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); |
993ade7a |
42 | static char *pdf_outline_convert(wchar_t *s, int *len); |
43341922 |
43 | |
3600720b |
44 | static int is_std_font(char const *name); |
45 | |
43341922 |
46 | static void make_pages_node(object *node, object *parent, page_data *first, |
2ff8419e |
47 | page_data *last, object *resources, |
48 | object *mediabox); |
f0e51ce1 |
49 | static int make_outline(object *parent, outline_element *start, int n, |
50 | int open); |
09358aa7 |
51 | static int pdf_versionid(FILE *fp, word *words); |
43341922 |
52 | |
53 | void pdf_backend(paragraph *sourceform, keywordlist *keywords, |
54 | indexdata *idx, void *vdoc) { |
55 | document *doc = (document *)vdoc; |
56 | int font_index; |
57 | font_encoding *fe; |
58 | page_data *page; |
59 | int pageno; |
60 | FILE *fp; |
61 | char *filename; |
62 | paragraph *p; |
63 | objlist olist; |
993ade7a |
64 | object *o, *info, *cat, *outlines, *pages, *resources, *mediabox; |
43341922 |
65 | int fileoff; |
66 | |
67 | IGNORE(keywords); |
68 | IGNORE(idx); |
69 | |
70 | filename = dupstr("output.pdf"); |
71 | for (p = sourceform; p; p = p->next) { |
7738a2fb |
72 | if (p->type == para_Config) { |
43341922 |
73 | if (!ustricmp(p->keyword, L"pdf-filename")) { |
74 | sfree(filename); |
e4ea58f8 |
75 | filename = dupstr(adv(p->origkeyword)); |
43341922 |
76 | } |
77 | } |
78 | } |
79 | |
80 | olist.head = olist.tail = NULL; |
81 | olist.number = 1; |
82 | |
993ade7a |
83 | { |
84 | char buf[256]; |
85 | |
86 | info = new_object(&olist); |
87 | objtext(info, "<<\n"); |
88 | if (doc->n_outline_elements > 0) { |
89 | char *title; |
90 | int titlelen; |
91 | |
92 | title = |
93 | pdf_outline_convert(doc->outline_elements->pdata->outline_title, |
94 | &titlelen); |
95 | objtext(info, "/Title "); |
96 | pdf_string_len(objtext, info, title, titlelen); |
97 | sfree(title); |
98 | objtext(info, "\n"); |
99 | } |
100 | objtext(info, "/Producer "); |
101 | sprintf(buf, "Halibut, %s", version); |
102 | pdf_string(objtext, info, buf); |
103 | objtext(info, "\n>>\n"); |
104 | } |
105 | |
43341922 |
106 | cat = new_object(&olist); |
a615a778 |
107 | if (doc->n_outline_elements > 0) |
108 | outlines = new_object(&olist); |
109 | else |
110 | outlines = NULL; |
43341922 |
111 | pages = new_object(&olist); |
112 | resources = new_object(&olist); |
113 | |
114 | /* |
43341922 |
115 | * The catalogue just contains references to the outlines and |
b7d31949 |
116 | * pages objects, and the pagelabels dictionary. |
43341922 |
117 | */ |
a615a778 |
118 | objtext(cat, "<<\n/Type /Catalog"); |
119 | if (outlines) { |
120 | objtext(cat, "\n/Outlines "); |
121 | objref(cat, outlines); |
122 | } |
43341922 |
123 | objtext(cat, "\n/Pages "); |
124 | objref(cat, pages); |
b7d31949 |
125 | /* Halibut just numbers pages 1, 2, 3, ... */ |
126 | objtext(cat, "\n/PageLabels<</Nums[0<</S/D>>]>>"); |
a615a778 |
127 | if (outlines) |
128 | objtext(cat, "\n/PageMode /UseOutlines"); |
129 | objtext(cat, "\n>>\n"); |
43341922 |
130 | |
131 | /* |
132 | * Set up the resources dictionary, which mostly means |
133 | * providing all the font objects and names to call them by. |
