132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
#include "mupdf/fitz.h"
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#include "mupdf/pdf.h"
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#include <string.h>
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/* Load or synthesize ToUnicode map for fonts */
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static void
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pdf_remap_cmap_range(fz_context *ctx, pdf_cmap *ucs_from_gid,
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unsigned int cpt, unsigned int gid, unsigned int n, pdf_cmap *ucs_from_cpt)
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{
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unsigned int k;
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int ucsbuf[8];
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int ucslen;
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for (k = 0; k <= n; ++k)
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{
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ucslen = pdf_lookup_cmap_full(ucs_from_cpt, cpt + k, ucsbuf);
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if (ucslen == 1)
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pdf_map_range_to_range(ctx, ucs_from_gid, gid + k, gid + k, ucsbuf[0]);
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else if (ucslen > 1)
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pdf_map_one_to_many(ctx, ucs_from_gid, gid + k, ucsbuf, ucslen);
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}
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}
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static pdf_cmap *
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pdf_remap_cmap(fz_context *ctx, pdf_cmap *gid_from_cpt, pdf_cmap *ucs_from_cpt)
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{
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pdf_cmap *ucs_from_gid;
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unsigned int a, b, x;
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int i;
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ucs_from_gid = pdf_new_cmap(ctx);
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fz_try(ctx)
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{
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if (gid_from_cpt->usecmap)
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ucs_from_gid->usecmap = pdf_remap_cmap(ctx, gid_from_cpt->usecmap, ucs_from_cpt);
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for (i = 0; i < gid_from_cpt->codespace_len; i++)
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{
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pdf_add_codespace(ctx, ucs_from_gid,
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gid_from_cpt->codespace[i].low,
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gid_from_cpt->codespace[i].high,
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gid_from_cpt->codespace[i].n);
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}
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for (i = 0; i < gid_from_cpt->rlen; ++i)
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{
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a = gid_from_cpt->ranges[i].low;
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b = gid_from_cpt->ranges[i].high;
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x = gid_from_cpt->ranges[i].out;
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pdf_remap_cmap_range(ctx, ucs_from_gid, a, x, b - a, ucs_from_cpt);
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}
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for (i = 0; i < gid_from_cpt->xlen; ++i)
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{
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a = gid_from_cpt->xranges[i].low;
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b = gid_from_cpt->xranges[i].high;
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x = gid_from_cpt->xranges[i].out;
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pdf_remap_cmap_range(ctx, ucs_from_gid, a, x, b - a, ucs_from_cpt);
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}
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/* Font encoding CMaps don't have one-to-many mappings, so we can ignore the mranges. */
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pdf_sort_cmap(ctx, ucs_from_gid);
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}
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fz_catch(ctx)
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{
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pdf_drop_cmap(ctx, ucs_from_gid);
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fz_rethrow(ctx);
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}
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return ucs_from_gid;
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}
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void
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pdf_load_to_unicode(fz_context *ctx, pdf_document *doc, pdf_font_desc *font,
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const char **strings, char *collection, pdf_obj *cmapstm)
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{
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unsigned int cpt;
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if (pdf_is_stream(ctx, cmapstm))
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{
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pdf_cmap *ucs_from_cpt = pdf_load_embedded_cmap(ctx, doc, cmapstm);
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fz_try(ctx)
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font->to_unicode = pdf_remap_cmap(ctx, font->encoding, ucs_from_cpt);
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fz_always(ctx)
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pdf_drop_cmap(ctx, ucs_from_cpt);
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fz_catch(ctx)
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fz_rethrow(ctx);
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font->size += pdf_cmap_size(ctx, font->to_unicode);
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}
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else if (collection)
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{
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if (!strcmp(collection, "Adobe-CNS1"))
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font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-CNS1-UCS2");
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else if (!strcmp(collection, "Adobe-GB1"))
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font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-GB1-UCS2");
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else if (!strcmp(collection, "Adobe-Japan1"))
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font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-Japan1-UCS2");
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else if (!strcmp(collection, "Adobe-Korea1"))
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font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-Korea1-UCS2");
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return;
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}
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if (strings)
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{
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/* TODO one-to-many mappings */
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font->cid_to_ucs = fz_malloc_array(ctx, 256, unsigned short);
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font->cid_to_ucs_len = 256;
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font->size += 256 * sizeof *font->cid_to_ucs;
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for (cpt = 0; cpt < 256; cpt++)
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{
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if (strings[cpt])
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font->cid_to_ucs[cpt] = fz_unicode_from_glyph_name(strings[cpt]);
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else
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font->cid_to_ucs[cpt] = FZ_REPLACEMENT_CHARACTER;
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}
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}
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if (!font->to_unicode && !font->cid_to_ucs)
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{
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/* TODO: synthesize a ToUnicode if it's a freetype font with
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* cmap and/or post tables or if it has glyph names. */
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}
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}
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