/**
* Decompresses single file if building stand-alone DeRNC tool.
* @param pname Name of the program executable.
* @param iname File name of the compressed input file.
* @param oname File name of the decompressed output.
* @return Returns 0 on success. On error prints a message
* and returns nonzero value.
*/
int main_unpack (char *pname, char *iname, char *oname)
{
FILE *ifp, *ofp;
long plen, ulen;
void *packed, *unpacked;
char buffer[4];
long leeway;
ifp = fopen(iname, "rb");
if (!ifp)
{
ERRORF("%s: %s",iname,strerror(errno));
return 1;
}
//Checking if the file is RNC
fseek (ifp, 0L, SEEK_END);
plen = ftell (ifp);
rewind (ifp);
if (plen < 4) // Can't be an RNC file
{
if (strcmp (iname, oname))
return copy_file (iname, oname);
return 0;
}
fread(buffer, 1, 4, ifp);
if (strncmp(buffer, "RNC", 3) != 0)
{
fclose (ifp);
if (strcmp(iname, oname) != 0)
return copy_file(iname, oname);
return 0;
}
rewind(ifp);
//Reading compressed data, 8 bytes in buffer are for safety
packed = malloc(plen+8);
if (packed==NULL)
{
fclose(ifp);
ERRORF("%s: %s",pname,strerror(errno));
return 1;
}
unsigned long rdlen;
rdlen=fread(packed, 1, plen, ifp);
fclose(ifp);
//Getting unpacked file size & allocating space
ulen = rnc_ulen(packed);
if (ulen < 0)
{
free(packed);
if (ulen == -1) // File wasn't RNC to start with
return 0;
printf("Error: %s\n", rnc_error (ulen));
return 1;
}
//Creating output buffer, 8 bytes are for safety
unpacked = malloc(ulen+8);
if (unpacked == NULL)
{
free(packed);
ERRORF("%s: %s",pname,strerror(errno));
return 1;
}
//Do the decompression
ulen = rnc_unpack (packed, unpacked, RNC_IGNORE_NONE, &leeway);
if (ulen < 0)
{
printf("%s\n", rnc_error(ulen));
return 1;
}
//Write results to a file
ofp = fopen(oname, "wb");
if (!ofp)
{
ERRORF("%s: %s",oname,strerror(errno));
return 1;
}
fwrite (unpacked, 1, ulen, ofp);
fclose (ofp);
free (unpacked);
free (packed);
return 0;
}
int main_unpack (char *pname, char *iname, char *oname)
{
FILE *ifp, *ofp;
long plen, ulen;
void *packed, *unpacked;
char buffer[4];
ifp = fopen(iname, "rb");
if (!ifp) {
perror(iname);
return 1;
}
fseek (ifp, 0L, SEEK_END);
plen = ftell (ifp);
rewind (ifp);
if (plen < 4) /* Can't be an RNC file */
{
if (strcmp (iname, oname))
return copy_file (iname, oname);
return 0;
}
fread (buffer, 1, 4, ifp);
if (strncmp (buffer, "RNC", 3))
{
fclose (ifp);
if (strcmp (iname, oname))
return copy_file (iname, oname);
return 0;
}
rewind (ifp);
packed = malloc(plen);
if (!packed) {
perror(pname);
return 1;
}
fread (packed, 1, plen, ifp);
fclose (ifp);
ulen = rnc_ulen (packed);
if (ulen < 0)
{
free (packed);
if (ulen == -1) /* File wasn't RNC to start with */
return 0;
fprintf(stderr, "%s\n", rnc_error (ulen));
return 1;
}
unpacked = malloc(ulen);
if (!unpacked) {
perror(pname);
return 1;
}
ulen = rnc_unpack (packed, unpacked);
if (ulen < 0) {
fprintf(stderr, "%s\n", rnc_error (ulen));
return 1;
}
ofp = fopen(oname, "wb");
if (!ofp) {
perror(oname);
return 1;
}
fwrite (unpacked, 1, ulen, ofp);
fclose (ofp);
free (unpacked);
free (packed);
return 0;
}