1 /*
2 * gd_gd2.c
3 *
4 * Implements the I/O and support for the GD2 format.
5 *
6 * Changing the definition of GD2_DBG (below) will cause copious messages
7 * to be displayed while it processes requests.
8 *
9 * Designed, Written & Copyright 1999, Philip Warner.
10 *
11 */
12
13 #include <stdio.h>
14 #include <errno.h>
15 #include <math.h>
16 #include <string.h>
17 #include <stdlib.h>
18 #include "gd.h"
19 #include "gd_errors.h"
20 #include "gdhelpers.h"
21
22 #include <zlib.h>
23
24 #define TRUE 1
25 #define FALSE 0
26
27 /* 2.11: not part of the API, as the save routine can figure it out
28 * from im->trueColor, and the load routine doesn't need to tell
29 * the end user the saved format. NOTE: adding 2 is assumed
30 * to result in the correct format value for truecolor!
31 */
32 #define GD2_FMT_TRUECOLOR_RAW 3
33 #define GD2_FMT_TRUECOLOR_COMPRESSED 4
34
35 #define gd2_compressed(fmt) (((fmt) == GD2_FMT_COMPRESSED) || ((fmt) == GD2_FMT_TRUECOLOR_COMPRESSED))
36 #define gd2_truecolor(fmt) (((fmt) == GD2_FMT_TRUECOLOR_RAW) || ((fmt) == GD2_FMT_TRUECOLOR_COMPRESSED))
37
38 /* Use this for commenting out debug-print statements. */
39 /* Just use the first '#define' to allow all the prints... */
40 /* #define GD2_DBG(s) (s) */
41 #define GD2_DBG(s)
42
43 typedef struct
44 {
45 int offset;
46 int size;
47 } t_chunk_info;
48
49 extern int _gdGetColors(gdIOCtx * in, gdImagePtr im, int gd2xFlag);
50 extern void _gdPutColors(gdImagePtr im, gdIOCtx * out);
51
52 /* */
53 /* Read the extra info in the gd2 header. */
54 /* */
_gd2GetHeader(gdIOCtxPtr in,int * sx,int * sy,int * cs,int * vers,int * fmt,int * ncx,int * ncy,t_chunk_info ** chunkIdx)55 static int _gd2GetHeader(gdIOCtxPtr in, int *sx, int *sy, int *cs, int *vers, int *fmt, int *ncx, int *ncy, t_chunk_info ** chunkIdx)
56 {
57 int i;
58 int ch;
59 char id[5];
60 t_chunk_info *cidx;
61 int sidx;
62 int nc;
63
64 GD2_DBG(gd_error("Reading gd2 header info"));
65
66 for (i = 0; i < 4; i++) {
67 ch = gdGetC(in);
68 if (ch == EOF) {
69 goto fail1;
70 }
71 id[i] = ch;
72 }
73 id[4] = 0;
74
75 GD2_DBG(gd_error("Got file code: %s", id));
76
77 /* Equiv. of 'magick'. */
78 if (strcmp(id, GD2_ID) != 0) {
79 GD2_DBG(gd_error("Not a valid gd2 file"));
80 goto fail1;
81 }
82
83 /* Version */
84 if (gdGetWord(vers, in) != 1) {
85 goto fail1;
86 }
87 GD2_DBG(gd_error("Version: %d", *vers));
88
89 if ((*vers != 1) && (*vers != 2)) {
90 GD2_DBG(gd_error("Bad version: %d", *vers));
91 goto fail1;
92 }
93
94 /* Image Size */
95 if (!gdGetWord(sx, in)) {
96 GD2_DBG(gd_error("Could not get x-size"));
97 goto fail1;
98 }
99 if (!gdGetWord(sy, in)) {
100 GD2_DBG(gd_error("Could not get y-size"));
101 goto fail1;
102 }
103 GD2_DBG(gd_error("Image is %dx%d", *sx, *sy));
104
105 /* Chunk Size (pixels, not bytes!) */
106 if (gdGetWord(cs, in) != 1) {
107 goto fail1;
108 }
109 GD2_DBG(gd_error("ChunkSize: %d", *cs));
110
111 if ((*cs < GD2_CHUNKSIZE_MIN) || (*cs > GD2_CHUNKSIZE_MAX)) {
112 GD2_DBG(gd_error("Bad chunk size: %d", *cs));
