[wxWidgets.git] / src / tiff / tools / gif2tiff.c


/*
 * 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

#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);
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,((size_t)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, ((size_t)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 (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: 8
 * fill-column: 78
 * End:
 */
Commit	Line	Data
8414a40c VZ	1
	2	/*
	3	* Copyright (c) 1990-1997 Sam Leffler
	4	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	*
	6	* Permission to use, copy, modify, distribute, and sell this software and
	7	* its documentation for any purpose is hereby granted without fee, provided
	8	* that (i) the above copyright notices and this permission notice appear in
	9	* all copies of the software and related documentation, and (ii) the names of
	10	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	* publicity relating to the software without the specific, prior written
	12	* permission of Sam Leffler and Silicon Graphics.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	*
	18	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	* OF THIS SOFTWARE.
	24	*/
	25
	26	/*
	27	* convert a GIF file into a TIFF file.
	28	* based on Paul Haeberli's fromgif program which in turn is
	29	* based on a GIF file reader by Marcel J.E. Mol March 23 1989
	30	*
	31	* if input is 320 by 200 pixel aspect is probably 1.2
	32	* if input is 640 350 pixel aspect is probably 1.37
	33	*
	34	*/
	35	#include "tif_config.h"
	36
	37	#include <stdio.h>
	38	#include <stdlib.h>
	39	#include <string.h>
	40	#include <math.h>
	41
	42	#ifdef HAVE_UNISTD_H
	43	# include <unistd.h>
	44	#endif
	45
80ed523f VZ	46	#ifdef NEED_LIBPORT
	47	# include "libport.h"
	48	#endif
	49
8414a40c VZ	50	#include "tiffio.h"
	51
	52	#define GIFGAMMA (1.5) /* smaller makes output img brighter */
	53	#define IMAX 0xffff /* max intensity value */
	54	#define EXTRAFUDGE 128 /* some people write BAD .gif files */
	55
	56	#define streq(a,b) (strcmp(a,b) == 0)
	57	#define strneq(a,b,n) (strncmp(a,b,n) == 0)
	58
	59	unsigned short gamtab[256];
	60
	61	void
	62	makegamtab(float gam)
	63	{
	64	int i;
	65
	66	for(i=0; i<256; i++)
	67	gamtab[i] = (unsigned short) (IMAX*pow(i/255.0,gam)+0.5);
	68	}
	69
	70	char* stuff[] = {
	71	"usage: gif2tiff [options] input.gif output.tif",
	72	"where options are:",
	73	" -r # make each strip have no more than # rows",
	74	"",
	75	" -c lzw[:opts] compress output with Lempel-Ziv & Welch encoding",
	76	" -c zip[:opts] compress output with deflate encoding",
	77	" -c packbits compress output with packbits encoding",
	78	" -c none use no compression algorithm on output",
	79	"",
	80	"LZW and deflate options:",
	81	" # set predictor value",
	82	"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
	83	NULL
	84	};
	85
	86	static void
	87	usage(void)
	88	{
	89	char buf[BUFSIZ];
	90	int i;
	91
	92	setbuf(stderr, buf);
	93	fprintf(stderr, "%s\n\n", TIFFGetVersion());
	94	for (i = 0; stuff[i] != NULL; i++)
	95	fprintf(stderr, "%s\n", stuff[i]);
	96	exit(-1);
	97	}
	98
	99	#define COLSIZE 256
	100
	101	unsigned char *stackp;
	102	unsigned int prefix[4096];
	103	unsigned char suffix[4096];
	104	unsigned char stack[4096];
	105	int datasize,codesize,codemask; /* Decoder working variables */
	106	int clear,eoi; /* Special code values */
