43341922 |
1 | /* |
2 | * PDF backend for Halibut |
3 | */ |
4 | |
5 | #include <assert.h> |
6 | #include "halibut.h" |
7 | #include "paper.h" |
7e2417cc |
8 | #include "deflate.h" |
43341922 |
9 | |
7157d7e1 |
10 | #define TREE_BRANCH 8 /* max branching factor in page tree */ |
43341922 |
11 | |
12 | paragraph *pdf_config_filename(char *filename) |
13 | { |
e4ea58f8 |
14 | return cmdline_cfg_simple("pdf-filename", filename, NULL); |
43341922 |
15 | } |
16 | |
17 | typedef struct object_Tag object; |
18 | typedef struct objlist_Tag objlist; |
19 | |
20 | struct object_Tag { |
21 | objlist *list; |
22 | object *next; |
23 | int number; |
24 | rdstringc main, stream; |
25 | int size, fileoff; |
26 | char *final; |
27 | }; |
28 | |
29 | struct objlist_Tag { |
30 | int number; |
31 | object *head, *tail; |
32 | }; |
33 | |
34 | static object *new_object(objlist *list); |
35 | static void objtext(object *o, char const *text); |
36 | static void objstream(object *o, char const *text); |
7c8c4239 |
37 | static void pdf_string(void (*add)(object *, char const *), |
38 | object *, char const *); |
ce1b04aa |
39 | static void pdf_string_len(void (*add)(object *, char const *), |
40 | object *, char const *, int); |
43341922 |
41 | static void objref(object *o, object *dest); |
3e7284e8 |
42 | static void objdest(object *o, page_data *p); |
993ade7a |
43 | static char *pdf_outline_convert(wchar_t *s, int *len); |
43341922 |
44 | |
3600720b |
45 | static int is_std_font(char const *name); |
46 | |
43341922 |
47 | static void make_pages_node(object *node, object *parent, page_data *first, |
2ff8419e |
48 | page_data *last, object *resources, |
49 | object *mediabox); |
f0e51ce1 |
50 | static int make_outline(object *parent, outline_element *start, int n, |
51 | int open); |
09358aa7 |
52 | static int pdf_versionid(FILE *fp, word *words); |
43341922 |
53 | |
54 | void pdf_backend(paragraph *sourceform, keywordlist *keywords, |
55 | indexdata *idx, void *vdoc) { |
56 | document *doc = (document *)vdoc; |
57 | int font_index; |
58 | font_encoding *fe; |
59 | page_data *page; |
60 | int pageno; |
61 | FILE *fp; |
62 | char *filename; |
63 | paragraph *p; |
64 | objlist olist; |
993ade7a |
65 | object *o, *info, *cat, *outlines, *pages, *resources, *mediabox; |
43341922 |
66 | int fileoff; |
67 | |
68 | IGNORE(keywords); |
69 | IGNORE(idx); |
70 | |
71 | filename = dupstr("output.pdf"); |
72 | for (p = sourceform; p; p = p->next) { |
7738a2fb |
73 | if (p->type == para_Config) { |
43341922 |
74 | if (!ustricmp(p->keyword, L"pdf-filename")) { |
75 | sfree(filename); |
e4ea58f8 |
76 | filename = dupstr(adv(p->origkeyword)); |
43341922 |
77 | } |
78 | } |
79 | } |
80 | |
81 | olist.head = olist.tail = NULL; |
82 | olist.number = 1; |
83 | |
993ade7a |
84 | { |
85 | char buf[256]; |
86 | |
87 | info = new_object(&olist); |
88 | objtext(info, "<<\n"); |
89 | if (doc->n_outline_elements > 0) { |
90 | char *title; |
91 | int titlelen; |
92 | |
93 | title = |
94 | pdf_outline_convert(doc->outline_elements->pdata->outline_title, |
95 | &titlelen); |
96 | objtext(info, "/Title "); |
97 | pdf_string_len(objtext, info, title, titlelen); |
98 | sfree(title); |
99 | objtext(info, "\n"); |
100 | } |
101 | objtext(info, "/Producer "); |
102 | sprintf(buf, "Halibut, %s", version); |
103 | pdf_string(objtext, info, buf); |
104 | objtext(info, "\n>>\n"); |
105 | } |
106 | |
43341922 |
107 | cat = new_object(&olist); |
a615a778 |
108 | if (doc->n_outline_elements > 0) |
109 | outlines = new_object(&olist); |