113 goto fail1;
114 }
115
116 /* Data Format */
117 if (gdGetWord(fmt, in) != 1) {
118 goto fail1;
119 }
120 GD2_DBG(gd_error("Format: %d", *fmt));
121
122 if ((*fmt != GD2_FMT_RAW) && (*fmt != GD2_FMT_COMPRESSED) && (*fmt != GD2_FMT_TRUECOLOR_RAW) && (*fmt != GD2_FMT_TRUECOLOR_COMPRESSED)) {
123 GD2_DBG(gd_error("Bad data format: %d", *fmt));
124 goto fail1;
125 }
126
127 /* # of chunks wide */
128 if (gdGetWord(ncx, in) != 1) {
129 goto fail1;
130 }
131 GD2_DBG(gd_error("%d Chunks Wide", *ncx));
132
133 /* # of chunks high */
134 if (gdGetWord(ncy, in) != 1) {
135 goto fail1;
136 }
137 GD2_DBG(gd_error("%d Chunks vertically", *ncy));
138
139 if (gd2_compressed(*fmt)) {
140 if (*ncx <= 0 || *ncy <= 0 || *ncx > INT_MAX / *ncy) {
141 GD2_DBG(printf ("Illegal chunk counts: %d * %d\n", *ncx, *ncy));
142 goto fail1;
143 }
144 nc = (*ncx) * (*ncy);
145 GD2_DBG(gd_error("Reading %d chunk index entries", nc));
146 if (overflow2(sizeof(t_chunk_info), nc)) {
147 goto fail1;
148 }
149 sidx = sizeof(t_chunk_info) * nc;
150 if (sidx <= 0) {
151 goto fail1;
152 }
153 cidx = gdCalloc(sidx, 1);
154 if (cidx == NULL) {
155 goto fail1;
156 }
157
158 for (i = 0; i < nc; i++) {
159 if (gdGetInt(&cidx[i].offset, in) != 1) {
160 gdFree(cidx);
161 goto fail1;
162 }
163 if (gdGetInt(&cidx[i].size, in) != 1) {
164 gdFree(cidx);
165 goto fail1;
166 }
167 if (cidx[i].offset < 0 || cidx[i].size < 0) {
168 gdFree(cidx);
169 goto fail1;
170 }
171 }
172 *chunkIdx = cidx;
173 }
174
175 GD2_DBG(gd_error("gd2 header complete"));
176
177 return 1;
178
179 fail1:
180 return 0;
181 }
182
_gd2CreateFromFile(gdIOCtxPtr in,int * sx,int * sy,int * cs,int * vers,int * fmt,int * ncx,int * ncy,t_chunk_info ** cidx)183 static gdImagePtr _gd2CreateFromFile (gdIOCtxPtr in, int *sx, int *sy, int *cs, int *vers, int *fmt, int *ncx, int *ncy, t_chunk_info ** cidx)
184 {
185 gdImagePtr im;
186
187 if (_gd2GetHeader (in, sx, sy, cs, vers, fmt, ncx, ncy, cidx) != 1) {
188 GD2_DBG(gd_error("Bad GD2 header"));
189 goto fail1;
190 }
191
192 if (gd2_truecolor(*fmt)) {
193 im = gdImageCreateTrueColor(*sx, *sy);
194 } else {
195 im = gdImageCreate(*sx, *sy);
196 }
197 if (im == NULL) {
198 GD2_DBG(gd_error("Could not create gdImage"));
199 goto fail2;
200 }
201
202 if (!_gdGetColors(in, im, (*vers) == 2)) {
203 GD2_DBG(gd_error("Could not read color palette"));
204 goto fail3;
205 }
206 GD2_DBG(gd_error("Image palette completed: %d colours", im->colorsTotal));
207
208 return im;
209
210 fail3:
211 gdImageDestroy(im);
212 fail2:
213 gdFree(*cidx);
214 fail1:
215 return 0;
216 }
217
_gd2ReadChunk(int offset,char * compBuf,int compSize,char * chunkBuf,uLongf * chunkLen,gdIOCtx * in)218 static int _gd2ReadChunk (int offset, char *compBuf, int compSize, char *chunkBuf, uLongf * chunkLen, gdIOCtx * in)
219 {
220 int zerr;
221
222 if (gdTell(in) != offset) {
223 GD2_DBG(gd_error("Positioning in file to %d", offset));
224 gdSeek(in, offset);
225 } else {
226 GD2_DBG(gd_error("Already Positioned in file to %d", offset));
