bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "cff.h" |
| 6 | |
| 7 | #include <cstring> |
| 8 | #include <utility> // std::pair |
| 9 | #include <vector> |
| 10 | |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 11 | #include "cff_type2_charstring.h" |
| 12 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 13 | // CFF - PostScript font program (Compact Font Format) table |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 14 | // http://www.microsoft.com/typography/otspec/cff.htm |
| 15 | // http://www.microsoft.com/typography/otspec/cffspec.htm |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 16 | |
| 17 | namespace { |
| 18 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 19 | enum DICT_OPERAND_TYPE { |
| 20 | DICT_OPERAND_INTEGER, |
| 21 | DICT_OPERAND_REAL, |
agl@chromium.org | 7d18d4e | 2010-10-20 20:06:53 +0000 | [diff] [blame] | 22 | DICT_OPERATOR, |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 23 | }; |
| 24 | |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 25 | enum DICT_DATA_TYPE { |
| 26 | DICT_DATA_TOPLEVEL, |
agl@chromium.org | 7d18d4e | 2010-10-20 20:06:53 +0000 | [diff] [blame] | 27 | DICT_DATA_FDARRAY, |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 28 | }; |
| 29 | |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 30 | enum FONT_FORMAT { |
| 31 | FORMAT_UNKNOWN, |
| 32 | FORMAT_CID_KEYED, |
| 33 | FORMAT_OTHER, // Including synthetic fonts |
| 34 | }; |
| 35 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 36 | // see Appendix. A |
| 37 | const size_t kNStdString = 390; |
| 38 | |
| 39 | bool ReadOffset(ots::Buffer *table, uint8_t off_size, uint32_t *offset) { |
| 40 | if (off_size > 4) { |
| 41 | return OTS_FAILURE(); |
| 42 | } |
| 43 | |
| 44 | uint32_t tmp32 = 0; |
| 45 | for (unsigned i = 0; i < off_size; ++i) { |
| 46 | uint8_t tmp8 = 0; |
| 47 | if (!table->ReadU8(&tmp8)) { |
| 48 | return OTS_FAILURE(); |
| 49 | } |
| 50 | tmp32 <<= 8; |
| 51 | tmp32 += tmp8; |
| 52 | } |
| 53 | *offset = tmp32; |
| 54 | return true; |
| 55 | } |
| 56 | |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 57 | bool ParseIndex(ots::Buffer *table, ots::CFFIndex *index) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 58 | index->off_size = 0; |
| 59 | index->offsets.clear(); |
| 60 | |
| 61 | if (!table->ReadU16(&(index->count))) { |
| 62 | return OTS_FAILURE(); |
| 63 | } |
| 64 | if (index->count == 0) { |
yusukes@chromium.org | 0b9ec83 | 2009-11-23 09:59:05 +0000 | [diff] [blame] | 65 | // An empty INDEX. |
bashi@chromium.org | 4b6b2a8 | 2011-12-19 23:47:35 +0000 | [diff] [blame] | 66 | index->offset_to_next = table->offset(); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 67 | return true; |
| 68 | } |
| 69 | |
| 70 | if (!table->ReadU8(&(index->off_size))) { |
| 71 | return OTS_FAILURE(); |
| 72 | } |
| 73 | if ((index->off_size == 0) || |
| 74 | (index->off_size > 4)) { |
| 75 | return OTS_FAILURE(); |
| 76 | } |
| 77 | |
| 78 | const size_t array_size = (index->count + 1) * index->off_size; |
| 79 | // less than ((64k + 1) * 4), thus does not overflow. |
| 80 | const size_t object_data_offset = table->offset() + array_size; |
| 81 | // does not overflow too, since offset() <= 1GB. |
| 82 | |
| 83 | if (object_data_offset >= table->length()) { |
| 84 | return OTS_FAILURE(); |
| 85 | } |
| 86 | |
| 87 | for (unsigned i = 0; i <= index->count; ++i) { // '<=' is not a typo. |
agl@chromium.org | a0cb1e7 | 2010-04-27 18:37:36 +0000 | [diff] [blame] | 88 | uint32_t rel_offset = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 89 | if (!ReadOffset(table, index->off_size, &rel_offset)) { |
| 90 | return OTS_FAILURE(); |
| 91 | } |
| 92 | if (rel_offset < 1) { |
| 93 | return OTS_FAILURE(); |
| 94 | } |
| 95 | if (i == 0 && rel_offset != 1) { |
| 96 | return OTS_FAILURE(); |
| 97 | } |
| 98 | |
| 99 | if (rel_offset > table->length()) { |
| 100 | return OTS_FAILURE(); |
| 101 | } |
| 102 | |
| 103 | // does not underflow. |
| 104 | if (object_data_offset > table->length() - (rel_offset - 1)) { |
| 105 | return OTS_FAILURE(); |
| 106 | } |
| 107 | |
| 108 | index->offsets.push_back( |
| 109 | object_data_offset + (rel_offset - 1)); // less than length(), 1GB. |
| 110 | } |
| 111 | |
| 112 | for (unsigned i = 1; i < index->offsets.size(); ++i) { |
bashi@chromium.org | 071f0b3 | 2011-04-04 16:42:56 +0000 | [diff] [blame] | 113 | // We allow consecutive identical offsets here for zero-length strings. |
| 114 | // See http://crbug.com/69341 for more details. |
| 115 | if (index->offsets[i] < index->offsets[i - 1]) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 116 | return OTS_FAILURE(); |
| 117 | } |
| 118 | } |
| 119 | |
yusukes@chromium.org | 0b9ec83 | 2009-11-23 09:59:05 +0000 | [diff] [blame] | 120 | index->offset_to_next = index->offsets.back(); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 121 | return true; |
| 122 | } |
