auto import from //depot/cupcake/@135843

1 files changed, 0 insertions, 1098 deletions

diff --git a/dgif_lib.c b/dgif_lib.c
deleted file mode 100644
index 760d053..0000000
--- a/dgif_lib.c
+++ /dev/null
@@ -1,1098 +0,0 @@
-/******************************************************************************
- *   "Gif-Lib" - Yet another gif library.
- *
- * Written by:  Gershon Elber            IBM PC Ver 1.1,    Aug. 1990
- ******************************************************************************
- * The kernel of the GIF Decoding process can be found here.
- ******************************************************************************
- * History:
- * 16 Jun 89 - Version 1.0 by Gershon Elber.
- *  3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names).
- *****************************************************************************/
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <stdlib.h>
-#if defined (__MSDOS__) && !defined(__DJGPP__) && !defined(__GNUC__)
-#include <io.h>
-#include <alloc.h>
-#include <sys\stat.h>
-#else
-#include <sys/types.h>
-#include <sys/stat.h>
-#endif /* __MSDOS__ */
-
-#ifdef HAVE_IO_H
-#include <io.h>
-#endif
-
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif /* HAVE_FCNTL_H */
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif /* HAVE_UNISTD_H */
-#include <stdio.h>
-#include <string.h>
-#include "gif_lib.h"
-#include "gif_lib_private.h"
-
-#define COMMENT_EXT_FUNC_CODE 0xfe  /* Extension function code for
-                                       comment. */
-
-/* avoid extra function call in case we use fread (TVT) */
-#define READ(_gif,_buf,_len)                                     \
-  (((GifFilePrivateType*)_gif->Private)->Read ?                   \
-    ((GifFilePrivateType*)_gif->Private)->Read(_gif,_buf,_len) : \
-    fread(_buf,1,_len,((GifFilePrivateType*)_gif->Private)->File))
-
-static int DGifGetWord(GifFileType *GifFile, GifWord *Word);
-static int DGifSetupDecompress(GifFileType *GifFile);
-static int DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line,
-                              int LineLen);
-static int DGifGetPrefixChar(GifPrefixType *Prefix, int Code, int ClearCode);
-static int DGifDecompressInput(GifFileType *GifFile, int *Code);
-static int DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf,
-                             GifByteType *NextByte);
-#ifndef _GBA_NO_FILEIO
-
-/******************************************************************************
- * Open a new gif file for read, given by its name.
- * Returns GifFileType pointer dynamically allocated which serves as the gif
- * info record. _GifError is cleared if succesfull.
- *****************************************************************************/
-GifFileType *
-DGifOpenFileName(const char *FileName) {
-    int FileHandle;
-    GifFileType *GifFile;
-
-    if ((FileHandle = open(FileName, O_RDONLY
-#if defined(__MSDOS__) || defined(WINDOWS32) || defined(_OPEN_BINARY)
-                           | O_BINARY
-#endif /* __MSDOS__ || _OPEN_BINARY */
-         )) == -1) {
-        _GifError = D_GIF_ERR_OPEN_FAILED;
-        return NULL;
-    }
-
-    GifFile = DGifOpenFileHandle(FileHandle);
-    return GifFile;
-}
-
-/******************************************************************************
- * Update a new gif file, given its file handle.
- * Returns GifFileType pointer dynamically allocated which serves as the gif
- * info record. _GifError is cleared if succesfull.