134 | */ |
135 | font_index = 0; |
c2b15a94 |
136 | objtext(resources, "<<\n/ProcSet [/PDF/Text]\n/Font <<\n"); |
43341922 |
137 | for (fe = doc->fonts->head; fe; fe = fe->next) { |
138 | char fname[40]; |
b17a4ef3 |
139 | int i, prev; |
43341922 |
140 | object *font; |
141 | |
142 | sprintf(fname, "f%d", font_index++); |
143 | fe->name = dupstr(fname); |
144 | |
145 | font = new_object(&olist); |
146 | |
147 | objtext(resources, "/"); |
148 | objtext(resources, fe->name); |
149 | objtext(resources, " "); |
150 | objref(resources, font); |
151 | objtext(resources, "\n"); |
152 | |
153 | objtext(font, "<<\n/Type /Font\n/Subtype /Type1\n/Name /"); |
154 | objtext(font, fe->name); |
155 | objtext(font, "\n/BaseFont /"); |
ba0fe3ec |
156 | objtext(font, fe->font->info->name); |
43341922 |
157 | objtext(font, "\n/Encoding <<\n/Type /Encoding\n/Differences ["); |
158 | |
159 | for (i = 0; i < 256; i++) { |
160 | char buf[20]; |
161 | if (!fe->vector[i]) |
162 | continue; |
b17a4ef3 |
163 | if (i != prev + 1) { |
164 | sprintf(buf, "\n%d", i); |
165 | objtext(font, buf); |
166 | } |
167 | objtext(font, i % 8 ? "/" : "\n/"); |
168 | objtext(font, fe->vector[i]); |
169 | prev = i; |
43341922 |
170 | } |
171 | |
172 | objtext(font, "\n]\n>>\n"); |
173 | |
255b7ff3 |
174 | #define FF_FIXEDPITCH 0x00000001 |
175 | #define FF_SERIF 0x00000002 |
176 | #define FF_SYMBOLIC 0x00000004 |
177 | #define FF_SCRIPT 0x00000008 |
178 | #define FF_NONSYMBOLIC 0x00000020 |
179 | #define FF_ITALIC 0x00000040 |
180 | #define FF_ALLCAP 0x00010000 |
181 | #define FF_SMALLCAP 0x00020000 |
182 | #define FF_FORCEBOLD 0x00040000 |
183 | |
3600720b |
184 | if (!is_std_font(fe->font->info->name)){ |
43341922 |
185 | object *widths = new_object(&olist); |
255b7ff3 |
186 | object *fontdesc = new_object(&olist); |
9fb062fc |
187 | int firstchar = -1, lastchar = -1; |
188 | char buf[80]; |
255b7ff3 |
189 | font_info const *fi = fe->font->info; |
190 | int flags; |
9fb062fc |
191 | for (i = 0; i < 256; i++) |
192 | if (fe->indices[i] >= 0) { |
193 | if (firstchar < 0) firstchar = i; |
194 | lastchar = i; |
195 | } |
196 | sprintf(buf, "/FirstChar %d\n/LastChar %d\n/Widths ", |
197 | firstchar, lastchar); |
198 | objtext(font, buf); |
43341922 |
199 | objref(font, widths); |
200 | objtext(font, "\n"); |
201 | objtext(widths, "[\n"); |
9fb062fc |
202 | for (i = firstchar; i <= lastchar; i++) { |
43341922 |
203 | double width; |
204 | if (fe->indices[i] < 0) |
205 | width = 0.0; |
206 | else |
255b7ff3 |
207 | width = fi->widths[fe->indices[i]]; |
17c71b41 |
208 | sprintf(buf, "%g\n", 1000.0 * width / FUNITS_PER_PT); |
43341922 |
209 | objtext(widths, buf); |
210 | } |
211 | objtext(widths, "]\n"); |
255b7ff3 |
212 | objtext(font, "/FontDescriptor "); |
213 | objref(font, fontdesc); |
214 | objtext(fontdesc, "<<\n/Type /FontDescriptor\n/Name /"); |
215 | objtext(fontdesc, fi->name); |
216 | flags = 0; |
217 | if (fi->italicangle) flags |= FF_ITALIC; |
218 | flags |= FF_NONSYMBOLIC; |
219 | sprintf(buf, "\n/Flags %d\n", flags); |
220 | objtext(fontdesc, buf); |
221 | sprintf(buf, "/FontBBox [%g %g %g %g]\n", fi->fontbbox[0], |