| 123 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 124 | bool ParseNameData( |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 125 | ots::Buffer *table, const ots::CFFIndex &index, std::string* out_name) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 126 | uint8_t name[256] = {0}; |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 127 | if (index.offsets.size() == 0) { // just in case. |
| 128 | return OTS_FAILURE(); |
| 129 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 130 | for (unsigned i = 1; i < index.offsets.size(); ++i) { |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 131 | const size_t length = index.offsets[i] - index.offsets[i - 1]; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 132 | // font names should be no longer than 127 characters. |
| 133 | if (length > 127) { |
| 134 | return OTS_FAILURE(); |
| 135 | } |
| 136 | |
| 137 | table->set_offset(index.offsets[i - 1]); |
| 138 | if (!table->Read(name, length)) { |
| 139 | return OTS_FAILURE(); |
| 140 | } |
| 141 | |
| 142 | for (size_t j = 0; j < length; ++j) { |
| 143 | // setting the first byte to NUL is allowed. |
| 144 | if (j == 0 && name[j] == 0) continue; |
| 145 | // non-ASCII characters are not recommended (except the first character). |
| 146 | if (name[j] < 33 || name[j] > 126) { |
| 147 | return OTS_FAILURE(); |
| 148 | } |
| 149 | // [, ], ... are not allowed. |
| 150 | if (std::strchr("[](){}<>/% ", name[j])) { |
| 151 | return OTS_FAILURE(); |
| 152 | } |
| 153 | } |
| 154 | } |
| 155 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 156 | *out_name = reinterpret_cast<char *>(name); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 157 | return true; |
| 158 | } |
| 159 | |
| 160 | bool CheckOffset(const std::pair<uint32_t, DICT_OPERAND_TYPE>& operand, |
| 161 | size_t table_length) { |
| 162 | if (operand.second != DICT_OPERAND_INTEGER) { |
| 163 | return OTS_FAILURE(); |
| 164 | } |
| 165 | if (operand.first >= table_length) { |
| 166 | return OTS_FAILURE(); |
| 167 | } |
| 168 | return true; |
| 169 | } |
| 170 | |
| 171 | bool CheckSid(const std::pair<uint32_t, DICT_OPERAND_TYPE>& operand, |
| 172 | size_t sid_max) { |
| 173 | if (operand.second != DICT_OPERAND_INTEGER) { |
| 174 | return OTS_FAILURE(); |
| 175 | } |
| 176 | if (operand.first > sid_max) { |
| 177 | return OTS_FAILURE(); |
| 178 | } |
| 179 | return true; |
| 180 | } |
| 181 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 182 | bool ParseDictDataBcd( |
| 183 | ots::Buffer *table, |
| 184 | std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| 185 | bool read_decimal_point = false; |
| 186 | bool read_e = false; |
| 187 | |
| 188 | uint8_t nibble = 0; |
| 189 | size_t count = 0; |
| 190 | while (true) { |
| 191 | if (!table->ReadU8(&nibble)) { |
| 192 | return OTS_FAILURE(); |
| 193 | } |
| 194 | if ((nibble & 0xf0) == 0xf0) { |
| 195 | if ((nibble & 0xf) == 0xf) { |
| 196 | // TODO(yusukes): would be better to store actual double value, |
| 197 | // rather than the dummy integer. |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 198 | operands->push_back(std::make_pair(static_cast<uint32_t>(0), |
| 199 | DICT_OPERAND_REAL)); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 200 | return true; |
| 201 | } |
| 202 | return OTS_FAILURE(); |
| 203 | } |
| 204 | if ((nibble & 0x0f) == 0x0f) { |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 205 | operands->push_back(std::make_pair(static_cast<uint32_t>(0), |
| 206 | DICT_OPERAND_REAL)); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 207 | return true; |
| 208 | } |
| 209 | |
| 210 | // check number format |
| 211 | uint8_t nibbles[2]; |
| 212 | nibbles[0] = (nibble & 0xf0) >> 8; |
| 213 | nibbles[1] = (nibble & 0x0f); |
| 214 | for (unsigned i = 0; i < 2; ++i) { |
| 215 | if (nibbles[i] == 0xd) { // reserved number |
| 216 | return OTS_FAILURE(); |
| 217 | } |
| 218 | if ((nibbles[i] == 0xe) && // minus |
| 219 | ((count > 0) || (i > 0))) { |
| 220 | return OTS_FAILURE(); // minus sign should be the first character. |
| 221 | } |
| 222 | if (nibbles[i] == 0xa) { // decimal point |
| 223 | if (!read_decimal_point) { |
| 224 | read_decimal_point = true; |
| 225 | } else { |
| 226 | return OTS_FAILURE(); // two or more points. |
| 227 | } |
| 228 | } |
| 229 | if ((nibbles[i] == 0xb) || // E+ |
| 230 | (nibbles[i] == 0xc)) { // E- |
| 231 | if (!read_e) { |
| 232 | read_e = true; |
| 233 | } else { |
| 234 | return OTS_FAILURE(); // two or more E's. |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | ++count; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | bool ParseDictDataEscapedOperator( |
| 243 | ots::Buffer *table, |
| 244 | std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| 245 | uint8_t op = 0; |
| 246 | if (!table->ReadU8(&op)) { |
| 247 | return OTS_FAILURE(); |
| 248 | } |
| 249 | |
| 250 | if ((op <= 14) || |
| 251 | (op >= 17 && op <= 23) || |
| 252 | (op >= 30 && op <= 38)) { |
| 253 | operands->push_back(std::make_pair((12U << 8) + op, DICT_OPERATOR)); |
| 254 | return true; |
| 255 | } |
| 256 | |
| 257 | // reserved area. |
| 258 | return OTS_FAILURE(); |
| 259 | } |
| 260 | |
