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https://github.com/wiidev/usbloadergx.git
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64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#include "fatfile.h"
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <unistd.h>
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#include "cache.h"
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#include "file_allocation_table.h"
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#include "bit_ops.h"
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#include "filetime.h"
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#include "lock.h"
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#include "fatfile_frag.h"
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int _FAT_get_fragments (const char *path, _fat_frag_append_t append_fragment, void *callback_data)
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{
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struct _reent r;
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FILE_STRUCT file;
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PARTITION* partition;
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u32 cluster;
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u32 sector;
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u32 offset; // in sectors
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u32 size; // in sectors
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int ret = -1;
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int fd;
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fd = _FAT_open_r (&r, &file, path, O_RDONLY, 0);
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if (fd == -1) return -1;
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if (fd != (int)&file) return -1;
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partition = file.partition;
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_FAT_lock(&partition->lock);
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size = file.filesize / partition->bytesPerSector;
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cluster = file.startCluster;
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offset = 0;
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do {
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if (!_FAT_fat_isValidCluster(partition, cluster)) {
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// invalid cluster
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goto out;
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}
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// add cluster to fileinfo
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sector = _FAT_fat_clusterToSector(partition, cluster);
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if (append_fragment(callback_data, offset, sector, partition->sectorsPerCluster)) {
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// too many fragments
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goto out;
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}
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offset += partition->sectorsPerCluster;
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cluster = _FAT_fat_nextCluster (partition, cluster);
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} while (offset < size);
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// set size
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append_fragment(callback_data, size, 0, 0);
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// success
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ret = 0;
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out:
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_FAT_unlock(&partition->lock);
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_FAT_close_r(&r, (void *)fd);
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return ret;
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}
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