From 5d018dc03549c1ee4958364712fb0c94e1bf2741 Mon Sep 17 00:00:00 2001
From: Lasse Collin <lasse.collin@tukaani.org>
Date: Sun, 9 Dec 2007 00:42:33 +0200
Subject: Imported to git.

---
 extra/scanlzma/scanlzma.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 extra/scanlzma/scanlzma.c

(limited to 'extra/scanlzma/scanlzma.c')

diff --git a/extra/scanlzma/scanlzma.c b/extra/scanlzma/scanlzma.c
new file mode 100644
index 00000000..3612f9df
--- /dev/null
+++ b/extra/scanlzma/scanlzma.c
@@ -0,0 +1,85 @@
+/*
+    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;
+}
-- 
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