| 261 | bool ParseDictDataNumber( |
| 262 | ots::Buffer *table, uint8_t b0, |
| 263 | std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| 264 | uint8_t b1 = 0; |
| 265 | uint8_t b2 = 0; |
| 266 | uint8_t b3 = 0; |
| 267 | uint8_t b4 = 0; |
| 268 | |
| 269 | switch (b0) { |
| 270 | case 28: // shortint |
| 271 | if (!table->ReadU8(&b1) || |
| 272 | !table->ReadU8(&b2)) { |
| 273 | return OTS_FAILURE(); |
| 274 | } |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 275 | operands->push_back(std::make_pair( |
| 276 | static_cast<uint32_t>((b1 << 8) + b2), DICT_OPERAND_INTEGER)); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 277 | return true; |
| 278 | |
| 279 | case 29: // longint |
| 280 | if (!table->ReadU8(&b1) || |
| 281 | !table->ReadU8(&b2) || |
| 282 | !table->ReadU8(&b3) || |
| 283 | !table->ReadU8(&b4)) { |
| 284 | return OTS_FAILURE(); |
| 285 | } |
| 286 | operands->push_back(std::make_pair( |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 287 | static_cast<uint32_t>((b1 << 24) + (b2 << 16) + (b3 << 8) + b4), |
| 288 | DICT_OPERAND_INTEGER)); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 289 | return true; |
| 290 | |
| 291 | case 30: // binary coded decimal |
| 292 | return ParseDictDataBcd(table, operands); |
| 293 | |
| 294 | default: |
| 295 | break; |
| 296 | } |
| 297 | |
| 298 | uint32_t result; |
| 299 | if (b0 >=32 && b0 <=246) { |
| 300 | result = b0 - 139; |
| 301 | } else if (b0 >=247 && b0 <= 250) { |
| 302 | if (!table->ReadU8(&b1)) { |
| 303 | return OTS_FAILURE(); |
| 304 | } |
| 305 | result = (b0 - 247) * 256 + b1 + 108; |
| 306 | } else if (b0 >= 251 && b0 <= 254) { |
| 307 | if (!table->ReadU8(&b1)) { |
| 308 | return OTS_FAILURE(); |
| 309 | } |
| 310 | result = -(b0 - 251) * 256 + b1 - 108; |
| 311 | } else { |
| 312 | return OTS_FAILURE(); |
| 313 | } |
| 314 | |
| 315 | operands->push_back(std::make_pair(result, DICT_OPERAND_INTEGER)); |
| 316 | return true; |
| 317 | } |
| 318 | |
| 319 | bool ParseDictDataReadNext( |
| 320 | ots::Buffer *table, |
| 321 | std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| 322 | uint8_t op = 0; |
| 323 | if (!table->ReadU8(&op)) { |
| 324 | return OTS_FAILURE(); |
| 325 | } |
| 326 | if (op <= 21) { |
| 327 | if (op == 12) { |
| 328 | return ParseDictDataEscapedOperator(table, operands); |
| 329 | } |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 330 | operands->push_back(std::make_pair( |
| 331 | static_cast<uint32_t>(op), DICT_OPERATOR)); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 332 | return true; |
| 333 | } else if (op <= 27 || op == 31 || op == 255) { |
| 334 | // reserved area. |
| 335 | return OTS_FAILURE(); |
| 336 | } |
| 337 | |
| 338 | return ParseDictDataNumber(table, op, operands); |
| 339 | } |
| 340 | |
| 341 | bool ParsePrivateDictData( |
| 342 | const uint8_t *data, |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 343 | size_t table_length, size_t offset, size_t dict_length, |
| 344 | DICT_DATA_TYPE type, ots::OpenTypeCFF *out_cff) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 345 | ots::Buffer table(data + offset, dict_length); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 346 | std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > operands; |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 347 | |
| 348 | // Since a Private DICT for FDArray might not have a Local Subr (e.g. Hiragino |
| 349 | // Kaku Gothic Std W8), we create an empty Local Subr here to match the size |
| 350 | // of FDArray the size of |local_subrs_per_font|. |
| 351 | if (type == DICT_DATA_FDARRAY) { |
| 352 | out_cff->local_subrs_per_font.push_back(new ots::CFFIndex); |
| 353 | } |
| 354 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 355 | while (table.offset() < dict_length) { |
| 356 | if (!ParseDictDataReadNext(&table, &operands)) { |
| 357 | return OTS_FAILURE(); |
| 358 | } |
| 359 | if (operands.empty()) { |
| 360 | return OTS_FAILURE(); |
| 361 | } |
| 362 | if (operands.size() > 48) { |
| 363 | // An operator may be preceded by up to a maximum of 48 operands. |
| 364 | return OTS_FAILURE(); |
| 365 | } |
| 366 | if (operands.back().second != DICT_OPERATOR) { |
| 367 | continue; |
| 368 | } |
| 369 | |
| 370 | // got operator |
| 371 | const uint32_t op = operands.back().first; |
| 372 | operands.pop_back(); |
| 373 | |
| 374 | switch (op) { |
| 375 | // array |
| 376 | case 6: // BlueValues |
| 377 | case 7: // OtherBlues |
| 378 | case 8: // FamilyBlues |
| 379 | case 9: // FamilyOtherBlues |
| 380 | case (12U << 8) + 12: // StemSnapH (delta) |
| 381 | case (12U << 8) + 13: // StemSnapV (delta) |
| 382 | if (operands.empty()) { |
| 383 | return OTS_FAILURE(); |
| 384 | } |
| 385 | break; |
| 386 | |
| 387 | // number |
| 388 | case 10: // StdHW |
| 389 | case 11: // StdVW |
| 390 | case 20: // defaultWidthX |
| 391 | case 21: // nominalWidthX |
| 392 | case (12U << 8) + 9: // BlueScale |
| 393 | case (12U << 8) + 10: // BlueShift |
| 394 | case (12U << 8) + 11: // BlueFuzz |
| 395 | case (12U << 8) + 17: // LanguageGroup |
