83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
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// Copyright (c) 2012-2014, The CryptoNote developers, The Bytecoin developers
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//
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// This file is part of Bytecoin.
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//
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// Bytecoin is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Bytecoin is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include "IStream.h"
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#include <vector>
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#include <algorithm>
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#include <cstring> // memcpy
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namespace cryptonote {
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class MemoryStream:
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public IInputStream,
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public IOutputStream {
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public:
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MemoryStream() :
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m_readPos(0), m_writePos(0) {}
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virtual void write(const char* data, std::size_t size) override {
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if (size == 0) {
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return;
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}
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if (m_writePos + size > m_buffer.size()) {
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m_buffer.resize(m_writePos + size);
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}
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memcpy(&m_buffer[m_writePos], data, size);
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m_writePos += size;
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}
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virtual std::size_t read(char* data, std::size_t size) override {
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size_t readSize = std::min(size, m_buffer.size() - m_readPos);
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if (readSize > 0) {
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memcpy(data, &m_buffer[m_readPos], readSize);
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m_readPos += readSize;
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}
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return readSize;
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}
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size_t size() {
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return m_buffer.size();
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}
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const char* data() {
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return m_buffer.data();
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}
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void clear() {
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m_readPos = 0;
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m_writePos = 0;
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m_buffer.resize(0);
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}
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private:
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size_t m_readPos;
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size_t m_writePos;
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std::vector<char> m_buffer;
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};
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}
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