110 | else |
111 | outlines = NULL; |
43341922 |
112 | pages = new_object(&olist); |
113 | resources = new_object(&olist); |
114 | |
115 | /* |
43341922 |
116 | * The catalogue just contains references to the outlines and |
b7d31949 |
117 | * pages objects, and the pagelabels dictionary. |
43341922 |
118 | */ |
a615a778 |
119 | objtext(cat, "<<\n/Type /Catalog"); |
120 | if (outlines) { |
121 | objtext(cat, "\n/Outlines "); |
122 | objref(cat, outlines); |
123 | } |
43341922 |
124 | objtext(cat, "\n/Pages "); |
125 | objref(cat, pages); |
b7d31949 |
126 | /* Halibut just numbers pages 1, 2, 3, ... */ |
127 | objtext(cat, "\n/PageLabels<</Nums[0<</S/D>>]>>"); |
a615a778 |
128 | if (outlines) |
129 | objtext(cat, "\n/PageMode /UseOutlines"); |
130 | objtext(cat, "\n>>\n"); |
43341922 |
131 | |
132 | /* |
133 | * Set up the resources dictionary, which mostly means |
134 | * providing all the font objects and names to call them by. |
135 | */ |
136 | font_index = 0; |
c2b15a94 |
137 | objtext(resources, "<<\n/ProcSet [/PDF/Text]\n/Font <<\n"); |
43341922 |
138 | for (fe = doc->fonts->head; fe; fe = fe->next) { |
139 | char fname[40]; |
b17a4ef3 |
140 | int i, prev; |
43341922 |
141 | object *font; |
142 | |
143 | sprintf(fname, "f%d", font_index++); |
144 | fe->name = dupstr(fname); |
145 | |
146 | font = new_object(&olist); |
147 | |
148 | objtext(resources, "/"); |
149 | objtext(resources, fe->name); |
150 | objtext(resources, " "); |
151 | objref(resources, font); |
152 | objtext(resources, "\n"); |
153 | |
154 | objtext(font, "<<\n/Type /Font\n/Subtype /Type1\n/Name /"); |
155 | objtext(font, fe->name); |
156 | objtext(font, "\n/BaseFont /"); |
ba0fe3ec |
157 | objtext(font, fe->font->info->name); |
43341922 |
158 | objtext(font, "\n/Encoding <<\n/Type /Encoding\n/Differences ["); |
159 | |
160 | for (i = 0; i < 256; i++) { |
161 | char buf[20]; |
162 | if (!fe->vector[i]) |
163 | continue; |
b17a4ef3 |
164 | if (i != prev + 1) { |
165 | sprintf(buf, "\n%d", i); |
166 | objtext(font, buf); |
167 | } |
168 | objtext(font, i % 8 ? "/" : "\n/"); |
169 | objtext(font, fe->vector[i]); |
170 | prev = i; |
43341922 |
171 | } |
172 | |
173 | objtext(font, "\n]\n>>\n"); |
174 | |
255b7ff3 |
175 | #define FF_FIXEDPITCH 0x00000001 |
176 | #define FF_SERIF 0x00000002 |
177 | #define FF_SYMBOLIC 0x00000004 |
178 | #define FF_SCRIPT 0x00000008 |
179 | #define FF_NONSYMBOLIC 0x00000020 |
180 | #define FF_ITALIC 0x00000040 |
181 | #define FF_ALLCAP 0x00010000 |
182 | #define FF_SMALLCAP 0x00020000 |
183 | #define FF_FORCEBOLD 0x00040000 |
184 | |
3600720b |
185 | if (!is_std_font(fe->font->info->name)){ |
43341922 |
186 | object *widths = new_object(&olist); |
255b7ff3 |
187 | object *fontdesc = new_object(&olist); |
9fb062fc |
188 | int firstchar = -1, lastchar = -1; |
189 | char buf[80]; |
255b7ff3 |
190 | font_info const *fi = fe->font->info; |
191 | int flags; |
9fb062fc |
192 | for (i = 0; i < 256; i++) |
193 | if (fe->indices[i] >= 0) { |
194 | if (firstchar < 0) firstchar = i; |
195 | lastchar = i; |
196 | } |
197 | sprintf(buf, "/FirstChar %d\n/LastChar %d\n/Widths ", |
198 | firstchar, lastchar); |
199 | objtext(font, buf); |
43341922 |
200 | objref(font, widths); |
201 | objtext(font, "\n"); |
202 | objtext(widths, "[\n"); |
9fb062fc |
203 | for (i = firstchar; i <= lastchar; i++) { |
43341922 |
204 | double width; |
205 | if (fe->indices[i] < 0) |
206 | width = 0.0; |
207 | else |
255b7ff3 |
208 | width = fi->widths[fe->indices[i]]; |
17c71b41 |
209 | sprintf(buf, "%g\n", 1000.0 * width / FUNITS_PER_PT); |