| 396 | case (12U << 8) + 18: // ExpansionFactor |
| 397 | case (12U << 8) + 19: // initialRandomSeed |
| 398 | if (operands.size() != 1) { |
| 399 | return OTS_FAILURE(); |
| 400 | } |
| 401 | break; |
| 402 | |
| 403 | // Local Subrs INDEX, offset(self) |
| 404 | case 19: { |
| 405 | if (operands.size() != 1) { |
| 406 | return OTS_FAILURE(); |
| 407 | } |
| 408 | if (operands.back().second != DICT_OPERAND_INTEGER) { |
| 409 | return OTS_FAILURE(); |
| 410 | } |
| 411 | if (operands.back().first >= 1024 * 1024 * 1024) { |
| 412 | return OTS_FAILURE(); |
| 413 | } |
| 414 | if (operands.back().first + offset >= table_length) { |
| 415 | return OTS_FAILURE(); |
| 416 | } |
| 417 | // parse "16. Local Subrs INDEX" |
| 418 | ots::Buffer table(data, table_length); |
| 419 | table.set_offset(operands.back().first + offset); |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 420 | ots::CFFIndex *local_subrs_index = NULL; |
| 421 | if (type == DICT_DATA_FDARRAY) { |
| 422 | if (out_cff->local_subrs_per_font.empty()) { |
| 423 | return OTS_FAILURE(); // not reached. |
| 424 | } |
| 425 | local_subrs_index = out_cff->local_subrs_per_font.back(); |
bashi@chromium.org | 30b3581 | 2012-03-21 05:37:02 +0000 | [diff] [blame] | 426 | } else { // type == DICT_DATA_TOPLEVEL |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 427 | if (out_cff->local_subrs) { |
| 428 | return OTS_FAILURE(); // two or more local_subrs? |
| 429 | } |
| 430 | local_subrs_index = new ots::CFFIndex; |
| 431 | out_cff->local_subrs = local_subrs_index; |
| 432 | } |
| 433 | if (!ParseIndex(&table, local_subrs_index)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 434 | return OTS_FAILURE(); |
| 435 | } |
| 436 | break; |
| 437 | } |
| 438 | |
| 439 | // boolean |
| 440 | case (12U << 8) + 14: // ForceBold |
| 441 | if (operands.size() != 1) { |
| 442 | return OTS_FAILURE(); |
| 443 | } |
| 444 | if (operands.back().second != DICT_OPERAND_INTEGER) { |
| 445 | return OTS_FAILURE(); |
| 446 | } |
| 447 | if (operands.back().first >= 2) { |
| 448 | return OTS_FAILURE(); |
| 449 | } |
| 450 | break; |
| 451 | |
| 452 | default: |
| 453 | return OTS_FAILURE(); |
| 454 | } |
| 455 | operands.clear(); |
| 456 | } |
| 457 | |
| 458 | return true; |
| 459 | } |
| 460 | |
| 461 | bool ParseDictData(const uint8_t *data, size_t table_length, |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 462 | const ots::CFFIndex &index, size_t sid_max, |
| 463 | DICT_DATA_TYPE type, ots::OpenTypeCFF *out_cff) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 464 | for (unsigned i = 1; i < index.offsets.size(); ++i) { |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 465 | if (type == DICT_DATA_TOPLEVEL) { |
| 466 | out_cff->char_strings_array.push_back(new ots::CFFIndex); |
| 467 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 468 | size_t dict_length = index.offsets[i] - index.offsets[i - 1]; |
| 469 | ots::Buffer table(data + index.offsets[i - 1], dict_length); |
| 470 | |
| 471 | std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > operands; |
| 472 | |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 473 | FONT_FORMAT font_format = FORMAT_UNKNOWN; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 474 | bool have_ros = false; |
| 475 | size_t glyphs = 0; |
| 476 | size_t charset_offset = 0; |
| 477 | |
| 478 | while (table.offset() < dict_length) { |
| 479 | if (!ParseDictDataReadNext(&table, &operands)) { |
| 480 | return OTS_FAILURE(); |
| 481 | } |
| 482 | if (operands.empty()) { |
| 483 | return OTS_FAILURE(); |
| 484 | } |
| 485 | if (operands.size() > 48) { |
| 486 | // An operator may be preceded by up to a maximum of 48 operands. |
| 487 | return OTS_FAILURE(); |
| 488 | } |
| 489 | if (operands.back().second != DICT_OPERATOR) continue; |
| 490 | |
| 491 | // got operator |
| 492 | const uint32_t op = operands.back().first; |
| 493 | operands.pop_back(); |
| 494 | |
| 495 | switch (op) { |
| 496 | // SID |
| 497 | case 0: // version |
| 498 | case 1: // Notice |
| 499 | case 2: // Copyright |
| 500 | case 3: // FullName |
| 501 | case 4: // FamilyName |
| 502 | case (12U << 8) + 0: // Copyright |
| 503 | case (12U << 8) + 21: // PostScript |
| 504 | case (12U << 8) + 22: // BaseFontName |
| 505 | case (12U << 8) + 38: // FontName |
| 506 | if (operands.size() != 1) { |
| 507 | return OTS_FAILURE(); |
| 508 | } |
| 509 | if (!CheckSid(operands.back(), sid_max)) { |
| 510 | return OTS_FAILURE(); |
| 511 | } |
| 512 | break; |
| 513 | |
| 514 | // array |
| 515 | case 5: // FontBBox |
| 516 | case 14: // XUID |
| 517 | case (12U << 8) + 7: // FontMatrix |
| 518 | case (12U << 8) + 23: // BaseFontBlend (delta) |
| 519 | if (operands.empty()) { |
| 520 | return OTS_FAILURE(); |
| 521 | } |
| 522 | break; |
| 523 | |
| 524 | // number |
| 525 | case 13: // UniqueID |
| 526 | case (12U << 8) + 2: // ItalicAngle |
| 527 | case (12U << 8) + 3: // UnderlinePosition |
| 528 | case (12U << 8) + 4: // UnderlineThickness |
