||
582 | } |
||
583 | state = 0; |
||
584 | break; |
||
585 | |||
586 | case 1: |
||
587 | if(buff_tmp == 0x0A) |
||
588 | { |
||
589 | count = 1; |
||
590 | } |
||
591 | state = 0; |
||
592 | break; |
||
593 | } |
||
594 | if(buff_tmp == EOF) {buff_tmp = 0; count = 1;} // is the end of the file reached, terminate the string with zero. |
||
595 | string[buff_pnt] = (s8) buff_tmp; |
||
596 | count--; |
||
597 | buff_pnt++; |
||
598 | } |
||
599 | string[buff_pnt] = 0; |
||
600 | return(string); |
||
601 | } |
||
602 | |||
603 | //________________________________________________________________________________________________________________________________________ |
||
604 | // Funtion: u8 fexist_(u8*, File *file); |
||
605 | // |
||
606 | // Description: This function searches the specified file and returns 0 if the file was not found. |
||
607 | // |
||
608 | // |
||
609 | // Return: 0 = file does not exist |
||
610 | // 1 = file exists |
||
611 | //________________________________________________________________________________________________________________________________________ |
||
612 | |||
613 | u8 fexist_(u8 *fname) |
||
614 | { |
||
615 | File *file; |
||
616 | |||
617 | if((file = fopen_(fname,'r')) != 0) |
||
618 | { |
||
619 | fclose_(file); |
||
620 | return(1); |
||
621 | } |
||
622 | else |
||
623 | { |
||
624 | return(0); |
||
625 | } |
||
626 | } |
||
627 | |||
628 | //________________________________________________________________________________________________________________________________________ |
||
629 | // Funtion: GetNextCluster(File *file); |
||
630 | // |
||
631 | // Description: This function finds the next datacluster of the file specified with File *file. |
||
632 | // |
||
633 | // Returnvalue: The function returns "0" if the last cluster has already been reached. |
||
634 | //________________________________________________________________________________________________________________________________________ |
||
635 | |||
636 | u16 GetNextCluster(File *file) |
||
637 | { |
||
638 | u32 fat_pointer = 0; |
||
639 | u32 fat_sector_offset = 0; |
||
640 | u32 ul_tmp = 0; |
||
641 | u8 retvalue = 0; // no new cluster found yet. |
||
642 | |||
643 | |||
644 | if((file->cluster_pointer >= RootDirectory) && (file->cluster_pointer < (RootDirectory + 31))) |
||
645 | { // Is the next cluster searched within the rootdirectory and available? |
||
646 | file->cluster_pointer++; // the rootdirectory is a linear adress space of 32 clusters. |
||
647 | retvalue = 1; // and the next cluster has been found. |
||
648 | } |
||
649 | else if(file->cluster_pointer > (RootDirectory + 31)) // The specified cluster is within the FAT. |
||
650 | { |
||
651 | fat_sector_offset = ((file->cluster_pointer) - (FirstDataCluster)); // Calculate index of actual cluster within the FAT. |
||
652 | fat_sector_offset /= SectorsPerCluster; // calculate the index of the actual sector within the FAT. |
||
653 | fat_sector_offset += 2; // In Fat16 clusterpositions have an offset of two. |
||
654 | fat_pointer = (fat_sector_offset%0x100); // Calculate the sector within the cluster. |
||
655 | fat_sector_offset = (fat_sector_offset>>8); // and the position within the sector. |
||
656 | |||
657 | SDC_GetSector((u32)(FileAllocationTable + fat_sector_offset),file->buffer); |
||
658 | file->sector_in_buffer = (FileAllocationTable + fat_sector_offset); // Mark that new sector has been read. |
||
659 | |||
660 | ul_tmp = (u32)file->buffer[((fat_pointer << 1)+1)]; // Read next sector information from calculated clusterposition. |
||
661 | ul_tmp = (ul_tmp << 8); |
||
662 | ul_tmp |= (u32)file->buffer[(fat_pointer << 1)]; |
||
663 | ul_tmp -=2; // next datacluster is clusterposition in fat - 2. |
||
664 | ul_tmp *= SectorsPerCluster; // calculate sectorposition of new cluster |
||
665 | ul_tmp += FirstDataCluster; // in relation to first datacluster of the disk. |
||
666 | |||
667 | if(ul_tmp < 0xfff7) // has a new cluster been read or was the end of the fat reached? |
||
668 | { |
||
669 | file->cluster_pointer = (u32) ul_tmp; // continue reading the file at the beginning of new datacluster. |
||
670 | retvalue = 1; // a new cluster was found. |
||
671 | } |
||
672 | } |
||
673 | return(retvalue); |
||
674 | } |
||
675 | |||
