diff options
Diffstat (limited to 'sdk-modifications/libsrc/fs/directory.c')
| -rw-r--r-- | sdk-modifications/libsrc/fs/directory.c | 1005 |
1 files changed, 1005 insertions, 0 deletions
diff --git a/sdk-modifications/libsrc/fs/directory.c b/sdk-modifications/libsrc/fs/directory.c new file mode 100644 index 0000000..b30cccc --- /dev/null +++ b/sdk-modifications/libsrc/fs/directory.c @@ -0,0 +1,1005 @@ +/*
+ directory.c
+ Reading, writing and manipulation of the directory structure on
+ a FAT partition
+
+ Copyright (c) 2006 Michael "Chishm" Chisholm
+
+ Redistribution and use in source and binary forms, with or without modification,
+ are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+ 3. The name of the author may not be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ 2006-08-14 - Chishm
+ * entryFromPath correctly finds "" and "." now
+
+ 2006-08-17 - Chishm
+ * entryFromPath doesn't look for "" anymore - use "." to refer to the current directory
+
+ 2006-08-19 - Chishm
+ * Fixed entryFromPath bug when looking for "." in root directory
+
+ 2006-10-01 - Chishm
+ * Now clears the whole new cluster when linking in more clusters for a directory
+
+ 2006-10-28 - Chishm
+ * stat returns the hostType for the st_dev value
+*/
+//version 1.1
+//Note: fix bug in _FAT_directory_isValidAlias()
+
+#include <string.h>
+#include <ctype.h>
+
+#include "directory.h"
+#include "fs_common.h"
+#include "partition.h"
+#include "file_allocation_table.h"
+#include "bit_ops.h"
+#include "filetime.h"
+#include "fs_unicode.h"
+
+// Directory entry codes
+#define DIR_ENTRY_LAST 0x00
+#define DIR_ENTRY_FREE 0xE5
+
+
+// Long file name directory entry
+enum LFN_offset {
+ LFN_offset_ordinal = 0x00, // Position within LFN
+ LFN_offset_char0 = 0x01,
+ LFN_offset_char1 = 0x03,
+ LFN_offset_char2 = 0x05,
+ LFN_offset_char3 = 0x07,
+ LFN_offset_char4 = 0x09,
+ LFN_offset_flag = 0x0B, // Should be equal to ATTRIB_LFN
+ LFN_offset_reserved1 = 0x0C, // Always 0x00
+ LFN_offset_checkSum = 0x0D, // Checksum of short file name (alias)
+ LFN_offset_char5 = 0x0E,
+ LFN_offset_char6 = 0x10,
+ LFN_offset_char7 = 0x12,
+ LFN_offset_char8 = 0x14,
+ LFN_offset_char9 = 0x16,
+ LFN_offset_char10 = 0x18,
+ LFN_offset_reserved2 = 0x1A, // Always 0x0000
+ LFN_offset_char11 = 0x1C,
+ LFN_offset_char12 = 0x1E
+};
+const int LFN_offset_table[13]={0x01,0x03,0x05,0x07,0x09,0x0E,0x10,0x12,0x14,0x16,0x18,0x1C,0x1E};
+
+#define LFN_END 0x40
+#define LFN_DEL 0x80
+
+static char* strupr(char* a)
+{
+ char *str;
+
+ str = a;
+ while(*str)
+ {
+ if(*str >= 'a' && *str <= 'z') *str -= 0x20;
+ str += 1;
+ }
+
+ return a;
+}
+
+static char* strlwr(char *a){
+ char *str;
+
+ str = a;
+ while(*str)
+ {
+ if((*str) >= 'A' && (*str) <= 'Z') (*str) = ((*str) -'A' + 'a');
+ str++;
+ }
+ return a;
+}
+
+bool _FAT_directory_isValidLfn (const char* name) {
+ u32 i;
+ u32 nameLength;
+ // Make sure the name is short enough to be valid
+ if ( strnlen(name, MAX_FILENAME_LENGTH) >= MAX_FILENAME_LENGTH) {
+ return false;
+ }
+ // Make sure it doesn't contain any invalid characters
+ if (strpbrk (name, "\\/:*?\"<>|") != NULL) {
+ return false;
+ }
+
+ nameLength = strnlen(name, MAX_FILENAME_LENGTH);
+ // Make sure the name doesn't contain any control codes
+ for (i = 0; i < nameLength; i++) {
+ if ((unsigned char)name[i] < 0x20) {
+ return false;
+ }
+ }
+ // Otherwise it is valid
+ return true;
+}
+bool _FAT_directory_isValidAlias (const char* name) {
+ return false;//disables this function to preserve file name casing
+
+ u32 i;
+ u32 nameLength;
+ const char* dot;
+
+ // Make sure the name is short enough to be valid
+ if ( strnlen(name, MAX_ALIAS_LENGTH) >= MAX_ALIAS_LENGTH) {
+ return false;
+ }
+ // Make sure it doesn't contain any invalid characters
+ if (strpbrk (name, "\\/:;*?\"<>|&+,=[]") != NULL) {
+ return false;
+ }
+
+ //
+ if (strpbrk (name, " ") != NULL) {
+ return false;
+ }
+
+ nameLength = strnlen(name, MAX_ALIAS_LENGTH);
+ // Make sure the name doesn't contain any control codes
+ //if name isn't all capitals, then it is not a valid short name
+ for (i = 0; i < nameLength; i++) {
+ if (name[i] < 0x5A && name[i]!=0x20) {
+ return false;
+ }
+ }
+
+ dot = strchr ( name, '.');
+ // Make sure there is only one '.'
