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gifbuild.c
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/*****************************************************************************
gifbuild - dump GIF data in a textual format, or undump it to a GIF
*****************************************************************************/
// SPDX-License-Identifier: MIT
// SPDX-File-Copyright-Txt: (C) Copyright 1989 Gershon Elber
#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "getarg.h"
#include "gif_lib.h"
#define PROGRAM_NAME "gifbuild"
static char *VerStr = PROGRAM_NAME VERSION_COOKIE __DATE__ ", " __TIME__ "\n";
static char *CtrlStr =
PROGRAM_NAME " v%- d%- t%-Characters!s h%- GifFile(s)!*s";
static char KeyLetters[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNO"
"PQRSTUVWXYZ!\"#$%&'()*+,-./:<=>?@[\\]^_`{|}~";
#define PRINTABLES (sizeof(KeyLetters) - 1)
static void Icon2Gif(char *FileName, FILE *txtin, bool, int fdout);
static void Gif2Icon(char *FileName, int fdin, int fdout, char NameTable[]);
static int EscapeString(char *cp, char *tp);
/******************************************************************************
Main sequence
******************************************************************************/
int main(int argc, char **argv) {
int NumFiles;
bool Error, DisasmFlag = false, HelpFlag = false, TextLineFlag = false,
GifNoisyPrint = false;
char **FileNames = NULL;
char *TextLines[1];
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifNoisyPrint, &DisasmFlag,
&TextLineFlag, &TextLines[0], &HelpFlag,
&NumFiles, &FileNames)) != false) {
GAPrintErrMsg(Error);
GAPrintHowTo(CtrlStr);
exit(EXIT_FAILURE);
}
if (HelpFlag) {
(void)fprintf(stderr, VerStr, GIFLIB_MAJOR, GIFLIB_MINOR);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
if (!DisasmFlag && NumFiles > 1) {
GIF_MESSAGE(
"Error in command line parsing - one text input please.");
GAPrintHowTo(CtrlStr);
exit(EXIT_FAILURE);
}
if (!DisasmFlag && TextLineFlag) {
GIF_MESSAGE(
"Error in command line parsing - -t invalid without -d.");
GAPrintHowTo(CtrlStr);
exit(EXIT_FAILURE);
}
if (NumFiles == 0) {
if (DisasmFlag)
Gif2Icon("Stdin", 0, 1,
TextLineFlag ? TextLines[0] : KeyLetters);
else
Icon2Gif("Stdin", stdin, GifNoisyPrint, 1);
} else {
int i;
for (i = 0; i < NumFiles; i++) {
FILE *fp;
if ((fp = fopen(FileNames[i], "r")) == (FILE *)NULL) {
(void)fprintf(stderr, "Can't open %s\n",
FileNames[i]);
exit(EXIT_FAILURE);
}
if (DisasmFlag) {
printf("#\n# GIF information from %s\n",
FileNames[i]);
Gif2Icon(FileNames[i], -1, 1,
TextLineFlag ? TextLines[0]
: KeyLetters);
} else {
Icon2Gif(FileNames[i], fp, GifNoisyPrint, 1);
}
(void)fclose(fp);
}
}
return 0;
}
/******************************************************************************
Parse image directives
******************************************************************************/
#define PARSE_ERROR(str) \
(void)fprintf(stderr, "%s:%d: %s\n", FileName, LineNum, str);
static void Icon2Gif(char *FileName, FILE *txtin, bool GifNoisyPrint,
int fdout) {
unsigned int ColorMapSize = 0;
GifColorType GlobalColorMap[256], LocalColorMap[256],
*ColorMap = GlobalColorMap;
char GlobalColorKeys[PRINTABLES], LocalColorKeys[PRINTABLES],
*KeyTable = GlobalColorKeys;
bool SortFlag = false;
unsigned int ExtCode, intval;
int red, green, blue, n;
char buf[BUFSIZ * 2], InclusionFile[64];
GifFileType *GifFileOut;
SavedImage *NewImage = NULL;
int LeadingExtensionBlockCount = 0;
ExtensionBlock *LeadingExtensionBlocks = NULL;
int ErrorCode, LineNum = 0;
if ((GifFileOut = EGifOpenFileHandle(fdout, &ErrorCode)) == NULL) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
/* OK, interpret directives */
/* coverity[tainted_data_transitive] */
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL) {
char *cp;
++LineNum;
/*
* Skip lines consisting only of whitespace and comments
*/
for (cp = buf; isspace((int)(*cp)); cp++) {
continue;
}
if (*cp == '#' || *cp == '\0') {
continue;
}
/*
* If there's a trailing comment, nuke it and all preceding
* whitespace. But preserve the EOL.
