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-rw-r--r--Build/source/utils/sam2p/cgif.c1572
1 files changed, 0 insertions, 1572 deletions
diff --git a/Build/source/utils/sam2p/cgif.c b/Build/source/utils/sam2p/cgif.c
deleted file mode 100644
index 45f817b58c3..00000000000
--- a/Build/source/utils/sam2p/cgif.c
+++ /dev/null
@@ -1,1572 +0,0 @@
-/* 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__ */