yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 1 | // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| 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 "cmap.h" |
| 6 | |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 7 | #include <algorithm> |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 8 | #include <set> |
| 9 | #include <utility> |
| 10 | #include <vector> |
| 11 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 12 | #include "maxp.h" |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 13 | #include "os2.h" |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 14 | |
| 15 | // cmap - Character To Glyph Index Mapping Table |
| 16 | // http://www.microsoft.com/opentype/otspec/cmap.htm |
| 17 | |
| 18 | namespace { |
| 19 | |
| 20 | struct CMAPSubtableHeader { |
| 21 | uint16_t platform; |
| 22 | uint16_t encoding; |
| 23 | uint32_t offset; |
| 24 | uint16_t format; |
| 25 | uint32_t length; |
| 26 | }; |
| 27 | |
| 28 | struct Subtable314Range { |
| 29 | uint16_t start_range; |
| 30 | uint16_t end_range; |
| 31 | int16_t id_delta; |
| 32 | uint16_t id_range_offset; |
| 33 | uint32_t id_range_offset_offset; |
| 34 | }; |
| 35 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 36 | // The maximum number of groups in format 12, 13 or 14 subtables. |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 37 | // Note: 0xFFFF is the maximum number of glyphs in a single font file. |
| 38 | const unsigned kMaxCMAPGroups = 0xFFFF; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 39 | |
| 40 | // Glyph array size for the Mac Roman (format 0) table. |
| 41 | const size_t kFormat0ArraySize = 256; |
| 42 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 43 | // The upper limit of the Unicode code point. |
| 44 | const uint32_t kUnicodeUpperLimit = 0x10FFFF; |
| 45 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 46 | // The maximum number of UVS records (See below). |
| 47 | const uint32_t kMaxCMAPSelectorRecords = 259; |
| 48 | // The range of UVSes are: |
| 49 | // 0x180B-0x180D (3 code points) |
| 50 | // 0xFE00-0xFE0F (16 code points) |
| 51 | // 0xE0100-0xE01EF (240 code points) |
| 52 | const uint32_t kMongolianVSStart = 0x180B; |
| 53 | const uint32_t kMongolianVSEnd = 0x180D; |
| 54 | const uint32_t kVSStart = 0xFE00; |
| 55 | const uint32_t kVSEnd = 0xFE0F; |
| 56 | const uint32_t kIVSStart = 0xE0100; |
| 57 | const uint32_t kIVSEnd = 0xE01EF; |
| 58 | const uint32_t kUVSUpperLimit = 0xFFFFFF; |
| 59 | |
| 60 | // Parses Format 4 tables |
| 61 | bool ParseFormat4(ots::OpenTypeFile *file, int platform, int encoding, |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 62 | const uint8_t *data, size_t length, uint16_t num_glyphs) { |
| 63 | ots::Buffer subtable(data, length); |
| 64 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 65 | // 0.3.4, 3.0.4 or 3.1.4 subtables are complex and, rather than expanding the |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 66 | // whole thing and recompacting it, we validate it and include it verbatim |
| 67 | // in the output. |
| 68 | |
| 69 | if (!file->os2) { |
| 70 | return OTS_FAILURE(); |
| 71 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 72 | |
| 73 | if (!subtable.Skip(4)) { |
| 74 | return OTS_FAILURE(); |
| 75 | } |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 76 | uint16_t language = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 77 | if (!subtable.ReadU16(&language)) { |
| 78 | return OTS_FAILURE(); |
| 79 | } |
| 80 | if (language) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 81 | // Platform ID 3 (windows) subtables should have language '0'. |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 82 | return OTS_FAILURE(); |
| 83 | } |
| 84 | |
| 85 | uint16_t segcountx2, search_range, entry_selector, range_shift; |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 86 | segcountx2 = search_range = entry_selector = range_shift = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 87 | if (!subtable.ReadU16(&segcountx2) || |
| 88 | !subtable.ReadU16(&search_range) || |
| 89 | !subtable.ReadU16(&entry_selector) || |
| 90 | !subtable.ReadU16(&range_shift)) { |
| 91 | return OTS_FAILURE(); |
| 92 | } |
| 93 | |
| 94 | if (segcountx2 & 1 || search_range & 1) { |
| 95 | return OTS_FAILURE(); |
| 96 | } |
| 97 | const uint16_t segcount = segcountx2 >> 1; |
| 98 | // There must be at least one segment according the spec. |
| 99 | if (segcount < 1) { |
| 100 | return OTS_FAILURE(); |
| 101 | } |
| 102 | |
| 103 | // log2segcount is the maximal x s.t. 2^x < segcount |
| 104 | unsigned log2segcount = 0; |
| 105 | while (1u << (log2segcount + 1) <= segcount) { |
| 106 | log2segcount++; |
| 107 | } |
| 108 | |
| 109 | const uint16_t expected_search_range = 2 * 1u << log2segcount; |
| 110 | if (expected_search_range != search_range) { |
| 111 | return OTS_FAILURE(); |
| 112 | } |
| 113 | |
| 114 | if (entry_selector != log2segcount) { |
| 115 | return OTS_FAILURE(); |
| 116 | } |
| 117 | |
| 118 | const uint16_t expected_range_shift = segcountx2 - search_range; |
| 119 | if (range_shift != expected_range_shift) { |
| 120 | return OTS_FAILURE(); |
| 121 | } |
| 122 | |
| 123 | std::vector<Subtable314Range> ranges(segcount); |
| 124 | |
| 125 | for (unsigned i = 0; i < segcount; ++i) { |
| 126 | if (!subtable.ReadU16(&ranges[i].end_range)) { |
| 127 | return OTS_FAILURE(); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | uint16_t padding; |
| 132 | if (!subtable.ReadU16(&padding)) { |
| 133 | return OTS_FAILURE(); |
| 134 | } |
| 135 | if (padding) { |
| 136 | return OTS_FAILURE(); |
| 137 | } |
| 138 | |
| 139 | for (unsigned i = 0; i < segcount; ++i) { |