*/
if ((cp = strchr(buf, '#')) && (cp == strrchr(cp, '#'))) {
while (isspace((int)(*--cp))) {
continue;
}
*++cp = '\n';
*++cp = '\0';
}
/*
* Explicit header declarations
*/
if (sscanf(buf, "screen width %d\n", &GifFileOut->SWidth) ==
1) {
continue;
}
else if (sscanf(buf, "screen height %d\n",
&GifFileOut->SHeight) == 1) {
continue;
}
else if (sscanf(buf, "screen colors %d\n", &n) == 1) {
int ResBits = GifBitSize(n);
if (n > 256 || n < 0 || n != (1 << ResBits)) {
PARSE_ERROR("Invalid color resolution value.");
exit(EXIT_FAILURE);
}
GifFileOut->SColorResolution = ResBits;
continue;
}
else if (sscanf(buf, "screen background %d\n",
&GifFileOut->SBackGroundColor) == 1) {
continue;
}
else if (sscanf(buf, "pixel aspect byte %u\n", &intval) == 1) {
GifFileOut->AspectByte = (GifByteType)(intval & 0xff);
continue;
}
/*
* Color table parsing
*/
else if (strcmp(buf, "screen map\n") == 0) {
if (GifFileOut->SColorMap != NULL) {
PARSE_ERROR("You've already declared a global "
"color map.");
exit(EXIT_FAILURE);
}
ColorMapSize = 0;
ColorMap = GlobalColorMap;
SortFlag = false;
KeyTable = GlobalColorKeys;
memset(GlobalColorKeys, '\0', sizeof(GlobalColorKeys));
}
else if (strcmp(buf, "image map\n") == 0) {
if (NewImage == NULL) {
PARSE_ERROR("No previous image declaration.");
exit(EXIT_FAILURE);
}
ColorMapSize = 0;
ColorMap = LocalColorMap;
KeyTable = LocalColorKeys;
memset(LocalColorKeys, '\0', sizeof(LocalColorKeys));
}
else if (sscanf(buf, " rgb %d %d %d is %c", &red, &green,
&blue, &KeyTable[ColorMapSize]) == 4) {
if (ColorMapSize >= 256) {
PARSE_ERROR("Too many color entries.");
exit(EXIT_FAILURE);
}
ColorMap[ColorMapSize].Red = red;
ColorMap[ColorMapSize].Green = green;
ColorMap[ColorMapSize].Blue = blue;
ColorMapSize++;
}
else if (sscanf(buf, " rgb %d %d %d", &red, &green, &blue) ==
3) {
if (ColorMapSize >= 256) {
PARSE_ERROR("Too many color entries.");
exit(EXIT_FAILURE);
}
ColorMap[ColorMapSize].Red = red;
ColorMap[ColorMapSize].Green = green;
ColorMap[ColorMapSize].Blue = blue;
ColorMapSize++;
}
else if (strcmp(buf, " sort flag on\n") == 0) {
SortFlag = true;
}
else if (strcmp(buf, " sort flag off\n") == 0) {
SortFlag = false;
}
else if (strcmp(buf, "end\n") == 0) {
ColorMapObject *NewMap;
NewMap = GifMakeMapObject(1 << GifBitSize(ColorMapSize),
ColorMap);
if (NewMap == (ColorMapObject *)NULL) {
PARSE_ERROR("Out of memory while allocating "
"new color map.");
exit(EXIT_FAILURE);
}
NewMap->SortFlag = SortFlag;
if (NewImage) {
NewImage->ImageDesc.ColorMap = NewMap;
} else {
GifFileOut->SColorMap = NewMap;
}
}
/* GIF inclusion */
/* ugly magic number is because scanf has no */
else if (sscanf(buf, "include %63s", InclusionFile) == 1) {
bool DoTranslation;
GifPixelType Translation[256];
GifFileType *Inclusion;
SavedImage *CopyFrom;
if ((Inclusion = DGifOpenFileName(
InclusionFile, &ErrorCode)) == NULL) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
