56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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/*
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* isofs.c
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*
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* Copyright (C) 2007 Red Hat, Inc. 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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#define BLOCK_SIZE 2048
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/* returns 1 if file is an ISO, 0 otherwise */
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int fileIsIso(const char * file) {
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int blkNum;
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char magic[5];
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int fd;
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fd = open(file, O_RDONLY);
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if (fd < 0)
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return 0;
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for (blkNum = 16; blkNum < 100; blkNum++) {
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if (lseek(fd, blkNum * BLOCK_SIZE + 1, SEEK_SET) < 0) {
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close(fd);
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return 0;
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}
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if (read(fd, magic, sizeof(magic)) != sizeof(magic)) {
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close(fd);
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return 0;
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}
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if (!strncmp(magic, "CD001", 5)) {
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close(fd);
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return 1;
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}
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}
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close(fd);
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return 0;
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}
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