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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* t1parse.c */ | |
| 4 /* */ | |
| 5 /* Type 1 parser (body). */ | |
| 6 /* */ | |
| 7 /* Copyright 1996-2005, 2008, 2009, 2012, 2013 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 /*************************************************************************/ | |
| 20 /* */ | |
| 21 /* The Type 1 parser is in charge of the following: */ | |
| 22 /* */ | |
| 23 /* - provide an implementation of a growing sequence of objects called */ | |
| 24 /* a `T1_Table' (used to build various tables needed by the loader). */ | |
| 25 /* */ | |
| 26 /* - opening .pfb and .pfa files to extract their top-level and private */ | |
| 27 /* dictionaries. */ | |
| 28 /* */ | |
| 29 /* - read numbers, arrays & strings from any dictionary. */ | |
| 30 /* */ | |
| 31 /* See `t1load.c' to see how data is loaded from the font file. */ | |
| 32 /* */ | |
| 33 /*************************************************************************/ | |
| 34 | |
| 35 | |
| 36 #include "../../include/ft2build.h" | |
| 37 #include "../../include/freetype/internal/ftdebug.h" | |
| 38 #include "../../include/freetype/internal/ftstream.h" | |
| 39 #include "../../include/freetype/internal/psaux.h" | |
| 40 | |
| 41 #include "t1parse.h" | |
| 42 | |
| 43 #include "t1errors.h" | |
| 44 | |
| 45 | |
| 46 /*************************************************************************/ | |
| 47 /* */ | |
| 48 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ | |
| 49 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ | |
| 50 /* messages during execution. */ | |
| 51 /* */ | |
| 52 #undef FT_COMPONENT | |
| 53 #define FT_COMPONENT trace_t1parse | |
| 54 | |
| 55 | |
| 56 /*************************************************************************/ | |
| 57 /*************************************************************************/ | |
| 58 /*************************************************************************/ | |
| 59 /***** *****/ | |
| 60 /***** INPUT STREAM PARSER *****/ | |
| 61 /***** *****/ | |
| 62 /*************************************************************************/ | |
| 63 /*************************************************************************/ | |
| 64 /*************************************************************************/ | |
| 65 | |
| 66 | |
| 67 /* see Adobe Technical Note 5040.Download_Fonts.pdf */ | |
| 68 | |
| 69 static FT_Error | |
| 70 read_pfb_tag( FT_Stream stream, | |
| 71 FT_UShort *atag, | |
| 72 FT_ULong *asize ) | |
| 73 { | |
| 74 FT_Error error; | |
| 75 FT_UShort tag; | |
| 76 FT_ULong size; | |
| 77 | |
| 78 | |
| 79 *atag = 0; | |
| 80 *asize = 0; | |
| 81 | |
| 82 if ( !FT_READ_USHORT( tag ) ) | |
| 83 { | |
| 84 if ( tag == 0x8001U || tag == 0x8002U ) | |
| 85 { | |
| 86 if ( !FT_READ_ULONG_LE( size ) ) | |
| 87 *asize = size; | |
| 88 } | |
| 89 | |
| 90 *atag = tag; | |
| 91 } | |
| 92 | |
| 93 return error; | |
| 94 } | |
| 95 | |
| 96 | |
| 97 static FT_Error | |
| 98 check_type1_format( FT_Stream stream, | |
| 99 const char* header_string, | |
| 100 size_t header_length ) | |
| 101 { | |
| 102 FT_Error error; | |
| 103 FT_UShort tag; | |
| 104 FT_ULong dummy; | |
| 105 | |
| 106 | |