| 140 | if (!subtable.ReadU16(&ranges[i].start_range)) { |
| 141 | return OTS_FAILURE(); |
| 142 | } |
| 143 | } |
| 144 | for (unsigned i = 0; i < segcount; ++i) { |
| 145 | if (!subtable.ReadS16(&ranges[i].id_delta)) { |
| 146 | return OTS_FAILURE(); |
| 147 | } |
| 148 | } |
| 149 | for (unsigned i = 0; i < segcount; ++i) { |
| 150 | ranges[i].id_range_offset_offset = subtable.offset(); |
| 151 | if (!subtable.ReadU16(&ranges[i].id_range_offset)) { |
| 152 | return OTS_FAILURE(); |
| 153 | } |
| 154 | |
| 155 | if (ranges[i].id_range_offset & 1) { |
| 156 | // Some font generators seem to put 65535 on id_range_offset |
| 157 | // for 0xFFFF-0xFFFF range. |
| 158 | // (e.g., many fonts in http://www.princexml.com/fonts/) |
| 159 | if (i == segcount - 1u) { |
| 160 | OTS_WARNING("bad id_range_offset"); |
| 161 | ranges[i].id_range_offset = 0; |
| 162 | // The id_range_offset value in the transcoded font will not change |
| 163 | // since this table is not actually "transcoded" yet. |
| 164 | } else { |
| 165 | return OTS_FAILURE(); |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | // ranges must be ascending order, based on the end_code. Ranges may not |
| 171 | // overlap. |
| 172 | for (unsigned i = 1; i < segcount; ++i) { |
| 173 | if ((i == segcount - 1u) && |
| 174 | (ranges[i - 1].start_range == 0xffff) && |
| 175 | (ranges[i - 1].end_range == 0xffff) && |
| 176 | (ranges[i].start_range == 0xffff) && |
| 177 | (ranges[i].end_range == 0xffff)) { |
| 178 | // Some fonts (e.g., Germania.ttf) have multiple 0xffff terminators. |
| 179 | // We'll accept them as an exception. |
| 180 | OTS_WARNING("multiple 0xffff terminators found"); |
| 181 | continue; |
| 182 | } |
| 183 | |
| 184 | // Note: some Linux fonts (e.g., LucidaSansOblique.ttf, bsmi00lp.ttf) have |
| 185 | // unsorted table... |
| 186 | if (ranges[i].end_range <= ranges[i - 1].end_range) { |
| 187 | return OTS_FAILURE(); |
| 188 | } |
| 189 | if (ranges[i].start_range <= ranges[i - 1].end_range) { |
| 190 | return OTS_FAILURE(); |
| 191 | } |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 192 | |
| 193 | // On many fonts, the value of {first, last}_char_index are incorrect. |
| 194 | // Fix them. |
| 195 | if (file->os2->first_char_index != 0xFFFF && |
| 196 | ranges[i].start_range != 0xFFFF && |
| 197 | file->os2->first_char_index > ranges[i].start_range) { |
| 198 | file->os2->first_char_index = ranges[i].start_range; |
| 199 | } |
| 200 | if (file->os2->last_char_index != 0xFFFF && |
| 201 | ranges[i].end_range != 0xFFFF && |
| 202 | file->os2->last_char_index < ranges[i].end_range) { |
| 203 | file->os2->last_char_index = ranges[i].end_range; |
| 204 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | // The last range must end at 0xffff |
| 208 | if (ranges[segcount - 1].end_range != 0xffff) { |
| 209 | return OTS_FAILURE(); |
| 210 | } |
| 211 | |
| 212 | // A format 4 CMAP subtable is complex. To be safe we simulate a lookup of |
| 213 | // each code-point defined in the table and make sure that they are all valid |
| 214 | // glyphs and that we don't access anything out-of-bounds. |
bashi@chromium.org | 54380c8 | 2012-09-04 04:36:11 +0000 | [diff] [blame] | 215 | for (unsigned i = 0; i < segcount; ++i) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 216 | for (unsigned cp = ranges[i].start_range; cp <= ranges[i].end_range; ++cp) { |
| 217 | const uint16_t code_point = cp; |
| 218 | if (ranges[i].id_range_offset == 0) { |
| 219 | // this is explictly allowed to overflow in the spec |
| 220 | const uint16_t glyph = code_point + ranges[i].id_delta; |
| 221 | if (glyph >= num_glyphs) { |
| 222 | return OTS_FAILURE(); |
| 223 | } |
| 224 | } else { |
| 225 | const uint16_t range_delta = code_point - ranges[i].start_range; |
| 226 | // this might seem odd, but it's true. The offset is relative to the |
| 227 | // location of the offset value itself. |
| 228 | const uint32_t glyph_id_offset = ranges[i].id_range_offset_offset + |
| 229 | ranges[i].id_range_offset + |
| 230 | range_delta * 2; |
| 231 | // We need to be able to access a 16-bit value from this offset |
| 232 | if (glyph_id_offset + 1 >= length) { |
| 233 | return OTS_FAILURE(); |
| 234 | } |
| 235 | uint16_t glyph; |
ksakamoto@chromium.org | 59f812a | 2013-11-01 05:47:23 +0000 | [diff] [blame] | 236 | std::memcpy(&glyph, data + glyph_id_offset, 2); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 237 | glyph = ntohs(glyph); |
| 238 | if (glyph >= num_glyphs) { |
| 239 | return OTS_FAILURE(); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | // We accept the table. |
| 246 | // TODO(yusukes): transcode the subtable. |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 247 | if (platform == 3 && encoding == 0) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 248 | file->cmap->subtable_3_0_4_data = data; |
| 249 | file->cmap->subtable_3_0_4_length = length; |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 250 | } else if (platform == 3 && encoding == 1) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 251 | file->cmap->subtable_3_1_4_data = data; |
| 252 | file->cmap->subtable_3_1_4_length = length; |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 253 | } else if (platform == 0 && encoding == 3) { |
| 254 | file->cmap->subtable_0_3_4_data = data; |
| 255 | file->cmap->subtable_0_3_4_length = length; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 256 | } else { |
| 257 | return OTS_FAILURE(); |
| 258 | } |
| 259 | |
| 260 | return true; |
| 261 | } |
| 262 | |
| 263 | bool Parse31012(ots::OpenTypeFile *file, |
| 264 | const uint8_t *data, size_t length, uint16_t num_glyphs) { |
