104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
// Copyright (c) 2010-2017 The OTS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef OTS_CFF_TYPE2_CHARSTRING_H_
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#define OTS_CFF_TYPE2_CHARSTRING_H_
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#include "cff.h"
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#include "ots.h"
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#include <map>
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#include <vector>
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namespace ots {
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const size_t kMaxCFF1ArgumentStack = 48;
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const size_t kMaxCFF2ArgumentStack = 513;
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// Validates all charstrings in |char_strings_index|. Charstring is a small
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// language for font hinting defined in Adobe Technical Note #5177.
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// http://www.adobe.com/devnet/font/pdfs/5177.Type2.pdf
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//
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// The validation will fail if one of the following conditions is met:
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// 1. The code uses more than 48 values of argument stack.
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// 2. The code uses deeply nested subroutine calls (more than 10 levels.)
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// 3. The code passes invalid number of operands to an operator.
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// 4. The code calls an undefined global or local subroutine.
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// 5. The code uses one of the following operators that are unlikely used in
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// an ordinary fonts, and could be dangerous: random, put, get, index, roll.
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//
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// Arguments:
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// global_subrs_index: Global subroutines which could be called by a charstring
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// in |char_strings_index|.
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// fd_select: A map from glyph # to font #.
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// local_subrs_per_font: A list of Local Subrs associated with FDArrays. Can be
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// empty.
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// local_subrs: A Local Subrs associated with Top DICT. Can be NULL.
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// cff_table: A buffer which contains actual byte code of charstring, global
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// subroutines and local subroutines.
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bool ValidateCFFCharStrings(
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OpenTypeCFF& cff,
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const CFFIndex &global_subrs_index,
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Buffer *cff_table);
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// The list of Operators. See Appendix. A in Adobe Technical Note #5177.
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// and https://docs.microsoft.com/en-us/typography/opentype/spec/cff2charstr
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enum CharStringOperator {
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kHStem = 1,
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kVStem = 3,
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kVMoveTo = 4,
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kRLineTo = 5,
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kHLineTo = 6,
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kVLineTo = 7,
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kRRCurveTo = 8,
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kCallSubr = 10,
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kReturn = 11,
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kEndChar = 14,
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kVSIndex = 15,
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kBlend = 16,
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kHStemHm = 18,
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kHintMask = 19,
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kCntrMask = 20,
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kRMoveTo = 21,
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kHMoveTo = 22,
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kVStemHm = 23,
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kRCurveLine = 24,
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kRLineCurve = 25,
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kVVCurveTo = 26,
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kHHCurveTo = 27,
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kCallGSubr = 29,
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kVHCurveTo = 30,
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kHVCurveTo = 31,
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kDotSection = 12 << 8,
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kAnd = (12 << 8) + 3,
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kOr = (12 << 8) + 4,
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kNot = (12 << 8) + 5,
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kAbs = (12 << 8) + 9,
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kAdd = (12 << 8) + 10,
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kSub = (12 << 8) + 11,
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kDiv = (12 << 8) + 12,
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kNeg = (12 << 8) + 14,
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kEq = (12 << 8) + 15,
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kDrop = (12 << 8) + 18,
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kPut = (12 << 8) + 20,
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kGet = (12 << 8) + 21,
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kIfElse = (12 << 8) + 22,
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kRandom = (12 << 8) + 23,
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kMul = (12 << 8) + 24,
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kSqrt = (12 << 8) + 26,
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kDup = (12 << 8) + 27,
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kExch = (12 << 8) + 28,
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kIndex = (12 << 8) + 29,
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kRoll = (12 << 8) + 30,
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kHFlex = (12 << 8) + 34,
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kFlex = (12 << 8) + 35,
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kHFlex1 = (12 << 8) + 36,
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kFlex1 = (12 << 8) + 37,
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// Operators that are undocumented, such as 'blend', will be rejected.
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};
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} // namespace ots
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#endif // OTS_CFF_TYPE2_CHARSTRING_H_
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