thirdparty/freetype-2.3.12/src/cid/cidload.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  cidload.c                                                              */
   4 /*                                                                         */
   5 /*    CID-keyed Type1 font loader (body).                                  */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2009 by             */
   8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19 #include <ft2build.h>
  20 #include FT_INTERNAL_DEBUG_H
  21 #include FT_CONFIG_CONFIG_H
  22 #include FT_MULTIPLE_MASTERS_H
  23 #include FT_INTERNAL_TYPE1_TYPES_H
  24
  25 #include "cidload.h"
  26
  27 #include "ciderrs.h"
  28
  29
  30   /*************************************************************************/
  31   /*                                                                       */
  32   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  33   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  34   /* messages during execution.                                            */
  35   /*                                                                       */
  36 #undef  FT_COMPONENT
  37 #define FT_COMPONENT  trace_cidload
  38
  39
  40   /* read a single offset */
  41   FT_LOCAL_DEF( FT_Long )
  42   cid_get_offset( FT_Byte*  *start,
  43                   FT_Byte    offsize )
  44   {
  45     FT_Long   result;
  46     FT_Byte*  p = *start;
  47
  48
  49     for ( result = 0; offsize > 0; offsize-- )
  50     {
  51       result <<= 8;
  52       result  |= *p++;
  53     }
  54
  55     *start = p;
  56     return result;
  57   }
  58
  59
  60   /*************************************************************************/
  61   /*************************************************************************/
  62   /*****                                                               *****/
  63   /*****                    TYPE 1 SYMBOL PARSING                      *****/
  64   /*****                                                               *****/
  65   /*************************************************************************/
  66   /*************************************************************************/
  67
  68
  69   static FT_Error
  70   cid_load_keyword( CID_Face        face,
  71                     CID_Loader*     loader,
  72                     const T1_Field  keyword )
  73   {
  74     FT_Error      error;
  75     CID_Parser*   parser = &loader->parser;
  76     FT_Byte*      object;
  77     void*         dummy_object;
  78     CID_FaceInfo  cid = &face->cid;
  79
  80
  81     /* if the keyword has a dedicated callback, call it */
  82     if ( keyword->type == T1_FIELD_TYPE_CALLBACK )
  83     {
  84       keyword->reader( (FT_Face)face, parser );
  85       error = parser->root.error;
  86       goto Exit;
  87     }
  88
  89     /* we must now compute the address of our target object */
  90     switch ( keyword->location )
  91     {
  92     case T1_FIELD_LOCATION_CID_INFO:
  93       object = (FT_Byte*)cid;
  94       break;
  95
  96     case T1_FIELD_LOCATION_FONT_INFO:
  97       object = (FT_Byte*)&cid->font_info;
  98       break;
  99
 100     case T1_FIELD_LOCATION_FONT_EXTRA:
 101       object = (FT_Byte*)&face->font_extra;
 102       break;
 103
 104     case T1_FIELD_LOCATION_BBOX:
 105       object = (FT_Byte*)&cid->font_bbox;
 106       break;
 107
 108     default:
 109       {
 110         CID_FaceDict  dict;
 111
 112
 113         if ( parser->num_dict < 0 )
 114         {
 115           FT_ERROR(( "cid_load_keyword: invalid use of `%s'\n",
 116                      keyword->ident ));
 117           error = CID_Err_Syntax_Error;
 118           goto Exit;
 119         }
 120
 121         dict = cid->font_dicts + parser->num_dict;
 122         switch ( keyword->location )
 123         {
 124         case T1_FIELD_LOCATION_PRIVATE:
 125           object = (FT_Byte*)&dict->private_dict;
 126           break;
 127