- *****************************************************************************/
-GifFileType *
-DGifOpenFileHandle(int FileHandle) {
-
-    unsigned char Buf[GIF_STAMP_LEN + 1];
-    GifFileType *GifFile;
-    GifFilePrivateType *Private;
-    FILE *f;
-
-    GifFile = (GifFileType *)malloc(sizeof(GifFileType));
-    if (GifFile == NULL) {
-        _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-        close(FileHandle);
-        return NULL;
-    }
-
-    memset(GifFile, '\0', sizeof(GifFileType));
-
-    Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
-    if (Private == NULL) {
-        _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-        close(FileHandle);
-        free((char *)GifFile);
-        return NULL;
-    }
-#if defined(__MSDOS__) || defined(WINDOWS32) || defined(_OPEN_BINARY)
-    setmode(FileHandle, O_BINARY);    /* Make sure it is in binary mode. */
-#endif /* __MSDOS__ */
-
-    f = fdopen(FileHandle, "rb");    /* Make it into a stream: */
-
-#if defined(__MSDOS__) || defined(WINDOWS32)
-    setvbuf(f, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE);    /* And inc. stream
-                                                          buffer. */
-#endif /* __MSDOS__ */
-
-    GifFile->Private = (VoidPtr)Private;
-    Private->FileHandle = FileHandle;
-    Private->File = f;
-    Private->FileState = FILE_STATE_READ;
-    Private->Read = 0;    /* don't use alternate input method (TVT) */
-    GifFile->UserData = 0;    /* TVT */
-
-    /* Lets see if this is a GIF file: */
-    if (READ(GifFile, Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        fclose(f);
-        free((char *)Private);
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    /* The GIF Version number is ignored at this time. Maybe we should do
-     * something more useful with it.  */
-    Buf[GIF_STAMP_LEN] = 0;
-    if (strncmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) {
-        _GifError = D_GIF_ERR_NOT_GIF_FILE;
-        fclose(f);
-        free((char *)Private);
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
-        fclose(f);
-        free((char *)Private);
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    _GifError = 0;
-
-    return GifFile;
-}
-
-#endif /* _GBA_NO_FILEIO */
-
-/******************************************************************************
- * GifFileType constructor with user supplied input function (TVT)
- *****************************************************************************/
-GifFileType *
-DGifOpen(void *userData,
-         InputFunc readFunc) {
-
-    unsigned char Buf[GIF_STAMP_LEN + 1];
-    GifFileType *GifFile;
-    GifFilePrivateType *Private;
-
-    GifFile = (GifFileType *)malloc(sizeof(GifFileType));
-    if (GifFile == NULL) {
-        _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-        return NULL;
-    }
-
-    memset(GifFile, '\0', sizeof(GifFileType));
-
-    Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
-    if (!Private) {
-        _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    GifFile->Private = (VoidPtr)Private;
-    Private->FileHandle = 0;
-    Private->File = 0;
-    Private->FileState = FILE_STATE_READ;
-
-    Private->Read = readFunc;    /* TVT */
-    GifFile->UserData = userData;    /* TVT */
-
-    /* Lets see if this is a GIF file: */
-    if (READ(GifFile, Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        free((char *)Private);
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    /* The GIF Version number is ignored at this time. Maybe we should do
-     * something more useful with it. */
-    Buf[GIF_STAMP_LEN] = 0;
-    if (strncmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) {
-        _GifError = D_GIF_ERR_NOT_GIF_FILE;
-        free((char *)Private);
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
-        free((char *)Private);
-        free((char *)GifFile);
-        return NULL;
-    }
-
-    _GifError = 0;
-
-    return GifFile;
-}
-
-/******************************************************************************
- * This routine should be called before any other DGif calls. Note that
- * this routine is called automatically from DGif file open routines.
- *****************************************************************************/
-int
-DGifGetScreenDesc(GifFileType * GifFile) {
-
-    int i, BitsPerPixel;
-    GifByteType Buf[3];
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    /* Put the screen descriptor into the file: */
-    if (DGifGetWord(GifFile, &GifFile->SWidth) == GIF_ERROR ||
-        DGifGetWord(GifFile, &GifFile->SHeight) == GIF_ERROR)
-        return GIF_ERROR;
-
-    if (READ(GifFile, Buf, 3) != 3) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-    GifFile->SColorResolution = (((Buf[0] & 0x70) + 1) >> 4) + 1;
-    BitsPerPixel = (Buf[0] & 0x07) + 1;
-    GifFile->SBackGroundColor = Buf[1];
-    if (Buf[0] & 0x80) {    /* Do we have global color map? */
-
-        GifFile->SColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
-        if (GifFile->SColorMap == NULL) {
-            _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-            return GIF_ERROR;
-        }
-
-        /* Get the global color map: */
-        for (i = 0; i < GifFile->SColorMap->ColorCount; i++) {
-            if (READ(GifFile, Buf, 3) != 3) {
-                FreeMapObject(GifFile->SColorMap);
-                GifFile->SColorMap = NULL;
-                _GifError = D_GIF_ERR_READ_FAILED;
-                return GIF_ERROR;
-            }
-            GifFile->SColorMap->Colors[i].Red = Buf[0];
-            GifFile->SColorMap->Colors[i].Green = Buf[1];
-            GifFile->SColorMap->Colors[i].Blue = Buf[2];
-        }
-    } else {
-        GifFile->SColorMap = NULL;
-    }
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * This routine should be called before any attempt to read an image.
