ref: fe1eb39db7ae6904924f3ab1f6f9b34416f2eb1b
dir: /sys/src/cmd/postscript/postgif/postgif.c/
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <ctype.h>
#ifdef plan9
#define isascii(c) ((unsigned char)(c)<=0177)
#endif
#include <sys/types.h>
#include <fcntl.h>
#include "comments.h"
#include "gen.h"
#include "path.h"
#include "ext.h"
#define dbprt if (debug) fprintf
char *optnames = "a:c:fglm:n:o:p:x:y:C:E:DG:IL:P:";
char *prologue = POSTGIF; /* default PostScript prologue */
char *formfile = FORMFILE; /* stuff for multiple pages per sheet */
int formsperpage = 1; /* page images on each piece of paper */
int copies = 1; /* and this many copies of each sheet */
int page = 0; /* last page we worked on */
int printed = 0; /* and the number of pages printed */
extern char *malloc();
extern void free();
extern double atof(), pow();
unsigned char ibuf[BUFSIZ];
unsigned char *cmap, *gcmap, *lcmap;
unsigned char *gmap, *ggmap, *lgmap;
unsigned char *pmap;
double gamma;
float cr = 0.3, cg = 0.59, cb = 0.11;
int maplength, gmaplength, lmaplength;
int scrwidth, scrheight;
int gcolormap, lcolormap;
int bitperpixel, background;
int imageleft, imagetop;
int imagewidth, imageheight;
int interlaced, lbitperpixel;
int gray = 0;
int gammaflag = 0;
int negative = 0;
int terminate = 0;
int codesize, clearcode, endcode, curstblsize, pmindex, byteinibuf, bitsleft;
int prefix[4096], suffix[4096], cstbl[4096];
int bburx = -32767, bbury = -32767;
FILE *fp_in = NULL;
FILE *fp_out = stdout;
char *
allocate(int size)
{
char *p;
if ((p = malloc(size)) == NULL) error(FATAL, "not enough memory");
return(p);
}
void
puthex(unsigned char c, FILE *fp)
{
static char hextbl[16] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
};
putc(hextbl[(c >> 4) & 017], fp);
putc(hextbl[c & 017], fp);
}
void
setcolormap(int bp)
{
int i, entries = 1, scale = 1;
unsigned char *p, *q;
for (i = 0; i < bp; i++) entries *= 2;
for (i = 0; i < 8 - bp; i++) scale *= 2;
gcmap = (unsigned char *) allocate(entries*3);
ggmap = (unsigned char *) allocate(entries);
gmaplength = entries;
for (i = 0, p = gcmap, q = ggmap; i < 256; i += scale, p += 3, q++) {
if (negative) {
*p = 255 - i; p[1] = *p; p[2] = *p;
*q = *p;
}
else {
*p = i; p[1] = i; p[2] = i;
*q = i;
}
}
if (gammaflag)
for (i = 0, p = gcmap; i < 256; i += scale, p += 3) {
*p = (unsigned char) (pow((double) *p/256.0, gamma)*256);
p[1] = *p; p[2] = *p;
}
dbprt(stderr,"default color map:\n");
for (i = 0; i < entries*3; i += 3)
dbprt(stderr, "%d, %d, %d\n", gcmap[i], gcmap[i+1], gcmap[i+2]);
}
void
readgcolormap(int bp)
{
int i, entries = 1;
unsigned char *p, *q;
for (i = 0; i < bp; i++) entries *= 2;
gcmap = (unsigned char *) allocate(entries*3);
ggmap = (unsigned char *) allocate(entries);
gmaplength = entries;
fread(gcmap, sizeof(*gcmap), entries*3, fp_in);
if (negative)
for (i = 0, p = gcmap; i < entries*3; i++, p++) *p = 255 - *p;
for (i = 0, p = gcmap, q = ggmap; i < entries; i++, p += 3, q++)
*q = cr*(int)p[0] + cg*(int)p[1] + cb*(int)p[2] + 0.5;
if (gammaflag)
for (i = 0, p = gcmap; i < entries*3; i++, p++)
*p = (unsigned char) (pow((double) *p/256.0, gamma)*256);
dbprt(stderr,"global color map:\n");
for (i = 0; i < entries*3; i += 3)
dbprt(stderr, "%d, %d, %d\n", gcmap[i], gcmap[i+1], gcmap[i+2]);
