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Add clear method to byte_stream

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This commit is contained in:
Lee Clagett 2020-08-17 16:20:09 -04:00
parent 765db1ae7a
commit b641e0a2c0
2 changed files with 44 additions and 0 deletions
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3
contrib/epee/include/byte_stream.h
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@ -117,6 +117,9 @@ namespace epee
check(more); check(more);
} }
//! Reset write position, but do not release internal memory. \post `size() == 0`.
void clear() noexcept { next_write_ = buffer_.get(); }
/*! Copy `length` bytes starting at `ptr` to end of stream. /*! Copy `length` bytes starting at `ptr` to end of stream.
\throw std::range_error If exceeding max size_t value. \throw std::range_error If exceeding max size_t value.
\throw std::bad_alloc If allocation fails. */ \throw std::bad_alloc If allocation fails. */

41
tests/unit_tests/epee_utils.cpp
View file

@ -1117,6 +1117,47 @@ TEST(ByteStream, ToByteSlice)
EXPECT_EQ(nullptr, empty_slice.data()); EXPECT_EQ(nullptr, empty_slice.data());
} }
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());
EXPECT_EQ(nullptr, stream.data());
EXPECT_EQ(nullptr, stream.tellp());
EXPECT_EQ(0u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(0u, stream.capacity());
stream.clear();
EXPECT_EQ(nullptr, stream.data());
EXPECT_EQ(nullptr, stream.tellp());
EXPECT_EQ(0u, stream.size());
EXPECT_EQ(0u, stream.available());
EXPECT_EQ(0u, stream.capacity());
stream.write({source, 3});
std::uint8_t const* const loc = stream.data();
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());
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());
}
TEST(ToHex, String) TEST(ToHex, String)
{ {
EXPECT_TRUE(epee::to_hex::string(nullptr).empty()); EXPECT_TRUE(epee::to_hex::string(nullptr).empty());