- *****************************************************************************/
-int
-DGifGetRecordType(GifFileType * GifFile,
-                  GifRecordType * Type) {
-
-    GifByteType Buf;
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    if (READ(GifFile, &Buf, 1) != 1) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-
-    switch (Buf) {
-      case ',':
-          *Type = IMAGE_DESC_RECORD_TYPE;
-          break;
-      case '!':
-          *Type = EXTENSION_RECORD_TYPE;
-          break;
-      case ';':
-          *Type = TERMINATE_RECORD_TYPE;
-          break;
-      default:
-          *Type = UNDEFINED_RECORD_TYPE;
-          _GifError = D_GIF_ERR_WRONG_RECORD;
-          return GIF_ERROR;
-    }
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * This routine should be called before any attempt to read an image.
- * Note it is assumed the Image desc. header (',') has been read.
- *****************************************************************************/
-int
-DGifGetImageDesc(GifFileType * GifFile) {
-
-    int i, BitsPerPixel;
-    GifByteType Buf[3];
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-    SavedImage *sp;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    if (DGifGetWord(GifFile, &GifFile->Image.Left) == GIF_ERROR ||
-        DGifGetWord(GifFile, &GifFile->Image.Top) == GIF_ERROR ||
-        DGifGetWord(GifFile, &GifFile->Image.Width) == GIF_ERROR ||
-        DGifGetWord(GifFile, &GifFile->Image.Height) == GIF_ERROR)
-        return GIF_ERROR;
-    if (READ(GifFile, Buf, 1) != 1) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-    BitsPerPixel = (Buf[0] & 0x07) + 1;
-    GifFile->Image.Interlace = (Buf[0] & 0x40);
-    if (Buf[0] & 0x80) {    /* Does this image have local color map? */
-
-        /*** FIXME: Why do we check both of these in order to do this? 
-         * Why do we have both Image and SavedImages? */
-        if (GifFile->Image.ColorMap && GifFile->SavedImages == NULL)
-            FreeMapObject(GifFile->Image.ColorMap);
-
-        GifFile->Image.ColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
-        if (GifFile->Image.ColorMap == NULL) {
-            _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-            return GIF_ERROR;
-        }
-
-        /* Get the image local color map: */
-        for (i = 0; i < GifFile->Image.ColorMap->ColorCount; i++) {
-            if (READ(GifFile, Buf, 3) != 3) {
-                FreeMapObject(GifFile->Image.ColorMap);
-                _GifError = D_GIF_ERR_READ_FAILED;
-                GifFile->Image.ColorMap = NULL;
-                return GIF_ERROR;
-            }
-            GifFile->Image.ColorMap->Colors[i].Red = Buf[0];
-            GifFile->Image.ColorMap->Colors[i].Green = Buf[1];
-            GifFile->Image.ColorMap->Colors[i].Blue = Buf[2];
-        }
-    } else if (GifFile->Image.ColorMap) {
-        FreeMapObject(GifFile->Image.ColorMap);
-        GifFile->Image.ColorMap = NULL;
-    }
-
-    if (GifFile->SavedImages) {
-        if ((GifFile->SavedImages = (SavedImage *)realloc(GifFile->SavedImages,
-                                      sizeof(SavedImage) *
-                                      (GifFile->ImageCount + 1))) == NULL) {
-            _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-            return GIF_ERROR;
-        }
-    } else {
-        if ((GifFile->SavedImages =
-             (SavedImage *) malloc(sizeof(SavedImage))) == NULL) {
-            _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-            return GIF_ERROR;
-        }
-    }
-
-    sp = &GifFile->SavedImages[GifFile->ImageCount];
-    memcpy(&sp->ImageDesc, &GifFile->Image, sizeof(GifImageDesc));
-    if (GifFile->Image.ColorMap != NULL) {
-        sp->ImageDesc.ColorMap = MakeMapObject(
-                                 GifFile->Image.ColorMap->ColorCount,
-                                 GifFile->Image.ColorMap->Colors);
-        if (sp->ImageDesc.ColorMap == NULL) {
-            _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
-            return GIF_ERROR;
-        }
-    }
-    sp->RasterBits = (unsigned char *)NULL;
-    sp->ExtensionBlockCount = 0;
-    sp->ExtensionBlocks = (ExtensionBlock *) NULL;
-
-    GifFile->ImageCount++;
-
-    Private->PixelCount = (long)GifFile->Image.Width *
-       (long)GifFile->Image.Height;
-
-    DGifSetupDecompress(GifFile);  /* Reset decompress algorithm parameters. */
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * Get one full scanned line (Line) of length LineLen from GIF file.
