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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF. The full HDF copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF/releases/. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
** This file contains snippets of code from James Murray's original file
** to display the GIF header information, but most of it has been modified to
** suit gif2hdf
*/
/****************************************************************************\
** Title: GIFHEAD.C **
** Purpose: Display the data in a GIF image file. **
** Version: 1.0 **
** Date: March 1992 **
** Author: James D. Murray, Anaheim, CA, USA **
** C Compilers: Borland C++ v2.0, Microsoft C v6.00a **
** **
** GIFHEAD displays all real information contained within a GIF image **
** file, including all color tables and extension block information. **
** GIFHEAD reads both GIF 87a abd 89a-format files. **
** **
** Copyright (C) 1991-92 by Graphics Software Labs. All rights reserved. **
\****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "gif.h"
#include "hdf.h"
#define GIF_VERSION "1.00"
extern int EndianOrder;
GIFTOMEM
Gif2Mem(BYTE *MemGif)
{
/*
** The gif structure outline for passing data to memory
** is given in gif.h
** These pointers are redundant, should take them out in ver. 2
*/
GIFHEAD *gifHead; /* GIF Header structure */
GIFIMAGEDESC **gifImageDesc; /* Logical Image Descriptor struct */
GIFPLAINTEXT **gifPlainText; /* Plain Text Extension structure */
GIFAPPLICATION **gifApplication; /* Application Extension structure */
GIFCOMMENT **gifComment; /* Comment Extension structure */
GIFGRAPHICCONTROL **gifGraphicControl; /* Graphic Control Extension strct */
GIFTOMEM GifMemoryStruct;
WORD i; /* Loop counter */
BYTE Identifier; /* Extension block identifier holder */
BYTE Label; /* Extension block label holder */
BYTE ImageCount; /* Count of the number of images in the file */
BYTE ImageArray; /* Keep the size of the array to store Images */
BYTE CommentCount;
BYTE CommentArray;
BYTE ApplicationCount;
BYTE ApplicationArray;
BYTE PlainTextCount;
BYTE PlainTextArray;
BYTE GCEflag;
BYTE aTemp;
BYTE j;
BYTE w; /* Two more variables needed only while testing */
BYTE *b; /* Endian Ordering */
/* Allocate memory for the GIF structures */
/* Plug the structs into GifMemoryStruct at the end */
/****************************************************/
if (!(gifHead = (GIFHEAD *)calloc(1, sizeof(GIFHEAD)))) {
printf("Could not allocate memory for gifHead\n");
exit(-1);
}
/*
** The next three have to grow dynamically so we leave them
** for now and let realloc handle it later on.
*/
gifImageDesc = NULL;
gifPlainText = NULL;
gifGraphicControl = NULL;
gifComment = NULL;
gifApplication = NULL;
/******************************/
/* Memory allocation complete */
/* Carry out Endian Testing and set Endian Order */
w = 0x0001;
b = (BYTE *)&w;
EndianOrder = (b[0] ? 1 : 0);
/* Read the GIF image file header information */
ReadGifHeader(gifHead, &MemGif);
/* Check for FILE stream error */
/*
if (ferror(fpGif))
{
fputs("GIFHEAD: Error reading header information!\n", stderr);
exit(-3);
}
*/
/*
** Identify, read, and display block information.
*/
ImageCount = ImageArray = 0;
CommentCount = CommentArray = 0;
ApplicationCount = ApplicationArray = 0;
PlainTextCount = PlainTextArray = 0;
GCEflag = 0;
for (;;) {
Identifier = *MemGif++;
switch (Identifier) {
case 0x3B: /* Trailer */
/* The counts are stored to make it easier while
** putting stuff into the HDF file and then
** deallocating space.
*/
gifHead->ImageCount = ImageCount;
gifHead->CommentCount = CommentCount;
gifHead->ApplicationCount = ApplicationCount;
gifHead->PlainTextCount = PlainTextCount;
/* putting stuff into the gif2mem structure */
GifMemoryStruct.GifHeader = gifHead;
GifMemoryStruct.GifImageDesc = gifImageDesc;
GifMemoryStruct.GifPlainTextExtension = gifPlainText;
GifMemoryStruct.GifApplicationExtension = gifApplication;
GifMemoryStruct.GifCommentExtension = gifComment;
GifMemoryStruct.GifGraphicControlExtension = gifGraphicControl;
/* return the struct */
return GifMemoryStruct;
case 0x2C: /* Image Descriptor */
/* If there was no image descriptor before this increase image count.
** If an imagedescriptor was present, reset GCEflag
*/
if (GCEflag == 0)
ImageCount++;
else
GCEflag = 0;
if (ImageCount > ImageArray) {
aTemp = ImageArray;
ImageArray = (ImageArray << 1) + 1;
if (!(gifImageDesc =
(GIFIMAGEDESC **)realloc(gifImageDesc, sizeof(GIFIMAGEDESC *) * ImageArray))) {
printf("Out of memory!");
exit(-1);
}
if (!(gifGraphicControl = (GIFGRAPHICCONTROL **)realloc(
gifGraphicControl, sizeof(GIFGRAPHICCONTROL *) * ImageArray))) {
printf("Out of memory!");
exit(-1);
}
for (j = aTemp; j < ImageArray; j++) {
gifGraphicControl[j] = NULL;
gifImageDesc[j] = NULL;
}
}
if (!(gifImageDesc[ImageCount - 1] = (GIFIMAGEDESC *)malloc(sizeof(GIFIMAGEDESC)))) {
printf("Out of memory!");
exit(-1);
}
if (ReadGifImageDesc(gifImageDesc[ImageCount - 1], &MemGif) == -1)
fputs("Error reading Image Descriptor information\n", stderr);
/*
** Decompress the Image
*/
gifImageDesc[ImageCount - 1]->Image = Decompress(gifImageDesc[ImageCount - 1], gifHead);
free(gifImageDesc[ImageCount - 1]->GIFImage);
gifImageDesc[ImageCount - 1]->GIFImage = NULL;
