1 #ifndef _GIF_LIB_PRIVATE_H
2 #define _GIF_LIB_PRIVATE_H
3 
4 #include "gif_lib.h"
5 #include "gif_hash.h"
6 
7 #define PROGRAM_NAME	"GIFLIB"
8 
9 #define LZ_MAX_CODE	4095		/* Biggest code possible in 12 bits. */
10 #define LZ_BITS		12
11 
12 #define FLUSH_OUTPUT		4096    /* Impossible code, to signal flush. */
13 #define FIRST_CODE		4097    /* Impossible code, to signal first. */
14 #define NO_SUCH_CODE		4098    /* Impossible code, to signal empty. */
15 
16 #define FILE_STATE_WRITE    0x01
17 #define FILE_STATE_SCREEN   0x02
18 #define FILE_STATE_IMAGE    0x04
19 #define FILE_STATE_READ     0x08
20 
21 #define IS_READABLE(Private)    (Private->FileState & FILE_STATE_READ)
22 #define IS_WRITEABLE(Private)   (Private->FileState & FILE_STATE_WRITE)
23 
24 
25 typedef struct GifFilePrivateType {
26     int FileState,
27 	FileHandle,			     /* Where all this data goes to! */
28 	BitsPerPixel,	    /* Bits per pixel (Codes uses at least this + 1). */
29 	ClearCode,				       /* The CLEAR LZ code. */
30 	EOFCode,				         /* The EOF LZ code. */
31 	RunningCode,		    /* The next code algorithm can generate. */
32 	RunningBits,/* The number of bits required to represent RunningCode. */
33 	MaxCode1,  /* 1 bigger than max. possible code, in RunningBits bits. */
34 	LastCode,		        /* The code before the current code. */
35 	CrntCode,				  /* Current algorithm code. */
36 	StackPtr,		         /* For character stack (see below). */
37 	CrntShiftState;		        /* Number of bits in CrntShiftDWord. */
38     unsigned long CrntShiftDWord;     /* For bytes decomposition into codes. */
39     unsigned long PixelCount;		       /* Number of pixels in image. */
40     FILE *File;						  /* File as stream. */
41     InputFunc Read;                 /* function to read gif input (TVT) */
42     OutputFunc Write;               /* function to write gif output (MRB) */
43     GifByteType Buf[256];	       /* Compressed input is buffered here. */
44     GifByteType Stack[LZ_MAX_CODE];	 /* Decoded pixels are stacked here. */
45     GifByteType Suffix[LZ_MAX_CODE+1];	       /* So we can trace the codes. */
46     unsigned int Prefix[LZ_MAX_CODE+1];
47     GifHashTableType *HashTable;
48 } GifFilePrivateType;
49 
50 extern int _GifError;
51 
52 
53 #endif /* _GIF_LIB_PRIVATE_H */
54