auto import from //depot/cupcake/@135843
diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..2453314
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,13 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+ dgif_lib.c \
+ gifalloc.c \
+ gif_err.c
+
+LOCAL_CFLAGS += -Wno-format -DHAVE_CONFIG_H
+
+LOCAL_MODULE:= libgif
+
+include $(BUILD_STATIC_LIBRARY)
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..3193a1b
--- /dev/null
+++ b/config.h
@@ -0,0 +1,13 @@
+
+// giflib config.h
+
+#ifndef GIF_CONFIG_H_DEFINED
+#define GIF_CONFIG_H_DEFINED
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <fcntl.h>
+
+typedef uint32_t UINT32;
+
+#endif
diff --git a/dgif_lib.c b/dgif_lib.c
new file mode 100644
index 0000000..760d053
--- /dev/null
+++ b/dgif_lib.c
@@ -0,0 +1,1098 @@
+/******************************************************************************
+ * "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 */
diff --git a/gif_err.c b/gif_err.c
new file mode 100644
index 0000000..ea977bd
--- /dev/null
+++ b/gif_err.c
@@ -0,0 +1,120 @@
+/*****************************************************************************
+ * "Gif-Lib" - Yet another gif library.
+ *
+ * Written by: Gershon Elber IBM PC Ver 0.1, Jun. 1989
+ *****************************************************************************
+ * Handle error reporting for the GIF library.
+ *****************************************************************************
+ * History:
+ * 17 Jun 89 - Version 1.0 by Gershon Elber.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include "gif_lib.h"
+
+int _GifError = 0;
+
+/*****************************************************************************
+ * Return the last GIF error (0 if none) and reset the error.
+ ****************************************************************************/
+int
+GifLastError(void) {
+ int i = _GifError;
+
+ _GifError = 0;
+
+ return i;
+}
+#ifndef _GBA_NO_FILEIO
+
+/*****************************************************************************
+ * Print the last GIF error to stderr.
+ ****************************************************************************/
+void
+PrintGifError(void) {
+ char *Err;
+
+ switch (_GifError) {
+ case E_GIF_ERR_OPEN_FAILED:
+ Err = "Failed to open given file";
+ break;
+ case E_GIF_ERR_WRITE_FAILED:
+ Err = "Failed to Write to given file";
+ break;
+ case E_GIF_ERR_HAS_SCRN_DSCR:
+ Err = "Screen Descriptor already been set";
+ break;
+ case E_GIF_ERR_HAS_IMAG_DSCR:
+ Err = "Image Descriptor is still active";
+ break;
+ case E_GIF_ERR_NO_COLOR_MAP:
+ Err = "Neither Global Nor Local color map";
+ break;
+ case E_GIF_ERR_DATA_TOO_BIG:
+ Err = "#Pixels bigger than Width * Height";
+ break;
+ case E_GIF_ERR_NOT_ENOUGH_MEM:
+ Err = "Fail to allocate required memory";
+ break;
+ case E_GIF_ERR_DISK_IS_FULL:
+ Err = "Write failed (disk full?)";
+ break;
+ case E_GIF_ERR_CLOSE_FAILED:
+ Err = "Failed to close given file";
+ break;
+ case E_GIF_ERR_NOT_WRITEABLE:
+ Err = "Given file was not opened for write";
+ break;
+ case D_GIF_ERR_OPEN_FAILED:
+ Err = "Failed to open given file";
+ break;
+ case D_GIF_ERR_READ_FAILED:
+ Err = "Failed to Read from given file";
+ break;
+ case D_GIF_ERR_NOT_GIF_FILE:
+ Err = "Given file is NOT GIF file";
+ break;
+ case D_GIF_ERR_NO_SCRN_DSCR:
+ Err = "No Screen Descriptor detected";
+ break;
+ case D_GIF_ERR_NO_IMAG_DSCR:
+ Err = "No Image Descriptor detected";
+ break;
+ case D_GIF_ERR_NO_COLOR_MAP:
+ Err = "Neither Global Nor Local color map";
+ break;
+ case D_GIF_ERR_WRONG_RECORD:
+ Err = "Wrong record type detected";
+ break;
+ case D_GIF_ERR_DATA_TOO_BIG:
+ Err = "#Pixels bigger than Width * Height";
+ break;
+ case D_GIF_ERR_NOT_ENOUGH_MEM:
+ Err = "Fail to allocate required memory";
+ break;
+ case D_GIF_ERR_CLOSE_FAILED:
+ Err = "Failed to close given file";
+ break;
+ case D_GIF_ERR_NOT_READABLE:
+ Err = "Given file was not opened for read";
+ break;
+ case D_GIF_ERR_IMAGE_DEFECT:
+ Err = "Image is defective, decoding aborted";
+ break;
+ case D_GIF_ERR_EOF_TOO_SOON:
+ Err = "Image EOF detected, before image complete";
+ break;
+ default:
+ Err = NULL;
+ break;
+ }
+ if (Err != NULL)
+ fprintf(stderr, "\nGIF-LIB error: %s.\n", Err);
+ else
+ fprintf(stderr, "\nGIF-LIB undefined error %d.\n", _GifError);
+}
+#endif /* _GBA_NO_FILEIO */
diff --git a/gif_hash.h b/gif_hash.h
new file mode 100644
index 0000000..3e23ff3
--- /dev/null
+++ b/gif_hash.h
@@ -0,0 +1,59 @@
+/******************************************************************************
+* Declarations, global to other of the GIF-HASH.C module. *
+* *
+* Written by Gershon Elber, Jun 1989 *
+*******************************************************************************
+* History: *
+* 14 Jun 89 - Version 1.0 by Gershon Elber. *
