79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2014 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef BUFFER_H
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#define BUFFER_H
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#include "nghttp2_config.h"
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#include <cstring>
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#include <algorithm>
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#include <array>
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namespace nghttp2 {
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template <size_t N> struct Buffer {
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Buffer() : pos(std::begin(buf)), last(pos) {}
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// Returns the number of bytes to read.
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size_t rleft() const { return last - pos; }
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// Returns the number of bytes this buffer can store.
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size_t wleft() const { return std::end(buf) - last; }
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// Writes up to min(wleft(), |count|) bytes from buffer pointed by
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// |src|. Returns number of bytes written.
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size_t write(const void *src, size_t count) {
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count = std::min(count, wleft());
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auto p = static_cast<const uint8_t *>(src);
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last = std::copy_n(p, count, last);
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return count;
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}
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size_t write(size_t count) {
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count = std::min(count, wleft());
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last += count;
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return count;
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}
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// Drains min(rleft(), |count|) bytes from start of the buffer.
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size_t drain(size_t count) {
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count = std::min(count, rleft());
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pos += count;
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return count;
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}
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size_t drain_reset(size_t count) {
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count = std::min(count, rleft());
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std::copy(pos + count, last, std::begin(buf));
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last = std::begin(buf) + (last - (pos + count));
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pos = std::begin(buf);
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return count;
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}
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void reset() { pos = last = std::begin(buf); }
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uint8_t *begin() { return std::begin(buf); }
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uint8_t &operator[](size_t n) { return buf[n]; }
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const uint8_t &operator[](size_t n) const { return buf[n]; }
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std::array<uint8_t, N> buf;
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uint8_t *pos, *last;
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};
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} // namespace nghttp2
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#endif // BUFFER_H
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