+ if ((dot != NULL) && (strrchr ( name, '.') != dot)) {
+ return false;
+ }
+ // If there is a '.':
+ if (dot != NULL) {
+ // Make sure the filename portion is 1-8 characters long
+ if (((dot - 1 - name) > 8) || ((dot - 1 - name) < 1)) {
+ return false;
+ }
+ // Make sure the extension is 1-3 characters long, if it exists
+ if ((strnlen(dot + 1, MAX_ALIAS_LENGTH) > 3) || (strnlen(dot + 1, MAX_ALIAS_LENGTH) < 1)) {
+ return false;
+ }
+ } else {
+ // Make sure the entire file name is 1-8 characters long
+ if ((nameLength > 8) || (nameLength < 1)) {
+ return false;
+ }
+ }
+
+ // Since we made it through all those tests, it must be valid
+ return true;
+}
+
+static bool _FAT_directory_entryGetAlias (const u8* entryData, char* destName) {
+ int i=0;
+ int j=0;
+
+ destName[0] = '\0';
+ if (entryData[0] != DIR_ENTRY_FREE) {
+ if (entryData[0] == '.') {
+ destName[0] = '.';
+ if (entryData[1] == '.') {
+ destName[1] = '.';
+ destName[2] = '\0';
+ } else {
+ destName[1] = '\0';
+ }
+ } else {
+ // Copy the filename from the dirEntry to the string
+ for (i = 0; (i < 8) && (entryData[DIR_ENTRY_name + i] != ' '); i++) {
+ destName[i] = entryData[DIR_ENTRY_name + i];
+ }
+ // Copy the extension from the dirEntry to the string
+ if (entryData[DIR_ENTRY_extension] != ' ') {
+ destName[i++] = '.';
+ for ( j = 0; (j < 3) && (entryData[DIR_ENTRY_extension + j] != ' '); j++) {
+ destName[i++] = entryData[DIR_ENTRY_extension + j];
+ }
+ }
+ destName[i] = '\0';
+ }
+ }
+
+ return (destName[0] != '\0');
+}
+
+u32 _FAT_directory_entryGetCluster (const u8* entryData) {
+ return u8array_to_u16(entryData,DIR_ENTRY_cluster) | (u8array_to_u16(entryData, DIR_ENTRY_clusterHigh) << 16);
+}
+
+static bool _FAT_directory_incrementDirEntryPosition (PARTITION* partition, DIR_ENTRY_POSITION* entryPosition, bool extendDirectory) {
+ DIR_ENTRY_POSITION position;
+ position = *entryPosition;
+ u32 tempCluster;
+
+ // Increment offset, wrapping at the end of a sector
+ ++ position.offset;
+ if (position.offset == BYTES_PER_READ / DIR_ENTRY_DATA_SIZE) {
+ position.offset = 0;
+ // Increment sector when wrapping
+ ++ position.sector;
+ // But wrap at the end of a cluster
+ if ((position.sector == partition->sectorsPerCluster) && (position.cluster != FAT16_ROOT_DIR_CLUSTER)) {
+ position.sector = 0;
+ // Move onto the next cluster, making sure there is another cluster to go to
+ tempCluster = _FAT_fat_nextCluster(partition, position.cluster);
+ if (tempCluster == CLUSTER_EOF) {
+ if (extendDirectory) {
+ tempCluster = _FAT_fat_linkFreeClusterCleared (partition, position.cluster);
+ if (tempCluster == CLUSTER_FREE) {
+ return false; // This will only happen if the disc is full
+ }
+ } else {
+ return false; // Got to the end of the directory, not extending it
+ }
+ }
+ position.cluster = tempCluster;
+ } else if ((position.cluster == FAT16_ROOT_DIR_CLUSTER) && (position.sector == (partition->dataStart - partition->rootDirStart))) {
+ return false; // Got to end of root directory, can't extend it
+ }
+ }
+ *entryPosition = position;
+ return true;
+}
+
+bool _FAT_directory_getNextEntry (PARTITION* partition, DIR_ENTRY* entry) {
+ DIR_ENTRY_POSITION entryStart;
+ DIR_ENTRY_POSITION entryEnd;
+
+ u8 entryData[0x20];
+
+ bool notFound, found;
+ u32 maxSectors;
+ int lfnPos;
+ u8 lfnChkSum, chkSum;
+ char* filename;
+ u16 unicodeFilename[256];
+ bool lfnExists;
+
+ int i;
+
+ lfnChkSum = 0;
+
+ entryStart = entry->dataEnd;
+
+ // Make sure we are using the correct root directory, in case of FAT32
+ if (entryStart.cluster == FAT16_ROOT_DIR_CLUSTER) {
+ entryStart.cluster = partition->rootDirCluster;
