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-rw-r--r--Build/source/utils/sam2p/cgif.c1572
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diff --git a/Build/source/utils/sam2p/cgif.c b/Build/source/utils/sam2p/cgif.c
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+/* cgif.c -- a merge of some GIF-decoding files from giflib by E.S.Raymond
+ * by pts@fazekas.hu at Wed Feb 27 13:18:04 CET 2002
+
+The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+ */
+
+/*The creators of the GIF format require the following
+ acknowledgement:
+ The Graphics Interchange Format(c) is the Copyright property of
+ CompuServe Incorporated. GIF(sm) is a Service Mark property of
+ CompuServe Incorporated.
+*/
+
+#ifdef __GNUC__
+#pragma implementation
+#endif
+
+/**** pts: not an ANSI C function */
+#undef EXTERN_C
+#ifdef __cplusplus
+#define EXTERN_C extern "C"
+#define CGIFFF CGIF::
+#else
+#define EXTERN_C extern
+#define CGIFFF
+#endif
+#if OBJDEP
+# warning PROVIDES: cgif
+#endif
+
+#if 0
+EXTERN_C FILE *fdopen (int fildes, const char *mode); /* GCC 3.0 SUXX */
+#else
+#undef _POSIX_SOURCE
+#define _POSIX_SOURCE 1
+#undef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 2
+#endif
+
+/* --- gifalloc.c */
+
+/*****************************************************************************
+* "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. *
+*****************************************************************************/
+
+// #undef __STRICT_ANSI__ /* for MINGW32 open() !! */
+#include <stdio.h>
+#include "cgif.h"
+
+/**** pts ****/
+#include <stdlib.h> /* malloc(), calloc(), free(), realloc() */
+#include <string.h> /* memset() */
+
+
+//#include <unistd.h>
+
+#if USE_CGIF_FDOPEN
+#include <fcntl.h> /* open() */
+#include <sys/types.h>
+#include <sys/stat.h>
+# if defined(__MINGW32__) || defined(__CYGWIN__) || defined(_MSC_VER)
+# undef __STRICT_ANSI__
+# include <io.h>
+ /*#define open _open*/
+# endif
+#endif
+
+/* --- gif_err.c */
+
+/*****************************************************************************
+* "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. *
+*****************************************************************************/
+
+/* #include <stdio.h> already */
+/* #include "gif_lib.h" already */
+
+/* --- dgif_lib.c */
+
+/******************************************************************************
+* "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 __MSDOS__
+#include <io.h>
+#include <alloc.h>
+#include <stdlib.h>
+#include <sys\stat.h>
+#else
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif /* __MSDOS__ */
+
+#include <fcntl.h>
+/* #include <stdio.h> already */
+/* #include <string.h> already */
+/* #include "gif_lib.h" already */
+
+/* #include <stdlib.h> already */ /* malloc(), free() */
+#include <assert.h>
+
+/* ---- */
+
+/* --- gif_err.c */
+
+/* #define PROGRAM_NAME "GIF_LIBRARY" */
+
+int CGIFFF _GifError = 0;
+
+/*****************************************************************************
+* Return the last GIF error (0 if none) and reset the error. *
+*****************************************************************************/
+int CGIFFF GifLastError(void)
+{
+ int i = _GifError;
+
+ _GifError = 0;
+
+ return i;
+}
+
+/**** pts ****/
+/** May return NULL. */
+char *CGIFFF GetGifError(void)
+{
+ char *Err;
+
+ switch(_GifError) {
+#if 0 /**** pts ****/
+ 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;
+#endif
+ 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;
+ }
+ return Err;
+}
+
+/*****************************************************************************
+* Print the last GIF error to stderr. *
+*****************************************************************************/
+void CGIFFF PrintGifError(void)
+{
+ char *Err=GetGifError();
+ if (Err != NULL)
+ fprintf(stderr, "\nGIF-LIB error: %s.\n", Err);
+ else
+ fprintf(stderr, "\nGIF-LIB undefined error %d.\n", _GifError);
+}
+
+/* --- gifalloc.c */
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+
+/******************************************************************************
+* Miscellaneous utility functions *
+******************************************************************************/
+
+static int BitSize(int n)
+/* return smallest bitfield size n will fit in */
+{
+ register int i;
+
+ for (i = 1; i <= 8; i++)
+ if ((1 << i) >= n)
+ break;
+ return(i);
+}
+
+
+/******************************************************************************
+* Color map object functions *
+******************************************************************************/
+
+CGIFFF ColorMapObject *CGIFFF MakeMapObject(int ColorCount, GifColorType *ColorMap)
+/*
+ * Allocate a color map of given size; initialize with contents of
+ * ColorMap if that pointer is non-NULL.
