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Diffstat (limited to 'egif_lib.c')
| -rw-r--r-- | egif_lib.c | 1111 |
1 files changed, 0 insertions, 1111 deletions
diff --git a/egif_lib.c b/egif_lib.c deleted file mode 100644 index d05d1c9..0000000 --- a/egif_lib.c +++ /dev/null @@ -1,1111 +0,0 @@ -/****************************************************************************** - * "Gif-Lib" - Yet another gif library. - * - * Written by: Gershon Elber Ver 1.1, Aug. 1990 - ****************************************************************************** - * The kernel of the GIF Encoding process can be found here. - ****************************************************************************** - * History: - * 14 Jun 89 - Version 1.0 by Gershon Elber. - * 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names). - * 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support) - *****************************************************************************/ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -/* Find a thirty-two bit int type */ -#ifdef HAVE_SYS_TYPES_H -#include <sys/types.h> -#endif -#ifdef HAVE_STDINT_H -#include <stdint.h> -#endif -#ifdef HAVE_UNISTD_H -#include <unistd.h> -#endif -#ifdef HAVE_INTTYPES_H -#include <inttypes.h> -#endif - -#ifdef __MSDOS__ -#include <io.h> -#include <alloc.h> -#include <sys\stat.h> -#else -#include <sys/types.h> -#include <sys/stat.h> -#ifdef R6000 - -/* FIXME: What is sys/mode.h? Can we substitute a check for this file rather - * than a check based on machine type? - */ -#include <sys/mode.h> -#endif -#endif /* __MSDOS__ */ - -#ifdef HAVE_IO_H -#include <io.h> -#endif - -#ifdef HAVE_FCNTL_H -#include <fcntl.h> -#endif /* HAVE_FCNTL_H */ -#ifdef HAVE_UNISTD_H -#include <unistd.h> -#endif /* HAVE_UNISTD_H */ -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include "gif_lib.h" -#include "gif_lib_private.h" - -/* #define DEBUG_NO_PREFIX Dump only compressed data. */ - -/* Masks given codes to BitsPerPixel, to make sure all codes are in range: */ -static GifPixelType CodeMask[] = { - 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff -}; - -static char GifVersionPrefix[GIF_STAMP_LEN + 1] = GIF87_STAMP; - -#define WRITE(_gif,_buf,_len) \ - (((GifFilePrivateType*)_gif->Private)->Write ? \ - ((GifFilePrivateType*)_gif->Private)->Write(_gif,_buf,_len) : \ - fwrite(_buf, 1, _len, ((GifFilePrivateType*)_gif->Private)->File)) - -static int EGifPutWord(int Word, GifFileType * GifFile); -static int EGifSetupCompress(GifFileType * GifFile); -static int EGifCompressLine(GifFileType * GifFile, GifPixelType * Line, - int LineLen); -static int EGifCompressOutput(GifFileType * GifFile, int Code); -static int EGifBufferedOutput(GifFileType * GifFile, GifByteType * Buf, - int c); - -/****************************************************************************** - * Open a new gif file for write, given by its name. If TestExistance then - * if the file exists this routines fails (returns NULL). - * Returns GifFileType pointer dynamically allocated which serves as the gif - * info record. _GifError is cleared if succesfull. - *****************************************************************************/ -GifFileType * -EGifOpenFileName(const char *FileName, - int TestExistance) { - - int FileHandle; - GifFileType *GifFile; - - if (TestExistance) - FileHandle = open(FileName, O_WRONLY | O_CREAT | O_EXCL -#if defined(__MSDOS__) || defined(WINDOWS32) || defined(_OPEN_BINARY) - | O_BINARY -#endif /* __MSDOS__ */ - , S_IREAD | S_IWRITE); - else - FileHandle = open(FileName, O_WRONLY | O_CREAT | O_TRUNC -#if defined(__MSDOS__) || defined(WINDOWS32) || defined(_OPEN_BINARY) - | O_BINARY -#endif /* __MSDOS__ */ - , S_IREAD | S_IWRITE); - - if (FileHandle == -1) { - _GifError = E_GIF_ERR_OPEN_FAILED; - return NULL; - } - GifFile = EGifOpenFileHandle(FileHandle); - if (GifFile == (GifFileType *) NULL) - close(FileHandle); - return GifFile; -} - -/****************************************************************************** - * Update