| 107 if ( FT_STREAM_SEEK( 0 ) ) | |
| 108 goto Exit; | |
| 109 | |
| 110 error = read_pfb_tag( stream, &tag, &dummy ); | |
| 111 if ( error ) | |
| 112 goto Exit; | |
| 113 | |
| 114 /* We assume that the first segment in a PFB is always encoded as */ | |
| 115 /* text. This might be wrong (and the specification doesn't insist */ | |
| 116 /* on that), but we have never seen a counterexample. */ | |
| 117 if ( tag != 0x8001U && FT_STREAM_SEEK( 0 ) ) | |
| 118 goto Exit; | |
| 119 | |
| 120 if ( !FT_FRAME_ENTER( header_length ) ) | |
| 121 { | |
| 122 error = FT_Err_Ok; | |
| 123 | |
| 124 if ( ft_memcmp( stream->cursor, header_string, header_length ) != 0 ) | |
| 125 error = FT_THROW( Unknown_File_Format ); | |
| 126 | |
| 127 FT_FRAME_EXIT(); | |
| 128 } | |
| 129 | |
| 130 Exit: | |
| 131 return error; | |
| 132 } | |
| 133 | |
| 134 | |
| 135 FT_LOCAL_DEF( FT_Error ) | |
| 136 T1_New_Parser( T1_Parser parser, | |
| 137 FT_Stream stream, | |
| 138 FT_Memory memory, | |
| 139 PSAux_Service psaux ) | |
| 140 { | |
| 141 FT_Error error; | |
| 142 FT_UShort tag; | |
| 143 FT_ULong size; | |
| 144 | |
| 145 | |
| 146 psaux->ps_parser_funcs->init( &parser->root, 0, 0, memory ); | |
| 147 | |
| 148 parser->stream = stream; | |
| 149 parser->base_len = 0; | |
| 150 parser->base_dict = 0; | |
| 151 parser->private_len = 0; | |
| 152 parser->private_dict = 0; | |
| 153 parser->in_pfb = 0; | |
| 154 parser->in_memory = 0; | |
| 155 parser->single_block = 0; | |
| 156 | |
| 157 /* check the header format */ | |
| 158 error = check_type1_format( stream, "%!PS-AdobeFont", 14 ); | |
| 159 if ( error ) | |
| 160 { | |
| 161 if ( FT_ERR_NEQ( error, Unknown_File_Format ) ) | |
| 162 goto Exit; | |
| 163 | |
| 164 error = check_type1_format( stream, "%!FontType", 10 ); | |
| 165 if ( error ) | |
| 166 { | |
| 167 FT_TRACE2(( " not a Type 1 font\n" )); | |
| 168 goto Exit; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 /******************************************************************/ | |
| 173 /* */ | |
| 174 /* Here a short summary of what is going on: */ | |
| 175 /* */ | |
| 176 /* When creating a new Type 1 parser, we try to locate and load */ | |
| 177 /* the base dictionary if this is possible (i.e., for PFB */ | |
| 178 /* files). Otherwise, we load the whole font into memory. */ | |
| 179 /* */ | |
| 180 /* When `loading' the base dictionary, we only setup pointers */ | |
| 181 /* in the case of a memory-based stream. Otherwise, we */ | |
| 182 /* allocate and load the base dictionary in it. */ | |
| 183 /* */ | |
| 184 /* parser->in_pfb is set if we are in a binary (`.pfb') font. */ | |
| 185 /* parser->in_memory is set if we have a memory stream. */ | |
| 186 /* */ | |
| 187 | |
| 188 /* try to compute the size of the base dictionary; */ | |
| 189 /* look for a Postscript binary file tag, i.e., 0x8001 */ | |
| 190 if ( FT_STREAM_SEEK( 0L ) ) | |
| 191 goto Exit; | |
| 192 | |
| 193 error = read_pfb_tag( stream, &tag, &size ); | |
| 194 if ( error ) | |
| 195 goto Exit; | |
| 196 | |
| 197 if ( tag != 0x8001U ) | |
| 198 { | |
| 199 /* assume that this is a PFA file for now; an error will */ | |
| 200 /* be produced later when more things are checked */ | |
| 201 if ( FT_STREAM_SEEK( 0L ) ) | |
| 202 goto Exit; | |
