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bk_pdf.c
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bk_pdf.c
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/*
* PDF backend for Halibut
*/
#include <assert.h>
#include "halibut.h"
#include "paper.h"
#include "deflate.h"
#define TREE_BRANCH 8 /* max branching factor in page tree */
paragraph *pdf_config_filename(char *filename)
{
return cmdline_cfg_simple("pdf-filename", filename, NULL);
}
struct object_Tag {
objlist *list;
object *next;
int number;
rdstringc main, stream;
int size, fileoff;
char *final;
};
struct objlist_Tag {
int number;
object *head, *tail;
};
static void pdf_string(void (*add)(object *, char const *),
object *, char const *);
static void pdf_string_len(void (*add)(object *, char const *),
object *, char const *, int);
static void objref(object *o, object *dest);
static void objdest(object *o, page_data *p);
static bool is_std_font(char const *name);
static void make_pages_node(object *node, object *parent, page_data *first,
page_data *last, object *resources,
object *mediabox);
static int make_outline(object *parent, outline_element *start, int n,
bool open);
static int pdf_versionid(FILE *fp, word *words);
void pdf_backend(paragraph *sourceform, keywordlist *keywords,
indexdata *idx, void *vdoc, errorstate *es) {
document *doc = (document *)vdoc;
int font_index;
font_encoding *fe;
page_data *page;
FILE *fp;
char *filename;
paragraph *p;
objlist olist;
object *o, *info, *cat, *outlines, *pages, *resources, *mediabox;
int fileoff;
IGNORE(keywords);
IGNORE(idx);
filename = dupstr("output.pdf");
for (p = sourceform; p; p = p->next) {
if (p->type == para_Config) {
if (!ustricmp(p->keyword, L"pdf-filename")) {
sfree(filename);
filename = dupstr(adv(p->origkeyword));
}
}
}
olist.head = olist.tail = NULL;
olist.number = 1;
{
char buf[256];
info = new_object(&olist);
objtext(info, "<<\n");
if (doc->n_outline_elements > 0) {
char *title;
int titlelen;
title =
pdf_outline_convert(doc->outline_elements->pdata->outline_title,
&titlelen);
objtext(info, "/Title ");
pdf_string_len(objtext, info, title, titlelen);
sfree(title);
objtext(info, "\n");
}
objtext(info, "/Producer ");
sprintf(buf, "Halibut, %s", version);
pdf_string(objtext, info, buf);
objtext(info, "\n>>\n");
}
cat = new_object(&olist);
if (doc->n_outline_elements > 0)
outlines = new_object(&olist);
else
outlines = NULL;
pages = new_object(&olist);
resources = new_object(&olist);
/*
* The catalogue just contains references to the outlines and
* pages objects, and the pagelabels dictionary.
*/
objtext(cat, "<<\n/Type /Catalog");
if (outlines) {
objtext(cat, "\n/Outlines ");
objref(cat, outlines);
}
objtext(cat, "\n/Pages ");
objref(cat, pages);
/* Halibut just numbers pages 1, 2, 3, ... */
objtext(cat, "\n/PageLabels<</Nums[0<</S/D>>]>>");
if (outlines)
objtext(cat, "\n/PageMode /UseOutlines");
objtext(cat, "\n>>\n");
/*
* Set up the resources dictionary, which mostly means
* providing all the font objects and names to call them by.
*/
font_index = 0;
objtext(resources, "<<\n/ProcSet [/PDF/Text]\n/Font <<\n");
for (fe = doc->fonts->head; fe; fe = fe->next) {
char fname[40];
char buf[80];
int i, prev;
object *font, *fontdesc = NULL;
int flags;
font_info const *fi = fe->font->info;
sprintf(fname, "f%d", font_index++);
fe->name = dupstr(fname);
font = new_object(&olist);
objtext(resources, "/");
objtext(resources, fe->name);
objtext(resources, " ");
objref(resources, font);
objtext(resources, "\n");
/*
* Construct those parts of the font descriptor that don't dependd
* on the file format.