a new gif file, given its file handle, which must be opened for - * write in binary mode. - * Returns GifFileType pointer dynamically allocated which serves as the gif - * info record. _GifError is cleared if succesfull. - *****************************************************************************/ -GifFileType * -EGifOpenFileHandle(int FileHandle) { - - GifFileType *GifFile; - GifFilePrivateType *Private; - FILE *f; - - GifFile = (GifFileType *) malloc(sizeof(GifFileType)); - if (GifFile == NULL) { - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return NULL; - } - - memset(GifFile, '\0', sizeof(GifFileType)); - - Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType)); - if (Private == NULL) { - free(GifFile); - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return NULL; - } - if ((Private->HashTable = _InitHashTable()) == NULL) { - free(GifFile); - free(Private); - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return NULL; - } - -#if defined(__MSDOS__) || defined(WINDOWS32) || defined(_OPEN_BINARY) - setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */ -#endif /* __MSDOS__ */ - - f = fdopen(FileHandle, "wb"); /* Make it into a stream: */ - -#if defined (__MSDOS__) || defined(WINDOWS32) - setvbuf(f, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE); /* And inc. stream - * buffer. */ -#endif /* __MSDOS__ */ - - GifFile->Private = (VoidPtr)Private; - Private->FileHandle = FileHandle; - Private->File = f; - Private->FileState = FILE_STATE_WRITE; - - Private->Write = (OutputFunc) 0; /* No user write routine (MRB) */ - GifFile->UserData = (VoidPtr) 0; /* No user write handle (MRB) */ - - _GifError = 0; - - return GifFile; -} - -/****************************************************************************** - * Output constructor that takes user supplied output function. - * Basically just a copy of EGifOpenFileHandle. (MRB) - *****************************************************************************/ -GifFileType * -EGifOpen(void *userData, - OutputFunc writeFunc) { - - GifFileType *GifFile; - GifFilePrivateType *Private; - - GifFile = (GifFileType *)malloc(sizeof(GifFileType)); - if (GifFile == NULL) { - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return NULL; - } - - memset(GifFile, '\0', sizeof(GifFileType)); - - Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType)); - if (Private == NULL) { - free(GifFile); - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return NULL; - } - - Private->HashTable = _InitHashTable(); - if (Private->HashTable == NULL) { - free (GifFile); - free (Private); - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return NULL; - } - - GifFile->Private = (VoidPtr) Private; - Private->FileHandle = 0; - Private->File = (FILE *) 0; - Private->FileState = FILE_STATE_WRITE; - - Private->Write = writeFunc; /* User write routine (MRB) */ - GifFile->UserData = userData; /* User write handle (MRB) */ - - _GifError = 0; - - return GifFile; -} - -/****************************************************************************** - * Routine to set current GIF version. All files open for write will be - * using this version until next call to this routine. Version consists of - * 3 characters as "87a" or "89a". No test is made to validate the version. - *****************************************************************************/ -void -EGifSetGifVersion(const char *Version) { - strncpy(GifVersionPrefix + GIF_VERSION_POS, Version, 3); -} - -/****************************************************************************** - * This routine should be called before any other EGif calls, immediately - * follows the GIF file openning. - *****************************************************************************/ -int -EGifPutScreenDesc(GifFileType * GifFile, - int Width, - int Height, - int ColorRes, - int BackGround, - const ColorMapObject * ColorMap) { - - int i; - GifByteType Buf[3]; - GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; - - if (Private->FileState & FILE_STATE_SCREEN) { - /* If already has screen descriptor - something is wrong! */ - _GifError = E_GIF_ERR_HAS_SCRN_DSCR; - return GIF_ERROR; - } - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - -/* First write the version prefix into the file. */ -#ifndef DEBUG_NO_PREFIX - if (WRITE(GifFile, (unsigned char *)GifVersionPrefix, - strlen(GifVersionPrefix)) != strlen(GifVersionPrefix)) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } -#endif /* DEBUG_NO_PREFIX */ - - GifFile->SWidth = Width; - GifFile->SHeight = Height; - GifFile->SColorResolution = ColorRes; - GifFile->SBackGroundColor = BackGround; - if (ColorMap) { - GifFile->SColorMap = MakeMapObject(ColorMap->ColorCount, - ColorMap->Colors); - if (GifFile->SColorMap == NULL) { - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return GIF_ERROR; - } - } else - GifFile->SColorMap = NULL; - - /* - * Put the logical screen descriptor into the file: - */ - /* Logical Screen Descriptor: Dimensions */ - EGifPutWord(Width, GifFile); - EGifPutWord(Height, GifFile); - - /* Logical Screen Descriptor: Packed Fields */ - /* Note: We have actual size of the color table default to the largest - * possible size (7+1 == 8 bits) because the decoder can use it to decide - * how to display the files. - */ - Buf[0] = (ColorMap ? 0x80 : 0x00) | /* Yes/no global colormap */ - ((ColorRes - 1) << 4) | /* Bits allocated to each primary color */ - (ColorMap ? ColorMap->BitsPerPixel - 1 : 0x07 ); /* Actual size of the - color table. */ - Buf[1] = BackGround; /* Index into the ColorTable for background color */ - Buf[2] = 0; /* Pixel Aspect Ratio */ -#ifndef DEBUG_NO_PREFIX - WRITE(GifFile, Buf, 3); -#endif /* DEBUG_NO_PREFIX */ - - /* If we have Global color map - dump it also: */ -#ifndef DEBUG_NO_PREFIX - if (ColorMap != NULL) - for (i = 0; i < ColorMap->ColorCount; i++) { - /* Put the ColorMap out also: */ - Buf[0] = ColorMap->Colors[i].Red; - Buf[1] = ColorMap->Colors[i].Green; - Buf[2] = ColorMap->Colors[i].Blue; - if (WRITE(GifFile, Buf, 3) != 3) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - } -#endif /* DEBUG_NO_PREFIX */ - - /* Mark this file as has screen descriptor, and no pixel written yet: */ - Private->FileState |= FILE_STATE_SCREEN; - - return GIF_OK; -} - -/****************************************************************************** - * This routine should be called before any attempt to dump an image - any - * call to any of the pixel dump routines. - *****************************************************************************/ -int -EGifPutImageDesc(GifFileType * GifFile, - int Left, - int Top, - int Width, - int Height, - int Interlace, - const ColorMapObject * ColorMap) { - - int i; - GifByteType Buf[3]; - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (Private->FileState & FILE_STATE_IMAGE && -#if defined(__MSDOS__) || defined(WINDOWS32) || defined(__GNUC__) - Private->PixelCount > 0xffff0000UL) { -#else - Private->PixelCount > 0xffff0000) { -#endif /* __MSDOS__ */ - /* If already has active image descriptor - something is wrong! */ - _GifError = E_GIF_ERR_HAS_IMAG_DSCR; - return GIF_ERROR; - } - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - GifFile->Image.Left = Left; - GifFile->Image.Top = Top; - GifFile->Image.Width = Width; - GifFile->Image.Height = Height; - GifFile->Image.Interlace = Interlace; - if (ColorMap) { - GifFile->Image.ColorMap = MakeMapObject(ColorMap->ColorCount, - ColorMap->Colors); - if (GifFile->Image.ColorMap == NULL) { - _GifError = E_GIF_ERR_NOT_ENOUGH_MEM; - return GIF_ERROR; - } - } else { - GifFile->Image.ColorMap = NULL; - } - - /* Put the image descriptor into the file: */ - Buf[0] = ','; /* Image seperator character. */ -#ifndef DEBUG_NO_PREFIX - WRITE(GifFile, Buf, 1); -#endif /* DEBUG_NO_PREFIX */ - EGifPutWord(Left, GifFile); - EGifPutWord(Top, GifFile); - EGifPutWord(Width, GifFile); - EGifPutWord(Height, GifFile); - Buf[0] = (ColorMap ? 