467 lines
14 KiB
C
467 lines
14 KiB
C
/*****************************************************************************
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giftext - dump GIF pixels and metadata as text
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SPDX-License-Identifier: MIT
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*****************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#ifdef _WIN32
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#include <io.h>
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#endif /* _WIN32 */
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "giftext"
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#define MAKE_PRINTABLE(c) (isprint(c) ? (c) : ' ')
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static char
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*VersionStr =
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PROGRAM_NAME
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VERSION_COOKIE
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" Gershon Elber, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1989 Gershon Elber.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" v%- c%- e%- z%- p%- r%- h%- GifFile!*s";
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static void PrintCodeBlock(GifFileType *GifFile, GifByteType *CodeBlock, bool Reset);
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static void PrintPixelBlock(GifByteType *PixelBlock, int Len, bool Reset);
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static void PrintExtBlock(GifByteType *Extension, bool Reset);
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static void PrintLZCodes(GifFileType *GifFile);
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/******************************************************************************
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Interpret the command line and scan the given GIF file.
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******************************************************************************/
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int main(int argc, char **argv)
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{
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int i, j, ExtCode, ErrorCode, CodeSize, NumFiles, Len, ImageNum = 1;
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bool Error,
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ColorMapFlag = false, EncodedFlag = false, LZCodesFlag = false,
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PixelFlag = false, HelpFlag = false, RawFlag = false;
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char *GifFileName, **FileName = NULL;
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GifPixelType *Line;
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GifRecordType RecordType;
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GifByteType *CodeBlock, *Extension;
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GifFileType *GifFile;
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if ((Error = GAGetArgs(argc, argv, CtrlStr,
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&GifNoisyPrint, &ColorMapFlag, &EncodedFlag,
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&LZCodesFlag, &PixelFlag, &RawFlag, &HelpFlag,
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&NumFiles, &FileName)) != false ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (NumFiles > 1)
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GIF_MESSAGE("Error in command line parsing - one GIF file please.");
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GAPrintHowTo(CtrlStr);
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exit(EXIT_FAILURE);
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}
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if (HelpFlag) {
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(void)fprintf(stderr, VersionStr, GIFLIB_MAJOR, GIFLIB_MINOR);
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GAPrintHowTo(CtrlStr);
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exit(EXIT_SUCCESS);
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}
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if (NumFiles == 1) {
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GifFileName = *FileName;
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if ((GifFile = DGifOpenFileName(*FileName, &ErrorCode)) == NULL) {
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PrintGifError(ErrorCode);
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exit(EXIT_FAILURE);
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}
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}
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else {
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/* Use stdin instead: */
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GifFileName = "Stdin";
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if ((GifFile = DGifOpenFileHandle(0, &ErrorCode)) == NULL) {
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PrintGifError(ErrorCode);
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exit(EXIT_FAILURE);
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}
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}
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/* Because we write binary data - make sure no text will be written. */
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if (RawFlag) {
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ColorMapFlag = EncodedFlag = LZCodesFlag = PixelFlag = false;
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#ifdef _WIN32
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_setmode(1, O_BINARY); /* Make sure it is in binary mode. */
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#endif /* _WIN32 */
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}
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else {
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printf("\n%s:\n\n\tScreen Size - Width = %d, Height = %d.\n",
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GifFileName, GifFile->SWidth, GifFile->SHeight);
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printf("\tColorResolution = %d, BitsPerPixel = %d, BackGround = %d, Aspect = %d.\n",
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GifFile->SColorResolution,
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GifFile->SColorMap ? GifFile->SColorMap->BitsPerPixel : 0,
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GifFile->SBackGroundColor,
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GifFile->AspectByte);
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if (GifFile->SColorMap)
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printf("\tHas Global Color Map.\n\n");
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else
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printf("\tNo Global Color Map.\n\n");
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if (ColorMapFlag && GifFile->SColorMap) {
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printf("\tGlobal Color Map:\n");
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Len = GifFile->SColorMap->ColorCount;
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printf("\tSort Flag: %s\n",
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GifFile->SColorMap->SortFlag ? "on":"off");
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for (i = 0; i < Len; i+=4) {
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for (j = 0; j < 4 && j < Len; j++) {
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printf("%3d: %02xh %02xh %02xh ", i + j,
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GifFile->SColorMap->Colors[i + j].Red,
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GifFile->SColorMap->Colors[i + j].Green,
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GifFile->SColorMap->Colors[i + j].Blue);
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}
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printf("\n");
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}
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}
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}
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do {
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if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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switch (RecordType) {
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case IMAGE_DESC_RECORD_TYPE:
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if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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if (!RawFlag) {
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printf("\nImage #%d:\n\n\tImage Size - Left = %d, Top = %d, Width = %d, Height = %d.\n",
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ImageNum++, GifFile->Image.Left, GifFile->Image.Top,
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GifFile->Image.Width, GifFile->Image.Height);
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printf("\tImage is %s",
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GifFile->Image.Interlace ? "Interlaced" :
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"Non Interlaced");
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if (GifFile->Image.ColorMap != NULL)
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printf(", BitsPerPixel = %d.\n",
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GifFile->Image.ColorMap->BitsPerPixel);
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else
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printf(".\n");
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if (GifFile->Image.ColorMap)
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printf("\tImage Has Color Map.\n");
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else
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printf("\tNo Image Color Map.\n");
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if (ColorMapFlag && GifFile->Image.ColorMap) {
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printf("\tSort Flag: %s\n",
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GifFile->Image.ColorMap->SortFlag ? "on":"off");
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Len = 1 << GifFile->Image.ColorMap->BitsPerPixel;
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for (i = 0; i < Len; i+=4) {
