10 |
|
#include <string.h> |
11 |
|
#include "bmpfile.h" |
12 |
|
|
13 |
< |
/* get corresponding error message */ |
13 |
> |
#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
14 |
> |
#undef getc |
15 |
> |
#undef putc |
16 |
> |
#define getc getc_unlocked |
17 |
> |
#define putc putc_unlocked |
18 |
> |
#endif |
19 |
> |
|
20 |
> |
/* Get corresponding error message */ |
21 |
|
const char * |
22 |
|
BMPerrorMessage(int ec) |
23 |
|
{ |
38 |
|
return "Unknown BMP error"; |
39 |
|
} |
40 |
|
|
41 |
< |
/* check than header is sensible */ |
41 |
> |
/* Check that header is sensible */ |
42 |
|
static int |
43 |
|
BMPheaderOK(const BMPHeader *hdr) |
44 |
|
{ |
71 |
|
if (hdr->compr == BI_BITFIELDS && (BMPbitField(hdr)[0] & |
72 |
|
BMPbitField(hdr)[1] & BMPbitField(hdr)[2])) |
73 |
|
return 0; |
74 |
< |
if ((hdr->nColors < 0) | (hdr->impColors < 0)) |
75 |
< |
return 0; |
76 |
< |
if (hdr->impColors > hdr->nColors) |
77 |
< |
return 0; |
78 |
< |
if (hdr->nColors > BMPpalLen(hdr)) |
79 |
< |
return 0; |
74 |
> |
if (hdr->bpp > 8) { |
75 |
> |
if (hdr->nColors != 0) |
76 |
> |
return 0; |
77 |
> |
} else { |
78 |
> |
if ((hdr->nColors < 0) | (hdr->nColors > 1<<hdr->bpp)) |
79 |
> |
return 0; |
80 |
> |
if ((hdr->impColors < 0) | (hdr->impColors > hdr->nColors)) |
81 |
> |
return 0; |
82 |
> |
} |
83 |
|
return 1; |
84 |
|
} |
85 |
|
|
89 |
|
/* get next byte from reader */ |
90 |
|
#define rdbyte(c,br) ((br)->fpos += (c=(*(br)->cget)((br)->c_data))!=EOF, c) |
91 |
|
|
92 |
< |
/* read n bytes */ |
92 |
> |
/* Read n bytes */ |
93 |
|
static int |
94 |
|
rdbytes(char *bp, uint32 n, BMPReader *br) |
95 |
|
{ |
103 |
|
return BIR_OK; |
104 |
|
} |
105 |
|
|
106 |
< |
/* read 32-bit integer in littlendian order */ |
106 |
> |
/* Read 32-bit integer in littlendian order */ |
107 |
|
static int32 |
108 |
|
rdint32(BMPReader *br) |
109 |
|
{ |
117 |
|
return i; /* -1 on EOF */ |
118 |
|
} |
119 |
|
|
120 |
< |
/* read 16-bit unsigned integer in littlendian order */ |
120 |
> |
/* Read 16-bit unsigned integer in littlendian order */ |
121 |
|
static int |
122 |
|
rduint16(BMPReader *br) |
123 |
|
{ |
129 |
|
return i; /* -1 on EOF */ |
130 |
|
} |
131 |
|
|
132 |
< |
/* seek on reader or return 0 (BIR_OK) on success */ |
132 |
> |
/* Seek on reader or return 0 (BIR_OK) on success */ |
133 |
|
static int |
134 |
|
rdseek(uint32 pos, BMPReader *br) |
135 |
|
{ |
141 |
|
return BIR_OK; |
142 |
|
} |
143 |
|
|
144 |
< |
/* open BMP stream for reading and get first scanline */ |
144 |
> |
/* Open BMP stream for reading and get first scanline */ |
145 |
|
BMPReader * |
146 |
|
BMPopenReader(int (*cget)(void *), int (*seek)(uint32, void *), void *c_data) |
147 |
|
{ |
148 |
|
BMPReader *br; |
149 |
< |
uint32 bmPos, hdrSiz; |
150 |
< |
int palLen; |
149 |
> |
uint32 bmPos, hdrSiz, palSiz; |
150 |
> |
int magic[2]; /* check magic number */ |
151 |
|
|
152 |
|
if (cget == NULL) |
153 |
|
return NULL; |
154 |
< |
int magic[2]; /* check magic number */ |
154 |
> |
if (cget == &stdio_getc && c_data == NULL) |