| 265 | ots::Buffer subtable(data, length); |
| 266 | |
| 267 | // Format 12 tables are simple. We parse these and fully serialise them |
| 268 | // later. |
| 269 | |
| 270 | if (!subtable.Skip(8)) { |
| 271 | return OTS_FAILURE(); |
| 272 | } |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 273 | uint32_t language = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 274 | if (!subtable.ReadU32(&language)) { |
| 275 | return OTS_FAILURE(); |
| 276 | } |
| 277 | if (language) { |
| 278 | return OTS_FAILURE(); |
| 279 | } |
| 280 | |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 281 | uint32_t num_groups = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 282 | if (!subtable.ReadU32(&num_groups)) { |
| 283 | return OTS_FAILURE(); |
| 284 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 285 | if (num_groups == 0 || num_groups > kMaxCMAPGroups) { |
| 286 | return OTS_FAILURE(); |
| 287 | } |
| 288 | |
| 289 | std::vector<ots::OpenTypeCMAPSubtableRange> &groups |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 290 | = file->cmap->subtable_3_10_12; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 291 | groups.resize(num_groups); |
| 292 | |
| 293 | for (unsigned i = 0; i < num_groups; ++i) { |
| 294 | if (!subtable.ReadU32(&groups[i].start_range) || |
| 295 | !subtable.ReadU32(&groups[i].end_range) || |
| 296 | !subtable.ReadU32(&groups[i].start_glyph_id)) { |
| 297 | return OTS_FAILURE(); |
| 298 | } |
| 299 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 300 | if (groups[i].start_range > kUnicodeUpperLimit || |
| 301 | groups[i].end_range > kUnicodeUpperLimit || |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 302 | groups[i].start_glyph_id > 0xFFFF) { |
| 303 | return OTS_FAILURE(); |
| 304 | } |
| 305 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 306 | // [0xD800, 0xDFFF] are surrogate code points. |
| 307 | if (groups[i].start_range >= 0xD800 && |
| 308 | groups[i].start_range <= 0xDFFF) { |
| 309 | return OTS_FAILURE(); |
| 310 | } |
| 311 | if (groups[i].end_range >= 0xD800 && |
| 312 | groups[i].end_range <= 0xDFFF) { |
| 313 | return OTS_FAILURE(); |
| 314 | } |
| 315 | if (groups[i].start_range < 0xD800 && |
| 316 | groups[i].end_range > 0xDFFF) { |
| 317 | return OTS_FAILURE(); |
| 318 | } |
| 319 | |
| 320 | // We assert that the glyph value is within range. Because of the range |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 321 | // limits, above, we don't need to worry about overflow. |
| 322 | if (groups[i].end_range < groups[i].start_range) { |
| 323 | return OTS_FAILURE(); |
| 324 | } |
| 325 | if ((groups[i].end_range - groups[i].start_range) + |
| 326 | groups[i].start_glyph_id > num_glyphs) { |
| 327 | return OTS_FAILURE(); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | // the groups must be sorted by start code and may not overlap |
| 332 | for (unsigned i = 1; i < num_groups; ++i) { |
| 333 | if (groups[i].start_range <= groups[i - 1].start_range) { |
| 334 | return OTS_FAILURE(); |
| 335 | } |
| 336 | if (groups[i].start_range <= groups[i - 1].end_range) { |
| 337 | return OTS_FAILURE(); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | return true; |
| 342 | } |
| 343 | |
| 344 | bool Parse31013(ots::OpenTypeFile *file, |
| 345 | const uint8_t *data, size_t length, uint16_t num_glyphs) { |
| 346 | ots::Buffer subtable(data, length); |
| 347 | |
| 348 | // Format 13 tables are simple. We parse these and fully serialise them |
| 349 | // later. |
| 350 | |
| 351 | if (!subtable.Skip(8)) { |
| 352 | return OTS_FAILURE(); |
| 353 | } |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 354 | uint16_t language = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 355 | if (!subtable.ReadU16(&language)) { |
| 356 | return OTS_FAILURE(); |
| 357 | } |
| 358 | if (language) { |
| 359 | return OTS_FAILURE(); |
| 360 | } |
| 361 | |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 362 | uint32_t num_groups = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 363 | if (!subtable.ReadU32(&num_groups)) { |
| 364 | return OTS_FAILURE(); |
| 365 | } |
| 366 | |
| 367 | // We limit the number of groups in the same way as in 3.10.12 tables. See |
| 368 | // the comment there in |
| 369 | if (num_groups == 0 || num_groups > kMaxCMAPGroups) { |
| 370 | return OTS_FAILURE(); |
| 371 | } |
| 372 | |
| 373 | std::vector<ots::OpenTypeCMAPSubtableRange> &groups |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 374 | = file->cmap->subtable_3_10_13; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 375 | groups.resize(num_groups); |
| 376 | |
| 377 | for (unsigned i = 0; i < num_groups; ++i) { |
| 378 | if (!subtable.ReadU32(&groups[i].start_range) || |
| 379 | !subtable.ReadU32(&groups[i].end_range) || |
| 380 | !subtable.ReadU32(&groups[i].start_glyph_id)) { |
| 381 | return OTS_FAILURE(); |
| 382 | } |
| 383 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 384 | // We conservatively limit all of the values to protect some parsers from |
| 385 | // overflows |
| 386 | if (groups[i].start_range > kUnicodeUpperLimit || |
| 387 | groups[i].end_range > kUnicodeUpperLimit || |
| 388 | groups[i].start_glyph_id > 0xFFFF) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 389 | return OTS_FAILURE(); |
| 390 | } |
| 391 | |
| 392 | if (groups[i].start_glyph_id >= num_glyphs) { |
| 393 | return OTS_FAILURE(); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | // the groups must be sorted by start code and may not overlap |
| 398 | for (unsigned i = 1; i < num_groups; ++i) { |
| 399 | if (groups[i].start_range <= groups[i - 1].start_range) { |
| 400 | return OTS_FAILURE(); |
| 401 | } |