+ }
+
+ entryEnd = entryStart;
+ filename = entry->d_name;
+ //unicodeFilename = entry->unicodeFilename;
+ memset( unicodeFilename, 0, 512 );
+
+ // Can only be FAT16_ROOT_DIR_CLUSTER if it is the root directory on a FAT12 or FAT16 partition
+ if (entryStart.cluster == FAT16_ROOT_DIR_CLUSTER) {
+ maxSectors = partition->dataStart - partition->rootDirStart;
+ } else {
+ maxSectors = partition->sectorsPerCluster;
+ }
+
+ lfnExists = false;
+
+ found = false;
+ notFound = false;
+
+ while (!found && !notFound) {
+ if (_FAT_directory_incrementDirEntryPosition (partition, &entryEnd, false) == false) {
+ notFound = true;
+ }
+
+ _FAT_cache_readPartialSector (partition->cache, entryData, _FAT_fat_clusterToSector(partition, entryEnd.cluster) + entryEnd.sector, entryEnd.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+
+ if (entryData[DIR_ENTRY_attributes] == ATTRIB_LFN) {
+ // It's an LFN
+ if (entryData[LFN_offset_ordinal] & LFN_DEL) {
+ lfnExists = false;
+ } else if (entryData[LFN_offset_ordinal] & LFN_END) {
+ // Last part of LFN, make sure it isn't deleted using previous if(Thanks MoonLight)
+ entryStart = entryEnd; // This is the start of a directory entry
+ lfnExists = true;
+ //filename[(entryData[LFN_offset_ordinal] & ~LFN_END) * 13] = '\0'; // Set end of lfn to null character
+ unicodeFilename[(entryData[LFN_offset_ordinal] & ~LFN_END) * 13] = 0x0000;
+ lfnChkSum = entryData[LFN_offset_checkSum];
+ } if (lfnChkSum != entryData[LFN_offset_checkSum]) {
+ lfnExists = false;
+ }
+ //unicodeFilename[0] = 0x0000;
+ if (lfnExists) {
+ lfnPos = ((entryData[LFN_offset_ordinal] & ~LFN_END) - 1) * 13;
+ for (i = 0; i < 13; i++) {
+ unicodeFilename[lfnPos + i] = u8array_to_u16( entryData, LFN_offset_table[i]);
+ // | entryData[LFN_offset_table[i]+1]<<8; // modify this for unicode support;
+ }
+ }
+ } else if (entryData[DIR_ENTRY_attributes] & ATTRIB_VOL) {
+ // This is a volume name, don't bother with it
+ } else if (entryData[0] == DIR_ENTRY_LAST) {
+ notFound = true;
+ } else if ((entryData[0] != DIR_ENTRY_FREE) && (entryData[0] > 0x20) && !(entryData[DIR_ENTRY_attributes] & ATTRIB_VOL)) {
+ if (lfnExists) {
+ // Calculate file checksum
+ chkSum = 0;
+ for (i=0; i < 11; i++) {
+ // NOTE: The operation is an unsigned char rotate right
+ chkSum = ((chkSum & 1) ? 0x80 : 0) + (chkSum >> 1) + entryData[i];
+ }
+ if (chkSum != lfnChkSum) {
+ lfnExists = false;
+ //filename[0] = '\0';
+ //unicodeFilename[0] = 0x0000; // move this line to below(1)
+ }
+ }
+ //short name
+ if (!lfnExists) {
+ entryStart = entryEnd;
+ unicodeFilename[0] = 0x0000; // (1)make sure clear previous search junk
+ // get alias anyway
+ _FAT_directory_entryGetAlias (entryData, filename);
+ strlwr(filename);//convert to lowercase characters
+ }
+ //long name
+ else
+ {
+ _FAT_unicode16_to_utf8 (unicodeFilename, filename);
+ }
+
+ found = true;
+ }
+ }
+
+ // If no file is found, return false
+ if (notFound) {
+ return false;
+ } else {
+ // Fill in the directory entry struct
+ entry->dataStart = entryStart;
+ entry->dataEnd = entryEnd;
+ memcpy (entry->entryData, entryData, DIR_ENTRY_DATA_SIZE);
+ return true;
+ }
+}
+
+bool _FAT_directory_getFirstEntry (PARTITION* partition, DIR_ENTRY* entry, u32 dirCluster) {
+ entry->dataStart.cluster = dirCluster;
+ entry->dataStart.sector = 0;
+ entry->dataStart.offset = -1; // Start before the beginning of the directory
+
+ entry->dataEnd = entry->dataStart;
+
+ return _FAT_directory_getNextEntry (partition, entry);
+}
+
+bool _FAT_directory_getRootEntry (PARTITION* partition, DIR_ENTRY* entry) {
+ entry->dataStart.cluster = 0;
