63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/* vi: set sw=4 ts=4: */
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/*
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* busybox gunzip trailing header handler
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* Copyright Glenn McGrath 2002
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "config.h"
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#include "busybox.h"
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#include "unarchive.h"
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extern unsigned int gunzip_crc;
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extern unsigned int gunzip_bytes_out;
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extern unsigned char *gunzip_in_buffer;
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extern unsigned char gunzip_in_buffer_count;
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extern void check_trailer_gzip(int src_fd)
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{
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unsigned int stored_crc = 0;
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unsigned char count;
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/* top up the input buffer with the rest of the trailer */
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xread_all(src_fd, &gunzip_in_buffer[gunzip_in_buffer_count], 8 - gunzip_in_buffer_count);
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for (count = 0; count != 4; count++) {
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stored_crc |= (gunzip_in_buffer[count] << (count * 8));
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}
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/* Validate decompression - crc */
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if (stored_crc != (gunzip_crc ^ 0xffffffffL)) {
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error_msg("invalid compressed data--crc error");
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}
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/* Validate decompression - size */
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if (gunzip_bytes_out !=
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(gunzip_in_buffer[4] | (gunzip_in_buffer[5] << 8) |
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(gunzip_in_buffer[6] << 16) | (gunzip_in_buffer[7] << 24))) {
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error_msg("invalid compressed data--length error");
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}
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}
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