Add initial version of lar to the archive.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-By: Stefan Reinauer  <stepan@coresystems.de> and others.


git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@39 f3766cd6-281f-0410-b1cd-43a5c92072e9

util/lar/example.c

@@ -0,0 +1,124 @@
+/*
+ *  lar - linuxbios archiver
+ *
+ *  written by Stefan Reinauer <stepan@coresystems.de>
+ *
+ *  (C) 2006 coresystems GmbH. All rights reserved.
+ *
+ *  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; version 2 of the License.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ *
+ *  This file may be dual licensed with the new BSD license.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <netinet/in.h>
+
+#include "lar.h"
+
+struct mem_file {
+	char *start;
+	int len;
+};
+
+int find_file(struct mem_file *archive, char *filename, struct mem_file *result)
+{
+	char * walk, *fullname;
+	struct lar_header * header;
+	
+	for (walk = archive->start; walk < archive->start + 
+			archive->len; walk+=16) {
+
+		if(strcmp(walk, MAGIC)!=0)
+			continue;
+
+		header=(struct lar_header *)walk;
+		fullname=walk+sizeof(struct lar_header);
+
+		// FIXME: check checksum
+		
+		if(strcmp(fullname, filename)!=0) {
+			result->start=walk + ntohl(header->offset);
+			result->len=ntohl(header->len);
+			return 0;
+		}
+
+		// skip file
+		walk += ( ntohl(header->offset) + ntohl(header->len)
+				+ 15 ) & 0xfffffff0;
+	}
+
+	return 1;
+}
+
+
+
+int main(int argc, char *argv[])
+{
+	int fd, ret;
+	struct stat statbuf;
+	struct mem_file archive, result;
+
+	if (argc!=2) {
+		printf("Usage: example archive.lar\n");
+		exit(0);
+	}
+
+	if (stat(argv[1], &statbuf)!=0) {
+		printf("Error opening %s: %s\n", 
+				argv[1], strerror(errno));
+		exit(1);
+	}
+	printf("Opening %s\n", argv[1]);
+
+	fd=open(argv[1], O_RDONLY);
+	if (fd==-1) {
+		printf("Error while opening %s: %s\n", 
+				argv[1], strerror(errno));
+		exit(1);
+	}
+	archive.len=statbuf.st_size;
+
+	archive.start=mmap(NULL, statbuf.st_size, PROT_READ,
+			MAP_SHARED, fd, 0);
+	/* OS stuff ends here */
+	/* ------------------------------------------------- */
+
+	// find first compressor
+	ret=find_file(&archive, "compression/", &result);
+	if(!ret) printf("file found.\n");
+	else printf("file not found.\n");
+
+	ret=find_file(&archive, "normal/initram", &result);
+	if(!ret) printf("file found.\n");
+	else printf("file not found.\n");
+
+
+	/* ------------------------------------------------- */
+	/* OS stuff starts again here */
+	munmap(archive.start, archive.len);
+	close(fd);
+
+	return 0;
+}
+
+