+ entry->dataStart.sector = 0;
+ entry->dataStart.offset = 0;
+
+ entry->dataEnd = entry->dataStart;
+
+ memset (entry->d_name, '\0', MAX_FILENAME_LENGTH);
+ entry->d_name[0] = '.';
+
+ memset (entry->entryData, 0, DIR_ENTRY_DATA_SIZE);
+ memset (entry->entryData, ' ', 11);
+ entry->entryData[0] = '.';
+
+ entry->entryData[DIR_ENTRY_attributes] = ATTRIB_DIR;
+
+ u16_to_u8array (entry->entryData, DIR_ENTRY_cluster, partition->rootDirCluster);
+ u16_to_u8array (entry->entryData, DIR_ENTRY_clusterHigh, partition->rootDirCluster >> 16);
+
+ return true;
+}
+
+bool _FAT_directory_entryFromPosition (PARTITION* partition, DIR_ENTRY* entry) {
+ DIR_ENTRY_POSITION entryStart;
+ DIR_ENTRY_POSITION entryEnd;
+ entryStart = entry->dataStart;
+ entryEnd = entry->dataEnd;
+ bool entryStillValid;
+ bool finished;
+
+ int i;
+ int lfnPos;
+
+ u8 entryData[DIR_ENTRY_DATA_SIZE];
+
+ memset (entry->d_name, '\0', MAX_FILENAME_LENGTH);
+
+ // Create an empty directory entry to overwrite the old ones with
+ for ( entryStillValid = true, finished = false;
+ entryStillValid && !finished;
+ entryStillValid = _FAT_directory_incrementDirEntryPosition (partition, &entryStart, false))
+ {
+ _FAT_cache_readPartialSector (partition->cache, entryData,
+ _FAT_fat_clusterToSector(partition, entryStart.cluster) + entryStart.sector,
+ entryStart.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+
+ if ((entryStart.cluster == entryEnd.cluster)
+ && (entryStart.sector == entryEnd.sector)
+ && (entryStart.offset == entryEnd.offset)) {
+ // Copy the entry data and stop, since this is the last section of the directory entry
+ memcpy (entry->entryData, entryData, DIR_ENTRY_DATA_SIZE);
+ finished = true;
+ } else {
+ // Copy the long file name data
+ lfnPos = ((entryData[LFN_offset_ordinal] & ~LFN_END) - 1) * 13;
+ for (i = 0; i < 13; i++) {
+ entry->d_name[lfnPos + i] = entryData[LFN_offset_table[i]]; // modify this for unicode support;
+ }
+ }
+ }
+
+ if (!entryStillValid) {
+ return false;
+ }
+
+ if ((entryStart.cluster == entryEnd.cluster)
+ && (entryStart.sector == entryEnd.sector)
+ && (entryStart.offset == entryEnd.offset)) {
+ // Since the entry doesn't have a long file name, extract the short filename
+ if (!_FAT_directory_entryGetAlias (entry->entryData, entry->d_name)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool _FAT_directory_entryFromPath (PARTITION* partition, DIR_ENTRY* entry, const char* path, const char* pathEnd) {
+ size_t dirnameLength;
+ const char* pathPosition;
+ const char* nextPathPosition;
+
+ //size_t uniDirnameLength;
+ //u16 uniPath[MAX_FILENAME_LENGTH];
+ //const u16 * uniPathPosition;
+ //const u16 * uniNextPathPosition;
+
+ u32 dirCluster;
+ bool foundFile;
+
+ //char alias[MAX_ALIAS_LENGTH];
+
+ bool found, notFound;
+
+ //_FAT_utf8_to_unicode16( path, uniPath );
+ pathPosition = path;
+ //uniPathPosition = uniPath;
+
+ found = false;
+ notFound = false;
+
+ if (pathEnd == NULL) {
+ // Set pathEnd to the end of the path string
+ pathEnd = strchr (path, '\0');
+ }
+
+ if (pathPosition[0] == DIR_SEPARATOR) {
+ // Start at root directory
+ dirCluster = partition->rootDirCluster;
+ // Consume separator(s)
+ while (pathPosition[0] == DIR_SEPARATOR) {
+ pathPosition++;
+ }
+
+ //while (uniPathPosition[0] == (unsigned short)DIR_SEPARATOR) {
+ // uniPathPosition++;
+ //}
+
+ if (pathPosition >= pathEnd) {
+ _FAT_directory_getRootEntry (partition, entry);
+ found = true;
+ }
+ } else {
+ // Start in current working directory
+ dirCluster = partition->cwdCluster;
+ }
+
+ // If the path is only specifying a directory in the form "."
