cff_charstring.h | Explore in Territory

// Copyright (c) 2010-2017 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.

#ifndef OTS_CFF_TYPE2_CHARSTRING_H_
#define OTS_CFF_TYPE2_CHARSTRING_H_

#include "cff.h"
#include "ots.h"

#include <map>
#include <vector>

namespace ots {

const size_t kMaxCFF1ArgumentStack = …;
const size_t kMaxCFF2ArgumentStack = …;

// Validates all charstrings in |char_strings_index|. Charstring is a small
// language for font hinting defined in Adobe Technical Note #5177.
// http://www.adobe.com/devnet/font/pdfs/5177.Type2.pdf
//
// The validation will fail if one of the following conditions is met:
//  1. The code uses more than the max argument stack size (48 for CFF1; 513 for CFF2)
//  2. The code uses deeply nested subroutine calls (more than 10 levels.)
//  3. The code passes invalid number of operands to an operator.
//  4. The code calls an undefined global or local subroutine.
//  5. The code uses one of the following operators that are unlikely used in
//     an ordinary fonts, and could be dangerous: random, put, get, index, roll.
//
// Arguments:
//  cff: parent OpenTypeCFF reference
//  global_subrs_index: Global subroutines which could be called by a charstring
//                      in |char_strings_index|.
//  cff_table: A buffer which contains actual byte code of charstring, global
//             subroutines and local subroutines.
bool ValidateCFFCharStrings(
    OpenTypeCFF& cff,
    const CFFIndex &global_subrs_index,
    Buffer *cff_table);

// The list of Operators. See Appendix. A in Adobe Technical Note #5177.
// and https://docs.microsoft.com/en-us/typography/opentype/spec/cff2charstr
enum CharStringOperator { … };

struct CharStringContext { … };

}  // namespace ots

#endif  // OTS_CFF_TYPE2_CHARSTRING_H_
chromium/third_party/ots/src/src/cff_charstring.h
