libtiff/archive/tools/gif2tiff.c
Bob Friesenhahn 30366c9f22 * tools/Makefile.am: The libtiff tools bmp2tiff, gif2tiff,
ras2tiff, sgi2tiff, sgisv, and ycbcr are completely removed from
the distribution.  The libtiff tools rgb2ycbcr and thumbnail are
only built in the build tree for testing.  Old files are put in
new 'archive' subdirectory of the source repository, but not in
distribution archives.  These changes are made in order to lessen
the maintenance burden.
2016-06-05 19:53:59 +00:00

592 lines
15 KiB
C

/* $Id: gif2tiff.c,v 1.1 2016-06-05 19:53:59 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 <errno.h>
#include <math.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef NEED_LIBPORT
# include "libport.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);
int readscreen(void);
int readgifimage(char*);
int 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[])
{
#if !HAVE_DECL_OPTARG
extern int optind;
extern char *optarg;
#endif
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);
if (!readscreen())
return (-1);
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 '!': if (!readextension())
return (-1);
break;
default: fprintf(stderr, "illegal GIF block type\n");
return (-1);
}
}
return (0);
}
int
checksignature(void)
{
char buf[6];
if (fread(buf,1,6,infile) != 6) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
return 0;
}
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
*/
int
readscreen(void)
{
unsigned char buf[7];
if (fread(buf,1,7,infile) != 7) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
return 0;
}
global = buf[4] & 0x80;
if (global) {
globalbits = (buf[4] & 0x07) + 1;
if (fread(globalmap,3,((size_t)1)<<globalbits,infile) !=
((size_t)1)<<globalbits) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
return 0;
}
}
return 1;
}
int
readgifimage(char* mode)
{
unsigned char buf[9];
int local, interleaved;
unsigned char localmap[256][3];
int localbits;
int status;
size_t raster_size;
if (fread(buf, 1, 9, infile) != 9) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
return (0);
}
width = (buf[4] + (buf[5] << 8)) & 0xffff; /* 16 bit */
height = (buf[6] + (buf[7] << 8)) & 0xffff; /* 16 bit */
local = buf[8] & 0x80;
interleaved = buf[8] & 0x40;
if (width == 0UL || height == 0UL || (width > 2000000000UL / height)) {
fprintf(stderr, "Invalid value of width or height\n");
return(0);
}
if (local == 0 && global == 0) {
fprintf(stderr, "no colormap present for image\n");
return (0);
}
raster_size=width*height;
if ((raster_size/width) == height) {
raster_size += EXTRAFUDGE; /* Add elbow room */
} else {
raster_size=0;
}
if ((raster = (unsigned char*) _TIFFmalloc(raster_size)) == 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);
if (fread(localmap, 3, ((size_t)1)<<localbits, infile) !=
((size_t)1)<<localbits) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
return (0);
}
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).
*
*/
int
readextension(void)
{
int count;
char buf[255];
int status = 1;
(void) getc(infile);
while ((count = getc(infile)) && count <= 255)
if (fread(buf, 1, count, infile) != (size_t) count) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
status = 0;
break;
}
return status;
}
/*
* 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);
if (datasize > 12)
return 0;
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 <= 255; count = getc(infile)) {
if (fread(buf,1,count,infile) != (size_t)count) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
return 0;
}
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) {
if (code >= clear) {
fprintf(stderr, "bad input: code=%d is larger than clear=%d\n",code, clear);
return 0;
}
if (*fill >= raster + width*height) {
fprintf(stderr, "raster full before eoi code\n");
return 0;
}
*(*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 {
if (*fill >= raster + width*height) {
fprintf(stderr, "raster full before eoi code\n");
return 0;
}
*(*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 (rowsperstrip > height-row) {
rowsperstrip = height-row;
stripsize = TIFFVStripSize(tif, 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: 4
* fill-column: 78
* End:
*/