ClickHouse/src/Compression/CompressionCodecNone.cpp
2024-03-04 03:06:27 +01:00

48 lines
1.3 KiB
C++

#include <Compression/CompressionCodecNone.h>
#include <Compression/CompressionInfo.h>
#include <Compression/CompressionFactory.h>
namespace DB
{
CompressionCodecNone::CompressionCodecNone()
{
setCodecDescription("NONE");
}
uint8_t CompressionCodecNone::getMethodByte() const
{
return static_cast<uint8_t>(CompressionMethodByte::NONE);
}
void CompressionCodecNone::updateHash(SipHash & hash) const
{
getCodecDesc()->updateTreeHash(hash, /*ignore_aliases=*/ true);
}
UInt32 CompressionCodecNone::doCompressData(const char * source, UInt32 source_size, char * dest) const
{
memcpy(dest, source, source_size);
return source_size;
}
void CompressionCodecNone::doDecompressData(const char * source, UInt32 source_size, char * dest, UInt32 uncompressed_size) const
{
if (source_size != uncompressed_size)
throw Exception(decompression_error_code, "Wrong data for compression codec NONE: source_size ({}) != uncompressed_size ({})",
source_size, uncompressed_size);
memcpy(dest, source, uncompressed_size);
}
void registerCodecNone(CompressionCodecFactory & factory)
{
factory.registerSimpleCompressionCodec("NONE", static_cast<char>(CompressionMethodByte::NONE), [&] ()
{
return std::make_shared<CompressionCodecNone>();
});
}
}