lib/3rdparty/freetype/src/sfnt/ttpost.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ttpost.c                                                               */
   4 /*                                                                         */
   5 /*    Postcript name table processing for TrueType and OpenType fonts      */
   6 /*    (body).                                                              */
   7 /*                                                                         */
   8 /*  Copyright 1996-2001, 2002, 2003, 2006, 2007 by                         */
   9 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  10 /*                                                                         */
  11 /*  This file is part of the FreeType project, and may only be used,       */
  12 /*  modified, and distributed under the terms of the FreeType project      */
  13 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  14 /*  this file you indicate that you have read the license and              */
  15 /*  understand and accept it fully.                                        */
  16 /*                                                                         */
  17 /***************************************************************************/
  18
  19   /*************************************************************************/
  20   /*                                                                       */
  21   /* The post table is not completely loaded by the core engine.  This     */
  22   /* file loads the missing PS glyph names and implements an API to access */
  23   /* them.                                                                 */
  24   /*                                                                       */
  25   /*************************************************************************/
  26
  27
  28 #include <ft2build.h>
  29 #include FT_INTERNAL_STREAM_H
  30 #include FT_TRUETYPE_TAGS_H
  31 #include "ttpost.h"
  32 #include "ttload.h"
  33
  34 #include "sferrors.h"
  35
  36
  37   /*************************************************************************/
  38   /*                                                                       */
  39   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  40   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  41   /* messages during execution.                                            */
  42   /*                                                                       */
  43 #undef  FT_COMPONENT
  44 #define FT_COMPONENT  trace_ttpost
  45
  46
  47   /* If this configuration macro is defined, we rely on the `PSNames' */
  48   /* module to grab the glyph names.                                  */
  49
  50 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
  51
  52
  53 #include FT_SERVICE_POSTSCRIPT_CMAPS_H
  54
  55 #define MAC_NAME( x )  ( (FT_String*)psnames->macintosh_name( x ) )
  56
  57
  58 #else /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
  59
  60
  61    /* Otherwise, we ignore the `PSNames' module, and provide our own  */
  62    /* table of Mac names.  Thus, it is possible to build a version of */
  63    /* FreeType without the Type 1 driver & PSNames module.            */
  64
  65 #define MAC_NAME( x )  tt_post_default_names[x]
  66
  67   /* the 258 default Mac PS glyph names */
  68
  69   static const FT_String*  tt_post_default_names[258] =
  70   {
  71     /*   0 */
  72     ".notdef", ".null", "CR", "space", "exclam",
  73     "quotedbl", "numbersign", "dollar", "percent", "ampersand",
  74     /*  10 */
  75     "quotesingle", "parenleft", "parenright", "asterisk", "plus",
  76     "comma", "hyphen", "period", "slash", "zero",
  77     /*  20 */
  78     "one", "two", "three", "four", "five",
  79     "six", "seven", "eight", "nine", "colon",
  80     /*  30 */
  81     "semicolon", "less", "equal", "greater", "question",
  82     "at", "A", "B", "C", "D",
  83     /*  40 */
  84     "E", "F", "G", "H", "I",
  85     "J", "K", "L", "M", "N",
  86     /*  50 */
  87     "O", "P", "Q", "R", "S",
  88     "T", "U", "V", "W", "X",
  89     /*  60 */
  90     "Y", "Z", "bracketleft", "backslash", "bracketright",
  91     "asciicircum", "underscore", "grave", "a", "b",
  92     /*  70 */
  93     "c", "d", "e", "f", "g",
  94     "h", "i", "j", "k", "l",
  95     /*  80 */
  96     "m", "n", "o", "p", "q",
  97     "r", "s", "t", "u", "v",