+******************************************************************************/
+
+#ifndef _GIF_HASH_H_
+#define _GIF_HASH_H_
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+/* Find a thirty-two bit int type */
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_BASETSD_H
+#include <basetsd.h>
+#endif
+
+#define HT_SIZE 8192 /* 12bits = 4096 or twice as big! */
+#define HT_KEY_MASK 0x1FFF /* 13bits keys */
+#define HT_KEY_NUM_BITS 13 /* 13bits keys */
+#define HT_MAX_KEY 8191 /* 13bits - 1, maximal code possible */
+#define HT_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
+
+/* The 32 bits of the long are divided into two parts for the key & code: */
+/* 1. The code is 12 bits as our compression algorithm is limited to 12bits */
+/* 2. The key is 12 bits Prefix code + 8 bit new char or 20 bits. */
+/* The key is the upper 20 bits. The code is the lower 12. */
+#define HT_GET_KEY(l) (l >> 12)
+#define HT_GET_CODE(l) (l & 0x0FFF)
+#define HT_PUT_KEY(l) (l << 12)
+#define HT_PUT_CODE(l) (l & 0x0FFF)
+
+typedef struct GifHashTableType {
+ UINT32 HTable[HT_SIZE];
+} GifHashTableType;
+
+GifHashTableType *_InitHashTable(void);
+void _ClearHashTable(GifHashTableType *HashTable);
+void _InsertHashTable(GifHashTableType *HashTable, UINT32 Key, int Code);
+int _ExistsHashTable(GifHashTableType *HashTable, UINT32 Key);
+
+#endif /* _GIF_HASH_H_ */
diff --git a/gif_lib.h b/gif_lib.h
new file mode 100644
index 0000000..f0cf858
--- /dev/null
+++ b/gif_lib.h
@@ -0,0 +1,336 @@
+/******************************************************************************
+ * In order to make life a little bit easier when using the GIF file format,
+ * this library was written, and which does all the dirty work...
+ *
+ * Written by Gershon Elber, Jun. 1989
+ * Hacks by Eric S. Raymond, Sep. 1992
+ ******************************************************************************
+ * History:
+ * 14 Jun 89 - Version 1.0 by Gershon Elber.
+ * 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names)
+ * 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to suoport GIF slurp)
+ * 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support)
+ * 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code)
+ *****************************************************************************/
+
+#ifndef _GIF_LIB_H_
+#define _GIF_LIB_H_ 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define GIF_LIB_VERSION " Version 4.1, "
+
+#define GIF_ERROR 0
+#define GIF_OK 1
+
+#ifndef TRUE
+#define TRUE 1
+#endif /* TRUE */
+#ifndef FALSE
+#define FALSE 0
+#endif /* FALSE */
+
+#ifndef NULL
+#define NULL 0
+#endif /* NULL */
+
+#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
+#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
+#define GIF_VERSION_POS 3 /* Version first character in stamp. */
+#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
+#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
+
+#define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */
+
+typedef int GifBooleanType;
+typedef unsigned char GifPixelType;
+typedef unsigned char *GifRowType;
+typedef unsigned char GifByteType;
+#ifdef _GBA_OPTMEM
+ typedef unsigned short GifPrefixType;
+ typedef short GifWord;
+#else
+ typedef unsigned int GifPrefixType;
+ typedef int GifWord;
+#endif
+
+#define GIF_MESSAGE(Msg) fprintf(stderr, "\n%s: %s\n", PROGRAM_NAME, Msg)
+#define GIF_EXIT(Msg) { GIF_MESSAGE(Msg); exit(-3); }
+
+#ifdef SYSV
+#define VoidPtr char *
+#else
+#define VoidPtr void *
+#endif /* SYSV */
+
+typedef struct GifColorType {
+ GifByteType Red, Green, Blue;
+} GifColorType;
+
+typedef struct ColorMapObject {
+ int ColorCount;
+ int BitsPerPixel;
+ GifColorType *Colors; /* on malloc(3) heap */
+} ColorMapObject;
+
+typedef struct GifImageDesc {
+ GifWord Left, Top, Width, Height, /* Current image dimensions. */
+ Interlace; /* Sequential/Interlaced lines. */
+ ColorMapObject *ColorMap; /* The local color map */
+} GifImageDesc;
+
+typedef struct GifFileType {
+ GifWord SWidth, SHeight, /* Screen dimensions. */
+ SColorResolution, /* How many colors can we generate? */
+ SBackGroundColor; /* I hope you understand this one... */
+ ColorMapObject *SColorMap; /* NULL if not exists. */
+ int ImageCount; /* Number of current image */
+ GifImageDesc Image; /* Block describing current image */
+ struct SavedImage *SavedImages; /* Use this to accumulate file state */
+ VoidPtr UserData; /* hook to attach user data (TVT) */
+ VoidPtr Private; /* Don't mess with this! */
+} GifFileType;
+
+typedef enum {
+ UNDEFINED_RECORD_TYPE,
+ SCREEN_DESC_RECORD_TYPE,
+ IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
+ EXTENSION_RECORD_TYPE, /* Begin with '!' */
+ TERMINATE_RECORD_TYPE /* Begin with ';' */
+} GifRecordType;
+
+/* DumpScreen2Gif routine constants identify type of window/screen to dump.