+ */
+{
+ ColorMapObject *Object;
+
+ 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);
+}
+
+void CGIFFF FreeMapObject(CGIFFF ColorMapObject *Object)
+/*
+ * Free a color map object
+ */
+{
+ free(Object->Colors);
+ free(Object);
+}
+
+#if 0
+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 */
+
+#if 0
+ColorMapObject *CGIFFF UnionColorMap(
+ ColorMapObject *ColorIn1,
+ ColorMapObject *ColorIn2,
+ GifPixelType ColorTransIn2[])
+/*
+ * 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.
+ */
+{
+ 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; */
+ 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].Red == 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: */
+ 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);
+}
+void ApplyTranslation(SavedImage *Image, GifPixelType Translation[])
+/*
+ * Apply a given color translation to the raster bits of an image
+ */
+{
+ 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]];
+}
+#endif
+
+/******************************************************************************
+* Extension record functions *
+******************************************************************************/
+
+#if 0 /**** pts ****/
+void MakeExtension(SavedImage *New, int Function)
+{
+ New->Function = Function;
+ /*
+ * Someday we might have to deal with multiple extensions.
+ */
+}
+#endif
+
+int CGIFFF AddExtensionBlock(CGIFFF SavedImage *New, int Len, CGIFFF GifByteType 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++];
+
+ if ((ep->Bytes = (GifByteType *)malloc(ep->ByteCount = Len)) == NULL)
+ return(GIF_ERROR);
+
+ if (ExtData)
+ memcpy(ep->Bytes, ExtData, Len);
+
+ return(GIF_OK);
+}
+
+void CGIFFF FreeExtension(CGIFFF SavedImage *Image)
+{
+ ExtensionBlock *ep;
+
+ 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 *
+******************************************************************************/
+CGIFFF SavedImage *CGIFFF MakeSavedImage(CGIFFF GifFileType *GifFile, CGIFFF SavedImage *CopyFrom)
+/*
+ * Append an image block to the SavedImages array
+ */
+{
+ 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);
+
+ /* next, the raster */
+ sp->RasterBits = (GifPixelType *)malloc(sizeof(GifPixelType)
+ * CopyFrom->ImageDesc.Height
+ * CopyFrom->ImageDesc.Width);
+ 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);
+ 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.
+ */
+ }
+ }
+
+ return(sp);
+ }
+}
+
+void CGIFFF FreeSavedImages(CGIFFF GifFileType *GifFile)
+{
+ SavedImage *sp;
+
+ for (sp = GifFile->SavedImages;
+ sp < GifFile->SavedImages + GifFile->ImageCount;
+ sp++)
+ {
+ if (sp->ImageDesc.ColorMap)
+ FreeMapObject(sp->ImageDesc.ColorMap);
+
+ if (sp->RasterBits)
+ free((char *)sp->RasterBits);
+
+ if (sp->ExtensionBlocks)
+ FreeExtension(sp);
+ }
+ free((char *) GifFile->SavedImages);
+}
+
+/* --- dgif_lib.c */
+
+#define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */
+
+/* #define PROGRAM_NAME "GIFLIB" */
+
+#define COMMENT_EXT_FUNC_CODE 0xfe /* Extension function code for comment. */
+#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 LZ_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
+#define LZ_BITS 12
+
+#define FILE_STATE_READ 0x01/* 1 write, 0 read - EGIF_LIB compatible.*/
+
+#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 IS_READABLE(Private) (!(Private->FileState & FILE_STATE_READ))
+
+typedef struct GifFilePrivateType {
+ int FileState,
+ /*FileHandle,*/ /* Where all this data goes to! */
+ BitsPerPixel, /* Bits per pixel (Codes uses at list 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. */
+ CGIFFF GifByteType Buf[256]; /* Compressed input is buffered here. */
+ CGIFFF GifByteType Stack[LZ_MAX_CODE]; /* Decoded pixels are stacked here. */
+ CGIFFF GifByteType Suffix[LZ_MAX_CODE+1]; /* So we can trace the codes. */
+ unsigned int Prefix[LZ_MAX_CODE+1];
+} GifFilePrivateType;
+
