| // Copyright (c) 2012-2017 The OTS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cff.h" |
| |
| #include <cstring> |
| #include <utility> |
| #include <vector> |
| |
| #include "maxp.h" |
| #include "cff_type2_charstring.h" |
| |
| #if defined(STARBOARD) |
| #include "starboard/client_porting/poem/string_poem.h" |
| #define STRCHR_OTS strchr |
| #else |
| #define STRCHR_OTS std::strchr |
| #endif |
| |
| // CFF - PostScript font program (Compact Font Format) table |
| // http://www.microsoft.com/typography/otspec/cff.htm |
| // http://www.microsoft.com/typography/otspec/cffspec.htm |
| |
| #define TABLE_NAME "CFF" |
| |
| namespace { |
| |
| enum DICT_OPERAND_TYPE { |
| DICT_OPERAND_INTEGER, |
| DICT_OPERAND_REAL, |
| DICT_OPERATOR, |
| }; |
| |
| enum DICT_DATA_TYPE { |
| DICT_DATA_TOPLEVEL, |
| DICT_DATA_FDARRAY, |
| }; |
| |
| enum FONT_FORMAT { |
| FORMAT_UNKNOWN, |
| FORMAT_CID_KEYED, |
| FORMAT_OTHER, // Including synthetic fonts |
| }; |
| |
| // see Appendix. A |
| const size_t kNStdString = 390; |
| |
| bool ReadOffset(ots::Buffer *table, uint8_t off_size, uint32_t *offset) { |
| if (off_size > 4) { |
| return OTS_FAILURE(); |
| } |
| |
| uint32_t tmp32 = 0; |
| for (unsigned i = 0; i < off_size; ++i) { |
| uint8_t tmp8 = 0; |
| if (!table->ReadU8(&tmp8)) { |
| return OTS_FAILURE(); |
| } |
| tmp32 <<= 8; |
| tmp32 += tmp8; |
| } |
| *offset = tmp32; |
| return true; |
| } |
| |
| bool ParseIndex(ots::Buffer *table, ots::CFFIndex *index) { |
| index->off_size = 0; |
| index->offsets.clear(); |
| |
| if (!table->ReadU16(&(index->count))) { |
| return OTS_FAILURE(); |
| } |
| if (index->count == 0) { |
| // An empty INDEX. |
| index->offset_to_next = table->offset(); |
| return true; |
| } |
| |
| if (!table->ReadU8(&(index->off_size))) { |
| return OTS_FAILURE(); |
| } |
| if ((index->off_size == 0) || |
| (index->off_size > 4)) { |
| return OTS_FAILURE(); |
| } |
| |
| const size_t array_size = (index->count + 1) * index->off_size; |
| // less than ((64k + 1) * 4), thus does not overflow. |
| const size_t object_data_offset = table->offset() + array_size; |
| // does not overflow too, since offset() <= 1GB. |
| |
| if (object_data_offset >= table->length()) { |
| return OTS_FAILURE(); |
| } |
| |
| for (unsigned i = 0; i <= index->count; ++i) { // '<=' is not a typo. |
| uint32_t rel_offset = 0; |
| if (!ReadOffset(table, index->off_size, &rel_offset)) { |
| return OTS_FAILURE(); |
| } |
| if (rel_offset < 1) { |
| return OTS_FAILURE(); |
| } |
| if (i == 0 && rel_offset != 1) { |
| return OTS_FAILURE(); |
| } |
| |
| if (rel_offset > table->length()) { |
| return OTS_FAILURE(); |
| } |
| |
| // does not underflow. |
| if (object_data_offset > table->length() - (rel_offset - 1)) { |
| return OTS_FAILURE(); |
| } |
| |
| index->offsets.push_back( |
| object_data_offset + (rel_offset - 1)); // less than length(), 1GB. |
| } |
| |
| for (unsigned i = 1; i < index->offsets.size(); ++i) { |
| // We allow consecutive identical offsets here for zero-length strings. |
| // See http://crbug.com/69341 for more details. |
| if (index->offsets[i] < index->offsets[i - 1]) { |
| return OTS_FAILURE(); |
| } |
| } |
| |
| index->offset_to_next = index->offsets.back(); |
| return true; |
| } |
| |
| bool ParseNameData( |
| ots::Buffer *table, const ots::CFFIndex &index, std::string* out_name) { |
