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#include "clickhouse_config.h"
#if USE_BZIP2
# include <IO/Bzip2WriteBuffer.h>
# error #include <bzlib.h>
#include <Common/MemoryTracker.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BZIP2_STREAM_ENCODER_FAILED;
}
class Bzip2WriteBuffer::Bzip2StateWrapper
{
public:
explicit Bzip2StateWrapper(int compression_level)
{
memset(&stream, 0, sizeof(stream));
int ret = BZ2_bzCompressInit(&stream, compression_level, 0, 0);
if (ret != BZ_OK)
throw Exception(
ErrorCodes::BZIP2_STREAM_ENCODER_FAILED,
"bzip2 stream encoder init failed: error code: {}",
ret);
}
~Bzip2StateWrapper()
{
BZ2_bzCompressEnd(&stream);
}
bz_stream stream;
};
Bzip2WriteBuffer::Bzip2WriteBuffer(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)
, bz(std::make_unique<Bzip2StateWrapper>(compression_level))
{
}
Bzip2WriteBuffer::~Bzip2WriteBuffer() = default;
void Bzip2WriteBuffer::nextImpl()
{
if (!offset())
{
return;
}
bz->stream.next_in = working_buffer.begin();
bz->stream.avail_in = static_cast<unsigned>(offset());
try
{
do
{
out->nextIfAtEnd();
bz->stream.next_out = out->position();
bz->stream.avail_out = static_cast<unsigned>(out->buffer().end() - out->position());
int ret = BZ2_bzCompress(&bz->stream, BZ_RUN);
out->position() = out->buffer().end() - bz->stream.avail_out;
if (ret != BZ_RUN_OK)
throw Exception(
ErrorCodes::BZIP2_STREAM_ENCODER_FAILED,
"bzip2 stream encoder failed: error code: {}",
ret);
}
while (bz->stream.avail_in > 0);
}
catch (...)
{
/// Do not try to write next time after exception.
out->position() = out->buffer().begin();
throw;
}
}
void Bzip2WriteBuffer::finalizeBefore()
{
next();
out->nextIfAtEnd();
bz->stream.next_out = out->position();
bz->stream.avail_out = static_cast<unsigned>(out->buffer().end() - out->position());
int ret = BZ2_bzCompress(&bz->stream, BZ_FINISH);
out->position() = out->buffer().end() - bz->stream.avail_out;
if (ret != BZ_STREAM_END && ret != BZ_FINISH_OK)
throw Exception(
ErrorCodes::BZIP2_STREAM_ENCODER_FAILED,
"bzip2 stream encoder failed: error code: {}",
ret);
}
}
#endif
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