	107	int avail, oldcode;
	108
	109	FILE *infile;
	110	int global; /* Is there a global color map? */
	111	int globalbits; /* Number of bits of global colors */
	112	unsigned char globalmap[COLSIZE][3];/* RGB values for global color map */
	113	unsigned char raster; / Decoded image data */
114	unsigned long width, height;
115	unsigned short red[COLSIZE];
116	unsigned short green[COLSIZE];
117	unsigned short blue[COLSIZE];
118	char filename, imagename;
119
120	static uint16 compression = COMPRESSION_PACKBITS;
121	static uint16 predictor = 0;
122	static uint32 rowsperstrip = (uint32) -1;
123	static int processCompressOptions(char*);
124
125	int convert(void);
126	int checksignature(void);
127	void readscreen(void);
128	int readgifimage(char*);
129	void readextension(void);
130	int readraster(void);
131	int process(int, unsigned char**);
132	void initcolors(unsigned char [COLSIZE][3], int);
133	void rasterize(int, char*);
134
135	int
136	main(int argc, char* argv[])
137	{
138	extern int optind;
139	extern char *optarg;
140	int c, status;
141
142	while ((c = getopt(argc, argv, "c:r:")) != -1)
143	switch (c) {
144	case 'c': /* compression scheme */
145	if (!processCompressOptions(optarg))
146	usage();
147	break;
148	case 'r': /* rows/strip */
149	rowsperstrip = atoi(optarg);
150	break;
151	case '?':
152	usage();
153	/NOTREACHED/
154	}
155	if (argc - optind != 2)
156	usage();
157
158	makegamtab(GIFGAMMA);
159	filename = argv[optind];
160	imagename = argv[optind+1];
161	if ((infile = fopen(imagename, "rb")) != NULL) {
162	int c;
163	fclose(infile);
164	printf("overwrite %s? ", imagename); fflush(stdout);
165	c = getc(stdin);
166	if (c != 'y' && c != 'Y')
167	return (1);
168	}
169	if ((infile = fopen(filename, "rb")) == NULL) {
170	perror(filename);
171	return (1);
172	}
173	status = convert();
174	fclose(infile);
175	return (status);
176	}
177
178	static int
179	processCompressOptions(char* opt)
180	{
181	if (streq(opt, "none"))
182	compression = COMPRESSION_NONE;
183	else if (streq(opt, "packbits"))
184	compression = COMPRESSION_PACKBITS;
185	else if (strneq(opt, "lzw", 3)) {
186	char* cp = strchr(opt, ':');
187	if (cp)
188	predictor = atoi(cp+1);
189	compression = COMPRESSION_LZW;
190	} else if (strneq(opt, "zip", 3)) {
191	char* cp = strchr(opt, ':');
192	if (cp)
193	predictor = atoi(cp+1);
194	compression = COMPRESSION_DEFLATE;
195	} else
196	return (0);
197	return (1);
198	}
199
200	int
201	convert(void)
202	{
203	int ch;
204	char* mode = "w";
205
206	if (!checksignature())
207	return (-1);
208	readscreen();
209	while ((ch = getc(infile)) != ';' && ch != EOF) {
210	switch (ch) {
211	case '\0': break; /* this kludge for non-standard files */
212	case ',': if (!readgifimage(mode))
213	return (-1);
214	mode = "a"; /* subsequent images append */
215	break;
216	case '!': readextension();
217	break;
218	default: fprintf(stderr, "illegal GIF block type\n");
219	return (-1);
220	}
221	}
222	return (0);
223	}
224
225	int
226	checksignature(void)
227	{
228	char buf[6];
229
230	fread(buf,1,6,infile);
231	if (strncmp(buf,"GIF",3)) {
232	fprintf(stderr, "file is not a GIF file\n");
233	return 0;
234	}
235	if (strncmp(&buf[3],"87a",3)) {
236	fprintf(stderr, "unknown GIF version number\n");
237	return 0;
238	}
239	return 1;
240	}
241
242	/*
243	* readscreen -
244	* Get information which is global to all the images stored
245	* in the file
246	*/
247	void