| 529 | case (12U << 8) + 5: // PaintType |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 530 | case (12U << 8) + 8: // StrokeWidth |
| 531 | case (12U << 8) + 20: // SyntheticBase |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 532 | if (operands.size() != 1) { |
| 533 | return OTS_FAILURE(); |
| 534 | } |
| 535 | break; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 536 | case (12U << 8) + 31: // CIDFontVersion |
| 537 | case (12U << 8) + 32: // CIDFontRevision |
| 538 | case (12U << 8) + 33: // CIDFontType |
| 539 | case (12U << 8) + 34: // CIDCount |
| 540 | case (12U << 8) + 35: // UIDBase |
| 541 | if (operands.size() != 1) { |
| 542 | return OTS_FAILURE(); |
| 543 | } |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 544 | if (font_format != FORMAT_CID_KEYED) { |
| 545 | return OTS_FAILURE(); |
| 546 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 547 | break; |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 548 | case (12U << 8) + 6: // CharstringType |
| 549 | if (operands.size() != 1) { |
| 550 | return OTS_FAILURE(); |
| 551 | } |
| 552 | if(operands.back().second != DICT_OPERAND_INTEGER) { |
| 553 | return OTS_FAILURE(); |
| 554 | } |
| 555 | if (operands.back().first != 2) { |
| 556 | // We only support the "Type 2 Charstring Format." |
| 557 | // TODO(yusukes): Support Type 1 format? Is that still in use? |
| 558 | return OTS_FAILURE(); |
| 559 | } |
| 560 | break; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 561 | |
| 562 | // boolean |
| 563 | case (12U << 8) + 1: // isFixedPitch |
| 564 | if (operands.size() != 1) { |
| 565 | return OTS_FAILURE(); |
| 566 | } |
| 567 | if (operands.back().second != DICT_OPERAND_INTEGER) { |
| 568 | return OTS_FAILURE(); |
| 569 | } |
| 570 | if (operands.back().first >= 2) { |
| 571 | return OTS_FAILURE(); |
| 572 | } |
| 573 | break; |
| 574 | |
| 575 | // offset(0) |
| 576 | case 15: // charset |
| 577 | if (operands.size() != 1) { |
| 578 | return OTS_FAILURE(); |
| 579 | } |
| 580 | if (operands.back().first <= 2) { |
| 581 | // predefined charset, ISOAdobe, Expert or ExpertSubset, is used. |
| 582 | break; |
| 583 | } |
| 584 | if (!CheckOffset(operands.back(), table_length)) { |
| 585 | return OTS_FAILURE(); |
| 586 | } |
| 587 | if (charset_offset) { |
| 588 | return OTS_FAILURE(); // multiple charset tables? |
| 589 | } |
| 590 | charset_offset = operands.back().first; |
| 591 | break; |
| 592 | |
| 593 | case 16: { // Encoding |
| 594 | if (operands.size() != 1) { |
| 595 | return OTS_FAILURE(); |
| 596 | } |
| 597 | if (operands.back().first <= 1) { |
| 598 | break; // predefined encoding, "Standard" or "Expert", is used. |
| 599 | } |
| 600 | if (!CheckOffset(operands.back(), table_length)) { |
| 601 | return OTS_FAILURE(); |
| 602 | } |
| 603 | |
| 604 | // parse sub dictionary INDEX. |
| 605 | ots::Buffer table(data, table_length); |
| 606 | table.set_offset(operands.back().first); |
| 607 | uint8_t format = 0; |
| 608 | if (!table.ReadU8(&format)) { |
| 609 | return OTS_FAILURE(); |
| 610 | } |
| 611 | if (format & 0x80) { |
| 612 | // supplemental encoding is not supported at the moment. |
| 613 | return OTS_FAILURE(); |
| 614 | } |
| 615 | // TODO(yusukes): support & parse supplemental encoding tables. |
| 616 | break; |
| 617 | } |
| 618 | |
| 619 | case 17: { // CharStrings |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 620 | if (type != DICT_DATA_TOPLEVEL) { |
| 621 | return OTS_FAILURE(); |
| 622 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 623 | if (operands.size() != 1) { |
| 624 | return OTS_FAILURE(); |
| 625 | } |
| 626 | if (!CheckOffset(operands.back(), table_length)) { |
| 627 | return OTS_FAILURE(); |
| 628 | } |
| 629 | // parse "14. CharStrings INDEX" |
| 630 | ots::Buffer table(data, table_length); |
| 631 | table.set_offset(operands.back().first); |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 632 | ots::CFFIndex *charstring_index = out_cff->char_strings_array.back(); |
| 633 | if (!ParseIndex(&table, charstring_index)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 634 | return OTS_FAILURE(); |
| 635 | } |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 636 | if (charstring_index->count < 2) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 637 | return OTS_FAILURE(); |
| 638 | } |
| 639 | if (glyphs) { |
| 640 | return OTS_FAILURE(); // multiple charstring tables? |
| 641 | } |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 642 | glyphs = charstring_index->count; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 643 | break; |
| 644 | } |
| 645 | |
| 646 | case (12U << 8) + 36: { // FDArray |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 647 | if (type != DICT_DATA_TOPLEVEL) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 648 | return OTS_FAILURE(); |
| 649 | } |
| 650 | if (operands.size() != 1) { |
| 651 | return OTS_FAILURE(); |
| 652 | } |
| 653 | if (!CheckOffset(operands.back(), table_length)) { |
| 654 | return OTS_FAILURE(); |
| 655 | } |
| 656 | |
| 657 | // parse sub dictionary INDEX. |