- *****************************************************************************/
-int
-DGifGetLine(GifFileType * GifFile,
-            GifPixelType * Line,
-            int LineLen) {
-
-    GifByteType *Dummy;
-    GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    if (!LineLen)
-        LineLen = GifFile->Image.Width;
-
-#if defined(__MSDOS__) || defined(WINDOWS32) || defined(__GNUC__)
-    if ((Private->PixelCount -= LineLen) > 0xffff0000UL) {
-#else
-    if ((Private->PixelCount -= LineLen) > 0xffff0000) {
-#endif /* __MSDOS__ */
-        _GifError = D_GIF_ERR_DATA_TOO_BIG;
-        return GIF_ERROR;
-    }
-
-    if (DGifDecompressLine(GifFile, Line, LineLen) == GIF_OK) {
-        if (Private->PixelCount == 0) {
-            /* We probably would not be called any more, so lets clean
-             * everything before we return: need to flush out all rest of
-             * image until empty block (size 0) detected. We use GetCodeNext. */
-            do
-                if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
-                    return GIF_ERROR;
-            while (Dummy != NULL) ;
-        }
-        return GIF_OK;
-    } else
-        return GIF_ERROR;
-}
-
-/******************************************************************************
- * Put one pixel (Pixel) into GIF file.
- *****************************************************************************/
-int
-DGifGetPixel(GifFileType * GifFile,
-             GifPixelType Pixel) {
-    
-    GifByteType *Dummy;
-    GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-#if defined(__MSDOS__) || defined(WINDOWS32) || defined(__GNUC__)
-    if (--Private->PixelCount > 0xffff0000UL)
-#else
-    if (--Private->PixelCount > 0xffff0000)
-#endif /* __MSDOS__ */
-    {
-        _GifError = D_GIF_ERR_DATA_TOO_BIG;
-        return GIF_ERROR;
-    }
-
-    if (DGifDecompressLine(GifFile, &Pixel, 1) == GIF_OK) {
-        if (Private->PixelCount == 0) {
-            /* We probably would not be called any more, so lets clean
-             * everything before we return: need to flush out all rest of
-             * image until empty block (size 0) detected. We use GetCodeNext. */
-            do
-                if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
-                    return GIF_ERROR;
-            while (Dummy != NULL) ;
-        }
-        return GIF_OK;
-    } else
-        return GIF_ERROR;
-}
-
-/******************************************************************************
- * Get an extension block (see GIF manual) from gif file. This routine only
- * returns the first data block, and DGifGetExtensionNext should be called
- * after this one until NULL extension is returned.
- * The Extension should NOT be freed by the user (not dynamically allocated).
- * Note it is assumed the Extension desc. header ('!') has been read.
- *****************************************************************************/
-int
-DGifGetExtension(GifFileType * GifFile,
-                 int *ExtCode,
-                 GifByteType ** Extension) {
-
-    GifByteType Buf;
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    if (READ(GifFile, &Buf, 1) != 1) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-    *ExtCode = Buf;
-
-    return DGifGetExtensionNext(GifFile, Extension);
-}
-
-/******************************************************************************
- * Get a following extension block (see GIF manual) from gif file. This
- * routine should be called until NULL Extension is returned.
- * The Extension should NOT be freed by the user (not dynamically allocated).
- *****************************************************************************/
-int
-DGifGetExtensionNext(GifFileType * GifFile,
-                     GifByteType ** Extension) {
-    
-    GifByteType Buf;
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (READ(GifFile, &Buf, 1) != 1) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-    if (Buf > 0) {
-        *Extension = Private->Buf;    /* Use private unused buffer. */
-        (*Extension)[0] = Buf;  /* Pascal strings notation (pos. 0 is len.). */
-        if (READ(GifFile, &((*Extension)[1]), Buf) != Buf) {
-            _GifError = D_GIF_ERR_READ_FAILED;
-            return GIF_ERROR;
-        }
-    } else
-        *Extension = NULL;
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * This routine should be called last, to close the GIF file.
- *****************************************************************************/
-int
-DGifCloseFile(GifFileType * GifFile) {
-    
-    GifFilePrivateType *Private;
-    FILE *File;
-
-    if (GifFile == NULL)
-        return GIF_ERROR;
-
-    Private = (GifFilePrivateType *) GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    File = Private->File;
-
-    if (GifFile->Image.ColorMap) {
-        FreeMapObject(GifFile->Image.ColorMap);
-        GifFile->Image.ColorMap = NULL;
-    }
-
-    if (GifFile->SColorMap) {
-        FreeMapObject(GifFile->SColorMap);
-        GifFile->SColorMap = NULL;
-    }
-
-    if (Private) {
-        free((char *)Private);
-        Private = NULL;
-    }
-
-    if (GifFile->SavedImages) {
-        FreeSavedImages(GifFile);
-        GifFile->SavedImages = NULL;
-    }
-
-    free(GifFile);
-
-    if (File && (fclose(File) != 0)) {
-        _GifError = D_GIF_ERR_CLOSE_FAILED;
-        return GIF_ERROR;
-    }
-    return GIF_OK;
-}
-
-/******************************************************************************
- * Get 2 bytes (word) from the given file:
- *****************************************************************************/
-static int
-DGifGetWord(GifFileType * GifFile,
-            GifWord *Word) {
-
-    unsigned char c[2];
-
-    if (READ(GifFile, c, 2) != 2) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-
-    *Word = (((unsigned int)c[1]) << 8) + c[0];
-    return GIF_OK;
-}
-
-/******************************************************************************
- * Get the image code in compressed form.  This routine can be called if the
- * information needed to be piped out as is. Obviously this is much faster
- * than decoding and encoding again. This routine should be followed by calls
- * to DGifGetCodeNext, until NULL block is returned.
