--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwar/extract.c	Sun Mar 22 06:51:48 2009 +0000
@@ -0,0 +1,125 @@
+/*
+extract.c
+Copyright © 2009 William Astle
+
+This file is part of LWAR.
+
+LWAR 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 3 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.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "lwar.h"
+
+void do_extract(void)
+{
+	FILE *f;
+	char buf[8];
+	long l;
+	int c;
+	char fnbuf[1024];
+	int i;
+	FILE *nf;
+	
+	f = fopen(archive_file, "r");
+	if (!f)
+	{
+		perror("Opening archive file");
+		exit(1);
+	}
+	
+	fread(buf, 1, 6, f);
+	if (memcmp("LWAR1V", buf, 6))
+	{
+		fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
+		exit(1);
+	}
+
+	for (;;)
+	{
+		c = fgetc(f);
+		if (ferror(f))
+		{
+			perror("Reading archive file");
+			exit(1);
+		}
+		if (c == EOF)
+			return;
+		
+		
+		// find the end of the file name
+		if (!c)
+			return;
+		
+		i = 0;
+		while (c)
+		{
+			fnbuf[i++] = c;
+			c = fgetc(f);
+			if (c == EOF || ferror(f))
+			{
+				fprintf(stderr, "Bad archive file\n");
+				exit(1);
+			}
+		}
+		fnbuf[i] = 0;
+		
+		// get length of archive member
+		l = 0;
+		c = fgetc(f);
+		l = c << 24;
+		c = fgetc(f);
+		l |= c << 16;
+		c = fgetc(f);
+		l |= c << 8;
+		c = fgetc(f);
+		l |= c;
+		
+		for (i = 0; i < nfiles; i++)
+		{
+			if (!strcmp(files[i], fnbuf))
+				break;
+		}
+		if (i < nfiles || nfiles == 0)
+		{
+			// extract the file
+			nf = fopen(fnbuf, "w");
+			if (!nf)
+			{
+				fprintf(stderr, "Cannot extract '%s': %s\n", fnbuf, strerror(errno));
+				exit(1);
+			}
+			while (l)
+			{
+				c = fgetc(f);
+				fputc(c, nf);
+				l--;
+			}
+			fclose(nf);
+		}
+		else
+		{
+			// skip the file
+			fseek(f, l, SEEK_CUR);
+		}
+	}
+}