mirror of
https://github.com/xmrig/xmrig.git
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135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
/* XMRig
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* Copyright (c) 2012-2013 The Cryptonote developers
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* Copyright (c) 2014-2021 The Monero Project
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* Copyright (c) 2018-2021 SChernykh <https://github.com/SChernykh>
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* Copyright (c) 2016-2021 XMRig <https://github.com/xmrig>, <support@xmrig.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef XMRIG_BLOBREADER_H
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#define XMRIG_BLOBREADER_H
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#include <cstdint>
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#include <cstring>
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#include <stdexcept>
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namespace xmrig {
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template<bool EXCEPTIONS>
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class BlobReader
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{
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public:
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inline BlobReader(const uint8_t *data, size_t size) :
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m_size(size),
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m_data(data)
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{}
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inline bool operator()(uint64_t &data) { return getVarint(data); }
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inline bool operator()(uint8_t &data) { return getByte(data); }
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inline size_t index() const { return m_index; }
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inline size_t remaining() const { return m_size - m_index; }
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inline bool skip(size_t n)
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{
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if (m_index + n > m_size) {
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return outOfRange();
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}
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m_index += n;
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return true;
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}
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template<size_t N>
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inline bool operator()(uint8_t(&data)[N])
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{
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if (m_index + N > m_size) {
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return outOfRange();
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}
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memcpy(data, m_data + m_index, N);
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m_index += N;
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return true;
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}
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template<typename T>
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inline bool operator()(T &data, size_t n)
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{
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if (m_index + n > m_size) {
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return outOfRange();
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}
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data = { m_data + m_index, n };
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m_index += n;
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return true;
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}
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private:
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inline bool getByte(uint8_t &data)
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{
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if (m_index >= m_size) {
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return outOfRange();
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}
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data = m_data[m_index++];
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return true;
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}
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inline bool getVarint(uint64_t &data)
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{
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uint64_t result = 0;
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uint8_t t;
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int shift = 0;
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do {
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if (!getByte(t)) {
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return outOfRange();
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}
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result |= static_cast<uint64_t>(t & 0x7F) << shift;
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shift += 7;
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} while (t & 0x80);
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data = result;
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return true;
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}
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inline bool outOfRange()
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{
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if (EXCEPTIONS) {
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throw std::out_of_range("Blob read out of range");
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}
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return false;
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}
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const size_t m_size;
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const uint8_t *m_data;
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size_t m_index = 0;
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};
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} /* namespace xmrig */
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#endif /* XMRIG_BLOBREADER_H */
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