43341922 |
210 | objtext(widths, buf); |
211 | } |
212 | objtext(widths, "]\n"); |
255b7ff3 |
213 | objtext(font, "/FontDescriptor "); |
214 | objref(font, fontdesc); |
215 | objtext(fontdesc, "<<\n/Type /FontDescriptor\n/Name /"); |
216 | objtext(fontdesc, fi->name); |
217 | flags = 0; |
218 | if (fi->italicangle) flags |= FF_ITALIC; |
219 | flags |= FF_NONSYMBOLIC; |
220 | sprintf(buf, "\n/Flags %d\n", flags); |
221 | objtext(fontdesc, buf); |
222 | sprintf(buf, "/FontBBox [%g %g %g %g]\n", fi->fontbbox[0], |
223 | fi->fontbbox[1], fi->fontbbox[2], fi->fontbbox[3]); |
224 | objtext(fontdesc, buf); |
225 | sprintf(buf, "/ItalicAngle %g\n", fi->italicangle); |
226 | objtext(fontdesc, buf); |
227 | sprintf(buf, "/Ascent %g\n", fi->ascent); |
228 | objtext(fontdesc, buf); |
229 | sprintf(buf, "/Descent %g\n", fi->descent); |
230 | objtext(fontdesc, buf); |
231 | sprintf(buf, "/CapHeight %g\n", fi->capheight); |
232 | objtext(fontdesc, buf); |
233 | sprintf(buf, "/XHeight %g\n", fi->xheight); |
234 | objtext(fontdesc, buf); |
235 | sprintf(buf, "/StemH %g\n", fi->stemh); |
236 | objtext(fontdesc, buf); |
237 | sprintf(buf, "/StemV %g\n", fi->stemv); |
238 | objtext(fontdesc, buf); |
44407fea |
239 | if (fi->fp) { |
240 | object *fontfile = new_object(&olist); |
241 | char buf[513]; |
242 | size_t len; |
243 | rewind(fi->fp); |
244 | do { |
245 | len = fread(buf, 1, sizeof(buf)-1, fi->fp); |
246 | buf[len] = 0; |
247 | objstream(fontfile, buf); |
248 | } while (len == sizeof(buf)-1); |
249 | objtext(fontdesc, "/FontFile "); |
250 | objref(fontdesc, fontfile); |
251 | } |
252 | objtext(fontdesc, "\n>>\n"); |
43341922 |
253 | } |
254 | |
255b7ff3 |
255 | objtext(font, "\n>>\n"); |
43341922 |
256 | } |
257 | objtext(resources, ">>\n>>\n"); |
258 | |
2ff8419e |
259 | { |
260 | char buf[255]; |
261 | mediabox = new_object(&olist); |
262 | sprintf(buf, "[0 0 %g %g]\n", |
263 | doc->paper_width / FUNITS_PER_PT, |
264 | doc->paper_height / FUNITS_PER_PT); |
265 | objtext(mediabox, buf); |
266 | } |
267 | |
43341922 |
268 | /* |
269 | * Define the page objects for each page, and get each one |
270 | * ready to have a `Parent' specification added to it. |
271 | */ |
272 | for (page = doc->pages; page; page = page->next) { |
273 | object *opage; |
274 | |
275 | opage = new_object(&olist); |
276 | page->spare = opage; |
277 | objtext(opage, "<<\n/Type /Page\n"); |
278 | } |
279 | |
280 | /* |
281 | * Recursively build the page tree. |
282 | */ |
2ff8419e |
283 | make_pages_node(pages, NULL, doc->pages, NULL, resources, mediabox); |
43341922 |
284 | |
285 | /* |
286 | * Create and render the individual pages. |
287 | */ |
288 | pageno = 0; |
289 | for (page = doc->pages; page; page = page->next) { |
290 | object *opage, *cstr; |
23765aeb |
291 | rect *r; |
7c8c4239 |
292 | text_fragment *frag, *frag_end; |
43341922 |
293 | char buf[256]; |
7c8c4239 |
294 | int x, y, lx, ly; |
43341922 |
295 | |
296 | opage = (object *)page->spare; |
297 | /* |
298 | * At this point the page dictionary is already |
299 | * half-written, with /Type and /Parent already present. We |
300 | * continue from there. |
301 | */ |
302 | |
303 | /* |
304 | * The PDF spec says /Resources is required, but also says |
305 | * that it's inheritable and may be omitted if it's present |
306 | * in a Pages node. In our case it is: it's present in the |
307 | * topmost /Pages node because we carefully put it there. |
2ff8419e |
308 | * So we don't need a /Resources entry here. The same applies |