227 }
228
229 /* Read and uncompress an entire chunk. */
230 GD2_DBG(gd_error("Reading file"));
231 if (gdGetBuf(compBuf, compSize, in) != compSize) {
232 return FALSE;
233 }
234 GD2_DBG(gd_error("Got %d bytes. Uncompressing into buffer of %d bytes", compSize, (int)*chunkLen));
235 zerr = uncompress((unsigned char *) chunkBuf, chunkLen, (unsigned char *) compBuf, compSize);
236 if (zerr != Z_OK) {
237 GD2_DBG(gd_error("Error %d from uncompress", zerr));
238 return FALSE;
239 }
240 GD2_DBG(gd_error("Got chunk"));
241
242 return TRUE;
243 }
244
gdImageCreateFromGd2(FILE * inFile)245 gdImagePtr gdImageCreateFromGd2 (FILE * inFile)
246 {
247 gdIOCtx *in = gdNewFileCtx(inFile);
248 gdImagePtr im;
249
250 im = gdImageCreateFromGd2Ctx(in);
251
252 in->gd_free(in);
253
254 return im;
255 }
256
gdImageCreateFromGd2Ptr(int size,void * data)257 gdImagePtr gdImageCreateFromGd2Ptr (int size, void *data)
258 {
259 gdImagePtr im;
260 gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
261 im = gdImageCreateFromGd2Ctx(in);
262 in->gd_free(in);
263
264 return im;
265 }
266
gdImageCreateFromGd2Ctx(gdIOCtxPtr in)267 gdImagePtr gdImageCreateFromGd2Ctx (gdIOCtxPtr in)
268 {
269 int sx, sy;
270 int i;
271 int ncx, ncy, nc, cs, cx, cy;
272 int x, y, ylo, yhi, xlo, xhi;
273 int vers, fmt;
274 t_chunk_info *chunkIdx = NULL; /* So we can gdFree it with impunity. */
275 unsigned char *chunkBuf = NULL; /* So we can gdFree it with impunity. */
276 int chunkNum = 0;
277 int chunkMax = 0;
278 uLongf chunkLen;
279 int chunkPos = 0;
280 int compMax = 0;
281 int bytesPerPixel;
282 char *compBuf = NULL; /* So we can gdFree it with impunity. */
283
284 gdImagePtr im;
285
286 /* Get the header */
287 if (!(im = _gd2CreateFromFile(in, &sx, &sy, &cs, &vers, &fmt, &ncx, &ncy, &chunkIdx))) {
288 return 0;
289 }
290
291 bytesPerPixel = im->trueColor ? 4 : 1;
292 nc = ncx * ncy;
293
294 if (gd2_compressed(fmt)) {
295 /* Find the maximum compressed chunk size. */
296 compMax = 0;
297 for (i = 0; (i < nc); i++) {
298 if (chunkIdx[i].size > compMax) {
299 compMax = chunkIdx[i].size;
300 }
301 }
302 compMax++;
303
304 /* Allocate buffers */
305 chunkMax = cs * bytesPerPixel * cs;
306 if (chunkMax <= 0) {
307 return 0;
308 }
309 chunkBuf = gdCalloc(chunkMax, 1);
310 compBuf = gdCalloc(compMax, 1);
311
312 GD2_DBG(gd_error("Largest compressed chunk is %d bytes", compMax));
313 }
314
315 /* Read the data... */
316 for (cy = 0; (cy < ncy); cy++) {
317 for (cx = 0; (cx < ncx); cx++) {
318 ylo = cy * cs;
319 yhi = ylo + cs;
320 if (yhi > im->sy) {
321 yhi = im->sy;
322 }
323
324 GD2_DBG(gd_error("Processing Chunk %d (%d, %d), y from %d to %d", chunkNum, cx, cy, ylo, yhi));
325
326 if (gd2_compressed(fmt)) {
327 chunkLen = chunkMax;
328
329 if (!_gd2ReadChunk(chunkIdx[chunkNum].offset, compBuf, chunkIdx[chunkNum].size, (char *) chunkBuf, &chunkLen, in)) {
330 GD2_DBG(gd_error("Error reading comproessed chunk"));
331 goto fail2;
332 }
333
334 chunkPos = 0;
335 }
336