  98     /*  90 */
  99     "w", "x", "y", "z", "braceleft",
 100     "bar", "braceright", "asciitilde", "Adieresis", "Aring",
 101     /* 100 */
 102     "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
 103     "aacute", "agrave", "acircumflex", "adieresis", "atilde",
 104     /* 110 */
 105     "aring", "ccedilla", "eacute", "egrave", "ecircumflex",
 106     "edieresis", "iacute", "igrave", "icircumflex", "idieresis",
 107     /* 120 */
 108     "ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
 109     "otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
 110     /* 130 */
 111     "dagger", "degree", "cent", "sterling", "section",
 112     "bullet", "paragraph", "germandbls", "registered", "copyright",
 113     /* 140 */
 114     "trademark", "acute", "dieresis", "notequal", "AE",
 115     "Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
 116     /* 150 */
 117     "yen", "mu", "partialdiff", "summation", "product",
 118     "pi", "integral", "ordfeminine", "ordmasculine", "Omega",
 119     /* 160 */
 120     "ae", "oslash", "questiondown", "exclamdown", "logicalnot",
 121     "radical", "florin", "approxequal", "Delta", "guillemotleft",
 122     /* 170 */
 123     "guillemotright", "ellipsis", "nbspace", "Agrave", "Atilde",
 124     "Otilde", "OE", "oe", "endash", "emdash",
 125     /* 180 */
 126     "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
 127     "lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
 128     /* 190 */
 129     "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
 130     "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
 131     /* 200 */
 132     "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
 133     "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
 134     /* 210 */
 135     "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
 136     "dotlessi", "circumflex", "tilde", "macron", "breve",
 137     /* 220 */
 138     "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
 139     "caron", "Lslash", "lslash", "Scaron", "scaron",
 140     /* 230 */
 141     "Zcaron", "zcaron", "brokenbar", "Eth", "eth",
 142     "Yacute", "yacute", "Thorn", "thorn", "minus",
 143     /* 240 */
 144     "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
 145     "onequarter", "threequarters", "franc", "Gbreve", "gbreve",
 146     /* 250 */
 147     "Idot", "Scedilla", "scedilla", "Cacute", "cacute",
 148     "Ccaron", "ccaron", "dmacron",
 149   };
 150
 151
 152 #endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
 153
 154
 155   static FT_Error
 156   load_format_20( TT_Face    face,
 157                   FT_Stream  stream )
 158   {
 159     FT_Memory   memory = stream->memory;
 160     FT_Error    error;
 161
 162     FT_Int      num_glyphs;
 163     FT_UShort   num_names;
 164
 165     FT_UShort*  glyph_indices = 0;
 166     FT_Char**   name_strings  = 0;
 167
 168
 169     if ( FT_READ_USHORT( num_glyphs ) )
 170       goto Exit;
 171
 172     /* UNDOCUMENTED!  The number of glyphs in this table can be smaller */
 173     /* than the value in the maxp table (cf. cyberbit.ttf).             */
 174
 175     /* There already exist fonts which have more than 32768 glyph names */
 176     /* in this table, so the test for this threshold has been dropped.  */
 177
 178     if ( num_glyphs > face->max_profile.numGlyphs )
 179     {
 180       error = SFNT_Err_Invalid_File_Format;
 181       goto Exit;
 182     }
 183
 184     /* load the indices */
 185     {
 186       FT_Int  n;
 187
 188
 189       if ( FT_NEW_ARRAY ( glyph_indices, num_glyphs ) ||
 190            FT_FRAME_ENTER( num_glyphs * 2L )          )
 191         goto Fail;
 192
 193       for ( n = 0; n < num_glyphs; n++ )
 194         glyph_indices[n] = FT_GET_USHORT();
 195
 196       FT_FRAME_EXIT();
 197     }
 198
 199     /* compute number of names stored in table */
 200     {
 201       FT_Int  n;
 202
 203
 204       num_names = 0;
 205
 206       for ( n = 0; n < num_glyphs; n++ )
 207       {
 208         FT_Int  idx;
 209
 210
 211         idx = glyph_indices[n];
 212         if ( idx >= 258 )
 213         {
 214           idx -= 257;
 215           if ( idx > num_names )
 216             num_names = (FT_UShort)idx;
 217         }
 218       }
 219     }
 220
 221     /* now load the name strings */
 222     {
 223       FT_UShort  n;
 224
 225
 226       if ( FT_NEW_ARRAY( name_strings, num_names ) )