+ * Note all values below 1000 are reserved for the IBMPC different display
+ * devices (it has many!) and are compatible with the numbering TC2.0
+ * (Turbo C 2.0 compiler for IBM PC) gives to these devices.
+ */
+typedef enum {
+ GIF_DUMP_SGI_WINDOW = 1000,
+ GIF_DUMP_X_WINDOW = 1001
+} GifScreenDumpType;
+
+/* func type to read gif data from arbitrary sources (TVT) */
+typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
+
+/* func type to write gif data ro arbitrary targets.
+ * Returns count of bytes written. (MRB)
+ */
+typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int);
+
+/******************************************************************************
+ * GIF89 extension function codes
+******************************************************************************/
+
+#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
+#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */
+#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
+#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
+
+/******************************************************************************
+ * O.K., here are the routines one can access in order to encode GIF file:
+ * (GIF_LIB file EGIF_LIB.C).
+******************************************************************************/
+
+GifFileType *EGifOpenFileName(const char *GifFileName,
+ int GifTestExistance);
+GifFileType *EGifOpenFileHandle(int GifFileHandle);
+GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc);
+
+int EGifSpew(GifFileType * GifFile);
+void EGifSetGifVersion(const char *Version);
+int EGifPutScreenDesc(GifFileType * GifFile,
+ int GifWidth, int GifHeight, int GifColorRes,
+ int GifBackGround,
+ const ColorMapObject * GifColorMap);
+int EGifPutImageDesc(GifFileType * GifFile, int GifLeft, int GifTop,
+ int Width, int GifHeight, int GifInterlace,
+ const ColorMapObject * GifColorMap);
+int EGifPutLine(GifFileType * GifFile, GifPixelType * GifLine,
+ int GifLineLen);
+int EGifPutPixel(GifFileType * GifFile, GifPixelType GifPixel);
+int EGifPutComment(GifFileType * GifFile, const char *GifComment);
+int EGifPutExtensionFirst(GifFileType * GifFile, int GifExtCode,
+ int GifExtLen, const VoidPtr GifExtension);
+int EGifPutExtensionNext(GifFileType * GifFile, int GifExtCode,
+ int GifExtLen, const VoidPtr GifExtension);
+int EGifPutExtensionLast(GifFileType * GifFile, int GifExtCode,
+ int GifExtLen, const VoidPtr GifExtension);
+int EGifPutExtension(GifFileType * GifFile, int GifExtCode, int GifExtLen,
+ const VoidPtr GifExtension);
+int EGifPutCode(GifFileType * GifFile, int GifCodeSize,
+ const GifByteType * GifCodeBlock);
+int EGifPutCodeNext(GifFileType * GifFile,
+ const GifByteType * GifCodeBlock);
+int EGifCloseFile(GifFileType * GifFile);
+
+#define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */
+#define E_GIF_ERR_WRITE_FAILED 2
+#define E_GIF_ERR_HAS_SCRN_DSCR 3
+#define E_GIF_ERR_HAS_IMAG_DSCR 4
+#define E_GIF_ERR_NO_COLOR_MAP 5
+#define E_GIF_ERR_DATA_TOO_BIG 6
+#define E_GIF_ERR_NOT_ENOUGH_MEM 7
+#define E_GIF_ERR_DISK_IS_FULL 8
+#define E_GIF_ERR_CLOSE_FAILED 9
+#define E_GIF_ERR_NOT_WRITEABLE 10
+
+/******************************************************************************
+ * O.K., here are the routines one can access in order to decode GIF file:
+ * (GIF_LIB file DGIF_LIB.C).