*/
if (!is_std_font(fe->font->info->name)) {
fontdesc = new_object(&olist);
#define FF_FIXEDPITCH 0x00000001
#define FF_SERIF 0x00000002
#define FF_SYMBOLIC 0x00000004
#define FF_SCRIPT 0x00000008
#define FF_NONSYMBOLIC 0x00000020
#define FF_ITALIC 0x00000040
#define FF_ALLCAP 0x00010000
#define FF_SMALLCAP 0x00020000
#define FF_FORCEBOLD 0x00040000
objtext(fontdesc, "<<\n/Type /FontDescriptor\n/Name /");
objtext(fontdesc, fi->name);
flags = 0;
if (fi->italicangle) flags |= FF_ITALIC;
flags |= FF_NONSYMBOLIC;
sprintf(buf, "\n/Flags %d\n", flags);
objtext(fontdesc, buf);
sprintf(buf, "/FontBBox [%g %g %g %g]\n", fi->fontbbox[0],
fi->fontbbox[1], fi->fontbbox[2], fi->fontbbox[3]);
objtext(fontdesc, buf);
sprintf(buf, "/ItalicAngle %g\n", fi->italicangle);
objtext(fontdesc, buf);
sprintf(buf, "/Ascent %g\n", fi->ascent);
objtext(fontdesc, buf);
sprintf(buf, "/Descent %g\n", fi->descent);
objtext(fontdesc, buf);
sprintf(buf, "/CapHeight %g\n", fi->capheight);
objtext(fontdesc, buf);
sprintf(buf, "/XHeight %g\n", fi->xheight);
objtext(fontdesc, buf);
sprintf(buf, "/StemH %g\n", fi->stemh);
objtext(fontdesc, buf);
sprintf(buf, "/StemV %g\n", fi->stemv);
objtext(fontdesc, buf);
}
objtext(font, "<<\n/Type /Font\n/BaseFont /");
objtext(font, fe->font->info->name);
if (fe->font->info->filetype == TRUETYPE) {
object *cidfont = new_object(&olist);
object *cmap = new_object(&olist);
unsigned short ranges[256];
unsigned startidx, nranges, nchars;
int start;
objtext(font, "/Subtype/Type0\n/Encoding ");
objtext(cmap, "<</Type/CMap\n/CMapName/");
objtext(cmap, fe->name);
objtext(cmap, "\n/CIDSystemInfo<</Registry(Adobe)"
"/Ordering(Identity)/Supplement 0>>\n");
objstream(cmap, "%!PS-Adobe-3.0 Resource-CMap\n"
"%%DocumentNeededResources: procset CIDInit\n"
"%%IncludeResource: procset CIDInit\n"
"%%BeginResource: CMap ");
objstream(cmap, fe->name);
objstream(cmap, "\n%%Title (");
objstream(cmap, fe->name);
objstream(cmap, " Adobe Identity 0)\n%%Version: 1\n%%EndComments\n");
objstream(cmap, "/CIDInit/ProcSet findresource begin\n");
objstream(cmap, "12 dict begin begincmap\n");
objstream(cmap, "/CIDSystemInfo 3 dict dup begin\n"
"/Registry(Adobe)def/Ordering(Identity)def"
"/Supplement 0 def end def\n");
objstream(cmap, "/CMapName/");
objstream(cmap, fe->name);
objstream(cmap, " def/CMapType 0 def/WMode 0 def\n");
objstream(cmap, "1 begincodespacerange<00><FF>"
"endcodespacerange\n");
start = -1; nranges = nchars = 0;
for (i = 0; i < 256; i++) {
unsigned idx;
ranges[i] = 0;
if (fe->vector[i] == NOGLYPH)
continue;
idx = sfnt_glyphtoindex(fe->font->info->fontfile,
fe->vector[i]);
if (start >= 0 && idx - startidx == (unsigned)(i - start)) {
if (ranges[start] == 1) {
nranges++; nchars--;
}
ranges[start] = i - start + 1;
} else {
ranges[i] = 1;
start = i;
startidx = idx;
nchars++;
}
}
i = 0;
while (nranges) {
unsigned blk = nranges > 100 ? 100 : nranges;
nranges -= blk;
sprintf(buf, "%u ", blk);
objstream(cmap, buf);
objstream(cmap, "begincidrange\n");
while (blk) {
if (ranges[i] > 1) {
sprintf(buf, "<%02X>", i);
objstream(cmap, buf);
sprintf(buf, "<%02X>", i + ranges[i] - 1);
