From 67d2a6cfaefba4da5210ee179cf93252fde0752a Mon Sep 17 00:00:00 2001
From: hackbard <hackbard@sage.physik.uni-augsburg.de>
Date: Mon, 14 Mar 2011 16:33:58 +0100
Subject: [PATCH] added tool to extract elecard efp files

---
 efp_extract.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 efp_extract.c

diff --git a/efp_extract.c b/efp_extract.c
new file mode 100644
index 0000000..7198ef4
--- /dev/null
+++ b/efp_extract.c
@@ -0,0 +1,127 @@
+/*
+ * extract elecard efp files
+ *
+ * author: hackbard@hackdaworld.org
+ *
+ * build: gcc -Wall efp_extract -o efp_extract
+ * usage: ./efp_extract file.efp
+ *        chmod 640 file_??
+ *
+ * based on info from Muart232
+ * http://www.mikrocontroller.net/topic/210759
+ *
+ * elecard:
+ * http://www.elecard.com/forum/index.php?topic=4174.0
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+int getbytes(int fd,char *buf,int len) {
+
+	int cnt,ret;
+
+	cnt=len;
+	while(cnt) {
+		ret=read(fd,buf+len-cnt,cnt);
+		cnt-=ret;
+	}
+
+	return 0;
+}
+
+int hexprint(char *buf,int len) {
+
+	int i;
+
+	for(i=0;i<len;i++)
+		printf("%02x ",*(buf+i));
+	printf("\n");
+
+	return 0;
+
+}
+
+int main(int argc,char **argv) {
+
+	int ret,cnt,i,fd,wfd;
+	char buf[128];
+	int nof;
+	unsigned int index[16],offset[16],len[16],wtf[16];
+	char filename[128];
+	char *map;
+
+	fd=open(argv[1],O_RDONLY);
+	if(fd<=0) {
+		perror("fd open");
+		return fd;
+	}
+
+	lseek(fd,12,SEEK_CUR);
+	// ignore first 12 bytes
+
+	getbytes(fd,buf,4);
+	nof=*((unsigned int *)buf);
+
+	printf("number of files: %d\n",nof);
+
+	lseek(fd,6,SEEK_CUR);
+
+	for(i=0;i<nof;i++) {
+
+		getbytes(fd,buf,4);
+		index[i]=*((unsigned int *)buf);
+
+		getbytes(fd,buf,4);
+		wtf[i]=*((unsigned int *)buf);
+
+		getbytes(fd,buf,4);
+		len[i]=*((unsigned int *)buf);
+
+		getbytes(fd,buf,4);
+		offset[i]=*((unsigned int *)buf);
+
+		lseek(fd,8,SEEK_CUR);
+		// ignore
+
+		printf("file %u:\n",index[i]);
+		printf(" - wtf: %u\n",wtf[i]);
+		printf(" - len: %u\n",len[i]);
+		printf(" - offset: %u\n",offset[i]);
+		printf(" - next estimated offset: %u\n",len[i]+offset[i]);
+
+	}
+
+	printf("mapping file into memory ...\n");
+	map=mmap(0,offset[nof-1]+len[nof-1],PROT_READ,MAP_SHARED,fd,0);
+
+	for(i=0;i<nof;i++) {
+
+		snprintf(filename,128,"file_%02d",index[i]);
+
+		wfd=open(filename,O_WRONLY|O_CREAT);
+		if(wfd<=0) {
+			perror("wfd open");
+			return wfd;
+		}
+
+		cnt=len[i];
+		while(cnt) {
+			ret=write(wfd,map+offset[i]+len[i]-cnt,cnt);
+			cnt-=ret;
+		}
+
+		close(wfd);
+
+	}
+
+	close(fd);
+
+	return 0;
+
+}
-- 
2.20.1