+ // and this is the root directory, return it
+ //if ((dirCluster == partition->rootDirCluster) && (strncasecmp(".", pathPosition, 2) == 0)) {
+ if ((dirCluster == partition->rootDirCluster) && strlen(pathPosition) == 1 && (strcasecmp(".", pathPosition) == 0)) {
+ _FAT_directory_getRootEntry (partition, entry);
+ found = true;
+ }
+
+ while (!found && !notFound) {
+ // Get the name of the next required subdirectory within the path
+ nextPathPosition = strchr (pathPosition, DIR_SEPARATOR);
+ //uniNextPathPosition = _unistrchr( uniPathPosition, (unsigned short)DIR_SEPARATOR );
+ if (nextPathPosition != NULL) {
+ dirnameLength = nextPathPosition - pathPosition;
+ } else {
+ dirnameLength = strlen(pathPosition);
+ }
+ //if (uniNextPathPosition != 0x0000) {
+ // uniDirnameLength = uniNextPathPosition - uniPathPosition;
+ //} else {
+ // uniDirnameLength = _unistrnlen(uniPathPosition, MAX_FILENAME_LENGTH);
+ //}
+
+ if (dirnameLength > MAX_FILENAME_LENGTH) {
+ // The path is too long to bother with
+ return false;
+ }
+ //if( uniDirnameLength > MAX_FILENAME_LENGTH ) {
+ // return false;
+ //}
+
+ // Look for the directory within the path
+ foundFile = _FAT_directory_getFirstEntry (partition, entry, dirCluster);
+
+ while (foundFile && !found && !notFound) { // It hasn't already found the file
+ // Check if the filename matches
+ //if ((uniDirnameLength == _unistrnlen(entry->unicodeFilename, MAX_FILENAME_LENGTH))
+ // && (_unistrncmp(entry->unicodeFilename, uniPathPosition, uniDirnameLength) == 0)) {
+ // found = true;
+ //}
+
+ //if(!strncasecmp(entry->d_name, pathPosition, dirnameLength))
+ if(strlen(entry->d_name) == dirnameLength && !strncasecmp(entry->d_name, pathPosition, dirnameLength))
+ found = true;
+
+ // Check if the alias matches
+ //_FAT_directory_entryGetAlias (entry->entryData, alias);
+ //if ((dirnameLength == strnlen(alias, MAX_ALIAS_LENGTH))
+ // && (strncasecmp(alias, pathPosition, dirnameLength) == 0)) {
+ // found = true;
+ //}
+
+ if (found && !(entry->entryData[DIR_ENTRY_attributes] & ATTRIB_DIR) && (nextPathPosition != NULL)) {
+ // Make sure that we aren't trying to follow a file instead of a directory in the path
+ found = false;
+ }
+
+ if (!found) {
+ foundFile = _FAT_directory_getNextEntry (partition, entry);
+ }
+ }
+
+ if (!foundFile) {
+ // Check that the search didn't get to the end of the directory
+ notFound = true;
+ found = false;
+ } else if ((nextPathPosition == NULL) || (nextPathPosition >= pathEnd)) {
+ // Check that we reached the end of the path
+ found = true;
+ } else if (entry->entryData[DIR_ENTRY_attributes] & ATTRIB_DIR) {
+ dirCluster = _FAT_directory_entryGetCluster (entry->entryData);
+ pathPosition = nextPathPosition;
+ //uniPathPosition = uniNextPathPosition;
+ // Consume separator(s)
+ while (pathPosition[0] == DIR_SEPARATOR) {
+ pathPosition++;
+ }
+ //while (uniPathPosition[0] == (unsigned short)DIR_SEPARATOR) {
+ // uniPathPosition++;
+ //}
+ // The requested directory was found
+ if (pathPosition >= pathEnd) {
+ found = true;
+ } else {
+ found = false;
+ }
+ }
+ }
+
+ if (found && !notFound) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+bool _FAT_directory_removeEntry (PARTITION* partition, DIR_ENTRY* entry) {
+ DIR_ENTRY_POSITION entryStart;
+ DIR_ENTRY_POSITION entryEnd;
+ entryStart = entry->dataStart;
+ entryEnd = entry->dataEnd;
+ bool entryStillValid;
+ bool finished;
+
+ u8 entryData[DIR_ENTRY_DATA_SIZE];
+
+ // Create an empty directory entry to overwrite the old ones with
+ for ( entryStillValid = true, finished = false;
+ entryStillValid && !finished;
+ entryStillValid = _FAT_directory_incrementDirEntryPosition (partition, &entryStart, false))
+ {
+ _FAT_cache_readPartialSector (partition->cache, entryData, _FAT_fat_clusterToSector(partition, entryStart.cluster) + entryStart.sector, entryStart.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+ entryData[0] = DIR_ENTRY_FREE;
