dsk_err_t sq_open(COMPRESS_DATA *self)
{
SQ_COMPRESS_DATA *sq_self;
dsk_err_t err;
unsigned short magic;
/* Sanity check: Is this meant for our driver? */
if (self->cd_class != &cc_sq) return DSK_ERR_BADPTR;
sq_self = (SQ_COMPRESS_DATA *)self;
sq_self->sq_truename = NULL;
sq_self->fp_in = NULL;
sq_self->fp_out = NULL;
/* Open the file to decompress */
err = comp_fopen(self, &sq_self->fp_in);
if (err) return DSK_ERR_NOTME;
/* Check for SQ signature */
err = readu(sq_self, &magic);
if (err) /* v1.1.11 Don't leak file handles */
{
fclose(sq_self->fp_in);
return err;
}
if (magic != MAGIC)
{
fclose(sq_self->fp_in);
return DSK_ERR_NOTME;
}
/* OK. This is a Squeezed file. Decompress it. */
rewind(sq_self->fp_in);
err = comp_mktemp(self, &sq_self->fp_out);
if (!err) err = unsqueeze(sq_self);
fclose(sq_self->fp_in);
if (sq_self->fp_out) fclose(sq_self->fp_out);
if (err && sq_self->sq_truename) free(sq_self->sq_truename);
return err;
}
/* See if a file can be decompressed */
static dsk_err_t comp_icreat(COMPRESS_DATA **cd, const char *filename, int nc)
{
COMPRESS_CLASS *cc = classes[nc];
dsk_err_t err;
FILE *fp;
if (!cc) return DSK_ERR_BADPTR;
(*cd) = dsk_malloc(cc->cc_selfsize);
if (!*cd) return DSK_ERR_NOMEM;
memset((*cd), 0, cc->cc_selfsize);
err = comp_construct(*cd, filename);
(*cd)->cd_class = cc;
if (err == DSK_ERR_OK) err = (cc->cc_creat)(*cd);
/* Stake out our claim to the temporary file. */
if (err == DSK_ERR_OK) err = comp_mktemp(*cd, &fp);
if (fp) fclose(fp);
if (err == DSK_ERR_OK) return err;
comp_free (*cd);
*cd = NULL;
return err;
}
