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+/* $Id: gif2tiff.c,v 1.8.2.1 2010-06-08 18:50:44 bfriesen Exp $ */
+
+/*
+ * Copyright (c) 1990-1997 Sam Leffler
+ * Copyright (c) 1991-1997 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the names of
+ * Sam Leffler and Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Sam Leffler and Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+/*
+ * convert a GIF file into a TIFF file.
+ * based on Paul Haeberli's fromgif program which in turn is
+ * based on a GIF file reader by Marcel J.E. Mol March 23 1989
+ *
+ * if input is 320 by 200 pixel aspect is probably 1.2
+ * if input is 640 350 pixel aspect is probably 1.37
+ *
+ */
+#include "tif_config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "tiffio.h"
+
+#define GIFGAMMA (1.5) /* smaller makes output img brighter */
+#define IMAX 0xffff /* max intensity value */
+#define EXTRAFUDGE 128 /* some people write BAD .gif files */
+
+#define streq(a,b) (strcmp(a,b) == 0)
+#define strneq(a,b,n) (strncmp(a,b,n) == 0)
+
+unsigned short gamtab[256];
+
+void
+makegamtab(float gam)
+{
+ int i;
+
+ for(i=0; i<256; i++)
+ gamtab[i] = (unsigned short) (IMAX*pow(i/255.0,gam)+0.5);
+}
+
+char* stuff[] = {
+"usage: gif2tiff [options] input.gif output.tif",
+"where options are:",
+" -r # make each strip have no more than # rows",
+"",
+" -c lzw[:opts] compress output with Lempel-Ziv & Welch encoding",
+" -c zip[:opts] compress output with deflate encoding",
+" -c packbits compress output with packbits encoding",
+" -c none use no compression algorithm on output",
+"",
+"LZW and deflate options:",
+" # set predictor value",
+"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
+NULL
+};
+
+static void
+usage(void)
+{
+ char buf[BUFSIZ];
+ int i;
+
+ setbuf(stderr, buf);
+ fprintf(stderr, "%s\n\n", TIFFGetVersion());
+ for (i = 0; stuff[i] != NULL; i++)
+ fprintf(stderr, "%s\n", stuff[i]);
+ exit(-1);
+}
+
+#define COLSIZE 256
+
+unsigned char *stackp;
+unsigned int prefix[4096];
+unsigned char suffix[4096];
+unsigned char stack[4096];
+int datasize,codesize,codemask; /* Decoder working variables */
+int clear,eoi; /* Special code values */
+int avail, oldcode;
+
+FILE *infile;
+int global; /* Is there a global color map? */
+int globalbits; /* Number of bits of global colors */
+unsigned char globalmap[COLSIZE][3];/* RGB values for global color map */
+unsigned char *raster; /* Decoded image data */
+unsigned long width, height;
+unsigned short red[COLSIZE];
+unsigned short green[COLSIZE];
+unsigned short blue[COLSIZE];
+char *filename, *imagename;
+
+static uint16 compression = COMPRESSION_PACKBITS;
+static uint16 predictor = 0;
+static uint32 rowsperstrip = (uint32) -1;
+static int processCompressOptions(char*);
+
+int convert(void);
+int checksignature(void);
+void readscreen(void);
+int readgifimage(char*);
+void readextension(void);
+int readraster(void);
+int process(int, unsigned char**);
+void initcolors(unsigned char [COLSIZE][3], int);
+void rasterize(int, char*);
+
+int
+main(int argc, char* argv[])
+{
+ extern int optind;
+ extern char *optarg;
+ int c, status;
+
+ while ((c = getopt(argc, argv, "c:r:")) != -1)
+ switch (c) {
+ case 'c': /* compression scheme */
+ if (!processCompressOptions(optarg))
+ usage();
+ break;
+ case 'r': /* rows/strip */
+ rowsperstrip = atoi(optarg);
+ break;
+ case '?':
+ usage();
+ /*NOTREACHED*/
+ }
+ if (argc - optind != 2)
+ usage();
+
+ makegamtab(GIFGAMMA);
+ filename = argv[optind];
+ imagename = argv[optind+1];
+ if ((infile = fopen(imagename, "rb")) != NULL) {
+ int c;
+ fclose(infile);
+ printf("overwrite %s? ", imagename); fflush(stdout);
+ c = getc(stdin);
+ if (c != 'y' && c != 'Y')
+ return (1);
+ }
+ if ((infile = fopen(filename, "rb")) == NULL) {
+ perror(filename);
+ return (1);
+ }
+ status = convert();
+ fclose(infile);
+ return (status);
+}
+
+static int
+processCompressOptions(char* opt)
+{
+ if (streq(opt, "none"))
+ compression = COMPRESSION_NONE;
+ else if (streq(opt, "packbits"))
+ compression = COMPRESSION_PACKBITS;