if (DGifSlurp(Inclusion) == GIF_ERROR) {
PARSE_ERROR("Inclusion read failed.");
// cppcheck-suppress knownConditionTrueFalse
if (Inclusion != NULL) {
PrintGifError(Inclusion->Error);
DGifCloseFile(Inclusion, NULL);
}
if (GifFileOut != NULL) {
EGifCloseFile(GifFileOut, NULL);
};
exit(EXIT_FAILURE);
}
// cppcheck-suppress nullPointerRedundantCheck
if ((DoTranslation = (GifFileOut->SColorMap !=
(ColorMapObject *)NULL))) {
ColorMapObject *UnionMap;
UnionMap = GifUnionColorMap(
// cppcheck-suppress nullPointerRedundantCheck
GifFileOut->SColorMap, Inclusion->SColorMap,
Translation);
if (UnionMap == NULL) {
PARSE_ERROR("Inclusion failed --- "
"global map conflict.");
// cppcheck-suppress nullPointerRedundantCheck
PrintGifError(GifFileOut->Error);
// cppcheck-suppress knownConditionTrueFalse
if (Inclusion != NULL) {
DGifCloseFile(Inclusion, NULL);
}
if (GifFileOut != NULL) {
EGifCloseFile(GifFileOut, NULL);
}
exit(EXIT_FAILURE);
}
GifFreeMapObject(GifFileOut->SColorMap);
GifFileOut->SColorMap = UnionMap;
}
for (CopyFrom = Inclusion->SavedImages;
CopyFrom <
Inclusion->SavedImages + Inclusion->ImageCount;
CopyFrom++) {
if ((NewImage = GifMakeSavedImage(
GifFileOut, CopyFrom)) == NULL) {
PARSE_ERROR("Inclusion failed --- out "
"of memory.");
// cppcheck-suppress nullPointerRedundantCheck
PrintGifError(GifFileOut->Error);
// cppcheck-suppress knownConditionTrueFalse
if (Inclusion != NULL) {
DGifCloseFile(Inclusion, NULL);
}
if (GifFileOut != NULL) {
EGifCloseFile(GifFileOut, NULL);
}
exit(EXIT_FAILURE);
} else if (DoTranslation) {
GifApplyTranslation(NewImage,
Translation);
}
GifQprintf("%s: Image %d at (%d, %d) [%dx%d]: "
"from %s\n",
PROGRAM_NAME, GifFileOut->ImageCount,
NewImage->ImageDesc.Left,
NewImage->ImageDesc.Top,
NewImage->ImageDesc.Width,
NewImage->ImageDesc.Height,
InclusionFile);
}
(void)DGifCloseFile(Inclusion, NULL);
}
/*
* Extension blocks.
*/
else if (strcmp(buf, "comment\n") == 0) {
int bc = 0;
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL) {
if (strcmp(buf, "end\n") == 0) {
break;
} else {
int Len;
buf[strlen(buf) - 1] = '\0';
Len = EscapeString(buf, buf);
if (GifAddExtensionBlock(
&LeadingExtensionBlockCount,
&LeadingExtensionBlocks,
bc++ == CONTINUE_EXT_FUNC_CODE
? COMMENT_EXT_FUNC_CODE
: 0,
Len, (unsigned char *)buf) ==
GIF_ERROR) {
PARSE_ERROR(
"out of memory while "
"adding comment block.");
exit(EXIT_FAILURE);
}
}
}
} else if (strcmp(buf, "plaintext\n") == 0) {
int bc = 0;
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL) {
if (strcmp(buf, "end\n") == 0) {
break;
} else {
int Len;
buf[strlen(buf) - 1] = '\0';
Len = EscapeString(buf, buf);
if (GifAddExtensionBlock(
&LeadingExtensionBlockCount,
&LeadingExtensionBlocks,
bc++ == CONTINUE_EXT_FUNC_CODE
? PLAINTEXT_EXT_FUNC_CODE
: 0,
Len, (unsigned char *)buf) ==
GIF_ERROR) {
PARSE_ERROR(
"out of memory while "
"adding plaintext block.");
exit(EXIT_FAILURE);