222 | fi->fontbbox[1], fi->fontbbox[2], fi->fontbbox[3]); |
223 | objtext(fontdesc, buf); |
224 | sprintf(buf, "/ItalicAngle %g\n", fi->italicangle); |
225 | objtext(fontdesc, buf); |
226 | sprintf(buf, "/Ascent %g\n", fi->ascent); |
227 | objtext(fontdesc, buf); |
228 | sprintf(buf, "/Descent %g\n", fi->descent); |
229 | objtext(fontdesc, buf); |
230 | sprintf(buf, "/CapHeight %g\n", fi->capheight); |
231 | objtext(fontdesc, buf); |
232 | sprintf(buf, "/XHeight %g\n", fi->xheight); |
233 | objtext(fontdesc, buf); |
234 | sprintf(buf, "/StemH %g\n", fi->stemh); |
235 | objtext(fontdesc, buf); |
236 | sprintf(buf, "/StemV %g\n", fi->stemv); |
237 | objtext(fontdesc, buf); |
44407fea |
238 | if (fi->fp) { |
239 | object *fontfile = new_object(&olist); |
240 | char buf[513]; |
241 | size_t len; |
242 | rewind(fi->fp); |
243 | do { |
244 | len = fread(buf, 1, sizeof(buf)-1, fi->fp); |
245 | buf[len] = 0; |
246 | objstream(fontfile, buf); |
247 | } while (len == sizeof(buf)-1); |
248 | objtext(fontdesc, "/FontFile "); |
249 | objref(fontdesc, fontfile); |
250 | } |
251 | objtext(fontdesc, "\n>>\n"); |
43341922 |
252 | } |
253 | |
255b7ff3 |
254 | objtext(font, "\n>>\n"); |
43341922 |
255 | } |
256 | objtext(resources, ">>\n>>\n"); |
257 | |
2ff8419e |
258 | { |
259 | char buf[255]; |
260 | mediabox = new_object(&olist); |
261 | sprintf(buf, "[0 0 %g %g]\n", |
262 | doc->paper_width / FUNITS_PER_PT, |
263 | doc->paper_height / FUNITS_PER_PT); |
264 | objtext(mediabox, buf); |
265 | } |
266 | |
43341922 |
267 | /* |
268 | * Define the page objects for each page, and get each one |
269 | * ready to have a `Parent' specification added to it. |
270 | */ |
271 | for (page = doc->pages; page; page = page->next) { |
272 | object *opage; |
273 | |
274 | opage = new_object(&olist); |
275 | page->spare = opage; |
276 | objtext(opage, "<<\n/Type /Page\n"); |
277 | } |
278 | |
279 | /* |
280 | * Recursively build the page tree. |
281 | */ |
2ff8419e |
282 | make_pages_node(pages, NULL, doc->pages, NULL, resources, mediabox); |
43341922 |
283 | |
284 | /* |
285 | * Create and render the individual pages. |
286 | */ |
287 | pageno = 0; |
288 | for (page = doc->pages; page; page = page->next) { |
289 | object *opage, *cstr; |
23765aeb |
290 | rect *r; |
7c8c4239 |
291 | text_fragment *frag, *frag_end; |
43341922 |
292 | char buf[256]; |
7c8c4239 |
293 | int x, y, lx, ly; |
43341922 |
294 | |
295 | opage = (object *)page->spare; |
296 | /* |
297 | * At this point the page dictionary is already |
298 | * half-written, with /Type and /Parent already present. We |
299 | * continue from there. |
300 | */ |
301 | |
302 | /* |
303 | * The PDF spec says /Resources is required, but also says |
304 | * that it's inheritable and may be omitted if it's present |
305 | * in a Pages node. In our case it is: it's present in the |
306 | * topmost /Pages node because we carefully put it there. |
2ff8419e |
307 | * So we don't need a /Resources entry here. The same applies |
308 | * to /MediaBox. |
43341922 |
309 | */ |
43341922 |
310 | |
311 | /* |
312 | * Now we're ready to define a content stream containing |