| 402 | if (groups[i].start_range <= groups[i - 1].end_range) { |
| 403 | return OTS_FAILURE(); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | return true; |
| 408 | } |
| 409 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 410 | bool Parse0514(ots::OpenTypeFile *file, |
| 411 | const uint8_t *data, size_t length, uint16_t num_glyphs) { |
| 412 | // Unicode Variation Selector table |
| 413 | ots::Buffer subtable(data, length); |
| 414 | |
| 415 | // Format 14 tables are simple. We parse these and fully serialise them |
| 416 | // later. |
| 417 | |
| 418 | // Skip format (USHORT) and length (ULONG) |
| 419 | if (!subtable.Skip(6)) { |
| 420 | return OTS_FAILURE(); |
| 421 | } |
| 422 | |
| 423 | uint32_t num_records = 0; |
| 424 | if (!subtable.ReadU32(&num_records)) { |
| 425 | return OTS_FAILURE(); |
| 426 | } |
| 427 | if (num_records == 0 || num_records > kMaxCMAPSelectorRecords) { |
| 428 | return OTS_FAILURE(); |
| 429 | } |
| 430 | |
| 431 | std::vector<ots::OpenTypeCMAPSubtableVSRecord>& records |
| 432 | = file->cmap->subtable_0_5_14; |
| 433 | records.resize(num_records); |
| 434 | |
| 435 | for (unsigned i = 0; i < num_records; ++i) { |
| 436 | if (!subtable.ReadU24(&records[i].var_selector) || |
| 437 | !subtable.ReadU32(&records[i].default_offset) || |
| 438 | !subtable.ReadU32(&records[i].non_default_offset)) { |
| 439 | return OTS_FAILURE(); |
| 440 | } |
| 441 | // Checks the value of variation selector |
| 442 | if (!((records[i].var_selector >= kMongolianVSStart && |
| 443 | records[i].var_selector <= kMongolianVSEnd) || |
| 444 | (records[i].var_selector >= kVSStart && |
| 445 | records[i].var_selector <= kVSEnd) || |
| 446 | (records[i].var_selector >= kIVSStart && |
| 447 | records[i].var_selector <= kIVSEnd))) { |
| 448 | return OTS_FAILURE(); |
| 449 | } |
| 450 | if (i > 0 && |
| 451 | records[i-1].var_selector >= records[i].var_selector) { |
| 452 | return OTS_FAILURE(); |
| 453 | } |
| 454 | |
| 455 | // Checks offsets |
| 456 | if (!records[i].default_offset && !records[i].non_default_offset) { |
| 457 | return OTS_FAILURE(); |
| 458 | } |
| 459 | if (records[i].default_offset && |
| 460 | records[i].default_offset >= length) { |
| 461 | return OTS_FAILURE(); |
| 462 | } |
| 463 | if (records[i].non_default_offset && |
| 464 | records[i].non_default_offset >= length) { |
| 465 | return OTS_FAILURE(); |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | for (unsigned i = 0; i < num_records; ++i) { |
| 470 | // Checks default UVS table |
| 471 | if (records[i].default_offset) { |
| 472 | subtable.set_offset(records[i].default_offset); |
| 473 | uint32_t num_ranges = 0; |
| 474 | if (!subtable.ReadU32(&num_ranges)) { |
| 475 | return OTS_FAILURE(); |
| 476 | } |
| 477 | if (!num_ranges || num_ranges > kMaxCMAPGroups) { |
| 478 | return OTS_FAILURE(); |
| 479 | } |
| 480 | |
| 481 | uint32_t last_unicode_value = 0; |
| 482 | std::vector<ots::OpenTypeCMAPSubtableVSRange>& ranges |
| 483 | = records[i].ranges; |
| 484 | ranges.resize(num_ranges); |
| 485 | |
| 486 | for (unsigned j = 0; j < num_ranges; ++j) { |
| 487 | if (!subtable.ReadU24(&ranges[j].unicode_value) || |
| 488 | !subtable.ReadU8(&ranges[j].additional_count)) { |
| 489 | return OTS_FAILURE(); |
| 490 | } |
| 491 | const uint32_t check_value = |
bashi@chromium.org | 26afae8 | 2011-08-25 05:38:57 +0000 | [diff] [blame] | 492 | ranges[j].unicode_value + ranges[j].additional_count; |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 493 | if (ranges[j].unicode_value == 0 || |
| 494 | ranges[j].unicode_value > kUnicodeUpperLimit || |
| 495 | check_value > kUVSUpperLimit || |
| 496 | (last_unicode_value && |
| 497 | ranges[j].unicode_value <= last_unicode_value)) { |
| 498 | return OTS_FAILURE(); |
| 499 | } |
| 500 | last_unicode_value = check_value; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | // Checks non default UVS table |
| 505 | if (records[i].non_default_offset) { |
| 506 | subtable.set_offset(records[i].non_default_offset); |
| 507 | uint32_t num_mappings = 0; |
| 508 | if (!subtable.ReadU32(&num_mappings)) { |
| 509 | return OTS_FAILURE(); |
| 510 | } |
| 511 | if (!num_mappings || num_mappings > kMaxCMAPGroups) { |
| 512 | return OTS_FAILURE(); |
| 513 | } |
| 514 | |
| 515 | uint32_t last_unicode_value = 0; |
| 516 | std::vector<ots::OpenTypeCMAPSubtableVSMapping>& mappings |
| 517 | = records[i].mappings; |
| 518 | mappings.resize(num_mappings); |
| 519 | |
| 520 | for (unsigned j = 0; j < num_mappings; ++j) { |
| 521 | if (!subtable.ReadU24(&mappings[j].unicode_value) || |
| 522 | !subtable.ReadU16(&mappings[j].glyph_id)) { |
| 523 | return OTS_FAILURE(); |
| 524 | } |
| 525 | if (mappings[j].glyph_id == 0 || |
| 526 | mappings[j].unicode_value == 0 || |
| 527 | mappings[j].unicode_value > kUnicodeUpperLimit || |
| 528 | (last_unicode_value && |
| 529 | mappings[j].unicode_value <= last_unicode_value)) { |
| 530 | return OTS_FAILURE(); |
| 531 | } |
| 532 | last_unicode_value = mappings[j].unicode_value; |
| 533 | } |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | if (subtable.offset() != length) { |
| 538 | return OTS_FAILURE(); |
| 539 | } |
| 540 | file->cmap->subtable_0_5_14_length = subtable.offset(); |
| 541 | return true; |
| 542 | } |
| 543 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 544 | bool Parse100(ots::OpenTypeFile *file, const uint8_t *data, size_t length) { |
| 545 | // Mac Roman table |
| 546 | ots::Buffer subtable(data, length); |
| 547 | |
| 548 | if (!subtable.Skip(4)) { |
| 549 | return OTS_FAILURE(); |
| 550 | } |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 551 | uint16_t language = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 552 | if (!subtable.ReadU16(&language)) { |