0x80 : 0x00) | - (Interlace ? 0x40 : 0x00) | - (ColorMap ? ColorMap->BitsPerPixel - 1 : 0); -#ifndef DEBUG_NO_PREFIX - WRITE(GifFile, Buf, 1); -#endif /* DEBUG_NO_PREFIX */ - - /* If we have Global color map - dump it also: */ -#ifndef DEBUG_NO_PREFIX - if (ColorMap != NULL) - for (i = 0; i < ColorMap->ColorCount; i++) { - /* Put the ColorMap out also: */ - Buf[0] = ColorMap->Colors[i].Red; - Buf[1] = ColorMap->Colors[i].Green; - Buf[2] = ColorMap->Colors[i].Blue; - if (WRITE(GifFile, Buf, 3) != 3) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - } -#endif /* DEBUG_NO_PREFIX */ - if (GifFile->SColorMap == NULL && GifFile->Image.ColorMap == NULL) { - _GifError = E_GIF_ERR_NO_COLOR_MAP; - return GIF_ERROR; - } - - /* Mark this file as has screen descriptor: */ - Private->FileState |= FILE_STATE_IMAGE; - Private->PixelCount = (long)Width *(long)Height; - - EGifSetupCompress(GifFile); /* Reset compress algorithm parameters. */ - - return GIF_OK; -} - -/****************************************************************************** - * Put one full scanned line (Line) of length LineLen into GIF file. - *****************************************************************************/ -int -EGifPutLine(GifFileType * GifFile, - GifPixelType * Line, - int LineLen) { - - int i; - GifPixelType Mask; - GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - if (!LineLen) - LineLen = GifFile->Image.Width; - if (Private->PixelCount < (unsigned)LineLen) { - _GifError = E_GIF_ERR_DATA_TOO_BIG; - return GIF_ERROR; - } - Private->PixelCount -= LineLen; - - /* Make sure the codes are not out of bit range, as we might generate - * wrong code (because of overflow when we combine them) in this case: */ - Mask = CodeMask[Private->BitsPerPixel]; - for (i = 0; i < LineLen; i++) - Line[i] &= Mask; - - return EGifCompressLine(GifFile, Line, LineLen); -} - -/****************************************************************************** - * Put one pixel (Pixel) into GIF file. - *****************************************************************************/ -int -EGifPutPixel(GifFileType * GifFile, - GifPixelType Pixel) { - - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - if (Private->PixelCount == 0) { - _GifError = E_GIF_ERR_DATA_TOO_BIG; - return GIF_ERROR; - } - --Private->PixelCount; - - /* Make sure the code is not out of bit range, as we might generate - * wrong code (because of overflow when we combine them) in this case: */ - Pixel &= CodeMask[Private->BitsPerPixel]; - - return EGifCompressLine(GifFile, &Pixel, 1); -} - -/****************************************************************************** - * Put a comment into GIF file using the GIF89 comment extension block. - *****************************************************************************/ -int -EGifPutComment(GifFileType * GifFile, - const char *Comment) { - - unsigned int length = strlen(Comment); - char *buf; - - length = strlen(Comment); - if (length <= 255) { - return EGifPutExtension(GifFile, COMMENT_EXT_FUNC_CODE, - length, Comment); - } else { - buf = (char *)Comment; - if (EGifPutExtensionFirst(GifFile, COMMENT_EXT_FUNC_CODE, 255, buf) - == GIF_ERROR) { - return GIF_ERROR; - } - length -= 255; - buf = buf + 255; - - /* Break the comment into 255 byte sub blocks */ - while (length > 255) { - if (EGifPutExtensionNext(GifFile, 0, 255, buf) == GIF_ERROR) { - return GIF_ERROR; - } - buf = buf + 255; - length -= 255; - } - /* Output any partial block and the clear code. */ - if (length > 0) { - if (EGifPutExtensionLast(GifFile, 0, length, buf) == GIF_ERROR) { - return GIF_ERROR; - } - } else { - if (EGifPutExtensionLast(GifFile, 0, 0, NULL) == GIF_ERROR) { - return GIF_ERROR; - } - } - } - return GIF_OK; -} - -/****************************************************************************** - * Put a first extension block (see GIF manual) into gif file. Here more - * extensions can be dumped using EGifPutExtensionNext until - * EGifPutExtensionLast is