309 | * to /MediaBox. |
43341922 |
310 | */ |
43341922 |
311 | |
312 | /* |
313 | * Now we're ready to define a content stream containing |
314 | * the actual text on the page. |
315 | */ |
316 | cstr = new_object(&olist); |
317 | objtext(opage, "/Contents "); |
318 | objref(opage, cstr); |
319 | objtext(opage, "\n"); |
320 | |
23765aeb |
321 | /* |
322 | * Render any rectangles on the page. |
323 | */ |
324 | for (r = page->first_rect; r; r = r->next) { |
325 | char buf[512]; |
17c71b41 |
326 | sprintf(buf, "%g %g %g %g re f\n", |
327 | r->x / FUNITS_PER_PT, r->y / FUNITS_PER_PT, |
328 | r->w / FUNITS_PER_PT, r->h / FUNITS_PER_PT); |
23765aeb |
329 | objstream(cstr, buf); |
330 | } |
331 | |
43341922 |
332 | objstream(cstr, "BT\n"); |
43341922 |
333 | |
7c8c4239 |
334 | /* |
335 | * PDF tracks two separate current positions: the position |
336 | * given in the `line matrix' and the position given in the |
337 | * `text matrix'. We must therefore track both as well. |
338 | * They start off at -1 (unset). |
339 | */ |
340 | lx = ly = -1; |
341 | x = y = -1; |
342 | |
343 | frag = page->first_text; |
344 | while (frag) { |
345 | /* |
346 | * For compactness, I'm going to group text fragments |
347 | * into subsequences that use the same font+size. So |
348 | * first find the end of this subsequence. |
349 | */ |
350 | for (frag_end = frag; |
351 | (frag_end && |
352 | frag_end->fe == frag->fe && |
353 | frag_end->fontsize == frag->fontsize); |
354 | frag_end = frag_end->next); |
355 | |
356 | /* |
357 | * Now select the text fragment, and prepare to display |
358 | * the text. |
359 | */ |
43341922 |
360 | objstream(cstr, "/"); |
361 | objstream(cstr, frag->fe->name); |
7c8c4239 |
362 | sprintf(buf, " %d Tf ", frag->fontsize); |
43341922 |
363 | objstream(cstr, buf); |
364 | |
7c8c4239 |
365 | while (frag && frag != frag_end) { |
366 | /* |
367 | * Place the text position for the first piece of |
368 | * text. |
369 | */ |
370 | if (lx < 0) { |
371 | sprintf(buf, "1 0 0 1 %g %g Tm ", |
17c71b41 |
372 | frag->x/FUNITS_PER_PT, frag->y/FUNITS_PER_PT); |
7c8c4239 |
373 | } else { |
374 | sprintf(buf, "%g %g Td ", |
17c71b41 |
375 | (frag->x - lx)/FUNITS_PER_PT, |
376 | (frag->y - ly)/FUNITS_PER_PT); |
7c8c4239 |
377 | } |
43341922 |
378 | objstream(cstr, buf); |
7c8c4239 |
379 | lx = x = frag->x; |
380 | ly = y = frag->y; |
381 | |
382 | /* |
383 | * See if we're going to use Tj (show a single |
384 | * string) or TJ (show an array of strings with |
385 | * x-spacings between them). We determine this by |
386 | * seeing if there's more than one text fragment in |
387 | * sequence with the same y-coordinate. |
388 | */ |
389 | if (frag->next && frag->next != frag_end && |
390 | frag->next->y == y) { |
391 | /* |
392 | * The TJ strategy. |
393 | */ |
394 | objstream(cstr, "["); |
395 | while (frag && frag != frag_end && frag->y == y) { |
396 | if (frag->x != x) { |
397 | sprintf(buf, "%g", |
398 | (x - frag->x) * 1000.0 / |
17c71b41 |
399 | (FUNITS_PER_PT * frag->fontsize)); |
7c8c4239 |
400 | objstream(cstr, buf); |
401 | } |
402 | pdf_string(objstream, cstr, frag->text); |
403 | x = frag->x + frag->width; |
404 | frag = frag->next; |
405 | } |
406 | objstream(cstr, "]TJ\n"); |
407 | } else |
408 | { |
409 | /* |
410 | * The Tj strategy. |
411 | */ |
412 | pdf_string(objstream, cstr, frag->text); |
413 | objstream(cstr, "Tj\n"); |
414 | frag = frag->next; |
415 | } |
43341922 |
416 | } |
43341922 |
417 | } |
418 | objstream(cstr, "ET"); |
419 | |
138d7ffb |
420 | /* |
