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Diffstat (limited to 'Build/source/utils/sam2p/cgif.c')
-rw-r--r-- | Build/source/utils/sam2p/cgif.c | 1572 |
1 files changed, 1572 insertions, 0 deletions
diff --git a/Build/source/utils/sam2p/cgif.c b/Build/source/utils/sam2p/cgif.c new file mode 100644 index 00000000000..45f817b58c3 --- /dev/null +++ b/Build/source/utils/sam2p/cgif.c @@ -0,0 +1,1572 @@ +/* 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__ */ |