invoked. - *****************************************************************************/ -int -EGifPutExtensionFirst(GifFileType * GifFile, - int ExtCode, - int ExtLen, - const VoidPtr Extension) { - - GifByteType Buf[3]; - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - if (ExtCode == 0) { - WRITE(GifFile, (GifByteType *)&ExtLen, 1); - } else { - Buf[0] = '!'; - Buf[1] = ExtCode; - Buf[2] = ExtLen; - WRITE(GifFile, Buf, 3); - } - - WRITE(GifFile, Extension, ExtLen); - - return GIF_OK; -} - -/****************************************************************************** - * Put a middle extension block (see GIF manual) into gif file. - *****************************************************************************/ -int -EGifPutExtensionNext(GifFileType * GifFile, - int ExtCode, - int ExtLen, - const VoidPtr Extension) { - - GifByteType Buf; - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - Buf = ExtLen; - WRITE(GifFile, &Buf, 1); - WRITE(GifFile, Extension, ExtLen); - - return GIF_OK; -} - -/****************************************************************************** - * Put a last extension block (see GIF manual) into gif file. - *****************************************************************************/ -int -EGifPutExtensionLast(GifFileType * GifFile, - int ExtCode, - int ExtLen, - const VoidPtr Extension) { - - GifByteType Buf; - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - /* If we are given an extension sub-block output it now. */ - if (ExtLen > 0) { - Buf = ExtLen; - WRITE(GifFile, &Buf, 1); - WRITE(GifFile, Extension, ExtLen); - } - - /* Write the block terminator */ - Buf = 0; - WRITE(GifFile, &Buf, 1); - - return GIF_OK; -} - -/****************************************************************************** - * Put an extension block (see GIF manual) into gif file. - * Warning: This function is only useful for Extension blocks that have at - * most one subblock. Extensions with more than one subblock need to use the - * EGifPutExtension{First,Next,Last} functions instead. - *****************************************************************************/ -int -EGifPutExtension(GifFileType * GifFile, - int ExtCode, - int ExtLen, - const VoidPtr Extension) { - - GifByteType Buf[3]; - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - if (ExtCode == 0) - WRITE(GifFile, (GifByteType *)&ExtLen, 1); - else { - Buf[0] = '!'; /* Extension Introducer 0x21 */ - Buf[1] = ExtCode; /* Extension Label */ - Buf[2] = ExtLen; /* Extension length */ - WRITE(GifFile, Buf, 3); - } - WRITE(GifFile, Extension, ExtLen); - Buf[0] = 0; - WRITE(GifFile, Buf, 1); - - return GIF_OK; -} - -/****************************************************************************** - * Put the image code in compressed form. This routine can be called if the - * information needed to be piped out as is. Obviously this is much faster - * than decoding and encoding again. This routine should be followed by calls - * to EGifPutCodeNext, until NULL block is given. - * The block should NOT be freed by the user (not dynamically allocated). - *****************************************************************************/ -int -EGifPutCode(GifFileType * GifFile, - int CodeSize, - const GifByteType * CodeBlock) { - - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - /* No need to dump code size as Compression set up does any for us: */ - /* - * Buf = CodeSize; - * if (WRITE(GifFile, &Buf, 1) != 1) { - * _GifError = E_GIF_ERR_WRITE_FAILED; - * return GIF_ERROR; - * } - */ - - return EGifPutCodeNext(GifFile, CodeBlock); -} - -/****************************************************************************** - * Continue to put the image code in compressed form. This routine should be - * called with blocks of code as read via DGifGetCode/DGifGetCodeNext. If - * given buffer pointer is NULL, empty block is written to mark end of code. - *****************************************************************************/ -int -EGifPutCodeNext(GifFileType * GifFile, - const