155 |
> |
return NULL; /* stdio error condition */ |
156 |
|
magic[0] = (*cget)(c_data); |
157 |
|
if (magic[0] != 'B') |
158 |
|
return NULL; |
190 |
|
br->hdr->hRes = rdint32(br); /* horizontal resolution */ |
191 |
|
br->hdr->vRes = rdint32(br); /* vertical resolution */ |
192 |
|
br->hdr->nColors = rdint32(br); /* # colors used */ |
193 |
+ |
if (!br->hdr->nColors && br->hdr->bpp <= 8) |
194 |
+ |
br->hdr->nColors = 1<<br->hdr->bpp; |
195 |
|
br->hdr->impColors = rdint32(br); /* # important colors */ |
196 |
|
if (br->hdr->impColors < 0) |
197 |
|
goto err; /* catch premature EOF */ |
198 |
|
if (!BMPheaderOK(br->hdr)) |
199 |
|
goto err; |
200 |
< |
palLen = BMPpalLen(br->hdr); |
201 |
< |
if (br->hdr->bpp <= 8) { /* normalize color counts */ |
202 |
< |
if (br->hdr->nColors <= 0) |
190 |
< |
br->hdr->nColors = palLen; |
191 |
< |
if (br->hdr->impColors <= 0) |
192 |
< |
br->hdr->impColors = br->hdr->nColors; |
193 |
< |
} |
200 |
> |
palSiz = sizeof(RGBquad)*br->hdr->nColors; |
201 |
> |
if (br->hdr->impColors <= 0) |
202 |
> |
br->hdr->impColors = br->hdr->nColors; |
203 |
|
/* extend header */ |
204 |
< |
if (bmPos < hdrSiz + sizeof(RGBquad)*palLen) |
204 |
> |
if (bmPos < hdrSiz + palSiz) |
205 |
|
goto err; |
206 |
< |
br->hdr->infoSiz = bmPos - (hdrSiz + sizeof(RGBquad)*palLen); |
207 |
< |
if (palLen > 0 || br->hdr->infoSiz > 0) { |
206 |
> |
br->hdr->infoSiz = bmPos - (hdrSiz + palSiz); |
207 |
> |
if (br->hdr->nColors > 0 || br->hdr->infoSiz > 0) { |
208 |
|
br->hdr = (BMPHeader *)realloc((void *)br->hdr, |
209 |
|
sizeof(BMPHeader) + |
210 |
< |
sizeof(RGBquad)*palLen + |
202 |
< |
br->hdr->infoSiz); |
210 |
> |
palSiz + br->hdr->infoSiz); |
211 |
|
if (br->hdr == NULL) |
212 |
|
goto err; |
213 |
|
} |
216 |
|
BMPbitField(br->hdr)[0] = (uint32)rdint32(br); |
217 |
|
BMPbitField(br->hdr)[1] = (uint32)rdint32(br); |
218 |
|
BMPbitField(br->hdr)[2] = (uint32)rdint32(br); |
219 |
< |
} else if (rdbytes((char *)br->hdr->palette, |
212 |
< |
sizeof(RGBquad)*palLen, br) != BIR_OK) |
219 |
> |
} else if (rdbytes((char *)br->hdr->palette, palSiz, br) != BIR_OK) |
220 |
|
goto err; |
221 |
|
/* read add'l information */ |
222 |
|
if (rdbytes(BMPinfo(br->hdr), br->hdr->infoSiz, br) != BIR_OK) |
239 |
|
sizeof(br->scanpos[0])*br->hdr->height); |
240 |
|
} |
241 |
|
br->scanpos[0] = br->fpos; |
242 |
< |
if (BMPreadScanline(br) != BIR_OK) |
243 |
< |
goto err; |
237 |
< |
return br; |
242 |
> |
if (BMPreadScanline(br) == BIR_OK) |
243 |
> |
return br; |
244 |
|
err: |
245 |
|
if (br->hdr != NULL) |
246 |
|
free((void *)br->hdr); |
250 |
|
return NULL; |
251 |
|
} |
252 |
|
|
253 |
< |
/* determine if image is grayscale */ |
253 |
> |
/* Determine if image is grayscale */ |
254 |
|
int |
255 |
|
BMPisGrayscale(const BMPHeader *hdr) |
256 |
|
{ |
261 |
|
return -1; |
262 |
|
if (hdr->bpp > 8) /* assume they had a reason for it */ |
263 |
|
return 0; |
264 |
< |
for (rgbp = hdr->palette, n = hdr->nColors; n-- > 0; rgbp++) |
265 |
< |