 227         goto Fail;
 228
 229       for ( n = 0; n < num_names; n++ )
 230       {
 231         FT_UInt  len;
 232
 233
 234         if ( FT_READ_BYTE  ( len )                    ||
 235              FT_NEW_ARRAY( name_strings[n], len + 1 ) ||
 236              FT_STREAM_READ  ( name_strings[n], len ) )
 237           goto Fail1;
 238
 239         name_strings[n][len] = '\0';
 240       }
 241     }
 242
 243     /* all right, set table fields and exit successfully */
 244     {
 245       TT_Post_20  table = &face->postscript_names.names.format_20;
 246
 247
 248       table->num_glyphs    = (FT_UShort)num_glyphs;
 249       table->num_names     = (FT_UShort)num_names;
 250       table->glyph_indices = glyph_indices;
 251       table->glyph_names   = name_strings;
 252     }
 253     return SFNT_Err_Ok;
 254
 255   Fail1:
 256     {
 257       FT_UShort  n;
 258
 259
 260       for ( n = 0; n < num_names; n++ )
 261         FT_FREE( name_strings[n] );
 262     }
 263
 264   Fail:
 265     FT_FREE( name_strings );
 266     FT_FREE( glyph_indices );
 267
 268   Exit:
 269     return error;
 270   }
 271
 272
 273   static FT_Error
 274   load_format_25( TT_Face    face,
 275                   FT_Stream  stream )
 276   {
 277     FT_Memory  memory = stream->memory;
 278     FT_Error   error;
 279
 280     FT_Int     num_glyphs;
 281     FT_Char*   offset_table = 0;
 282
 283
 284     /* UNDOCUMENTED!  This value appears only in the Apple TT specs. */
 285     if ( FT_READ_USHORT( num_glyphs ) )
 286       goto Exit;
 287
 288     /* check the number of glyphs */
 289     if ( num_glyphs > face->max_profile.numGlyphs || num_glyphs > 258 )
 290     {
 291       error = SFNT_Err_Invalid_File_Format;
 292       goto Exit;
 293     }
 294
 295     if ( FT_NEW_ARRAY( offset_table, num_glyphs )   ||
 296          FT_STREAM_READ( offset_table, num_glyphs ) )
 297       goto Fail;
 298
 299     /* now check the offset table */
 300     {
 301       FT_Int  n;
 302
 303
 304       for ( n = 0; n < num_glyphs; n++ )
 305       {
 306         FT_Long  idx = (FT_Long)n + offset_table[n];
 307
 308
 309         if ( idx < 0 || idx > num_glyphs )
 310         {
 311           error = SFNT_Err_Invalid_File_Format;
 312           goto Fail;
 313         }
 314       }
 315     }
 316
 317     /* OK, set table fields and exit successfully */
 318     {
 319       TT_Post_25  table = &face->postscript_names.names.format_25;
 320
 321
 322       table->num_glyphs = (FT_UShort)num_glyphs;
 323       table->offsets    = offset_table;
 324     }
 325
 326     return SFNT_Err_Ok;
 327
 328   Fail:
 329     FT_FREE( offset_table );
 330
 331   Exit:
 332     return error;
 333   }
 334
 335
 336   static FT_Error
 337   load_post_names( TT_Face  face )
 338   {
 339     FT_Stream  stream;
 340     FT_Error   error;
 341     FT_Fixed   format;
 342
 343
 344     /* get a stream for the face's resource */
 345     stream = face->root.stream;
 346
 347     /* seek to the beginning of the PS names table */
 348     error = face->goto_table( face, TTAG_post, stream, 0 );
 349     if ( error )
 350       goto Exit;
 351
 352     format = face->postscript.FormatType;
 353
 354     /* go to beginning of subtable */
 355     if ( FT_STREAM_SKIP( 32 ) )
 356       goto Exit;
 357
 358     /* now read postscript table */
 359     if ( format == 0x00020000L )
 360       error = load_format_20( face, stream );
 361     else if ( format == 0x00028000L )
 362       error = load_format_25( face, stream );
 363     else
 364       error = SFNT_Err_Invalid_File_Format;
 365
 366     face->postscript_names.loaded = 1;
 367
 368   Exit:
 369     return error;
 370   }
 371
 372
 373   FT_LOCAL_DEF( void )
 374   tt_face_free_ps_names( TT_Face  face )
 375   {
 376     FT_Memory      memory = face->root.memory;
 377     TT_Post_Names  names  = &face->postscript_names;
 378     FT_Fixed       format;
 379
 380
 381     if ( names->loaded )
 382     {
 383       format = face->postscript.FormatType;
 384
 385       if ( format == 0x00020000L )
 386       {
 387         TT_Post_20  table = &names->names.format_20;
 388         FT_UShort   n;
 389
 390
 391         FT_FREE( table->glyph_indices );
 392         table->num_glyphs = 0;
 393
 394         for ( n = 0; n < table->num_names; n++ )
 395           FT_FREE( table->glyph_names[n] );
 396
 397         FT_FREE( table->glyph_names );