| uint8_t name[256] = {0}; |
| if (index.offsets.size() == 0) { // just in case. |
| return OTS_FAILURE(); |
| } |
| for (unsigned i = 1; i < index.offsets.size(); ++i) { |
| const size_t length = index.offsets[i] - index.offsets[i - 1]; |
| // font names should be no longer than 127 characters. |
| if (length > 127) { |
| return OTS_FAILURE(); |
| } |
| |
| table->set_offset(index.offsets[i - 1]); |
| if (!table->Read(name, length)) { |
| return OTS_FAILURE(); |
| } |
| |
| for (size_t j = 0; j < length; ++j) { |
| // setting the first byte to NUL is allowed. |
| if (j == 0 && name[j] == 0) continue; |
| // non-ASCII characters are not recommended (except the first character). |
| if (name[j] < 33 || name[j] > 126) { |
| return OTS_FAILURE(); |
| } |
| // [, ], ... are not allowed. |
| if (STRCHR_OTS("[](){}<>/% ", name[j])) { |
| return OTS_FAILURE(); |
| } |
| } |
| } |
| |
| *out_name = reinterpret_cast<char *>(name); |
| return true; |
| } |
| |
| bool CheckOffset(const std::pair<uint32_t, DICT_OPERAND_TYPE>& operand, |
| size_t table_length) { |
| if (operand.second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| if (operand.first >= table_length) { |
| return OTS_FAILURE(); |
| } |
| return true; |
| } |
| |
| bool CheckSid(const std::pair<uint32_t, DICT_OPERAND_TYPE>& operand, |
| size_t sid_max) { |
| if (operand.second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| if (operand.first > sid_max) { |
| return OTS_FAILURE(); |
| } |
| return true; |
| } |
| |
| bool ParseDictDataBcd( |
| ots::Buffer *table, |
| std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| bool read_decimal_point = false; |
| bool read_e = false; |
| |
| uint8_t nibble = 0; |
| size_t count = 0; |
| while (true) { |
| if (!table->ReadU8(&nibble)) { |
| return OTS_FAILURE(); |
| } |
| if ((nibble & 0xf0) == 0xf0) { |
| if ((nibble & 0xf) == 0xf) { |
| // TODO(yusukes): would be better to store actual double value, |
| // rather than the dummy integer. |
| operands->push_back(std::make_pair(static_cast<uint32_t>(0), |
| DICT_OPERAND_REAL)); |
| return true; |
| } |
| return OTS_FAILURE(); |
| } |
| if ((nibble & 0x0f) == 0x0f) { |
| operands->push_back(std::make_pair(static_cast<uint32_t>(0), |
| DICT_OPERAND_REAL)); |
| return true; |
| } |
| |
| // check number format |
| uint8_t nibbles[2]; |
| nibbles[0] = (nibble & 0xf0) >> 8; |
| nibbles[1] = (nibble & 0x0f); |
| for (unsigned i = 0; i < 2; ++i) { |
| if (nibbles[i] == 0xd) { // reserved number |
| return OTS_FAILURE(); |
| } |
| if ((nibbles[i] == 0xe) && // minus |
| ((count > 0) || (i > 0))) { |
| return OTS_FAILURE(); // minus sign should be the first character. |
| } |
| if (nibbles[i] == 0xa) { // decimal point |
| if (!read_decimal_point) { |
| read_decimal_point = true; |
| } else { |
| return OTS_FAILURE(); // two or more points. |
| } |
| } |
| if ((nibbles[i] == 0xb) || // E+ |
| (nibbles[i] == 0xc)) { // E- |
| if (!read_e) { |
| read_e = true; |
| } else { |
| return OTS_FAILURE(); // two or more E's. |
| } |
| } |
| } |
| ++count; |
| } |
| } |
| |
| bool ParseDictDataEscapedOperator( |
| ots::Buffer *table, |
| std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| uint8_t op = 0; |
| if (!table->ReadU8(&op)) { |
| return OTS_FAILURE(); |
| } |
| |
| if ((op <= 14) || |
| (op >= 17 && op <= 23) || |
