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  1. #include "fitz.h"
  2. #include "mupdf.h"
  3.  
  4. /*
  5.  * Load CMap stream in PDF file
  6.  */
  7. fz_error
  8. pdf_load_embedded_cmap(pdf_cmap **cmapp, pdf_xref *xref, fz_obj *stmobj)
  9. {
  10.         fz_error error = fz_okay;
  11.         fz_stream *file = NULL;
  12.         pdf_cmap *cmap = NULL;
  13.         pdf_cmap *usecmap;
  14.         fz_obj *wmode;
  15.         fz_obj *obj;
  16.  
  17.         if ((*cmapp = pdf_find_item(xref->store, pdf_drop_cmap, stmobj)))
  18.         {
  19.                 pdf_keep_cmap(*cmapp);
  20.                 return fz_okay;
  21.         }
  22.  
  23.         error = pdf_open_stream(&file, xref, fz_to_num(stmobj), fz_to_gen(stmobj));
  24.         if (error)
  25.         {
  26.                 error = fz_rethrow(error, "cannot open cmap stream (%d %d R)", fz_to_num(stmobj), fz_to_gen(stmobj));
  27.                 goto cleanup;
  28.         }
  29.  
  30.         error = pdf_parse_cmap(&cmap, file);
  31.         if (error)
  32.         {
  33.                 error = fz_rethrow(error, "cannot parse cmap stream (%d %d R)", fz_to_num(stmobj), fz_to_gen(stmobj));
  34.                 goto cleanup;
  35.         }
  36.  
  37.         fz_close(file);
  38.  
  39.         wmode = fz_dict_gets(stmobj, "WMode");
  40.         if (fz_is_int(wmode))
  41.                 pdf_set_wmode(cmap, fz_to_int(wmode));
  42.  
  43.         obj = fz_dict_gets(stmobj, "UseCMap");
  44.         if (fz_is_name(obj))
  45.         {
  46.                 error = pdf_load_system_cmap(&usecmap, fz_to_name(obj));
  47.                 if (error)
  48.                 {
  49.                         error = fz_rethrow(error, "cannot load system usecmap '%s'", fz_to_name(obj));
  50.                         goto cleanup;
  51.                 }
  52.                 pdf_set_usecmap(cmap, usecmap);
  53.                 pdf_drop_cmap(usecmap);
  54.         }
  55.         else if (fz_is_indirect(obj))
  56.         {
  57.                 error = pdf_load_embedded_cmap(&usecmap, xref, obj);
  58.                 if (error)
  59.                 {
  60.                         error = fz_rethrow(error, "cannot load embedded usecmap (%d %d R)", fz_to_num(obj), fz_to_gen(obj));
  61.                         goto cleanup;
  62.                 }
  63.                 pdf_set_usecmap(cmap, usecmap);
  64.                 pdf_drop_cmap(usecmap);
  65.         }
  66.  
  67.         pdf_store_item(xref->store, pdf_keep_cmap, pdf_drop_cmap, stmobj, cmap);
  68.  
  69.         *cmapp = cmap;
  70.         return fz_okay;
  71.  
  72. cleanup:
  73.         if (file)
  74.                 fz_close(file);
  75.         if (cmap)
  76.                 pdf_drop_cmap(cmap);
  77.         return error; /* already rethrown */
  78. }
  79.  
  80. /*
  81.  * Create an Identity-* CMap (for both 1 and 2-byte encodings)
  82.  */
  83. pdf_cmap *
  84. pdf_new_identity_cmap(int wmode, int bytes)
  85. {
  86.         pdf_cmap *cmap = pdf_new_cmap();
  87.         sprintf(cmap->cmap_name, "Identity-%c", wmode ? 'V' : 'H');
  88.         pdf_add_codespace(cmap, 0x0000, 0xffff, bytes);
  89.         pdf_map_range_to_range(cmap, 0x0000, 0xffff, 0);
  90.         pdf_sort_cmap(cmap);
  91.         pdf_set_wmode(cmap, wmode);
  92.         return cmap;
  93. }
  94.  
  95. /*
  96.  * Load predefined CMap from system.
  97.  */
  98. fz_error
  99. pdf_load_system_cmap(pdf_cmap **cmapp, char *cmap_name)
  100. {
  101.         pdf_cmap *usecmap;
  102.         pdf_cmap *cmap;
  103.  
  104.         cmap = pdf_find_builtin_cmap(cmap_name);
  105.         if (!cmap)
  106.                 return fz_throw("no builtin cmap file: %s", cmap_name);
  107.  
  108.         if (cmap->usecmap_name[0] && !cmap->usecmap)
  109.         {
  110.                 usecmap = pdf_find_builtin_cmap(cmap->usecmap_name);
  111.                 if (!usecmap)
  112.                         return fz_throw("nu builtin cmap file: %s", cmap->usecmap_name);
  113.                 pdf_set_usecmap(cmap, usecmap);
  114.         }
  115.  
  116.         *cmapp = cmap;
  117.         return fz_okay;
  118. }
  119.