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/****************************************************************************\
** Title: GIF.H **
** Purpose: GIF Header file **
** Version: 1.0 **
** Date: March 1992 **
** Author: James D. Murray, Anaheim, CA, USA **
** C Compilers: Borland C++ v2.0, Microsoft C v6.00a **
** **
** This file contains the header structures for the GIF image **
** file format. **
** **
** **
** Copyright (C) 1991 by Graphics Software Labs. All rights reserved. **
\****************************************************************************/
#include "hdf.h"
#ifndef GIF_H
#define GIF_H 1
#define MAX_PAL 768
/*#include "datatype.h" Data type definitions */
typedef uint8 BYTE;
typedef uint16 WORD;
typedef char CHAR;
typedef uint8 boolean;
#define false 0;
#define true 1;
/* Set the EndianOrder.
** The GIF Reader file should do this.
** Set EndianOrder = 0 if machine is little endian
** EndianOrder = 1 if machine is big endian.
*/
extern int EndianOrder;
/*
** The GIF header format.
**
** This structure actually contains the header, logical screen
** descriptor, and the global color table for the GIF image.
*/
typedef struct _GifHeader /* Offset Description */
{
BYTE PackedField; /* 0Ah Color Information */
WORD TableSize;
BYTE ImageCount; /* Keep a count of the number of images */
BYTE CommentCount;
BYTE ApplicationCount;
BYTE PlainTextCount;
BYTE HDFPalette[256][3];
BYTE HeaderDump[6]; /* BYTE array to dump header contents */
BYTE LSDDump[7]; /* Logical Screen Descriptor dump */
} GIFHEAD;
/*
** The GIF Image Descriptor.
*/
typedef struct _GifImageDescriptor {
WORD ImageWidth; /* Width of the image in pixels */
WORD ImageHeight; /* Height of the image in pixels */
BYTE PackedField; /* Image and Color Table Data Information */
WORD TableSize;
WORD CodeSize; /* Minimum LZW CodeSize for image data */
BYTE HDFPalette[256][3];
BYTE GIDDump[9]; /* GifImageDescriptor dump */
BYTE *Image; /* Decompressed Raster Image */
BYTE *GIFImage;
} GIFIMAGEDESC;
/*
** GIF 89a Graphic Control Extension Block
*/
typedef struct _GifGraphicControlExtension {
BYTE GCEDump[5]; /* Graphic Control Extension Dump */
} GIFGRAPHICCONTROL;
/*
** GIF 89a Plain Text Extension Block
*/
typedef struct _GifPlainTextExtension {
BYTE PTEDump[15]; /* Plain Text Extension Dump */
BYTE *PlainTextData; /* Plain Text data sub-blocks */
WORD DataSize;
} GIFPLAINTEXT;
/*
** GIF 89a Application Extension Block
*/
typedef struct _GifApplicationExtension {
BYTE AEDump[14]; /* Application Extension Dump */
BYTE *ApplicationData; /* Application data sub-blocks */
WORD DataSize;
} GIFAPPLICATION;
/*
** GIF 89a Comment Extension Block
*/
typedef struct _GifCommentExtension {
BYTE CEDump[2]; /* Comment Extension Dump */
BYTE *CommentData; /* Comment data sub-blocks */
WORD DataSize;
BYTE Terminator; /* Block Terminator (always 0) */
} GIFCOMMENT;
/*
** GIF to HDF Memory Struct
** Purpose : The gif to hdf structure is used to pass all the
** gif data to the memory, which gets caught by the hdf driver
** Its the drivers job to put the data in the appropriate places
** in the HDF file.
** I have assumed that the ImageDescriptors and GraphicControls follow
** one another, ie. I have not associated them with each other. The driver
** must assume a 1-1 correspondence. The same discussion with plain text
** extension.
*/
typedef struct _GifToMem {
GIFHEAD *GifHeader;
GIFIMAGEDESC **GifImageDesc;
GIFGRAPHICCONTROL **GifGraphicControlExtension;
GIFPLAINTEXT **GifPlainTextExtension;
GIFAPPLICATION **GifApplicationExtension;
GIFCOMMENT **GifCommentExtension;
} GIFTOMEM;
/*
** Function Prototypes
*/
/* GIF2MEM.C */
GIFTOMEM Gif2Mem(BYTE *);
/* GIFREAD.C */
int ReadGifHeader(GIFHEAD *, BYTE **);
int ReadGifImageDesc(GIFIMAGEDESC *, BYTE **);
int ReadGifGraphicControl(GIFGRAPHICCONTROL *, BYTE **);
int ReadGifPlainText(GIFPLAINTEXT *, BYTE **);
int ReadGifApplication(GIFAPPLICATION *, BYTE **);
int ReadGifComment(GIFCOMMENT *, BYTE **);
/* WRITEHDF.C */
int WriteHDF(GIFTOMEM, CHAR *, CHAR *);
BYTE *ReadDataSubBlocks(BYTE **, WORD *);
BYTE *Decompress(GIFIMAGEDESC *, GIFHEAD *);
BYTE GetByte(BYTE *);
WORD GetWord(BYTE *);
#endif /* GIF_H */
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