| (op >= 30 && op <= 38)) { |
| operands->push_back(std::make_pair((12U << 8) + op, DICT_OPERATOR)); |
| return true; |
| } |
| |
| // reserved area. |
| return OTS_FAILURE(); |
| } |
| |
| bool ParseDictDataNumber( |
| ots::Buffer *table, uint8_t b0, |
| std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| uint8_t b1 = 0; |
| uint8_t b2 = 0; |
| uint8_t b3 = 0; |
| uint8_t b4 = 0; |
| |
| switch (b0) { |
| case 28: // shortint |
| if (!table->ReadU8(&b1) || |
| !table->ReadU8(&b2)) { |
| return OTS_FAILURE(); |
| } |
| operands->push_back(std::make_pair( |
| static_cast<uint32_t>((b1 << 8) + b2), DICT_OPERAND_INTEGER)); |
| return true; |
| |
| case 29: // longint |
| if (!table->ReadU8(&b1) || |
| !table->ReadU8(&b2) || |
| !table->ReadU8(&b3) || |
| !table->ReadU8(&b4)) { |
| return OTS_FAILURE(); |
| } |
| operands->push_back(std::make_pair( |
| static_cast<uint32_t>((b1 << 24) + (b2 << 16) + (b3 << 8) + b4), |
| DICT_OPERAND_INTEGER)); |
| return true; |
| |
| case 30: // binary coded decimal |
| return ParseDictDataBcd(table, operands); |
| |
| default: |
| break; |
| } |
| |
| uint32_t result; |
| if (b0 >=32 && b0 <=246) { |
| result = b0 - 139; |
| } else if (b0 >=247 && b0 <= 250) { |
| if (!table->ReadU8(&b1)) { |
| return OTS_FAILURE(); |
| } |
| result = (b0 - 247) * 256 + b1 + 108; |
| } else if (b0 >= 251 && b0 <= 254) { |
| if (!table->ReadU8(&b1)) { |
| return OTS_FAILURE(); |
| } |
| result = -(b0 - 251) * 256 + b1 - 108; |
| } else { |
| return OTS_FAILURE(); |
| } |
| |
| operands->push_back(std::make_pair(result, DICT_OPERAND_INTEGER)); |
| return true; |
| } |
| |
| bool ParseDictDataReadNext( |
| ots::Buffer *table, |
| std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > *operands) { |
| uint8_t op = 0; |
| if (!table->ReadU8(&op)) { |
| return OTS_FAILURE(); |
| } |
| if (op <= 21) { |
| if (op == 12) { |
| return ParseDictDataEscapedOperator(table, operands); |
| } |
| operands->push_back(std::make_pair( |
| static_cast<uint32_t>(op), DICT_OPERATOR)); |
| return true; |
| } else if (op <= 27 || op == 31 || op == 255) { |
| // reserved area. |
| return OTS_FAILURE(); |
| } |
| |
| return ParseDictDataNumber(table, op, operands); |
| } |
| |
| bool ParsePrivateDictData( |
| const uint8_t *data, |
| size_t table_length, size_t offset, size_t dict_length, |
| DICT_DATA_TYPE type, ots::OpenTypeCFF *out_cff) { |
| ots::Buffer table(data + offset, dict_length); |
| std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > operands; |
| |
| // Since a Private DICT for FDArray might not have a Local Subr (e.g. Hiragino |
| // Kaku Gothic Std W8), we create an empty Local Subr here to match the size |
| // of FDArray the size of |local_subrs_per_font|. |
| if (type == DICT_DATA_FDARRAY) { |
| out_cff->local_subrs_per_font.push_back(new ots::CFFIndex); |
| } |
| |
| while (table.offset() < dict_length) { |
| if (!ParseDictDataReadNext(&table, &operands)) { |
| return OTS_FAILURE(); |
| } |
| if (operands.empty()) { |
| return OTS_FAILURE(); |
| } |
| if (operands.size() > 48) { |
| // An operator may be preceded by up to a maximum of 48 operands. |
| return OTS_FAILURE(); |
| } |
| if (operands.back().second != DICT_OPERATOR) { |
| continue; |
| } |
| |
| // got operator |
| const uint32_t op = operands.back().first; |
| operands.pop_back(); |
| |
| switch (op) { |
| // hints |