421 | * Also, we want an annotation dictionary containing the |
422 | * cross-references from this page. |
423 | */ |
424 | if (page->first_xref) { |
425 | xref *xr; |
426 | objtext(opage, "/Annots [\n"); |
427 | |
428 | for (xr = page->first_xref; xr; xr = xr->next) { |
138d7ffb |
429 | char buf[256]; |
430 | |
6e4d0fd8 |
431 | objtext(opage, "<</Subtype/Link\n/Rect["); |
138d7ffb |
432 | sprintf(buf, "%g %g %g %g", |
17c71b41 |
433 | xr->lx / FUNITS_PER_PT, xr->by / FUNITS_PER_PT, |
434 | xr->rx / FUNITS_PER_PT, xr->ty / FUNITS_PER_PT); |
6e4d0fd8 |
435 | objtext(opage, buf); |
436 | objtext(opage, "]/Border[0 0 0]\n"); |
138d7ffb |
437 | |
438 | if (xr->dest.type == PAGE) { |
3e7284e8 |
439 | objtext(opage, "/Dest"); |
440 | objdest(opage, xr->dest.page); |
138d7ffb |
441 | } else { |
6e4d0fd8 |
442 | objtext(opage, "/A<</S/URI/URI"); |
443 | pdf_string(objtext, opage, xr->dest.url); |
444 | objtext(opage, ">>"); |
138d7ffb |
445 | } |
446 | |
6e4d0fd8 |
447 | objtext(opage, ">>\n"); |
138d7ffb |
448 | } |
449 | |
450 | objtext(opage, "]\n"); |
451 | } |
452 | |
43341922 |
453 | objtext(opage, ">>\n"); |
454 | } |
455 | |
456 | /* |
f0e51ce1 |
457 | * Set up the outlines dictionary. |
458 | */ |
a615a778 |
459 | if (outlines) { |
f0e51ce1 |
460 | int topcount; |
461 | char buf[80]; |
462 | |
463 | objtext(outlines, "<<\n/Type /Outlines\n"); |
464 | topcount = make_outline(outlines, doc->outline_elements, |
465 | doc->n_outline_elements, TRUE); |
466 | sprintf(buf, "/Count %d\n>>\n", topcount); |
467 | objtext(outlines, buf); |
468 | } |
469 | |
470 | /* |
43341922 |
471 | * Assemble the final linear form of every object. |
472 | */ |
473 | for (o = olist.head; o; o = o->next) { |
474 | rdstringc rs = {0, 0, NULL}; |
475 | char text[80]; |
7e2417cc |
476 | deflate_compress_ctx *zcontext; |
477 | void *zbuf; |
478 | int zlen; |
43341922 |
479 | |
480 | sprintf(text, "%d 0 obj\n", o->number); |
481 | rdaddsc(&rs, text); |
482 | |
483 | if (!o->main.text && o->stream.text) { |
7e2417cc |
484 | zcontext = deflate_compress_new(DEFLATE_TYPE_ZLIB); |
485 | deflate_compress_data(zcontext, o->stream.text, o->stream.pos, |
486 | DEFLATE_END_OF_DATA, &zbuf, &zlen); |
487 | deflate_compress_free(zcontext); |
488 | sprintf(text, "<<\n/Filter/FlateDecode\n/Length %d\n>>\n", zlen); |
43341922 |
489 | rdaddsc(&o->main, text); |
490 | } |
491 | |
492 | assert(o->main.text); |
493 | rdaddsc(&rs, o->main.text); |
494 | sfree(o->main.text); |
495 | |
496 | if (rs.text[rs.pos-1] != '\n') |
497 | rdaddc(&rs, '\n'); |
498 | |
499 | if (o->stream.text) { |
43341922 |
500 | rdaddsc(&rs, "stream\n"); |
7e2417cc |
501 | rdaddsn(&rs, zbuf, zlen); |
43341922 |
502 | rdaddsc(&rs, "\nendstream\n"); |
503 | sfree(o->stream.text); |
7e2417cc |
504 | sfree(zbuf); |
43341922 |
505 | } |
506 | |
507 | rdaddsc(&rs, "endobj\n"); |
508 | |
509 | o->final = rs.text; |
510 | o->size = rs.pos; |
511 | } |
512 | |
513 | /* |
514 | * Write out the PDF file. |
515 | */ |
516 | |
517 | fp = fopen(filename, "wb"); |
518 | if (!fp) { |
519 | error(err_cantopenw, filename); |
520 | return; |
521 | } |
522 | |
523 | /* |
09358aa7 |
524 | * Header. I'm going to put the version IDs in the header as |
7e2417cc |
525 | * well, simply in PDF comments. The PDF Reference also suggests |
526 | * that binary PDF files contain four top-bit-set characters in |
527 | * the second line. |
43341922 |
528 | */ |
7e2417cc |
529 | fileoff = fprintf(fp, "%%PDF-1.3\n%% L\xc3\xba\xc3\xb0""a\n"); |
09358aa7 |
530 | for (p = sourceform; p; p = p->next) |