- * The block should NOT be freed by the user (not dynamically allocated).
- *****************************************************************************/
-int
-DGifGetCode(GifFileType * GifFile,
-            int *CodeSize,
-            GifByteType ** CodeBlock) {
-
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    *CodeSize = Private->BitsPerPixel;
-
-    return DGifGetCodeNext(GifFile, CodeBlock);
-}
-
-/******************************************************************************
- * Continue to get the image code in compressed form. This routine should be
- * called until NULL block is returned.
- * The block should NOT be freed by the user (not dynamically allocated).
- *****************************************************************************/
-int
-DGifGetCodeNext(GifFileType * GifFile,
-                GifByteType ** CodeBlock) {
-
-    GifByteType Buf;
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (READ(GifFile, &Buf, 1) != 1) {
-        _GifError = D_GIF_ERR_READ_FAILED;
-        return GIF_ERROR;
-    }
-
-    if (Buf > 0) {
-        *CodeBlock = Private->Buf;    /* Use private unused buffer. */
-        (*CodeBlock)[0] = Buf;  /* Pascal strings notation (pos. 0 is len.). */
-        if (READ(GifFile, &((*CodeBlock)[1]), Buf) != Buf) {
-            _GifError = D_GIF_ERR_READ_FAILED;
-            return GIF_ERROR;
-        }
-    } else {
-        *CodeBlock = NULL;
-        Private->Buf[0] = 0;    /* Make sure the buffer is empty! */
-        Private->PixelCount = 0;    /* And local info. indicate image read. */
-    }
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * Setup the LZ decompression for this image:
- *****************************************************************************/
-static int
-DGifSetupDecompress(GifFileType * GifFile) {
-
-    int i, BitsPerPixel;
-    GifByteType CodeSize;
-    GifPrefixType *Prefix;
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    READ(GifFile, &CodeSize, 1);    /* Read Code size from file. */
-    BitsPerPixel = CodeSize;
-
-    Private->Buf[0] = 0;    /* Input Buffer empty. */
-    Private->BitsPerPixel = BitsPerPixel;
-    Private->ClearCode = (1 << BitsPerPixel);
-    Private->EOFCode = Private->ClearCode + 1;
-    Private->RunningCode = Private->EOFCode + 1;
-    Private->RunningBits = BitsPerPixel + 1;    /* Number of bits per code. */
-    Private->MaxCode1 = 1 << Private->RunningBits;    /* Max. code + 1. */
-    Private->StackPtr = 0;    /* No pixels on the pixel stack. */
-    Private->LastCode = NO_SUCH_CODE;
-    Private->CrntShiftState = 0;    /* No information in CrntShiftDWord. */
-    Private->CrntShiftDWord = 0;
-
-    Prefix = Private->Prefix;
-    for (i = 0; i <= LZ_MAX_CODE; i++)
-        Prefix[i] = NO_SUCH_CODE;
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * The LZ decompression routine:
- * This version decompress the given gif file into Line of length LineLen.
- * This routine can be called few times (one per scan line, for example), in
- * order the complete the whole image.
