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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "lz4_output_encoder.h"
#include <lz4frame.h>
#include <cassert>
namespace vespalib {
void
Lz4OutputEncoder::encode_frame()
{
auto dst = _output.reserve(LZ4F_compressFrameBound(_used, nullptr));
size_t written = LZ4F_compressFrame(dst.data, dst.size, &_buffer[0], _used, nullptr);
assert(!LZ4F_isError(written));
assert(written <= dst.size);
_output.commit(written);
_used = 0;
}
Lz4OutputEncoder::Lz4OutputEncoder(Output &output, size_t buffer_size)
: _output(output),
_buffer(buffer_size, 0),
_used(0),
_limit(buffer_size)
{
}
Lz4OutputEncoder::~Lz4OutputEncoder()
{
if (_used > 0) {
encode_frame();
}
}
WritableMemory
Lz4OutputEncoder::reserve(size_t bytes)
{
if ((_used + bytes) > _buffer.size()) {
_buffer.resize(_used + bytes, 0);
}
return WritableMemory(&_buffer[_used], (_buffer.size() - _used));
}
Output &
Lz4OutputEncoder::commit(size_t bytes)
{
_used += bytes;
if (_used >= _limit) {
encode_frame();
}
return *this;
}
} // namespace vespalib
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