| case 6: // BlueValues |
| case 7: // OtherBlues |
| case 8: // FamilyBlues |
| case 9: // FamilyOtherBlues |
| if ((operands.size() % 2) != 0) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // array |
| case (12U << 8) + 12: // StemSnapH (delta) |
| case (12U << 8) + 13: // StemSnapV (delta) |
| if (operands.empty()) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // number |
| case 10: // StdHW |
| case 11: // StdVW |
| case 20: // defaultWidthX |
| case 21: // nominalWidthX |
| case (12U << 8) + 9: // BlueScale |
| case (12U << 8) + 10: // BlueShift |
| case (12U << 8) + 11: // BlueFuzz |
| case (12U << 8) + 17: // LanguageGroup |
| case (12U << 8) + 18: // ExpansionFactor |
| case (12U << 8) + 19: // initialRandomSeed |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // Local Subrs INDEX, offset(self) |
| case 19: { |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first >= 1024 * 1024 * 1024) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first + offset >= table_length) { |
| return OTS_FAILURE(); |
| } |
| // parse "16. Local Subrs INDEX" |
| ots::Buffer cff_table(data, table_length); |
| cff_table.set_offset(operands.back().first + offset); |
| ots::CFFIndex *local_subrs_index = NULL; |
| if (type == DICT_DATA_FDARRAY) { |
| if (out_cff->local_subrs_per_font.empty()) { |
| return OTS_FAILURE(); // not reached. |
| } |
| local_subrs_index = out_cff->local_subrs_per_font.back(); |
| } else { // type == DICT_DATA_TOPLEVEL |
| if (out_cff->local_subrs) { |
| return OTS_FAILURE(); // two or more local_subrs? |
| } |
| local_subrs_index = new ots::CFFIndex; |
| out_cff->local_subrs = local_subrs_index; |
| } |
| if (!ParseIndex(&cff_table, local_subrs_index)) { |
| return OTS_FAILURE(); |
| } |
| break; |
| } |
| |
| // boolean |
| case (12U << 8) + 14: // ForceBold |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first >= 2) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| default: |
| return OTS_FAILURE(); |
| } |
| operands.clear(); |
| } |
| |
| return true; |
| } |
| |
| bool ParseDictData(const uint8_t *data, size_t table_length, |
| const ots::CFFIndex &index, uint16_t glyphs, |
| size_t sid_max, DICT_DATA_TYPE type, |
| ots::OpenTypeCFF *out_cff) { |
| for (unsigned i = 1; i < index.offsets.size(); ++i) { |
| if (type == DICT_DATA_TOPLEVEL) { |
| out_cff->char_strings_array.push_back(new ots::CFFIndex); |
| } |
| size_t dict_length = index.offsets[i] - index.offsets[i - 1]; |
| ots::Buffer table(data + index.offsets[i - 1], dict_length); |
| |
| std::vector<std::pair<uint32_t, DICT_OPERAND_TYPE> > operands; |
| |
| FONT_FORMAT font_format = FORMAT_UNKNOWN; |
| bool have_ros = false; |
| uint16_t charstring_glyphs = 0; |
| size_t charset_offset = 0; |
| |
| while (table.offset() < dict_length) { |
| if (!ParseDictDataReadNext(&table, &operands)) { |
| return OTS_FAILURE(); |
| } |
| if (operands.empty()) { |
| return OTS_FAILURE(); |
| } |
| if (operands.size() > 48) { |
| // An operator may be preceded by up to a maximum of 48 operands. |
| return OTS_FAILURE(); |
| } |
| if (operands.back().second != DICT_OPERATOR) continue; |
| |
| // got operator |
| const uint32_t op = operands.back().first; |
| operands.pop_back(); |
| |
| switch (op) { |
| // SID |
| case 0: // version |
| case 1: // Notice |
| case 2: // Copyright |
| case 3: // FullName |