 128         default:
 129           object = (FT_Byte*)dict;
 130         }
 131       }
 132     }
 133
 134     dummy_object = object;
 135
 136     /* now, load the keyword data in the object's field(s) */
 137     if ( keyword->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
 138          keyword->type == T1_FIELD_TYPE_FIXED_ARRAY   )
 139       error = cid_parser_load_field_table( &loader->parser, keyword,
 140                                            &dummy_object );
 141     else
 142       error = cid_parser_load_field( &loader->parser,
 143                                      keyword, &dummy_object );
 144   Exit:
 145     return error;
 146   }
 147
 148
 149   FT_CALLBACK_DEF( FT_Error )
 150   parse_font_matrix( CID_Face     face,
 151                      CID_Parser*  parser )
 152   {
 153     FT_Matrix*    matrix;
 154     FT_Vector*    offset;
 155     CID_FaceDict  dict;
 156     FT_Face       root = (FT_Face)&face->root;
 157     FT_Fixed      temp[6];
 158     FT_Fixed      temp_scale;
 159
 160
 161     if ( parser->num_dict >= 0 )
 162     {
 163       dict   = face->cid.font_dicts + parser->num_dict;
 164       matrix = &dict->font_matrix;
 165       offset = &dict->font_offset;
 166
 167       (void)cid_parser_to_fixed_array( parser, 6, temp, 3 );
 168
 169       temp_scale = FT_ABS( temp[3] );
 170
 171       /* Set units per EM based on FontMatrix values.  We set the value to */
 172       /* `1000/temp_scale', because temp_scale was already multiplied by   */
 173       /* 1000 (in `t1_tofixed', from psobjs.c).                            */
 174       root->units_per_EM = (FT_UShort)( FT_DivFix( 0x10000L,
 175                                         FT_DivFix( temp_scale, 1000 ) ) );
 176
 177       /* we need to scale the values by 1.0/temp[3] */
 178       if ( temp_scale != 0x10000L )
 179       {
 180         temp[0] = FT_DivFix( temp[0], temp_scale );
 181         temp[1] = FT_DivFix( temp[1], temp_scale );
 182         temp[2] = FT_DivFix( temp[2], temp_scale );
 183         temp[4] = FT_DivFix( temp[4], temp_scale );
 184         temp[5] = FT_DivFix( temp[5], temp_scale );
 185         temp[3] = 0x10000L;
 186       }
 187
 188       matrix->xx = temp[0];
 189       matrix->yx = temp[1];
 190       matrix->xy = temp[2];
 191       matrix->yy = temp[3];
 192
 193       /* note that the font offsets are expressed in integer font units */
 194       offset->x  = temp[4] >> 16;
 195       offset->y  = temp[5] >> 16;
 196     }
 197
 198     return CID_Err_Ok;      /* this is a callback function; */
 199                             /* we must return an error code */
 200   }
 201
 202
 203   FT_CALLBACK_DEF( FT_Error )
 204   parse_fd_array( CID_Face     face,
 205                   CID_Parser*  parser )
 206   {
 207     CID_FaceInfo  cid    = &face->cid;
 208     FT_Memory     memory = face->root.memory;
 209     FT_Error      error  = CID_Err_Ok;
 210     FT_Long       num_dicts;
 211
 212
 213     num_dicts = cid_parser_to_int( parser );
 214
 215     if ( !cid->font_dicts )
 216     {
 217       FT_Int  n;
 218
 219
 220       if ( FT_NEW_ARRAY( cid->font_dicts, num_dicts ) )
 221         goto Exit;
 222
 223       cid->num_dicts = (FT_UInt)num_dicts;
 224
 225       /* don't forget to set a few defaults */
 226       for ( n = 0; n < cid->num_dicts; n++ )
 227       {
 228         CID_FaceDict  dict = cid->font_dicts + n;
 229
 230
 231         /* default value for lenIV */
 232         dict->private_dict.lenIV = 4;
 233       }
 234     }
 235
 236   Exit:
 237     return error;
 238   }
 239
 240
 241   /* by mistake, `expansion_factor' appears both in PS_PrivateRec */
 242   /* and CID_FaceDictRec (both are public header files and can't  */
 243   /* changed); we simply copy the value                           */
 244
 245   FT_CALLBACK_DEF( FT_Error )
 246   parse_expansion_factor( CID_Face     face,
 247                           CID_Parser*  parser )
 248   {
 249     CID_FaceDict  dict;
 250
 251
