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86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
#include <IO/ZlibInflatingReadBuffer.h>
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namespace DB
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{
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ZlibInflatingReadBuffer::ZlibInflatingReadBuffer(
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ReadBuffer & in_,
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ZlibCompressionMethod compression_method,
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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<ReadBuffer>(buf_size, existing_memory, alignment)
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, in(in_)
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, eof(false)
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{
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zstr.zalloc = nullptr;
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zstr.zfree = nullptr;
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zstr.opaque = nullptr;
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zstr.next_in = nullptr;
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zstr.avail_in = 0;
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zstr.next_out = nullptr;
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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 = inflateInit2(&zstr, window_bits);
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#pragma GCC diagnostic pop
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if (rc != Z_OK)
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throw Exception(std::string("inflateInit2 failed: ") + zError(rc) + "; zlib version: " + ZLIB_VERSION, ErrorCodes::ZLIB_INFLATE_FAILED);
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}
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ZlibInflatingReadBuffer::~ZlibInflatingReadBuffer()
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{
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inflateEnd(&zstr);
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}
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bool ZlibInflatingReadBuffer::nextImpl()
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{
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if (eof)
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return false;
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if (!zstr.avail_in)
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{
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in.nextIfAtEnd();
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zstr.next_in = reinterpret_cast<unsigned char *>(in.position());
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zstr.avail_in = in.buffer().end() - in.position();
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}
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zstr.next_out = reinterpret_cast<unsigned char *>(internal_buffer.begin());
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zstr.avail_out = internal_buffer.size();
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int rc = inflate(&zstr, Z_NO_FLUSH);
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in.position() = in.buffer().end() - zstr.avail_in;
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working_buffer.resize(internal_buffer.size() - zstr.avail_out);
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if (rc == Z_STREAM_END)
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{
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if (in.eof())
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{
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eof = true;
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return working_buffer.size() != 0;
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}
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else
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{
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rc = inflateReset(&zstr);
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if (rc != Z_OK)
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throw Exception(std::string("inflateReset failed: ") + zError(rc), ErrorCodes::ZLIB_INFLATE_FAILED);
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return true;
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}
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}
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if (rc != Z_OK)
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throw Exception(std::string("inflate failed: ") + zError(rc), ErrorCodes::ZLIB_INFLATE_FAILED);
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return true;
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}
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}
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