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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
View file

@ -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;
}

93
tests/unit_tests/epee_utils.cpp
View file

@ -886,8 +886,6 @@ TEST(ByteStream, Empty)
{
epee::byte_stream stream;
EXPECT_EQ(epee::byte_stream::default_increase(), stream.increase_size());
EXPECT_EQ(nullptr, stream.data());
EXPECT_EQ(nullptr, stream.tellp());
EXPECT_EQ(0u, stream.available());
@ -912,43 +910,55 @@ TEST(ByteStream, Write)
{0xde, 0xad, 0xbe, 0xef, 0xef};
std::vector<std::uint8_t> bytes;
epee::byte_stream stream{4};
EXPECT_EQ(4u, stream.increase_size());
epee::byte_stream stream{};
stream.write({source, 3});
bytes.insert(bytes.end(), source, source + 3);
EXPECT_EQ(3u, stream.size());
EXPECT_EQ(1u, stream.available());
EXPECT_EQ(4u, stream.capacity());
EXPECT_LE(3u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
const std::size_t capacity = stream.capacity();
stream.write({source, 2});
bytes.insert(bytes.end(), source, source + 2);
EXPECT_EQ(5u, stream.size());
EXPECT_EQ(3u, stream.available());
EXPECT_EQ(8u, stream.capacity());
EXPECT_LE(5u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
stream.write({source, 5});
bytes.insert(bytes.end(), source, source + 5);
EXPECT_EQ(10u, stream.size());
EXPECT_EQ(2u, stream.available());
EXPECT_EQ(12u, stream.capacity());
EXPECT_LE(10u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
stream.write({source, 2});
bytes.insert(bytes.end(), source, source + 2);
EXPECT_EQ(12u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(12u, stream.capacity());
EXPECT_LE(12u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
stream.write({source, 5});
bytes.insert(bytes.end(), source, source + 5);
EXPECT_EQ(17u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(17u, stream.capacity());
EXPECT_LE(17u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
// ensure it can overflow properly
while (capacity == stream.capacity())
{
stream.write({source, 5});
bytes.insert(bytes.end(), source, source + 5);
}
EXPECT_EQ(bytes.size(), stream.size());
EXPECT_LE(bytes.size(), stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
}
@ -967,8 +977,8 @@ TEST(ByteStream, Put)
}
EXPECT_EQ(200u, stream.size());
EXPECT_EQ(epee::byte_stream::default_increase() - 200, stream.available());
EXPECT_EQ(epee::byte_stream::default_increase(), stream.capacity());
EXPECT_LE(200u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
}
@ -981,14 +991,12 @@ TEST(ByteStream, Reserve)
{0xde, 0xad, 0xbe, 0xef, 0xef};
std::vector<std::uint8_t> bytes;
epee::byte_stream stream{4};
EXPECT_EQ(4u, stream.increase_size());
epee::byte_stream stream{};
stream.reserve(100);
EXPECT_EQ(100u, stream.capacity());
EXPECT_LE(100u, stream.capacity());
EXPECT_EQ(0u, stream.size());
EXPECT_EQ(100u, stream.available());
EXPECT_EQ(stream.available(), stream.capacity());
for (std::size_t i = 0; i < 100 / sizeof(source); ++i)
{
@ -997,8 +1005,8 @@ TEST(ByteStream, Reserve)
}
EXPECT_EQ(100u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(100u, stream.capacity());
EXPECT_LE(100u, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
EXPECT_TRUE(equal(bytes, byte_span{stream.data(), stream.size()}));
}
@ -1033,29 +1041,31 @@ TEST(ByteStream, Move)
static constexpr const std::uint8_t source[] =
{0xde, 0xad, 0xbe, 0xef, 0xef};
epee::byte_stream stream{10};
epee::byte_stream stream{};
stream.write(source);
const std::size_t capacity = stream.capacity();
std::uint8_t const* const data = stream.data();
EXPECT_LE(5u, capacity);
EXPECT_NE(nullptr, data);
epee::byte_stream stream2{std::move(stream)};
EXPECT_EQ(10u, stream.increase_size());
EXPECT_EQ(0u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(0u, stream.capacity());
EXPECT_EQ(nullptr, stream.data());
EXPECT_EQ(nullptr, stream.tellp());
EXPECT_EQ(10u, stream2.increase_size());
EXPECT_EQ(5u, stream2.size());
EXPECT_EQ(5u, stream2.available());
EXPECT_EQ(10u, stream2.capacity());
EXPECT_NE(nullptr, stream2.data());
EXPECT_NE(nullptr, stream2.tellp());
EXPECT_EQ(capacity, stream2.capacity());
EXPECT_EQ(capacity - 5, stream2.available());
EXPECT_EQ(data, stream2.data());
EXPECT_EQ(data + 5u, stream2.tellp());
EXPECT_TRUE(equal(source, byte_span{stream2.data(), stream2.size()}));
stream = epee::byte_stream{};
EXPECT_EQ(epee::byte_stream::default_increase(), stream.increase_size());
EXPECT_EQ(0u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(0u, stream.capacity());
@ -1064,15 +1074,13 @@ TEST(ByteStream, Move)
stream = std::move(stream2);
EXPECT_EQ(10u, stream.increase_size());
EXPECT_EQ(5u, stream.size());
EXPECT_EQ(5u, stream.available());
EXPECT_EQ(10u, stream.capacity());
EXPECT_EQ(capacity, stream.capacity());
EXPECT_EQ(capacity - 5, stream.available());
EXPECT_NE(nullptr, stream.data());
EXPECT_NE(nullptr, stream.tellp());
EXPECT_TRUE(equal(source, byte_span{stream.data(), stream.size()}));
EXPECT_EQ(10u, stream2.increase_size());
EXPECT_EQ(0u, stream2.size());
EXPECT_EQ(0u, stream2.available());
EXPECT_EQ(0u, stream2.capacity());
@ -1122,9 +1130,7 @@ TEST(ByteStream, Clear)
static constexpr const std::uint8_t source[] =
{0xde, 0xad, 0xbe, 0xef, 0xef};
epee::byte_stream stream{4};
EXPECT_EQ(4u, stream.increase_size());
epee::byte_stream stream{};
EXPECT_EQ(nullptr, stream.data());
EXPECT_EQ(nullptr, stream.tellp());
@ -1146,16 +1152,17 @@ TEST(ByteStream, Clear)
EXPECT_EQ(loc, stream.data());
EXPECT_EQ(loc + 3, stream.tellp());
EXPECT_EQ(3u, stream.size());
EXPECT_EQ(1u, stream.available());
EXPECT_EQ(4u, stream.capacity());
EXPECT_LE(stream.size(), stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
const std::size_t capacity = stream.capacity();
stream.clear();
EXPECT_EQ(loc, stream.data());
EXPECT_EQ(loc, stream.tellp());
EXPECT_EQ(0u, stream.size());
EXPECT_EQ(4u, stream.available());
EXPECT_EQ(4u, stream.capacity());
EXPECT_EQ(capacity, stream.capacity());
EXPECT_EQ(stream.available(), stream.capacity() - stream.size());
}
TEST(ToHex, String)