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/* gif.h:
*
* gifin.h
* kirk johnson
* november 1989
* external interface to gifin.c
*
* Copyright 1989 Kirk L. Johnson (see the included file
* "kljcpyrght.h" for complete copyright information)
*/
/*
* gifin return codes
*/
#define GIFIN_SUCCESS 0 /* success */
#define GIFIN_DONE 1 /* no more images */
#define GIFIN_ERR_BAD_SD -1 /* bad screen descriptor */
#define GIFIN_ERR_BAD_SEP -2 /* bad image separator */
#define GIFIN_ERR_BAD_SIG -3 /* bad signature */
#define GIFIN_ERR_EOD -4 /* unexpected end of raster data */
#define GIFIN_ERR_EOF -5 /* unexpected end of input stream */
#define GIFIN_ERR_FAO -6 /* file already open */
#define GIFIN_ERR_IAO -7 /* image already open */
#define GIFIN_ERR_NFO -8 /* no file open */
#define GIFIN_ERR_NIO -9 /* no image open */
/*
* colormap indices
*/
#define GIF_RED 0
#define GIF_GRN 1
#define GIF_BLU 2
/*
* typedef BYTE for convenience
*/
typedef unsigned char BYTE;
static int gifin_open_file();
static int gifin_open_image();
static int gifin_get_pixel();
#if 0
static int gifin_close_image();
#endif
static int gifin_close_file();
static int gifin_load_cmap();
static int gifin_skip_extension();
static int gifin_read_data_block();
static int gifin_push_string();
static int gifin_add_string();
static int gifin_fatal();
/* #defines, typedefs, and such
*/
#define GIF_SIG "GIF87a"
#define GIF_SIG_89 "GIF89a"
#define GIF_SIG_LEN 6 /* GIF signature length */
#define GIF_SD_SIZE 7 /* GIF screen descriptor size */
#define GIF_ID_SIZE 9 /* GIF image descriptor size */
#define GIF_SEPARATOR ',' /* GIF image separator */
#define GIF_EXTENSION '!' /* GIF extension block marker */
#define GIF_TERMINATOR ';' /* GIF terminator */
#define STAB_SIZE 4096 /* string table size */
#define PSTK_SIZE 4096 /* pixel stack size */
#define NULL_CODE -1 /* string table null code */
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