objstream(cmap, buf);
sprintf(buf, "%hu\n",
(unsigned short)
sfnt_glyphtoindex(fe->font->info->fontfile,
fe->vector[i]));
objstream(cmap, buf);
blk--;
}
i++;
}
objstream(cmap, "endcidrange\n");
}
i = 0;
while (nchars) {
unsigned blk = nchars > 100 ? 100 : nchars;
nchars -= blk;
sprintf(buf, "%u ", blk);
objstream(cmap, buf);
objstream(cmap, "begincidchar\n");
while (blk) {
if (ranges[i] == 1) {
sprintf(buf, "<%02X>", i);
objstream(cmap, buf);
sprintf(buf, "%hu\n",
(unsigned short)
sfnt_glyphtoindex(fe->font->info->fontfile,
fe->vector[i]));
objstream(cmap, buf);
blk--;
}
i++;
}
objstream(cmap, "endcidchar\n");
}
objstream(cmap, "endcmap CMapName currentdict /CMap "
"defineresource pop end end\n%%EndResource\n%%EOF\n");
objref(font, cmap);
objtext(font, "\n/DescendantFonts[");
objref(font, cidfont);
objtext(font, "]\n");
objtext(cidfont, "<<\n/Type/Font\n/Subtype/CIDFontType2\n"
"/BaseFont/");
objtext(cidfont, fe->font->info->name);
objtext(cidfont, "\n/CIDSystemInfo<</Registry(Adobe)"
"/Ordering(Identity)/Supplement 0>>\n");
assert(fontdesc); /* TrueType fonts are never standard */
objtext(cidfont, "/FontDescriptor ");
objref(cidfont, fontdesc);
objtext(cidfont, "\n/W[0[");
for (i = 0; i < (int)sfnt_nglyphs(fe->font->info->fontfile); i++) {
char buf[20];
double width;
width = find_width(fe->font,
sfnt_indextoglyph(fe->font->info->fontfile, i));
sprintf(buf, "%g ", 1000.0 * width / FUNITS_PER_PT);
objtext(cidfont, buf);
}
objtext(cidfont, "]]>>\n");
} else {
objtext(font, "/Subtype /Type1\n");
objtext(font, "\n/Encoding <<\n/Type /Encoding\n/Differences [");
prev = 256; /* ensure we compare unequal in 1st iteration */
for (i = 0; i < 256; i++) {
char buf[20];
if (fe->vector[i] == NOGLYPH)
continue;
if (i != prev + 1) {
sprintf(buf, "\n%d", i);
objtext(font, buf);
}
objtext(font, i % 8 ? "/" : "\n/");
objtext(font, glyph_extern(doc->psd, fe->vector[i]));
prev = i;
}
objtext(font, "\n]\n>>\n");
if (!is_std_font(fe->font->info->name)){
object *widths = new_object(&olist);
int firstchar = -1, lastchar = -1;
for (i = 0; i < 256; i++)
if (fe->vector[i] != NOGLYPH) {
if (firstchar < 0) firstchar = i;
lastchar = i;
}
sprintf(buf, "/FirstChar %d\n/LastChar %d\n/Widths ",
firstchar, lastchar);
objtext(font, buf);
objref(font, widths);
objtext(font, "\n");
objtext(widths, "[\n");
for (i = firstchar; i <= lastchar; i++) {
double width;
if (fe->vector[i] == NOGLYPH)
width = 0.0;
else
width = find_width(fe->font, fe->vector[i]);
sprintf(buf, "%g\n", 1000.0 * width / FUNITS_PER_PT);
objtext(widths, buf);
}
objtext(widths, "]\n");
objtext(font, "/FontDescriptor ");
objref(font, fontdesc);
}
}
if (!is_std_font(fe->font->info->name)) {
if (fi->fontfile && fi->filetype == TYPE1) {
object *fontfile = new_object(&olist);
size_t len;
char *ffbuf;
pf_part1((font_info *)fi, &ffbuf, &len, es);
objstream_len(fontfile, ffbuf, len);
sfree(ffbuf);
sprintf(buf, "<<\n/Length1 %lu\n", (unsigned long)len);
objtext(fontfile, buf);
pf_part2((font_info *)fi, &ffbuf, &len, es);
objstream_len(fontfile, ffbuf, len);
sfree(ffbuf);
sprintf(buf, "/Length2 %lu\n", (unsigned long)len);