| case 4: // FamilyName |
| case (12U << 8) + 0: // Copyright |
| case (12U << 8) + 21: // PostScript |
| case (12U << 8) + 22: // BaseFontName |
| case (12U << 8) + 38: // FontName |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (!CheckSid(operands.back(), sid_max)) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // array |
| case 5: // FontBBox |
| case 14: // XUID |
| case (12U << 8) + 7: // FontMatrix |
| case (12U << 8) + 23: // BaseFontBlend (delta) |
| if (operands.empty()) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // number |
| case 13: // UniqueID |
| case (12U << 8) + 2: // ItalicAngle |
| case (12U << 8) + 3: // UnderlinePosition |
| case (12U << 8) + 4: // UnderlineThickness |
| case (12U << 8) + 5: // PaintType |
| case (12U << 8) + 8: // StrokeWidth |
| case (12U << 8) + 20: // SyntheticBase |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| break; |
| case (12U << 8) + 31: // CIDFontVersion |
| case (12U << 8) + 32: // CIDFontRevision |
| case (12U << 8) + 33: // CIDFontType |
| case (12U << 8) + 34: // CIDCount |
| case (12U << 8) + 35: // UIDBase |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (font_format != FORMAT_CID_KEYED) { |
| return OTS_FAILURE(); |
| } |
| break; |
| case (12U << 8) + 6: // CharstringType |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if(operands.back().second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first != 2) { |
| // We only support the "Type 2 Charstring Format." |
| // TODO(yusukes): Support Type 1 format? Is that still in use? |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // boolean |
| case (12U << 8) + 1: // isFixedPitch |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first >= 2) { |
| return OTS_FAILURE(); |
| } |
| break; |
| |
| // offset(0) |
| case 15: // charset |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first <= 2) { |
| // predefined charset, ISOAdobe, Expert or ExpertSubset, is used. |
| break; |
| } |
| if (!CheckOffset(operands.back(), table_length)) { |
| return OTS_FAILURE(); |
| } |
| if (charset_offset) { |
| return OTS_FAILURE(); // multiple charset tables? |
| } |
| charset_offset = operands.back().first; |
| break; |
| |
| case 16: { // Encoding |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().first <= 1) { |
| break; // predefined encoding, "Standard" or "Expert", is used. |
| } |
| if (!CheckOffset(operands.back(), table_length)) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse sub dictionary INDEX. |
| ots::Buffer cff_table(data, table_length); |
| cff_table.set_offset(operands.back().first); |
| uint8_t format = 0; |
| if (!cff_table.ReadU8(&format)) { |
| return OTS_FAILURE(); |
| } |
| if (format & 0x80) { |
| // supplemental encoding is not supported at the moment. |
| return OTS_FAILURE(); |
| } |
| // TODO(yusukes): support & parse supplemental encoding tables. |
| break; |
| } |
| |
| case 17: { // CharStrings |
| if (type != DICT_DATA_TOPLEVEL) { |
| return OTS_FAILURE(); |
| } |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (!CheckOffset(operands.back(), table_length)) { |
| return OTS_FAILURE(); |
| } |
| // parse "14. CharStrings INDEX" |
| ots::Buffer cff_table(data, table_length); |
| cff_table.set_offset(operands.back().first); |
| ots::CFFIndex *charstring_index = out_cff->char_strings_array.back(); |