313 | * the actual text on the page. |
314 | */ |
315 | cstr = new_object(&olist); |
316 | objtext(opage, "/Contents "); |
317 | objref(opage, cstr); |
318 | objtext(opage, "\n"); |
319 | |
23765aeb |
320 | /* |
321 | * Render any rectangles on the page. |
322 | */ |
323 | for (r = page->first_rect; r; r = r->next) { |
324 | char buf[512]; |
17c71b41 |
325 | sprintf(buf, "%g %g %g %g re f\n", |
326 | r->x / FUNITS_PER_PT, r->y / FUNITS_PER_PT, |
327 | r->w / FUNITS_PER_PT, r->h / FUNITS_PER_PT); |
23765aeb |
328 | objstream(cstr, buf); |
329 | } |
330 | |
43341922 |
331 | objstream(cstr, "BT\n"); |
43341922 |
332 | |
7c8c4239 |
333 | /* |
334 | * PDF tracks two separate current positions: the position |
335 | * given in the `line matrix' and the position given in the |
336 | * `text matrix'. We must therefore track both as well. |
337 | * They start off at -1 (unset). |
338 | */ |
339 | lx = ly = -1; |
340 | x = y = -1; |
341 | |
342 | frag = page->first_text; |
343 | while (frag) { |
344 | /* |
345 | * For compactness, I'm going to group text fragments |
346 | * into subsequences that use the same font+size. So |
347 | * first find the end of this subsequence. |
348 | */ |
349 | for (frag_end = frag; |
350 | (frag_end && |
351 | frag_end->fe == frag->fe && |
352 | frag_end->fontsize == frag->fontsize); |
353 | frag_end = frag_end->next); |
354 | |
355 | /* |
356 | * Now select the text fragment, and prepare to display |
357 | * the text. |
358 | */ |
43341922 |
359 | objstream(cstr, "/"); |
360 | objstream(cstr, frag->fe->name); |
7c8c4239 |
361 | sprintf(buf, " %d Tf ", frag->fontsize); |
43341922 |
362 | objstream(cstr, buf); |
363 | |
7c8c4239 |
364 | while (frag && frag != frag_end) { |
365 | /* |
366 | * Place the text position for the first piece of |
367 | * text. |
368 | */ |
369 | if (lx < 0) { |
370 | sprintf(buf, "1 0 0 1 %g %g Tm ", |
17c71b41 |
371 | frag->x/FUNITS_PER_PT, frag->y/FUNITS_PER_PT); |
7c8c4239 |
372 | } else { |
373 | sprintf(buf, "%g %g Td ", |
17c71b41 |
374 | (frag->x - lx)/FUNITS_PER_PT, |
375 | (frag->y - ly)/FUNITS_PER_PT); |
7c8c4239 |
376 | } |
43341922 |
377 | objstream(cstr, buf); |
7c8c4239 |
378 | lx = x = frag->x; |
379 | ly = y = frag->y; |
380 | |
381 | /* |
382 | * See if we're going to use Tj (show a single |
383 | * string) or TJ (show an array of strings with |
384 | * x-spacings between them). We determine this by |
385 | * seeing if there's more than one text fragment in |
386 | * sequence with the same y-coordinate. |
387 | */ |
388 | if (frag->next && frag->next != frag_end && |
389 | frag->next->y == y) { |
390 | /* |
391 | * The TJ strategy. |
392 | */ |
393 | objstream(cstr, "["); |
394 | while (frag && frag != frag_end && frag->y == y) { |
395 | if (frag->x != x) { |
396 | sprintf(buf, "%g", |
397 | (x - frag->x) * 1000.0 / |
17c71b41 |
398 | (FUNITS_PER_PT * frag->fontsize)); |
7c8c4239 |
399 | objstream(cstr, buf); |
400 | } |
401 | pdf_string(objstream, cstr, frag->text); |
402 | x = frag->x + frag->width; |
403 | frag = frag->next; |
404 | } |
405 | objstream(cstr, "]TJ\n"); |
406 | } else |
407 | { |
408 | /* |
409 | * The Tj strategy. |
410 | */ |
