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#ifndef FASTBUFFER_H
#define FASTBUFFER_H 1
#include <boost/asio/buffer.hpp>
#include <boost/format.hpp>
#include <boost/noncopyable.hpp>
#include <exception>
#include <string>
class BufferException : public std::exception {
public:
explicit BufferException(const char *what) : m_what(what) {}
explicit BufferException(const std::string &what) : m_what(what) {}
virtual ~BufferException() noexcept {}
virtual const char *what() const noexcept { return m_what.c_str(); }
private:
std::string m_what;
};
class BufferBase {
public:
explicit BufferBase(std::size_t size)
: m_bufferOffset{0}, m_bufferUsed{0}, m_bufferSize{size} {
m_buffer = new std::uint8_t[size];
}
BufferBase(BufferBase &&moveable) {
m_bufferOffset = std::move(moveable.m_bufferOffset);
m_bufferUsed = std::move(moveable.m_bufferUsed);
m_bufferSize = std::move(moveable.m_bufferSize);
m_buffer = std::move(moveable.m_buffer);
moveable.m_buffer = nullptr;
moveable.m_bufferOffset = moveable.m_bufferUsed = moveable.m_bufferSize = 0;
}
~BufferBase() { delete[] m_buffer; }
void operator+=(std::size_t commit_size) {
checkFreeSpace(commit_size);
m_bufferUsed += commit_size;
}
void operator+=(const std::initializer_list<uint8_t> &to_add) {
checkFreeSpace(to_add.size());
std::copy(to_add.begin(), to_add.end(), &m_buffer[m_bufferUsed]);
m_bufferUsed += to_add.size();
}
void operator-=(std::size_t consume_size) {
const auto unconsumed_space = unconsumed();
checkConsumableSpace(consume_size);
if (consume_size == unconsumed_space) {
m_bufferUsed = m_bufferOffset = 0;
return;
}
m_bufferOffset += consume_size;
}
auto operator+() {
return boost::asio::buffer(&m_buffer[m_bufferUsed], unused());
}
auto operator-() {
return boost::asio::buffer(&m_buffer[m_bufferOffset], m_bufferUsed);
}
auto operator[](std::size_t index) const { return m_buffer[index]; }
const auto *operator()(std::size_t index) const { return &m_buffer[index]; }
auto *operator()() { return &m_buffer[m_bufferUsed]; }
auto size() const { return m_bufferUsed; }
auto capacity() const { return m_bufferSize; }
std::size_t unused() const { return m_bufferSize - m_bufferUsed; }
std::size_t unconsumed() const { return m_bufferUsed - m_bufferOffset; }
void checkFreeSpace(std::size_t commit_size) const {
const auto free_space = unused();
if (commit_size > free_space)
throw BufferException(
(boost::format(
"Buffer overflow: %1% bytes free, %1% bytes required") %
free_space % commit_size)
.str());
}
void checkConsumableSpace(std::size_t consume_size) const {
const auto unconsumed_space = unconsumed();
if (consume_size > unconsumed_space)
throw BufferException(
(boost::format(
"Buffer underflow: %1% bytes used, %1% bytes consumed") %
unconsumed_space % consume_size)
.str());
};
auto getHealth() const {
return (static_cast<float>(m_bufferUsed) /
static_cast<float>(m_bufferSize));
}
auto getConsumeHealth() const {
return (static_cast<float>(unconsumed()) /
static_cast<float>(m_bufferSize));
}
private:
std::size_t m_bufferOffset;
std::size_t m_bufferUsed;
std::size_t m_bufferSize;
std::uint8_t *m_buffer;
};
using ContiguousStreamBuffer = BufferBase;
class ContiguousPacketQueue : public boost::noncopyable {
public:
struct Element {
std::size_t size;
};
explicit ContiguousPacketQueue(std::size_t max_packets,
std::size_t max_queue_size)
: m_buffer(max_queue_size), m_packetsOffset{0}, m_packetsUsed{0},
m_packetsSize{max_packets} {
m_packets = new Element[max_packets];
}
ContiguousPacketQueue(ContiguousPacketQueue &&moveable)
: m_buffer(std::move(moveable.m_buffer)) {
m_packetsOffset = std::move(moveable.m_packetsOffset);
m_packetsUsed = std::move(moveable.m_packetsUsed);
m_packetsSize = std::move(moveable.m_packetsSize);
m_packets = std::move(moveable.m_packets);
moveable.m_packets = nullptr;
moveable.m_packetsOffset = moveable.m_packetsUsed = moveable.m_packetsSize =
0;
}
~ContiguousPacketQueue() { delete[] m_packets; }
void operator+=(std::size_t commit_size) {
m_packets[m_packetsUsed++].size = commit_size;
m_buffer += commit_size;
}
void operator+=(const std::initializer_list<uint8_t> &to_add) {
m_packets[m_packetsUsed++].size = to_add.size();
m_buffer += to_add;
}
void operator--() {
const auto consume_size = m_packets[m_packetsOffset].size;
m_buffer -= consume_size;
if (++m_packetsOffset == m_packetsUsed) {
m_packetsOffset = m_packetsUsed = 0;
return;
}
}
auto operator+() { return +m_buffer; }
auto operator-() { return -m_buffer; }
auto size() const { return m_packetsUsed; }
auto capacity() const { return m_packetsSize; }
std::size_t unused() const { return m_packetsSize - m_packetsUsed; }
std::size_t unconsumed() const { return m_packetsUsed - m_packetsOffset; }
const auto *GetBuffer() const { return &m_buffer; }
private:
BufferBase m_buffer;
std::size_t m_packetsOffset;
std::size_t m_packetsUsed;
std::size_t m_packetsSize;
Element *m_packets;
};
#endif
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