337 for (y = ylo; (y < yhi); y++) {
338 xlo = cx * cs;
339 xhi = xlo + cs;
340 if (xhi > im->sx) {
341 xhi = im->sx;
342 }
343
344 if (!gd2_compressed(fmt)) {
345 for (x = xlo; x < xhi; x++) {
346 if (im->trueColor) {
347 if (!gdGetInt(&im->tpixels[y][x], in)) {
348 gd_error("gd2: EOF while reading\n");
349 gdImageDestroy(im);
350 return NULL;
351 }
352 } else {
353 int ch;
354 if (!gdGetByte(&ch, in)) {
355 gd_error("gd2: EOF while reading\n");
356 gdImageDestroy(im);
357 return NULL;
358 }
359 im->pixels[y][x] = ch;
360 }
361 }
362 } else {
363 for (x = xlo; x < xhi; x++) {
364 if (im->trueColor) {
365 /* 2.0.1: work around a gcc bug by being verbose. TBB */
366 int a = chunkBuf[chunkPos++] << 24;
367 int r = chunkBuf[chunkPos++] << 16;
368 int g = chunkBuf[chunkPos++] << 8;
369 int b = chunkBuf[chunkPos++];
370 im->tpixels[y][x] = a + r + g + b;
371 } else {
372 im->pixels[y][x] = chunkBuf[chunkPos++];
373 }
374 }
375 }
376 }
377 chunkNum++;
378 }
379 }
380
381 GD2_DBG(gd_error("Freeing memory"));
382
383 if (chunkBuf) {
384 gdFree(chunkBuf);
385 }
386 if (compBuf) {
387 gdFree(compBuf);
388 }
389 if (chunkIdx) {
390 gdFree(chunkIdx);
391 }
392
393 GD2_DBG(gd_error("Done"));
394
395 return im;
396
397 fail2:
398 gdImageDestroy(im);
399 if (chunkBuf) {
400 gdFree(chunkBuf);
401 }
402 if (compBuf) {
403 gdFree(compBuf);
404 }
405 if (chunkIdx) {
406 gdFree(chunkIdx);
407 }
408
409 return 0;
410 }
411
gdImageCreateFromGd2PartPtr(int size,void * data,int srcx,int srcy,int w,int h)412 gdImagePtr gdImageCreateFromGd2PartPtr (int size, void *data, int srcx, int srcy, int w, int h)
413 {
414 gdImagePtr im;
415 gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
416 im = gdImageCreateFromGd2PartCtx(in, srcx, srcy, w, h);
417 in->gd_free(in);
418
419 return im;
420 }
421
gdImageCreateFromGd2Part(FILE * inFile,int srcx,int srcy,int w,int h)422 gdImagePtr gdImageCreateFromGd2Part (FILE * inFile, int srcx, int srcy, int w, int h)
423 {
424 gdImagePtr im;
425 gdIOCtx *in = gdNewFileCtx(inFile);
426
427 im = gdImageCreateFromGd2PartCtx(in, srcx, srcy, w, h);
428
429 in->gd_free(in);
430
431 return im;
432 }
433
gdImageCreateFromGd2PartCtx(gdIOCtx * in,int srcx,int srcy,int w,int h)434 gdImagePtr gdImageCreateFromGd2PartCtx (gdIOCtx * in, int srcx, int srcy, int w, int h)
435 {
436 int scx, scy, ecx, ecy, fsx, fsy;
437 int nc, ncx, ncy, cs, cx, cy;
438 int x, y, ylo, yhi, xlo, xhi;
439 int dstart, dpos;
440 int i;
441 /* 2.0.12: unsigned is correct; fixes problems with color munging. Thanks to Steven Brown. */
442 unsigned int ch;
443 int vers, fmt;
444 t_chunk_info *chunkIdx = NULL;
445 unsigned char *chunkBuf = NULL;
446 int chunkNum;
447 int chunkMax = 0;
448 uLongf chunkLen;
449 int chunkPos = 0;
450 int compMax;
451 char *compBuf = NULL;
452
453 gdImagePtr im;
454
455 if (w<1 || h <1) {
456 return 0;
457 }
458
459 /* The next few lines are basically copied from gd2CreateFromFile
460 * we change the file size, so don't want to use the code directly.
