--- /dev/null
+/******************************************************************************
+* 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 *
+* and Jareth Hein, Jan. 1998 *
+*******************************************************************************
+* 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 suoport GIF slurp) *
+* 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support) *
+* 19 Jan 98 - Version 3.1 by Jareth Hein (Support for user-defined I/O). *
+******************************************************************************/
+
+#ifndef INCLUDED_gifrlib_h_
+#define INCLUDED_gifrlib_h_
+
+#define GIF_ERROR 0
+#define GIF_OK 1
+
+#ifndef TRUE
+#define TRUE 1
+#define FALSE 0
+#endif
+
+#ifndef NULL
+#define NULL 0
+#endif /* NULL */
+
+#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;
+
+#define VoidPtr void *
+
+typedef struct GifColorType {
+ GifByteType Red, Green, Blue;
+} GifColorType;
+
+typedef struct ColorMapObject
+{
+ int ColorCount;
+ int BitsPerPixel;
+ GifColorType *Colors; /* on malloc(3) heap */
+}
+ColorMapObject;
+
+typedef struct GifImageDesc {
+ int Left, Top, Width, Height, /* Current image dimensions. */
+ Interlace; /* Sequential/Interlaced lines. */
+ ColorMapObject *ColorMap; /* The local color map */
+} GifImageDesc;
+
+/* I/O operations. If you roll your own, they need to be semantically equivilent to
+ fread/fwrite, with an additional paramater to hold data local to your method. */
+typedef size_t (*Gif_rw_func)(GifByteType *buffer, size_t size, VoidPtr method_data);
+/* Finish up stream. Non-zero return indicates failure */
+typedef int (*Gif_close_func)(VoidPtr close_data);
+/* Error handling function */
+typedef void (*Gif_error_func)(const char *string, VoidPtr error_data);
+
+typedef struct GifFileType {
+ int SWidth, SHeight, /* Screen dimensions. */
+ SColorResolution, /* How many colors can we generate? */
+ SBackGroundColor; /* I hope you understand this one... */
+ ColorMapObject *SColorMap; /* NULL if it doesn't exist. */
+ int ImageCount; /* Number of current image */
+ GifImageDesc Image; /* Block describing current image */
+ struct SavedImage *SavedImages; /* Use this to accumulate file state */
+ VoidPtr Private; /* Don't mess with this! */
+ VoidPtr GifIO; /* Contains all information for I/O */
+} 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;
+
+/******************************************************************************
+* 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 */
+
+/******************************************************************************
+* IO related routines. Defined in gif_io.c *
+******************************************************************************/
+GifFileType *GifSetup(void);
+void GifFree(GifFileType *GifFile);
+void GifSetReadFunc (GifFileType *GifFile, Gif_rw_func func, VoidPtr data);
+void GifSetWriteFunc(GifFileType *GifFile, Gif_rw_func func, VoidPtr data);
+void GifSetCloseFunc(GifFileType *GifFile, Gif_close_func func, VoidPtr data);
+
+/******************************************************************************
+* O.K., here are the routines one can access in order to decode GIF file: *
+******************************************************************************/
+
+void DGifOpenFileName(GifFileType *GifFile, const char *GifFileName);
+void DGifOpenFileHandle(GifFileType *GifFile, int GifFileHandle);
+void DGifInitRead(GifFileType *GifFile);
+void DGifSlurp(GifFileType *GifFile);
+void DGifGetScreenDesc(GifFileType *GifFile);
+void DGifGetRecordType(GifFileType *GifFile, GifRecordType *GifType);
+void DGifGetImageDesc(GifFileType *GifFile);
+void DGifGetLine(GifFileType *GifFile, GifPixelType *GifLine, int GifLineLen);
+void DGifGetPixel(GifFileType *GifFile, GifPixelType GifPixel);
+void DGifGetComment(GifFileType *GifFile, char *GifComment);
+void DGifGetExtension(GifFileType *GifFile, int *GifExtCode,
+ GifByteType **GifExtension);
+void DGifGetExtensionNext(GifFileType *GifFile, GifByteType **GifExtension);
+void DGifGetCode(GifFileType *GifFile, int *GifCodeSize,
+ GifByteType **GifCodeBlock);
+void DGifGetCodeNext(GifFileType *GifFile, GifByteType **GifCodeBlock);
+void DGifGetLZCodes(GifFileType *GifFile, int *GifCode);
+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 GIF_ERR_NOT_ENOUGH_MEM 109
+#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
+
+/******************************************************************************
+* O.K., here are the error routines *
+******************************************************************************/
+extern void GifSetErrorFunc(GifFileType *GifFile, Gif_error_func func, VoidPtr data);
+extern void GifSetWarningFunc(GifFileType *GifFile, Gif_error_func func, VoidPtr data);
+extern void GifInternError(GifFileType *GifFile, int errnum);
+extern void GifInternWarning(GifFileType *GifFile, int errnum);
+extern void GifError(GifFileType *GifFile, const char *err_str);
+extern void GifWarning(GifFileType *GifFile, const char *err_str);
+
+/*****************************************************************************
+ *
+ * Everything below this point is new after version 1.2, supporting `slurp
+ * mode' for doing I/O in two big belts with all the image-bashing in core.