| if (!ParseIndex(&cff_table, charstring_index)) { |
| return OTS_FAILURE(); |
| } |
| if (charstring_index->count < 2) { |
| return OTS_FAILURE(); |
| } |
| if (charstring_glyphs) { |
| return OTS_FAILURE(); // multiple charstring tables? |
| } |
| charstring_glyphs = charstring_index->count; |
| if (charstring_glyphs != glyphs) { |
| return OTS_FAILURE(); // CFF and maxp have different number of glyphs? |
| } |
| break; |
| } |
| |
| case (12U << 8) + 36: { // FDArray |
| if (type != DICT_DATA_TOPLEVEL) { |
| return OTS_FAILURE(); |
| } |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (!CheckOffset(operands.back(), table_length)) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse sub dictionary INDEX. |
| ots::Buffer cff_table(data, table_length); |
| cff_table.set_offset(operands.back().first); |
| ots::CFFIndex sub_dict_index; |
| if (!ParseIndex(&cff_table, &sub_dict_index)) { |
| return OTS_FAILURE(); |
| } |
| if (!ParseDictData(data, table_length, |
| sub_dict_index, |
| glyphs, sid_max, DICT_DATA_FDARRAY, |
| out_cff)) { |
| return OTS_FAILURE(); |
| } |
| if (out_cff->font_dict_length != 0) { |
| return OTS_FAILURE(); // two or more FDArray found. |
| } |
| out_cff->font_dict_length = sub_dict_index.count; |
| break; |
| } |
| |
| case (12U << 8) + 37: { // FDSelect |
| if (type != DICT_DATA_TOPLEVEL) { |
| return OTS_FAILURE(); |
| } |
| if (operands.size() != 1) { |
| return OTS_FAILURE(); |
| } |
| if (!CheckOffset(operands.back(), table_length)) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse FDSelect data structure |
| ots::Buffer cff_table(data, table_length); |
| cff_table.set_offset(operands.back().first); |
| uint8_t format = 0; |
| if (!cff_table.ReadU8(&format)) { |
| return OTS_FAILURE(); |
| } |
| if (format == 0) { |
| for (uint16_t j = 0; j < glyphs; ++j) { |
| uint8_t fd_index = 0; |
| if (!cff_table.ReadU8(&fd_index)) { |
| return OTS_FAILURE(); |
| } |
| (out_cff->fd_select)[j] = fd_index; |
| } |
| } else if (format == 3) { |
| uint16_t n_ranges = 0; |
| if (!cff_table.ReadU16(&n_ranges)) { |
| return OTS_FAILURE(); |
| } |
| if (n_ranges == 0) { |
| return OTS_FAILURE(); |
| } |
| |
| uint16_t last_gid = 0; |
| uint8_t fd_index = 0; |
| for (unsigned j = 0; j < n_ranges; ++j) { |
| uint16_t first = 0; // GID |
| if (!cff_table.ReadU16(&first)) { |
| return OTS_FAILURE(); |
| } |
| |
| // Sanity checks. |
| if ((j == 0) && (first != 0)) { |
| return OTS_FAILURE(); |
| } |
| if ((j != 0) && (last_gid >= first)) { |
| return OTS_FAILURE(); // not increasing order. |
| } |
| |
| // Copy the mapping to |out_cff->fd_select|. |
| if (j != 0) { |
| for (uint16_t k = last_gid; k < first; ++k) { |
| if (!out_cff->fd_select.insert( |
| std::make_pair(k, fd_index)).second) { |
| return OTS_FAILURE(); |
| } |
| } |
| } |
| |
| if (!cff_table.ReadU8(&fd_index)) { |
| return OTS_FAILURE(); |
| } |
| last_gid = first; |
| // TODO(yusukes): check GID? |
| } |
| uint16_t sentinel = 0; |
| if (!cff_table.ReadU16(&sentinel)) { |
| return OTS_FAILURE(); |
| } |
| if (last_gid >= sentinel) { |
| return OTS_FAILURE(); |
| } |
| for (uint16_t k = last_gid; k < sentinel; ++k) { |
| if (!out_cff->fd_select.insert( |
| std::make_pair(k, fd_index)).second) { |
| return OTS_FAILURE(); |
| } |
| } |
| } else { |
| // unknown format |
| return OTS_FAILURE(); |
| } |
| break; |
| } |
| |