+/* extern int _GifError; */
+
+static int DGifGetWord(FILE *File, int *Word);
+static int DGifSetupDecompress(CGIFFF GifFileType *GifFile);
+static int DGifDecompressLine(CGIFFF GifFileType *GifFile, CGIFFF GifPixelType *Line,
+ int LineLen);
+static int DGifGetPrefixChar(unsigned int *Prefix, int Code, int ClearCode);
+static int DGifDecompressInput(GifFilePrivateType *Private, int *Code);
+static int DGifBufferedInput(FILE *File, CGIFFF GifByteType *Buf,
+ CGIFFF GifByteType *NextByte);
+
+/******************************************************************************
+* 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. *
+******************************************************************************/
+CGIFFF GifFileType *CGIFFF DGifOpenFileName(const char *FileName) {
+#if 0 /**** pts ****/
+CGIFFF GifFileType *CGIFFF DGifOpenFileName(const char *FileName)
+{
+ int FileHandle;
+
+ if ((FileHandle = open(FileName, O_RDONLY
+#ifdef __MSDOS__
+ | O_BINARY
+#endif /* __MSDOS__ */
+ )) == -1) {
+ _GifError = D_GIF_ERR_OPEN_FAILED;
+ return NULL;
+ }
+
+ return DGifOpenFileHandle(FileHandle);
+#else
+ FILE *f;
+ if (NULL==(f=fopen(FileName,"rb"))) { _GifError=D_GIF_ERR_OPEN_FAILED; return NULL; }
+ return DGifOpenFILE(f);
+#endif
+}
+
+#if USE_CGIF_FDOPEN
+
+/******************************************************************************
+* 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. *
+******************************************************************************/
+CGIFFF GifFileType *CGIFFF DGifOpenFileHandle(int FileHandle)
+{
+ FILE *f;
+
+#ifdef __MSDOS__
+ setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */
+ f = fdopen(FileHandle, "rb"); /* Make it into a stream: */
+ setvbuf(f, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE);/* And inc. stream buffer.*/
+#else
+ f = fdopen(FileHandle, "rb"); /* Make it into a stream: */
+#endif /* __MSDOS__ */
+ return DGifOpenFILE(f);
+}
+#endif
+
+/**** pts ****/
+CGIFFF GifFileType *CGIFFF DGifOpenFILE(void/*FILE*/ *f) {
+ char Buf[GIF_STAMP_LEN+1];
+ GifFileType *GifFile;
+ GifFilePrivateType *Private;
+ if ((GifFile = (GifFileType *) malloc(sizeof(GifFileType))) == NULL) {
+ _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+
+ memset(GifFile, '\0', sizeof(GifFileType));
+
+ if ((Private = (GifFilePrivateType *) malloc(sizeof(GifFilePrivateType)))
+ == NULL) {
+ _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
+ free((char *) GifFile);
+ return NULL;
+ }
+ GifFile->Private = (VoidPtr) Private;
+ /* Private->FileHandle = FileHandle; */
+ Private->File = (FILE*)f;
+ Private->FileState = 0; /* Make sure bit 0 = 0 (File open for read). */
+
+ /* Let's see if this is a GIF file: */
+ if (fread(Buf, 1, GIF_STAMP_LEN, Private->File) != 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 CGIFFF DGifGetScreenDesc(CGIFFF 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(Private->File, &GifFile->SWidth) == GIF_ERROR ||
+ DGifGetWord(Private->File, &GifFile->SHeight) == GIF_ERROR)
+ return GIF_ERROR;
+
+ if (fread(Buf, 1, 3, Private->File) != 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];
+ // fprintf(stderr, "colres=%d bpp=%d bgcol=%d\n", GifFile->SColorResolution, BitsPerPixel, GifFile->SBackGroundColor);
+ if (Buf[0] & 0x80) { /* Do we have global color map? */
+ // fprintf(stderr, "have gcolormap\n");
+ GifFile->SColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
+
+ /* Get the global color map: */
+ for (i = 0; i < GifFile->SColorMap->ColorCount; i++) {
+ if (fread(Buf, 1, 3, Private->File) != 3) {
+ _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];
+ }
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+* This routine should be called before any attemp to read an image. *
+******************************************************************************/