GifByteType * CodeBlock) { - - GifByteType Buf; - GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private; - - if (CodeBlock != NULL) { - if (WRITE(GifFile, CodeBlock, CodeBlock[0] + 1) - != (unsigned)(CodeBlock[0] + 1)) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - } else { - Buf = 0; - if (WRITE(GifFile, &Buf, 1) != 1) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - Private->PixelCount = 0; /* And local info. indicate image read. */ - } - - return GIF_OK; -} - -/****************************************************************************** - * This routine should be called last, to close GIF file. - *****************************************************************************/ -int -EGifCloseFile(GifFileType * GifFile) { - - GifByteType Buf; - GifFilePrivateType *Private; - FILE *File; - - if (GifFile == NULL) - return GIF_ERROR; - - Private = (GifFilePrivateType *) GifFile->Private; - if (!IS_WRITEABLE(Private)) { - /* This file was NOT open for writing: */ - _GifError = E_GIF_ERR_NOT_WRITEABLE; - return GIF_ERROR; - } - - File = Private->File; - - Buf = ';'; - WRITE(GifFile, &Buf, 1); - - if (GifFile->Image.ColorMap) { - FreeMapObject(GifFile->Image.ColorMap); - GifFile->Image.ColorMap = NULL; - } - if (GifFile->SColorMap) { - FreeMapObject(GifFile->SColorMap); - GifFile->SColorMap = NULL; - } - if (Private) { - if (Private->HashTable) { - free((char *) Private->HashTable); - } - free((char *) Private); - } - free(GifFile); - - if (File && fclose(File) != 0) { - _GifError = E_GIF_ERR_CLOSE_FAILED; - return GIF_ERROR; - } - return GIF_OK; -} - -/****************************************************************************** - * Put 2 bytes (word) into the given file: - *****************************************************************************/ -static int -EGifPutWord(int Word, - GifFileType * GifFile) { - - unsigned char c[2]; - - c[0] = Word & 0xff; - c[1] = (Word >> 8) & 0xff; -#ifndef DEBUG_NO_PREFIX - if (WRITE(GifFile, c, 2) == 2) - return GIF_OK; - else - return GIF_ERROR; -#else - return GIF_OK; -#endif /* DEBUG_NO_PREFIX */ -} - -/****************************************************************************** - * Setup the LZ compression for this image: - *****************************************************************************/ -static int -EGifSetupCompress(GifFileType * GifFile) { - - int BitsPerPixel; - GifByteType Buf; - GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; - - /* Test and see what color map to use, and from it # bits per pixel: */ - if (GifFile->Image.ColorMap) - BitsPerPixel = GifFile->Image.ColorMap->BitsPerPixel; - else if (GifFile->SColorMap) - BitsPerPixel = GifFile->SColorMap->BitsPerPixel; - else { - _GifError = E_GIF_ERR_NO_COLOR_MAP; - return GIF_ERROR; - } - - Buf = BitsPerPixel = (BitsPerPixel < 2 ? 2 : BitsPerPixel); - WRITE(GifFile, &Buf, 1); /* Write the Code size to file. */ - - Private->Buf[0] = 0; /* Nothing was output yet. */ - 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->CrntCode = FIRST_CODE; /* Signal that this is first one! */ - Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */ - Private->CrntShiftDWord = 0; - - /* Clear hash table and send Clear to make sure the decoder do the same. */ - _ClearHashTable(Private->HashTable); - - if (EGifCompressOutput(GifFile, Private->ClearCode) == GIF_ERROR) { - _GifError = E_GIF_ERR_DISK_IS_FULL; - return GIF_ERROR; - } - return GIF_OK; -} - -/****************************************************************************** - * The LZ compression routine: - * This version compresses the given buffer Line of length LineLen. - * This routine can be called a few times (one per scan line, for example), in - * order to complete the whole image. -******************************************************************************/ -static int -EGifCompressLine(GifFileType * GifFile, - GifPixelType * Line, - int LineLen) { - - int i = 0, CrntCode, NewCode; - unsigned long NewKey; - GifPixelType