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Diffstat (limited to 'tools/gifconv/gifread.c')
-rw-r--r-- | tools/gifconv/gifread.c | 402 |
1 files changed, 0 insertions, 402 deletions
diff --git a/tools/gifconv/gifread.c b/tools/gifconv/gifread.c deleted file mode 100644 index 5f4aba0..0000000 --- a/tools/gifconv/gifread.c +++ /dev/null @@ -1,402 +0,0 @@ -/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * - * 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 */ -} - - - - - |