}
void
readlcolormap(int bp)
{
int i, entries = 1;
unsigned char *p, *q;
for (i = 0; i < bp; i++) entries *= 2;
lcmap = (unsigned char *) allocate(entries*3);
lgmap = (unsigned char *) allocate(entries);
lmaplength = entries;
fread(lcmap, sizeof(*lcmap), entries*3, fp_in);
if (negative)
for (i = 0, p = lcmap; i < entries*3; i++, p++) *p = 255 - *p;
for (i = 0, p = lcmap, q = lgmap; i < entries; i++, p += 3, q++)
*q = cr*(int)p[0] + cg*(int)p[1] + cb*(int)p[2] + 0.5;
if (gammaflag)
for (i = 0, p = lcmap; i < entries*3; i++, p++)
*p = (unsigned char) (pow((double) *p/256.0, gamma)*256);
dbprt(stderr,"local color map:\n");
for (i = 0; i < entries*3; i += 3)
dbprt(stderr, "%d, %d, %d\n", lcmap[i], lcmap[i+1], lcmap[i+2]);
}
void
initstbl(void)
{
int i, entries = 1, *p, *s;
for (i = 0; i < codesize; i++) entries *= 2;
clearcode = entries;
endcode = clearcode + 1;
for (i = 0, p = prefix, s = suffix; i <= endcode; i++, p++, s++) {
*p = endcode;
*s = i;
}
curstblsize = endcode + 1;
pmindex = 0;
byteinibuf = 0;
bitsleft = 0;
}
int
nextbyte(void)
{
static ibufindex;
if (byteinibuf) {
byteinibuf--;
ibufindex++;
}
else {
fread(ibuf, sizeof(*ibuf), 1, fp_in);
byteinibuf = ibuf[0];
dbprt(stderr, "byte count: %d\n", byteinibuf);
if (byteinibuf) fread(ibuf, sizeof(*ibuf), byteinibuf, fp_in);
else error(FATAL, "encounter zero byte count block before end code");
ibufindex = 0;
byteinibuf--;
ibufindex++;
}
return(ibuf[ibufindex-1]);
}
int masktbl[25] = {
0, 01, 03, 07, 017, 037, 077, 0177, 0377, 0777, 01777, 03777, 07777,
017777, 037777, 077777, 0177777, 0377777, 0777777, 01777777, 03777777,
07777777, 017777777, 037777777, 077777777
};
int
getcode(void)
{
int cs, c;
static int oldc;
if (curstblsize < 4096) cs = cstbl[curstblsize];
else cs = 12;
while (bitsleft < cs) {
oldc = (oldc & masktbl[bitsleft]) | ((nextbyte() & 0377) << bitsleft);
bitsleft += 8;
}
c = oldc & masktbl[cs];
oldc = oldc >> cs;
bitsleft -= cs;
/* dbprt(stderr, "code: %d %d %d\n", curstblsize, cs, c); */
return(c);
}
void
putcode(int c)
{
if (prefix[c] != endcode) {
putcode(prefix[c]);
pmap[pmindex] = suffix[c];
pmindex++;
}
else {
pmap[pmindex] = suffix[c];
pmindex++;
}
}
int
firstof(int c)
{
while (prefix[c] != endcode) c = prefix[c];
return(suffix[c]);
}
void
writeimage(void)
{
int i, j, k;
dbprt(stderr, "pmindex: %d\n", pmindex);
fputs("save\n", fp_out);
fprintf(fp_out, "/codestr %d string def\n", imagewidth);
if (!gray) {
fprintf(fp_out, "/colortbl currentfile %d string readhexstring\n",
maplength*3);
for (i = 0; i < maplength; i++) puthex(cmap[i], fp_out);
fputs("\n", fp_out);
for (i = maplength ; i < maplength*2; i++) puthex(cmap[i], fp_out);
fputs("\n", fp_out);
for (i = maplength*2 ; i < maplength*3; i++) puthex(cmap[i], fp_out);
fputs("\npop def\n", fp_out);
fprintf(fp_out, "/graytbl currentfile %d string readhexstring\n",
maplength);
for (i = 0; i < maplength; i++) puthex(gmap[i], fp_out);
fputs("\npop def\n", fp_out);
}
fprintf(fp_out, "%s %d %d %d %d gifimage\n",
gray ? "true" : "false", imagewidth, imageheight,
scrwidth - imageleft - imagewidth, scrheight - imagetop - imageheight);
if (gray) {
if (interlaced) {
int *iltbl;
iltbl = (int *) allocate(imageheight*sizeof(int));
j = 0;