+ *****************************************************************************/
+#ifndef _GBA_NO_FILEIO
+GifFileType *DGifOpenFileName(const char *GifFileName);
+GifFileType *DGifOpenFileHandle(int GifFileHandle);
+int DGifSlurp(GifFileType * GifFile);
+#endif /* _GBA_NO_FILEIO */
+GifFileType *DGifOpen(void *userPtr, InputFunc readFunc); /* new one
+ * (TVT) */
+int DGifGetScreenDesc(GifFileType * GifFile);
+int DGifGetRecordType(GifFileType * GifFile, GifRecordType * GifType);
+int DGifGetImageDesc(GifFileType * GifFile);
+int DGifGetLine(GifFileType * GifFile, GifPixelType * GifLine, int GifLineLen);
+int DGifGetPixel(GifFileType * GifFile, GifPixelType GifPixel);
+int DGifGetComment(GifFileType * GifFile, char *GifComment);
+int DGifGetExtension(GifFileType * GifFile, int *GifExtCode,
+ GifByteType ** GifExtension);
+int DGifGetExtensionNext(GifFileType * GifFile, GifByteType ** GifExtension);
+int DGifGetCode(GifFileType * GifFile, int *GifCodeSize,
+ GifByteType ** GifCodeBlock);
+int DGifGetCodeNext(GifFileType * GifFile, GifByteType ** GifCodeBlock);
+int DGifGetLZCodes(GifFileType * GifFile, int *GifCode);
+int DGifCloseFile(GifFileType * GifFile);
+
+#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
+#define D_GIF_ERR_READ_FAILED 102
+#define D_GIF_ERR_NOT_GIF_FILE 103
+#define D_GIF_ERR_NO_SCRN_DSCR 104
+#define D_GIF_ERR_NO_IMAG_DSCR 105
+#define D_GIF_ERR_NO_COLOR_MAP 106
+#define D_GIF_ERR_WRONG_RECORD 107
+#define D_GIF_ERR_DATA_TOO_BIG 108
+#define D_GIF_ERR_NOT_ENOUGH_MEM 109
+#define D_GIF_ERR_CLOSE_FAILED 110
+#define D_GIF_ERR_NOT_READABLE 111
+#define D_GIF_ERR_IMAGE_DEFECT 112
+#define D_GIF_ERR_EOF_TOO_SOON 113
+
+/******************************************************************************
+ * O.K., here are the routines from GIF_LIB file QUANTIZE.C.
+******************************************************************************/
+int QuantizeBuffer(unsigned int Width, unsigned int Height,
+ int *ColorMapSize, GifByteType * RedInput,
+ GifByteType * GreenInput, GifByteType * BlueInput,
+ GifByteType * OutputBuffer,
+ GifColorType * OutputColorMap);
+
+/******************************************************************************
+ * O.K., here are the routines from GIF_LIB file QPRINTF.C.
+******************************************************************************/
+extern int GifQuietPrint;
+
+#ifdef HAVE_STDARG_H
+ extern void GifQprintf(char *Format, ...);
+#elif defined (HAVE_VARARGS_H)
+ extern void GifQprintf();
+#endif /* HAVE_STDARG_H */
+
+/******************************************************************************
+ * O.K., here are the routines from GIF_LIB file GIF_ERR.C.
+******************************************************************************/
+#ifndef _GBA_NO_FILEIO
+extern void PrintGifError(void);
+#endif /* _GBA_NO_FILEIO */
+extern int GifLastError(void);
+
+/******************************************************************************
+ * O.K., here are the routines from GIF_LIB file DEV2GIF.C.
+******************************************************************************/
+extern int DumpScreen2Gif(const char *FileName,
+ int ReqGraphDriver,
+ long ReqGraphMode1,
+ long ReqGraphMode2,
+ long ReqGraphMode3);
+
+/*****************************************************************************
+ *
+ * Everything below this point is new after version 1.2, supporting `slurp
+ * mode' for doing I/O in two big belts with all the image-bashing in core.
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+ * Color Map handling from ALLOCGIF.C
+ *****************************************************************************/
+
+extern ColorMapObject *MakeMapObject(int ColorCount,
+ const GifColorType * ColorMap);
+extern void FreeMapObject(ColorMapObject * Object);
+extern ColorMapObject *UnionColorMap(const ColorMapObject * ColorIn1,
+ const ColorMapObject * ColorIn2,
+ GifPixelType ColorTransIn2[]);
+extern int BitSize(int n);
+
+/******************************************************************************
+ * Support for the in-core structures allocation (slurp mode).