676 | //________________________________________________________________________________________________________________________________________ |
||
677 | // Funtion: u16 FindNextFreeCluster(void) |
||
678 | // |
||
679 | // Description: This function looks in the FAT to find the next free datacluster |
||
680 | // |
||
681 | // Returnvalue: The function returns the adress of the next free cluster found within the fAT. |
||
682 | //________________________________________________________________________________________________________________________________________ |
||
683 | |||
684 | u16 FindNextFreeCluster(File *file) |
||
685 | { |
||
686 | u32 fat_pointer = 0; // Pointer to the first sector of the FAT. |
||
687 | u32 ul_tmp = 0; // temporary variable used to calculate a sectornumber. |
||
688 | u16 fat_sector_offset = 0; // index to a sector within the FAT. |
||
689 | u16 fat_entry = 0; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
||
690 | u16 free_cluster = 0; // a pointer to the first sector of the next free cluster. |
||
691 | |||
692 | fat_pointer = (u32) FileAllocationTable; // start searching for empty cluster at the beginning of the fat. |
||
693 | // if the end of the fat is not reached yet and no free cluster has been found |
||
694 | while((fat_sector_offset < SectorsPerFat) && (!free_cluster)) |
||
695 | { |
||
696 | ul_tmp = (u32) ((u32)fat_pointer + (u32)fat_sector_offset); |
||
697 | SDC_GetSector((u32)ul_tmp,file->buffer); // read next sector of FAT. |
||
698 | file->sector_in_buffer = ul_tmp; // remember the number of the sector in FileBuffer. |
||
699 | Fat = (struct FatEntry *)file->buffer; |
||
700 | for(fat_entry=0;fat_entry<256;fat_entry++) // look for an free cluster at all entries in this sector of the fat. |
||
701 | { |
||
702 | if(Fat[fat_entry].next_cluster == 0x0000) // empty cluster found!! |
||
703 | { |
||
704 | Fat[fat_entry].next_cluster = 0xffff; // mark this fat-entry as used and save it to the device. |
||
705 | SDC_PutSector((u32)file->sector_in_buffer,file->buffer); |
||
706 | free_cluster = fat_entry; // the relative position of the free cluster found in this sector of the FAT. |
||
707 | free_cluster += (fat_sector_offset << 8); // calculate the absolute position of the free cluster in the FAT; |
||
708 | fat_entry = 256; // terminate the search for a free cluster in this sector. |
||
709 | } |
||
710 | } |
||
711 | fat_sector_offset++; |
||
712 | } |
||
713 | return(free_cluster); |
||
714 | } |
||
715 | |||
716 | //________________________________________________________________________________________________________________________________________ |
||
717 | // Funtion: u16 AppendCluster(File *file); |
||
718 | // |
||
719 | // Description: This function finds the next free datacluster on the disk and appends it to the specified file. |
||
720 | // |
||
721 | // Returnvalue: This funktion returns 1 if a cluster was appended to the specified file. |
||
722 | //________________________________________________________________________________________________________________________________________ |
||
723 | |||
724 | u8 AppendCluster(File *file) |
||
725 | { |
||
726 | u16 free_cluster = 0; |
||
727 | u32 fat_pointer = 0; |
||
728 | u8 retvalue = 0; |
||
729 | |||
730 | free_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
||
731 | if(free_cluster) retvalue = 1; // A free cluster was found and can be added to the end of the file. |
||
732 | fat_pointer = FileAllocationTable; // Set Pointer to the beginnig of the FAT. |
||
733 | fat_pointer += (u32)((u32)GetFatClusterOffset(file) >> 8); // find the sector in the FAT with 256 entries per sector. |
||
734 | |||
735 | SDC_GetSector(fat_pointer,file->buffer); |
||
736 | Fat = (struct FatEntry *)file->buffer; |
||
737 | Fat[GetFatSectorIndex(file)].next_cluster = free_cluster; // append the free cluster to the end of the file in the FAT. |
||
738 | SDC_PutSector((u32)fat_pointer,file->buffer); // save the modified sector to the FAT. |
||
739 | |||
740 | fat_pointer = (u32)free_cluster; |
||
741 | fat_pointer -= 2; |
||
742 | fat_pointer *= SectorsPerCluster; |
||
743 | fat_pointer += FirstDataCluster; |
||
744 | |||
745 | file->cluster_pointer = fat_pointer; // continue wrtiting to the file in the new and free datacluster. |
||
746 | return(retvalue); // return 1 when a new cluster was appended to the file |
||
747 | } |
||