| 553 | return OTS_FAILURE(); |
| 554 | } |
| 555 | if (language) { |
| 556 | // simsun.ttf has non-zero language id. |
| 557 | OTS_WARNING("language id should be zero: %u", language); |
| 558 | } |
| 559 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 560 | file->cmap->subtable_1_0_0.reserve(kFormat0ArraySize); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 561 | for (size_t i = 0; i < kFormat0ArraySize; ++i) { |
| 562 | uint8_t glyph_id = 0; |
| 563 | if (!subtable.ReadU8(&glyph_id)) { |
| 564 | return OTS_FAILURE(); |
| 565 | } |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 566 | file->cmap->subtable_1_0_0.push_back(glyph_id); |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | return true; |
| 570 | } |
| 571 | |
| 572 | } // namespace |
| 573 | |
| 574 | namespace ots { |
| 575 | |
| 576 | bool ots_cmap_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { |
| 577 | Buffer table(data, length); |
| 578 | file->cmap = new OpenTypeCMAP; |
| 579 | |
yusukes@chromium.org | 8ad0a17 | 2009-11-04 06:07:58 +0000 | [diff] [blame] | 580 | uint16_t version = 0; |
| 581 | uint16_t num_tables = 0; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 582 | if (!table.ReadU16(&version) || |
| 583 | !table.ReadU16(&num_tables)) { |
| 584 | return OTS_FAILURE(); |
| 585 | } |
| 586 | |
| 587 | if (version != 0) { |
| 588 | return OTS_FAILURE(); |
| 589 | } |
| 590 | if (!num_tables) { |
| 591 | return OTS_FAILURE(); |
| 592 | } |
| 593 | |
| 594 | std::vector<CMAPSubtableHeader> subtable_headers; |
| 595 | |
| 596 | // read the subtable headers |
| 597 | subtable_headers.reserve(num_tables); |
| 598 | for (unsigned i = 0; i < num_tables; ++i) { |
| 599 | CMAPSubtableHeader subt; |
| 600 | |
| 601 | if (!table.ReadU16(&subt.platform) || |
| 602 | !table.ReadU16(&subt.encoding) || |
| 603 | !table.ReadU32(&subt.offset)) { |
| 604 | return OTS_FAILURE(); |
| 605 | } |
| 606 | |
| 607 | subtable_headers.push_back(subt); |
| 608 | } |
| 609 | |
| 610 | const size_t data_offset = table.offset(); |
| 611 | |
| 612 | // make sure that all the offsets are valid. |
| 613 | uint32_t last_id = 0; |
| 614 | for (unsigned i = 0; i < num_tables; ++i) { |
| 615 | if (subtable_headers[i].offset > 1024 * 1024 * 1024) { |
| 616 | return OTS_FAILURE(); |
| 617 | } |
| 618 | if (subtable_headers[i].offset < data_offset || |
| 619 | subtable_headers[i].offset >= length) { |
| 620 | return OTS_FAILURE(); |
| 621 | } |
| 622 | |
| 623 | // check if the table is sorted first by platform ID, then by encoding ID. |
| 624 | uint32_t current_id |
| 625 | = (subtable_headers[i].platform << 16) + subtable_headers[i].encoding; |
| 626 | if ((i != 0) && (last_id >= current_id)) { |
| 627 | return OTS_FAILURE(); |
| 628 | } |
| 629 | last_id = current_id; |
| 630 | } |
| 631 | |
| 632 | // the format of the table is the first couple of bytes in the table. The |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 633 | // length of the table is stored in a format-specific way. |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 634 | for (unsigned i = 0; i < num_tables; ++i) { |
| 635 | table.set_offset(subtable_headers[i].offset); |
| 636 | if (!table.ReadU16(&subtable_headers[i].format)) { |
| 637 | return OTS_FAILURE(); |
| 638 | } |
| 639 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 640 | uint16_t len = 0; |
| 641 | switch (subtable_headers[i].format) { |
| 642 | case 0: |
| 643 | case 4: |
| 644 | if (!table.ReadU16(&len)) { |
| 645 | return OTS_FAILURE(); |
| 646 | } |
| 647 | subtable_headers[i].length = len; |
| 648 | break; |
| 649 | case 12: |
| 650 | case 13: |
| 651 | if (!table.Skip(2)) { |
| 652 | return OTS_FAILURE(); |
| 653 | } |
| 654 | if (!table.ReadU32(&subtable_headers[i].length)) { |
| 655 | return OTS_FAILURE(); |
| 656 | } |
| 657 | break; |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 658 | case 14: |
| 659 | if (!table.ReadU32(&subtable_headers[i].length)) { |
| 660 | return OTS_FAILURE(); |
| 661 | } |
| 662 | break; |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 663 | default: |
| 664 | subtable_headers[i].length = 0; |
| 665 | break; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 666 | } |
| 667 | } |
| 668 | |
| 669 | // Now, verify that all the lengths are sane |
| 670 | for (unsigned i = 0; i < num_tables; ++i) { |
| 671 | if (!subtable_headers[i].length) continue; |
| 672 | if (subtable_headers[i].length > 1024 * 1024 * 1024) { |
| 673 | return OTS_FAILURE(); |
| 674 | } |
| 675 | // We know that both the offset and length are < 1GB, so the following |
| 676 | // addition doesn't overflow |
| 677 | const uint32_t end_byte |
| 678 | = subtable_headers[i].offset + subtable_headers[i].length; |
| 679 | if (end_byte > length) { |
| 680 | return OTS_FAILURE(); |
| 681 | } |
| 682 | } |
| 683 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 684 | // check that the cmap subtables are not overlapping. |
| 685 | std::set<std::pair<uint32_t, uint32_t> > uniq_checker; |
| 686 | std::vector<std::pair<uint32_t, uint8_t> > overlap_checker; |
| 687 | for (unsigned i = 0; i < num_tables; ++i) { |
| 688 | const uint32_t end_byte |
| 689 | = subtable_headers[i].offset + subtable_headers[i].length; |
| 690 | |
| 691 | if (!uniq_checker.insert(std::make_pair(subtable_headers[i].offset, |
| 692 | end_byte)).second) { |
| 693 | // Sometimes Unicode table and MS table share exactly the same data. |
| 694 | // We'll allow this. |
| 695 | continue; |
| 696 | } |
| 697 | overlap_checker.push_back( |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 698 | std::make_pair(subtable_headers[i].offset, |