+ *****************************************************************************/
+
+/* This is the in-core version of an extension record */
+typedef struct {
+ int ByteCount;
+ char *Bytes; /* on malloc(3) heap */
+ int Function; /* Holds the type of the Extension block. */
+} ExtensionBlock;
+
+/* This holds an image header, its unpacked raster bits, and extensions */
+typedef struct SavedImage {
+ GifImageDesc ImageDesc;
+ unsigned char *RasterBits; /* on malloc(3) heap */
+ int Function; /* DEPRECATED: Use ExtensionBlocks[x].Function instead */
+ int ExtensionBlockCount;
+ ExtensionBlock *ExtensionBlocks; /* on malloc(3) heap */
+} SavedImage;
+
+extern void ApplyTranslation(SavedImage * Image, GifPixelType Translation[]);
+extern void MakeExtension(SavedImage * New, int Function);
+extern int AddExtensionBlock(SavedImage * New, int Len,
+ unsigned char ExtData[]);
+extern void FreeExtension(SavedImage * Image);
+extern SavedImage *MakeSavedImage(GifFileType * GifFile,
+ const SavedImage * CopyFrom);
+extern void FreeSavedImages(GifFileType * GifFile);
+
+/******************************************************************************
+ * The library's internal utility font
+ *****************************************************************************/
+
+#define GIF_FONT_WIDTH 8
+#define GIF_FONT_HEIGHT 8
+extern unsigned char AsciiTable[][GIF_FONT_WIDTH];
+
+#ifdef _WIN32
+ extern void DrawGifText(SavedImage * Image,
+#else
+ extern void DrawGifText(SavedImage * Image,
+#endif
+ const int x, const int y,
+ const char *legend, const int color);
+
+extern void DrawBox(SavedImage * Image,
+ const int x, const int y,
+ const int w, const int d, const int color);
+
+void DrawRectangle(SavedImage * Image,
+ const int x, const int y,
+ const int w, const int d, const int color);
+
+extern void DrawBoxedText(SavedImage * Image,
+ const int x, const int y,
+ const char *legend,
+ const int border, const int bg, const int fg);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* _GIF_LIB_H */
diff --git a/gif_lib_private.h b/gif_lib_private.h
new file mode 100644
index 0000000..b31c9c5
--- /dev/null
+++ b/gif_lib_private.h
@@ -0,0 +1,59 @@
+#ifndef _GIF_LIB_PRIVATE_H
+#define _GIF_LIB_PRIVATE_H
+
+#include "gif_lib.h"
+#include "gif_hash.h"
+
+#define PROGRAM_NAME "GIFLIB"
+
+#ifdef SYSV
+#define VersionStr "Gif library module,\t\tEric S. Raymond\n\
+ (C) Copyright 1997 Eric S. Raymond\n"
+#else
+#define VersionStr PROGRAM_NAME " IBMPC " GIF_LIB_VERSION \
+ " Eric S. Raymond, " __DATE__ ", " \
+ __TIME__ "\n" "(C) Copyright 1997 Eric S. Raymond\n"
+#endif /* SYSV */
+
+#define LZ_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
+#define LZ_BITS 12
+
+#define FLUSH_OUTPUT 4096 /* Impossible code, to signal flush. */
+#define FIRST_CODE 4097 /* Impossible code, to signal first. */
+#define NO_SUCH_CODE 4098 /* Impossible code, to signal empty. */
+
+#define FILE_STATE_WRITE 0x01
+#define FILE_STATE_SCREEN 0x02
+#define FILE_STATE_IMAGE 0x04
+#define FILE_STATE_READ 0x08
+
+#define IS_READABLE(Private) (Private->FileState & FILE_STATE_READ)
+#define IS_WRITEABLE(Private) (Private->FileState & FILE_STATE_WRITE)
+
+typedef struct GifFilePrivateType {
+ GifWord FileState, FileHandle, /* Where all this data goes to! */
+ BitsPerPixel, /* Bits per pixel (Codes uses at least this + 1). */
+ ClearCode, /* The CLEAR LZ code. */
+ EOFCode, /* The EOF LZ code. */
+ RunningCode, /* The next code algorithm can generate. */
+ RunningBits, /* The number of bits required to represent RunningCode. */
+ MaxCode1, /* 1 bigger than max. possible code, in RunningBits bits. */
+ LastCode, /* The code before the current code. */
+ CrntCode, /* Current algorithm code. */
+ StackPtr, /* For character stack (see below). */
+ CrntShiftState; /* Number of bits in CrntShiftDWord. */
+ unsigned long CrntShiftDWord; /* For bytes decomposition into codes. */
+ unsigned long PixelCount; /* Number of pixels in image. */
+ FILE *File; /* File as stream. */
+ InputFunc Read; /* function to read gif input (TVT) */
+ OutputFunc Write; /* function to write gif output (MRB) */
+ GifByteType Buf[256]; /* Compressed input is buffered here. */
+ GifByteType Stack[LZ_MAX_CODE]; /* Decoded pixels are stacked here. */
+ GifByteType Suffix[LZ_MAX_CODE + 1]; /* So we can trace the codes. */
+ GifPrefixType Prefix[LZ_MAX_CODE + 1];
+ GifHashTableType *HashTable;
+} GifFilePrivateType;
+
+extern int _GifError;
+
+#endif /* _GIF_LIB_PRIVATE_H */
diff --git a/gifalloc.c b/gifalloc.c
new file mode 100644
index 0000000..79d2332
--- /dev/null
+++ b/gifalloc.c
@@ -0,0 +1,443 @@
+/*****************************************************************************
+ * "Gif-Lib" - Yet another gif library.