411 | pdf_string(objstream, cstr, frag->text); |
412 | objstream(cstr, "Tj\n"); |
413 | frag = frag->next; |
414 | } |
43341922 |
415 | } |
43341922 |
416 | } |
417 | objstream(cstr, "ET"); |
418 | |
138d7ffb |
419 | /* |
420 | * Also, we want an annotation dictionary containing the |
421 | * cross-references from this page. |
422 | */ |
423 | if (page->first_xref) { |
424 | xref *xr; |
425 | objtext(opage, "/Annots [\n"); |
426 | |
427 | for (xr = page->first_xref; xr; xr = xr->next) { |
138d7ffb |
428 | char buf[256]; |
429 | |
6e4d0fd8 |
430 | objtext(opage, "<</Subtype/Link\n/Rect["); |
138d7ffb |
431 | sprintf(buf, "%g %g %g %g", |
17c71b41 |
432 | xr->lx / FUNITS_PER_PT, xr->by / FUNITS_PER_PT, |
433 | xr->rx / FUNITS_PER_PT, xr->ty / FUNITS_PER_PT); |
6e4d0fd8 |
434 | objtext(opage, buf); |
435 | objtext(opage, "]/Border[0 0 0]\n"); |
138d7ffb |
436 | |
437 | if (xr->dest.type == PAGE) { |
6e4d0fd8 |
438 | objtext(opage, "/Dest["); |
439 | objref(opage, (object *)xr->dest.page->spare); |
440 | objtext(opage, "/XYZ null null null]"); |
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 | |
3600720b |
612 | static char const * const stdfonts[] = { |
613 | "Times-Roman", "Times-Bold", "Times-Italic", "Times-BoldItalic", |
614 | "Helvetica", "Helvetica-Bold", "Helvetica-Oblique","Helvetica-BoldOblique", |
615 | "Courier", "Courier-Bold", "Courier-Oblique", "Courier-BoldOblique", |
616 | "Symbol", "ZapfDingbats" |
617 | }; |
618 | |
619 | static int is_std_font(char const *name) { |
620 | unsigned i; |
621 | for (i = 0; i < lenof(stdfonts); i++) |
622 | if (strcmp(name, stdfonts[i]) == 0) |
623 | return TRUE; |
624 | return FALSE; |
625 | } |
626 | |
43341922 |
627 | static void make_pages_node(object *node, object *parent, page_data *first, |
2ff8419e |
628 | page_data *last, object *resources, |
629 | object *mediabox) |
43341922 |
630 | { |
631 | int count; |
632 | page_data *page; |
633 | char buf[80]; |
634 | |
635 | objtext(node, "<<\n/Type /Pages\n"); |
636 | if (parent) { |
637 | objtext(node, "/Parent "); |
638 | objref(node, parent); |
639 | objtext(node, "\n"); |
640 | } |
641 | |
642 | /* |
643 | * Count the pages in this stretch, to see if there are few |
644 | * enough to reference directly. |
645 | */ |
646 | count = 0; |
647 | for (page = first; page; page = page->next) { |
648 | count++; |
649 | if (page == last) |
650 | break; |
651 | } |
652 | |
653 | sprintf(buf, "/Count %d\n/Kids [\n", count); |
654 | objtext(node, buf); |
655 | |
656 | if (count > TREE_BRANCH) { |
657 | int i; |
658 | page_data *thisfirst, *thislast; |
659 | |
660 | page = first; |
661 | |
662 | for (i = 0; i < TREE_BRANCH; i++) { |
663 | int number = (i+1) * count / TREE_BRANCH - i * count / TREE_BRANCH; |
664 | thisfirst = page; |
665 | while (number--) { |
666 | thislast = page; |
667 | page = page->next; |
668 | } |
669 | |
670 | if (thisfirst == thislast) { |
671 | objref(node, (object *)thisfirst->spare); |
672 | objtext((object *)thisfirst->spare, "/Parent "); |
673 | objref((object *)thisfirst->spare, node); |
674 | objtext((object *)thisfirst->spare, "\n"); |
675 | } else { |
676 | object *newnode = new_object(node->list); |
