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64 lines
1.8 KiB
64 lines
1.8 KiB
/* ----------------------------------------------------------------------- * |
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* |
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* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330, |
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* Boston MA 02111-1307, USA; either version 2 of the License, or |
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* (at your option) any later version; incorporated herein by reference. |
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* |
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* ----------------------------------------------------------------------- */ |
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/* |
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* searchdir.c |
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* |
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* Search a FAT directory for a particular pre-mangled filename. |
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* Copies the directory entry into direntry and returns the starting cluster |
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* if found; returns -2 on not found, -1 on error, 0 on empty file. |
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*/ |
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#include <string.h> |
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#include "libfatint.h" |
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int32_t libfat_searchdir(struct libfat_filesystem *fs, int32_t dirclust, |
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const void *name, struct libfat_direntry *direntry) |
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{ |
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struct fat_dirent *dep; |
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int nent; |
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libfat_sector_t s = libfat_clustertosector(fs, dirclust); |
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while (1) { |
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if (s == 0) |
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return -2; /* Not found */ |
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else if (s == (libfat_sector_t) - 1) |
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return -1; /* Error */ |
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dep = libfat_get_sector(fs, s); |
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if (!dep) |
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return -1; /* Read error */ |
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for (nent = 0; nent < LIBFAT_SECTOR_SIZE; |
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nent += sizeof(struct fat_dirent)) { |
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if (!memcmp(dep->name, name, 11)) { |
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if (direntry) { |
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memcpy(direntry->entry, dep, sizeof(*dep)); |
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direntry->sector = s; |
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direntry->offset = nent; |
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} |
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if (read32(&dep->size) == 0) |
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return 0; /* An empty file has no clusters */ |
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else |
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return read16(&dep->clustlo) + |
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(read16(&dep->clusthi) << 16); |
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} |
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if (dep->name[0] == 0) |
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return -2; /* Hit high water mark */ |
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dep++; |
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} |
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s = libfat_nextsector(fs, s); |
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} |
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}
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