| // Private DICT (2 * number) |
| case 18: { |
| if (operands.size() != 2) { |
| return OTS_FAILURE(); |
| } |
| if (operands.back().second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| const uint32_t private_offset = operands.back().first; |
| operands.pop_back(); |
| if (operands.back().second != DICT_OPERAND_INTEGER) { |
| return OTS_FAILURE(); |
| } |
| const uint32_t private_length = operands.back().first; |
| if (private_offset > table_length) { |
| return OTS_FAILURE(); |
| } |
| if (private_length >= table_length) { |
| return OTS_FAILURE(); |
| } |
| if (private_length + private_offset > table_length) { |
| return OTS_FAILURE(); |
| } |
| // parse "15. Private DICT Data" |
| if (!ParsePrivateDictData(data, table_length, |
| private_offset, private_length, |
| type, out_cff)) { |
| return OTS_FAILURE(); |
| } |
| break; |
| } |
| |
| // ROS |
| case (12U << 8) + 30: |
| if (font_format != FORMAT_UNKNOWN) { |
| return OTS_FAILURE(); |
| } |
| font_format = FORMAT_CID_KEYED; |
| if (operands.size() != 3) { |
| return OTS_FAILURE(); |
| } |
| // check SIDs |
| operands.pop_back(); // ignore the first number. |
| if (!CheckSid(operands.back(), sid_max)) { |
| return OTS_FAILURE(); |
| } |
| operands.pop_back(); |
| if (!CheckSid(operands.back(), sid_max)) { |
| return OTS_FAILURE(); |
| } |
| if (have_ros) { |
| return OTS_FAILURE(); // multiple ROS tables? |
| } |
| have_ros = true; |
| break; |
| |
| default: |
| return OTS_FAILURE(); |
| } |
| operands.clear(); |
| |
| if (font_format == FORMAT_UNKNOWN) { |
| font_format = FORMAT_OTHER; |
| } |
| } |
| |
| // parse "13. Charsets" |
| if (charset_offset) { |
| ots::Buffer cff_table(data, table_length); |
| cff_table.set_offset(charset_offset); |
| uint8_t format = 0; |
| if (!cff_table.ReadU8(&format)) { |
| return OTS_FAILURE(); |
| } |
| switch (format) { |
| case 0: |
| for (uint16_t j = 1 /* .notdef is omitted */; j < glyphs; ++j) { |
| uint16_t sid = 0; |
| if (!cff_table.ReadU16(&sid)) { |
| return OTS_FAILURE(); |
| } |
| if (!have_ros && (sid > sid_max)) { |
| return OTS_FAILURE(); |
| } |
| // TODO(yusukes): check CIDs when have_ros is true. |
| } |
| break; |
| |
| case 1: |
| case 2: { |
| uint32_t total = 1; // .notdef is omitted. |
| while (total < glyphs) { |
| uint16_t sid = 0; |
| if (!cff_table.ReadU16(&sid)) { |
| return OTS_FAILURE(); |
| } |
| if (!have_ros && (sid > sid_max)) { |
| return OTS_FAILURE(); |
| } |
| // TODO(yusukes): check CIDs when have_ros is true. |
| |
| if (format == 1) { |
| uint8_t left = 0; |
| if (!cff_table.ReadU8(&left)) { |
| return OTS_FAILURE(); |
| } |
| total += (left + 1); |
| } else { |
| uint16_t left = 0; |
| if (!cff_table.ReadU16(&left)) { |
| return OTS_FAILURE(); |
| } |
| total += (left + 1); |
| } |
| } |
| break; |
| } |
| |
| default: |
| return OTS_FAILURE(); |
| } |
| } |
| } |
| return true; |
| } |
| |
| } // namespace |
| |
| namespace ots { |
| |
| bool OpenTypeCFF::Parse(const uint8_t *data, size_t length) { |
| Buffer table(data, length); |
| |
| Font *font = GetFont(); |
| |
| this->m_data = data; |
| this->m_length = length; |
| |
| // parse "6. Header" in the Adobe Compact Font Format Specification |
| uint8_t major = 0; |
| uint8_t minor = 0; |
| uint8_t hdr_size = 0; |
| uint8_t off_size = 0; |
| if (!table.ReadU8(&major)) { |
| return OTS_FAILURE(); |
