/***************************************
* SZDDD_OPEN
***************************************
* opens an SZDD file without decompressing, reads header
*/
static struct msszddd_header *szddd_open(struct msszdd_decompressor *self,
char *filename)
{
struct msszdd_decompressor_p *this = (struct msszdd_decompressor_p *) self;
struct msszddd_header_p *szdd = NULL;
struct mspack_system *sys;
struct mspack_file *fh;
int error;
if (!this) return NULL;
sys = this->system;
if ((fh = sys->open(sys, filename, MSPACK_SYS_OPEN_READ))) {
if ((szdd = sys->alloc(sys, sizeof(struct msszddd_header_p)))) {
szdd->fh = fh;
error = szddd_read_headers(sys, fh, (struct msszddd_header *) szdd);
if (error) {
szddd_close(self, (struct msszddd_header *) szdd);
szdd = NULL;
}
this->error = error;
}
else {
this->error = MSPACK_ERR_NOMEMORY;
}
sys->close(fh);
}
else {
this->error = MSPACK_ERR_OPEN;
}
return (struct msszddd_header *) szdd;
}
/***************************************
* SZDDD_DECOMPRESS
***************************************
* unpacks directly from input to output
*/
static int szddd_decompress(struct msszdd_decompressor *base,
const char *input, const char *output)
{
struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
struct msszddd_header *hdr;
int error;
if (!self) return MSPACK_ERR_ARGS;
if (!(hdr = szddd_open(base, input))) return self->error;
error = szddd_extract(base, hdr, output);
szddd_close(base, hdr);
return self->error = error;
}