461 * but we do need to know the file size.
462 */
463 if (_gd2GetHeader(in, &fsx, &fsy, &cs, &vers, &fmt, &ncx, &ncy, &chunkIdx) != 1) {
464 goto fail1;
465 }
466
467 GD2_DBG(gd_error("File size is %dx%d", fsx, fsy));
468
469 /* This is the difference - make a file based on size of chunks. */
470 if (gd2_truecolor(fmt)) {
471 im = gdImageCreateTrueColor(w, h);
472 } else {
473 im = gdImageCreate(w, h);
474 }
475 if (im == NULL) {
476 goto fail1;
477 }
478
479 if (!_gdGetColors(in, im, vers == 2)) {
480 goto fail2;
481 }
482 GD2_DBG(gd_error("Image palette completed: %d colours", im->colorsTotal));
483
484 /* Process the header info */
485 nc = ncx * ncy;
486
487 if (gd2_compressed(fmt)) {
488 /* Find the maximum compressed chunk size. */
489 compMax = 0;
490 for (i = 0; (i < nc); i++) {
491 if (chunkIdx[i].size > compMax) {
492 compMax = chunkIdx[i].size;
493 }
494 }
495 compMax++;
496
497 if (im->trueColor) {
498 chunkMax = cs * cs * 4;
499 } else {
500 chunkMax = cs * cs;
501 }
502 if (chunkMax <= 0) {
503 goto fail2;
504 }
505
506 chunkBuf = gdCalloc(chunkMax, 1);
507 compBuf = gdCalloc(compMax, 1);
508 }
509
510 /* Work out start/end chunks */
511 scx = srcx / cs;
512 scy = srcy / cs;
513 if (scx < 0) {
514 scx = 0;
515 }
516 if (scy < 0) {
517 scy = 0;
518 }
519
520 ecx = (srcx + w) / cs;
521 ecy = (srcy + h) / cs;
522 if (ecx >= ncx) {
523 ecx = ncx - 1;
524 }
525 if (ecy >= ncy) {
526 ecy = ncy - 1;
527 }
528
529 /* Remember file position of image data. */
530 dstart = gdTell(in);
531 GD2_DBG(gd_error("Data starts at %d", dstart));
532
533 /* Loop through the chunks. */
534 for (cy = scy; (cy <= ecy); cy++) {
535 ylo = cy * cs;
536 yhi = ylo + cs;
537 if (yhi > fsy) {
538 yhi = fsy;
539 }
540
541 for (cx = scx; cx <= ecx; cx++) {
542
543 xlo = cx * cs;
544 xhi = xlo + cs;
545 if (xhi > fsx) {
546 xhi = fsx;
547 }
548
549 GD2_DBG(gd_error("Processing Chunk (%d, %d), from %d to %d", cx, cy, ylo, yhi));
550
551 if (!gd2_compressed(fmt)) {
552 GD2_DBG(gd_error("Using raw format data"));
553 if (im->trueColor) {
554 dpos = (cy * (cs * fsx) * 4 + cx * cs * (yhi - ylo) * 4) + dstart;
555 } else {
556 dpos = cy * (cs * fsx) + cx * cs * (yhi - ylo) + dstart;
557 }
558
559 /* gd 2.0.11: gdSeek returns TRUE on success, not 0. Longstanding bug. 01/16/03 */
560 if (!gdSeek(in, dpos)) {