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for (j = 0; j < 4 && j < Len; j++) {
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printf("%3d: %02xh %02xh %02xh ", i + j,
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GifFile->Image.ColorMap->Colors[i + j].Red,
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GifFile->Image.ColorMap->Colors[i + j].Green,
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GifFile->Image.ColorMap->Colors[i + j].Blue);
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}
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printf("\n");
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}
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}
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}
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if (EncodedFlag) {
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if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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printf("\nImage LZ compressed Codes (Code Size = %d):\n",
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CodeSize);
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PrintCodeBlock(GifFile, CodeBlock, true);
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while (CodeBlock != NULL) {
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if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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PrintCodeBlock(GifFile, CodeBlock, false);
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}
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}
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else if (LZCodesFlag) {
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PrintLZCodes(GifFile);
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}
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else if (PixelFlag) {
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Line = (GifPixelType *) malloc(GifFile->Image.Width *
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sizeof(GifPixelType));
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for (i = 0; i < GifFile->Image.Height; i++) {
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if (DGifGetLine(GifFile, Line, GifFile->Image.Width)
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== GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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PrintPixelBlock(Line, GifFile->Image.Width, i == 0);
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}
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PrintPixelBlock(NULL, GifFile->Image.Width, false);
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free((char *) Line);
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}
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else if (RawFlag) {
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Line = (GifPixelType *) malloc(GifFile->Image.Width *
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sizeof(GifPixelType));
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for (i = 0; i < GifFile->Image.Height; i++) {
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if (DGifGetLine(GifFile, Line, GifFile->Image.Width)
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== GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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fwrite(Line, 1, GifFile->Image.Width, stdout);
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}
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free((char *) Line);
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}
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else {
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/* Skip the image: */
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if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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while (CodeBlock != NULL) {
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if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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}
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}
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break;
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case EXTENSION_RECORD_TYPE:
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if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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if (!RawFlag) {
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putchar('\n');
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switch (ExtCode)
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{
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case COMMENT_EXT_FUNC_CODE:
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printf("GIF89 comment");
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break;
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case GRAPHICS_EXT_FUNC_CODE:
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printf("GIF89 graphics control");
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break;
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case PLAINTEXT_EXT_FUNC_CODE:
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printf("GIF89 plaintext");
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break;
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case APPLICATION_EXT_FUNC_CODE:
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printf("GIF89 application block");
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break;
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default:
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printf("Extension record of unknown type");
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break;
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}
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printf(" (Ext Code = %d [%c]):\n",
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ExtCode, MAKE_PRINTABLE(ExtCode));
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PrintExtBlock(Extension, true);
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if (ExtCode == GRAPHICS_EXT_FUNC_CODE) {
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GraphicsControlBlock gcb;
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if (Extension == NULL) {
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printf("Invalid extension block\n");
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GifFile->Error = D_GIF_ERR_IMAGE_DEFECT;
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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if (DGifExtensionToGCB(Extension[0], Extension+1, &gcb) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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printf("\tDisposal Mode: %d\n", gcb.DisposalMode);
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printf("\tUser Input Flag: %d\n", gcb.UserInputFlag);
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printf("\tTransparency on: %s\n",
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gcb.TransparentColor != -1 ? "yes" : "no");
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printf("\tDelayTime: %d\n", gcb.DelayTime);
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printf("\tTransparent Index: %d\n", gcb.TransparentColor);
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}
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}
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for (;;) {
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if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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if (Extension == NULL)
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break;
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PrintExtBlock(Extension, false);
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}
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break;
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case TERMINATE_RECORD_TYPE:
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break;
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default: /* Should be trapped by DGifGetRecordType */
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break;
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}
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}
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while (RecordType != TERMINATE_RECORD_TYPE);
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if (DGifCloseFile(GifFile, &ErrorCode) == GIF_ERROR) {
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PrintGifError(ErrorCode);
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exit(EXIT_FAILURE);
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}
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if (!RawFlag) printf("\nGIF file terminated normally.\n");
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return 0;
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}
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/******************************************************************************
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Print the given CodeBlock - a string in pascal notation (size in first
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place). Save local information so printing can be performed continuously,
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or reset to start state if Reset. If CodeBlock is NULL, output is flushed
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******************************************************************************/
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static void PrintCodeBlock(GifFileType *GifFile, GifByteType *CodeBlock, bool Reset)
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{
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static int CrntPlace = 0;
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static long CodeCount = 0;
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int i, Len;
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if (Reset || CodeBlock == NULL) {
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if (CodeBlock == NULL) {
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long NumBytes = 0;
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if (CrntPlace > 0) {
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printf("\n");
