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/* $Header: /cvsroot/osrs/libtiff/tools/gif2tiff.c,v 1.4 2003/03/12 14:05:05 dron Exp $ */
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* Copyright (c) 1990-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* convert a GIF file into a TIFF file.
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* based on Paul Haeberli's fromgif program which in turn is
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* based on a GIF file reader by Marcel J.E. Mol March 23 1989
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* if input is 320 by 200 pixel aspect is probably 1.2
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* if input is 640 350 pixel aspect is probably 1.37
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#if defined(_WINDOWS) || defined(MSDOS)
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#define GIFGAMMA (1.5) /* smaller makes output img brighter */
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#define IMAX 0xffff /* max intensity value */
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#define EXTRAFUDGE 128 /* some people write BAD .gif files */
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#define streq(a,b) (strcmp(a,b) == 0)
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#define strneq(a,b,n) (strncmp(a,b,n) == 0)
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unsigned short gamtab[256];
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gamtab[i] = IMAX*pow(i/255.0,gam)+0.5;
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"usage: gif2tiff [options] input.gif output.tif",
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" -r # make each strip have no more than # rows",
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" -c lzw[:opts] compress output with Lempel-Ziv & Welch encoding",
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" -c zip[:opts] compress output with deflate encoding",
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" -c packbits compress output with packbits encoding",
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" -c none use no compression algorithm on output",
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"LZW and deflate options:",
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" # set predictor value",
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"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
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fprintf(stderr, "%s\n\n", TIFFGetVersion());
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for (i = 0; stuff[i] != NULL; i++)
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fprintf(stderr, "%s\n", stuff[i]);
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unsigned char *stackp;
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unsigned int prefix[4096];
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unsigned char suffix[4096];
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unsigned char stack[4096];
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int datasize,codesize,codemask; /* Decoder working variables */
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int clear,eoi; /* Special code values */
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int global; /* Is there a global color map? */
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int globalbits; /* Number of bits of global colors */
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unsigned char globalmap[COLSIZE][3];/* RGB values for global color map */
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unsigned char *raster; /* Decoded image data */
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unsigned long width, height;
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unsigned short red[COLSIZE];
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unsigned short green[COLSIZE];
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unsigned short blue[COLSIZE];
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char *filename, *imagename;
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static uint16 compression = COMPRESSION_PACKBITS;
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static uint16 predictor = 0;
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static uint32 rowsperstrip = (uint32) -1;
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static int processCompressOptions(char*);
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int checksignature(void);
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void readscreen(void);
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int readgifimage(char*);
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void readextension(void);
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int readraster(void);
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int process(int, unsigned char**);
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void initcolors(unsigned char [COLSIZE][3], int);
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void rasterize(int, char*);
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main(int argc, char* argv[])
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while ((c = getopt(argc, argv, "c:r:")) != -1)
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case 'c': /* compression scheme */
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if (!processCompressOptions(optarg))
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case 'r': /* rows/strip */
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rowsperstrip = atoi(optarg);
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if (argc - optind != 2)
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makegamtab(GIFGAMMA);
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filename = argv[optind];
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imagename = argv[optind+1];
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if ((infile = fopen(imagename, "r" BINMODE)) != NULL) {
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printf("overwrite %s? ", imagename); fflush(stdout);
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if (c != 'y' && c != 'Y')
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if ((infile = fopen(filename, "r" BINMODE)) == NULL) {
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processCompressOptions(char* opt)
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if (streq(opt, "none"))
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compression = COMPRESSION_NONE;
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else if (streq(opt, "packbits"))
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compression = COMPRESSION_PACKBITS;
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else if (strneq(opt, "lzw", 3)) {
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char* cp = strchr(opt, ':');
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predictor = atoi(cp+1);
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compression = COMPRESSION_LZW;
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} else if (strneq(opt, "zip", 3)) {
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char* cp = strchr(opt, ':');
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predictor = atoi(cp+1);
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compression = COMPRESSION_DEFLATE;
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if (!checksignature())
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while ((ch = getc(infile)) != ';' && ch != EOF) {
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case '\0': break; /* this kludge for non-standard files */
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case ',': if (!readgifimage(mode))
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mode = "a"; /* subsequent images append */
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case '!': readextension();
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default: fprintf(stderr, "illegal GIF block type\n");
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fread(buf,1,6,infile);
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if (strncmp(buf,"GIF",3)) {
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fprintf(stderr, "file is not a GIF file\n");
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if (strncmp(&buf[3],"87a",3)) {
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fprintf(stderr, "unknown GIF version number\n");
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* Get information which is global to all the images stored
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unsigned char buf[7];
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fread(buf,1,7,infile);
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global = buf[4] & 0x80;
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globalbits = (buf[4] & 0x07) + 1;
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fread(globalmap,3,1<<globalbits,infile);
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readgifimage(char* mode)
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unsigned char buf[9];
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int local, interleaved;
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unsigned char localmap[256][3];
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if (fread(buf, 1, 9, infile) == 0) {
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width = buf[4] + (buf[5] << 8);
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height = buf[6] + (buf[7] << 8);
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local = buf[8] & 0x80;
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interleaved = buf[8] & 0x40;
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if (local == 0 && global == 0) {
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fprintf(stderr, "no colormap present for image\n");
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if ((raster = (unsigned char*) _TIFFmalloc(width*height+EXTRAFUDGE)) == NULL) {
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fprintf(stderr, "not enough memory for image\n");
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localbits = (buf[8] & 0x7) + 1;
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fprintf(stderr, " local colors: %d\n", 1<<localbits);
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fread(localmap, 3, 1<<localbits, infile);
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initcolors(localmap, 1<<localbits);
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initcolors(globalmap, 1<<globalbits);
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if (status = readraster())
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rasterize(interleaved, mode);
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* Read a GIF extension block (and do nothing with it).
