added tool to extract elecard efp files

diff --git a/efp_extract.c b/efp_extract.c
new file mode 100644 (file)
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;
+
+}