95 lines
2.2 KiB
C++
95 lines
2.2 KiB
C++
// Copyright (C) 2013 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of 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 along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef BUFFER_H
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#define BUFFER_H
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#include <stdint.h>
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#include <malloc.h>
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#include <boost/optional.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/static_assert.hpp>
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#include <stdexcept>
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//----------------------------------------------------------------
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namespace persistent_data {
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uint32_t const DEFAULT_BUFFER_SIZE = 4096;
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template <uint32_t Size = DEFAULT_BUFFER_SIZE>
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class buffer {
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public:
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buffer(void *data, bool writeable = true)
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: data_(static_cast<unsigned char *>(data)),
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writeable_(writeable) {
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}
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typedef boost::shared_ptr<buffer> ptr;
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typedef boost::shared_ptr<buffer const> const_ptr;
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size_t size() const {
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return Size;
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}
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unsigned char &operator[](unsigned index) {
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check_writeable();
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check_index(index);
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return data_[index];
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}
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unsigned char const &operator[](unsigned index) const {
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check_index(index);
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return data_[index];
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}
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unsigned char *raw() {
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return data_;
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}
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unsigned char const *raw() const {
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return data_;
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}
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void set_data(void *data) {
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data_ = static_cast<unsigned char *>(data);
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}
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private:
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static void check_index(unsigned index) {
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if (index >= Size)
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throw std::range_error("buffer index out of bounds");
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}
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void check_writeable() const {
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if (!writeable_)
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throw std::runtime_error("buffer isn't writeable");
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}
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unsigned char *data_;
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bool writeable_;
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};
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}
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//----------------------------------------------------------------
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#endif
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