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// Copyright (c) 2009-2017 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_MEMORY_STREAM_H_
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#define OTS_MEMORY_STREAM_H_
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#include <cstring>
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#include <limits>
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#include "opentype-sanitiser.h"
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namespace ots {
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class MemoryStream : public OTSStream {
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public:
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MemoryStream(void *ptr, size_t length)
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: ptr_(ptr), length_(length), off_(0) {
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}
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virtual bool WriteRaw(const void *data, size_t length) {
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if ((off_ + length > length_) ||
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(length > std::numeric_limits<size_t>::max() - off_)) {
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return false;
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}
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std::memcpy(static_cast<char*>(ptr_) + off_, data, length);
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off_ += length;
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return true;
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}
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virtual bool Seek(off_t position) {
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if (position < 0) return false;
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if (static_cast<size_t>(position) > length_) return false;
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off_ = position;
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return true;
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}
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virtual off_t Tell() const {
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return off_;
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}
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private:
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void* const ptr_;
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size_t length_;
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off_t off_;
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};
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class ExpandingMemoryStream : public OTSStream {
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public:
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ExpandingMemoryStream(size_t initial, size_t limit)
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: length_(initial), limit_(limit), off_(0) {
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ptr_ = new uint8_t[length_];
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}
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~ExpandingMemoryStream() {
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delete[] static_cast<uint8_t*>(ptr_);
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}
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void* get() const {
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return ptr_;
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}
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bool WriteRaw(const void *data, size_t length) {
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if ((off_ + length > length_) ||
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(length > std::numeric_limits<size_t>::max() - off_)) {
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if (length_ == limit_)
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return false;
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size_t new_length = (length_ + 1) * 2;
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if (new_length < length_)
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return false;
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if (new_length > limit_)
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new_length = limit_;
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uint8_t* new_buf = new uint8_t[new_length];
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std::memcpy(new_buf, ptr_, length_);
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length_ = new_length;
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delete[] static_cast<uint8_t*>(ptr_);
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ptr_ = new_buf;
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return WriteRaw(data, length);
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}
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std::memcpy(static_cast<char*>(ptr_) + off_, data, length);
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off_ += length;
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return true;
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}
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bool Seek(off_t position) {
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if (position < 0) return false;
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if (static_cast<size_t>(position) > length_) return false;
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off_ = position;
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return true;
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}
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off_t Tell() const {
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return off_;
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}
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private:
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void* ptr_;
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size_t length_;
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const size_t limit_;
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off_t off_;
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};
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} // namespace ots
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#endif // OTS_MEMORY_STREAM_H_
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