+ else if (strneq(opt, "lzw", 3)) {
+ char* cp = strchr(opt, ':');
+ if (cp)
+ predictor = atoi(cp+1);
+ compression = COMPRESSION_LZW;
+ } else if (strneq(opt, "zip", 3)) {
+ char* cp = strchr(opt, ':');
+ if (cp)
+ predictor = atoi(cp+1);
+ compression = COMPRESSION_DEFLATE;
+ } else
+ return (0);
+ return (1);
+}
+
+int
+convert(void)
+{
+ int ch;
+ char* mode = "w";
+
+ if (!checksignature())
+ return (-1);
+ readscreen();
+ while ((ch = getc(infile)) != ';' && ch != EOF) {
+ switch (ch) {
+ case '\0': break; /* this kludge for non-standard files */
+ case ',': if (!readgifimage(mode))
+ return (-1);
+ mode = "a"; /* subsequent images append */
+ break;
+ case '!': readextension();
+ break;
+ default: fprintf(stderr, "illegal GIF block type\n");
+ return (-1);
+ }
+ }
+ return (0);
+}
+
+int
+checksignature(void)
+{
+ char buf[6];
+
+ fread(buf,1,6,infile);
+ if (strncmp(buf,"GIF",3)) {
+ fprintf(stderr, "file is not a GIF file\n");
+ return 0;
+ }
+ if (strncmp(&buf[3],"87a",3)) {
+ fprintf(stderr, "unknown GIF version number\n");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * readscreen -
+ * Get information which is global to all the images stored
+ * in the file
+ */
+void
+readscreen(void)
+{
+ unsigned char buf[7];
+
+ fread(buf,1,7,infile);
+ global = buf[4] & 0x80;
+ if (global) {
+ globalbits = (buf[4] & 0x07) + 1;
+ fread(globalmap,3,1<<globalbits,infile);
+ }
+}
+
+int
+readgifimage(char* mode)
+{
+ unsigned char buf[9];
+ int local, interleaved;
+ unsigned char localmap[256][3];
+ int localbits;
+ int status;
+
+ if (fread(buf, 1, 9, infile) == 0) {
+ perror(filename);
+ return (0);
+ }
+ width = buf[4] + (buf[5] << 8);
+ height = buf[6] + (buf[7] << 8);
+ local = buf[8] & 0x80;
+ interleaved = buf[8] & 0x40;
+
+ if (local == 0 && global == 0) {
+ fprintf(stderr, "no colormap present for image\n");
+ return (0);
+ }
+ if ((raster = (unsigned char*) _TIFFmalloc(width*height+EXTRAFUDGE)) == NULL) {
+ fprintf(stderr, "not enough memory for image\n");
+ return (0);
+ }
+ if (local) {
+ localbits = (buf[8] & 0x7) + 1;
+
+ fprintf(stderr, " local colors: %d\n", 1<<localbits);
+
+ fread(localmap, 3, 1<<localbits, infile);
+ initcolors(localmap, 1<<localbits);
+ } else if (global) {
+ initcolors(globalmap, 1<<globalbits);
+ }
+ if ((status = readraster()))
+ rasterize(interleaved, mode);
+ _TIFFfree(raster);
+ return status;
+}
+
+/*
+ * readextension -
+ * Read a GIF extension block (and do nothing with it).
+ *
+ */
+void
+readextension(void)
+{
+ int count;
+ char buf[255];
+
+ (void) getc(infile);
+ while ((count = getc(infile)))
+ fread(buf, 1, count, infile);
+}
+
+/*
+ * readraster -
+ * Decode a raster image
+ *
+ */
+int
+readraster(void)
+{
+ unsigned char *fill = raster;
+ unsigned char buf[255];
+ register int bits=0;
+ register unsigned long datum=0;
+ register unsigned char *ch;
+ register int count, code;
+ int status = 1;
+
+ datasize = getc(infile);
+ clear = 1 << datasize;
+ eoi = clear + 1;
+ avail = clear + 2;
+ oldcode = -1;
+ codesize = datasize + 1;
+ codemask = (1 << codesize) - 1;
+ for (code = 0; code < clear; code++) {
+ prefix[code] = 0;
+ suffix[code] = code;
+ }
+ stackp = stack;
+ for (count = getc(infile); count > 0; count = getc(infile)) {
+ fread(buf,1,count,infile);
+ for (ch=buf; count-- > 0; ch++) {
+ datum += (unsigned long) *ch << bits;
+ bits += 8;
+ while (bits >= codesize) {
+ code = datum & codemask;
+ datum >>= codesize;
+ bits -= codesize;
+ if (code == eoi) { /* This kludge put in */
+ goto exitloop; /* because some GIF files*/
+ } /* aren't standard */
+ if (!process(code, &fill)) {
+ status = 0;
+ goto exitloop;
+ }
+ }
+ }
+ if (fill >= raster + width*height) {
+ fprintf(stderr, "raster full before eoi code\n");
+ break;
+ }
+ }
+exitloop:
+ if (fill != raster + width*height) {
+ fprintf(stderr, "warning: wrong rastersize: %ld bytes\n",
+ (long) (fill-raster));
+ fprintf(stderr, " instead of %ld bytes\n",
+ (long) width*height);
+ }
+ return status;
+}
+
+/*
+ * process -
+ * Process a compression code. "clear" resets the code table.