- *****************************************************************************/
-static int
-DGifDecompressLine(GifFileType * GifFile,
-                   GifPixelType * Line,
-                   int LineLen) {
-
-    int i = 0;
-    int j, CrntCode, EOFCode, ClearCode, CrntPrefix, LastCode, StackPtr;
-    GifByteType *Stack, *Suffix;
-    GifPrefixType *Prefix;
-    GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
-
-    StackPtr = Private->StackPtr;
-    Prefix = Private->Prefix;
-    Suffix = Private->Suffix;
-    Stack = Private->Stack;
-    EOFCode = Private->EOFCode;
-    ClearCode = Private->ClearCode;
-    LastCode = Private->LastCode;
-
-    if (StackPtr > LZ_MAX_CODE) {
-        return GIF_ERROR;
-    }
-
-    if (StackPtr != 0) {
-        /* Let pop the stack off before continueing to read the gif file: */
-        while (StackPtr != 0 && i < LineLen)
-            Line[i++] = Stack[--StackPtr];
-    }
-
-    while (i < LineLen) {    /* Decode LineLen items. */
-        if (DGifDecompressInput(GifFile, &CrntCode) == GIF_ERROR)
-            return GIF_ERROR;
-
-        if (CrntCode == EOFCode) {
-            /* Note however that usually we will not be here as we will stop
-             * decoding as soon as we got all the pixel, or EOF code will
-             * not be read at all, and DGifGetLine/Pixel clean everything.  */
-            if (i != LineLen - 1 || Private->PixelCount != 0) {
-                _GifError = D_GIF_ERR_EOF_TOO_SOON;
-                return GIF_ERROR;
-            }
-            i++;
-        } else if (CrntCode == ClearCode) {
-            /* We need to start over again: */
-            for (j = 0; j <= LZ_MAX_CODE; j++)
-                Prefix[j] = NO_SUCH_CODE;
-            Private->RunningCode = Private->EOFCode + 1;
-            Private->RunningBits = Private->BitsPerPixel + 1;
-            Private->MaxCode1 = 1 << Private->RunningBits;
-            LastCode = Private->LastCode = NO_SUCH_CODE;
-        } else {
-            /* Its regular code - if in pixel range simply add it to output
-             * stream, otherwise trace to codes linked list until the prefix
-             * is in pixel range: */
-            if (CrntCode < ClearCode) {
-                /* This is simple - its pixel scalar, so add it to output: */
-                Line[i++] = CrntCode;
-            } else {
-                /* Its a code to needed to be traced: trace the linked list
-                 * until the prefix is a pixel, while pushing the suffix
-                 * pixels on our stack. If we done, pop the stack in reverse
-                 * (thats what stack is good for!) order to output.  */
-                if (Prefix[CrntCode] == NO_SUCH_CODE) {
-                    /* Only allowed if CrntCode is exactly the running code:
-                     * In that case CrntCode = XXXCode, CrntCode or the
-                     * prefix code is last code and the suffix char is
-                     * exactly the prefix of last code! */
-                    if (CrntCode == Private->RunningCode - 2) {
-                        CrntPrefix = LastCode;
-                        Suffix[Private->RunningCode - 2] =
-                           Stack[StackPtr++] = DGifGetPrefixChar(Prefix,
-                                                                 LastCode,
-                                                                 ClearCode);
-                    } else {
-                        _GifError = D_GIF_ERR_IMAGE_DEFECT;
-                        return GIF_ERROR;
-                    }
-                } else
-                    CrntPrefix = CrntCode;
-
-                /* Now (if image is O.K.) we should not get an NO_SUCH_CODE
-                 * During the trace. As we might loop forever, in case of
-                 * defective image, we count the number of loops we trace
-                 * and stop if we got LZ_MAX_CODE. obviously we can not
-                 * loop more than that.  */
-                j = 0;
-                while (j++ <= LZ_MAX_CODE &&
-                       CrntPrefix > ClearCode && CrntPrefix <= LZ_MAX_CODE) {
-                    Stack[StackPtr++] = Suffix[CrntPrefix];
-                    CrntPrefix = Prefix[CrntPrefix];
-                }
-                if (j >= LZ_MAX_CODE || CrntPrefix > LZ_MAX_CODE) {
-                    _GifError = D_GIF_ERR_IMAGE_DEFECT;
-                    return GIF_ERROR;
-                }
-                /* Push the last character on stack: */
-                Stack[StackPtr++] = CrntPrefix;
-
-                /* Now lets pop all the stack into output: */
-                while (StackPtr != 0 && i < LineLen)
-                    Line[i++] = Stack[--StackPtr];
-            }
-            if (LastCode != NO_SUCH_CODE) {
-                Prefix[Private->RunningCode - 2] = LastCode;
-
-                if (CrntCode == Private->RunningCode - 2) {
-                    /* Only allowed if CrntCode is exactly the running code:
-                     * In that case CrntCode = XXXCode, CrntCode or the
-                     * prefix code is last code and the suffix char is
-                     * exactly the prefix of last code! */
-                    Suffix[Private->RunningCode - 2] =
-                       DGifGetPrefixChar(Prefix, LastCode, ClearCode);
-                } else {
-                    Suffix[Private->RunningCode - 2] =
-                       DGifGetPrefixChar(Prefix, CrntCode, ClearCode);
-                }
-            }
-            LastCode = CrntCode;
-        }
-    }
-
-    Private->LastCode = LastCode;
-    Private->StackPtr = StackPtr;
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * Routine to trace the Prefixes linked list until we get a prefix which is
- * not code, but a pixel value (less than ClearCode). Returns that pixel value.