748 | |||
749 | //________________________________________________________________________________________________________________________________________ |
||
750 | // Funtion: u16 GetFatClusterIndex(File *file); |
||
751 | // |
||
752 | // Description: This function returns the clusterindex of the cluster specified by file->cluster_pointer of the specified file. |
||
753 | // |
||
754 | //________________________________________________________________________________________________________________________________________ |
||
755 | |||
756 | u16 GetFatClusterOffset(File *file) |
||
757 | { |
||
758 | u32 fat_sector_offset = 0; |
||
759 | |||
760 | fat_sector_offset = ((file->cluster_pointer) - (FirstDataCluster)); // Calculate index of actual cluster in FAT. |
||
761 | fat_sector_offset /= SectorsPerCluster; |
||
762 | fat_sector_offset += 2; // In Fat16 clusterpositions have an offset of two. |
||
763 | |||
764 | return((u16)fat_sector_offset); |
||
765 | } |
||
766 | |||
767 | //________________________________________________________________________________________________________________________________________ |
||
768 | // Funtion: u16 GetFatSectorIndex(File *file); |
||
769 | // |
||
770 | // Description: This function returns the sectorindex of the cluster specified by file->cluster_pointer of the specified file. |
||
771 | // |
||
772 | //________________________________________________________________________________________________________________________________________ |
||
773 | |||
774 | u16 GetFatSectorIndex(File *file) |
||
775 | { |
||
776 | u16 fat_pointer = 0; |
||
777 | |||
778 | fat_pointer = GetFatClusterOffset(file); |
||
779 | fat_pointer = fat_pointer % 0x100; // Calculate the clusterposition in the fat |
||
780 | |||
781 | return(fat_pointer); |
||
782 | } |
||
783 | |||
784 | //________________________________________________________________________________________________________________________________________ |
||
785 | // Funtion: u16 CreateDirectoryEntry(u8 *, u16, u8 attrib) |
||
786 | // |
||
787 | // Description: This function looks for the next free position in the directory and creates an entry. The type of an directoryentry is |
||
788 | // specified by the attribute. |
||
789 | // bit0: unused |
||
790 | // bit1: archive |
||
791 | // bit2: read_only |
||
792 | // bit3: system |
||
793 | // bit4: directory |
||
794 | // bit5: volume |
||
795 | //________________________________________________________________________________________________________________________________________ |
||
796 | |||
797 | u8 CreateDirectoryEntry(u8 *fname, u16 cluster, File *file,u8 attrib) |
||
798 | { |
||
799 | u16 rootentry = 0; // index to an entry in the rootdirectory. |
||
800 | u16 cnt_enries_searched = 0; // count the number of rootentries which have been searched already. |
||
801 | u8 i = 0; |
||
802 | u16 sector_offset = 0; // index to the sector of the Rootentry which is searched momentarily |
||
803 | u8 retvalue = 0; |
||
804 | |||
805 | // directory starts at sector specified by dir_sector. This can be the rootdirectory or any other directory. |
||
806 | do |
||
807 | { // search the next 16 rootentries in this sector of the roordirectory. |
||
808 | rootentry=0; |
||
809 | SDC_GetSector((u32)(RootDirectory + sector_offset),file->buffer); // Read the Rootdirectory. |
||
810 | DirectoryEntry = (struct DirEntry *)file->buffer; |
||
811 | while((rootentry<16) && (!retvalue)) |
||
812 | { |
||
813 | if((DirectoryEntry[rootentry].attribute == 0) || (DirectoryEntry[rootentry].attribute == 0xE5)) // empty directory entry found |
||
814 | { |
||
815 | for(i=0;i<11;i++) DirectoryEntry[rootentry].name[i] = fname[i]; // Kopie the filename and the file extension to the directoryentry. |
||
816 | DirectoryEntry[rootentry].attribute = attrib; // Set the fileattribute to archive to reserve the directoryentry. |
||
817 | DirectoryEntry[rootentry].startcluster = cluster; // copy the location of the first datacluster to the directoryentry. |
||
818 | DirectoryEntry[rootentry].size = 0; // the new createted file has no content yet. |
||
819 | file->directory_sector = (u32) (RootDirectory + sector_offset); |
||
820 | file->directory_index = (u8) rootentry; |
||
821 | retvalue = 1; |
||
822 | SDC_PutSector((u32)(RootDirectory + sector_offset),file->buffer); |