531 | if (p->type == para_VersionID) |
532 | fileoff += pdf_versionid(fp, p->words); |
43341922 |
533 | |
534 | /* |
535 | * Body |
536 | */ |
537 | for (o = olist.head; o; o = o->next) { |
538 | o->fileoff = fileoff; |
539 | fwrite(o->final, 1, o->size, fp); |
540 | fileoff += o->size; |
541 | } |
542 | |
543 | /* |
544 | * Cross-reference table |
545 | */ |
546 | fprintf(fp, "xref\n"); |
547 | assert(olist.head->number == 1); |
548 | fprintf(fp, "0 %d\n", olist.tail->number + 1); |
549 | fprintf(fp, "0000000000 65535 f \n"); |
550 | for (o = olist.head; o; o = o->next) { |
551 | char entry[40]; |
552 | sprintf(entry, "%010d 00000 n \n", o->fileoff); |
553 | assert(strlen(entry) == 20); |
554 | fputs(entry, fp); |
555 | } |
556 | |
557 | /* |
558 | * Trailer |
559 | */ |
993ade7a |
560 | fprintf(fp, "trailer\n<<\n/Size %d\n/Root %d 0 R\n/Info %d 0 R\n>>\n", |
561 | olist.tail->number + 1, cat->number, info->number); |
43341922 |
562 | fprintf(fp, "startxref\n%d\n%%%%EOF\n", fileoff); |
563 | |
564 | fclose(fp); |
565 | |
566 | sfree(filename); |
567 | } |
568 | |
569 | static object *new_object(objlist *list) |
570 | { |
f1530049 |
571 | object *obj = snew(object); |
43341922 |
572 | |
573 | obj->list = list; |
574 | |
575 | obj->main.text = NULL; |
576 | obj->main.pos = obj->main.size = 0; |
577 | obj->stream.text = NULL; |
578 | obj->stream.pos = obj->stream.size = 0; |
579 | |
580 | obj->number = list->number++; |
581 | |
582 | obj->next = NULL; |
583 | if (list->tail) |
584 | list->tail->next = obj; |
585 | else |
586 | list->head = obj; |
587 | list->tail = obj; |
588 | |
589 | obj->size = 0; |
590 | obj->final = NULL; |
591 | |
592 | return obj; |
593 | } |
594 | |
595 | static void objtext(object *o, char const *text) |
596 | { |
597 | rdaddsc(&o->main, text); |
598 | } |
599 | |
600 | static void objstream(object *o, char const *text) |
601 | { |
602 | rdaddsc(&o->stream, text); |
603 | } |
604 | |
605 | static void objref(object *o, object *dest) |
606 | { |
607 | char buf[40]; |
608 | sprintf(buf, "%d 0 R", dest->number); |
609 | rdaddsc(&o->main, buf); |
610 | } |
611 | |
3e7284e8 |
612 | static void objdest(object *o, page_data *p) { |
613 | objtext(o, "["); |
614 | objref(o, (object *)p->spare); |
615 | objtext(o, "/XYZ null null null]"); |
616 | } |
617 | |
3600720b |
618 | static char const * const stdfonts[] = { |
619 | "Times-Roman", "Times-Bold", "Times-Italic", "Times-BoldItalic", |
620 | "Helvetica", "Helvetica-Bold", "Helvetica-Oblique","Helvetica-BoldOblique", |
621 | "Courier", "Courier-Bold", "Courier-Oblique", "Courier-BoldOblique", |
622 | "Symbol", "ZapfDingbats" |
623 | }; |
624 | |
625 | static int is_std_font(char const *name) { |
626 | unsigned i; |
627 | for (i = 0; i < lenof(stdfonts); i++) |
628 | if (strcmp(name, stdfonts[i]) == 0) |
629 | return TRUE; |
630 | return FALSE; |
631 | } |
632 | |
43341922 |
633 | static void make_pages_node(object *node, object *parent, page_data *first, |
2ff8419e |
634 | page_data *last, object *resources, |
635 | object *mediabox) |
43341922 |
636 | { |
637 | int count; |
638 | page_data *page; |
639 | char buf[80]; |
640 | |
641 | objtext(node, "<<\n/Type /Pages\n"); |
642 | if (parent) { |
643 | objtext(node, "/Parent "); |
644 | objref(node, parent); |
645 | objtext(node, "\n"); |
646 | } |
647 | |
648 | /* |
649 | * Count the pages in this stretch, to see if there are few |
650 | * enough to reference directly. |
651 | */ |
652 | count = 0; |
653 | for (page = first; page; page = page->next) { |
654 | count++; |