 252     if ( parser->num_dict >= 0 )
 253     {
 254       dict = face->cid.font_dicts + parser->num_dict;
 255
 256       dict->expansion_factor              = cid_parser_to_fixed( parser, 0 );
 257       dict->private_dict.expansion_factor = dict->expansion_factor;
 258     }
 259
 260     return CID_Err_Ok;
 261   }
 262
 263
 264   static
 265   const T1_FieldRec  cid_field_records[] =
 266   {
 267
 268 #include "cidtoken.h"
 269
 270     T1_FIELD_CALLBACK( "FDArray",         parse_fd_array, 0 )
 271     T1_FIELD_CALLBACK( "FontMatrix",      parse_font_matrix, 0 )
 272     T1_FIELD_CALLBACK( "ExpansionFactor", parse_expansion_factor, 0 )
 273
 274     { 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0, 0 }
 275   };
 276
 277
 278   static FT_Error
 279   cid_parse_dict( CID_Face     face,
 280                   CID_Loader*  loader,
 281                   FT_Byte*     base,
 282                   FT_Long      size )
 283   {
 284     CID_Parser*  parser = &loader->parser;
 285
 286
 287     parser->root.cursor = base;
 288     parser->root.limit  = base + size;
 289     parser->root.error  = CID_Err_Ok;
 290
 291     {
 292       FT_Byte*  cur   = base;
 293       FT_Byte*  limit = cur + size;
 294
 295
 296       for (;;)
 297       {
 298         FT_Byte*  newlimit;
 299
 300
 301         parser->root.cursor = cur;
 302         cid_parser_skip_spaces( parser );
 303
 304         if ( parser->root.cursor >= limit )
 305           newlimit = limit - 1 - 17;
 306         else
 307           newlimit = parser->root.cursor - 17;
 308
 309         /* look for `%ADOBeginFontDict' */
 310         for ( ; cur < newlimit; cur++ )
 311         {
 312           if ( *cur == '%'                                            &&
 313                ft_strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 )
 314           {
 315             /* if /FDArray was found, then cid->num_dicts is > 0, and */
 316             /* we can start increasing parser->num_dict               */
 317             if ( face->cid.num_dicts > 0 )
 318               parser->num_dict++;
 319           }
 320         }
 321
 322         cur = parser->root.cursor;
 323         /* no error can occur in cid_parser_skip_spaces */
 324         if ( cur >= limit )
 325           break;
 326
 327         cid_parser_skip_PS_token( parser );
 328         if ( parser->root.cursor >= limit || parser->root.error )
 329           break;
 330
 331         /* look for immediates */
 332         if ( *cur == '/' && cur + 2 < limit )
 333         {
 334           FT_PtrDist  len;
 335
 336
 337           cur++;
 338           len = parser->root.cursor - cur;
 339
 340           if ( len > 0 && len < 22 )
 341           {
 342             /* now compare the immediate name to the keyword table */
 343             T1_Field  keyword = (T1_Field)cid_field_records;
 344
 345
 346             for (;;)
 347             {
 348               FT_Byte*  name;
 349
 350
 351               name = (FT_Byte*)keyword->ident;
 352               if ( !name )
 353                 break;
 354
 355               if ( cur[0] == name[0]                                 &&
 356                    len == (FT_PtrDist)ft_strlen( (const char*)name ) )
 357               {
 358                 FT_PtrDist  n;
 359
 360
 361                 for ( n = 1; n < len; n++ )
 362                   if ( cur[n] != name[n] )
 363                     break;
 364
 365                 if ( n >= len )
 366                 {
 367                   /* we found it - run the parsing callback */
 368                   parser->root.error = cid_load_keyword( face,
 369                                                          loader,
 370                                                          keyword );
 371                   if ( parser->root.error )
 372                     return parser->root.error;
 373                   break;
 374                 }
 375               }
 376               keyword++;
 377             }
 378           }
 379         }
 380