||
823 | } |
||
824 | rootentry++; |
||
825 | cnt_enries_searched++; |
||
826 | } |
||
827 | if(!retvalue) // file not found in this sector so take next sector. |
||
828 | { |
||
829 | rootentry = 0; |
||
830 | sector_offset++; |
||
831 | } |
||
832 | } |
||
833 | while((cnt_enries_searched< PossibleRootEntries) && (!retvalue)); |
||
834 | |||
835 | return(retvalue); // return 1 if file has been created otherwise return 0. |
||
836 | } |
||
837 | |||
838 | //________________________________________________________________________________________________________________________________________ |
||
839 | // Funtion: u16 SeekDirectoryEntry(u8*, File *, u8) |
||
840 | // |
||
841 | // Description: this function searches all possible rootentries until the file or directory is found or the end of the rootdirectory is reached |
||
842 | // |
||
843 | // Returnvalue: This function returns 1 if the directoryentry specified was found. |
||
844 | //________________________________________________________________________________________________________________________________________ |
||
845 | |||
846 | u8 SeekDirectoryEntry(u8 *fname, File *file) |
||
847 | { |
||
848 | u16 rootentry=0; |
||
849 | u16 end_of_directory_not_reached = 0; // the directory has been read completely without a result. |
||
850 | u8 i=0; |
||
851 | u8 retvalue = 0; |
||
852 | u32 cluster_temp = 0; |
||
853 | u16 cnt=0; |
||
854 | |||
855 | // directory starts at sector specified by dir_sector. This can be the rootdirectory or any other directory. |
||
856 | do |
||
857 | { // search the next 16 rootentries in this sector of the roordirectory. |
||
858 | rootentry=0; |
||
859 | SDC_GetSector((u32) file->cluster_pointer,file->buffer); // Read the Rootdirectory. |
||
860 | DirectoryEntry = (struct DirEntry *)file->buffer; |
||
861 | |||
862 | while((!retvalue)&&(rootentry<16)) |
||
863 | { |
||
864 | cnt++; |
||
865 | |||
866 | i=0; |
||
867 | while((i<10)&&(DirectoryEntry[rootentry].name[i] == fname[i])) |
||
868 | { |
||
869 | i++; |
||
870 | } |
||
871 | if((i==10) && (DirectoryEntry[rootentry].attribute == file->attribute)) // entry found!! -> reading startcluster of entry from offset 26. |
||
872 | { |
||
873 | cluster_temp = (u32)DirectoryEntry[rootentry].startcluster; |
||
874 | cluster_temp -=2; // Clusterposition is ((position in FAT)-2). first two entries in FAT are reserved. |
||
875 | cluster_temp *= (u32)SectorsPerCluster; // Calculate positon of first cluster. |
||
876 | file->start_cluster = (FirstDataCluster + cluster_temp); |
||
877 | file->directory_sector = (u32) file->cluster_pointer; |
||
878 | file->cluster_pointer = file->start_cluster; // start reading the file with the first cluster. |
||
879 | file->filesize = (u32) DirectoryEntry[rootentry].size; |
||
880 | file->directory_index = (u8) rootentry; |
||
881 | retvalue = 1; |
||
882 | } |
||
883 | rootentry++; |
||
884 | } |
||
885 | if(!retvalue) // file not found in this sector so take next sector. |
||
886 | { |
||
887 | end_of_directory_not_reached = GetNextCluster(file); |
||
888 | } |
||
889 | } |
||
890 | while((end_of_directory_not_reached) && (!retvalue)); |
||
891 | return(retvalue); |
||
892 | } |
||
893 | |||
894 | //________________________________________________________________________________________________________________________________________ |
||
895 | // Funtion: void ScanSubDirectories(u8*, File *file); |
||
896 | // |
||
897 | // Description: This function scans the filename for subdirectories and changes the directory until the last directory is reached. |
||
898 | // here the specified file is searched. |
||
899 | // |
||
900 | // Returnvalue: |
||
901 | //________________________________________________________________________________________________________________________________________ |
||
902 | |||
903 | u8 ScanSubDirectories(u8 *fname, File *file) |
||
904 | { |
||
905 | u8 readpointer = 0; // pointer to read a character within the filepath. |
||
906 | u8 writepointer = 0; // pointer to write a character into the string dirname. |
||
907 | u8 dircnt = 0; // the number of subdirectories found in filepath. |
||
908 | u8 dirname[11]; // temporary variable containing the name of a directory within the filepath. |
||
909 | u8 retvalue = 1; // no error opening a subdirectory occured yet. |
||