| 699 | static_cast<uint8_t>(1) /* start */)); |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 700 | overlap_checker.push_back( |
bashi@chromium.org | 79602bd | 2011-04-05 20:20:15 +0000 | [diff] [blame] | 701 | std::make_pair(end_byte, static_cast<uint8_t>(0) /* end */)); |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 702 | } |
| 703 | std::sort(overlap_checker.begin(), overlap_checker.end()); |
| 704 | int overlap_count = 0; |
| 705 | for (unsigned i = 0; i < overlap_checker.size(); ++i) { |
| 706 | overlap_count += (overlap_checker[i].second ? 1 : -1); |
| 707 | if (overlap_count > 1) { |
| 708 | return OTS_FAILURE(); |
| 709 | } |
| 710 | } |
| 711 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 712 | // we grab the number of glyphs in the file from the maxp table to make sure |
| 713 | // that the character map isn't referencing anything beyound this range. |
| 714 | if (!file->maxp) { |
| 715 | return OTS_FAILURE(); |
| 716 | } |
| 717 | const uint16_t num_glyphs = file->maxp->num_glyphs; |
| 718 | |
| 719 | // We only support a subset of the possible character map tables. Microsoft |
| 720 | // 'strongly recommends' that everyone supports the Unicode BMP table with |
| 721 | // the UCS-4 table for non-BMP glyphs. We'll pass the following subtables: |
| 722 | // Platform ID Encoding ID Format |
| 723 | // 0 0 4 (Unicode Default) |
| 724 | // 0 3 4 (Unicode BMP) |
| 725 | // 0 3 12 (Unicode UCS-4) |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 726 | // 0 5 14 (Unicode Variation Sequences) |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 727 | // 1 0 0 (Mac Roman) |
| 728 | // 3 0 4 (MS Symbol) |
| 729 | // 3 1 4 (MS Unicode BMP) |
| 730 | // 3 10 12 (MS Unicode UCS-4) |
| 731 | // 3 10 13 (MS UCS-4 Fallback mapping) |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 732 | // |
| 733 | // Note: |
| 734 | // * 0-0-4 table is (usually) written as a 3-1-4 table. If 3-1-4 table |
| 735 | // also exists, the 0-0-4 table is ignored. |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 736 | // * Unlike 0-0-4 table, 0-3-4 table is written as a 0-3-4 table. |
| 737 | // Some fonts which include 0-5-14 table seems to be required 0-3-4 |
| 738 | // table. The 0-3-4 table will be wriiten even if 3-1-4 table also exists. |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 739 | // * 0-3-12 table is written as a 3-10-12 table. If 3-10-12 table also |
| 740 | // exists, the 0-3-12 table is ignored. |
| 741 | // |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 742 | |
| 743 | for (unsigned i = 0; i < num_tables; ++i) { |
| 744 | if (subtable_headers[i].platform == 0) { |
| 745 | // Unicode platform |
| 746 | |
| 747 | if ((subtable_headers[i].encoding == 0) && |
| 748 | (subtable_headers[i].format == 4)) { |
| 749 | // parse and output the 0-0-4 table as 3-1-4 table. Sometimes the 0-0-4 |
| 750 | // table actually points to MS symbol data and thus should be parsed as |
| 751 | // 3-0-4 table (e.g., marqueem.ttf and quixotic.ttf). This error will be |
| 752 | // recovered in ots_cmap_serialise(). |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 753 | if (!ParseFormat4(file, 3, 1, data + subtable_headers[i].offset, |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 754 | subtable_headers[i].length, num_glyphs)) { |
| 755 | return OTS_FAILURE(); |
| 756 | } |
| 757 | } else if ((subtable_headers[i].encoding == 3) && |
| 758 | (subtable_headers[i].format == 4)) { |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 759 | // parse and output the 0-3-4 table as 0-3-4 table. |
| 760 | if (!ParseFormat4(file, 0, 3, data + subtable_headers[i].offset, |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 761 | subtable_headers[i].length, num_glyphs)) { |
| 762 | return OTS_FAILURE(); |
| 763 | } |
| 764 | } else if ((subtable_headers[i].encoding == 3) && |
| 765 | (subtable_headers[i].format == 12)) { |
| 766 | // parse and output the 0-3-12 table as 3-10-12 table. |
| 767 | if (!Parse31012(file, data + subtable_headers[i].offset, |
| 768 | subtable_headers[i].length, num_glyphs)) { |
| 769 | return OTS_FAILURE(); |
| 770 | } |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 771 | } else if ((subtable_headers[i].encoding == 5) && |
| 772 | (subtable_headers[i].format == 14)) { |
| 773 | if (!Parse0514(file, data + subtable_headers[i].offset, |
| 774 | subtable_headers[i].length, num_glyphs)) { |
| 775 | return OTS_FAILURE(); |
| 776 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 777 | } |
| 778 | } else if (subtable_headers[i].platform == 1) { |
| 779 | // Mac platform |
| 780 | |
| 781 | if ((subtable_headers[i].encoding == 0) && |
| 782 | (subtable_headers[i].format == 0)) { |
| 783 | // parse and output the 1-0-0 table. |
| 784 | if (!Parse100(file, data + subtable_headers[i].offset, |
| 785 | subtable_headers[i].length)) { |
| 786 | return OTS_FAILURE(); |
| 787 | } |
| 788 | } |
| 789 | } else if (subtable_headers[i].platform == 3) { |
| 790 | // MS platform |
| 791 | |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 792 | switch (subtable_headers[i].encoding) { |
| 793 | case 0: |
| 794 | case 1: |
| 795 | if (subtable_headers[i].format == 4) { |
| 796 | // parse 3-0-4 or 3-1-4 table. |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 797 | if (!ParseFormat4(file, subtable_headers[i].platform, |
| 798 | subtable_headers[i].encoding, |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 799 | data + subtable_headers[i].offset, |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 800 | subtable_headers[i].length, num_glyphs)) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 801 | return OTS_FAILURE(); |