+ _FAT_cache_writePartialSector (partition->cache, entryData, _FAT_fat_clusterToSector(partition, entryStart.cluster) + entryStart.sector, entryStart.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+ if ((entryStart.cluster == entryEnd.cluster) && (entryStart.sector == entryEnd.sector) && (entryStart.offset == entryEnd.offset)) {
+ finished = true;
+ }
+ }
+
+ if (!entryStillValid) {
+ return false;
+ }
+
+ return true;
+}
+
+static bool _FAT_directory_findEntryGap (PARTITION* partition, DIR_ENTRY* entry, u32 dirCluster, u32 size) {
+ DIR_ENTRY_POSITION gapStart;
+ DIR_ENTRY_POSITION gapEnd;
+
+ u8 entryData[DIR_ENTRY_DATA_SIZE];
+
+ u32 dirEntryRemain;
+
+ bool endOfDirectory, entryStillValid;
+
+ // Scan Dir for free entry
+ gapEnd.offset = 0;
+ gapEnd.sector = 0;
+ gapEnd.cluster = dirCluster;
+
+ gapStart = gapEnd;
+
+ entryStillValid = true;
+ dirEntryRemain = size;
+ endOfDirectory = false;
+
+ while (entryStillValid && !endOfDirectory && (dirEntryRemain > 0)) {
+ _FAT_cache_readPartialSector (partition->cache, entryData, _FAT_fat_clusterToSector(partition, gapEnd.cluster) + gapEnd.sector, gapEnd.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+ if (entryData[0] == DIR_ENTRY_LAST) {
+ gapStart = gapEnd;
+ -- dirEntryRemain;
+ endOfDirectory = true;
+ } else if (entryData[0] == DIR_ENTRY_FREE) {
+ if (dirEntryRemain == size) {
+ gapStart = gapEnd;
+ }
+ -- dirEntryRemain;
+ } else {
+ dirEntryRemain = size;
+ }
+
+ if (!endOfDirectory && (dirEntryRemain > 0)) {
+ entryStillValid = _FAT_directory_incrementDirEntryPosition (partition, &gapEnd, true);
+ }
+ }
+
+ // Make sure the scanning didn't fail
+ if (!entryStillValid) {
+ return false;
+ }
+
+ // Save the start entry, since we know it is valid
+ entry->dataStart = gapStart;
+
+ if (endOfDirectory) {
+ memset (entryData, DIR_ENTRY_LAST, DIR_ENTRY_DATA_SIZE);
+ dirEntryRemain += 1; // Increase by one to take account of End Of Directory Marker
+ while ((dirEntryRemain > 0) && entryStillValid) {
+ // Get the gapEnd before incrementing it, so the second to last one is saved
+ entry->dataEnd = gapEnd;
+ // Increment gapEnd, moving onto the next entry
+ entryStillValid = _FAT_directory_incrementDirEntryPosition (partition, &gapEnd, true);
+ -- dirEntryRemain;
+ // Fill the entry with blanks
+ _FAT_cache_writePartialSector (partition->cache, entryData, _FAT_fat_clusterToSector(partition, gapEnd.cluster) + gapEnd.sector, gapEnd.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+ }
+ if (!entryStillValid) {
+ return false;
+ }
+ } else {
+ entry->dataEnd = gapEnd;
+ }
+
+ return true;
+}
+
+static bool _FAT_directory_entryExists (PARTITION* partition, const char* name, u32 dirCluster) {
+ DIR_ENTRY tempEntry;
+ bool foundFile;
+ //char alias[MAX_ALIAS_LENGTH];
+ u32 dirnameLength;
+ //u16 unicodeName[MAX_FILENAME_LENGTH];
+
+ dirnameLength = strnlen(name, MAX_FILENAME_LENGTH);
+
+ if (dirnameLength >= MAX_FILENAME_LENGTH) {
+ return false;
+ }
+
+ //_FAT_utf8_to_unicode16( name, unicodeName );
+
+ // Make sure the entry doesn't already exist
+ foundFile = _FAT_directory_getFirstEntry (partition, &tempEntry, dirCluster);
+
+ while (foundFile) { // It hasn't already found the file
+ // Check if the filename matches
+ //if (/*(dirnameLength == _unistrnlen(tempEntry.unicodeFilename, MAX_FILENAME_LENGTH))*/
+ // //&& (strcasecmp(tempEntry.filename, name) == 0)) {
+ // /*&&*/ (_unistrncmp( unicodeName, tempEntry.unicodeFilename, MAX_FILENAME_LENGTH ) == 0 ))
+ //{
+ // return true;
+ //}
+ //if(!strncasecmp(name, tempEntry.d_name, dirnameLength))
+ if(!strcasecmp(name, tempEntry.d_name))
+ return true;
+
+ // Check if the alias matches
+ //_FAT_directory_entryGetAlias (tempEntry.entryData, alias);
+ //if ((dirnameLength == strnlen(alias, MAX_ALIAS_LENGTH))
+ // && (strcasecmp(alias, name) == 0)) {
+ // return true;
+ //}
+ foundFile = _FAT_directory_getNextEntry (partition, &tempEntry);
+ }
+ return false;
+}
+
+
+
+bool _FAT_directory_addEntry (PARTITION* partition, DIR_ENTRY* entry, u32 dirCluster) {
+ u32 entrySize;
+ u8 lfnEntry[DIR_ENTRY_DATA_SIZE];
+ s32 i,j; // Must be signed for use when decrementing in for loop
