#include "postgres.h"
#include "fmgr.h"


/* MIMETYPES */
#define IMAGE_UNKNOWN 0x00
#define IMAGE_JPG 0x01
#define IMAGE_PNG 0x02

/* IMAGE datatype */
struct pg_image {
    int32 length;       /* VARLENA header */
    uint8 imgtype;      /* image type (IMAGE_JPG or IMAGE_PNG) */
    int width;          /* image width, in pixels */
    int height;         /* image height, in pixels */
    int datasz;         /* image filesize, in bytes */
    char data[];        /* image data */
};
#define DatumGetImageP(X)       ((struct pg_image *) PG_DETOAST_DATUM(X))
#define ImagePGetDatum(X)       PointerGetDatum(X)
#define PG_GETARG_IMAGE_P(n)    DatumGetImageP(PG_GETARG_DATUM(n))
#define PG_RETURN_IMAGE_P(x)    return ImagePGetDatum(x)
Datum   pg_image_in(PG_FUNCTION_ARGS);
Datum   pg_image_out(PG_FUNCTION_ARGS);
Datum   pg_image_in_text(PG_FUNCTION_ARGS);
Datum   pg_image_out_text(PG_FUNCTION_ARGS);
Datum   pg_image_from_bytea(PG_FUNCTION_ARGS);
Datum   pg_image_width(PG_FUNCTION_ARGS);
Datum   pg_image_height(PG_FUNCTION_ARGS);
Datum   pg_image_filesize(PG_FUNCTION_ARGS);
Datum   pg_image_mimetype(PG_FUNCTION_ARGS);
Datum   pg_image_imagedata(PG_FUNCTION_ARGS);
Datum   pg_image_eq(PG_FUNCTION_ARGS);
Datum   pg_image_ne(PG_FUNCTION_ARGS);
Datum   pg_image_hash(PG_FUNCTION_ARGS);