if (((rgbp->r != rgbp->g) | (rgbp->g != rgbp->b))) |
264 |
> |
for (rgbp = hdr->palette, n = hdr->impColors; n-- > 0; rgbp++) |
265 |
> |
if ((rgbp->r != rgbp->g) | (rgbp->g != rgbp->b)) |
266 |
|
return 0; |
267 |
|
return 1; /* all colors neutral in map */ |
268 |
|
} |
269 |
|
|
270 |
< |
/* read and decode next BMP scanline */ |
270 |
> |
/* Read and decode next BMP scanline */ |
271 |
|
int |
272 |
|
BMPreadScanline(BMPReader *br) |
273 |
|
{ |
281 |
|
if (br->hdr->compr == BI_UNCOMPR || br->hdr->compr == BI_BITFIELDS) |
282 |
|
return rdbytes((char *)br->scanline, n, br); |
283 |
|
/* |
284 |
< |
* RLE/RLE8 Decoding |
284 |
> |
* RLE4/RLE8 Decoding |
285 |
|
* |
286 |
|
* Certain aspects of this scheme are completely insane, so |
287 |
|
* we don't support them. Fortunately, they rarely appear. |
288 |
|
* One is the mid-file EOD (0x0001) and another is the ill-conceived |
289 |
|
* "delta" (0x0002), which is like a "goto" statement for bitmaps. |
290 |
< |
* Whoever thought this up should be shot, then told why |
291 |
< |
* it's impossible to support such a scheme in any reasonable way. |
290 |
> |
* Whoever thought this up should be wrestled to the ground and told |
291 |
> |
* why it's impossible to support such a scheme in any reasonable way. |
292 |
|
* Also, RLE4 mode allows runs to stop halfway through a byte, |
293 |
|
* which is likewise uncodeable, so we don't even try. |
294 |
|
* Finally, the scanline break is ambiguous -- we assume here that |
302 |
|
* is it specified what we should assume for missing pixels. This |
303 |
|
* is undoubtedly the most brain-dead format I've ever encountered. |
304 |
|
*/ |
305 |
< |
sp = br->scanline; |
305 |
> |
sp = (int8 *)br->scanline; |
306 |
> |
n = br->hdr->width; |
307 |
> |
if (br->hdr->compr == BI_RLE4) |
308 |
> |
n = (n + 1) >> 1; |
309 |
|
while (n > 0) { |
310 |
|
int skipOdd, len, val; |
311 |
|
|
326 |
|
*sp++ = val; |
327 |
|
continue; |
328 |
|
} |
329 |
+ |
/* check for escape */ |
330 |
|
switch (rdbyte(len, br)) { |
331 |
|
case EOF: |
332 |
|
return BIR_TRUNCATED; |
366 |
|
return BIR_OK; |
367 |
|
} |
368 |
|
|
369 |
< |
/* read a specific scanline */ |
369 |
> |
/* Read a specific scanline */ |
370 |
|
int |
371 |
|
BMPseekScanline(int y, BMPReader *br) |
372 |
|
{ |
409 |
|
return BIR_OK; |
410 |
|
} |
411 |
|
|
412 |
< |
/* get ith pixel from last scanline */ |
412 |
> |
/* Get ith pixel from last scanline */ |
413 |
|
RGBquad |
414 |
|
BMPdecodePixel(int i, const BMPReader *br) |
415 |
|
{ |
455 |
|
case 8: |
456 |
|
return br->hdr->palette[br->scanline[i]]; |
457 |
|
case 1: |
458 |
< |
return br->hdr->palette[br->scanline[i>>3]>>((7-i)&7) & 1]; |
458 |
> |
return br->hdr->palette[br->scanline[i>>3]>>(7-(i&7)) & 1]; |
459 |
|
case 4: |
460 |
|
return br->hdr->palette[br->scanline[i>>1]>>(i&1?4:0) & 0xf]; |
461 |
|
case 16: |
473 |
|
return black; /* should never happen */ |
474 |
|
} |
475 |
|
|
476 |
< |
/* free BMP reader resources */ |
476 |
> |
/* Free BMP reader resources */ |
477 |
|
void |
478 |
|
BMPfreeReader(BMPReader *br) |