655 | if (page == last) |
656 | break; |
657 | } |
658 | |
659 | sprintf(buf, "/Count %d\n/Kids [\n", count); |
660 | objtext(node, buf); |
661 | |
662 | if (count > TREE_BRANCH) { |
663 | int i; |
664 | page_data *thisfirst, *thislast; |
665 | |
666 | page = first; |
667 | |
668 | for (i = 0; i < TREE_BRANCH; i++) { |
669 | int number = (i+1) * count / TREE_BRANCH - i * count / TREE_BRANCH; |
670 | thisfirst = page; |
671 | while (number--) { |
672 | thislast = page; |
673 | page = page->next; |
674 | } |
675 | |
676 | if (thisfirst == thislast) { |
677 | objref(node, (object *)thisfirst->spare); |
678 | objtext((object *)thisfirst->spare, "/Parent "); |
679 | objref((object *)thisfirst->spare, node); |
680 | objtext((object *)thisfirst->spare, "\n"); |
681 | } else { |
682 | object *newnode = new_object(node->list); |
2ff8419e |
683 | make_pages_node(newnode, node, thisfirst, thislast, |
684 | NULL, NULL); |
43341922 |
685 | objref(node, newnode); |
686 | } |
687 | objtext(node, "\n"); |
688 | } |
689 | |
690 | assert(thislast == last || page == NULL); |
691 | |
692 | } else { |
693 | for (page = first; page; page = page->next) { |
694 | objref(node, (object *)page->spare); |
695 | objtext(node, "\n"); |
696 | objtext((object *)page->spare, "/Parent "); |
697 | objref((object *)page->spare, node); |
698 | objtext((object *)page->spare, "\n"); |
699 | if (page == last) |
700 | break; |
701 | } |
702 | } |
703 | |
704 | objtext(node, "]\n"); |
705 | |
706 | if (resources) { |
707 | objtext(node, "/Resources "); |
708 | objref(node, resources); |
709 | objtext(node, "\n"); |
710 | } |
2ff8419e |
711 | if (mediabox) { |
712 | objtext(node, "/MediaBox "); |
713 | objref(node, mediabox); |
714 | objtext(node, "\n"); |
715 | } |
43341922 |
716 | |
717 | objtext(node, ">>\n"); |
718 | } |
f0e51ce1 |
719 | |
720 | /* |
721 | * In text on the page, PDF uses the PostScript font model, which |
722 | * means that glyphs are identified by PS strings and hence font |
723 | * encoding can be managed independently of the supplied encoding |
724 | * of the font. However, in the document outline, the PDF spec |
ce1b04aa |
725 | * encodes in either PDFDocEncoding (a custom superset of |
726 | * ISO-8859-1) or UTF-16BE. |
f0e51ce1 |
727 | */ |
ce1b04aa |
728 | static char *pdf_outline_convert(wchar_t *s, int *len) { |
729 | char *ret; |
730 | |
731 | ret = utoa_careful_dup(s, CS_PDF); |
732 | |
733 | /* |
734 | * Very silly special case: if the returned string begins with |
735 | * FE FF, then the PDF reader will mistake it for a UTF-16BE |
736 | * string. So in this case we give up on PDFDocEncoding and |
737 | * encode it in UTF-16 straight away. |
738 | */ |
739 | if (ret && ret[0] == '\xFE' && ret[1] == '\xFF') { |
740 | sfree(ret); |
741 | ret = NULL; |
f0e51ce1 |
742 | } |
ce1b04aa |
743 | |
744 | if (!ret) { |
745 | ret = utoa_dup_len(s, CS_UTF16BE, len); |
746 | } else { |
747 | *len = strlen(ret); |
f0e51ce1 |
748 | } |
ce1b04aa |
749 | |
750 | return ret; |
f0e51ce1 |
751 | } |
752 | |
f0e51ce1 |
753 | static int make_outline(object *parent, outline_element *items, int n, |
754 | int open) |
755 | { |
756 | int level, totalcount = 0; |
757 | outline_element *itemp; |
758 | object *curr, *prev = NULL, *first = NULL, *last = NULL; |
f0e51ce1 |
759 | |
760 | assert(n > 0); |
761 | |
762 | level = items->level; |
763 | |
764 | while (n > 0) { |
7c8c4239 |
765 | char *title; |
ce1b04aa |
766 | int titlelen; |
f0e51ce1 |
767 | |
768 | /* |
769 | * Here we expect to be sitting on an item at the given |