910 | u8 cnt = 0; // maximun number of characters in a path is 256; |
||
911 | |||
912 | |||
913 | while((fname[readpointer]!=0) && (cnt < 255)) // search the string until the end is reached. |
||
914 | { |
||
915 | cnt++; |
||
916 | if((fname[readpointer] == '/') && readpointer) // subdirectory found. ignore first "/" as directory. |
||
917 | { |
||
918 | dircnt++; // count the number of subdirectories found within the filepath. |
||
919 | } |
||
920 | readpointer++; |
||
921 | } |
||
922 | |||
923 | for(writepointer=0;writepointer<10;writepointer++) dirname[writepointer] = ' '; |
||
924 | writepointer = 0; |
||
925 | readpointer = 0; // start scanning the string at the beginning. |
||
926 | |||
927 | file->cluster_pointer = RootDirectory; // always start searching in the rootdirectory. |
||
928 | file->attribute = _DIRECTORY; // the attribute of the item to be searched in the specified directory. |
||
929 | |||
930 | while(dircnt && retvalue) // scan all subdirectories found before. |
||
931 | { |
||
932 | if(fname[readpointer] != '/') // is the end of the subdirectory entry not reached yet? |
||
933 | { |
||
934 | if((fname[readpointer]>96) && (fname[readpointer]<123)) |
||
935 | { // all characters must be upper case. |
||
936 | dirname[writepointer]=(fname[readpointer] - 32); |
||
937 | } |
||
938 | else |
||
939 | { |
||
940 | dirname[writepointer]=fname[readpointer]; |
||
941 | } |
||
942 | writepointer++; |
||
943 | } |
||
944 | else |
||
945 | { |
||
946 | dircnt--; |
||
947 | if(!(SeekDirectoryEntry(dirname, file))) // was the seperated subdirectory not found? |
||
948 | { |
||
949 | retvalue = 0; // leave the function with return(0) otherwise continue with the next subdirectory until all directories have been searched. |
||
950 | } |
||
951 | for(writepointer=0;writepointer<10;writepointer++) dirname[writepointer] = ' '; |
||
952 | writepointer = 0; |
||
953 | } |
||
954 | readpointer++; |
||
955 | } |
||
956 | file->attribute = _FILE; // All subdirectories have been searched. the next thing to find is the specified file. |
||
957 | return(retvalue); |
||
958 | } |
||
959 | |||
960 | //________________________________________________________________________________________________________________________________________ |
||
961 | // Funtion: void SeperateFileName(u8*); |
||
962 | // |
||
963 | // Description: This function seperates the filename and the fileattribute and brings them into the needed format ('test.txt' -> 'TEST TXT'); |
||
964 | // |
||
965 | //________________________________________________________________________________________________________________________________________ |
||
966 | |||
967 | void SeperateFileName(u8 *fname, u8 *name) |
||
968 | { |
||
969 | u8 readpointer = 0; |
||
970 | u8 writepointer = 0; |
||
971 | u8 dircnt = 0; // the number of subdirectories found in filepath. |
||
972 | u8 fileindex = 0; // the position in the filenamestring where the last "/" is found. |
||
973 | |||
974 | while(fname[readpointer]!=0) // search the string until the end is reached. |
||
975 | { |
||
976 | if((fname[readpointer] == '/') && readpointer) // subdirectory found. ignore first "/" as directory. |
||
977 | { |
||
978 | dircnt++; // subdirectory entry found. |
||
979 | fileindex = (readpointer + 1); // store the index of the last slash found as the beginning of the filename. |
||
980 | } |
||
981 | readpointer++; |
||
982 | } |
||
983 | readpointer = fileindex; // start seperating the filename from the directory at the stored position. |
||
984 | dircnt = 0; |
||
985 | |||
986 | while((writepointer<=10) && (fname[readpointer]!=0)) // the rootdirectoryentry is 8bytes for filename and 3bytes for fileattribute. |
||
987 | { // the filename in the rootdirectory is in the format "TEST TXT" without the dot. |
||
988 | if(fname[readpointer]=='.') // seperating filename and attribute. |
||
989 | { |
||
990 | readpointer++; |
||
991 | writepointer=8; |
||
992 | } |
||
993 | else |
||
994 | { |
||
995 | if((fname[readpointer]>96) && (fname[readpointer]<123)) |
||
996 | { |
||
997 | name[writepointer]=(fname[readpointer] - 32); // all characters must be upper case. |
||
998 | } |
||
999 | else |
||
1000 | { |
||
1001 | name[writepointer]=fname[readpointer]; |
||
1002 | } |
||
1003 | readpointer++; |
||
1004 | writepointer++; |
||
1005 | } |
||
1006 | } |
||
1007 | } |