| 658 | ots::Buffer table(data, table_length); |
| 659 | table.set_offset(operands.back().first); |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 660 | ots::CFFIndex sub_dict_index; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 661 | if (!ParseIndex(&table, &sub_dict_index)) { |
| 662 | return OTS_FAILURE(); |
| 663 | } |
| 664 | if (!ParseDictData(data, table_length, |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 665 | sub_dict_index, sid_max, DICT_DATA_FDARRAY, |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 666 | out_cff)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 667 | return OTS_FAILURE(); |
| 668 | } |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 669 | if (out_cff->font_dict_length != 0) { |
| 670 | return OTS_FAILURE(); // two or more FDArray found. |
| 671 | } |
| 672 | out_cff->font_dict_length = sub_dict_index.count; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 673 | break; |
| 674 | } |
| 675 | |
| 676 | case (12U << 8) + 37: { // FDSelect |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 677 | if (type != DICT_DATA_TOPLEVEL) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 678 | return OTS_FAILURE(); |
| 679 | } |
| 680 | if (operands.size() != 1) { |
| 681 | return OTS_FAILURE(); |
| 682 | } |
| 683 | if (!CheckOffset(operands.back(), table_length)) { |
| 684 | return OTS_FAILURE(); |
| 685 | } |
| 686 | |
| 687 | // parse FDSelect data structure |
| 688 | ots::Buffer table(data, table_length); |
| 689 | table.set_offset(operands.back().first); |
| 690 | uint8_t format = 0; |
| 691 | if (!table.ReadU8(&format)) { |
| 692 | return OTS_FAILURE(); |
| 693 | } |
| 694 | if (format == 0) { |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 695 | for (size_t j = 0; j < glyphs; ++j) { |
| 696 | uint8_t fd_index = 0; |
| 697 | if (!table.ReadU8(&fd_index)) { |
| 698 | return OTS_FAILURE(); |
| 699 | } |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 700 | (out_cff->fd_select)[j] = fd_index; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 701 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 702 | } else if (format == 3) { |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 703 | uint16_t n_ranges = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 704 | if (!table.ReadU16(&n_ranges)) { |
| 705 | return OTS_FAILURE(); |
| 706 | } |
| 707 | if (n_ranges == 0) { |
| 708 | return OTS_FAILURE(); |
| 709 | } |
| 710 | |
| 711 | uint16_t last_gid = 0; |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 712 | uint8_t fd_index = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 713 | for (unsigned j = 0; j < n_ranges; ++j) { |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 714 | uint16_t first = 0; // GID |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 715 | if (!table.ReadU16(&first)) { |
| 716 | return OTS_FAILURE(); |
| 717 | } |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 718 | |
| 719 | // Sanity checks. |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 720 | if ((j == 0) && (first != 0)) { |
| 721 | return OTS_FAILURE(); |
| 722 | } |
| 723 | if ((j != 0) && (last_gid >= first)) { |
| 724 | return OTS_FAILURE(); // not increasing order. |
| 725 | } |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 726 | |
| 727 | // Copy the mapping to |out_cff->fd_select|. |
| 728 | if (j != 0) { |
| 729 | for (uint16_t k = last_gid; k < first; ++k) { |
| 730 | if (!out_cff->fd_select.insert( |
| 731 | std::make_pair(k, fd_index)).second) { |
| 732 | return OTS_FAILURE(); |
| 733 | } |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | if (!table.ReadU8(&fd_index)) { |
| 738 | return OTS_FAILURE(); |
| 739 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 740 | last_gid = first; |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 741 | // TODO(yusukes): check GID? |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 742 | } |
agl@chromium.org | a0cb1e7 | 2010-04-27 18:37:36 +0000 | [diff] [blame] | 743 | uint16_t sentinel = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 744 | if (!table.ReadU16(&sentinel)) { |
| 745 | return OTS_FAILURE(); |
| 746 | } |
| 747 | if (last_gid >= sentinel) { |
| 748 | return OTS_FAILURE(); |
| 749 | } |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 750 | for (uint16_t k = last_gid; k < sentinel; ++k) { |
| 751 | if (!out_cff->fd_select.insert( |
| 752 | std::make_pair(k, fd_index)).second) { |
| 753 | return OTS_FAILURE(); |
| 754 | } |
| 755 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 756 | } else { |
| 757 | // unknown format |
| 758 | return OTS_FAILURE(); |
| 759 | } |
| 760 | break; |
| 761 | } |
| 762 | |
| 763 | // Private DICT (2 * number) |
| 764 | case 18: { |
| 765 | if (operands.size() != 2) { |
| 766 | return OTS_FAILURE(); |
| 767 | } |
| 768 | if (operands.back().second != DICT_OPERAND_INTEGER) { |
| 769 | return OTS_FAILURE(); |
| 770 | } |
| 771 | const uint32_t private_offset = operands.back().first; |
| 772 | operands.pop_back(); |
| 773 | if (operands.back().second != DICT_OPERAND_INTEGER) { |
