/* Image format-dependent operations. */

typedef struct {

	jas_image_t *(*decode)(jas_stream_t *in, char *opts);
	/* Decode image data from a stream. */

	int (*encode)(jas_image_t *image, jas_stream_t *out, char *opts);
	/* Encode image data to a stream. */

	int (*validate)(jas_stream_t *in);
	/* Determine if stream data is in a particular format. */

} jas_image_fmtops_t;

/* Image format information. */

typedef struct {

	int id;
	/* The ID for this format. */

	char *name;
	/* The name by which this format is identified. */

	char *ext;
	/* The file name extension associated with this format. */

	char *desc;
	/* A brief description of the format. */

	jas_image_fmtops_t ops;
	/* The operations for this format. */

} jas_image_fmtinfo_t;

jas_init

/* Initialize the image format table. */
int jas_init()
{
	jas_image_fmtops_t fmtops;
	int fmtid;

	fmtid = 0;

#if !defined(EXCLUDE_MIF_SUPPORT)
	fmtops.decode = mif_decode;
	fmtops.encode = mif_encode;
	fmtops.validate = mif_validate;
	jas_image_addfmt(fmtid, "mif", "mif", "My Image Format (MIF)", &fmtops);
	++fmtid;
#endif

#if !defined(EXCLUDE_PNM_SUPPORT)
	fmtops.decode = pnm_decode;
	fmtops.encode = pnm_encode;
	fmtops.validate = pnm_validate;
	jas_image_addfmt(fmtid, "pnm", "pnm", "Portable Graymap/Pixmap (PNM)",
	  &fmtops);
	jas_image_addfmt(fmtid, "pnm", "pgm", "Portable Graymap/Pixmap (PNM)",
	  &fmtops);
	jas_image_addfmt(fmtid, "pnm", "ppm", "Portable Graymap/Pixmap (PNM)",
	  &fmtops);
	++fmtid;
#endif

#if !defined(EXCLUDE_BMP_SUPPORT)
	fmtops.decode = bmp_decode;
	fmtops.encode = bmp_encode;
	fmtops.validate = bmp_validate;
	jas_image_addfmt(fmtid, "bmp", "bmp", "Microsoft Bitmap (BMP)", &fmtops);
	++fmtid;
#endif

#if !defined(EXCLUDE_RAS_SUPPORT)
	fmtops.decode = ras_decode;
	fmtops.encode = ras_encode;
	fmtops.validate = ras_validate;
	jas_image_addfmt(fmtid, "ras", "ras", "Sun Rasterfile (RAS)", &fmtops);
	++fmtid;
#endif

#if !defined(EXCLUDE_JP2_SUPPORT)
	fmtops.decode = jp2_decode;
	fmtops.encode = jp2_encode;
	fmtops.validate = jp2_validate;
	jas_image_addfmt(fmtid, "jp2", "jp2",
	  "JPEG-2000 JP2 File Format Syntax (ISO/IEC 15444-1)", &fmtops);
	++fmtid;
	fmtops.decode = jpc_decode;
	fmtops.encode = jpc_encode;
	fmtops.validate = jpc_validate;
	jas_image_addfmt(fmtid, "jpc", "jpc",
	  "JPEG-2000 Code Stream Syntax (ISO/IEC 15444-1)", &fmtops);
	++fmtid;
#endif

#if !defined(EXCLUDE_JPG_SUPPORT)
	fmtops.decode = jpg_decode;
	fmtops.encode = jpg_encode;
	fmtops.validate = jpg_validate;
	jas_image_addfmt(fmtid, "jpg", "jpg", "JPEG (ISO/IEC 10918-1)", &fmtops);
	++fmtid;
#endif

#if !defined(EXCLUDE_PGX_SUPPORT)
	fmtops.decode = pgx_decode;
	fmtops.encode = pgx_encode;
	fmtops.validate = pgx_validate;
	jas_image_addfmt(fmtid, "pgx", "pgx", "JPEG-2000 VM Format (PGX)", &fmtops);
	++fmtid;
#endif

	/* We must not register the JasPer library exit handler until after
	at least one memory allocation is performed.  This is desirable
	as it ensures that the JasPer exit handler is called before the
	debug memory allocator exit handler. */
	atexit(jas_cleanup);

	return 0;
}
　　

int jas_image_addfmt(int id, char *name, char *ext, char *desc,
  jas_image_fmtops_t *ops)
{
	jas_image_fmtinfo_t *fmtinfo;
	assert(id >= 0 && name && ext && ops);
	if (jas_image_numfmts >= JAS_IMAGE_MAXFMTS) {
		return -1;
	}
	fmtinfo = &jas_image_fmtinfos[jas_image_numfmts];
	fmtinfo->id = id;
	if (!(fmtinfo->name = jas_strdup(name))) {
		return -1;
	}
	if (!(fmtinfo->ext = jas_strdup(ext))) {
		jas_free(fmtinfo->name);
		return -1;
	}
	if (!(fmtinfo->desc = jas_strdup(desc))) {
		jas_free(fmtinfo->name);
		jas_free(fmtinfo->ext);
		return -1;
	}
	fmtinfo->ops = *ops;
	++jas_image_numfmts;
	return 0;
}

int jas_image_fmtfromname(char *name)
int jas_image_fmtfromname(char *name)
{
	int i;
	char *ext;
	jas_image_fmtinfo_t *fmtinfo;
	/* Get the file name extension. */
	if (!(ext = strrchr(name, '.'))) {
		return -1;
	}
	++ext;
	/* Try to find a format that uses this extension. */	
	for (i = 0, fmtinfo = jas_image_fmtinfos; i < jas_image_numfmts; ++i,
	  ++fmtinfo) {
		/* Do we have a match? */
		if (!strcmp(ext, fmtinfo->ext)) {
			return fmtinfo->id;
		}
	}
	return -1;
}