+ * Otherwise make a new code table entry, and output the bytes
+ * associated with the code.
+ */
+int
+process(register int code, unsigned char** fill)
+{
+ int incode;
+ static unsigned char firstchar;
+
+ if (code == clear) {
+ codesize = datasize + 1;
+ codemask = (1 << codesize) - 1;
+ avail = clear + 2;
+ oldcode = -1;
+ return 1;
+ }
+
+ if (oldcode == -1) {
+ *(*fill)++ = suffix[code];
+ firstchar = oldcode = code;
+ return 1;
+ }
+ if (code > avail) {
+ fprintf(stderr, "code %d too large for %d\n", code, avail);
+ return 0;
+ }
+
+ incode = code;
+ if (code == avail) { /* the first code is always < avail */
+ *stackp++ = firstchar;
+ code = oldcode;
+ }
+ while (code > clear) {
+ *stackp++ = suffix[code];
+ code = prefix[code];
+ }
+
+ *stackp++ = firstchar = suffix[code];
+ prefix[avail] = oldcode;
+ suffix[avail] = firstchar;
+ avail++;
+
+ if (((avail & codemask) == 0) && (avail < 4096)) {
+ codesize++;
+ codemask += avail;
+ }
+ oldcode = incode;
+ do {
+ *(*fill)++ = *--stackp;
+ } while (stackp > stack);
+ return 1;
+}
+
+/*
+ * initcolors -
+ * Convert a color map (local or global) to arrays with R, G and B
+ * values.
+ *
+ */
+void
+initcolors(unsigned char colormap[COLSIZE][3], int ncolors)
+{
+ register int i;
+
+ for (i = 0; i < ncolors; i++) {
+ red[i] = gamtab[colormap[i][0]];
+ green[i] = gamtab[colormap[i][1]];
+ blue[i] = gamtab[colormap[i][2]];
+ }
+}
+
+void
+rasterize(int interleaved, char* mode)
+{
+ register unsigned long row;
+ unsigned char *newras;
+ unsigned char *ras;
+ TIFF *tif;
+ tstrip_t strip;
+ tsize_t stripsize;
+
+ if ((newras = (unsigned char*) _TIFFmalloc(width*height+EXTRAFUDGE)) == NULL) {
+ fprintf(stderr, "not enough memory for image\n");
+ return;
+ }
+#define DRAWSEGMENT(offset, step) { \
+ for (row = offset; row < height; row += step) { \
+ _TIFFmemcpy(newras + row*width, ras, width);\
+ ras += width; \
+ } \
+ }
+ ras = raster;
+ if (interleaved) {
+ DRAWSEGMENT(0, 8);
+ DRAWSEGMENT(4, 8);
+ DRAWSEGMENT(2, 4);
+ DRAWSEGMENT(1, 2);
+ } else
+ DRAWSEGMENT(0, 1);
+#undef DRAWSEGMENT
+
+ tif = TIFFOpen(imagename, mode);
+ if (!tif) {
+ TIFFError(imagename,"Can not open output image");
+ exit(-1);
+ }
+ TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32) width);
+ TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32) height);
+ TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE);
+ TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
+ TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
+ TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
+ TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,
+ rowsperstrip = TIFFDefaultStripSize(tif, rowsperstrip));
+ TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
+ switch (compression) {
+ case COMPRESSION_LZW:
+ case COMPRESSION_DEFLATE:
+ if (predictor != 0)
+ TIFFSetField(tif, TIFFTAG_PREDICTOR, predictor);
+ break;
+ }
+ TIFFSetField(tif, TIFFTAG_COLORMAP, red, green, blue);
+ TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
+ strip = 0;
+ stripsize = TIFFStripSize(tif);
+ for (row=0; row<height; row += rowsperstrip) {
+ if (TIFFWriteEncodedStrip(tif, strip, newras+row*width, stripsize) < 0)
+ break;
+ strip++;
+ }
+ TIFFClose(tif);
+
+ _TIFFfree(newras);
+}
+
+/* vim: set ts=8 sts=8 sw=8 noet: */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 8
+ * fill-column: 78
+ * End:
+ */
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