+ char *tmpCharPtr;
+ DIR_ENTRY_POSITION curEntryPos;
+ bool entryStillValid;
+ u8 aliasCheckSum = 0;
+ char alias [MAX_ALIAS_LENGTH];
+ u16 unicodeFilename[256];
+
+ // Make sure the filename is not 0 length
+ if (strnlen (entry->d_name, MAX_FILENAME_LENGTH) < 1) {
+ return false;
+ }
+ // Make sure the filename is at least a valid LFN
+ if ( !(_FAT_directory_isValidLfn (entry->d_name))) {
+ return false;
+ }
+
+ // Remove trailing spaces
+ for (i = strlen (entry->d_name) - 1; (i > 0) && (entry->d_name[i] == ' '); --i) {
+ entry->d_name[i] = '\0';
+ }
+ // Remove leading spaces
+ for (i = 0; (i < strlen (entry->d_name)) && (entry->d_name[i] == ' '); ++i) ;
+ if (i > 0) {
+ memmove (entry->d_name, entry->d_name + i, strlen (entry->d_name + i));
+ }
+
+ // Remove junk in filename
+ i = strlen (entry->d_name);
+ memset (entry->d_name + i, '\0', MAX_FILENAME_LENGTH - i);
+
+ // Make sure the entry doesn't already exist
+ if (_FAT_directory_entryExists (partition, entry->d_name, dirCluster)) {
+ return false;
+ }
+
+ // Clear out alias, so we can generate a new one
+ memset (entry->entryData, ' ', 11);
+
+ if ( strncmp(entry->d_name, ".", MAX_FILENAME_LENGTH) == 0) {
+ // "." entry
+ entry->entryData[0] = '.';
+ entrySize = 1;
+ } else if ( strncmp(entry->d_name, "..", MAX_FILENAME_LENGTH) == 0) {
+ // ".." entry
+ entry->entryData[0] = '.';
+ entry->entryData[1] = '.';
+ entrySize = 1;
+ }else if (_FAT_directory_isValidAlias (entry->d_name)) {
+ entrySize = 1;
+ // Copy into alias
+ for (i = 0, j = 0; (j < 8) && (entry->d_name[i] != '.') && (entry->d_name[i] != '\0'); i++, j++) {
+ entry->entryData[j] = entry->d_name[i];
+ }
+ while (j < 8) {
+ entry->entryData[j] = ' ';
+ ++ j;
+ }
+ if (entry->d_name[i] == '.') {
+ // Copy extension
+ ++ i;
+ while ((entry->d_name[i] != '\0') && (j < 11)) {
+ entry->entryData[j] = entry->d_name[i];
+ ++ i;
+ ++ j;
+ }
+ }
+ while (j < 11) {
+ entry->entryData[j] = ' ';
+ ++ j;
+ }
+ // Short filename
+ strupr (entry->d_name);
+ }else {
+ // Long filename needed
+ //memset( entry->unicodeFilename, 0, 512 );
+ //_FAT_utf8_to_unicode16( (const char*)entry->d_name, entry->unicodeFilename );
+ memset( unicodeFilename, 0, 512 );
+ _FAT_utf8_to_unicode16( (const char*)entry->d_name, unicodeFilename );
+
+ //entrySize = ((strnlen (entry->filename, MAX_FILENAME_LENGTH) + LFN_ENTRY_LENGTH - 1) / LFN_ENTRY_LENGTH) + 1;
+ //entrySize = ((_unistrnlen( entry->unicodeFilename, MAX_FILENAME_LENGTH ) + LFN_ENTRY_LENGTH - 1) / LFN_ENTRY_LENGTH) + 1;
+ entrySize = ((_unistrnlen( unicodeFilename, MAX_FILENAME_LENGTH ) + LFN_ENTRY_LENGTH - 1) / LFN_ENTRY_LENGTH) + 1;
+
+ // Generate alias
+ tmpCharPtr = strrchr (entry->d_name, '.');
+ if (tmpCharPtr == NULL) {
+ tmpCharPtr = strrchr (entry->d_name, '\0');
+ }
+ for (i = 0, j = 0; (j < 6) && (entry->d_name + i < tmpCharPtr); i++) {
+ if ( _uniisalnum((u8)(entry->d_name[i]))) {
+ alias[j] = entry->d_name[i];
+ ++ j;
+ }
+ }
+ while (j < 8) {
+ alias[j] = '_';
+ ++ j;
+ }
+ tmpCharPtr = strrchr (entry->d_name, '.');
+ if (tmpCharPtr != NULL) {
+ alias[8] = '.';
+ // Copy extension
+ while ((tmpCharPtr != '\0') && (j < 12)) {
+ alias[j] = tmpCharPtr[0];
+ ++ tmpCharPtr;
+ ++ j;
+ }
+ alias[j] = '\0';
+ } else {
+ for (j = 8; j < MAX_ALIAS_LENGTH; j++) {
+ alias[j] = '\0';
+ }
+ }
+
+ // Get a valid tail number
+ alias[5] = '~';
+ i = 0;
+ do {
+ i++;
+ alias[6] = '0' + ((i / 10) % 10); // 10's digit
+ alias[7] = '0' + (i % 10); // 1's digit
+ } while (_FAT_directory_entryExists (partition, alias, dirCluster) && (i < 100));
+ if (i == 100) {
+ // Couldn't get a tail number
+ return false;
+ }
+
+ // Make it upper case
+ strupr (alias);
+
+ // Now copy it into the directory entry data
+ memcpy (entry->entryData, alias, 8);
+ memcpy (entry->entryData + 8, alias + 9, 3);
+ for (i = 0; i < 10; i++) {
+ if (entry->entryData[i] < 0x20) {
+ // Replace null and control characters with spaces
+ entry->entryData[i] = 0x20;
+ }
+ }
+ // Generate alias checksum
+ for (i=0; i < 11; i++)
+ {
+ // NOTE: The operation is an unsigned char rotate right