objtext(fontfile, buf);
objtext(fontfile, "/Length3 0\n");
objtext(fontdesc, "/FontFile ");
objref(fontdesc, fontfile);
} else if (fi->fontfile && fi->filetype == TRUETYPE) {
object *fontfile = new_object(&olist);
size_t len;
char *ffbuf;
sfnt_data((font_info *)fi, &ffbuf, &len);
objstream_len(fontfile, ffbuf, len);
sprintf(buf, "<<\n/Length1 %lu\n", (unsigned long)len);
objtext(fontfile, buf);
objtext(fontdesc, "/FontFile2 ");
objref(fontdesc, fontfile);
}
objtext(fontdesc, "\n>>\n");
}
objtext(font, "\n>>\n");
}
objtext(resources, ">>\n>>\n");
{
char buf[255];
mediabox = new_object(&olist);
sprintf(buf, "[0 0 %g %g]\n",
doc->paper_width / FUNITS_PER_PT,
doc->paper_height / FUNITS_PER_PT);
objtext(mediabox, buf);
}
/*
* Define the page objects for each page, and get each one
* ready to have a `Parent' specification added to it.
*/
for (page = doc->pages; page; page = page->next) {
object *opage;
opage = new_object(&olist);
page->spare = opage;
objtext(opage, "<<\n/Type /Page\n");
}
/*
* Recursively build the page tree.
*/
make_pages_node(pages, NULL, doc->pages, NULL, resources, mediabox);
/*
* Create and render the individual pages.
*/
for (page = doc->pages; page; page = page->next) {
object *opage, *cstr;
rect *r;
text_fragment *frag, *frag_end;
char buf[256];
int x, y, lx, ly;
opage = (object *)page->spare;
/*
* At this point the page dictionary is already
* half-written, with /Type and /Parent already present. We
* continue from there.
*/
/*
* The PDF spec says /Resources is required, but also says
* that it's inheritable and may be omitted if it's present
* in a Pages node. In our case it is: it's present in the
* topmost /Pages node because we carefully put it there.
* So we don't need a /Resources entry here. The same applies
* to /MediaBox.
*/
/*
* Now we're ready to define a content stream containing
* the actual text on the page.
*/
cstr = new_object(&olist);
objtext(opage, "/Contents ");
objref(opage, cstr);
objtext(opage, "\n");
/*
* Render any rectangles on the page.
*/
for (r = page->first_rect; r; r = r->next) {
char buf[512];
sprintf(buf, "%g %g %g %g re f\n",
r->x / FUNITS_PER_PT, r->y / FUNITS_PER_PT,
r->w / FUNITS_PER_PT, r->h / FUNITS_PER_PT);
objstream(cstr, buf);
}
objstream(cstr, "BT\n");
/*
* PDF tracks two separate current positions: the position
* given in the `line matrix' and the position given in the
* `text matrix'. We must therefore track both as well.
* They start off at -1 (unset).
*/
lx = ly = -1;
x = y = -1;
frag = page->first_text;
while (frag) {
/*
* For compactness, I'm going to group text fragments
* into subsequences that use the same font+size. So
* first find the end of this subsequence.
*/
for (frag_end = frag;
(frag_end &&
frag_end->fe == frag->fe &&
frag_end->fontsize == frag->fontsize);
frag_end = frag_end->next);
/*
* Now select the text fragment, and prepare to display
* the text.
*/
objstream(cstr, "/");
objstream(cstr, frag->fe->name);
sprintf(buf, " %d Tf ", frag->fontsize);
objstream(cstr, buf);
while (frag && frag != frag_end) {
/*
* Place the text position for the first piece of
* text.