248	readscreen(void)
249	{
250	unsigned char buf[7];
251
252	fread(buf,1,7,infile);
253	global = buf[4] & 0x80;
254	if (global) {
255	globalbits = (buf[4] & 0x07) + 1;
80ed523f	256	fread(globalmap,3,((size_t)1)<<globalbits,infile);
8414a40c VZ	257	}
	258	}
	259
	260	int
	261	readgifimage(char* mode)
	262	{
	263	unsigned char buf[9];
	264	int local, interleaved;
	265	unsigned char localmap[256][3];
	266	int localbits;
	267	int status;
	268
	269	if (fread(buf, 1, 9, infile) == 0) {
	270	perror(filename);
	271	return (0);
	272	}
	273	width = buf[4] + (buf[5] << 8);
	274	height = buf[6] + (buf[7] << 8);
	275	local = buf[8] & 0x80;
	276	interleaved = buf[8] & 0x40;
	277
	278	if (local == 0 && global == 0) {
	279	fprintf(stderr, "no colormap present for image\n");
	280	return (0);
	281	}
	282	if ((raster = (unsigned char) _TIFFmalloc(widthheight+EXTRAFUDGE)) == NULL) {
	283	fprintf(stderr, "not enough memory for image\n");
	284	return (0);
	285	}
	286	if (local) {
	287	localbits = (buf[8] & 0x7) + 1;
	288
	289	fprintf(stderr, " local colors: %d\n", 1<<localbits);
	290
80ed523f	291	fread(localmap, 3, ((size_t)1)<<localbits, infile);
8414a40c VZ	292	initcolors(localmap, 1<<localbits);
	293	} else if (global) {
	294	initcolors(globalmap, 1<<globalbits);
	295	}
	296	if ((status = readraster()))
	297	rasterize(interleaved, mode);
	298	_TIFFfree(raster);
	299	return status;
	300	}
	301
	302	/*
	303	* readextension -
	304	* Read a GIF extension block (and do nothing with it).
	305	*
	306	*/
	307	void
	308	readextension(void)
	309	{
	310	int count;
	311	char buf[255];
	312
	313	(void) getc(infile);
	314	while ((count = getc(infile)))
	315	fread(buf, 1, count, infile);
	316	}
	317
	318	/*
	319	* readraster -
	320	* Decode a raster image
	321	*
	322	*/
	323	int
	324	readraster(void)
	325	{
	326	unsigned char *fill = raster;
	327	unsigned char buf[255];
	328	register int bits=0;
	329	register unsigned long datum=0;
	330	register unsigned char *ch;
	331	register int count, code;
	332	int status = 1;
	333
	334	datasize = getc(infile);
	335	clear = 1 << datasize;
	336	eoi = clear + 1;
	337	avail = clear + 2;
	338	oldcode = -1;
	339	codesize = datasize + 1;
	340	codemask = (1 << codesize) - 1;
	341	for (code = 0; code < clear; code++) {
	342	prefix[code] = 0;
	343	suffix[code] = code;
	344	}
	345	stackp = stack;
	346	for (count = getc(infile); count > 0; count = getc(infile)) {
	347	fread(buf,1,count,infile);
	348	for (ch=buf; count-- > 0; ch++) {
	349	datum += (unsigned long) *ch << bits;
	350	bits += 8;
	351	while (bits >= codesize) {
	352	code = datum & codemask;
	353	datum >>= codesize;
	354	bits -= codesize;
	355	if (code == eoi) { /* This kludge put in */
356	goto exitloop; /* because some GIF files*/
357	} /* aren't standard */
358	if (!process(code, &fill)) {
359	status = 0;
360	goto exitloop;
361	}
362	}
363	}
364	if (fill >= raster + width*height) {
365	fprintf(stderr, "raster full before eoi code\n");
366	break;
367	}
368	}
369	exitloop:
370	if (fill != raster + width*height) {
371	fprintf(stderr, "warning: wrong rastersize: %ld bytes\n",
372	(long) (fill-raster));
373	fprintf(stderr, " instead of %ld bytes\n",
374	(long) width*height);
375	}
376	return status;
377	}
378
379	/*
380	* process -
381	* Process a compression code. "clear" resets the code table.
382	* Otherwise make a new code table entry, and output the bytes
383	* associated with the code.