for (i = 0; i < imageheight; i += 8) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass1: %d\n", j);
for (i = 4; i < imageheight; i += 8) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass2: %d\n", j);
for (i = 2; i < imageheight; i += 4) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass3: %d\n", j);
for (i = 1; i < imageheight; i += 2) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass4: %d\n", j);
for (i = 0; i < imageheight; i++) {
k = iltbl[i];
for (j = 0; j < imagewidth; j++, k++)
puthex(gmap[pmap[k]], fp_out);
fputs("\n", fp_out);
}
}
else {
for (i = 0, k = 0; i < imageheight; i++) {
for (j = 0; j < imagewidth; j++, k++)
puthex(gmap[pmap[k]], fp_out);
fputs("\n", fp_out);
}
}
}
else {
if (interlaced) {
int *iltbl;
iltbl = (int *) allocate(imageheight*sizeof(int));
j = 0;
for (i = 0; i < imageheight; i += 8) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass1: %d\n", j);
for (i = 4; i < imageheight; i += 8) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass2: %d\n", j);
for (i = 2; i < imageheight; i += 4) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass3: %d\n", j);
for (i = 1; i < imageheight; i += 2) {
iltbl[i] = j;
j += imagewidth;
}
dbprt(stderr, "pass4: %d\n", j);
for (i = 0; i < imageheight; i++) {
k = iltbl[i];
for (j = 0; j < imagewidth; j++, k++) puthex(pmap[k], fp_out);
fputs("\n", fp_out);
}
}
else {
for (i = 0, k = 0; i < imageheight; i++) {
for (j = 0; j < imagewidth; j++, k++) puthex(pmap[k], fp_out);
fputs("\n", fp_out);
}
}
}
fputs("restore\n", fp_out);
}
void
readimage(void)
{
int bytecount, zerobytecount = 0;
int code, oldcode;
fread(ibuf, sizeof(*ibuf), 9, fp_in);
imageleft = ibuf[0] + 256*ibuf[1];
imagetop = ibuf[2] + 256*ibuf[3];
imagewidth = ibuf[4] + 256*ibuf[5];
imageheight = ibuf[6] + 256*ibuf[7];
lcolormap = ibuf[8] & 0200;
interlaced = ibuf[8] & 0100;
lbitperpixel = (ibuf[8] & 07) + 1;
dbprt(stderr, "imageleft: %d\n", imageleft);
dbprt(stderr, "imagetop: %d\n", imagetop);
dbprt(stderr, "imagewidth: %d\n", imagewidth);
dbprt(stderr, "imgaeheight: %d\n", imageheight);
dbprt(stderr, "lcolormap: %d\n", lcolormap ? 1 : 0);
dbprt(stderr, "interlaced: %d\n", interlaced ? 1 : 0);
dbprt(stderr, "lbitperpixel: %d\n", lbitperpixel);
if (lcolormap) {
readlcolormap(lbitperpixel);
cmap = lcmap;
gmap = lgmap;
maplength = lmaplength;
}
dbprt(stderr, "start reading raster data\n");
fread(ibuf, sizeof(*ibuf), 1, fp_in);
codesize = ibuf[0];
dbprt(stderr, "codesize: %d\n", codesize);
pmap = (unsigned char *) allocate(imagewidth*imageheight);
initstbl();
while ((code = getcode()) != endcode) {
if (code == clearcode) {
curstblsize = endcode + 1;
code = getcode();
putcode(code);
oldcode = code;
}
else if (code < curstblsize) {
putcode(code);
prefix[curstblsize] = oldcode;
suffix[curstblsize] = firstof(code);
curstblsize++;
oldcode = code;
}
else {
if (code != curstblsize) error(FATAL, "code out of order");
prefix[curstblsize] = oldcode;
suffix[curstblsize] = firstof(oldcode);
curstblsize++;
putcode(curstblsize-1);
oldcode = code;
}
}
dbprt(stderr, "finish reading raster data\n");
/* read the rest of the raster data */
do {
fread(ibuf, sizeof(*ibuf), 1, fp_in);
bytecount = ibuf[0];
dbprt(stderr, "byte count: %d\n", bytecount);
if (bytecount) fread(ibuf, sizeof(*ibuf), bytecount, fp_in);