479 |
|
{ |
510 |
|
return fseek((FILE *)p, (long)pos, 0); |
511 |
|
} |
512 |
|
|
513 |
< |
/* allocate uncompressed (24-bit) RGB header */ |
513 |
> |
/* Allocate uncompressed (24-bit) RGB header */ |
514 |
|
BMPHeader * |
515 |
|
BMPtruecolorHeader(int xr, int yr, int infolen) |
516 |
|
{ |
533 |
|
return hdr; |
534 |
|
} |
535 |
|
|
536 |
< |
/* allocate color-mapped header (defaults to minimal grayscale) */ |
536 |
> |
/* Allocate color-mapped header (defaults to minimal grayscale) */ |
537 |
|
BMPHeader * |
538 |
|
BMPmappedHeader(int xr, int yr, int infolen, int ncolors) |
539 |
|
{ |
551 |
|
else |
552 |
|
return NULL; |
553 |
|
hdr = (BMPHeader *)malloc(sizeof(BMPHeader) + |
554 |
< |
sizeof(RGBquad)*(1<<n) - |
554 |
> |
sizeof(RGBquad)*((size_t)1<<n) - |
555 |
|
sizeof(hdr->palette) + |
556 |
|
infolen); |
557 |
|
if (hdr == NULL) |
565 |
|
hdr->nColors = ncolors; |
566 |
|
hdr->impColors = 0; /* says all colors important */ |
567 |
|
hdr->infoSiz = infolen; |
568 |
< |
memset((void *)hdr->palette, 0, sizeof(RGBquad)*(1<<n) + infolen); |
568 |
> |
memset((void *)hdr->palette, 0, sizeof(RGBquad)*((size_t)1<<n) + infolen); |
569 |
|
for (n = ncolors; n--; ) |
570 |
|
hdr->palette[n].r = hdr->palette[n].g = |
571 |
|
hdr->palette[n].b = n*255/(ncolors-1); |
578 |
|
((bw)->flen = (bw)->fpos) : \ |
579 |
|
(bw)->fpos ) |
580 |
|
|
581 |
< |
/* write out a string of bytes */ |
581 |
> |
/* Write out a string of bytes */ |
582 |
|
static void |
583 |
|
wrbytes(char *bp, uint32 n, BMPWriter *bw) |
584 |
|
{ |
586 |
|
wrbyte(*bp++, bw); |
587 |
|
} |
588 |
|
|
589 |
< |
/* write 32-bit integer in littlendian order */ |
589 |
> |
/* Write 32-bit integer in littlendian order */ |
590 |
|
static void |
591 |
|
wrint32(int32 i, BMPWriter *bw) |
592 |
|
{ |
596 |
|
wrbyte(i>>24 & 0xff, bw); |
597 |
|
} |
598 |
|
|
599 |
< |
/* write 16-bit unsigned integer in littlendian order */ |
599 |
> |
/* Write 16-bit unsigned integer in littlendian order */ |
600 |
|
static void |
601 |
|
wruint16(uint16 ui, BMPWriter *bw) |
602 |
|
{ |
604 |
|
wrbyte(ui>>8 & 0xff, bw); |
605 |
|
} |
606 |
|
|
607 |
< |
/* seek to the specified file position, returning 0 (BIR_OK) on success */ |
607 |
> |
/* Seek to the specified file position, returning 0 (BIR_OK) on success */ |
608 |
|
static int |
609 |
|
wrseek(uint32 pos, BMPWriter *bw) |
610 |
|
{ |
611 |
|
if (pos == bw->fpos) |
612 |
|
return BIR_OK; |
613 |
< |
if (bw->seek == NULL) { |
614 |
< |
if (pos < bw->fpos) |
605 |
< |
return BIR_SEEKERR; |
606 |
< |
while (bw->fpos < pos) |
607 |
< |
wrbyte(0, bw); |
608 |
< |
return BIR_OK; |
609 |
< |
} |
613 |
> |
if (bw->seek == NULL) |
614 |
> |
return BIR_SEEKERR; |
615 |
|
if ((*bw->seek)(pos, bw->c_data) != 0) |
616 |
|
return BIR_SEEKERR; |
617 |
|
bw->fpos = pos; |
620 |
|
return BIR_OK; |
621 |
|
} |
622 |
|
|
623 |
< |
/* open BMP stream for writing */ |
623 |
> |
/* Open BMP stream for writing */ |
624 |
|
BMPWriter * |
625 |
|
BMPopenWriter(void (*cput)(int, void *), int (*seek)(uint32, void *), |
