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#include "mupdf/pdf.h"
static pdf_obj *
pdf_lookup_name_imp(fz_context *ctx, pdf_obj *node, pdf_obj *needle)
{
pdf_obj *kids = pdf_dict_get(ctx, node, PDF_NAME_Kids);
pdf_obj *names = pdf_dict_get(ctx, node, PDF_NAME_Names);
if (pdf_is_array(ctx, kids))
{
int l = 0;
int r = pdf_array_len(ctx, kids) - 1;
while (l <= r)
{
int m = (l + r) >> 1;
pdf_obj *kid = pdf_array_get(ctx, kids, m);
pdf_obj *limits = pdf_dict_get(ctx, kid, PDF_NAME_Limits);
pdf_obj *first = pdf_array_get(ctx, limits, 0);
pdf_obj *last = pdf_array_get(ctx, limits, 1);
if (pdf_objcmp(ctx, needle, first) < 0)
r = m - 1;
else if (pdf_objcmp(ctx, needle, last) > 0)
l = m + 1;
else
{
pdf_obj *obj;
if (pdf_mark_obj(ctx, node))
break;
fz_try(ctx)
obj = pdf_lookup_name_imp(ctx, kid, needle);
fz_always(ctx)
pdf_unmark_obj(ctx, node);
fz_catch(ctx)
fz_rethrow(ctx);
return obj;
}
}
}
if (pdf_is_array(ctx, names))
{
int l = 0;
int r = (pdf_array_len(ctx, names) / 2) - 1;
while (l <= r)
{
int m = (l + r) >> 1;
int c;
pdf_obj *key = pdf_array_get(ctx, names, m * 2);
pdf_obj *val = pdf_array_get(ctx, names, m * 2 + 1);
c = pdf_objcmp(ctx, needle, key);
if (c < 0)
r = m - 1;
else if (c > 0)
l = m + 1;
else
return val;
}
/* Spec says names should be sorted (hence the binary search,
* above), but Acrobat copes with non-sorted. Drop back to a
* simple search if the binary search fails. */
r = pdf_array_len(ctx, names)/2;
for (l = 0; l < r; l++)
if (!pdf_objcmp(ctx, needle, pdf_array_get(ctx, names, l * 2)))
return pdf_array_get(ctx, names, l * 2 + 1);
}
return NULL;
}
pdf_obj *
pdf_lookup_name(fz_context *ctx, pdf_document *doc, pdf_obj *which, pdf_obj *needle)
{
pdf_obj *root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
pdf_obj *names = pdf_dict_get(ctx, root, PDF_NAME_Names);
pdf_obj *tree = pdf_dict_get(ctx, names, which);
return pdf_lookup_name_imp(ctx, tree, needle);
}
pdf_obj *
pdf_lookup_dest(fz_context *ctx, pdf_document *doc, pdf_obj *needle)
{
pdf_obj *root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
pdf_obj *dests = pdf_dict_get(ctx, root, PDF_NAME_Dests);
pdf_obj *names = pdf_dict_get(ctx, root, PDF_NAME_Names);
pdf_obj *dest = NULL;
/* PDF 1.1 has destinations in a dictionary */
if (dests)
{
if (pdf_is_name(ctx, needle))
return pdf_dict_get(ctx, dests, needle);
else
return pdf_dict_gets(ctx, dests, pdf_to_str_buf(ctx, needle));
}
/* PDF 1.2 has destinations in a name tree */
if (names && !dest)
{
pdf_obj *tree = pdf_dict_get(ctx, names, PDF_NAME_Dests);
return pdf_lookup_name_imp(ctx, tree, needle);
}
return NULL;
}
static void
pdf_load_name_tree_imp(fz_context *ctx, pdf_obj *dict, pdf_document *doc, pdf_obj *node)
{
pdf_obj *kids = pdf_dict_get(ctx, node, PDF_NAME_Kids);
pdf_obj *names = pdf_dict_get(ctx, node, PDF_NAME_Names);
int i;
if (kids && !pdf_mark_obj(ctx, node))
{
fz_try(ctx)
{
int len = pdf_array_len(ctx, kids);
for (i = 0; i < len; i++)
pdf_load_name_tree_imp(ctx, dict, doc, pdf_array_get(ctx, kids, i));
}
fz_always(ctx)
pdf_unmark_obj(ctx, node);
fz_catch(ctx)
fz_rethrow(ctx);
}
if (names)
{
int len = pdf_array_len(ctx, names);
for (i = 0; i + 1 < len; i += 2)
{
pdf_obj *key = pdf_array_get(ctx, names, i);
pdf_obj *val = pdf_array_get(ctx, names, i + 1);
if (pdf_is_string(ctx, key))
{
key = pdf_to_utf8_name(ctx, doc, key);
pdf_dict_put(ctx, dict, key, val);
pdf_drop_obj(ctx, key);
}
else if (pdf_is_name(ctx, key))
{
pdf_dict_put(ctx, dict, key, val);
}
}
}
}
pdf_obj *
pdf_load_name_tree(fz_context *ctx, pdf_document *doc, pdf_obj *which)
{
pdf_obj *root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
pdf_obj *names = pdf_dict_get(ctx, root, PDF_NAME_Names);
pdf_obj *tree = pdf_dict_get(ctx, names, which);
if (pdf_is_dict(ctx, tree))
{
pdf_obj *dict = pdf_new_dict(ctx, doc, 100);
pdf_load_name_tree_imp(ctx, dict, doc, tree);
return dict;
}
return NULL;
}
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