561 gd_error_ex(E_WARNING, "Error from seek: %d", errno);
562 goto fail2;
563 }
564 GD2_DBG(gd_error("Reading (%d, %d) from position %d", cx, cy, dpos - dstart));
565 } else {
566 chunkNum = cx + cy * ncx;
567
568 chunkLen = chunkMax;
569 if (!_gd2ReadChunk (chunkIdx[chunkNum].offset, compBuf, chunkIdx[chunkNum].size, (char *)chunkBuf, &chunkLen, in)) {
570 gd_error("Error reading comproessed chunk");
571 goto fail2;
572 }
573 chunkPos = 0;
574 GD2_DBG(gd_error("Reading (%d, %d) from chunk %d", cx, cy, chunkNum));
575 }
576
577 GD2_DBG(gd_error(" into (%d, %d) - (%d, %d)", xlo, ylo, xhi, yhi));
578
579 for (y = ylo; (y < yhi); y++) {
580 for (x = xlo; x < xhi; x++) {
581 if (!gd2_compressed(fmt)) {
582 if (im->trueColor) {
583 if (!gdGetInt((int *)&ch, in)) {
584 ch = 0;
585 }
586 } else {
587 ch = gdGetC(in);
588 if ((int)ch == EOF) {
589 ch = 0;
590 }
591 }
592 } else {
593 if (im->trueColor) {
594 ch = chunkBuf[chunkPos++];
595 ch = (ch << 8) + chunkBuf[chunkPos++];
596 ch = (ch << 8) + chunkBuf[chunkPos++];
597 ch = (ch << 8) + chunkBuf[chunkPos++];
598 } else {
599 ch = chunkBuf[chunkPos++];
600 }
601 }
602
603 /* Only use a point that is in the image. */
604 if ((x >= srcx) && (x < (srcx + w)) && (x < fsx) && (x >= 0) && (y >= srcy) && (y < (srcy + h)) && (y < fsy) && (y >= 0)) {
605 if (im->trueColor) {
606 im->tpixels[y - srcy][x - srcx] = ch;
607 } else {
608 im->pixels[y - srcy][x - srcx] = ch;
609 }
610 }
611 }
612 }
613 }
614 }
615
616 if (chunkBuf) {
617 gdFree(chunkBuf);
618 }
619 if (compBuf) {
620 gdFree(compBuf);
621 }
622 if (chunkIdx) {
623 gdFree(chunkIdx);
624 }
625
626 return im;
627
628 fail2:
629 gdImageDestroy(im);
630 fail1:
631 if (chunkBuf) {
632 gdFree(chunkBuf);
633 }
634 if (compBuf) {
635 gdFree(compBuf);
636 }
637 if (chunkIdx) {
638 gdFree(chunkIdx);
639 }
640
641 return 0;
642 }
643
_gd2PutHeader(gdImagePtr im,gdIOCtx * out,int cs,int fmt,int cx,int cy)644 static void _gd2PutHeader (gdImagePtr im, gdIOCtx * out, int cs, int fmt, int cx, int cy)
645 {
646 int i;
647
648 /* Send the gd2 id, to verify file format. */
649 for (i = 0; i < 4; i++) {
650 gdPutC((unsigned char) (GD2_ID[i]), out);
651 }
652
653 /* We put the version info first, so future versions can easily change header info. */
654
655 gdPutWord(GD2_VERS, out);
656 gdPutWord(im->sx, out);
657 gdPutWord(im->sy, out);