| 802 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 803 | } |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 804 | break; |
| 805 | case 10: |
| 806 | if (subtable_headers[i].format == 12) { |
| 807 | file->cmap->subtable_3_10_12.clear(); |
| 808 | if (!Parse31012(file, data + subtable_headers[i].offset, |
| 809 | subtable_headers[i].length, num_glyphs)) { |
| 810 | return OTS_FAILURE(); |
| 811 | } |
| 812 | } else if (subtable_headers[i].format == 13) { |
| 813 | file->cmap->subtable_3_10_13.clear(); |
| 814 | if (!Parse31013(file, data + subtable_headers[i].offset, |
| 815 | subtable_headers[i].length, num_glyphs)) { |
| 816 | return OTS_FAILURE(); |
| 817 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 818 | } |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 819 | break; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 820 | } |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | return true; |
| 825 | } |
| 826 | |
| 827 | bool ots_cmap_should_serialise(OpenTypeFile *file) { |
agl@chromium.org | 2beaf1d | 2011-01-21 17:19:34 +0000 | [diff] [blame] | 828 | return file->cmap != NULL; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | bool ots_cmap_serialise(OTSStream *out, OpenTypeFile *file) { |
agl@chromium.org | 2beaf1d | 2011-01-21 17:19:34 +0000 | [diff] [blame] | 832 | const bool have_034 = file->cmap->subtable_0_3_4_data != NULL; |
| 833 | const bool have_0514 = file->cmap->subtable_0_5_14.size() != 0; |
| 834 | const bool have_100 = file->cmap->subtable_1_0_0.size() != 0; |
| 835 | const bool have_304 = file->cmap->subtable_3_0_4_data != NULL; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 836 | // MS Symbol and MS Unicode tables should not co-exist. |
| 837 | // See the comment above in 0-0-4 parser. |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 838 | const bool have_314 = (!have_304) && file->cmap->subtable_3_1_4_data; |
agl@chromium.org | 2beaf1d | 2011-01-21 17:19:34 +0000 | [diff] [blame] | 839 | const bool have_31012 = file->cmap->subtable_3_10_12.size() != 0; |
| 840 | const bool have_31013 = file->cmap->subtable_3_10_13.size() != 0; |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 841 | const unsigned num_subtables = static_cast<unsigned>(have_034) + |
| 842 | static_cast<unsigned>(have_0514) + |
| 843 | static_cast<unsigned>(have_100) + |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 844 | static_cast<unsigned>(have_304) + |
| 845 | static_cast<unsigned>(have_314) + |
| 846 | static_cast<unsigned>(have_31012) + |
| 847 | static_cast<unsigned>(have_31013); |
| 848 | const off_t table_start = out->Tell(); |
| 849 | |
| 850 | // Some fonts don't have 3-0-4 MS Symbol nor 3-1-4 Unicode BMP tables |
bashi@chromium.org | 6462c58 | 2014-06-27 06:24:49 +0000 | [diff] [blame] | 851 | // (e.g., old fonts for Mac). We don't support them except for color bitmap |
| 852 | // fonts. |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 853 | if (!have_304 && !have_314 && !have_034) { |
bashi@chromium.org | 6462c58 | 2014-06-27 06:24:49 +0000 | [diff] [blame] | 854 | if (!(file->cbdt && file->cblc)) { |
| 855 | return OTS_FAILURE(); |
| 856 | } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 857 | } |
| 858 | |
| 859 | if (!out->WriteU16(0) || |
| 860 | !out->WriteU16(num_subtables)) { |
| 861 | return OTS_FAILURE(); |
| 862 | } |
| 863 | |
| 864 | const off_t record_offset = out->Tell(); |
| 865 | if (!out->Pad(num_subtables * 8)) { |
| 866 | return OTS_FAILURE(); |
| 867 | } |
| 868 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 869 | const off_t offset_034 = out->Tell(); |
| 870 | if (have_034) { |
| 871 | if (!out->Write(file->cmap->subtable_0_3_4_data, |
| 872 | file->cmap->subtable_0_3_4_length)) { |
| 873 | return OTS_FAILURE(); |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | const off_t offset_0514 = out->Tell(); |
| 878 | if (have_0514) { |
| 879 | const std::vector<ots::OpenTypeCMAPSubtableVSRecord> &records |
| 880 | = file->cmap->subtable_0_5_14; |
| 881 | const unsigned num_records = records.size(); |
| 882 | if (!out->WriteU16(14) || |
| 883 | !out->WriteU32(file->cmap->subtable_0_5_14_length) || |
| 884 | !out->WriteU32(num_records)) { |
| 885 | return OTS_FAILURE(); |
| 886 | } |
| 887 | for (unsigned i = 0; i < num_records; ++i) { |
| 888 | if (!out->WriteU24(records[i].var_selector) || |
| 889 | !out->WriteU32(records[i].default_offset) || |
| 890 | !out->WriteU32(records[i].non_default_offset)) { |
| 891 | return OTS_FAILURE(); |
| 892 | } |
| 893 | } |
| 894 | for (unsigned i = 0; i < num_records; ++i) { |
| 895 | if (records[i].default_offset) { |
| 896 | const std::vector<ots::OpenTypeCMAPSubtableVSRange> &ranges |
| 897 | = records[i].ranges; |
| 898 | const unsigned num_ranges = ranges.size(); |
| 899 | if (!out->Seek(records[i].default_offset + offset_0514) || |
| 900 | !out->WriteU32(num_ranges)) { |
| 901 | return OTS_FAILURE(); |
| 902 | } |
| 903 | for (unsigned j = 0; j < num_ranges; ++j) { |
| 904 | if (!out->WriteU24(ranges[j].unicode_value) || |
| 905 | !out->WriteU8(ranges[j].additional_count)) { |
| 906 | return OTS_FAILURE(); |
| 907 | } |
| 908 | } |
| 909 | } |
| 910 | if (records[i].non_default_offset) { |
| 911 | const std::vector<ots::OpenTypeCMAPSubtableVSMapping> &mappings |
| 912 | = records[i].mappings; |
| 913 | const unsigned num_mappings = mappings.size(); |
| 914 | if (!out->Seek(records[i].non_default_offset + offset_0514) || |
| 915 | !out->WriteU32(num_mappings)) { |
| 916 | return OTS_FAILURE(); |
| 917 | } |
| 918 | for (unsigned j = 0; j < num_mappings; ++j) { |
| 919 | if (!out->WriteU24(mappings[j].unicode_value) || |
