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Change to more efficient allocation strategy in byte_stream

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This commit is contained in:
Lee Clagett 2020-10-13 15:10:54 +00:00
parent 83f1d863bd
commit 08eb0949f3
3 changed files with 58 additions and 61 deletions
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15
contrib/epee/include/byte_stream.h
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@ -58,7 +58,6 @@ namespace epee
byte_buffer buffer_; //! Beginning of buffer
std::uint8_t* next_write_; //! Current write position
const std::uint8_t* end_; //! End of buffer
std::size_t increase_size_; //! Minimum buffer size increase
//! \post `requested <= available()`
void overflow(const std::size_t requested);
@ -75,29 +74,17 @@ namespace epee
using char_type = std::uint8_t;
using Ch = char_type;
//! \return Default minimum size increase on buffer overflow
static constexpr std::size_t default_increase() noexcept { return 4096; }
//! Increase internal buffer by at least `byte_stream_increase` bytes.
byte_stream() noexcept
: byte_stream(default_increase())
{}
//! Increase internal buffer by at least `increase` bytes.
explicit byte_stream(const std::size_t increase) noexcept
: buffer_(nullptr),
next_write_(nullptr),
end_(nullptr),
increase_size_(increase)
end_(nullptr)
{}
byte_stream(byte_stream&& rhs) noexcept;
~byte_stream() noexcept = default;
byte_stream& operator=(byte_stream&& rhs) noexcept;
//! \return The minimum increase size on buffer overflow
std::size_t increase_size() const noexcept { return increase_size_; }
const std::uint8_t* data() const noexcept { return buffer_.get(); }
std::uint8_t* tellp() const noexcept { return next_write_; }
std::size_t available() const noexcept { return end_ - next_write_; }

11
contrib/epee/src/byte_stream.cpp
View file

@ -34,6 +34,11 @@
#include <iostream>
namespace
{
constexpr const std::size_t minimum_increase = 4096;
}
namespace epee
{
void byte_stream::overflow(const std::size_t requested)
@ -46,7 +51,7 @@ namespace epee
const std::size_t len = size();
const std::size_t cap = capacity();
const std::size_t increase = std::max(need, increase_size());
const std::size_t increase = std::max(std::max(need, cap), minimum_increase);
next_write_ = nullptr;
end_ = nullptr;
@ -62,8 +67,7 @@ namespace epee
byte_stream::byte_stream(byte_stream&& rhs) noexcept
: buffer_(std::move(rhs.buffer_)),
next_write_(rhs.next_write_),
end_(rhs.end_),
increase_size_(rhs.increase_size_)
end_(rhs.end_)
{
rhs.next_write_ = nullptr;
rhs.end_ = nullptr;
@ -76,7 +80,6 @@ namespace epee
buffer_ = std::move(rhs.buffer_);
next_write_ = rhs.next_write_;
end_ = rhs.end_;
increase_size_ = rhs.increase_size_;
rhs.next_write_ = nullptr;
rhs.end_ = nullptr;
}