384	*/
385	int
386	process(register int code, unsigned char** fill)
387	{
388	int incode;
389	static unsigned char firstchar;
390
391	if (code == clear) {
392	codesize = datasize + 1;
393	codemask = (1 << codesize) - 1;
394	avail = clear + 2;
395	oldcode = -1;
396	return 1;
397	}
398
399	if (oldcode == -1) {
400	(fill)++ = suffix[code];
401	firstchar = oldcode = code;
402	return 1;
403	}
404	if (code > avail) {
405	fprintf(stderr, "code %d too large for %d\n", code, avail);
406	return 0;
407	}
408
409	incode = code;
410	if (code == avail) { /* the first code is always < avail */
411	*stackp++ = firstchar;
412	code = oldcode;
413	}
414	while (code > clear) {
415	*stackp++ = suffix[code];
416	code = prefix[code];
417	}
418
419	*stackp++ = firstchar = suffix[code];
420	prefix[avail] = oldcode;
421	suffix[avail] = firstchar;
422	avail++;
423
424	if (((avail & codemask) == 0) && (avail < 4096)) {
425	codesize++;
426	codemask += avail;
427	}
428	oldcode = incode;
429	do {
430	(fill)++ = *--stackp;
431	} while (stackp > stack);
432	return 1;
433	}
434
435	/*
436	* initcolors -
437	* Convert a color map (local or global) to arrays with R, G and B
438	* values.
439	*
440	*/
441	void
442	initcolors(unsigned char colormap[COLSIZE][3], int ncolors)
443	{
444	register int i;
445
446	for (i = 0; i < ncolors; i++) {
447	red[i] = gamtab[colormap[i][0]];
448	green[i] = gamtab[colormap[i][1]];
449	blue[i] = gamtab[colormap[i][2]];
450	}
451	}
452
453	void
454	rasterize(int interleaved, char* mode)
455	{
456	register unsigned long row;
457	unsigned char *newras;
458	unsigned char *ras;
459	TIFF *tif;
460	tstrip_t strip;
461	tsize_t stripsize;
462
463	if ((newras = (unsigned char) _TIFFmalloc(widthheight+EXTRAFUDGE)) == NULL) {
464	fprintf(stderr, "not enough memory for image\n");
465	return;
466	}
467	#define DRAWSEGMENT(offset, step) { \
468	for (row = offset; row < height; row += step) { \
469	_TIFFmemcpy(newras + row*width, ras, width);\
470	ras += width; \
471	} \
472	}
473	ras = raster;
474	if (interleaved) {
475	DRAWSEGMENT(0, 8);
476	DRAWSEGMENT(4, 8);
477	DRAWSEGMENT(2, 4);
478	DRAWSEGMENT(1, 2);
479	} else
480	DRAWSEGMENT(0, 1);
481	#undef DRAWSEGMENT
482
483	tif = TIFFOpen(imagename, mode);
484	if (!tif) {
485	TIFFError(imagename,"Can not open output image");
486	exit(-1);
487	}
488	TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32) width);
489	TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32) height);
490	TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE);
491	TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
492	TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
493	TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
494	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,
495	rowsperstrip = TIFFDefaultStripSize(tif, rowsperstrip));
496	TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
497	switch (compression) {
498	case COMPRESSION_LZW:
499	case COMPRESSION_DEFLATE:
500	if (predictor != 0)
501	TIFFSetField(tif, TIFFTAG_PREDICTOR, predictor);
502	break;
503	}
504	TIFFSetField(tif, TIFFTAG_COLORMAP, red, green, blue);
505	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
506	strip = 0;
507	stripsize = TIFFStripSize(tif);
508	for (row=0; row<height; row += rowsperstrip) {
80ed523f VZ	509	if (rowsperstrip > height-row) {
	510	rowsperstrip = height-row;
	511	stripsize = TIFFVStripSize(tif, rowsperstrip);
	512	}
8414a40c VZ	513	if (TIFFWriteEncodedStrip(tif, strip, newras+row*width, stripsize) < 0)
	514	break;
	515	strip++;
	516	}
	517	TIFFClose(tif);
	518
	519	_TIFFfree(newras);
	520	}
	521
	522	/* vim: set ts=8 sts=8 sw=8 noet: */
80ed523f VZ	523	/*
	524	* Local Variables:
	525	* mode: c
	526	* c-basic-offset: 8
	527	* fill-column: 78
	528	* End:
	529	*/