+ aliasCheckSum = ((aliasCheckSum & 1) ? 0x80 : 0) + (aliasCheckSum >> 1) + entry->entryData[i];
+ }
+
+ }
+
+ // Find or create space for the entry
+ if (_FAT_directory_findEntryGap (partition, entry, dirCluster, entrySize) == false) {
+ return false;
+ }
+
+ // Write out directory entry
+ curEntryPos = entry->dataStart;
+
+ for (entryStillValid = true, i = entrySize; entryStillValid && i > 0;
+ entryStillValid = _FAT_directory_incrementDirEntryPosition (partition, &curEntryPos, false), -- i )
+ {
+ if (i > 1) {
+ // Long filename entry
+ lfnEntry[LFN_offset_ordinal] = (i - 1) | (i == entrySize ? LFN_END : 0);
+ for (j = 0; j < 13; j++) {
+ //if (entry->unicodeFilename[(i - 2) * 13 + j] == '\0') {
+ if (unicodeFilename[(i - 2) * 13 + j] == '\0') {
+ //if ((j > 1) && (entry->unicodeFilename[(i - 2) * 13 + (j-1)] == '\0')) {
+ if ((j > 1) && (unicodeFilename[(i - 2) * 13 + (j-1)] == '\0')) {
+ u16_to_u8array (lfnEntry, LFN_offset_table[j], 0xffff); // Padding
+ } else {
+ u16_to_u8array (lfnEntry, LFN_offset_table[j], 0x0000); // Terminating null character
+ }
+ } else {
+ //u16_to_u8array (lfnEntry, LFN_offset_table[j], entry->unicodeFilename[(i - 2) * 13 + j]);
+ u16_to_u8array (lfnEntry, LFN_offset_table[j], unicodeFilename[(i - 2) * 13 + j]);
+ }
+ }
+
+ lfnEntry[LFN_offset_checkSum] = aliasCheckSum;
+ lfnEntry[LFN_offset_flag] = ATTRIB_LFN;
+ lfnEntry[LFN_offset_reserved1] = 0;
+ u16_to_u8array (lfnEntry, LFN_offset_reserved2, 0);
+ _FAT_cache_writePartialSector (partition->cache, lfnEntry, _FAT_fat_clusterToSector(partition, curEntryPos.cluster) + curEntryPos.sector, curEntryPos.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+ } else {
+ // Alias & file data
+ _FAT_cache_writePartialSector (partition->cache, entry->entryData, _FAT_fat_clusterToSector(partition, curEntryPos.cluster) + curEntryPos.sector, curEntryPos.offset * DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
+ }
+ }
+
+ return true;
+}
+
+bool _FAT_directory_chdir (PARTITION* partition, const char* path) {
+ DIR_ENTRY entry;
+
+ if (!_FAT_directory_entryFromPath (partition, &entry, path, NULL)) {
+ return false;
+ }
+
+ if (!(entry.entryData[DIR_ENTRY_attributes] & ATTRIB_DIR)) {
+ return false;
+ }
+
+ partition->cwdCluster = _FAT_directory_entryGetCluster (entry.entryData);
+
+ return true;
+}
+
+void _FAT_directory_entryStat (PARTITION* partition, DIR_ENTRY* entry, struct stat *st) {
+ // Fill in the stat struct
+ // Some of the values are faked for the sake of compatibility
+ st->st_dev = _FAT_disc_hostType(partition->disc); // The device is the 32bit ioType value
+ st->st_ino = (ino_t)(_FAT_directory_entryGetCluster(entry->entryData)); // The file serial number is the start cluster
+ st->st_mode = (_FAT_directory_isDirectory(entry) ? S_IFDIR : S_IFREG) |
+ (S_IRUSR | S_IRGRP | S_IROTH) |
+ (_FAT_directory_isWritable (entry) ? (S_IWUSR | S_IWGRP | S_IWOTH) : 0) |
+ (_FAT_directory_isHidden (entry) ? S_IHIDDEN : 0); // Mode bits based on dirEntry ATTRIB byte
+ st->st_nlink = 1; // Always one hard link on a FAT file
+ st->st_uid = 1; // Faked for FAT
+ st->st_gid = 2; // Faked for FAT
+ st->st_rdev = st->st_dev;
+ st->st_size = u8array_to_u32 (entry->entryData, DIR_ENTRY_fileSize); // File size
+ st->st_atime = _FAT_filetime_to_time_t (
+ 0,
+ u8array_to_u16 (entry->entryData, DIR_ENTRY_aDate)
+ );
+ //st->st_spare1 = _FAT_directory_isHidden (entry);
+ st->st_mtime = _FAT_filetime_to_time_t (
+ u8array_to_u16 (entry->entryData, DIR_ENTRY_mTime),
+ u8array_to_u16 (entry->entryData, DIR_ENTRY_mDate)
+ );
+ //st->st_spare2 = 0;
+ st->st_ctime = _FAT_filetime_to_time_t (
+ u8array_to_u16 (entry->entryData, DIR_ENTRY_cTime),
+ u8array_to_u16 (entry->entryData, DIR_ENTRY_cDate)
+ );
+ //st->st_spare3 = 0;
+ st->st_blksize = BYTES_PER_READ; // Prefered file I/O block size
+ st->st_blocks = (st->st_size + BYTES_PER_READ - 1) / BYTES_PER_READ; // File size in blocks
+// st->st_spare4[0] = 0;
+// st->st_spare4[1] = 0;
+}
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