2 * Gif extracting routines - derived from libungif
4 * Portions Copyright 2006 Mike McCormack
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 * Original copyright notice:
24 * The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
26 * Permission is hereby granted, free of charge, to any person obtaining a copy
27 * of this software and associated documentation files (the "Software"), to deal
28 * in the Software without restriction, including without limitation the rights
29 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
30 * copies of the Software, and to permit persons to whom the Software is
31 * furnished to do so, subject to the following conditions:
33 * The above copyright notice and this permission notice shall be included in
34 * all copies or substantial portions of the Software.
37 /******************************************************************************
38 * In order to make life a little bit easier when using the GIF file format,
39 * this library was written, and which does all the dirty work...
41 * Written by Gershon Elber, Jun. 1989
42 * Hacks by Eric S. Raymond, Sep. 1992
43 ******************************************************************************
45 * 14 Jun 89 - Version 1.0 by Gershon Elber.
46 * 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names)
47 * 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to support GIF slurp)
48 * 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support)
49 * 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code)
50 *****************************************************************************/
69 #define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
70 #define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
71 #define GIF_VERSION_POS 3 /* Version first character in stamp. */
72 #define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
73 #define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
75 #define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */
77 typedef int GifBooleanType;
78 typedef unsigned char GifPixelType;
79 typedef unsigned char *GifRowType;
80 typedef unsigned char GifByteType;
81 typedef unsigned int GifPrefixType;
84 typedef struct GifColorType {
85 GifByteType Red, Green, Blue;
88 typedef struct ColorMapObject {
94 typedef struct GifImageDesc {
95 GifWord Left, Top, Width, Height, /* Current image dimensions. */
96 Interlace; /* Sequential/Interlaced lines. */
97 ColorMapObject *ColorMap; /* The local color map */
100 typedef struct GifFileType {
101 GifWord SWidth, SHeight, /* Screen dimensions. */
102 SColorResolution, /* How many colors can we generate? */
103 SBackGroundColor; /* I hope you understand this one... */
104 ColorMapObject *SColorMap; /* NULL if not exists. */
105 int ImageCount; /* Number of current image */
106 GifImageDesc Image; /* Block describing current image */
107 struct SavedImage *SavedImages; /* Use this to accumulate file state */
108 void *UserData; /* hook to attach user data (TVT) */
109 void *Private; /* Don't mess with this! */
113 UNDEFINED_RECORD_TYPE,
114 SCREEN_DESC_RECORD_TYPE,
115 IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
116 EXTENSION_RECORD_TYPE, /* Begin with '!' */
117 TERMINATE_RECORD_TYPE /* Begin with ';' */
120 /* func type to read gif data from arbitrary sources (TVT) */
121 typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
123 /* GIF89 extension function codes */
125 #define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
126 #define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */
127 #define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
128 #define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
130 /* public interface to ungif.c */
131 int DGifSlurp(GifFileType * GifFile);
132 GifFileType *DGifOpen(void *userPtr, InputFunc readFunc);
133 int DGifCloseFile(GifFileType * GifFile);
135 #define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
136 #define D_GIF_ERR_READ_FAILED 102
137 #define D_GIF_ERR_NOT_GIF_FILE 103
138 #define D_GIF_ERR_NO_SCRN_DSCR 104
139 #define D_GIF_ERR_NO_IMAG_DSCR 105
140 #define D_GIF_ERR_NO_COLOR_MAP 106
141 #define D_GIF_ERR_WRONG_RECORD 107
142 #define D_GIF_ERR_DATA_TOO_BIG 108
143 #define D_GIF_ERR_NOT_ENOUGH_MEM 109
144 #define D_GIF_ERR_CLOSE_FAILED 110
145 #define D_GIF_ERR_NOT_READABLE 111
146 #define D_GIF_ERR_IMAGE_DEFECT 112
147 #define D_GIF_ERR_EOF_TOO_SOON 113
149 /******************************************************************************
150 * Support for the in-core structures allocation (slurp mode).
151 *****************************************************************************/
153 /* This is the in-core version of an extension record */
157 int Function; /* Holds the type of the Extension block. */
160 /* This holds an image header, its unpacked raster bits, and extensions */
161 typedef struct SavedImage {
162 GifImageDesc ImageDesc;
163 unsigned char *RasterBits;
164 int Function; /* DEPRECATED: Use ExtensionBlocks[x].Function instead */
165 int ExtensionBlockCount;
166 ExtensionBlock *ExtensionBlocks;
169 #endif /* _UNGIF_H_ */