}
}
}
} else if (strcmp(buf, "graphics control\n") == 0) {
GraphicsControlBlock gcb;
size_t Len;
memset(&gcb, '\0', sizeof(gcb));
gcb.TransparentColor = NO_TRANSPARENT_COLOR;
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL) {
if (strcmp(buf, "end\n") == 0) {
break;
} else {
char *tp = buf;
while (isspace(*tp)) {
tp++;
}
if (sscanf(tp, "disposal mode %d\n",
&gcb.DisposalMode)) {
continue;
}
if (strcmp(tp,
"user input flag on\n") ==
0) {
gcb.UserInputFlag = true;
continue;
}
if (strcmp(tp,
"user input flag off\n") ==
0) {
gcb.UserInputFlag = false;
continue;
}
if (sscanf(tp, "delay %d\n",
&gcb.DelayTime)) {
continue;
}
if (sscanf(tp, "transparent index %d\n",
&gcb.TransparentColor)) {
continue;
}
(void)fputs(tp, stderr);
PARSE_ERROR("unrecognized directive in "
"GCB block.");
exit(EXIT_FAILURE);
}
}
Len = EGifGCBToExtension(&gcb, (GifByteType *)buf);
if (GifAddExtensionBlock(
&LeadingExtensionBlockCount,
&LeadingExtensionBlocks, GRAPHICS_EXT_FUNC_CODE,
Len, (unsigned char *)buf) == GIF_ERROR) {
PARSE_ERROR("out of memory while adding GCB.");
exit(EXIT_FAILURE);
}
} else if (sscanf(buf, "netscape loop %u", &intval)) {
unsigned char params[3] = {1, 0, 0};
/* Create a Netscape 2.0 loop block */
if (GifAddExtensionBlock(
&LeadingExtensionBlockCount,
&LeadingExtensionBlocks,
APPLICATION_EXT_FUNC_CODE, 11,
(unsigned char *)"NETSCAPE2.0") == GIF_ERROR) {
PARSE_ERROR(
"out of memory while adding loop block.");
exit(EXIT_FAILURE);
}
params[1] = (intval & 0xff);
params[2] = (intval >> 8) & 0xff;
if (GifAddExtensionBlock(&LeadingExtensionBlockCount,
&LeadingExtensionBlocks, 0,
sizeof(params),
params) == GIF_ERROR) {
PARSE_ERROR("out of memory while adding loop "
"continuation.");
exit(EXIT_FAILURE);
}
} else if (sscanf(buf, "extension %x", &ExtCode)) {
int bc = 0;
while (fgets(buf, sizeof(buf), txtin) != (char *)NULL) {
if (strcmp(buf, "end\n") == 0) {
break;
} else {
int Len;
buf[strlen(buf) - 1] = '\0';
Len = EscapeString(buf, buf);
if (GifAddExtensionBlock(
&LeadingExtensionBlockCount,
&LeadingExtensionBlocks,
bc++ == CONTINUE_EXT_FUNC_CODE
? ExtCode
: 0,
Len, (unsigned char *)buf) ==
GIF_ERROR) {
PARSE_ERROR(
"out of memory while "
"adding extension block.");
exit(EXIT_FAILURE);
}
}
}
}
/*
* Explicit image declarations
*/
else if (strcmp(buf, "image\n") == 0) {
if ((NewImage = GifMakeSavedImage(GifFileOut, NULL)) ==
(SavedImage *)NULL) {
PARSE_ERROR("Out of memory while allocating "
"image block.");
exit(EXIT_FAILURE);
}
/* use global table unless user specifies a local one */
ColorMap = GlobalColorMap;
KeyTable = GlobalColorKeys;
/* connect leading extension blocks */
NewImage->ExtensionBlockCount =
LeadingExtensionBlockCount;
NewImage->ExtensionBlocks = LeadingExtensionBlocks;
LeadingExtensionBlockCount = 0;
LeadingExtensionBlocks = NULL;
}
/*
* Nothing past this point is valid unless we've seen a previous
* image declaration.