+ *
+ * Written by: Gershon Elber Ver 0.1, Jun. 1989
+ * Extensively hacked by: Eric S. Raymond Ver 1.?, Sep 1992
+ *****************************************************************************
+ * GIF construction tools
+ *****************************************************************************
+ * History:
+ * 15 Sep 92 - Version 1.0 by Eric Raymond.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "gif_lib.h"
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+
+/******************************************************************************
+ * Miscellaneous utility functions
+ *****************************************************************************/
+
+/* return smallest bitfield size n will fit in */
+int
+BitSize(int n) {
+
+ register int i;
+
+ for (i = 1; i <= 8; i++)
+ if ((1 << i) >= n)
+ break;
+ return (i);
+}
+
+/******************************************************************************
+ * Color map object functions
+ *****************************************************************************/
+
+/*
+ * Allocate a color map of given size; initialize with contents of
+ * ColorMap if that pointer is non-NULL.
+ */
+ColorMapObject *
+MakeMapObject(int ColorCount,
+ const GifColorType * ColorMap) {
+
+ ColorMapObject *Object;
+
+ /*** FIXME: Our ColorCount has to be a power of two. Is it necessary to
+ * make the user know that or should we automatically round up instead? */
+ if (ColorCount != (1 << BitSize(ColorCount))) {
+ return ((ColorMapObject *) NULL);
+ }
+
+ Object = (ColorMapObject *)malloc(sizeof(ColorMapObject));
+ if (Object == (ColorMapObject *) NULL) {
+ return ((ColorMapObject *) NULL);
+ }
+
+ Object->Colors = (GifColorType *)calloc(ColorCount, sizeof(GifColorType));
+ if (Object->Colors == (GifColorType *) NULL) {
+ return ((ColorMapObject *) NULL);
+ }
+
+ Object->ColorCount = ColorCount;
+ Object->BitsPerPixel = BitSize(ColorCount);
+
+ if (ColorMap) {
+ memcpy((char *)Object->Colors,
+ (char *)ColorMap, ColorCount * sizeof(GifColorType));
+ }
+
+ return (Object);
+}
+
+/*
+ * Free a color map object
+ */
+void
+FreeMapObject(ColorMapObject * Object) {
+
+ if (Object != NULL) {
+ free(Object->Colors);
+ free(Object);
+ /*** FIXME:
+ * When we are willing to break API we need to make this function
+ * FreeMapObject(ColorMapObject **Object)
+ * and do this assignment to NULL here:
+ * *Object = NULL;
+ */
+ }
+}
+
+#ifdef DEBUG
+void
+DumpColorMap(ColorMapObject * Object,
+ FILE * fp) {
+
+ if (Object) {
+ int i, j, Len = Object->ColorCount;
+
+ for (i = 0; i < Len; i += 4) {
+ for (j = 0; j < 4 && j < Len; j++) {
+ fprintf(fp, "%3d: %02x %02x %02x ", i + j,
+ Object->Colors[i + j].Red,
+ Object->Colors[i + j].Green,
+ Object->Colors[i + j].Blue);
+ }
+ fprintf(fp, "\n");
+ }
+ }
+}
+#endif /* DEBUG */
+
+/*
+ * Compute the union of two given color maps and return it. If result can't
+ * fit into 256 colors, NULL is returned, the allocated union otherwise.
+ * ColorIn1 is copied as is to ColorUnion, while colors from ColorIn2 are
+ * copied iff they didn't exist before. ColorTransIn2 maps the old
+ * ColorIn2 into ColorUnion color map table.
+ */
+ColorMapObject *
+UnionColorMap(const ColorMapObject * ColorIn1,
+ const ColorMapObject * ColorIn2,
+ GifPixelType ColorTransIn2[]) {
+
+ int i, j, CrntSlot, RoundUpTo, NewBitSize;
+ ColorMapObject *ColorUnion;
+
+ /*
+ * Allocate table which will hold the result for sure.
+ */
+ ColorUnion = MakeMapObject(MAX(ColorIn1->ColorCount,
+ ColorIn2->ColorCount) * 2, NULL);
+
+ if (ColorUnion == NULL)
+ return (NULL);
+
+ /* Copy ColorIn1 to ColorUnionSize; */
+ /*** FIXME: What if there are duplicate entries into the colormap to begin
+ * with? */
+ for (i = 0; i < ColorIn1->ColorCount; i++)
+ ColorUnion->Colors[i] = ColorIn1->Colors[i];
+ CrntSlot = ColorIn1->ColorCount;
+
+ /*
+ * Potentially obnoxious hack:
+ *
+ * Back CrntSlot down past all contiguous {0, 0, 0} slots at the end
+ * of table 1. This is very useful if your display is limited to
+ * 16 colors.
+ */
+ while (ColorIn1->Colors[CrntSlot - 1].Red == 0
+ && ColorIn1->Colors[CrntSlot - 1].Green == 0
+ && ColorIn1->Colors[CrntSlot - 1].Blue == 0)
+ CrntSlot--;
+
+ /* Copy ColorIn2 to ColorUnionSize (use old colors if they exist): */
+ for (i = 0; i < ColorIn2->ColorCount && CrntSlot <= 256; i++) {
+ /* Let's see if this color already exists: */
+ /*** FIXME: Will it ever occur that ColorIn2 will contain duplicate
+ * entries? So we should search from 0 to CrntSlot rather than
+ * ColorIn1->ColorCount?