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while (count = getc(infile))
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fread(buf, 1, count, infile);
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* Decode a raster image
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unsigned char *fill = raster;
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unsigned char buf[255];
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register unsigned long datum=0;
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register unsigned char *ch;
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register int count, code;
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datasize = getc(infile);
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clear = 1 << datasize;
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codesize = datasize + 1;
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codemask = (1 << codesize) - 1;
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for (code = 0; code < clear; code++) {
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for (count = getc(infile); count > 0; count = getc(infile)) {
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fread(buf,1,count,infile);
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for (ch=buf; count-- > 0; ch++) {
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datum += (unsigned long) *ch << bits;
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while (bits >= codesize) {
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code = datum & codemask;
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if (code == eoi) { /* This kludge put in */
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goto exitloop; /* because some GIF files*/
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} /* aren't standard */
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if (!process(code, &fill)) {
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if (fill >= raster + width*height) {
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fprintf(stderr, "raster full before eoi code\n");
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if (fill != raster + width*height) {
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fprintf(stderr, "warning: wrong rastersize: %ld bytes\n",
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(long) (fill-raster));
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fprintf(stderr, " instead of %ld bytes\n",
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(long) width*height);
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* Process a compression code. "clear" resets the code table.
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* Otherwise make a new code table entry, and output the bytes
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* associated with the code.
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process(register int code, unsigned char** fill)
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static unsigned char firstchar;
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codesize = datasize + 1;
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codemask = (1 << codesize) - 1;
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*(*fill)++ = suffix[code];
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firstchar = oldcode = code;
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fprintf(stderr, "code %d too large for %d\n", code, avail);
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if (code == avail) { /* the first code is always < avail */
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*stackp++ = firstchar;
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while (code > clear) {
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*stackp++ = suffix[code];
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*stackp++ = firstchar = suffix[code];
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prefix[avail] = oldcode;
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suffix[avail] = firstchar;
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if (((avail & codemask) == 0) && (avail < 4096)) {
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*(*fill)++ = *--stackp;
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} while (stackp > stack);
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* Convert a color map (local or global) to arrays with R, G and B
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initcolors(unsigned char colormap[COLSIZE][3], int ncolors)
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for (i = 0; i < ncolors; i++) {
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red[i] = gamtab[colormap[i][0]];
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green[i] = gamtab[colormap[i][1]];
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blue[i] = gamtab[colormap[i][2]];
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rasterize(int interleaved, char* mode)
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unsigned char *newras;
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if ((newras = (unsigned char*) _TIFFmalloc(width*height+EXTRAFUDGE)) == NULL) {
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fprintf(stderr, "not enough memory for image\n");
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#define DRAWSEGMENT(offset, step) { \
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for (row = offset; row < height; row += step) { \
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_TIFFmemcpy(newras + row*width, ras, width);\
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tif = TIFFOpen(imagename, mode);
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TIFFError(imagename,"Can not open output image");
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TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32) width);
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TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32) height);
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TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE);
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TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
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TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
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TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
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TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,
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rowsperstrip = TIFFDefaultStripSize(tif, rowsperstrip));
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TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
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switch (compression) {
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case COMPRESSION_LZW:
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case COMPRESSION_DEFLATE:
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TIFFSetField(tif, TIFFTAG_PREDICTOR, predictor);
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TIFFSetField(tif, TIFFTAG_COLORMAP, red, green, blue);
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TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
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stripsize = TIFFStripSize(tif);
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for (row=0; row<height; row += rowsperstrip) {
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if (TIFFWriteEncodedStrip(tif, strip, newras+row*width, stripsize) < 0)
added
removed
tools/gif2tiff.c