| 920 | !out->WriteU16(mappings[j].glyph_id)) { |
| 921 | return OTS_FAILURE(); |
| 922 | } |
| 923 | } |
| 924 | } |
| 925 | } |
| 926 | } |
| 927 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 928 | const off_t offset_100 = out->Tell(); |
| 929 | if (have_100) { |
| 930 | if (!out->WriteU16(0) || // format |
| 931 | !out->WriteU16(6 + kFormat0ArraySize) || // length |
| 932 | !out->WriteU16(0)) { // language |
| 933 | return OTS_FAILURE(); |
| 934 | } |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 935 | if (!out->Write(&(file->cmap->subtable_1_0_0[0]), kFormat0ArraySize)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 936 | return OTS_FAILURE(); |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | const off_t offset_304 = out->Tell(); |
| 941 | if (have_304) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 942 | if (!out->Write(file->cmap->subtable_3_0_4_data, |
| 943 | file->cmap->subtable_3_0_4_length)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 944 | return OTS_FAILURE(); |
| 945 | } |
| 946 | } |
| 947 | |
| 948 | const off_t offset_314 = out->Tell(); |
| 949 | if (have_314) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 950 | if (!out->Write(file->cmap->subtable_3_1_4_data, |
| 951 | file->cmap->subtable_3_1_4_length)) { |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 952 | return OTS_FAILURE(); |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | const off_t offset_31012 = out->Tell(); |
| 957 | if (have_31012) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 958 | std::vector<OpenTypeCMAPSubtableRange> &groups |
| 959 | = file->cmap->subtable_3_10_12; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 960 | const unsigned num_groups = groups.size(); |
| 961 | if (!out->WriteU16(12) || |
| 962 | !out->WriteU16(0) || |
| 963 | !out->WriteU32(num_groups * 12 + 16) || |
| 964 | !out->WriteU32(0) || |
| 965 | !out->WriteU32(num_groups)) { |
| 966 | return OTS_FAILURE(); |
| 967 | } |
| 968 | |
| 969 | for (unsigned i = 0; i < num_groups; ++i) { |
| 970 | if (!out->WriteU32(groups[i].start_range) || |
| 971 | !out->WriteU32(groups[i].end_range) || |
| 972 | !out->WriteU32(groups[i].start_glyph_id)) { |
| 973 | return OTS_FAILURE(); |
| 974 | } |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | const off_t offset_31013 = out->Tell(); |
| 979 | if (have_31013) { |
yusukes@chromium.org | a4099a3 | 2009-11-12 01:43:51 +0000 | [diff] [blame] | 980 | std::vector<OpenTypeCMAPSubtableRange> &groups |
| 981 | = file->cmap->subtable_3_10_13; |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 982 | const unsigned num_groups = groups.size(); |
| 983 | if (!out->WriteU16(13) || |
| 984 | !out->WriteU16(0) || |
| 985 | !out->WriteU32(num_groups * 12 + 14) || |
| 986 | !out->WriteU32(0) || |
| 987 | !out->WriteU32(num_groups)) { |
| 988 | return OTS_FAILURE(); |
| 989 | } |
| 990 | |
| 991 | for (unsigned i = 0; i < num_groups; ++i) { |
| 992 | if (!out->WriteU32(groups[i].start_range) || |
| 993 | !out->WriteU32(groups[i].end_range) || |
| 994 | !out->WriteU32(groups[i].start_glyph_id)) { |
| 995 | return OTS_FAILURE(); |
| 996 | } |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | const off_t table_end = out->Tell(); |
| 1001 | // We might have hanging bytes from the above's checksum which the OTSStream |
| 1002 | // then merges into the table of offsets. |
| 1003 | OTSStream::ChecksumState saved_checksum = out->SaveChecksumState(); |
| 1004 | out->ResetChecksum(); |
| 1005 | |
| 1006 | // Now seek back and write the table of offsets |
| 1007 | if (!out->Seek(record_offset)) { |
| 1008 | return OTS_FAILURE(); |
| 1009 | } |
| 1010 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 1011 | if (have_034) { |
| 1012 | if (!out->WriteU16(0) || |
| 1013 | !out->WriteU16(3) || |
| 1014 | !out->WriteU32(offset_034 - table_start)) { |
| 1015 | return OTS_FAILURE(); |
| 1016 | } |
| 1017 | } |
| 1018 | |
| 1019 | if (have_0514) { |
| 1020 | if (!out->WriteU16(0) || |
| 1021 | !out->WriteU16(5) || |
| 1022 | !out->WriteU32(offset_0514 - table_start)) { |
| 1023 | return OTS_FAILURE(); |
| 1024 | } |
| 1025 | } |
| 1026 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 1027 | if (have_100) { |
| 1028 | if (!out->WriteU16(1) || |
| 1029 | !out->WriteU16(0) || |
| 1030 | !out->WriteU32(offset_100 - table_start)) { |
| 1031 | return OTS_FAILURE(); |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | if (have_304) { |
| 1036 | if (!out->WriteU16(3) || |
| 1037 | !out->WriteU16(0) || |
| 1038 | !out->WriteU32(offset_304 - table_start)) { |
| 1039 | return OTS_FAILURE(); |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | if (have_314) { |
| 1044 | if (!out->WriteU16(3) || |
| 1045 | !out->WriteU16(1) || |
| 1046 | !out->WriteU32(offset_314 - table_start)) { |
| 1047 | return OTS_FAILURE(); |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | if (have_31012) { |
| 1052 | if (!out->WriteU16(3) || |
| 1053 | !out->WriteU16(10) || |
| 1054 | !out->WriteU32(offset_31012 - table_start)) { |
| 1055 | return OTS_FAILURE(); |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | if (have_31013) { |
| 1060 | if (!out->WriteU16(3) || |
| 1061 | !out->WriteU16(10) || |
| 1062 | !out->WriteU32(offset_31013 - table_start)) { |
| 1063 | return OTS_FAILURE(); |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | if (!out->Seek(table_end)) { |
| 1068 | return OTS_FAILURE(); |
| 1069 | } |
| 1070 | out->RestoreChecksum(saved_checksum); |
| 1071 | |
| 1072 | return true; |
| 1073 | } |
| 1074 | |
| 1075 | void ots_cmap_free(OpenTypeFile *file) { |
| 1076 | delete file->cmap; |
| 1077 | } |
| 1078 | |
| 1079 | } // namespace ots |