| 203 size = stream->size; | |
| 204 } | |
| 205 else | |
| 206 parser->in_pfb = 1; | |
| 207 | |
| 208 /* now, try to load `size' bytes of the `base' dictionary we */ | |
| 209 /* found previously */ | |
| 210 | |
| 211 /* if it is a memory-based resource, set up pointers */ | |
| 212 if ( !stream->read ) | |
| 213 { | |
| 214 parser->base_dict = (FT_Byte*)stream->base + stream->pos; | |
| 215 parser->base_len = size; | |
| 216 parser->in_memory = 1; | |
| 217 | |
| 218 /* check that the `size' field is valid */ | |
| 219 if ( FT_STREAM_SKIP( size ) ) | |
| 220 goto Exit; | |
| 221 } | |
| 222 else | |
| 223 { | |
| 224 /* read segment in memory -- this is clumsy, but so does the format */ | |
| 225 if ( FT_ALLOC( parser->base_dict, size ) || | |
| 226 FT_STREAM_READ( parser->base_dict, size ) ) | |
| 227 goto Exit; | |
| 228 parser->base_len = size; | |
| 229 } | |
| 230 | |
| 231 parser->root.base = parser->base_dict; | |
| 232 parser->root.cursor = parser->base_dict; | |
| 233 parser->root.limit = parser->root.cursor + parser->base_len; | |
| 234 | |
| 235 Exit: | |
| 236 if ( error && !parser->in_memory ) | |
| 237 FT_FREE( parser->base_dict ); | |
| 238 | |
| 239 return error; | |
| 240 } | |
| 241 | |
| 242 | |
| 243 FT_LOCAL_DEF( void ) | |
| 244 T1_Finalize_Parser( T1_Parser parser ) | |
| 245 { | |
| 246 FT_Memory memory = parser->root.memory; | |
| 247 | |
| 248 | |
| 249 /* always free the private dictionary */ | |
| 250 FT_FREE( parser->private_dict ); | |
| 251 | |
| 252 /* free the base dictionary only when we have a disk stream */ | |
| 253 if ( !parser->in_memory ) | |
| 254 FT_FREE( parser->base_dict ); | |
| 255 | |
| 256 parser->root.funcs.done( &parser->root ); | |
| 257 } | |
| 258 | |
| 259 | |
| 260 FT_LOCAL_DEF( FT_Error ) | |
| 261 T1_Get_Private_Dict( T1_Parser parser, | |
| 262 PSAux_Service psaux ) | |
| 263 { | |
| 264 FT_Stream stream = parser->stream; | |
| 265 FT_Memory memory = parser->root.memory; | |
| 266 FT_Error error = FT_Err_Ok; | |
| 267 FT_ULong size; | |
| 268 | |
| 269 | |
| 270 if ( parser->in_pfb ) | |
| 271 { | |
| 272 /* in the case of the PFB format, the private dictionary can be */ | |
| 273 /* made of several segments. We thus first read the number of */ | |
| 274 /* segments to compute the total size of the private dictionary */ | |
| 275 /* then re-read them into memory. */ | |
| 276 FT_Long start_pos = FT_STREAM_POS(); | |
| 277 FT_UShort tag; | |
| 278 | |
| 279 | |
| 280 parser->private_len = 0; | |
| 281 for (;;) | |
| 282 { | |
| 283 error = read_pfb_tag( stream, &tag, &size ); | |
| 284 if ( error ) | |
| 285 goto Fail; | |
| 286 | |
| 287 if ( tag != 0x8002U ) | |
| 288 break; | |
| 289 | |
| 290 parser->private_len += size; | |
| 291 | |
| 292 if ( FT_STREAM_SKIP( size ) ) | |
| 293 goto Fail; | |
| 294 } | |
| 295 | |
| 296 /* Check that we have a private dictionary there */ | |
| 297 /* and allocate private dictionary buffer */ | |
| 298 if ( parser->private_len == 0 ) | |
| 299 { | |
| 300 FT_ERROR(( "T1_Get_Private_Dict:" | |
| 301 " invalid private dictionary section\n" )); | |
| 302 error = FT_THROW( Invalid_File_Format ); | |
| 303 goto Fail; | |
| 304 } | |
| 305 | |
| 306 if ( FT_STREAM_SEEK( start_pos ) || | |