- * If image is defective, we might loop here forever, so we limit the loops to
- * the maximum possible if image O.k. - LZ_MAX_CODE times.
- *****************************************************************************/
-static int
-DGifGetPrefixChar(GifPrefixType *Prefix,
-                  int Code,
-                  int ClearCode) {
-
-    int i = 0;
-
-    while (Code > ClearCode && i++ <= LZ_MAX_CODE) {
-        if (Code > LZ_MAX_CODE) {
-            return NO_SUCH_CODE;
-        }
-        Code = Prefix[Code];
-    }
-    return Code;
-}
-
-/******************************************************************************
- * Interface for accessing the LZ codes directly. Set Code to the real code
- * (12bits), or to -1 if EOF code is returned.
- *****************************************************************************/
-int
-DGifGetLZCodes(GifFileType * GifFile,
-               int *Code) {
-    
-    GifByteType *CodeBlock;
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    if (!IS_READABLE(Private)) {
-        /* This file was NOT open for reading: */
-        _GifError = D_GIF_ERR_NOT_READABLE;
-        return GIF_ERROR;
-    }
-
-    if (DGifDecompressInput(GifFile, Code) == GIF_ERROR)
-        return GIF_ERROR;
-
-    if (*Code == Private->EOFCode) {
-        /* Skip rest of codes (hopefully only NULL terminating block): */
-        do {
-            if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR)
-                return GIF_ERROR;
-        } while (CodeBlock != NULL) ;
-
-        *Code = -1;
-    } else if (*Code == Private->ClearCode) {
-        /* We need to start over again: */
-        Private->RunningCode = Private->EOFCode + 1;
-        Private->RunningBits = Private->BitsPerPixel + 1;
-        Private->MaxCode1 = 1 << Private->RunningBits;
-    }
-
-    return GIF_OK;
-}
-
-/******************************************************************************
- * The LZ decompression input routine:
- * This routine is responsable for the decompression of the bit stream from
- * 8 bits (bytes) packets, into the real codes.
- * Returns GIF_OK if read succesfully.
- *****************************************************************************/
-static int
-DGifDecompressInput(GifFileType * GifFile,
-                    int *Code) {
-    
-    GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
-
-    GifByteType NextByte;
-    static unsigned short CodeMasks[] = {
-        0x0000, 0x0001, 0x0003, 0x0007,
-        0x000f, 0x001f, 0x003f, 0x007f,
-        0x00ff, 0x01ff, 0x03ff, 0x07ff,
-        0x0fff
-    };
-    /* The image can't contain more than LZ_BITS per code. */
-    if (Private->RunningBits > LZ_BITS) {
-        _GifError = D_GIF_ERR_IMAGE_DEFECT;
-        return GIF_ERROR;
-    }
-    
-    while (Private->CrntShiftState < Private->RunningBits) {
-        /* Needs to get more bytes from input stream for next code: */
-        if (DGifBufferedInput(GifFile, Private->Buf, &NextByte) == GIF_ERROR) {
-            return GIF_ERROR;
-        }
-        Private->CrntShiftDWord |=
-           ((unsigned long)NextByte) << Private->CrntShiftState;
-        Private->CrntShiftState += 8;
-    }
-    *Code = Private->CrntShiftDWord & CodeMasks[Private->RunningBits];
-
-    Private->CrntShiftDWord >>= Private->RunningBits;
-    Private->CrntShiftState -= Private->RunningBits;
-
-    /* If code cannot fit into RunningBits bits, must raise its size. Note
-     * however that codes above 4095 are used for special signaling.
-     * If we're using LZ_BITS bits already and we're at the max code, just
-     * keep using the table as it is, don't increment Private->RunningCode.
-     */
-    if (Private->RunningCode < LZ_MAX_CODE + 2 &&
-            ++Private->RunningCode > Private->MaxCode1 &&
-            Private->RunningBits < LZ_BITS) {
-        Private->MaxCode1 <<= 1;
-        Private->RunningBits++;
-    }
-    return GIF_OK;
-}
-
-/******************************************************************************
- * This routines read one gif data block at a time and buffers it internally
- * so that the decompression routine could access it.
- * The routine returns the next byte from its internal buffer (or read next
- * block in if buffer empty) and returns GIF_OK if succesful.