+int CGIFFF DGifGetRecordType(CGIFFF GifFileType *GifFile, CGIFFF 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 (fread(&Buf, 1, 1, Private->File) != 1) {
+ _GifError = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+
+ // fprintf(stderr, "record %d at offset %ld\n", Buf&255, ftell(Private->File));
+ 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;
+ // fprintf(stderr, "wrong record %d at offset %ld\n", Buf&255, ftell(Private->File));
+ _GifError = D_GIF_ERR_WRONG_RECORD;
+ return GIF_ERROR;
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+* This routine should be called before any attemp to read an image. *
+* Note it is assumed the Image desc. header (',') has been read. *
+******************************************************************************/
+int CGIFFF DGifGetImageDesc(CGIFFF GifFileType *GifFile)
+{
+ int i, BitsPerPixel;
+ GifByteType Buf[3];
+ GifImageDesc Image;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+ memset(&Image, 0, sizeof(Image));
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ _GifError = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (DGifGetWord(Private->File, &Image.Left) == GIF_ERROR ||
+ DGifGetWord(Private->File, &Image.Top) == GIF_ERROR ||
+ DGifGetWord(Private->File, &Image.Width) == GIF_ERROR ||
+ DGifGetWord(Private->File, &Image.Height) == GIF_ERROR)
+ return GIF_ERROR;
+ if (fread(Buf, 1, 1, Private->File) != 1) {
+ _GifError = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ BitsPerPixel = (Buf[0] & 0x07) + 1;
+ Image.Interlace = (Buf[0] & 0x40);
+ if (Buf[0] & 0x80) { /* Does this image have local color map? */
+
+ if (Image.ColorMap && GifFile->SavedImages == NULL)
+ FreeMapObject(Image.ColorMap);
+
+ Image.ColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
+
+ /* Get the image local color map: */
+ for (i = 0; i < Image.ColorMap->ColorCount; i++) {
+ if (fread(Buf, 1, 3, Private->File) != 3) {
+ _GifError = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ Image.ColorMap->Colors[i].Red = Buf[0];
+ Image.ColorMap->Colors[i].Green = Buf[1];
+ Image.ColorMap->Colors[i].Blue = Buf[2];
+ }
+ }
+
+ /**** pts ****/
+ if (NULL!=GifFile->SavedImages) {
+ GifFile->SavedImages = (SavedImage *)realloc(GifFile->SavedImages,
+ sizeof(SavedImage) * (GifFile->ImageCount + 1));
+ } else {
+ assert(GifFile->ImageCount==0);
+ GifFile->SavedImages = (SavedImage *)malloc(sizeof(SavedImage));
+ }
+ if (NULL==GifFile->SavedImages) {
+ _GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+
+ {
+ SavedImage *sp;
+ sp = &GifFile->SavedImages[GifFile->ImageCount];
+ memcpy(&sp->ImageDesc, &Image, sizeof(GifImageDesc));
+ sp->RasterBits = (GifPixelType *)NULL;
+ sp->ExtensionBlockCount = 0;
+ sp->ExtensionBlocks = (ExtensionBlock *)NULL;
+ sp->delay=0;
+ sp->dispose=0;
+ sp->iter=1;
+ sp->transp=(-1);
+ }
+
+ GifFile->ImageCount++;
+
+ Private->PixelCount = (long) Image.Width *
+ (long) Image.Height;
+
+ DGifSetupDecompress(GifFile); /* Reset decompress algorithm parameters. */
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+* Get one full scanned line (Line) of length LineLen from GIF file. *
+******************************************************************************/
+int CGIFFF DGifGetLine(CGIFFF GifFileType *GifFile, CGIFFF 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;
+ }
+
+ /**** pts ****/
+ /* if (!LineLen) LineLen = GifFile->Image.Width; */
+
+#if defined(__MSDOS__) || 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 CGIFFF DGifGetPixel(CGIFFF GifFileType *GifFile, CGIFFF 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(__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 shouldbe 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 CGIFFF DGifGetExtension(CGIFFF GifFileType *GifFile, int *ExtCode,
+ CGIFFF 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 (fread(&Buf, 1, 1, Private->File) != 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 sould be called until NULL Extension is returned. *