Pixel; - GifHashTableType *HashTable; - GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; - - HashTable = Private->HashTable; - - if (Private->CrntCode == FIRST_CODE) /* Its first time! */ - CrntCode = Line[i++]; - else - CrntCode = Private->CrntCode; /* Get last code in compression. */ - - while (i < LineLen) { /* Decode LineLen items. */ - Pixel = Line[i++]; /* Get next pixel from stream. */ - /* Form a new unique key to search hash table for the code combines - * CrntCode as Prefix string with Pixel as postfix char. - */ - NewKey = (((UINT32) CrntCode) << 8) + Pixel; - if ((NewCode = _ExistsHashTable(HashTable, NewKey)) >= 0) { - /* This Key is already there, or the string is old one, so - * simple take new code as our CrntCode: - */ - CrntCode = NewCode; - } else { - /* Put it in hash table, output the prefix code, and make our - * CrntCode equal to Pixel. - */ - if (EGifCompressOutput(GifFile, CrntCode) == GIF_ERROR) { - _GifError = E_GIF_ERR_DISK_IS_FULL; - return GIF_ERROR; - } - CrntCode = Pixel; - - /* If however the HashTable if full, we send a clear first and - * Clear the hash table. - */ - if (Private->RunningCode >= LZ_MAX_CODE) { - /* Time to do some clearance: */ - if (EGifCompressOutput(GifFile, Private->ClearCode) - == GIF_ERROR) { - _GifError = E_GIF_ERR_DISK_IS_FULL; - return GIF_ERROR; - } - Private->RunningCode = Private->EOFCode + 1; - Private->RunningBits = Private->BitsPerPixel + 1; - Private->MaxCode1 = 1 << Private->RunningBits; - _ClearHashTable(HashTable); - } else { - /* Put this unique key with its relative Code in hash table: */ - _InsertHashTable(HashTable, NewKey, Private->RunningCode++); - } - } - - } - - /* Preserve the current state of the compression algorithm: */ - Private->CrntCode = CrntCode; - - if (Private->PixelCount == 0) { - /* We are done - output last Code and flush output buffers: */ - if (EGifCompressOutput(GifFile, CrntCode) == GIF_ERROR) { - _GifError = E_GIF_ERR_DISK_IS_FULL; - return GIF_ERROR; - } - if (EGifCompressOutput(GifFile, Private->EOFCode) == GIF_ERROR) { - _GifError = E_GIF_ERR_DISK_IS_FULL; - return GIF_ERROR; - } - if (EGifCompressOutput(GifFile, FLUSH_OUTPUT) == GIF_ERROR) { - _GifError = E_GIF_ERR_DISK_IS_FULL; - return GIF_ERROR; - } - } - - return GIF_OK; -} - -/****************************************************************************** - * The LZ compression output routine: - * This routine is responsible for the compression of the bit stream into - * 8 bits (bytes) packets. - * Returns GIF_OK if written succesfully. - *****************************************************************************/ -static int -EGifCompressOutput(GifFileType * GifFile, - int Code) { - - GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private; - int retval = GIF_OK; - - if (Code == FLUSH_OUTPUT) { - while (Private->CrntShiftState > 0) { - /* Get Rid of what is left in DWord, and flush it. */ - if (EGifBufferedOutput(GifFile, Private->Buf, - Private->CrntShiftDWord & 0xff) == GIF_ERROR) - retval = GIF_ERROR; - Private->CrntShiftDWord >>= 8; - Private->CrntShiftState -= 8; - } - Private->CrntShiftState = 0; /* For next time. */ - if (EGifBufferedOutput(GifFile, Private->Buf, - FLUSH_OUTPUT) == GIF_ERROR) - retval = GIF_ERROR; - } else { - Private->CrntShiftDWord |= ((long)Code) << Private->CrntShiftState; - Private->CrntShiftState += Private->RunningBits; - while (Private->CrntShiftState >= 8) { - /* Dump out full bytes: */ - if (EGifBufferedOutput(GifFile, Private->Buf, - Private->CrntShiftDWord & 0xff) == GIF_ERROR) - retval = GIF_ERROR; - Private->CrntShiftDWord >>= 8; - Private->CrntShiftState -= 8; - } - } - - /* 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 && Code <= 4095) { - Private->MaxCode1 = 1 << ++Private->RunningBits; - } - - return retval; -} - -/****************************************************************************** - * This routines buffers the given characters until 255 characters are ready - * to be output. If Code is equal to -1 the