- *****************************************************************************/
-static int
-DGifBufferedInput(GifFileType * GifFile,
-                  GifByteType * Buf,
-                  GifByteType * NextByte) {
-
-    if (Buf[0] == 0) {
-        /* Needs to read the next buffer - this one is empty: */
-        if (READ(GifFile, Buf, 1) != 1) {
-            _GifError = D_GIF_ERR_READ_FAILED;
-            return GIF_ERROR;
-        }
-        /* There shouldn't be any empty data blocks here as the LZW spec
-         * says the LZW termination code should come first.  Therefore we
-         * shouldn't be inside this routine at that point.
-         */
-        if (Buf[0] == 0) {
-            _GifError = D_GIF_ERR_IMAGE_DEFECT;
-            return GIF_ERROR;
-        }
-        if (READ(GifFile, &Buf[1], Buf[0]) != Buf[0]) {
-            _GifError = D_GIF_ERR_READ_FAILED;
-            return GIF_ERROR;
-        }
-        *NextByte = Buf[1];
-        Buf[1] = 2;    /* We use now the second place as last char read! */
-        Buf[0]--;
-    } else {
-        *NextByte = Buf[Buf[1]++];
-        Buf[0]--;
-    }
-
-    return GIF_OK;
-}
-#ifndef _GBA_NO_FILEIO
-
-/******************************************************************************
- * This routine reads an entire GIF into core, hanging all its state info off
- * the GifFileType pointer.  Call DGifOpenFileName() or DGifOpenFileHandle()
- * first to initialize I/O.  Its inverse is EGifSpew().
- ******************************************************************************/
-int
-DGifSlurp(GifFileType * GifFile) {
-
-    int ImageSize;
-    GifRecordType RecordType;
-    SavedImage *sp;
-    GifByteType *ExtData;
-    SavedImage temp_save;
-
-    temp_save.ExtensionBlocks = NULL;
-    temp_save.ExtensionBlockCount = 0;
-
-    do {
-        if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR)
-            return (GIF_ERROR);
-
-        switch (RecordType) {
-          case IMAGE_DESC_RECORD_TYPE:
-              if (DGifGetImageDesc(GifFile) == GIF_ERROR)
-                  return (GIF_ERROR);
-
-              sp = &GifFile->SavedImages[GifFile->ImageCount - 1];
-              ImageSize = sp->ImageDesc.Width * sp->ImageDesc.Height;
-
-              sp->RasterBits = (unsigned char *)malloc(ImageSize *
-                                                       sizeof(GifPixelType));
-              if (sp->RasterBits == NULL) {
-                  return GIF_ERROR;
-              }
-              if (DGifGetLine(GifFile, sp->RasterBits, ImageSize) ==
-                  GIF_ERROR)
-                  return (GIF_ERROR);
-              if (temp_save.ExtensionBlocks) {
-                  sp->ExtensionBlocks = temp_save.ExtensionBlocks;
-                  sp->ExtensionBlockCount = temp_save.ExtensionBlockCount;
-
-                  temp_save.ExtensionBlocks = NULL;
-                  temp_save.ExtensionBlockCount = 0;
-
-                  /* FIXME: The following is wrong.  It is left in only for
-                   * backwards compatibility.  Someday it should go away. Use 
-                   * the sp->ExtensionBlocks->Function variable instead. */
-                  sp->Function = sp->ExtensionBlocks[0].Function;
-              }
-              break;
-
-          case EXTENSION_RECORD_TYPE:
-              if (DGifGetExtension(GifFile, &temp_save.Function, &ExtData) ==
-                  GIF_ERROR)
-                  return (GIF_ERROR);
-              while (ExtData != NULL) {
-
-                  /* Create an extension block with our data */
-                  if (AddExtensionBlock(&temp_save, ExtData[0], &ExtData[1])
-                      == GIF_ERROR)
-                      return (GIF_ERROR);
-
-                  if (DGifGetExtensionNext(GifFile, &ExtData) == GIF_ERROR)
-                      return (GIF_ERROR);
-                  temp_save.Function = 0;
-              }
-              break;
-
-          case TERMINATE_RECORD_TYPE:
-              break;
-
-          default:    /* Should be trapped by DGifGetRecordType */
-              break;
-        }
-    } while (RecordType != TERMINATE_RECORD_TYPE);
-
-    /* Just in case the Gif has an extension block without an associated
-     * image... (Should we save this into a savefile structure with no image
-     * instead? Have to check if the present writing code can handle that as
-     * well.... */
-    if (temp_save.ExtensionBlocks)
-        FreeExtension(&temp_save);
-
-    return (GIF_OK);
-}
-#endif /* _GBA_NO_FILEIO */