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+* Support for the in-core structures allocation (slurp mode). *
+******************************************************************************/
+
+/* This is the in-core version of an extension record */
+typedef struct {
+ int ByteCount;
+ GifByteType *Bytes; /* on malloc(3) heap */
+} ExtensionBlock;
+
+/* This holds an image header, its unpacked raster bits, and extensions */
+typedef struct SavedImage {
+ GifImageDesc ImageDesc;
+
+ GifPixelType *RasterBits; /* on malloc(3) heap */
+
+ int Function;
+ int ExtensionBlockCount;
+ ExtensionBlock *ExtensionBlocks; /* on malloc(3) heap */
+} SavedImage;
+
+extern void ApplyTranslation(SavedImage *Image, GifPixelType Translation[]);
+
+extern void MakeExtension(SavedImage *New, int Function);
+extern int AddExtensionBlock(SavedImage *New, int Length, GifByteType *data);
+extern void FreeExtension(SavedImage *Image);
+
+extern SavedImage *MakeSavedImage(GifFileType *GifFile, SavedImage *CopyFrom);
+extern void FreeSavedImages(GifFileType *GifFile);
+
+/* Common defines used by encode/decode functions */
+
+#define COMMENT_EXT_FUNC_CODE 0xfe /* Extension function code for comment. */
+#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 LZ_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
+#define LZ_BITS 12
+
+#define FILE_STATE_READ 0x01
+#define FILE_STATE_WRITE 0x01
+#define FILE_STATE_SCREEN 0x02
+#define FILE_STATE_IMAGE 0x04
+
+#define FLUSH_OUTPUT 4096 /* Impossible code, to signal flush. */
+#define FIRST_CODE 4097 /* Impossible code, to signal first. */
+#define NO_SUCH_CODE 4098 /* Impossible code, to signal empty. */
+
+#define IS_READABLE(Private) (!(Private->FileState & FILE_STATE_READ))
+#define IS_WRITEABLE(Private) (Private->FileState & FILE_STATE_WRITE)
+
+typedef struct GifFilePrivateType {
+ int FileState,
+ BitsPerPixel, /* Bits per pixel (Codes uses at list this + 1). */
+ ClearCode, /* The CLEAR LZ code. */
+ EOFCode, /* The EOF LZ code. */
+ RunningCode, /* The next code algorithm can generate. */
+ RunningBits,/* The number of bits required to represent RunningCode. */
+ MaxCode1, /* 1 bigger than max. possible code, in RunningBits bits. */
+ LastCode, /* The code before the current code. */
+ CrntCode, /* Current algorithm code. */
+ StackPtr, /* For character stack (see below). */
+ CrntShiftState; /* Number of bits in CrntShiftDWord. */
+ unsigned long CrntShiftDWord; /* For bytes decomposition into codes. */
+ unsigned long PixelCount; /* Number of pixels in image. */
+ GifByteType Buf[256]; /* Compressed input is buffered here. */
+ GifByteType Stack[LZ_MAX_CODE]; /* Decoded pixels are stacked here. */
+ GifByteType Suffix[LZ_MAX_CODE+1]; /* So we can trace the codes. */
+ unsigned int Prefix[LZ_MAX_CODE+1];
+} GifFilePrivateType;
+
+typedef struct GifIODataType {
+ Gif_rw_func ReadFunc, WriteFunc; /* Pointers to the functions that will do the I/O */
+ Gif_close_func CloseFunc;
+ VoidPtr ReadFunc_data; /* data to be passed to the read function */
+ VoidPtr WriteFunc_data; /* data to be passed to the write function */
+ VoidPtr CloseFunc_data; /* data to be passed to the close function */
+ Gif_error_func ErrorFunc; /* MUST NOT RETURN (use lng_jmp or exit)! */
+ Gif_error_func WarningFunc; /* For warning messages (can be ignored) */
+ VoidPtr ErrorFunc_data;
+ VoidPtr WarningFunc_data;
+} GifIODataType;
+
+typedef struct GifStdIODataType {
+ FILE *File;
+ int FileHandle;
+} GifStdIODataType;
+
+/* Install StdIO funcs on FILE into GifFile */
+void GifStdIOInit(GifFileType *GifFile, FILE *file, int filehandle);
+
+/* Error checking reads, writes and closes */
+void GifRead(GifByteType *buf, size_t size, GifFileType *GifFile);
+void GifWrite(GifByteType *buf, size_t size, GifFileType *GifFile);
+int GifClose(GifFileType *GifFile);
+
+/* The default Read and Write functions for files */
+size_t GifStdRead(GifByteType *buf, size_t size, VoidPtr method_data);
+size_t GifStdWrite(GifByteType *buf, size_t size, VoidPtr method_data);
+int GifStdFileClose(VoidPtr method_data);
+
+ColorMapObject *MakeMapObject(int ColorCount, GifColorType *ColorMap);
+void FreeMapObject(ColorMapObject *Object);
+
+#endif /* INCLUDED_gifrlib_h_ */
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