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105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
#include <IO/ZlibDeflatingWriteBuffer.h>
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namespace DB
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{
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ZlibDeflatingWriteBuffer::ZlibDeflatingWriteBuffer(
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WriteBuffer & out_,
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ZlibCompressionMethod compression_method,
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int compression_level,
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size_t buf_size,
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char * existing_memory,
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size_t alignment)
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: BufferWithOwnMemory<WriteBuffer>(buf_size, existing_memory, alignment)
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, out(out_)
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{
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zstr.zalloc = Z_NULL;
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zstr.zfree = Z_NULL;
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zstr.opaque = Z_NULL;
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zstr.next_in = 0;
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zstr.avail_in = 0;
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zstr.next_out = 0;
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zstr.avail_out = 0;
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int window_bits = 15;
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if (compression_method == ZlibCompressionMethod::Gzip)
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{
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window_bits += 16;
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}
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wold-style-cast"
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int rc = deflateInit2(&zstr, compression_level, Z_DEFLATED, window_bits, 8, Z_DEFAULT_STRATEGY);
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#pragma GCC diagnostic pop
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if (rc != Z_OK)
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throw Exception(std::string("deflateInit2 failed: ") + zError(rc) + "; zlib version: " + ZLIB_VERSION, ErrorCodes::ZLIB_DEFLATE_FAILED);
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}
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ZlibDeflatingWriteBuffer::~ZlibDeflatingWriteBuffer()
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{
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try
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{
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finish();
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int rc = deflateEnd(&zstr);
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if (rc != Z_OK)
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throw Exception(std::string("deflateEnd failed: ") + zError(rc), ErrorCodes::ZLIB_DEFLATE_FAILED);
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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}
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void ZlibDeflatingWriteBuffer::nextImpl()
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{
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if (!offset())
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return;
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zstr.next_in = reinterpret_cast<unsigned char *>(working_buffer.begin());
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zstr.avail_in = offset();
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do
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{
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out.nextIfAtEnd();
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zstr.next_out = reinterpret_cast<unsigned char *>(out.position());
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zstr.avail_out = out.buffer().end() - out.position();
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int rc = deflate(&zstr, Z_NO_FLUSH);
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out.position() = out.buffer().end() - zstr.avail_out;
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if (rc != Z_OK)
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throw Exception(std::string("deflate failed: ") + zError(rc), ErrorCodes::ZLIB_DEFLATE_FAILED);
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}
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while (zstr.avail_in > 0 || zstr.avail_out == 0);
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}
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void ZlibDeflatingWriteBuffer::finish()
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{
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if (finished)
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return;
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next();
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while (true)
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{
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out.nextIfAtEnd();
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zstr.next_out = reinterpret_cast<unsigned char *>(out.position());
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zstr.avail_out = out.buffer().end() - out.position();
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int rc = deflate(&zstr, Z_FINISH);
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out.position() = out.buffer().end() - zstr.avail_out;
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if (rc == Z_STREAM_END)
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return;
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if (rc != Z_OK)
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throw Exception(std::string("deflate finish failed: ") + zError(rc), ErrorCodes::ZLIB_DEFLATE_FAILED);
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}
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finished = true;
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}
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}
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