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#include <IO/ZlibDeflatingWriteBuffer.h>
#include <Common/Exception.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ZLIB_DEFLATE_FAILED;
}
ZlibDeflatingWriteBuffer::ZlibDeflatingWriteBuffer(
std::unique_ptr<WriteBuffer> out_,
CompressionMethod compression_method,
int compression_level,
size_t buf_size,
char * existing_memory,
size_t alignment)
: WriteBufferWithOwnMemoryDecorator(std::move(out_), buf_size, existing_memory, alignment)
{
zstr.zalloc = nullptr;
zstr.zfree = nullptr;
zstr.opaque = nullptr;
zstr.next_in = nullptr;
zstr.avail_in = 0;
zstr.next_out = nullptr;
zstr.avail_out = 0;
int window_bits = 15;
if (compression_method == CompressionMethod::Gzip)
{
window_bits += 16;
}
int rc = deflateInit2(&zstr, compression_level, Z_DEFLATED, window_bits, 8, Z_DEFAULT_STRATEGY);
if (rc != Z_OK)
throw Exception(ErrorCodes::ZLIB_DEFLATE_FAILED, "deflateInit2 failed: {}; zlib version: {}", zError(rc), ZLIB_VERSION);
}
void ZlibDeflatingWriteBuffer::nextImpl()
{
if (!offset())
return;
zstr.next_in = reinterpret_cast<unsigned char *>(working_buffer.begin());
zstr.avail_in = static_cast<unsigned>(offset());
try
{
do
{
out->nextIfAtEnd();
zstr.next_out = reinterpret_cast<unsigned char *>(out->position());
zstr.avail_out = static_cast<unsigned>(out->buffer().end() - out->position());
int rc = deflate(&zstr, Z_NO_FLUSH);
out->position() = out->buffer().end() - zstr.avail_out;
if (rc != Z_OK)
throw Exception(ErrorCodes::ZLIB_DEFLATE_FAILED, "deflate failed: {}", zError(rc));
}
while (zstr.avail_in > 0 || zstr.avail_out == 0);
}
catch (...)
{
/// Do not try to write next time after exception.
out->position() = out->buffer().begin();
throw;
}
}
ZlibDeflatingWriteBuffer::~ZlibDeflatingWriteBuffer() = default;
void ZlibDeflatingWriteBuffer::finalizeBefore()
{
next();
/// https://github.com/zlib-ng/zlib-ng/issues/494
do
{
out->nextIfAtEnd();
zstr.next_out = reinterpret_cast<unsigned char *>(out->position());
zstr.avail_out = static_cast<unsigned>(out->buffer().end() - out->position());
int rc = deflate(&zstr, Z_FULL_FLUSH);
out->position() = out->buffer().end() - zstr.avail_out;
if (rc != Z_OK)
throw Exception(ErrorCodes::ZLIB_DEFLATE_FAILED, "deflate failed: {}", zError(rc));
}
while (zstr.avail_out == 0);
while (true)
{
out->nextIfAtEnd();
zstr.next_out = reinterpret_cast<unsigned char *>(out->position());
zstr.avail_out = static_cast<unsigned>(out->buffer().end() - out->position());
int rc = deflate(&zstr, Z_FINISH);
out->position() = out->buffer().end() - zstr.avail_out;
if (rc == Z_STREAM_END)
{
return;
}
if (rc != Z_OK)
throw Exception(ErrorCodes::ZLIB_DEFLATE_FAILED, "deflate finalizeImpl() failed: {}", zError(rc));
}
}
void ZlibDeflatingWriteBuffer::finalizeAfter()
{
try
{
int rc = deflateEnd(&zstr);
if (rc != Z_OK)
throw Exception(ErrorCodes::ZLIB_DEFLATE_FAILED, "deflateEnd failed: {}", zError(rc));
}
catch (...)
{
/// It is OK not to terminate under an error from deflateEnd()
/// since all data already written to the stream.
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
}
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