 381         cur = parser->root.cursor;
 382       }
 383     }
 384     return parser->root.error;
 385   }
 386
 387
 388   /* read the subrmap and the subrs of each font dict */
 389   static FT_Error
 390   cid_read_subrs( CID_Face  face )
 391   {
 392     CID_FaceInfo   cid    = &face->cid;
 393     FT_Memory      memory = face->root.memory;
 394     FT_Stream      stream = face->cid_stream;
 395     FT_Error       error;
 396     FT_Int         n;
 397     CID_Subrs      subr;
 398     FT_UInt        max_offsets = 0;
 399     FT_ULong*      offsets = 0;
 400     PSAux_Service  psaux = (PSAux_Service)face->psaux;
 401
 402
 403     if ( FT_NEW_ARRAY( face->subrs, cid->num_dicts ) )
 404       goto Exit;
 405
 406     subr = face->subrs;
 407     for ( n = 0; n < cid->num_dicts; n++, subr++ )
 408     {
 409       CID_FaceDict  dict  = cid->font_dicts + n;
 410       FT_Int        lenIV = dict->private_dict.lenIV;
 411       FT_UInt       count, num_subrs = dict->num_subrs;
 412       FT_ULong      data_len;
 413       FT_Byte*      p;
 414
 415
 416       /* reallocate offsets array if needed */
 417       if ( num_subrs + 1 > max_offsets )
 418       {
 419         FT_UInt  new_max = FT_PAD_CEIL( num_subrs + 1, 4 );
 420
 421
 422         if ( FT_RENEW_ARRAY( offsets, max_offsets, new_max ) )
 423           goto Fail;
 424
 425         max_offsets = new_max;
 426       }
 427
 428       /* read the subrmap's offsets */
 429       if ( FT_STREAM_SEEK( cid->data_offset + dict->subrmap_offset ) ||
 430            FT_FRAME_ENTER( ( num_subrs + 1 ) * dict->sd_bytes )      )
 431         goto Fail;
 432
 433       p = (FT_Byte*)stream->cursor;
 434       for ( count = 0; count <= num_subrs; count++ )
 435         offsets[count] = cid_get_offset( &p, (FT_Byte)dict->sd_bytes );
 436
 437       FT_FRAME_EXIT();
 438
 439       /* now, compute the size of subrs charstrings, */
 440       /* allocate, and read them                     */
 441       data_len = offsets[num_subrs] - offsets[0];
 442
 443       if ( FT_NEW_ARRAY( subr->code, num_subrs + 1 ) ||
 444                FT_ALLOC( subr->code[0], data_len )   )
 445         goto Fail;
 446
 447       if ( FT_STREAM_SEEK( cid->data_offset + offsets[0] ) ||
 448            FT_STREAM_READ( subr->code[0], data_len )  )
 449         goto Fail;
 450
 451       /* set up pointers */
 452       for ( count = 1; count <= num_subrs; count++ )
 453       {
 454         FT_ULong  len;
 455
 456
 457         len               = offsets[count] - offsets[count - 1];
 458         subr->code[count] = subr->code[count - 1] + len;
 459       }
 460
 461       /* decrypt subroutines, but only if lenIV >= 0 */
 462       if ( lenIV >= 0 )
 463       {
 464         for ( count = 0; count < num_subrs; count++ )
 465         {
 466           FT_ULong  len;
 467
 468
 469           len = offsets[count + 1] - offsets[count];
 470           psaux->t1_decrypt( subr->code[count], len, 4330 );
 471         }
 472       }
 473
 474       subr->num_subrs = num_subrs;
 475     }
 476
 477   Exit:
 478     FT_FREE( offsets );
 479     return error;
 480
 481   Fail:
 482     if ( face->subrs )
 483     {
 484       for ( n = 0; n < cid->num_dicts; n++ )
 485       {
 486         if ( face->subrs[n].code )
 487           FT_FREE( face->subrs[n].code[0] );
 488
 489         FT_FREE( face->subrs[n].code );
 490       }
 491       FT_FREE( face->subrs );
 492     }
 493     goto Exit;
 494   }
 495
 496
 497   static void
 498   t1_init_loader( CID_Loader*  loader,
 499                   CID_Face     face )
 500   {
 501     FT_UNUSED( face );
 502
 503     FT_MEM_ZERO( loader, sizeof ( *loader ) );
 504   }
 505
 506
 507   static void
 508   t1_done_loader( CID_Loader*  loader )
 509   {
 510     CID_Parser*  parser = &loader->parser;
 511
 512
 513     /* finalize parser */
 514     cid_parser_done( parser );
 515   }
 516
 517
 518   static FT_Error
 519   cid_hex_to_binary( FT_Byte*  data,
 520                      FT_Long   data_len,