buffer is flushed (EOF). - * The buffer is Dumped with first byte as its size, as GIF format requires. - * Returns GIF_OK if written succesfully. - *****************************************************************************/ -static int -EGifBufferedOutput(GifFileType * GifFile, - GifByteType * Buf, - int c) { - - if (c == FLUSH_OUTPUT) { - /* Flush everything out. */ - if (Buf[0] != 0 - && WRITE(GifFile, Buf, Buf[0] + 1) != (unsigned)(Buf[0] + 1)) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - /* Mark end of compressed data, by an empty block (see GIF doc): */ - Buf[0] = 0; - if (WRITE(GifFile, Buf, 1) != 1) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - } else { - if (Buf[0] == 255) { - /* Dump out this buffer - it is full: */ - if (WRITE(GifFile, Buf, Buf[0] + 1) != (unsigned)(Buf[0] + 1)) { - _GifError = E_GIF_ERR_WRITE_FAILED; - return GIF_ERROR; - } - Buf[0] = 0; - } - Buf[++Buf[0]] = c; - } - - return GIF_OK; -} - -/****************************************************************************** - * This routine writes to disk an in-core representation of a GIF previously - * created by DGifSlurp(). - *****************************************************************************/ -int -EGifSpew(GifFileType * GifFileOut) { - - int i, j, gif89 = FALSE; - int bOff; /* Block Offset for adding sub blocks in Extensions */ - char SavedStamp[GIF_STAMP_LEN + 1]; - - for (i = 0; i < GifFileOut->ImageCount; i++) { - for (j = 0; j < GifFileOut->SavedImages[i].ExtensionBlockCount; j++) { - int function = - GifFileOut->SavedImages[i].ExtensionBlocks[j].Function; - - if (function == COMMENT_EXT_FUNC_CODE - || function == GRAPHICS_EXT_FUNC_CODE - || function == PLAINTEXT_EXT_FUNC_CODE - || function == APPLICATION_EXT_FUNC_CODE) - gif89 = TRUE; - } - } - - strncpy(SavedStamp, GifVersionPrefix, GIF_STAMP_LEN); - if (gif89) { - strncpy(GifVersionPrefix, GIF89_STAMP, GIF_STAMP_LEN); - } else { - strncpy(GifVersionPrefix, GIF87_STAMP, GIF_STAMP_LEN); - } - if (EGifPutScreenDesc(GifFileOut, - GifFileOut->SWidth, - GifFileOut->SHeight, - GifFileOut->SColorResolution, - GifFileOut->SBackGroundColor, - GifFileOut->SColorMap) == GIF_ERROR) { - strncpy(GifVersionPrefix, SavedStamp, GIF_STAMP_LEN); - return (GIF_ERROR); - } - strncpy(GifVersionPrefix, SavedStamp, GIF_STAMP_LEN); - - for (i = 0; i < GifFileOut->ImageCount; i++) { - SavedImage *sp = &GifFileOut->SavedImages[i]; - int SavedHeight = sp->ImageDesc.Height; - int SavedWidth = sp->ImageDesc.Width; - ExtensionBlock *ep; - - /* this allows us to delete images by nuking their rasters */ - if (sp->RasterBits == NULL) - continue; - - if (sp->ExtensionBlocks) { - for (j = 0; j < sp->ExtensionBlockCount; j++) { - ep = &sp->ExtensionBlocks[j]; - if (j == sp->ExtensionBlockCount - 1 || (ep+1)->Function != 0) { - /*** FIXME: Must check whether outputting - * <ExtLen><Extension> is ever valid or if we should just - * drop anything with a 0 for the Function. (And whether - * we should drop here or in EGifPutExtension) - */ - if (EGifPutExtension(GifFileOut, - (ep->Function != 0) ? ep->Function : '\0', - ep->ByteCount, - ep->Bytes) == GIF_ERROR) { - return (GIF_ERROR); - } - } else { - EGifPutExtensionFirst(GifFileOut, ep->Function, ep->ByteCount, ep->Bytes); - for (bOff = j+1; bOff < sp->ExtensionBlockCount; bOff++) { - ep = &sp->ExtensionBlocks[bOff]; - if (ep->Function != 0) { - break; - } - EGifPutExtensionNext(GifFileOut, 0, - ep->ByteCount, ep->Bytes); - } - EGifPutExtensionLast(GifFileOut, 0, 0, NULL); - j = bOff-1; - } - } - } - - if (EGifPutImageDesc(GifFileOut, - sp->ImageDesc.Left, - sp->ImageDesc.Top, - SavedWidth, - SavedHeight, - sp->ImageDesc.Interlace, - sp->ImageDesc.ColorMap) == GIF_ERROR) - return (GIF_ERROR); - - for (j = 0; j < SavedHeight; j++) { - if (EGifPutLine(GifFileOut, - sp->RasterBits + j * SavedWidth, - SavedWidth) == GIF_ERROR) - return (GIF_ERROR); - } - } - - if (EGifCloseFile(GifFileOut) == GIF_ERROR) - return (GIF_ERROR); - - return (GIF_OK); -} |