| 307 FT_ALLOC( parser->private_dict, parser->private_len ) ) | |
| 308 goto Fail; | |
| 309 | |
| 310 parser->private_len = 0; | |
| 311 for (;;) | |
| 312 { | |
| 313 error = read_pfb_tag( stream, &tag, &size ); | |
| 314 if ( error || tag != 0x8002U ) | |
| 315 { | |
| 316 error = FT_Err_Ok; | |
| 317 break; | |
| 318 } | |
| 319 | |
| 320 if ( FT_STREAM_READ( parser->private_dict + parser->private_len, | |
| 321 size ) ) | |
| 322 goto Fail; | |
| 323 | |
| 324 parser->private_len += size; | |
| 325 } | |
| 326 } | |
| 327 else | |
| 328 { | |
| 329 /* We have already `loaded' the whole PFA font file into memory; */ | |
| 330 /* if this is a memory resource, allocate a new block to hold */ | |
| 331 /* the private dict. Otherwise, simply overwrite into the base */ | |
| 332 /* dictionary block in the heap. */ | |
| 333 | |
| 334 /* first of all, look at the `eexec' keyword */ | |
| 335 FT_Byte* cur = parser->base_dict; | |
| 336 FT_Byte* limit = cur + parser->base_len; | |
| 337 FT_Byte c; | |
| 338 | |
| 339 | |
| 340 Again: | |
| 341 for (;;) | |
| 342 { | |
| 343 c = cur[0]; | |
| 344 if ( c == 'e' && cur + 9 < limit ) /* 9 = 5 letters for `eexec' + */ | |
| 345 /* whitespace + 4 chars */ | |
| 346 { | |
| 347 if ( cur[1] == 'e' && | |
| 348 cur[2] == 'x' && | |
| 349 cur[3] == 'e' && | |
| 350 cur[4] == 'c' ) | |
| 351 break; | |
| 352 } | |
| 353 cur++; | |
| 354 if ( cur >= limit ) | |
| 355 { | |
| 356 FT_ERROR(( "T1_Get_Private_Dict:" | |
| 357 " could not find `eexec' keyword\n" )); | |
| 358 error = FT_THROW( Invalid_File_Format ); | |
| 359 goto Exit; | |
| 360 } | |
| 361 } | |
| 362 | |
| 363 /* check whether `eexec' was real -- it could be in a comment */ | |
| 364 /* or string (as e.g. in u003043t.gsf from ghostscript) */ | |
| 365 | |
| 366 parser->root.cursor = parser->base_dict; | |
| 367 /* set limit to `eexec' + whitespace + 4 characters */ | |
| 368 parser->root.limit = cur + 10; | |
| 369 | |
| 370 cur = parser->root.cursor; | |
| 371 limit = parser->root.limit; | |
| 372 | |
| 373 while ( cur < limit ) | |
| 374 { | |
| 375 if ( *cur == 'e' && ft_strncmp( (char*)cur, "eexec", 5 ) == 0 ) | |
| 376 goto Found; | |
| 377 | |
| 378 T1_Skip_PS_Token( parser ); | |
| 379 if ( parser->root.error ) | |
| 380 break; | |
| 381 T1_Skip_Spaces ( parser ); | |
| 382 cur = parser->root.cursor; | |
| 383 } | |
| 384 | |
| 385 /* we haven't found the correct `eexec'; go back and continue */ | |
| 386 /* searching */ | |
| 387 | |
| 388 cur = limit; | |
| 389 limit = parser->base_dict + parser->base_len; | |
| 390 goto Again; | |
| 391 | |
| 392 /* now determine where to write the _encrypted_ binary private */ | |
| 393 /* dictionary. We overwrite the base dictionary for disk-based */ | |
| 394 /* resources and allocate a new block otherwise */ | |
| 395 | |
| 396 Found: | |
| 397 parser->root.limit = parser->base_dict + parser->base_len; | |
| 398 | |
| 399 T1_Skip_PS_Token( parser ); | |
| 400 cur = parser->root.cursor; | |
| 401 limit = parser->root.limit; | |
| 402 | |
| 403 /* according to the Type1 spec, the first cipher byte must not be */ | |
| 404 /* an ASCII whitespace character code (blank, tab, carriage return */ | |
| 405 /* or line feed). We have seen Type 1 fonts with two line feed */ | |