| } |
| if (!table.ReadU8(&minor)) { |
| return OTS_FAILURE(); |
| } |
| if (!table.ReadU8(&hdr_size)) { |
| return OTS_FAILURE(); |
| } |
| if (!table.ReadU8(&off_size)) { |
| return OTS_FAILURE(); |
| } |
| if ((off_size == 0) || (off_size > 4)) { |
| return OTS_FAILURE(); |
| } |
| |
| if ((major != 1) || |
| (minor != 0) || |
| (hdr_size != 4)) { |
| return OTS_FAILURE(); |
| } |
| if (hdr_size >= length) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse "7. Name INDEX" |
| table.set_offset(hdr_size); |
| CFFIndex name_index; |
| if (!ParseIndex(&table, &name_index)) { |
| return OTS_FAILURE(); |
| } |
| if (!ParseNameData(&table, name_index, &(this->name))) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse "8. Top DICT INDEX" |
| table.set_offset(name_index.offset_to_next); |
| CFFIndex top_dict_index; |
| if (!ParseIndex(&table, &top_dict_index)) { |
| return OTS_FAILURE(); |
| } |
| if (name_index.count != top_dict_index.count) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse "10. String INDEX" |
| table.set_offset(top_dict_index.offset_to_next); |
| CFFIndex string_index; |
| if (!ParseIndex(&table, &string_index)) { |
| return OTS_FAILURE(); |
| } |
| if (string_index.count >= 65000 - kNStdString) { |
| return OTS_FAILURE(); |
| } |
| |
| OpenTypeMAXP *maxp = static_cast<OpenTypeMAXP*>( |
| GetFont()->GetTypedTable(OTS_TAG_MAXP)); |
| if (!maxp) { |
| return Error("Required maxp table missing"); |
| } |
| const uint16_t num_glyphs = maxp->num_glyphs; |
| const size_t sid_max = string_index.count + kNStdString; |
| // string_index.count == 0 is allowed. |
| |
| // parse "9. Top DICT Data" |
| if (!ParseDictData(data, length, top_dict_index, |
| num_glyphs, sid_max, |
| DICT_DATA_TOPLEVEL, this)) { |
| return OTS_FAILURE(); |
| } |
| |
| // parse "16. Global Subrs INDEX" |
| table.set_offset(string_index.offset_to_next); |
| CFFIndex global_subrs_index; |
| if (!ParseIndex(&table, &global_subrs_index)) { |
| return OTS_FAILURE(); |
| } |
| |
| // Check if all fd_index in FDSelect are valid. |
| std::map<uint16_t, uint8_t>::const_iterator iter; |
| std::map<uint16_t, uint8_t>::const_iterator end = this->fd_select.end(); |
| for (iter = this->fd_select.begin(); iter != end; ++iter) { |
| if (iter->second >= this->font_dict_length) { |
| return OTS_FAILURE(); |
| } |
| } |
| |
| // Check if all charstrings (font hinting code for each glyph) are valid. |
| for (size_t i = 0; i < this->char_strings_array.size(); ++i) { |
| if (!ValidateType2CharStringIndex(font, |
| *(this->char_strings_array.at(i)), |
| global_subrs_index, |
| this->fd_select, |
| this->local_subrs_per_font, |
| this->local_subrs, |
| &table)) { |
| return Error("Failed validating charstring set %d", (int) i); |
| } |
| } |
| |
| return true; |
| } |
| |
| bool OpenTypeCFF::Serialize(OTSStream *out) { |
| if (!out->Write(this->m_data, this->m_length)) { |
| return Error("Failed to write table"); |
| } |
| return true; |
| } |
| |
| OpenTypeCFF::~OpenTypeCFF() { |
| for (size_t i = 0; i < this->char_strings_array.size(); ++i) { |
| delete (this->char_strings_array)[i]; |
| } |
| for (size_t i = 0; i < this->local_subrs_per_font.size(); ++i) { |
| delete (this->local_subrs_per_font)[i]; |
| } |
| delete this->local_subrs; |
| } |
| |
| } // namespace ots |
| |
| #undef STRCHR_OTS |
| #undef TABLE_NAME |
