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105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
#include <IO/CompressionMethod.h>
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#include <IO/ReadBuffer.h>
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#include <IO/WriteBuffer.h>
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#include <IO/ZlibInflatingReadBuffer.h>
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#include <IO/ZlibDeflatingWriteBuffer.h>
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#include <IO/BrotliReadBuffer.h>
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#include <IO/BrotliWriteBuffer.h>
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#include <Common/config.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NOT_IMPLEMENTED;
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}
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std::string toContentEncodingName(CompressionMethod method)
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{
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switch (method)
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{
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case CompressionMethod::Gzip: return "gzip";
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case CompressionMethod::Zlib: return "deflate";
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case CompressionMethod::Brotli: return "br";
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case CompressionMethod::None: return "";
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}
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__builtin_unreachable();
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}
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CompressionMethod chooseCompressionMethod(const std::string & path, const std::string & hint)
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{
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std::string file_extension;
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if (hint.empty() || hint == "auto")
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{
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auto pos = path.find_last_of('.');
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if (pos != std::string::npos)
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file_extension = path.substr(pos + 1, std::string::npos);
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}
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const std::string * method_str = file_extension.empty() ? &hint : &file_extension;
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if (*method_str == "gzip" || *method_str == "gz")
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return CompressionMethod::Gzip;
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if (*method_str == "deflate")
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return CompressionMethod::Zlib;
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if (*method_str == "brotli" || *method_str == "br")
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return CompressionMethod::Brotli;
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if (hint.empty() || hint == "auto" || hint == "none")
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return CompressionMethod::None;
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throw Exception("Unknown compression method " + hint + ". Only 'auto', 'none', 'gzip', 'br' are supported as compression methods",
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ErrorCodes::NOT_IMPLEMENTED);
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}
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std::unique_ptr<ReadBuffer> wrapReadBufferWithCompressionMethod(
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std::unique_ptr<ReadBuffer> nested,
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CompressionMethod 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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{
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if (method == CompressionMethod::Gzip || method == CompressionMethod::Zlib)
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return std::make_unique<ZlibInflatingReadBuffer>(std::move(nested), method, buf_size, existing_memory, alignment);
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#if USE_BROTLI
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if (method == CompressionMethod::Brotli)
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return std::make_unique<BrotliReadBuffer>(std::move(nested), buf_size, existing_memory, alignment);
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#endif
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if (method == CompressionMethod::None)
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return nested;
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throw Exception("Unsupported compression method", ErrorCodes::NOT_IMPLEMENTED);
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}
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std::unique_ptr<WriteBuffer> wrapWriteBufferWithCompressionMethod(
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std::unique_ptr<WriteBuffer> nested,
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CompressionMethod method,
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int 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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{
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if (method == DB::CompressionMethod::Gzip || method == CompressionMethod::Zlib)
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return std::make_unique<ZlibDeflatingWriteBuffer>(std::move(nested), method, level, buf_size, existing_memory, alignment);
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#if USE_BROTLI
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if (method == DB::CompressionMethod::Brotli)
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return std::make_unique<BrotliWriteBuffer>(std::move(nested), level, buf_size, existing_memory, alignment);
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#endif
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if (method == CompressionMethod::None)
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return nested;
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throw Exception("Unsupported compression method", ErrorCodes::NOT_IMPLEMENTED);
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}
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}
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