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-rw-r--r--tools/gifconv/gifread.c402
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diff --git a/tools/gifconv/gifread.c b/tools/gifconv/gifread.c
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--- a/tools/gifconv/gifread.c
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-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Copyright by the Board of Trustees of the University of Illinois. *
- * All rights reserved. *
- * *
- * This file is part of HDF5. The full HDF5 copyright notice, including *
- * terms governing use, modification, and redistribution, is contained in *
- * the files COPYING and Copyright.html. COPYING can be found at the root *
- * of the source code distribution tree; Copyright.html can be found at the *
- * root level of an installed copy of the electronic HDF5 document set and *
- * is linked from the top-level documents page. It can also be found at *
- * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
- * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "gif.h"
-
-int EndianOrder;
-
-static BYTE *ReadDataSubBlocks(BYTE **MemGif2, WORD *DSize);
-
-WORD
-GetWord(BYTE *MemGif)
-{
- WORD w;
-
- if (EndianOrder == 1) {
- /* LittleEndian */
- w = (WORD) (*MemGif++ & 0xFF);
- w |= (WORD) ((*MemGif++ & 0xFF) << 0x08);
- } else {
- w = (WORD) (*MemGif++ & 0xFF);
- w = ((WORD) (*MemGif++ & 0xFF)) | (w << 0x08);
- }
-
- return w;
-}
-
-BYTE
-GetByte(BYTE *MemGif)
-{
- return *MemGif;
-}
-
-/*
- * Read a GIF image BYTE Header.
- *
- * This function reads the Header, Logical Screen Descriptor, and
- * Global Color Table (if any) from a GIF image file. The information
- * is stored in a GIFHEAD structure.
- *
- * Returns: -1 if a FILE stream error occured during the read,
- * otherwise 0 if no error occured.
- */
-int
-ReadGifHeader(GIFHEAD *GifHead, /* Pointer to GIF header structure */
- BYTE **MemGif2) /* GIF image file input FILE stream */
-{
- WORD i; /* Loop counter */
- WORD tableSize; /* Number of entires in the Global Color Table */
-
- GifHead->TableSize = 0;
- for (i = 0 ; i < 6 ; i++) {
- GifHead->HeaderDump[i] = *(*MemGif2)++;
- }
-
- if (strncmp((const char *)GifHead->HeaderDump , "GIF" , 3)) {
- printf("The file does not appear to be a valid GIF file.\n");
- exit(-1);
- }
-
- for (i = 0 ; i < 7 ; i++) {
- GifHead->LSDDump[i] = *(*MemGif2)++;
- }
-
- GifHead->PackedField = GifHead->LSDDump[4];
-
- /* Check if a Global Color Table is present */
- if (GifHead->PackedField & 0x80) {
- /* Read number of color table entries */
- tableSize = (WORD) (1L << ((GifHead->PackedField & 0x07) + 1));
- GifHead->TableSize = tableSize;
-
- /* Read the Global Color Table */
-
- /*
- * There are some changes made here apart from just reading in the
- * global color table as would seem intuitively obvious. The colors
- * are stored in the bottom part of the palette as opposed to the top
- */
-
- for (i = 0; i < tableSize; i++) {
- GifHead->HDFPalette[i][0] = *(*MemGif2)++;
- GifHead->HDFPalette[i][1] = *(*MemGif2)++;
- GifHead->HDFPalette[i][2] = *(*MemGif2)++;
- }
- }
-
- /* Check for a FILE stream error */
-#if 0
- if (ferror(FpGif))
- return -1;
-#endif /* 0 */
-
- return 0; /* No FILE stream error occured */
-}
-
-
-/*
-** Read a GIF Local Image Descriptor.
-**
-** This function reads the Local Image Descriptor, and Local Color
-** Table (if any) from a GIF image file. The information is stored
-** in a GIFIMAGEDESC structure.
-**
-** Note that the ImageSeparator field value in the GIFIMAGEDESC
-** structure is assigned by the function calling ReadGifImageDesc().
-**
-** Returns: -1 if a FILE stream error occured during the read,
-** otherwise 0 if no error occured.
-*/
-int
-ReadGifImageDesc(
- GIFIMAGEDESC *GifImageDesc, /* Pointer to GIF image descriptor structure */
- BYTE **MemGif2 /* GIF image file input FILE stream */
- )
-{
- WORD i; /* Loop counter */
- WORD tableSize; /* Number of entries in the Local Color Table */
- /* BYTE Interlace; */ /* PackedField & 0x20 gives information on interlacing */
- BYTE *TempPtr;
- int ch , ch1;
-
- GifImageDesc->TableSize = 0;
- for (i = 0 ; i < 9 ; i++) {
- GifImageDesc->GIDDump[i] = *(*MemGif2)++;
- }
-
- /*
- ** Get the relevant fields. I need ImageWidth and Height actively hence I have
- ** taken information from those fields. I intend to keep the GifImageDesc data
- ** structure as it is so that anyone needing the rest of the fields can do so
- ** quickly.