*/
if (lx < 0) {
sprintf(buf, "1 0 0 1 %g %g Tm ",
frag->x/FUNITS_PER_PT, frag->y/FUNITS_PER_PT);
} else {
sprintf(buf, "%g %g Td ",
(frag->x - lx)/FUNITS_PER_PT,
(frag->y - ly)/FUNITS_PER_PT);
}
objstream(cstr, buf);
lx = x = frag->x;
ly = y = frag->y;
/*
* See if we're going to use Tj (show a single
* string) or TJ (show an array of strings with
* x-spacings between them). We determine this by
* seeing if there's more than one text fragment in
* sequence with the same y-coordinate.
*/
if (frag->next && frag->next != frag_end &&
frag->next->y == y) {
/*
* The TJ strategy.
*/
objstream(cstr, "[");
while (frag && frag != frag_end && frag->y == y) {
if (frag->x != x) {
sprintf(buf, "%g",
(x - frag->x) * 1000.0 /
(FUNITS_PER_PT * frag->fontsize));
objstream(cstr, buf);
}
pdf_string(objstream, cstr, frag->text);
x = frag->x + frag->width;
frag = frag->next;
}
objstream(cstr, "]TJ\n");
} else
{
/*
* The Tj strategy.
*/
pdf_string(objstream, cstr, frag->text);
objstream(cstr, "Tj\n");
frag = frag->next;
}
}
}
objstream(cstr, "ET");
/*
* Also, we want an annotation dictionary containing the
* cross-references from this page.
*/
if (page->first_xref) {
xref *xr;
objtext(opage, "/Annots [\n");
for (xr = page->first_xref; xr; xr = xr->next) {
char buf[256];
objtext(opage, "<</Subtype/Link\n/Rect[");
sprintf(buf, "%g %g %g %g",
xr->lx / FUNITS_PER_PT, xr->by / FUNITS_PER_PT,
xr->rx / FUNITS_PER_PT, xr->ty / FUNITS_PER_PT);
objtext(opage, buf);
objtext(opage, "]/Border[0 0 0]\n");
if (xr->dest.type == PAGE) {
objtext(opage, "/Dest");
objdest(opage, xr->dest.page);
} else {
objtext(opage, "/A<</S/URI/URI");
pdf_string(objtext, opage, xr->dest.url);
objtext(opage, ">>");
}
objtext(opage, ">>\n");
}
objtext(opage, "]\n");
}
objtext(opage, ">>\n");
}
/*
* Set up the outlines dictionary.
*/
if (outlines) {
int topcount;
char buf[80];
objtext(outlines, "<<\n/Type /Outlines\n");
topcount = make_outline(outlines, doc->outline_elements,
doc->n_outline_elements, true);
sprintf(buf, "/Count %d\n>>\n", topcount);
objtext(outlines, buf);
}
/*
* Assemble the final linear form of every object.
*/
for (o = olist.head; o; o = o->next) {
rdstringc rs = {0, 0, NULL};
char text[80];
deflate_compress_ctx *zcontext;
void *zbuf;
int zlen;
sprintf(text, "%d 0 obj\n", o->number);
rdaddsc(&rs, text);
if (o->stream.text) {
if (!o->main.text)
rdaddsc(&o->main, "<<\n");
#ifdef PDF_NOCOMPRESS
zlen = o->stream.pos;
zbuf = snewn(zlen, char);
memcpy(zbuf, o->stream.text, zlen);
sprintf(text, "/Length %d\n>>\n", zlen);
#else
zcontext = deflate_compress_new(DEFLATE_TYPE_ZLIB);
deflate_compress_data(zcontext, o->stream.text, o->stream.pos,
DEFLATE_END_OF_DATA, &zbuf, &zlen);
deflate_compress_free(zcontext);
sprintf(text, "/Filter/FlateDecode\n/Length %d\n>>\n", zlen);
#endif
rdaddsc(&o->main, text);
}
assert(o->main.text);
rdaddsc(&rs, o->main.text);
sfree(o->main.text);
if (rs.text[rs.pos-1] != '\n')
rdaddc(&rs, '\n');
if (o->stream.text) {
rdaddsc(&rs, "stream\n");
rdaddsn(&rs, zbuf, zlen);
rdaddsc(&rs, "\nendstream\n");
sfree(o->stream.text);
sfree(zbuf);
}
rdaddsc(&rs, "endobj\n");
o->final = rs.text;
o->size = rs.pos;
}
/*
* Write out the PDF file.