| 774 | return OTS_FAILURE(); |
| 775 | } |
| 776 | const uint32_t private_length = operands.back().first; |
bashi@chromium.org | d27e4d2 | 2012-02-23 23:36:04 +0000 | [diff] [blame] | 777 | if (private_offset > table_length) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 778 | return OTS_FAILURE(); |
| 779 | } |
| 780 | if (private_length >= table_length) { |
| 781 | return OTS_FAILURE(); |
| 782 | } |
| 783 | if (private_length + private_offset > table_length) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 784 | return OTS_FAILURE(); |
| 785 | } |
| 786 | // parse "15. Private DICT Data" |
| 787 | if (!ParsePrivateDictData(data, table_length, |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 788 | private_offset, private_length, |
| 789 | type, out_cff)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 790 | return OTS_FAILURE(); |
| 791 | } |
| 792 | break; |
| 793 | } |
| 794 | |
| 795 | // ROS |
| 796 | case (12U << 8) + 30: |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 797 | if (font_format != FORMAT_UNKNOWN) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 798 | return OTS_FAILURE(); |
| 799 | } |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 800 | font_format = FORMAT_CID_KEYED; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 801 | if (operands.size() != 3) { |
| 802 | return OTS_FAILURE(); |
| 803 | } |
| 804 | // check SIDs |
| 805 | operands.pop_back(); // ignore the first number. |
| 806 | if (!CheckSid(operands.back(), sid_max)) { |
| 807 | return OTS_FAILURE(); |
| 808 | } |
| 809 | operands.pop_back(); |
| 810 | if (!CheckSid(operands.back(), sid_max)) { |
| 811 | return OTS_FAILURE(); |
| 812 | } |
| 813 | if (have_ros) { |
| 814 | return OTS_FAILURE(); // multiple ROS tables? |
| 815 | } |
| 816 | have_ros = true; |
| 817 | break; |
| 818 | |
| 819 | default: |
| 820 | return OTS_FAILURE(); |
| 821 | } |
| 822 | operands.clear(); |
bashi@chromium.org | 1650757 | 2012-04-03 08:11:30 +0000 | [diff] [blame] | 823 | |
| 824 | if (font_format == FORMAT_UNKNOWN) { |
| 825 | font_format = FORMAT_OTHER; |
| 826 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | // parse "13. Charsets" |
| 830 | if (charset_offset) { |
| 831 | ots::Buffer table(data, table_length); |
| 832 | table.set_offset(charset_offset); |
| 833 | uint8_t format = 0; |
| 834 | if (!table.ReadU8(&format)) { |
| 835 | return OTS_FAILURE(); |
| 836 | } |
| 837 | switch (format) { |
| 838 | case 0: |
| 839 | for (unsigned j = 1 /* .notdef is omitted */; j < glyphs; ++j) { |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 840 | uint16_t sid = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 841 | if (!table.ReadU16(&sid)) { |
| 842 | return OTS_FAILURE(); |
| 843 | } |
| 844 | if (!have_ros && (sid > sid_max)) { |
| 845 | return OTS_FAILURE(); |
| 846 | } |
| 847 | // TODO(yusukes): check CIDs when have_ros is true. |
| 848 | } |
| 849 | break; |
| 850 | |
| 851 | case 1: |
| 852 | case 2: { |
| 853 | uint32_t total = 1; // .notdef is omitted. |
| 854 | while (total < glyphs) { |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 855 | uint16_t sid = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 856 | if (!table.ReadU16(&sid)) { |
| 857 | return OTS_FAILURE(); |
| 858 | } |
| 859 | if (!have_ros && (sid > sid_max)) { |
| 860 | return OTS_FAILURE(); |
| 861 | } |
| 862 | // TODO(yusukes): check CIDs when have_ros is true. |
| 863 | |
| 864 | if (format == 1) { |
| 865 | uint8_t left = 0; |
| 866 | if (!table.ReadU8(&left)) { |
| 867 | return OTS_FAILURE(); |
| 868 | } |
| 869 | total += (left + 1); |
| 870 | } else { |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 871 | uint16_t left = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 872 | if (!table.ReadU16(&left)) { |
| 873 | return OTS_FAILURE(); |
| 874 | } |
| 875 | total += (left + 1); |
| 876 | } |
| 877 | } |
| 878 | break; |
| 879 | } |
| 880 | |
| 881 | default: |
| 882 | return OTS_FAILURE(); |
| 883 | } |
| 884 | } |
| 885 | } |
| 886 | return true; |
| 887 | } |
| 888 | |
| 889 | } // namespace |
| 890 | |
| 891 | namespace ots { |
| 892 | |
| 893 | bool ots_cff_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { |
| 894 | Buffer table(data, length); |
| 895 | |
| 896 | file->cff = new OpenTypeCFF; |
| 897 | file->cff->data = data; |
| 898 | file->cff->length = length; |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 899 | file->cff->font_dict_length = 0; |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 900 | file->cff->local_subrs = NULL; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 901 | |
| 902 | // parse "6. Header" in the Adobe Compact Font Format Specification |
| 903 | uint8_t major = 0; |
| 904 | uint8_t minor = 0; |
| 905 | uint8_t hdr_size = 0; |
| 906 | uint8_t off_size = 0; |
| 907 | if (!table.ReadU8(&major)) { |
| 908 | return OTS_FAILURE(); |
| 909 | } |
| 910 | if (!table.ReadU8(&minor)) { |
| 911 | return OTS_FAILURE(); |
| 912 | } |
| 913 | if (!table.ReadU8(&hdr_size)) { |