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CodeCount += CrntPlace - 16;
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}
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if (GifFile->Image.ColorMap)
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NumBytes = ((((long) GifFile->Image.Width) * GifFile->Image.Height)
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* GifFile->Image.ColorMap->BitsPerPixel) / 8;
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else if (GifFile->SColorMap != NULL)
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NumBytes = ((((long) GifFile->Image.Width) * GifFile->Image.Height)
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* GifFile->SColorMap->BitsPerPixel) / 8;
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/* FIXME: What should the compression ratio be if no color table? */
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if (NumBytes > 0) {
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int Percent = 100 * CodeCount / NumBytes;
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printf("\nCompression ratio: %ld/%ld (%d%%).\n",
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CodeCount, NumBytes, Percent);
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}
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return;
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}
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CrntPlace = 0;
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CodeCount = 0;
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}
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Len = CodeBlock[0];
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for (i = 1; i <= Len; i++) {
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if (CrntPlace == 0) {
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printf("\n%05lxh: ", CodeCount);
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CodeCount += 16;
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}
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(void)printf(" %02xh", CodeBlock[i]);
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if (++CrntPlace >= 16) CrntPlace = 0;
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}
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}
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/******************************************************************************
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Print the given Extension - a string in pascal notation (size in first
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place). Save local information so printing can be performed continuously,
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or reset to start state if Reset. If Extension is NULL, output is flushed
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******************************************************************************/
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static void PrintExtBlock(GifByteType *Extension, bool Reset)
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{
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static int CrntPlace = 0;
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static long ExtCount = 0;
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static char HexForm[49], AsciiForm[17];
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if (Reset || Extension == NULL) {
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if (Extension == NULL) {
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if (CrntPlace > 0) {
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HexForm[CrntPlace * 3] = 0;
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AsciiForm[CrntPlace] = 0;
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printf("\n%05lx: %-49s %-17s\n", ExtCount, HexForm, AsciiForm);
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return;
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}
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else
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printf("\n");
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}
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CrntPlace = 0;
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ExtCount = 0;
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}
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if (Extension != NULL) {
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int i, Len;
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Len = Extension[0];
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for (i = 1; i <= Len; i++) {
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(void)snprintf(&HexForm[CrntPlace * 3], 3,
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" %02x", Extension[i]);
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(void)snprintf(&AsciiForm[CrntPlace], 3,
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"%c", MAKE_PRINTABLE(Extension[i]));
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if (++CrntPlace == 16) {
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HexForm[CrntPlace * 3] = 0;
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AsciiForm[CrntPlace] = 0;
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printf("\n%05lx: %-49s %-17s", ExtCount, HexForm, AsciiForm);
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ExtCount += 16;
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CrntPlace = 0;
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}
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}
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}
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}
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/******************************************************************************
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Print the given PixelBlock of length Len.
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Save local information so printing can be performed continuously,
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or reset to start state if Reset. If PixelBlock is NULL, output is flushed
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******************************************************************************/
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static void PrintPixelBlock(GifByteType *PixelBlock, int Len, bool Reset)
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{
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static int CrntPlace = 0;
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static long ExtCount = 0;
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static char HexForm[49], AsciiForm[17];
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int i;
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if (Reset || PixelBlock == NULL) {
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if (PixelBlock == NULL) {
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if (CrntPlace > 0) {
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HexForm[CrntPlace * 3] = 0;
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AsciiForm[CrntPlace] = 0;
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printf("\n%05lx: %-49s %-17s\n", ExtCount, HexForm, AsciiForm);
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}
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else
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printf("\n");
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}
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CrntPlace = 0;
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ExtCount = 0;
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if (PixelBlock == NULL) return;
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}
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for (i = 0; i < Len; i++) {
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(void)snprintf(&HexForm[CrntPlace * 3], 3,
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" %02x", PixelBlock[i]);
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(void)snprintf(&AsciiForm[CrntPlace], 3,
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"%c", MAKE_PRINTABLE(PixelBlock[i]));
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if (++CrntPlace == 16) {
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HexForm[CrntPlace * 3] = 0;
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AsciiForm[CrntPlace] = 0;
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printf("\n%05lx: %-49s %-17s", ExtCount, HexForm, AsciiForm);
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ExtCount += 16;
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CrntPlace = 0;
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}
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}
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}
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/******************************************************************************
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Print the image as LZ codes (each 12bits), until EOF marker is reached.
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******************************************************************************/
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static void PrintLZCodes(GifFileType *GifFile)
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{
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int Code, CrntPlace = 0;
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long CodeCount = 0;
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do {
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if (CrntPlace == 0) printf("\n%05lx:", CodeCount);
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if (DGifGetLZCodes(GifFile, &Code) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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if (Code >= 0)
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printf(" %03x", Code); /* EOF Code is returned as -1. */
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CodeCount++;
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if (++CrntPlace >= 16) CrntPlace = 0;
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}
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while (Code >= 0);
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}
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/* end */
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