*/
else if (NewImage == (SavedImage *)NULL) {
(void)fputs(buf, stderr);
PARSE_ERROR("Syntax error in header block.");
exit(EXIT_FAILURE);
}
/*
* Accept image attributes
*/
else if (sscanf(buf, "image top %d\n",
&NewImage->ImageDesc.Top) == 1) {
continue;
}
else if (sscanf(buf, "image left %d\n",
&NewImage->ImageDesc.Left) == 1) {
continue;
}
else if (strcmp(buf, "image interlaced\n") == 0) {
NewImage->ImageDesc.Interlace = true;
continue;
}
else if (sscanf(buf, "image bits %d by %d",
&NewImage->ImageDesc.Width,
&NewImage->ImageDesc.Height) == 2) {
int i, j;
static GifPixelType *Raster;
int c;
bool hex = (strstr(buf, "hex") != NULL);
/* coverity[overflow_sink] */
if ((Raster = (GifPixelType *)malloc(
sizeof(GifPixelType) *
NewImage->ImageDesc.Width *
NewImage->ImageDesc.Height)) == NULL) {
PARSE_ERROR("Failed to allocate raster block, "
"aborted.");
exit(EXIT_FAILURE);
}
GifQprintf("%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, GifFileOut->ImageCount,
NewImage->ImageDesc.Left,
NewImage->ImageDesc.Top,
NewImage->ImageDesc.Width,
NewImage->ImageDesc.Height);
GifByteType *tp = Raster;
for (i = 0; i < NewImage->ImageDesc.Height; i++) {
char *dp;
for (j = 0; j < NewImage->ImageDesc.Width;
j++) {
if ((c = fgetc(txtin)) == EOF) {
PARSE_ERROR("input file ended "
"prematurely.");
exit(EXIT_FAILURE);
} else if (c == '\n') {
--j;
++LineNum;
} else if (isspace(c)) {
--j;
} else if (hex) {
const static char *hexdigits =
"0123456789ABCDEF";
unsigned char hi, lo;
dp = strchr(hexdigits,
toupper(c));
if (dp == NULL) {
PARSE_ERROR(
"Invalid hex high "
"byte.");
exit(EXIT_FAILURE);
}
hi = (dp - hexdigits);
if ((c = fgetc(txtin)) == EOF) {
PARSE_ERROR(
"input file ended "
"prematurely.");
exit(EXIT_FAILURE);
}
dp = strchr(hexdigits,
toupper(c));
if (dp == NULL) {
PARSE_ERROR(
"Invalid hex low "
"byte.");
exit(EXIT_FAILURE);
}
lo = (dp - hexdigits);
*tp++ = (hi << 4) | lo;
} else if ((dp = strchr(KeyTable, c))) {
*tp++ = (dp - KeyTable);
} else {
PARSE_ERROR(
"Invalid ASCII pixel key.");
exit(EXIT_FAILURE);
}
}
if (GifNoisyPrint) {
fprintf(stderr, "\b\b\b\b%-4d", i);
}
}
if (GifNoisyPrint) {
putc('\n', stderr);
}
NewImage->RasterBits = (unsigned char *)Raster;
} else {
(void)fputs(buf, stderr);
PARSE_ERROR("Syntax error in image description.");
exit(EXIT_FAILURE);
}
}
/* connect trailing extension blocks */
GifFileOut->ExtensionBlockCount = LeadingExtensionBlockCount;
GifFileOut->ExtensionBlocks = LeadingExtensionBlocks;
// LeadingExtensionBlockCount = 0;
LeadingExtensionBlocks = NULL;
EGifSpew(GifFileOut);
}
static void VisibleDumpBuffer(GifByteType *buf, int len)
/* Visibilize a given string */
{
GifByteType *cp;
for (cp = buf; cp < buf + len; cp++) {
if (isprint((int)(*cp)) || *cp == ' ') {
putchar(*cp);
} else if (*cp == '\n') {
putchar('\\');
putchar('n');
} else if (*cp == '\r') {
putchar('\\');
putchar('r');
} else if (*cp == '\b') {
putchar('\\');
putchar('b');
} else if (*cp < ' ') {
putchar('\\');
putchar('^');
putchar('@' + *cp);
} else {
printf("\\0x%02x", *cp);
}
}
}
static void DumpExtensions(GifFileType *GifFileOut, int ExtensionBlockCount,
ExtensionBlock *ExtensionBlocks) {
ExtensionBlock *ep;
for (ep = ExtensionBlocks; ep < ExtensionBlocks + ExtensionBlockCount;
ep++) {
bool last = (ep - ExtensionBlocks == (ExtensionBlockCount - 1));
