gif_lib_private.h

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#ifndef _GIF_LIB_PRIVATE_H
#define _GIF_LIB_PRIVATE_H

#include "gif_lib.h"
#include "gif_hash.h"

#define PROGRAM_NAME    "GIFLIB"

#define LZ_MAX_CODE     4095            /* Biggest code possible in 12 bits. */
#define LZ_BITS         12

#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 FILE_STATE_WRITE    0x01
#define FILE_STATE_SCREEN   0x02
#define FILE_STATE_IMAGE    0x04
#define FILE_STATE_READ     0x08

#define IS_READABLE(Private)    (Private->FileState & FILE_STATE_READ)
#define IS_WRITEABLE(Private)   (Private->FileState & FILE_STATE_WRITE)


typedef struct GifFilePrivateType {
    int FileState,
        FileHandle,                          /* Where all this data goes to! */
        BitsPerPixel,       /* Bits per pixel (Codes uses at least 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. */
    FILE *File;                                           /* File as stream. */
    InputFunc Read;                 /* function to read gif input (TVT) */
    OutputFunc Write;               /* function to write gif output (MRB) */
    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];
    GifHashTableType *HashTable;
} GifFilePrivateType;

extern int _GifError;


#endif /* _GIF_LIB_PRIVATE_H */

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