770 | * level. So we start by constructing an outline entry for |
771 | * that item. |
772 | */ |
773 | assert(items->level == level); |
774 | |
ce1b04aa |
775 | title = pdf_outline_convert(items->pdata->outline_title, &titlelen); |
f0e51ce1 |
776 | |
777 | totalcount++; |
778 | curr = new_object(parent->list); |
779 | if (!first) first = curr; |
780 | last = curr; |
7c8c4239 |
781 | objtext(curr, "<<\n/Title "); |
ce1b04aa |
782 | pdf_string_len(objtext, curr, title, titlelen); |
993ade7a |
783 | sfree(title); |
7c8c4239 |
784 | objtext(curr, "\n/Parent "); |
f0e51ce1 |
785 | objref(curr, parent); |
3e7284e8 |
786 | objtext(curr, "\n/Dest"); |
787 | objdest(curr, items->pdata->first->page); |
788 | objtext(curr, "\n"); |
f0e51ce1 |
789 | if (prev) { |
790 | objtext(curr, "/Prev "); |
791 | objref(curr, prev); |
792 | objtext(curr, "\n"); |
793 | |
794 | objtext(prev, "/Next "); |
795 | objref(prev, curr); |
796 | objtext(prev, "\n>>\n"); |
797 | } |
798 | prev = curr; |
799 | |
800 | items++, n--; |
801 | for (itemp = items; itemp < items+n && itemp->level > level; |
802 | itemp++); |
803 | |
804 | if (itemp > items) { |
805 | char buf[80]; |
806 | int count = make_outline(curr, items, itemp - items, FALSE); |
807 | if (!open) |
808 | count = -count; |
809 | else |
810 | totalcount += count; |
811 | sprintf(buf, "/Count %d\n", count); |
812 | objtext(curr, buf); |
813 | } |
814 | |
815 | n -= itemp - items; |
816 | items = itemp; |
817 | } |
818 | objtext(prev, ">>\n"); |
819 | |
820 | assert(first && last); |
821 | objtext(parent, "/First "); |
822 | objref(parent, first); |
823 | objtext(parent, "\n/Last "); |
824 | objref(parent, last); |
825 | objtext(parent, "\n"); |
826 | |
827 | return totalcount; |
828 | } |
09358aa7 |
829 | |
830 | static int pdf_versionid(FILE *fp, word *words) |
831 | { |
832 | int ret; |
833 | |
834 | ret = fprintf(fp, "%% "); |
835 | |
836 | for (; words; words = words->next) { |
837 | char *text; |
838 | int type; |
839 | |
840 | switch (words->type) { |
841 | case word_HyperLink: |
842 | case word_HyperEnd: |
843 | case word_UpperXref: |
844 | case word_LowerXref: |
845 | case word_XrefEnd: |
846 | case word_IndexRef: |
847 | continue; |
848 | } |
849 | |
850 | type = removeattr(words->type); |
851 | |
852 | switch (type) { |
853 | case word_Normal: |
e4ea58f8 |
854 | text = utoa_dup(words->text, CS_ASCII); |
09358aa7 |
855 | break; |
856 | case word_WhiteSpace: |
857 | text = dupstr(" "); |
858 | break; |
859 | case word_Quote: |
860 | text = dupstr("'"); |
861 | break; |
862 | } |
863 | |
864 | fputs(text, fp); |
865 | ret += strlen(text); |
866 | sfree(text); |
867 | } |
868 | |
869 | ret += fprintf(fp, "\n"); |
870 | |
871 | return ret; |
872 | } |
7c8c4239 |
873 | |
ce1b04aa |
874 | static void pdf_string_len(void (*add)(object *, char const *), |
875 | object *o, char const *str, int len) |
7c8c4239 |
876 | { |
877 | char const *p; |
878 | |
879 | add(o, "("); |
ce1b04aa |
880 | for (p = str; len > 0; p++, len--) { |
881 | char c[10]; |
882 | if (*p < ' ' || *p > '~') { |
883 | sprintf(c, "\\%03o", 0xFF & (int)*p); |
884 | } else { |
885 | int n = 0; |
886 | if (*p == '\\' || *p == '(' || *p == ')') |
887 | c[n++] = '\\'; |
888 | c[n++] = *p; |
889 | c[n] = '\0'; |
890 | } |
7c8c4239 |
891 | add(o, c); |
892 | } |
893 | add(o, ")"); |
894 | } |
ce1b04aa |
895 | |
896 | static void pdf_string(void (*add)(object *, char const *), |
897 | object *o, char const *str) |
898 | { |
899 | pdf_string_len(add, o, str, strlen(str)); |
900 | } |