2ff8419e |
677 | make_pages_node(newnode, node, thisfirst, thislast, |
678 | NULL, NULL); |
43341922 |
679 | objref(node, newnode); |
680 | } |
681 | objtext(node, "\n"); |
682 | } |
683 | |
684 | assert(thislast == last || page == NULL); |
685 | |
686 | } else { |
687 | for (page = first; page; page = page->next) { |
688 | objref(node, (object *)page->spare); |
689 | objtext(node, "\n"); |
690 | objtext((object *)page->spare, "/Parent "); |
691 | objref((object *)page->spare, node); |
692 | objtext((object *)page->spare, "\n"); |
693 | if (page == last) |
694 | break; |
695 | } |
696 | } |
697 | |
698 | objtext(node, "]\n"); |
699 | |
700 | if (resources) { |
701 | objtext(node, "/Resources "); |
702 | objref(node, resources); |
703 | objtext(node, "\n"); |
704 | } |
2ff8419e |
705 | if (mediabox) { |
706 | objtext(node, "/MediaBox "); |
707 | objref(node, mediabox); |
708 | objtext(node, "\n"); |
709 | } |
43341922 |
710 | |
711 | objtext(node, ">>\n"); |
712 | } |
f0e51ce1 |
713 | |
714 | /* |
715 | * In text on the page, PDF uses the PostScript font model, which |
716 | * means that glyphs are identified by PS strings and hence font |
717 | * encoding can be managed independently of the supplied encoding |
718 | * of the font. However, in the document outline, the PDF spec |
ce1b04aa |
719 | * encodes in either PDFDocEncoding (a custom superset of |
720 | * ISO-8859-1) or UTF-16BE. |
f0e51ce1 |
721 | */ |
ce1b04aa |
722 | static char *pdf_outline_convert(wchar_t *s, int *len) { |
723 | char *ret; |
724 | |
725 | ret = utoa_careful_dup(s, CS_PDF); |
726 | |
727 | /* |
728 | * Very silly special case: if the returned string begins with |
729 | * FE FF, then the PDF reader will mistake it for a UTF-16BE |
730 | * string. So in this case we give up on PDFDocEncoding and |
731 | * encode it in UTF-16 straight away. |
732 | */ |
733 | if (ret && ret[0] == '\xFE' && ret[1] == '\xFF') { |
734 | sfree(ret); |
735 | ret = NULL; |
f0e51ce1 |
736 | } |
ce1b04aa |
737 | |
738 | if (!ret) { |
739 | ret = utoa_dup_len(s, CS_UTF16BE, len); |
740 | } else { |
741 | *len = strlen(ret); |
f0e51ce1 |
742 | } |
ce1b04aa |
743 | |
744 | return ret; |
f0e51ce1 |
745 | } |
746 | |
f0e51ce1 |
747 | static int make_outline(object *parent, outline_element *items, int n, |
748 | int open) |
749 | { |
750 | int level, totalcount = 0; |
751 | outline_element *itemp; |
752 | object *curr, *prev = NULL, *first = NULL, *last = NULL; |
f0e51ce1 |
753 | |
754 | assert(n > 0); |
755 | |
756 | level = items->level; |
757 | |
758 | while (n > 0) { |
7c8c4239 |
759 | char *title; |
ce1b04aa |
760 | int titlelen; |
f0e51ce1 |
761 | |
762 | /* |
763 | * Here we expect to be sitting on an item at the given |
764 | * level. So we start by constructing an outline entry for |
765 | * that item. |
766 | */ |
767 | assert(items->level == level); |
768 | |
ce1b04aa |
769 | title = pdf_outline_convert(items->pdata->outline_title, &titlelen); |
f0e51ce1 |
770 | |
771 | totalcount++; |
772 | curr = new_object(parent->list); |
773 | if (!first) first = curr; |
774 | last = curr; |
7c8c4239 |
775 | objtext(curr, "<<\n/Title "); |