 521                      FT_ULong  offset,
 522                      CID_Face  face )
 523   {
 524     FT_Stream  stream = face->root.stream;
 525     FT_Error   error;
 526
 527     FT_Byte    buffer[256];
 528     FT_Byte   *p, *plimit;
 529     FT_Byte   *d, *dlimit;
 530     FT_Byte    val;
 531
 532     FT_Bool    upper_nibble, done;
 533
 534
 535     if ( FT_STREAM_SEEK( offset ) )
 536       goto Exit;
 537
 538     d      = data;
 539     dlimit = d + data_len;
 540     p      = buffer;
 541     plimit = p;
 542
 543     upper_nibble = 1;
 544     done         = 0;
 545
 546     while ( d < dlimit )
 547     {
 548       if ( p >= plimit )
 549       {
 550         FT_ULong  oldpos = FT_STREAM_POS();
 551         FT_ULong  size   = stream->size - oldpos;
 552
 553
 554         if ( size == 0 )
 555         {
 556           error = CID_Err_Syntax_Error;
 557           goto Exit;
 558         }
 559
 560         if ( FT_STREAM_READ( buffer, 256 > size ? size : 256 ) )
 561           goto Exit;
 562         p      = buffer;
 563         plimit = p + FT_STREAM_POS() - oldpos;
 564       }
 565
 566       if ( ft_isdigit( *p ) )
 567         val = (FT_Byte)( *p - '0' );
 568       else if ( *p >= 'a' && *p <= 'f' )
 569         val = (FT_Byte)( *p - 'a' );
 570       else if ( *p >= 'A' && *p <= 'F' )
 571         val = (FT_Byte)( *p - 'A' + 10 );
 572       else if ( *p == ' '  ||
 573                 *p == '\t' ||
 574                 *p == '\r' ||
 575                 *p == '\n' ||
 576                 *p == '\f' ||
 577                 *p == '\0' )
 578       {
 579         p++;
 580         continue;
 581       }
 582       else if ( *p == '>' )
 583       {
 584         val  = 0;
 585         done = 1;
 586       }
 587       else
 588       {
 589         error = CID_Err_Syntax_Error;
 590         goto Exit;
 591       }
 592
 593       if ( upper_nibble )
 594         *d = (FT_Byte)( val << 4 );
 595       else
 596       {
 597         *d = (FT_Byte)( *d + val );
 598         d++;
 599       }
 600
 601       upper_nibble = (FT_Byte)( 1 - upper_nibble );
 602
 603       if ( done )
 604         break;
 605
 606       p++;
 607     }
 608
 609     error = CID_Err_Ok;
 610
 611   Exit:
 612     return error;
 613   }
 614
 615
 616   FT_LOCAL_DEF( FT_Error )
 617   cid_face_open( CID_Face  face,
 618                  FT_Int    face_index )
 619   {
 620     CID_Loader   loader;
 621     CID_Parser*  parser;
 622     FT_Memory    memory = face->root.memory;
 623     FT_Error     error;
 624
 625
 626     t1_init_loader( &loader, face );
 627
 628     parser = &loader.parser;
 629     error = cid_parser_new( parser, face->root.stream, face->root.memory,
 630                             (PSAux_Service)face->psaux );
 631     if ( error )
 632       goto Exit;
 633
 634     error = cid_parse_dict( face, &loader,
 635                             parser->postscript,
 636                             parser->postscript_len );
 637     if ( error )
 638       goto Exit;
 639
 640     if ( face_index < 0 )
 641       goto Exit;
 642
 643     if ( FT_NEW( face->cid_stream ) )
 644       goto Exit;
 645
 646     if ( parser->binary_length )
 647     {
 648       /* we must convert the data section from hexadecimal to binary */
 649       if ( FT_ALLOC( face->binary_data, parser->binary_length )         ||
 650            cid_hex_to_binary( face->binary_data, parser->binary_length,
 651                               parser->data_offset, face )               )
 652         goto Exit;
 653
 654       FT_Stream_OpenMemory( face->cid_stream,
 655                             face->binary_data, parser->binary_length );
 656       face->cid.data_offset = 0;
 657     }
 658     else
 659     {
 660       *face->cid_stream     = *face->root.stream;
 661       face->cid.data_offset = loader.parser.data_offset;
 662     }
 663
 664     error = cid_read_subrs( face );
 665
 666   Exit:
 667     t1_done_loader( &loader );
 668     return error;
 669   }
 670
 671
 672 /* END */