*/
if (!strcmp(filename, "-"))
fp = stdout;
else
fp = fopen(filename, "wb");
if (!fp) {
err_cantopenw(es, filename);
return;
}
/*
* Header. I'm going to put the version IDs in the header as
* well, simply in PDF comments. The PDF Reference also suggests
* that binary PDF files contain four top-bit-set characters in
* the second line.
*/
fileoff = fprintf(fp, "%%PDF-1.3\n%% L\xc3\xba\xc3\xb0""a\n");
for (p = sourceform; p; p = p->next)
if (p->type == para_VersionID)
fileoff += pdf_versionid(fp, p->words);
/*
* Body
*/
for (o = olist.head; o; o = o->next) {
o->fileoff = fileoff;
fwrite(o->final, 1, o->size, fp);
fileoff += o->size;
}
/*
* Cross-reference table
*/
fprintf(fp, "xref\n");
assert(olist.head->number == 1);
fprintf(fp, "0 %d\n", olist.tail->number + 1);
fprintf(fp, "0000000000 65535 f \n");
for (o = olist.head; o; o = o->next) {
char entry[40];
sprintf(entry, "%010d 00000 n \n", o->fileoff);
assert(strlen(entry) == 20);
fputs(entry, fp);
}
/*
* Trailer
*/
fprintf(fp, "trailer\n<<\n/Size %d\n/Root %d 0 R\n/Info %d 0 R\n>>\n",
olist.tail->number + 1, cat->number, info->number);
fprintf(fp, "startxref\n%d\n%%%%EOF\n", fileoff);
if (fp != stdout)
fclose(fp);
sfree(filename);
}
object *new_object(objlist *list)
{
object *obj = snew(object);
obj->list = list;
obj->main.text = NULL;
obj->main.pos = obj->main.size = 0;
obj->stream.text = NULL;
obj->stream.pos = obj->stream.size = 0;
obj->number = list->number++;
obj->next = NULL;
if (list->tail)
list->tail->next = obj;
else
list->head = obj;
list->tail = obj;
obj->size = 0;
obj->final = NULL;
return obj;
}
void objtext(object *o, char const *text)
{
rdaddsc(&o->main, text);
}
void objstream_len(object *o, char const *text, size_t len)
{
rdaddsn(&o->stream, text, len);
}
void objstream(object *o, char const *text)
{
rdaddsc(&o->stream, text);
}
static void objref(object *o, object *dest)
{
char buf[40];
sprintf(buf, "%d 0 R", dest->number);
rdaddsc(&o->main, buf);
}
static void objdest(object *o, page_data *p) {
objtext(o, "[");
objref(o, (object *)p->spare);
objtext(o, "/XYZ null null null]");
}
static char const * const stdfonts[] = {
"Times-Roman", "Times-Bold", "Times-Italic", "Times-BoldItalic",
"Helvetica", "Helvetica-Bold", "Helvetica-Oblique","Helvetica-BoldOblique",
"Courier", "Courier-Bold", "Courier-Oblique", "Courier-BoldOblique",
"Symbol", "ZapfDingbats"
};
static bool is_std_font(char const *name) {
unsigned i;
for (i = 0; i < lenof(stdfonts); i++)
if (strcmp(name, stdfonts[i]) == 0)
return true;
return false;
}
static void make_pages_node(object *node, object *parent, page_data *first,
page_data *last, object *resources,
object *mediabox)
{
int count;
page_data *page;
char buf[80];
objtext(node, "<<\n/Type /Pages\n");
if (parent) {
objtext(node, "/Parent ");
objref(node, parent);
objtext(node, "\n");
}
/*
* Count the pages in this stretch, to see if there are few
* enough to reference directly.