+* The Extension should NOT be freed by the user (not dynamically allocated).*
+******************************************************************************/
+int CGIFFF DGifGetExtensionNext(CGIFFF GifFileType *GifFile, CGIFFF GifByteType **Extension)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ if (fread(&Buf, 1, 1, Private->File) != 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 (fread(&((*Extension)[1]), 1, Buf, Private->File) != 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 CGIFFF DGifCloseFile(CGIFFF 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 0 /**** pts ****/
+ if (GifFile->Image.ColorMap)
+ FreeMapObject(GifFile->Image.ColorMap);
+ #endif
+ if (GifFile->SColorMap)
+ FreeMapObject(GifFile->SColorMap);
+ if (Private)
+ free((char *) Private);
+ if (GifFile->SavedImages)
+ FreeSavedImages(GifFile);
+ free(GifFile);
+
+#if 0 /**** pts ****/
+ if (fclose(File) != 0) {
+ _GifError = D_GIF_ERR_CLOSE_FAILED;
+ return GIF_ERROR;
+ }
+#endif
+ return GIF_OK;
+}
+
+/******************************************************************************
+* Get 2 bytes (word) from the given file: *
+******************************************************************************/
+static int DGifGetWord(FILE *File, int *Word)
+{
+ unsigned char c[2];
+
+ if (fread(c, 1, 2, File) != 2) {
+ CGIFFF _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. his 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 CGIFFF DGifGetCode(CGIFFF GifFileType *GifFile, int *CodeSize, CGIFFF 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 CGIFFF DGifGetCodeNext(CGIFFF GifFileType *GifFile, CGIFFF GifByteType **CodeBlock)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ if (fread(&Buf, 1, 1, Private->File) != 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 (fread(&((*CodeBlock)[1]), 1, Buf, Private->File) != 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(CGIFFF GifFileType *GifFile)
+{
+ int i, BitsPerPixel;
+ CGIFFF GifByteType CodeSize;
+ unsigned int *Prefix;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ fread(&CodeSize, 1, 1, Private->File); /* 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(CGIFFF GifFileType *GifFile, CGIFFF GifPixelType *Line,
+ int LineLen)
+{
+ int i = 0, j, CrntCode, EOFCode, ClearCode, CrntPrefix, LastCode, StackPtr;
+ CGIFFF GifByteType *Stack, *Suffix;
+ unsigned int *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 != 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(Private, &CrntCode) == GIF_ERROR)
+ return GIF_ERROR;
+
+ /*fprintf(stderr,"CrntCode=0x%x\n",CrntCode);*/
+ 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) {
+ CGIFFF _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 {
+ CGIFFF _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) {
+ CGIFFF _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(unsigned int *Prefix, int Code, int ClearCode)
+{
+ int i = 0;
+
+ while (Code > ClearCode && i++ <= LZ_MAX_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 CGIFFF DGifGetLZCodes(CGIFFF 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(Private, 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(GifFilePrivateType *Private, int *Code)
+{
+ CGIFFF GifByteType NextByte;
+ static unsigned int CodeMasks[] = {
+ 0x0000, 0x0001, 0x0003, 0x0007,
+ 0x000f, 0x001f, 0x003f, 0x007f,
+ 0x00ff, 0x01ff, 0x03ff, 0x07ff,
+ 0x0fff
+ };
+
+ while (Private->CrntShiftState < Private->RunningBits) {
+ /* Needs to get more bytes from input stream for next code: */
+ if (DGifBufferedInput(Private->File, 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 cannt fit into RunningBits bits, must raise its size. Note */
+ /* however that codes above 4095 are used for special signaling. */
+ if (++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(FILE *File, CGIFFF GifByteType *Buf,
