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| 1 // Copyright (c) 2010 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 #ifndef OTS_CFF_TYPE2_CHARSTRING_H_ |
| 6 #define OTS_CFF_TYPE2_CHARSTRING_H_ |
| 7 |
| 8 #include "cff.h" |
| 9 #include "ots.h" |
| 10 |
| 11 #include <map> |
| 12 #include <vector> |
| 13 |
| 14 namespace ots { |
| 15 |
| 16 // Validates all charstrings in |char_strings_index|. Charstring is a small |
| 17 // language for font hinting defined in Adobe Technical Note #5177. |
| 18 // http://www.adobe.com/devnet/font/pdfs/5177.Type2.pdf |
| 19 // |
| 20 // The validation will fail if one of the following conditions is met: |
| 21 // 1. The code uses more than 48 values of argument stack. |
| 22 // 2. The code uses deeply nested subroutine calls (more than 10 levels.) |
| 23 // 3. The code passes invalid number of operands to an operator. |
| 24 // 4. The code calls an undefined global or local subroutine. |
| 25 // 5. The code uses one of the following operators that are unlikely used in |
| 26 // an ordinary fonts, and could be dangerous: random, put, get, index, roll. |
| 27 // |
| 28 // Arguments: |
| 29 // global_subrs_index: Global subroutines which could be called by a charstring |
| 30 // in |char_strings_index|. |
| 31 // fd_select: A map from glyph # to font #. |
| 32 // local_subrs_per_font: A list of Local Subrs associated with FDArrays. Can be |
| 33 // empty. |
| 34 // local_subrs: A Local Subrs associated with Top DICT. Can be NULL. |
| 35 // cff_table: A buffer which contains actual byte code of charstring, global |
| 36 // subroutines and local subroutines. |
| 37 bool ValidateType2CharStringIndex( |
| 38 OpenTypeFile *file, |
| 39 const CFFIndex &char_strings_index, |
| 40 const CFFIndex &global_subrs_index, |
| 41 const std::map<uint16_t, uint8_t> &fd_select, |
| 42 const std::vector<CFFIndex *> &local_subrs_per_font, |
| 43 const CFFIndex *local_subrs, |
| 44 Buffer *cff_table); |
| 45 |
| 46 // The list of Operators. See Appendix. A in Adobe Technical Note #5177. |
| 47 enum Type2CharStringOperator { |
| 48 kHStem = 1, |
| 49 kVStem = 3, |
| 50 kVMoveTo = 4, |
| 51 kRLineTo = 5, |
| 52 kHLineTo = 6, |
| 53 kVLineTo = 7, |
| 54 kRRCurveTo = 8, |
| 55 kCallSubr = 10, |
| 56 kReturn = 11, |
| 57 kEndChar = 14, |
| 58 kHStemHm = 18, |
| 59 kHintMask = 19, |
| 60 kCntrMask = 20, |
| 61 kRMoveTo = 21, |
| 62 kHMoveTo = 22, |
| 63 kVStemHm = 23, |
| 64 kRCurveLine = 24, |
| 65 kRLineCurve = 25, |
| 66 kVVCurveTo = 26, |
| 67 kHHCurveTo = 27, |
| 68 kCallGSubr = 29, |
| 69 kVHCurveTo = 30, |
| 70 kHVCurveTo = 31, |
| 71 kDotSection = 12 << 8, |
| 72 kAnd = (12 << 8) + 3, |
| 73 kOr = (12 << 8) + 4, |
| 74 kNot = (12 << 8) + 5, |
| 75 kAbs = (12 << 8) + 9, |
| 76 kAdd = (12 << 8) + 10, |
| 77 kSub = (12 << 8) + 11, |
| 78 kDiv = (12 << 8) + 12, |
| 79 kNeg = (12 << 8) + 14, |
| 80 kEq = (12 << 8) + 15, |
| 81 kDrop = (12 << 8) + 18, |
| 82 kPut = (12 << 8) + 20, |
| 83 kGet = (12 << 8) + 21, |
| 84 kIfElse = (12 << 8) + 22, |
| 85 kRandom = (12 << 8) + 23, |
| 86 kMul = (12 << 8) + 24, |
| 87 kSqrt = (12 << 8) + 26, |
| 88 kDup = (12 << 8) + 27, |
| 89 kExch = (12 << 8) + 28, |
| 90 kIndex = (12 << 8) + 29, |
| 91 kRoll = (12 << 8) + 30, |
| 92 kHFlex = (12 << 8) + 34, |
| 93 kFlex = (12 << 8) + 35, |
| 94 kHFlex1 = (12 << 8) + 36, |
| 95 kFlex1 = (12 << 8) + 37, |
| 96 // Operators that are undocumented, such as 'blend', will be rejected. |
| 97 }; |
| 98 |
| 99 } // namespace ots |
| 100 |
| 101 #endif // OTS_CFF_TYPE2_CHARSTRING_H_ |
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