+ */
+ for (j = 0; j < ColorIn1->ColorCount; j++)
+ if (memcmp (&ColorIn1->Colors[j], &ColorIn2->Colors[i],
+ sizeof(GifColorType)) == 0)
+ break;
+
+ if (j < ColorIn1->ColorCount)
+ ColorTransIn2[i] = j; /* color exists in Color1 */
+ else {
+ /* Color is new - copy it to a new slot: */
+ ColorUnion->Colors[CrntSlot] = ColorIn2->Colors[i];
+ ColorTransIn2[i] = CrntSlot++;
+ }
+ }
+
+ if (CrntSlot > 256) {
+ FreeMapObject(ColorUnion);
+ return ((ColorMapObject *) NULL);
+ }
+
+ NewBitSize = BitSize(CrntSlot);
+ RoundUpTo = (1 << NewBitSize);
+
+ if (RoundUpTo != ColorUnion->ColorCount) {
+ register GifColorType *Map = ColorUnion->Colors;
+
+ /*
+ * Zero out slots up to next power of 2.
+ * We know these slots exist because of the way ColorUnion's
+ * start dimension was computed.
+ */
+ for (j = CrntSlot; j < RoundUpTo; j++)
+ Map[j].Red = Map[j].Green = Map[j].Blue = 0;
+
+ /* perhaps we can shrink the map? */
+ if (RoundUpTo < ColorUnion->ColorCount)
+ ColorUnion->Colors = (GifColorType *)realloc(Map,
+ sizeof(GifColorType) * RoundUpTo);
+ }
+
+ ColorUnion->ColorCount = RoundUpTo;
+ ColorUnion->BitsPerPixel = NewBitSize;
+
+ return (ColorUnion);
+}
+
+/*
+ * Apply a given color translation to the raster bits of an image
+ */
+void
+ApplyTranslation(SavedImage * Image,
+ GifPixelType Translation[]) {
+
+ register int i;
+ register int RasterSize = Image->ImageDesc.Height * Image->ImageDesc.Width;
+
+ for (i = 0; i < RasterSize; i++)
+ Image->RasterBits[i] = Translation[Image->RasterBits[i]];
+}
+
+/******************************************************************************
+ * Extension record functions
+ *****************************************************************************/
+
+void
+MakeExtension(SavedImage * New,
+ int Function) {
+
+ New->Function = Function;
+ /*** FIXME:
+ * Someday we might have to deal with multiple extensions.
+ * ??? Was this a note from Gershon or from me? Does the multiple
+ * extension blocks solve this or do we need multiple Functions? Or is
+ * this an obsolete function? (People should use AddExtensionBlock
+ * instead?)
+ * Looks like AddExtensionBlock needs to take the int Function argument
+ * then it can take the place of this function. Right now people have to
+ * use both. Fix AddExtensionBlock and add this to the deprecation list.
+ */
+}
+
+int
+AddExtensionBlock(SavedImage * New,
+ int Len,
+ unsigned char ExtData[]) {
+
+ ExtensionBlock *ep;
+
+ if (New->ExtensionBlocks == NULL)
+ New->ExtensionBlocks=(ExtensionBlock *)malloc(sizeof(ExtensionBlock));
+ else
+ New->ExtensionBlocks = (ExtensionBlock *)realloc(New->ExtensionBlocks,
+ sizeof(ExtensionBlock) *
+ (New->ExtensionBlockCount + 1));
+
+ if (New->ExtensionBlocks == NULL)
+ return (GIF_ERROR);
+
+ ep = &New->ExtensionBlocks[New->ExtensionBlockCount++];
+
+ ep->ByteCount=Len;
+ ep->Bytes = (char *)malloc(ep->ByteCount);
+ if (ep->Bytes == NULL)
+ return (GIF_ERROR);
+
+ if (ExtData) {
+ memcpy(ep->Bytes, ExtData, Len);
+ ep->Function = New->Function;
+ }
+
+ return (GIF_OK);
+}
+
+void
+FreeExtension(SavedImage * Image)
+{
+ ExtensionBlock *ep;
+
+ if ((Image == NULL) || (Image->ExtensionBlocks == NULL)) {
+ return;
+ }
+ for (ep = Image->ExtensionBlocks;
+ ep < (Image->ExtensionBlocks + Image->ExtensionBlockCount); ep++)
+ (void)free((char *)ep->Bytes);
+ free((char *)Image->ExtensionBlocks);
+ Image->ExtensionBlocks = NULL;
+}
+
+/******************************************************************************
+ * Image block allocation functions
+******************************************************************************/
+
+/* Private Function:
+ * Frees the last image in the GifFile->SavedImages array
+ */
+void
+FreeLastSavedImage(GifFileType *GifFile) {
+
+ SavedImage *sp;
+
+ if ((GifFile == NULL) || (GifFile->SavedImages == NULL))
+ return;
+
+ /* Remove one SavedImage from the GifFile */
+ GifFile->ImageCount--;
+ sp = &GifFile->SavedImages[GifFile->ImageCount];
+
+ /* Deallocate its Colormap */
+ if (sp->ImageDesc.ColorMap) {
+ FreeMapObject(sp->ImageDesc.ColorMap);
+ sp->ImageDesc.ColorMap = NULL;
+ }
+
+ /* Deallocate the image data */
+ if (sp->RasterBits)
+ free((char *)sp->RasterBits);
+
+ /* Deallocate any extensions */
+ if (sp->ExtensionBlocks)
+ FreeExtension(sp);
+
+ /*** FIXME: We could realloc the GifFile->SavedImages structure but is
+ * there a point to it? Saves some memory but we'd have to do it every
+ * time. If this is used in FreeSavedImages then it would be inefficient
+ * (The whole array is going to be deallocated.) If we just use it when
+ * we want to free the last Image it's convenient to do it here.