+ CGIFFF GifByteType *NextByte)
+{
+ if (Buf[0] == 0) {
+ /* Needs to read the next buffer - this one is empty: */
+ if (fread(Buf, 1, 1, File) != 1)
+ {
+ CGIFFF _GifError = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ if (fread(&Buf[1], 1, Buf[0], File) != Buf[0])
+ {
+ CGIFFF _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;
+}
+
+/******************************************************************************
+* 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 CGIFFF DGifSlurp(CGIFFF GifFileType *GifFile)
+{
+ static unsigned InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
+ InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
+ /**** pts: unused vars ****/
+ /* int i, j, Error, ImageSize; */
+ char eatit;
+ int ext_code;
+
+ GifRecordType RecordType;
+ /**** pts ****/
+ SavedImage *sp=0; /**** pts: avoid gcc warning */
+ /** Extension info of next SavedImage */
+ SavedImage ext;
+ /** No-extension info */
+ SavedImage noext;
+
+ GifByteType *ExtData;
+
+ /**** pts ****/
+ memset(&noext, 0, sizeof(noext));
+ noext.delay=0;
+ noext.dispose=0;
+ noext.iter=1;
+ noext.transp=(-1);
+ noext.ExtensionBlocks=NULL;
+ noext.ExtensionBlockCount=0;
+ ext=noext;
+
+ /**** pts ****/
+ GifFile->SavedImages=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);
+
+ /**** pts: DGifGetImageDesc has already allocated the mem ****/
+ sp = &GifFile->SavedImages[GifFile->ImageCount-1];
+ /**** pts: apply extensions to the image just read */
+ ext.RasterBits=sp->RasterBits;
+ ext.ImageDesc=sp->ImageDesc;
+ *sp=ext;
+ ext=noext;
+
+ /**** pts ****/
+ sp->RasterBits = (GifPixelType*) malloc((0L+sp->ImageDesc.Width) * sp->ImageDesc.Height * sizeof(GifPixelType));
+ if (sp->RasterBits==NULL) { _GifError=D_GIF_ERR_NOT_ENOUGH_MEM; return GIF_ERROR; }
+ if (sp->ImageDesc.Interlace) {
+ unsigned i, j, Height=sp->ImageDesc.Height, Width=sp->ImageDesc.Width;
+ /* Need to perform 4 passes on the images: */
+ for (i = 0; i < 4; i++)
+ for (j = InterlacedOffset[i]; j < Height; j += InterlacedJumps[i])
+ if (DGifGetLine(GifFile, sp->RasterBits+Width*j, Width) != GIF_OK) return GIF_ERROR;
+ } else {
+ if (DGifGetLine(GifFile, sp->RasterBits, (0L+sp->ImageDesc.Width) * sp->ImageDesc.Height)
+ == GIF_ERROR)
+ return(GIF_ERROR);
+ }
+ break;
+
+ case EXTENSION_RECORD_TYPE:
+
+ if (DGifGetExtension(GifFile,&ext_code,&ExtData)==GIF_ERROR)
+ return(GIF_ERROR);
+ if (ExtData!=NULL) {
+ #if 0 /**** pts ****/
+ ep = &ext.ExtensionBlocks[ext.ExtensionBlockCount++];
+ ep->ByteCount = ExtData[0];
+ ep->Bytes = (GifByteType *)malloc(ep->ByteCount * sizeof(GifByteType));
+ memcpy(ep->Bytes, ExtData, ep->ByteCount * sizeof(char));
+ #else
+ /**** pts ****/
+ eatit=0;
+ if (0xf9==(unsigned char)(ext_code)) {
+ assert(ExtData[0]>=4);
+ ext.dispose=ExtData[1]>>2;
+ ext.delay=(ExtData[3] << 8) | ExtData[2];
+ if ((ExtData[1] & 0x01) == 1) ext.transp=ExtData[4];
+ eatit=1; /* Eat this extension. */
+ } else if (0xff==(unsigned char)(ext_code)) {
+ assert(ExtData[0]>=3);
+ ext.iter=(ExtData[3] << 8) | ExtData[2];
+ eatit=1; /* Eat this extension. */
+ } else {
+ AddExtensionBlock(&ext, ExtData[0], ExtData+1);
+ ext.ExtensionBlocks[ext.ExtensionBlockCount-1].code=ext_code;
+ }
+ #endif
+ while (1) {
+ if (DGifGetExtensionNext(GifFile, &ExtData) == GIF_ERROR)
+ return(GIF_ERROR);
+ #if 0 /**** pts ****/
+ ep = &ext.ExtensionBlocks[ext.ExtensionBlockCount++];
+ ep->ByteCount = ExtData[0];
+ ep->Bytes = (GifByteType *)malloc(ep->ByteCount * sizeof(GifByteType));
+ memcpy(ep->Bytes,ExtData,ep->ByteCount * sizeof(char));
+ #else
+ if (ExtData==NULL) break;
+ AddExtensionBlock(sp, ExtData[0], ExtData+1);
+ #endif
+ }
+ }
+ break;
+
+ case TERMINATE_RECORD_TYPE:
+ break;
+
+ default: /* Should be trapped by DGifGetRecordType */
+ break;
+ }
+ }
+ while
+ (RecordType != TERMINATE_RECORD_TYPE);
+
+ return(GIF_OK);
+}
+
+/* __END__ */