| 914 | return OTS_FAILURE(); |
| 915 | } |
| 916 | if (!table.ReadU8(&off_size)) { |
| 917 | return OTS_FAILURE(); |
| 918 | } |
agl@chromium.org | 88b76fb | 2010-07-14 18:09:01 +0000 | [diff] [blame] | 919 | if ((off_size == 0) || (off_size > 4)) { |
| 920 | return OTS_FAILURE(); |
| 921 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 922 | |
| 923 | if ((major != 1) || |
| 924 | (minor != 0) || |
| 925 | (hdr_size != 4)) { |
| 926 | return OTS_FAILURE(); |
| 927 | } |
| 928 | if (hdr_size >= length) { |
| 929 | return OTS_FAILURE(); |
| 930 | } |
| 931 | |
| 932 | // parse "7. Name INDEX" |
| 933 | table.set_offset(hdr_size); |
| 934 | CFFIndex name_index; |
| 935 | if (!ParseIndex(&table, &name_index)) { |
| 936 | return OTS_FAILURE(); |
| 937 | } |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 938 | if (!ParseNameData(&table, name_index, &(file->cff->name))) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 939 | return OTS_FAILURE(); |
| 940 | } |
| 941 | |
| 942 | // parse "8. Top DICT INDEX" |
yusukes@chromium.org | 0b9ec83 | 2009-11-23 09:59:05 +0000 | [diff] [blame] | 943 | table.set_offset(name_index.offset_to_next); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 944 | CFFIndex top_dict_index; |
| 945 | if (!ParseIndex(&table, &top_dict_index)) { |
| 946 | return OTS_FAILURE(); |
| 947 | } |
| 948 | if (name_index.count != top_dict_index.count) { |
| 949 | return OTS_FAILURE(); |
| 950 | } |
| 951 | |
| 952 | // parse "10. String INDEX" |
yusukes@chromium.org | 0b9ec83 | 2009-11-23 09:59:05 +0000 | [diff] [blame] | 953 | table.set_offset(top_dict_index.offset_to_next); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 954 | CFFIndex string_index; |
| 955 | if (!ParseIndex(&table, &string_index)) { |
| 956 | return OTS_FAILURE(); |
| 957 | } |
| 958 | if (string_index.count >= 65000 - kNStdString) { |
| 959 | return OTS_FAILURE(); |
| 960 | } |
| 961 | |
| 962 | const size_t sid_max = string_index.count + kNStdString; |
| 963 | // string_index.count == 0 is allowed. |
| 964 | |
| 965 | // parse "9. Top DICT Data" |
| 966 | if (!ParseDictData(data, length, top_dict_index, |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 967 | sid_max, DICT_DATA_TOPLEVEL, file->cff)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 968 | return OTS_FAILURE(); |
| 969 | } |
| 970 | |
| 971 | // parse "16. Global Subrs INDEX" |
yusukes@chromium.org | 0b9ec83 | 2009-11-23 09:59:05 +0000 | [diff] [blame] | 972 | table.set_offset(string_index.offset_to_next); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 973 | CFFIndex global_subrs_index; |
| 974 | if (!ParseIndex(&table, &global_subrs_index)) { |
| 975 | return OTS_FAILURE(); |
| 976 | } |
| 977 | |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 978 | // Check if all fd_index in FDSelect are valid. |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 979 | std::map<uint16_t, uint8_t>::const_iterator iter; |
| 980 | std::map<uint16_t, uint8_t>::const_iterator end = file->cff->fd_select.end(); |
| 981 | for (iter = file->cff->fd_select.begin(); iter != end; ++iter) { |
| 982 | if (iter->second >= file->cff->font_dict_length) { |
| 983 | return OTS_FAILURE(); |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | // Check if all charstrings (font hinting code for each glyph) are valid. |
| 988 | for (size_t i = 0; i < file->cff->char_strings_array.size(); ++i) { |
| 989 | if (!ValidateType2CharStringIndex(*(file->cff->char_strings_array.at(i)), |
| 990 | global_subrs_index, |
| 991 | file->cff->fd_select, |
| 992 | file->cff->local_subrs_per_font, |
| 993 | file->cff->local_subrs, |
| 994 | &table)) { |
yusukes@chromium.org | edfb130 | 2010-07-15 06:03:02 +0000 | [diff] [blame] | 995 | return OTS_FAILURE(); |
| 996 | } |
| 997 | } |
| 998 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 999 | return true; |
| 1000 | } |
| 1001 | |
| 1002 | bool ots_cff_should_serialise(OpenTypeFile *file) { |
agl@chromium.org | 2beaf1d | 2011-01-21 17:19:34 +0000 | [diff] [blame] | 1003 | return file->cff != NULL; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | bool ots_cff_serialise(OTSStream *out, OpenTypeFile *file) { |
| 1007 | // TODO(yusukes): would be better to transcode the data, |
| 1008 | // rather than simple memcpy. |
| 1009 | if (!out->Write(file->cff->data, file->cff->length)) { |
| 1010 | return OTS_FAILURE(); |
| 1011 | } |
| 1012 | return true; |
| 1013 | } |
| 1014 | |
| 1015 | void ots_cff_free(OpenTypeFile *file) { |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 1016 | if (file->cff) { |
| 1017 | for (size_t i = 0; i < file->cff->char_strings_array.size(); ++i) { |
| 1018 | delete (file->cff->char_strings_array)[i]; |
| 1019 | } |
| 1020 | for (size_t i = 0; i < file->cff->local_subrs_per_font.size(); ++i) { |
| 1021 | delete (file->cff->local_subrs_per_font)[i]; |
| 1022 | } |
| 1023 | delete file->cff->local_subrs; |
| 1024 | delete file->cff; |
| 1025 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 1026 | } |
| 1027 | |
| 1028 | } // namespace ots |