- */
-
- if (EndianOrder == 1) /* LittleEndian */
- {
- GifImageDesc->ImageWidth = (WORD) (GifImageDesc->GIDDump[4] & 0xFF);
- GifImageDesc->ImageWidth |= (WORD) ((GifImageDesc->GIDDump[5] & 0xFF) << 0x08);
-
- GifImageDesc->ImageHeight = (WORD) (GifImageDesc->GIDDump[6] & 0xFF);
- GifImageDesc->ImageHeight |= (WORD) ((GifImageDesc->GIDDump[7] & 0xFF) << 0x08);
-
- }
- else
- {
- GifImageDesc->ImageWidth = (WORD) (GifImageDesc->GIDDump[4] & 0xFF);
- GifImageDesc->ImageWidth = ((WORD) (GifImageDesc->GIDDump[5] & 0xFF)) | (GifImageDesc->ImageWidth << 0x08);
-
- GifImageDesc->ImageHeight = (WORD) (GifImageDesc->GIDDump[6] & 0xFF);
- GifImageDesc->ImageHeight = ((WORD) (GifImageDesc->GIDDump[7] & 0xFF)) | (GifImageDesc->ImageWidth << 0x08);
-
-
- }
-
- GifImageDesc->PackedField = GifImageDesc->GIDDump[8];
-
- /* Interlace = GifImageDesc->PackedField & 0x20; */
-
- /* Check if a Local Color Table is present */
- if (GifImageDesc->PackedField & 0x80)
- {
- /* Read number of color table entries */
- tableSize = (WORD) (1L << ((GifImageDesc->PackedField & 0x07) + 1));
- GifImageDesc->TableSize = tableSize;
- /* Read the Local Color Table */
- for (i = 0; i < tableSize; i++)
- {
- GifImageDesc->HDFPalette[i][0] = *(*MemGif2)++;
- GifImageDesc->HDFPalette[i][1] = *(*MemGif2)++;
- GifImageDesc->HDFPalette[i][2] = *(*MemGif2)++;
- }
- }
-
- /*
- ** Get LZW minimum Code Size
- */
- GifImageDesc->CodeSize = (WORD)*(*MemGif2)++;
-
- /*GifImageDesc->GIFImage = ReadDataSubBlocks(FpGif);*/
- if (!(GifImageDesc->GIFImage = (BYTE *)malloc((GifImageDesc->ImageWidth) * (GifImageDesc->ImageHeight)))) {
- printf("Out of memory");
- exit(-1);
- }
-
-
- TempPtr = GifImageDesc->GIFImage;
- do
- {
- ch = ch1 = (int)*(*MemGif2)++;
- while (ch--) *TempPtr++ = *(*MemGif2)++;
- }
- while (ch1);
-
-
- return(0); /* No FILE stream error occured */
-}
-
-
-/*
-** Read a GIF Graphic Control Extension block.
-**
-** Note that the Introducer and Label field values in the GIFGRAPHICCONTROL
-** structure are assigned by the function calling ReadGifGraphicControl().
-**
-** Returns: -1 if a FILE stream error occured during the read,
-** otherwise 0 if no error occured.
-*/
-int
-ReadGifGraphicControl(
- GIFGRAPHICCONTROL *GifGraphicControl, /* Pointer to GC Extension structure */
- BYTE **MemGif2 /* GIF image file input FILE stream */
- )
-{
- int i;
-
- for (i = 0 ; i < 5 ; i++) {
- GifGraphicControl->GCEDump[i] = *(*MemGif2)++;
- }
-
- return(0); /* No FILE stream error occured */
-}
-
-
-/*
-** Read a GIF Plain Text Extension block.
-**
-** Note that the Introducer and Label field values in the GIFLPLAINTEXT
-** structure are assigned by the function calling ReadGifPlainText().
-**
-** Returns: -1 if a FILE stream error occured during the read,
-** otherwise 0 if no error occured.
