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86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
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/*
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scanlzma, scan for lzma compressed data in stdin and echo it to stdout.
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Copyright (C) 2006 Timo Lindfors
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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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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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/* Usage example:
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$ wget http://www.wifi-shop.cz/Files/produkty/wa2204/wa2204av1.4.1.zip
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$ unzip wa2204av1.4.1.zip
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$ gcc scanlzma.c -o scanlzma -Wall
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$ ./scanlzma 0 < WA2204-FW1.4.1/linux-1.4.bin | lzma -c -d | strings | grep -i "copyright"
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UpdateDD version 2.5, Copyright (C) 2005 Philipp Benner.
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Copyright (C) 2005 Philipp Benner.
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Copyright (C) 2005 Philipp Benner.
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mawk 1.3%s%s %s, Copyright (C) Michael D. Brennan
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# Copyright (C) 1998, 1999, 2001 Henry Spencer.
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...
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*/
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/* LZMA compressed file format */
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/* --------------------------- */
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/* Offset Size Description */
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/* 0 1 Special LZMA properties for compressed data */
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/* 1 4 Dictionary size (little endian) */
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/* 5 8 Uncompressed size (little endian). -1 means unknown size */
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/* 13 Compressed data */
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#define BUFSIZE 4096
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int find_lzma_header(unsigned char *buf) {
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return (buf[0] < 0xE1
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&& buf[0] == 0x5d
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&& buf[4] < 0x20
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&& (memcmp (buf + 10 , "\x00\x00\x00", 3) == 0
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|| (memcmp (buf + 5, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8) == 0)));
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}
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int main(int argc, char *argv[]) {
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char buf[BUFSIZE];
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int ret, i, numlzma, blocks=0;
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if (argc != 2) {
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printf("usage: %s numlzma < infile | lzma -c -d > outfile\n"
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"where numlzma is index of lzma file to extract, starting from zero.\n",
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argv[0]);
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exit(1);
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}
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numlzma = atoi(argv[1]);
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for (;;) {
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/* Read data. */
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ret = fread(buf, BUFSIZE, 1, stdin);
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if (ret != 1)
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break;
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/* Scan for signature. */
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for (i = 0; i<BUFSIZE-23; i++) {
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if (find_lzma_header(buf+i) && numlzma-- <= 0) {
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fwrite(buf+i, (BUFSIZE-i), 1, stdout);
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for (;;) {
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int ch;
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ch = getchar();
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if (ch == EOF)
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exit(0);
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putchar(ch);
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}
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}
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}
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blocks++;
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}
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return 1;
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}
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