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/*
* Gif extracting routines - derived from libungif
*
* Portions Copyright 2006 Mike McCormack
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* Original copyright notice:
*
* The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*/
/******************************************************************************
* In order to make life a little bit easier when using the GIF file format,
* this library was written, and which does all the dirty work...
*
* Written by Gershon Elber, Jun. 1989
* Hacks by Eric S. Raymond, Sep. 1992
******************************************************************************
* History:
* 14 Jun 89 - Version 1.0 by Gershon Elber.
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names)
* 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to support GIF slurp)
* 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support)
* 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code)
*****************************************************************************/
#ifndef _UNGIF_H_
#define _UNGIF_H_ 1
#define GIF_ERROR 0
#define GIF_OK 1
#ifndef TRUE
#define TRUE 1
#endif /* TRUE */
#ifndef FALSE
#define FALSE 0
#endif /* FALSE */
#ifndef NULL
#define NULL 0
#endif /* NULL */
#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
#define GIF_VERSION_POS 3 /* Version first character in stamp. */
#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
#define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */
typedef int GifBooleanType;
typedef unsigned char GifPixelType;
typedef unsigned char *GifRowType;
typedef unsigned char GifByteType;
typedef unsigned int GifPrefixType;
typedef int GifWord;
typedef struct GifColorType {
GifByteType Red, Green, Blue;
} GifColorType;
typedef struct ColorMapObject {
int ColorCount;
int BitsPerPixel;
GifColorType *Colors;
} ColorMapObject;
typedef struct GifImageDesc {
GifWord Left, Top, Width, Height, /* Current image dimensions. */
Interlace; /* Sequential/Interlaced lines. */
ColorMapObject *ColorMap; /* The local color map */
} GifImageDesc;
typedef struct GifFileType {
GifWord SWidth, SHeight, /* Screen dimensions. */
SColorResolution, /* How many colors can we generate? */
SBackGroundColor; /* I hope you understand this one... */
ColorMapObject *SColorMap; /* NULL if not exists. */
int ImageCount; /* Number of current image */
GifImageDesc Image; /* Block describing current image */
struct SavedImage *SavedImages; /* Use this to accumulate file state */
void *UserData; /* hook to attach user data (TVT) */
void *Private; /* Don't mess with this! */
} GifFileType;
typedef enum {
UNDEFINED_RECORD_TYPE,
SCREEN_DESC_RECORD_TYPE,
IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
EXTENSION_RECORD_TYPE, /* Begin with '!' */
TERMINATE_RECORD_TYPE /* Begin with ';' */
} GifRecordType;
/* func type to read gif data from arbitrary sources (TVT) */
typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
/* GIF89 extension function codes */
#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */
#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
/* public interface to ungif.c */
int DGifSlurp(GifFileType * GifFile);
GifFileType *DGifOpen(void *userPtr, InputFunc readFunc);
int DGifCloseFile(GifFileType * GifFile);
#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
#define D_GIF_ERR_READ_FAILED 102
#define D_GIF_ERR_NOT_GIF_FILE 103
#define D_GIF_ERR_NO_SCRN_DSCR 104
#define D_GIF_ERR_NO_IMAG_DSCR 105
#define D_GIF_ERR_NO_COLOR_MAP 106
#define D_GIF_ERR_WRONG_RECORD 107
#define D_GIF_ERR_DATA_TOO_BIG 108
#define D_GIF_ERR_NOT_ENOUGH_MEM 109
#define D_GIF_ERR_CLOSE_FAILED 110
#define D_GIF_ERR_NOT_READABLE 111
#define D_GIF_ERR_IMAGE_DEFECT 112
#define D_GIF_ERR_EOF_TOO_SOON 113
/******************************************************************************
* Support for the in-core structures allocation (slurp mode).
*****************************************************************************/
/* This is the in-core version of an extension record */
typedef struct {
int ByteCount;
char *Bytes;
int Function; /* Holds the type of the Extension block. */
} ExtensionBlock;
/* This holds an image header, its unpacked raster bits, and extensions */
typedef struct SavedImage {
GifImageDesc ImageDesc;
unsigned char *RasterBits;
int Function; /* DEPRECATED: Use ExtensionBlocks[x].Function instead */
int ExtensionBlockCount;
ExtensionBlock *ExtensionBlocks;
} SavedImage;
#endif /* _UNGIF_H_ */