else zerobytecount = 1;
} while (!zerobytecount);
writeimage();
if (lcolormap) {
cmap = gcmap;
gmap = ggmap;
maplength = gmaplength;
free(lcmap);
free(lgmap);
}
}
void
readextensionblock(void)
{
int functioncode, bytecount, zerobytecount = 0;
fread(ibuf, sizeof(*ibuf), 1, fp_in);
functioncode = ibuf[0];
dbprt(stderr, "function code: %d\n", functioncode);
do {
fread(ibuf, sizeof(*ibuf), 1, fp_in);
bytecount = ibuf[0];
dbprt(stderr, "byte count: %d\n", bytecount);
if (bytecount) fread(ibuf, sizeof(*ibuf), bytecount, fp_in);
else zerobytecount = 1;
} while (!zerobytecount);
}
void
writebgscr(void)
{
fprintf(fp_out, "%s %d %d\n", PAGE, page, printed+1);
fputs("/saveobj save def\n", fp_out);
fprintf(fp_out, "%s: %d %d %d %d\n",
"%%PageBoundingBox", 0, 0, scrwidth, scrheight);
if (scrwidth > bburx) bburx = scrwidth;
if (scrheight > bbury) bbury = scrheight;
fprintf(fp_out, "%d %d gifscreen\n", scrwidth, scrheight);
}
void
writeendscr(void)
{
if ( fp_out == stdout ) printed++;
fputs("showpage\n", fp_out);
fputs("saveobj restore\n", fp_out);
fprintf(fp_out, "%s %d %d\n", ENDPAGE, page, printed);
}
void
redirect(int pg)
{
static FILE *fp_null = NULL; /* if output is turned off */
if ( pg >= 0 && in_olist(pg) == ON )
fp_out = stdout;
else if ( (fp_out = fp_null) == NULL )
fp_out = fp_null = fopen("/dev/null", "w");
}
void
readgif(void)
{
int i, j, k;
for (i = 0, j = 1, k = 0; i < 13; i++) {
for (; k < j; k++) cstbl[k] = i;
j *= 2;
}
fread(ibuf, sizeof(*ibuf), 6, fp_in);
dbprt(stderr, "%.6s\n", ibuf);
if (strncmp((char *)ibuf, "GIF87a", 6) != 0) {
fread(ibuf, sizeof(*ibuf), 122, fp_in);
fread(ibuf, sizeof(*ibuf), 6, fp_in);
dbprt(stderr, "%.6s\n", ibuf);
if (strncmp((char *)ibuf, "GIF87a", 6) != 0)
error(FATAL, "wrong GIF signature");
}
fread(ibuf, sizeof(*ibuf), 7, fp_in);
scrwidth = ibuf[0] + 256*ibuf[1];
scrheight = ibuf[2] + 256*ibuf[3];
gcolormap = ibuf[4] & 0200;
bitperpixel = (ibuf[4] & 07) + 1;
background = ibuf[5];
dbprt(stderr, "scrwidth: %d\n", scrwidth);
dbprt(stderr, "scrheight: %d\n", scrheight);
dbprt(stderr, "gcolormap: %d\n", gcolormap ? 1 : 0);
dbprt(stderr, "bitperpixel: %d\n", bitperpixel);
dbprt(stderr, "background: %d\n", background);
if (ibuf[6] != 0) error(FATAL, "wrong screen descriptor");
if (gcolormap) readgcolormap(bitperpixel);
else setcolormap(bitperpixel);
redirect(++page);
writebgscr();
cmap = gcmap;
gmap = ggmap;
maplength = gmaplength;
do {
fread(ibuf, sizeof(*ibuf), 1, fp_in);
if (ibuf[0] == ',') readimage();
else if (ibuf[0] == ';') terminate = 1;
else if (ibuf[0] == '!') readextensionblock();
else
error(FATAL, "wrong image separator character or wrong GIF terminator");
} while (!terminate);
writeendscr();
free(gcmap);
free(ggmap);
}
void
init_signals(void)
{
if ( signal(SIGINT, interrupt) == SIG_IGN ) {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
}
else {
signal(SIGHUP, interrupt);
signal(SIGQUIT, interrupt);
}
signal(SIGTERM, interrupt);
}
void
header(void)
{
int ch; /* return value from getopt() */
int old_optind = optind; /* for restoring optind - should be 1 */
while ( (ch = getopt(argc, argv, optnames)) != EOF )
if ( ch == 'L' )
prologue = optarg;
else if ( ch == '?' )
error(FATAL, "");
optind = old_optind; /* get ready for option scanning */