/*
** Convert the local palette into an HDF compatible palette
** In case the local color table is present, it is written out as the HDFPalette
** If it is absent the global table is written as the HDFPalette.
*/
if (!((gifImageDesc[ImageCount - 1]->PackedField) & 0x80)) {
/* Check to see if the global color table exists.... */
if (gifHead->PackedField & 0x80) {
for (i = 0; i < gifHead->TableSize; i++) {
gifImageDesc[ImageCount - 1]->HDFPalette[i][0] = gifHead->HDFPalette[i][0];
gifImageDesc[ImageCount - 1]->HDFPalette[i][1] = gifHead->HDFPalette[i][1];
gifImageDesc[ImageCount - 1]->HDFPalette[i][2] = gifHead->HDFPalette[i][2];
}
}
gifImageDesc[ImageCount - 1]->TableSize = gifHead->TableSize;
}
break;
case 0x21: /* Extension Block */
Label = *MemGif++;
switch (Label) {
case 0x01: /* Plain Text Extension */
puts("Plain Text Extension\n");
PlainTextCount++;
if (PlainTextCount > PlainTextArray)
PlainTextArray = (PlainTextArray << 1) + 1;
if (!(gifPlainText = (GIFPLAINTEXT **)realloc(gifPlainText, sizeof(GIFPLAINTEXT *) *
PlainTextArray))) {
printf("Out of memory!");
exit(-1);
}
if (!(gifPlainText[PlainTextCount - 1] =
(GIFPLAINTEXT *)malloc(sizeof(GIFPLAINTEXT)))) {
printf("Out of memory!");
exit(-1);
}
if (ReadGifPlainText(gifPlainText[PlainTextCount - 1], &MemGif))
fprintf(stderr, "Error reading Plain Text Extension information.\n");
break;
case 0xFE: /* Comment Extension */
CommentCount++;
if (CommentCount > CommentArray)
CommentArray = (CommentArray << 1) + 1;
if (!(gifComment =
(GIFCOMMENT **)realloc(gifComment, sizeof(GIFCOMMENT *) * CommentArray))) {
printf("Out of memory!");
exit(-1);
}
if (!(gifComment[CommentCount - 1] = (GIFCOMMENT *)malloc(sizeof(GIFCOMMENT)))) {
printf("Out of memory!");
exit(-1);
}
if (ReadGifComment(gifComment[CommentCount - 1], &MemGif))
fprintf(stderr, "Error reading Comment Extension information\n");
break;
case 0xF9: /* Graphic Control Extension */
if (GCEflag == 0)
ImageCount++;
GCEflag = 1;
if (ImageCount > ImageArray) {
aTemp = ImageArray;
ImageArray = (ImageArray << 1) + 1;
if (!(gifGraphicControl = (GIFGRAPHICCONTROL **)realloc(
gifGraphicControl, sizeof(GIFGRAPHICCONTROL *) * ImageArray))) {
printf("Out of memory!");
exit(-1);
}
if (!(gifImageDesc = (GIFIMAGEDESC **)realloc(
gifImageDesc, sizeof(GIFIMAGEDESC *) * ImageArray))) {
printf("Out of memory!");
exit(-1);
}
for (j = aTemp; j < ImageArray; j++) {
gifGraphicControl[j] = NULL;
gifImageDesc[j] = NULL;
}
}
if (!(gifGraphicControl[ImageCount - 1] =
(GIFGRAPHICCONTROL *)malloc(sizeof(GIFGRAPHICCONTROL)))) {
printf("Out of memory!");
exit(-1);
}
if (ReadGifGraphicControl(gifGraphicControl[ImageCount - 1], &MemGif))
fprintf(stderr, "Error reading Graphic Control Extension information\n");
if (!(*MemGif++ == 0))
fprintf(stderr, "Error reading Graphic Control Extension\n");
break;
case 0xFF: /* Application Extension */
ApplicationCount++;
if (ApplicationCount > ApplicationArray)
ApplicationArray = (ApplicationArray << 1) + 1;
if (!(gifApplication = (GIFAPPLICATION **)realloc(
gifApplication, sizeof(GIFAPPLICATION *) * ApplicationArray))) {
printf("Out of memory!");
exit(-1);
}
if (!(gifApplication[ApplicationCount - 1] =
(GIFAPPLICATION *)malloc(sizeof(GIFAPPLICATION)))) {
printf("Out of memory!");
exit(-1);
}
if (ReadGifApplication(gifApplication[ApplicationCount - 1], &MemGif))
fprintf(stderr, "Error reading Application Extension information\n");
break;
default:
printf("Unknown Extension Label: 0x%02x\n", Label);
break;
}
break;
default:
fprintf(stderr, "Unknown Block Separator Character: 0x%02x\n", Identifier);
}
}
}
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