+ */
+}
+
+/*
+ * Append an image block to the SavedImages array
+ */
+SavedImage *
+MakeSavedImage(GifFileType * GifFile,
+ const SavedImage * CopyFrom) {
+
+ SavedImage *sp;
+
+ if (GifFile->SavedImages == NULL)
+ GifFile->SavedImages = (SavedImage *)malloc(sizeof(SavedImage));
+ else
+ GifFile->SavedImages = (SavedImage *)realloc(GifFile->SavedImages,
+ sizeof(SavedImage) * (GifFile->ImageCount + 1));
+
+ if (GifFile->SavedImages == NULL)
+ return ((SavedImage *)NULL);
+ else {
+ sp = &GifFile->SavedImages[GifFile->ImageCount++];
+ memset((char *)sp, '\0', sizeof(SavedImage));
+
+ if (CopyFrom) {
+ memcpy((char *)sp, CopyFrom, sizeof(SavedImage));
+
+ /*
+ * Make our own allocated copies of the heap fields in the
+ * copied record. This guards against potential aliasing
+ * problems.
+ */
+
+ /* first, the local color map */
+ if (sp->ImageDesc.ColorMap) {
+ sp->ImageDesc.ColorMap = MakeMapObject(
+ CopyFrom->ImageDesc.ColorMap->ColorCount,
+ CopyFrom->ImageDesc.ColorMap->Colors);
+ if (sp->ImageDesc.ColorMap == NULL) {
+ FreeLastSavedImage(GifFile);
+ return (SavedImage *)(NULL);
+ }
+ }
+
+ /* next, the raster */
+ sp->RasterBits = (unsigned char *)malloc(sizeof(GifPixelType) *
+ CopyFrom->ImageDesc.Height *
+ CopyFrom->ImageDesc.Width);
+ if (sp->RasterBits == NULL) {
+ FreeLastSavedImage(GifFile);
+ return (SavedImage *)(NULL);
+ }
+ memcpy(sp->RasterBits, CopyFrom->RasterBits,
+ sizeof(GifPixelType) * CopyFrom->ImageDesc.Height *
+ CopyFrom->ImageDesc.Width);
+
+ /* finally, the extension blocks */
+ if (sp->ExtensionBlocks) {
+ sp->ExtensionBlocks = (ExtensionBlock *)malloc(
+ sizeof(ExtensionBlock) *
+ CopyFrom->ExtensionBlockCount);
+ if (sp->ExtensionBlocks == NULL) {
+ FreeLastSavedImage(GifFile);
+ return (SavedImage *)(NULL);
+ }
+ memcpy(sp->ExtensionBlocks, CopyFrom->ExtensionBlocks,
+ sizeof(ExtensionBlock) * CopyFrom->ExtensionBlockCount);
+
+ /*
+ * For the moment, the actual blocks can take their
+ * chances with free(). We'll fix this later.
+ *** FIXME: [Better check this out... Toshio]
+ * 2004 May 27: Looks like this was an ESR note.
+ * It means the blocks are shallow copied from InFile to
+ * OutFile. However, I don't see that in this code....
+ * Did ESR fix it but never remove this note (And other notes
+ * in gifspnge?)
+ */
+ }
+ }
+
+ return (sp);
+ }
+}
+
+void
+FreeSavedImages(GifFileType * GifFile) {
+
+ SavedImage *sp;
+
+ if ((GifFile == NULL) || (GifFile->SavedImages == NULL)) {
+ return;
+ }
+ for (sp = GifFile->SavedImages;
+ sp < GifFile->SavedImages + GifFile->ImageCount; sp++) {
+ if (sp->ImageDesc.ColorMap) {
+ FreeMapObject(sp->ImageDesc.ColorMap);
+ sp->ImageDesc.ColorMap = NULL;
+ }
+
+ if (sp->RasterBits)
+ free((char *)sp->RasterBits);
+
+ if (sp->ExtensionBlocks)
+ FreeExtension(sp);
+ }
+ free((char *)GifFile->SavedImages);
+ GifFile->SavedImages=NULL;
+}
