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64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* ----------------------------------------------------------------------- *
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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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unsigned 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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