if (ep->Function == COMMENT_EXT_FUNC_CODE) {
printf("comment\n");
VisibleDumpBuffer(ep->Bytes, ep->ByteCount);
putchar('\n');
while (!last &&
ep[1].Function == CONTINUE_EXT_FUNC_CODE) {
++ep;
last = (ep - ExtensionBlocks ==
(ExtensionBlockCount - 1));
VisibleDumpBuffer(ep->Bytes, ep->ByteCount);
putchar('\n');
}
printf("end\n\n");
} else if (ep->Function == PLAINTEXT_EXT_FUNC_CODE) {
printf("plaintext\n");
VisibleDumpBuffer(ep->Bytes, ep->ByteCount);
putchar('\n');
while (!last &&
ep[1].Function == CONTINUE_EXT_FUNC_CODE) {
++ep;
last = (ep - ExtensionBlocks ==
(ExtensionBlockCount - 1));
VisibleDumpBuffer(ep->Bytes, ep->ByteCount);
putchar('\n');
}
printf("end\n\n");
} else if (ep->Function == GRAPHICS_EXT_FUNC_CODE) {
GraphicsControlBlock gcb;
printf("graphics control\n");
if (DGifExtensionToGCB(ep->ByteCount, ep->Bytes,
&gcb) == GIF_ERROR) {
GIF_MESSAGE("invalid graphics control block");
exit(EXIT_FAILURE);
}
printf("\tdisposal mode %d\n", gcb.DisposalMode);
printf("\tuser input flag %s\n",
gcb.UserInputFlag ? "on" : "off");
printf("\tdelay %d\n", gcb.DelayTime);
printf("\ttransparent index %d\n",
gcb.TransparentColor);
printf("end\n\n");
} else if (!last && ep->Function == APPLICATION_EXT_FUNC_CODE &&
ep->ByteCount >= 11 && (ep + 1)->ByteCount >= 3 &&
memcmp(ep->Bytes, "NETSCAPE2.0", 11) == 0) {
unsigned char *params = (++ep)->Bytes;
unsigned int loopcount = params[1] | (params[2] << 8);
printf("netscape loop %u\n\n", loopcount);
} else {
printf("extension 0x%02x\n", ep->Function);
VisibleDumpBuffer(ep->Bytes, ep->ByteCount);
while (!last &&
ep[1].Function == CONTINUE_EXT_FUNC_CODE) {
++ep;
last = (ep - ExtensionBlocks ==
(ExtensionBlockCount - 1));
VisibleDumpBuffer(ep->Bytes, ep->ByteCount);
putchar('\n');
}
printf("end\n\n");
}
}
}
static void Gif2Icon(char *FileName, int fdin, int fdout, char NameTable[]) {
int ErrorCode, im, i, j, ColorCount = 0;
GifFileType *GifFile;
if (fdin == -1) {
if ((GifFile = DGifOpenFileName(FileName, &ErrorCode)) ==
NULL) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
} else {
/* Use stdin instead: */
if ((GifFile = DGifOpenFileHandle(fdin, &ErrorCode)) == NULL) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
}
if (DGifSlurp(GifFile) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
printf("screen width %d\nscreen height %d\n", GifFile->SWidth,
GifFile->SHeight);
printf(
"screen colors %d\nscreen background %d\npixel aspect byte %u\n\n",
1 << GifFile->SColorResolution, GifFile->SBackGroundColor,
(unsigned)GifFile->AspectByte);
if (GifFile->SColorMap) {
printf("screen map\n");
printf("\tsort flag %s\n",
GifFile->SColorMap->SortFlag ? "on" : "off");
for (i = 0; i < GifFile->SColorMap->ColorCount; i++) {
if (GifFile->SColorMap->ColorCount < PRINTABLES) {
printf("\trgb %03d %03d %03d is %c\n",
GifFile->SColorMap->Colors[i].Red,
GifFile->SColorMap->Colors[i].Green,
GifFile->SColorMap->Colors[i].Blue,
NameTable[i]);
} else {
printf("\trgb %03d %03d %03d\n",
GifFile->SColorMap->Colors[i].Red,
GifFile->SColorMap->Colors[i].Green,
GifFile->SColorMap->Colors[i].Blue);
}
}
printf("end\n\n");
}
for (im = 0; im < GifFile->ImageCount; im++) {
SavedImage *image = &GifFile->SavedImages[im];
DumpExtensions(GifFile, image->ExtensionBlockCount,
image->ExtensionBlocks);
printf("image # %d\nimage left %d\nimage top %d\n", im + 1,