*/
count = 0;
for (page = first; page; page = page->next) {
count++;
if (page == last)
break;
}
sprintf(buf, "/Count %d\n/Kids [\n", count);
objtext(node, buf);
if (count > TREE_BRANCH) {
int i;
page_data *thisfirst, *thislast;
page = first;
for (i = 0; i < TREE_BRANCH; i++) {
int number = (i+1) * count / TREE_BRANCH - i * count / TREE_BRANCH;
thisfirst = page;
thislast = NULL;
while (number--) {
thislast = page;
page = page->next;
}
assert(thislast);
if (thisfirst == thislast) {
objref(node, (object *)thisfirst->spare);
objtext((object *)thisfirst->spare, "/Parent ");
objref((object *)thisfirst->spare, node);
objtext((object *)thisfirst->spare, "\n");
} else {
object *newnode = new_object(node->list);
make_pages_node(newnode, node, thisfirst, thislast,
NULL, NULL);
objref(node, newnode);
}
objtext(node, "\n");
}
assert(thislast == last || page == NULL);
} else {
for (page = first; page; page = page->next) {
objref(node, (object *)page->spare);
objtext(node, "\n");
objtext((object *)page->spare, "/Parent ");
objref((object *)page->spare, node);
objtext((object *)page->spare, "\n");
if (page == last)
break;
}
}
objtext(node, "]\n");
if (resources) {
objtext(node, "/Resources ");
objref(node, resources);
objtext(node, "\n");
}
if (mediabox) {
objtext(node, "/MediaBox ");
objref(node, mediabox);
objtext(node, "\n");
}
objtext(node, ">>\n");
}
/*
* In text on the page, PDF uses the PostScript font model, which
* means that glyphs are identified by PS strings and hence font
* encoding can be managed independently of the supplied encoding
* of the font. However, in the document outline, the PDF spec
* encodes in either PDFDocEncoding (a custom superset of
* ISO-8859-1) or UTF-16BE.
*/
char *pdf_outline_convert(wchar_t *s, int *len) {
char *ret;
ret = utoa_careful_dup(s, CS_PDF);
/*
* Very silly special case: if the returned string begins with
* FE FF, then the PDF reader will mistake it for a UTF-16BE
* string. So in this case we give up on PDFDocEncoding and
* encode it in UTF-16 straight away.
*/
if (ret && ret[0] == '\xFE' && ret[1] == '\xFF') {
sfree(ret);
ret = NULL;
}
if (!ret) {
ret = utoa_dup_len(s, CS_UTF16BE, len);
} else {
*len = strlen(ret);
}
return ret;
}
static int make_outline(object *parent, outline_element *items, int n,
bool open)
{
int level, totalcount = 0;
outline_element *itemp;
object *curr, *prev = NULL, *first = NULL, *last = NULL;
assert(n > 0);
level = items->level;
while (n > 0) {
char *title;
int titlelen;
/*
* Here we expect to be sitting on an item at the given
* level. So we start by constructing an outline entry for
* that item.
*/
assert(items->level == level);
title = pdf_outline_convert(items->pdata->outline_title, &titlelen);
totalcount++;
curr = new_object(parent->list);
if (!first) first = curr;
last = curr;
objtext(curr, "<<\n/Title ");
pdf_string_len(objtext, curr, title, titlelen);
sfree(title);
objtext(curr, "\n/Parent ");
objref(curr, parent);
objtext(curr, "\n/Dest");
objdest(curr, items->pdata->first->page);
objtext(curr, "\n");
if (prev) {
objtext(curr, "/Prev ");
objref(curr, prev);
objtext(curr, "\n");
objtext(prev, "/Next ");
objref(prev, curr);
objtext(prev, "\n>>\n");
}
prev = curr;
items++, n--;
for (itemp = items; itemp < items+n && itemp->level > level;
itemp++);
if (itemp > items) {
char buf[80];
int count = make_outline(curr, items, itemp - items, false);
if (!open)
count = -count;
else
totalcount += count;
sprintf(buf, "/Count %d\n", count);
objtext(curr, buf);
}
n -= itemp - items;
items = itemp;
}
objtext(prev, ">>\n");
assert(first && last);
objtext(parent, "/First ");
objref(parent, first);
objtext(parent, "\n/Last ");
objref(parent, last);
objtext(parent, "\n");
return totalcount;
}
static int pdf_versionid(FILE *fp, word *words)
{
int ret;
ret = fprintf(fp, "%% ");