-*/
-int
-ReadGifPlainText(
- GIFPLAINTEXT *GifPlainText, /* Pointer to Plain Text Extension structure */
- BYTE **MemGif2 /* GIF image file input FILE stream */
- )
-{
- int i;
-
- for (i = 0 ; i < 13 ; i++) {
- GifPlainText->PTEDump[i] = *(*MemGif2)++;
- }
-
- /* Read in the Plain Text data sub-blocks */
- if (!(GifPlainText->PlainTextData = ReadDataSubBlocks(MemGif2 , &(GifPlainText->DataSize))))
- return(1);
-
- /*
- GifPlainText->Terminator = 0;
- */
-
- /* Check for a FILE stream error */
- /*
- if (ferror(FpGif))
- return(-1);
- */
-
- return(0); /* No FILE stream error occured */
-}
-
-
-/*
-** Read a GIF Application Extension block.
-**
-** Note that the Introducer and Label field values in the GIFAPPLICATION
-** structure are assigned by the function calling ReadGifApplication().
-**
-** Returns: -1 if a FILE stream error occured during the read,
-** otherwise 0 if no error occured.
-*/
-int
-ReadGifApplication(
- GIFAPPLICATION *GifApplication, /* Pointer to Application Extension structure */
- BYTE **MemGif2 /* GIF image file input FILE stream */
- )
-{
- int i;
-
- for (i = 0 ; i < 12 ; i++) {
- GifApplication->AEDump[i] = *(*MemGif2)++;
- }
-
- /* Read in the Plain Text data sub-blocks */
- if (!(GifApplication->ApplicationData = ReadDataSubBlocks(MemGif2 , &(GifApplication->DataSize))))
- return(1);
- /*
- GifApplication->Terminator = 0;
- */
-
- /* Check for a FILE stream error */
- /*
- if (ferror(FpGif))
- return(-1);
- */
-
- return(0); /* No FILE stream error occured */
-}
-
-
-/*
-** Read a GIF Comment Extension block.
-**
-** Note that the Introducer and Label field values in the GIFCOMMENT
-** structure are assigned by the function calling ReadGifComment().
-**
-** Returns: -1 if a FILE stream error occured during the read,
-** otherwise 0 if no error occured.
-*/
-int
-ReadGifComment(
- GIFCOMMENT *GifComment, /* Pointer to GIF Comment Extension structure */
- BYTE **MemGif2 /* GIF image file input FILE stream */
- )
-{
-
- /* Read in the Plain Text data sub-blocks */
- if (!(GifComment->CommentData = ReadDataSubBlocks(MemGif2 , &(GifComment->DataSize))))
- return(1);
-
- GifComment->Terminator = 0;
-
- return(0); /* No FILE stream error occured */
-}
-
-
-/*
-** Read one or more GIF data sub-blocks and write the information
-** to a buffer.
-**
-** A GIF "sub-block" is a single count byte followed by 1 to 255
-** additional data bytes.
-**
-** Returns: A NULL pointer if a memory allocation error occured,
-** otherwise a valid pointer if no error occured.
-*/
-static BYTE *
-ReadDataSubBlocks(BYTE **MemGif2, /* GIF image file input FILE stream */
- WORD *DSize)
-{
- BYTE *ptr1; /* Pointer used to "walk the heap" */
- BYTE *ptr2; /* Pointer used to mark the top of the heap */
- BYTE dataSize; /* Size of the current data sub-block being read */
- WORD bufSize; /* Total size of the Plain Text data buffer */
- int tempcount = 0;
-
- bufSize = 0; /* The output buffer is empty */
-
- dataSize = *(*MemGif2)++; /* Get the size of the first sub-block */
-
- /* Allocate initial data buffer */
- if (!(ptr1 = ptr2 = (BYTE *) malloc((size_t)dataSize + 1))) {
- printf("Out of memory. Allocation of memory for data sub-blocks for\neither Comment, Plain Text or Application Extensions failed");
- return((BYTE *) NULL);
- }
- for (;;)
- {
- tempcount++;
- bufSize += (dataSize); /* Running total of the buffer size */
- *DSize = bufSize;
-
-#ifdef COMMENTED_OUT
- *ptr1++ = dataSize; /* Write the data count */
-#endif /* COMMENTED_OUT */
- while (dataSize--) /* Read/write the Plain Text data */
- *ptr1++ = *(*MemGif2)++;
-
- /* Check if there is another data sub-block */
- if ((dataSize = *(*MemGif2)++) == 0)
- break; /* Block Terminator encountered */
-
- /* Increase the buffer size to accomodate the next sub-block */
- if (!(ptr1 = ptr2 = (BYTE *) realloc(ptr2, bufSize + dataSize + 1)))
- return((BYTE *) NULL);
-
-
- ptr1 += bufSize; /* Move pointer to the end of the data */
-
-
- }
-
- *ptr1++ = '\0';
-
- return(ptr2); /* Return a pointer to the sub-block data */
-}
-
-
-
-
-
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