ce1b04aa |
776 | pdf_string_len(objtext, curr, title, titlelen); |
993ade7a |
777 | sfree(title); |
7c8c4239 |
778 | objtext(curr, "\n/Parent "); |
f0e51ce1 |
779 | objref(curr, parent); |
780 | objtext(curr, "\n/Dest ["); |
be76d597 |
781 | objref(curr, (object *)items->pdata->first->page->spare); |
f0e51ce1 |
782 | objtext(curr, " /XYZ null null null]\n"); |
783 | if (prev) { |
784 | objtext(curr, "/Prev "); |
785 | objref(curr, prev); |
786 | objtext(curr, "\n"); |
787 | |
788 | objtext(prev, "/Next "); |
789 | objref(prev, curr); |
790 | objtext(prev, "\n>>\n"); |
791 | } |
792 | prev = curr; |
793 | |
794 | items++, n--; |
795 | for (itemp = items; itemp < items+n && itemp->level > level; |
796 | itemp++); |
797 | |
798 | if (itemp > items) { |
799 | char buf[80]; |
800 | int count = make_outline(curr, items, itemp - items, FALSE); |
801 | if (!open) |
802 | count = -count; |
803 | else |
804 | totalcount += count; |
805 | sprintf(buf, "/Count %d\n", count); |
806 | objtext(curr, buf); |
807 | } |
808 | |
809 | n -= itemp - items; |
810 | items = itemp; |
811 | } |
812 | objtext(prev, ">>\n"); |
813 | |
814 | assert(first && last); |
815 | objtext(parent, "/First "); |
816 | objref(parent, first); |
817 | objtext(parent, "\n/Last "); |
818 | objref(parent, last); |
819 | objtext(parent, "\n"); |
820 | |
821 | return totalcount; |
822 | } |
09358aa7 |
823 | |
824 | static int pdf_versionid(FILE *fp, word *words) |
825 | { |
826 | int ret; |
827 | |
828 | ret = fprintf(fp, "%% "); |
829 | |
830 | for (; words; words = words->next) { |
831 | char *text; |
832 | int type; |
833 | |
834 | switch (words->type) { |
835 | case word_HyperLink: |
836 | case word_HyperEnd: |
837 | case word_UpperXref: |
838 | case word_LowerXref: |
839 | case word_XrefEnd: |
840 | case word_IndexRef: |
841 | continue; |
842 | } |
843 | |
844 | type = removeattr(words->type); |
845 | |
846 | switch (type) { |
847 | case word_Normal: |
e4ea58f8 |
848 | text = utoa_dup(words->text, CS_ASCII); |
09358aa7 |
849 | break; |
850 | case word_WhiteSpace: |
851 | text = dupstr(" "); |
852 | break; |
853 | case word_Quote: |
854 | text = dupstr("'"); |
855 | break; |
856 | } |
857 | |
858 | fputs(text, fp); |
859 | ret += strlen(text); |
860 | sfree(text); |
861 | } |
862 | |
863 | ret += fprintf(fp, "\n"); |
864 | |
865 | return ret; |
866 | } |
7c8c4239 |
867 | |
ce1b04aa |
868 | static void pdf_string_len(void (*add)(object *, char const *), |
869 | object *o, char const *str, int len) |
7c8c4239 |
870 | { |
871 | char const *p; |
872 | |
873 | add(o, "("); |
ce1b04aa |
874 | for (p = str; len > 0; p++, len--) { |
875 | char c[10]; |
876 | if (*p < ' ' || *p > '~') { |
877 | sprintf(c, "\\%03o", 0xFF & (int)*p); |
878 | } else { |
879 | int n = 0; |
880 | if (*p == '\\' || *p == '(' || *p == ')') |
881 | c[n++] = '\\'; |
882 | c[n++] = *p; |
883 | c[n] = '\0'; |
884 | } |
7c8c4239 |
885 | add(o, c); |
886 | } |
887 | add(o, ")"); |
888 | } |
ce1b04aa |
889 | |
890 | static void pdf_string(void (*add)(object *, char const *), |
891 | object *o, char const *str) |
892 | { |
893 | pdf_string_len(add, o, str, strlen(str)); |
894 | } |