658 gdPutWord(cs, out);
659 gdPutWord(fmt, out);
660 gdPutWord(cx, out);
661 gdPutWord(cy, out);
662 }
663
_gdImageGd2(gdImagePtr im,gdIOCtx * out,int cs,int fmt)664 static void _gdImageGd2 (gdImagePtr im, gdIOCtx * out, int cs, int fmt)
665 {
666 int ncx, ncy, cx, cy;
667 int x, y, ylo, yhi, xlo, xhi;
668 int chunkLen;
669 int chunkNum = 0;
670 char *chunkData = NULL; /* So we can gdFree it with impunity. */
671 char *compData = NULL; /* So we can gdFree it with impunity. */
672 uLongf compLen;
673 int idxPos = 0;
674 int idxSize;
675 t_chunk_info *chunkIdx = NULL; /* So we can gdFree it with impunity. */
676 int posSave;
677 int bytesPerPixel = im->trueColor ? 4 : 1;
678 int compMax = 0;
679
680 /* Force fmt to a valid value since we don't return anything. */
681 if ((fmt != GD2_FMT_RAW) && (fmt != GD2_FMT_COMPRESSED)) {
682 fmt = GD2_FMT_COMPRESSED;
683 }
684 if (im->trueColor) {
685 fmt += 2;
686 }
687 /* Make sure chunk size is valid. These are arbitrary values; 64 because it seems
688 * a little silly to expect performance improvements on a 64x64 bit scale, and
689 * 4096 because we buffer one chunk, and a 16MB buffer seems a little large - it may be
690 * OK for one user, but for another to read it, they require the buffer.
691 */
692 if (cs == 0) {
693 cs = GD2_CHUNKSIZE;
694 } else if (cs < GD2_CHUNKSIZE_MIN) {
695 cs = GD2_CHUNKSIZE_MIN;
696 } else if (cs > GD2_CHUNKSIZE_MAX) {
697 cs = GD2_CHUNKSIZE_MAX;
698 }
699
700 /* Work out number of chunks. */
701 ncx = (im->sx + cs - 1) / cs;
702 ncy = (im->sy + cs - 1) / cs;
703
704 /* Write the standard header. */
705 _gd2PutHeader (im, out, cs, fmt, ncx, ncy);
706
707 if (gd2_compressed(fmt)) {
708 /* Work out size of buffer for compressed data, If CHUNKSIZE is large,
709 * then these will be large!
710 */
711
712 /* The zlib notes say output buffer size should be (input size) * 1.01 * 12
713 * - we'll use 1.02 to be paranoid.
714 */
715 compMax = (int)(cs * bytesPerPixel * cs * 1.02f) + 12;
716
717 /* Allocate the buffers. */
718 chunkData = safe_emalloc(cs * bytesPerPixel, cs, 0);
719 memset(chunkData, 0, cs * bytesPerPixel * cs);
720 if (compMax <= 0) {
721 goto fail;
722 }
723 compData = gdCalloc(compMax, 1);
724
725 /* Save the file position of chunk index, and allocate enough space for
726 * each chunk_info block .