| 406 /* characters... So skip now all whitespace character codes. */ | |
| 407 while ( cur < limit && | |
| 408 ( *cur == ' ' || | |
| 409 *cur == '\t' || | |
| 410 *cur == '\r' || | |
| 411 *cur == '\n' ) ) | |
| 412 ++cur; | |
| 413 if ( cur >= limit ) | |
| 414 { | |
| 415 FT_ERROR(( "T1_Get_Private_Dict:" | |
| 416 " `eexec' not properly terminated\n" )); | |
| 417 error = FT_THROW( Invalid_File_Format ); | |
| 418 goto Exit; | |
| 419 } | |
| 420 | |
| 421 size = (FT_ULong)( parser->base_len - ( cur - parser->base_dict ) ); | |
| 422 | |
| 423 if ( parser->in_memory ) | |
| 424 { | |
| 425 /* note that we allocate one more byte to put a terminating `0' */ | |
| 426 if ( FT_ALLOC( parser->private_dict, size + 1 ) ) | |
| 427 goto Fail; | |
| 428 parser->private_len = size; | |
| 429 } | |
| 430 else | |
| 431 { | |
| 432 parser->single_block = 1; | |
| 433 parser->private_dict = parser->base_dict; | |
| 434 parser->private_len = size; | |
| 435 parser->base_dict = 0; | |
| 436 parser->base_len = 0; | |
| 437 } | |
| 438 | |
| 439 /* now determine whether the private dictionary is encoded in binary */ | |
| 440 /* or hexadecimal ASCII format -- decode it accordingly */ | |
| 441 | |
| 442 /* we need to access the next 4 bytes (after the final whitespace */ | |
| 443 /* following the `eexec' keyword); if they all are hexadecimal */ | |
| 444 /* digits, then we have a case of ASCII storage */ | |
| 445 | |
| 446 if ( cur + 3 < limit && | |
| 447 ft_isxdigit( cur[0] ) && ft_isxdigit( cur[1] ) && | |
| 448 ft_isxdigit( cur[2] ) && ft_isxdigit( cur[3] ) ) | |
| 449 { | |
| 450 /* ASCII hexadecimal encoding */ | |
| 451 FT_Long len; | |
| 452 | |
| 453 | |
| 454 parser->root.cursor = cur; | |
| 455 (void)psaux->ps_parser_funcs->to_bytes( &parser->root, | |
| 456 parser->private_dict, | |
| 457 parser->private_len, | |
| 458 &len, | |
| 459 0 ); | |
| 460 parser->private_len = len; | |
| 461 | |
| 462 /* put a safeguard */ | |
| 463 parser->private_dict[len] = '\0'; | |
| 464 } | |
| 465 else | |
| 466 /* binary encoding -- copy the private dict */ | |
| 467 FT_MEM_MOVE( parser->private_dict, cur, size ); | |
| 468 } | |
| 469 | |
| 470 /* we now decrypt the encoded binary private dictionary */ | |
| 471 psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U ); | |
| 472 | |
| 473 if ( parser->private_len < 4 ) | |
| 474 { | |
| 475 FT_ERROR(( "T1_Get_Private_Dict:" | |
| 476 " invalid private dictionary section\n" )); | |
| 477 error = FT_THROW( Invalid_File_Format ); | |
| 478 goto Fail; | |
| 479 } | |
| 480 | |
| 481 /* replace the four random bytes at the beginning with whitespace */ | |
| 482 parser->private_dict[0] = ' '; | |
| 483 parser->private_dict[1] = ' '; | |
| 484 parser->private_dict[2] = ' '; | |
| 485 parser->private_dict[3] = ' '; | |
| 486 | |
| 487 parser->root.base = parser->private_dict; | |
| 488 parser->root.cursor = parser->private_dict; | |
| 489 parser->root.limit = parser->root.cursor + parser->private_len; | |
| 490 | |
| 491 Fail: | |
| 492 Exit: | |
| 493 return error; | |
| 494 } | |
| 495 | |
| 496 | |
| 497 /* END */ | |
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Chromium Code Reviews
Issue 815103002:
Update freetype to 2.5.4. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master