image->ImageDesc.Left, image->ImageDesc.Top);
if (image->ImageDesc.Interlace) {
printf("image interlaced\n");
}
if (image->ImageDesc.ColorMap) {
printf("image map\n");
printf("\tsort flag %s\n",
image->ImageDesc.ColorMap->SortFlag ? "on"
: "off");
if (image->ImageDesc.ColorMap->ColorCount <
PRINTABLES) {
for (i = 0;
i < image->ImageDesc.ColorMap->ColorCount;
i++) {
printf(
"\trgb %03d %03d %03d is %c\n",
image->ImageDesc.ColorMap->Colors[i]
.Red,
image->ImageDesc.ColorMap->Colors[i]
.Green,
image->ImageDesc.ColorMap->Colors[i]
.Blue,
NameTable[i]);
}
} else {
for (i = 0;
i < image->ImageDesc.ColorMap->ColorCount;
i++) {
printf(
"\trgb %03d %03d %03d\n",
image->ImageDesc.ColorMap->Colors[i]
.Red,
image->ImageDesc.ColorMap->Colors[i]
.Green,
image->ImageDesc.ColorMap->Colors[i]
.Blue);
}
}
printf("end\n\n");
}
/* one of these conditions has to be true */
if (image->ImageDesc.ColorMap) {
ColorCount = image->ImageDesc.ColorMap->ColorCount;
} else if (GifFile->SColorMap) {
ColorCount = GifFile->SColorMap->ColorCount;
}
if (ColorCount < PRINTABLES) {
printf("image bits %d by %d\n", image->ImageDesc.Width,
image->ImageDesc.Height);
} else {
printf("image bits %d by %d hex\n",
image->ImageDesc.Width, image->ImageDesc.Height);
}
for (i = 0; i < image->ImageDesc.Height; i++) {
for (j = 0; j < image->ImageDesc.Width; j++) {
GifByteType ch =
image->RasterBits
[i * image->ImageDesc.Width + j];
if (ColorCount < PRINTABLES &&
ch < PRINTABLES) {
putchar(NameTable[ch]);
} else {
printf("%02x", ch);
}
}
putchar('\n');
}
putchar('\n');
}
DumpExtensions(GifFile, GifFile->ExtensionBlockCount,
GifFile->ExtensionBlocks);
/* Tell EMACS this is a picture... */
printf("# The following sets edit modes for GNU EMACS\n");
printf("# Local "); /* ...break this up, so that EMACS doesn't */
printf("Variables:\n"); /* get confused when visiting *this* file! */
printf("# mode:picture\n");
printf("# truncate-lines:t\n");
printf("# End:\n");
if (fdin == -1) {
(void)printf("# End of %s dump\n", FileName);
}
/*
* Sanity checks.
*/
/* check that the background color isn't garbage (SF bug #87) */
if (GifFile->SBackGroundColor < 0 ||
(GifFile->SColorMap &&
GifFile->SBackGroundColor >= GifFile->SColorMap->ColorCount)) {
fprintf(stderr, "gifbuild: background color invalid for screen "
"colormap.\n");
}
if (DGifCloseFile(GifFile, &ErrorCode) == GIF_ERROR) {
PrintGifError(ErrorCode);
exit(EXIT_FAILURE);
}
}
static int EscapeString(char *cp, char *tp)
/* process standard C-style escape sequences in a string */
{
char *StartAddr = tp;
while (*cp) {
int cval = 0;
if (*cp == '\\' && strchr("0123456789xX", cp[1])) {
int dcount = 0;
if (*++cp == 'x' || *cp == 'X') {
char *dp,
*hex = "00112233445566778899aAbBcCdDeEfF";
for (++cp;
(dp = strchr(hex, *cp)) && (dcount++ < 2);
cp++) {
cval = (cval * 16) + (dp - hex) / 2;
}
} else if (*cp == '0') {
while (strchr("01234567", *cp) !=
(char *)NULL &&
(dcount++ < 3)) {
cval = (cval * 8) + (*cp++ - '0');
}
} else {
while ((strchr("0123456789", *cp) !=
(char *)NULL) &&
(dcount++ < 3)) {
cval = (cval * 10) + (*cp++ - '0');
}
}
} else if (*cp == '\\') /* C-style character escapes */
{
switch (*++cp) {
case '\\':
cval = '\\';
break;
case 'n':
cval = '\n';
break;
case 't':
cval = '\t';
break;
case 'b':
cval = '\b';
break;
case 'r':
cval = '\r';