 398         table->num_names = 0;
 399       }
 400       else if ( format == 0x00028000L )
 401       {
 402         TT_Post_25  table = &names->names.format_25;
 403
 404
 405         FT_FREE( table->offsets );
 406         table->num_glyphs = 0;
 407       }
 408     }
 409     names->loaded = 0;
 410   }
 411
 412
 413   /*************************************************************************/
 414   /*                                                                       */
 415   /* <Function>                                                            */
 416   /*    tt_face_get_ps_name                                                */
 417   /*                                                                       */
 418   /* <Description>                                                         */
 419   /*    Gets the PostScript glyph name of a glyph.                         */
 420   /*                                                                       */
 421   /* <Input>                                                               */
 422   /*    face   :: A handle to the parent face.                             */
 423   /*                                                                       */
 424   /*    idx    :: The glyph index.                                         */
 425   /*                                                                       */
 426   /*    PSname :: The address of a string pointer.  Will be NULL in case   */
 427   /*              of error, otherwise it is a pointer to the glyph name.   */
 428   /*                                                                       */
 429   /*              You must not modify the returned string!                 */
 430   /*                                                                       */
 431   /* <Output>                                                              */
 432   /*    FreeType error code.  0 means success.                             */
 433   /*                                                                       */
 434   FT_LOCAL_DEF( FT_Error )
 435   tt_face_get_ps_name( TT_Face      face,
 436                        FT_UInt      idx,
 437                        FT_String**  PSname )
 438   {
 439     FT_Error         error;
 440     TT_Post_Names    names;
 441     FT_Fixed         format;
 442
 443 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
 444     FT_Service_PsCMaps  psnames;
 445 #endif
 446
 447
 448     if ( !face )
 449       return SFNT_Err_Invalid_Face_Handle;
 450
 451     if ( idx >= (FT_UInt)face->max_profile.numGlyphs )
 452       return SFNT_Err_Invalid_Glyph_Index;
 453
 454 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
 455     psnames = (FT_Service_PsCMaps)face->psnames;
 456     if ( !psnames )
 457       return SFNT_Err_Unimplemented_Feature;
 458 #endif
 459
 460     names = &face->postscript_names;
 461
 462     /* `.notdef' by default */
 463     *PSname = MAC_NAME( 0 );
 464
 465     format = face->postscript.FormatType;
 466
 467     if ( format == 0x00010000L )
 468     {
 469       if ( idx < 258 )                    /* paranoid checking */
 470         *PSname = MAC_NAME( idx );
 471     }
 472     else if ( format == 0x00020000L )
 473     {
 474       TT_Post_20  table = &names->names.format_20;
 475
 476
 477       if ( !names->loaded )
 478       {
 479         error = load_post_names( face );
 480         if ( error )
 481           goto End;
 482       }
 483
 484       if ( idx < (FT_UInt)table->num_glyphs )
 485       {
 486         FT_UShort  name_index = table->glyph_indices[idx];
 487
 488
 489         if ( name_index < 258 )
 490           *PSname = MAC_NAME( name_index );
 491         else
 492           *PSname = (FT_String*)table->glyph_names[name_index - 258];
 493       }
 494     }
 495     else if ( format == 0x00028000L )
 496     {
 497       TT_Post_25  table = &names->names.format_25;
 498
 499
 500       if ( !names->loaded )
 501       {
 502         error = load_post_names( face );
 503         if ( error )
 504           goto End;
 505       }
 506
 507       if ( idx < (FT_UInt)table->num_glyphs )    /* paranoid checking */
 508       {
 509         idx    += table->offsets[idx];
 510         *PSname = MAC_NAME( idx );
 511       }
 512     }
 513
 514     /* nothing to do for format == 0x00030000L */
 515
 516   End:
 517     return SFNT_Err_Ok;
 518   }
 519
 520
 521 /* END */