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Support writing ROOT files with LZ4 and ZSTD compression

Merged Support writing ROOT files with LZ4 and ZSTD compression
lhcb/Gaudi:cburr/zstd-and-lz4-compression into master
Merged Chris Burr requested to merge lhcb/Gaudi:cburr/zstd-and-lz4-compression into master
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RootCnv/src/RootDataConnection.cpp
+ 6
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@@ -128,6 +128,12 @@ StatusCode RootConnectionSetup::setCompression( std::string_view compression ) {
alg_code = ROOT::kZLIB;
else if ( alg.size() == 4 && strncasecmp( alg.data(), "LZMA", 4 ) == 0 )
alg_code = ROOT::kLZMA;
else if ( alg.size() == 3 && strncasecmp( alg.data(), "LZ4", 3 ) == 0 )
alg_code = ROOT::kLZ4;
# if ROOT_VERSION_CODE >= ROOT_VERSION( 6, 20, 0 )
else if ( alg.size() == 4 && strncasecmp( alg.data(), "ZSTD", 4 ) == 0 )
alg_code = ROOT::kZSTD;
# endif
else
throw runtime_error( "ERROR: request to set unknown ROOT compression algorithm:" + std::string{ alg } );
res = ::sscanf( std::string{ compression.substr( idx + 1 ) }.c_str(), "%d",