727 */
728 idxPos = gdTell(out);
729 idxSize = ncx * ncy * sizeof(t_chunk_info);
730 GD2_DBG(gd_error("Index size is %d", idxSize));
731 gdSeek(out, idxPos + idxSize);
732
733 chunkIdx = safe_emalloc(idxSize, sizeof(t_chunk_info), 0);
734 memset(chunkIdx, 0, idxSize * sizeof(t_chunk_info));
735 }
736
737 _gdPutColors (im, out);
738
739 GD2_DBG(gd_error("Size: %dx%d", im->sx, im->sy));
740 GD2_DBG(gd_error("Chunks: %dx%d", ncx, ncy));
741
742 for (cy = 0; (cy < ncy); cy++) {
743 for (cx = 0; (cx < ncx); cx++) {
744 ylo = cy * cs;
745 yhi = ylo + cs;
746 if (yhi > im->sy) {
747 yhi = im->sy;
748 }
749
750 GD2_DBG(gd_error("Processing Chunk (%dx%d), y from %d to %d", cx, cy, ylo, yhi));
751 chunkLen = 0;
752 for (y = ylo; (y < yhi); y++) {
753 GD2_DBG(gd_error("y=%d: ",y));
754 xlo = cx * cs;
755 xhi = xlo + cs;
756 if (xhi > im->sx) {
757 xhi = im->sx;
758 }
759
760 if (gd2_compressed(fmt)) {
761 for (x = xlo; x < xhi; x++) {
762 GD2_DBG(gd_error("%d...",x));
763 if (im->trueColor) {
764 int p = im->tpixels[y][x];
765 chunkData[chunkLen++] = gdTrueColorGetAlpha(p);
766 chunkData[chunkLen++] = gdTrueColorGetRed(p);
767 chunkData[chunkLen++] = gdTrueColorGetGreen(p);
768 chunkData[chunkLen++] = gdTrueColorGetBlue(p);
769 } else {
770 chunkData[chunkLen++] = im->pixels[y][x];
771 }
772 }
773 } else {
774 for (x = xlo; x < xhi; x++) {
775 GD2_DBG(gd_error("%d, ",x));
776
777 if (im->trueColor) {
778 gdPutInt(im->tpixels[y][x], out);
779 } else {
780 gdPutC((unsigned char) im->pixels[y][x], out);
781 }
782 }
783 }
784 GD2_DBG(gd_error("y=%d done.",y));
785 }
786
787 if (gd2_compressed(fmt)) {
788 compLen = compMax;
789 if (compress((unsigned char *) &compData[0], &compLen, (unsigned char *) &chunkData[0], chunkLen) != Z_OK) {
790 gd_error("Error from compressing");
791 } else {
792 chunkIdx[chunkNum].offset = gdTell(out);
793 chunkIdx[chunkNum++].size = compLen;
794 GD2_DBG(gd_error("Chunk %d size %d offset %d", chunkNum, chunkIdx[chunkNum - 1].size, chunkIdx[chunkNum - 1].offset));
795
796 if (gdPutBuf (compData, compLen, out) <= 0) {
797 /* Any alternate suggestions for handling this? */
798 gd_error_ex(E_WARNING, "Error %d on write", errno);
799 }
800 }
801 }
802 }
803 }
804
805 if (gd2_compressed(fmt)) {
806 /* Save the position, write the index, restore position (paranoia). */
807 GD2_DBG(gd_error("Seeking %d to write index", idxPos));
808 posSave = gdTell(out);
809 gdSeek(out, idxPos);
810 GD2_DBG(gd_error("Writing index"));
811 for (x = 0; x < chunkNum; x++) {
812 GD2_DBG(gd_error("Chunk %d size %d offset %d", x, chunkIdx[x].size, chunkIdx[x].offset));
813 gdPutInt(chunkIdx[x].offset, out);
814 gdPutInt(chunkIdx[x].size, out);
815 }
816 gdSeek(out, posSave);
817 }
818 fail:
819 GD2_DBG(gd_error("Freeing memory"));
820 if (chunkData) {
821 gdFree(chunkData);
822 }
823 if (compData) {
824 gdFree(compData);
825 }
826 if (chunkIdx) {
827 gdFree(chunkIdx);
828 }
829 GD2_DBG(gd_error("Done"));
830 }
831
gdImageGd2(gdImagePtr im,FILE * outFile,int cs,int fmt)832 void gdImageGd2 (gdImagePtr im, FILE * outFile, int cs, int fmt)
833 {
834 gdIOCtx *out = gdNewFileCtx(outFile);
835
836 _gdImageGd2(im, out, cs, fmt);
837
838 out->gd_free(out);
839 }
840
gdImageGd2Ptr(gdImagePtr im,int cs,int fmt,int * size)841 void *gdImageGd2Ptr (gdImagePtr im, int cs, int fmt, int *size)
842 {
843 void *rv;
844 gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
845
846 _gdImageGd2(im, out, cs, fmt);
847 rv = gdDPExtractData(out, size);
848 out->gd_free(out);
849
850 return rv;
851 }
852
