Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/extra/scanlzma/scanlzma.c

+/*
+    scanlzma, scan for lzma compressed data in stdin and echo it to stdout.
+    Copyright (C) 2006 Timo Lindfors
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+*/
+
+/* Usage example:
+
+   $ wget http://www.wifi-shop.cz/Files/produkty/wa2204/wa2204av1.4.1.zip
+   $ unzip wa2204av1.4.1.zip
+   $ gcc scanlzma.c -o scanlzma -Wall
+   $ ./scanlzma 0 < WA2204-FW1.4.1/linux-1.4.bin | lzma -c -d | strings | grep -i "copyright"
+   UpdateDD version 2.5, Copyright (C) 2005 Philipp Benner.
+   Copyright (C) 2005 Philipp Benner.
+   Copyright (C) 2005 Philipp Benner.
+   mawk 1.3%s%s %s, Copyright (C) Michael D. Brennan
+   # Copyright (C) 1998, 1999, 2001  Henry Spencer.
+   ...
+
+*/
+
+
+/* LZMA compressed file format */
+/* --------------------------- */
+/* Offset Size Description */
+/*   0     1   Special LZMA properties for compressed data */
+/*   1     4   Dictionary size (little endian) */
+/*   5     8   Uncompressed size (little endian). -1 means unknown size */
+/*  13         Compressed data */
+
+#define BUFSIZE 4096
+
+int find_lzma_header(unsigned char *buf) {
+        return (buf[0] < 0xE1
+                && buf[0] == 0x5d
+                && buf[4] < 0x20
+                && (memcmp (buf + 10 , "\x00\x00\x00", 3) == 0
+                    || (memcmp (buf + 5, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8) == 0)));
+}
+
+int main(int argc, char *argv[]) {
+        char buf[BUFSIZE];
+        int ret, i, numlzma, blocks=0;
+
+        if (argc != 2) {
+                printf("usage: %s numlzma < infile | lzma -c -d > outfile\n"
+                       "where numlzma is index of lzma file to extract, starting from zero.\n",
+                       argv[0]);
+                exit(1);
+        }
+        numlzma = atoi(argv[1]);
+
+        for (;;) {
+                /* Read data. */
+                ret = fread(buf, BUFSIZE, 1, stdin);
+                if (ret != 1)
+                        break;
+
+                /* Scan for signature. */
+                for (i = 0; i<BUFSIZE-23; i++) {
+                        if (find_lzma_header(buf+i) && numlzma-- <= 0) {
+                                fwrite(buf+i, (BUFSIZE-i), 1, stdout);
+                                for (;;) {
+                                        int ch;
+                                        ch = getchar();
+                                        if (ch == EOF)
+                                                exit(0);
+                                        putchar(ch);
+                                }
+                        }
+                }
+                blocks++;
+        }
+        return 1;
+}