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#include "clickhouse_config.h"
#if USE_BROTLI
# include <IO/BrotliWriteBuffer.h>
# error #include <brotli/encode.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BROTLI_WRITE_FAILED;
}
class BrotliWriteBuffer::BrotliStateWrapper
{
public:
BrotliStateWrapper()
: state(BrotliEncoderCreateInstance(nullptr, nullptr, nullptr))
{
}
~BrotliStateWrapper()
{
BrotliEncoderDestroyInstance(state);
}
BrotliEncoderState * state;
};
BrotliWriteBuffer::BrotliWriteBuffer(std::unique_ptr<WriteBuffer> out_, int compression_level, size_t buf_size, char * existing_memory, size_t alignment)
: WriteBufferWithOwnMemoryDecorator(std::move(out_), buf_size, existing_memory, alignment)
, brotli(std::make_unique<BrotliStateWrapper>())
, in_available(0)
, in_data(nullptr)
, out_capacity(0)
, out_data(nullptr)
{
BrotliEncoderSetParameter(brotli->state, BROTLI_PARAM_QUALITY, static_cast<uint32_t>(compression_level));
// Set LZ77 window size. According to brotli sources default value is 24 (c/tools/brotli.c:81)
BrotliEncoderSetParameter(brotli->state, BROTLI_PARAM_LGWIN, 24);
}
BrotliWriteBuffer::~BrotliWriteBuffer() = default;
void BrotliWriteBuffer::nextImpl()
{
if (!offset())
{
return;
}
in_data = reinterpret_cast<unsigned char *>(working_buffer.begin());
in_available = offset();
try
{
do
{
out->nextIfAtEnd();
out_data = reinterpret_cast<unsigned char *>(out->position());
out_capacity = out->buffer().end() - out->position();
int result = BrotliEncoderCompressStream(
brotli->state,
in_available ? BROTLI_OPERATION_PROCESS : BROTLI_OPERATION_FINISH,
&in_available,
&in_data,
&out_capacity,
&out_data,
nullptr);
out->position() = out->buffer().end() - out_capacity;
if (result == 0)
{
throw Exception(ErrorCodes::BROTLI_WRITE_FAILED, "brotli compress failed");
}
}
while (in_available > 0);
}
catch (...)
{
/// Do not try to write next time after exception.
out->position() = out->buffer().begin();
throw;
}
}
void BrotliWriteBuffer::finalizeBefore()
{
next();
while (true)
{
out->nextIfAtEnd();
out_data = reinterpret_cast<unsigned char *>(out->position());
out_capacity = out->buffer().end() - out->position();
int result = BrotliEncoderCompressStream(
brotli->state,
BROTLI_OPERATION_FINISH,
&in_available,
&in_data,
&out_capacity,
&out_data,
nullptr);
out->position() = out->buffer().end() - out_capacity;
if (BrotliEncoderIsFinished(brotli->state))
{
return;
}
if (result == 0)
{
throw Exception(ErrorCodes::BROTLI_WRITE_FAILED, "brotli compress failed");
}
}
}
}
#endif
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