fprintf(stdout, "%s", CONFORMING);
fprintf(stdout, "%s %s\n", VERSION, PROGRAMVERSION);
fprintf(stdout, "%s %s\n", BOUNDINGBOX, ATEND);
fprintf(stdout, "%s %s\n", PAGES, ATEND);
fprintf(stdout, "%s", ENDCOMMENTS);
if ( cat(prologue) == FALSE )
error(FATAL, "can't read %s", prologue);
fprintf(stdout, "%s", ENDPROLOG);
fprintf(stdout, "%s", BEGINSETUP);
fprintf(stdout, "mark\n");
}
void
options(void)
{
int ch; /* return value from getopt() */
while ( (ch = getopt(argc, argv, optnames)) != EOF ) {
switch ( ch ) {
case 'a': /* aspect ratio */
fprintf(stdout, "/aspectratio %s def\n", optarg);
break;
case 'c': /* copies */
copies = atoi(optarg);
fprintf(stdout, "/#copies %s store\n", optarg);
break;
case 'f':
negative = TRUE;
break;
case 'g':
gray = TRUE;
break;
case 'l':
fprintf(stdout, "/alignment true def\n");
break;
case 'm': /* magnification */
fprintf(stdout, "/magnification %s def\n", optarg);
break;
case 'n': /* forms per page */
formsperpage = atoi(optarg);
fprintf(stdout, "%s %s\n", FORMSPERPAGE, optarg);
fprintf(stdout, "/formsperpage %s def\n", optarg);
break;
case 'o': /* output page list */
out_list(optarg);
break;
case 'p': /* landscape or portrait mode */
if ( *optarg == 'l' )
fprintf(stdout, "/landscape true def\n");
else fprintf(stdout, "/landscape false def\n");
break;
case 'x': /* shift things horizontally */
fprintf(stdout, "/xoffset %s def\n", optarg);
break;
case 'y': /* and vertically on the page */
fprintf(stdout, "/yoffset %s def\n", optarg);
break;
case 'C': /* copy file straight to output */
if ( cat(optarg) == FALSE )
error(FATAL, "can't read %s", optarg);
break;
case 'E': /* text font encoding - unnecessary */
fontencoding = optarg;
break;
case 'D': /* debug flag */
debug = ON;
break;
case 'G':
gammaflag = ON;
gamma = atof(optarg);
break;
case 'I': /* ignore FATAL errors */
ignore = ON;
break;
case 'L': /* PostScript prologue file */
prologue = optarg;
break;
case 'P': /* PostScript pass through */
fprintf(stdout, "%s\n", optarg);
break;
case '?': /* don't understand the option */
error(FATAL, "");
break;
default: /* don't know what to do for ch */
error(FATAL, "missing case for option %c\n", ch);
break;
}
}
argc -= optind; /* get ready for non-option args */
argv += optind;
}
void
setup(void)
{
/*setencoding(fontencoding);*/
fprintf(stdout, "setup\n");
if ( formsperpage > 1 ) { /* followed by stuff for multiple pages
*/
if ( cat(formfile) == FALSE )
error(FATAL, "can't read %s", formfile);
fprintf(stdout, "%d setupforms\n", formsperpage);
} /* End if */
fprintf(stdout, "%s", ENDSETUP);
}
void
arguments(void)
{
if ( argc < 1 ) {
fp_in = stdin;
readgif();
}
else { /* at least one argument is left */
while ( argc > 0 ) {
if ( strcmp(*argv, "-") == 0 )
fp_in = stdin;
else if ( (fp_in = fopen(*argv, "r")) == NULL )
error(FATAL, "can't open %s", *argv);
readgif();
if ( fp_in != stdin )
fclose(fp_in);
argc--;
argv++;
}
}
}
void
done(void)
{
fprintf(stdout, "%s", TRAILER);
fprintf(stdout, "done\n");
fprintf(stdout, "%s 0 0 %d %d\n", BOUNDINGBOX, bburx, bbury);
fprintf(stdout, "%s %d\n", PAGES, printed);
}
main(int agc, char *agv[])
{
argc = agc;
argv = agv;
prog_name = argv[0];
init_signals();
header();
options();
setup();
arguments();
done();
exit(0);
}