626 |
|
void *c_data, BMPHeader *hdr) |
630 |
|
/* check arguments */ |
631 |
|
if (cput == NULL) |
632 |
|
return NULL; |
633 |
+ |
if (cput == &stdio_putc && c_data == NULL) |
634 |
+ |
return NULL; /* stdio error condition */ |
635 |
|
if (!BMPheaderOK(hdr)) |
636 |
|
return NULL; |
637 |
|
if ((hdr->bpp == 16) | (hdr->compr == BI_RLE4)) |
644 |
|
hdrSiz = 2 + 6*4 + 2*2 + 6*4; |
645 |
|
if (hdr->compr == BI_BITFIELDS) |
646 |
|
hdrSiz += sizeof(uint32)*3; |
647 |
< |
palSiz = sizeof(RGBquad)*BMPpalLen(hdr); |
647 |
> |
palSiz = sizeof(RGBquad)*hdr->nColors; |
648 |
|
scanSiz = getScanSiz(hdr); |
649 |
|
bmSiz = hdr->height*scanSiz; /* wrong if compressed */ |
650 |
|
/* initialize writer */ |
695 |
|
return bw; |
696 |
|
} |
697 |
|
|
698 |
< |
/* find position of next run of 5 or more identical bytes, or 255 if none */ |
698 |
> |
/* Find position of next run of 5 or more identical bytes, or 255 if none */ |
699 |
|
static int |
700 |
|
findNextRun(const int8 *bp, int len) |
701 |
|
{ |
712 |
|
return pos; /* didn't find any */ |
713 |
|
} |
714 |
|
|
715 |
< |
/* write the current scanline */ |
715 |
> |
/* Write the current scanline */ |
716 |
|
int |
717 |
|
BMPwriteScanline(BMPWriter *bw) |
718 |
|
{ |
740 |
|
* (0x0000) except for the last, which ends in a bitmap break |
741 |
|
* (0x0001). We don't support RLE4 at all; it's too awkward. |
742 |
|
*/ |
743 |
< |
sp = bw->scanline; |
743 |
> |
sp = (const int8 *)bw->scanline; |
744 |
|
n = bw->hdr->width; |
745 |
|
while (n > 0) { |
746 |
|
int cnt, val; |
740 |
– |
|
747 |
|
cnt = findNextRun(sp, n); /* 0-255 < n */ |
748 |
< |
if (cnt >= 3) { /* output non-run */ |
748 |
> |
if (cnt >= 3) { /* output absolute */ |
749 |
|
int skipOdd = cnt & 1; |
750 |
|
wrbyte(0, bw); |
751 |
|
wrbyte(cnt, bw); |
757 |
|
} |
758 |
|
if (n <= 0) /* was that it? */ |
759 |
|
break; |
760 |
< |
val = *sp; /* output run */ |
761 |
< |
for (cnt = 1; cnt < 255; cnt++) |
762 |
< |
if (!--n | *++sp != val) |
760 |
> |
val = *sp++; /* output run */ |
761 |
> |
for (cnt = 1; --n && cnt < 255; cnt++, sp++) |
762 |
> |
if (*sp != val) |
763 |
|
break; |
764 |
|
wrbyte(cnt, bw); |
765 |
|
wrbyte(val, bw); |
767 |
|
bw->yscan++; /* write line break or EOD */ |
768 |
|
if (bw->yscan == bw->hdr->height) { |
769 |
|
wrbyte(0, bw); wrbyte(1, bw); /* end of bitmap marker */ |
770 |
< |
if (bw->seek == NULL || (*bw->seek)(2, bw->c_data) != 0) |
770 |
> |
if (wrseek(2, bw) != BIR_OK) |
771 |
|
return BIR_OK; /* no one may care */ |
772 |
< |
bw->fpos = 2; |
772 |
> |
wrint32(bw->flen, bw); /* correct file length */ |
773 |
> |
if (wrseek(34, bw) != BIR_OK) |
774 |
> |
return BIR_OK; |
775 |
|
wrint32(bw->flen-bw->fbmp, bw); /* correct bitmap length */ |
776 |
|
} else { |
777 |
|
wrbyte(0, bw); wrbyte(0, bw); /* end of line marker */ |
779 |
|
return BIR_OK; |
780 |
|
} |
781 |
|
|
782 |
< |
/* free BMP writer resources */ |
782 |
> |
/* Free BMP writer resources */ |
783 |
|
void |
784 |
|
BMPfreeWriter(BMPWriter *bw) |
785 |
|
{ |