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using System.IO;
#if NET6_0_OR_GREATER
using System.IO.Compression;
#else
using Org.BouncyCastle.Utilities.Zlib;
#endif
namespace Org.BouncyCastle.Utilities.IO.Compression
{
internal static class ZLib
{
internal static Stream CompressOutput(Stream stream, int zlibCompressionLevel, bool leaveOpen = false)
{
#if NET6_0_OR_GREATER
return new ZLibStream(stream, GetCompressionLevel(zlibCompressionLevel), leaveOpen);
#else
return leaveOpen
? new ZOutputStreamLeaveOpen(stream, zlibCompressionLevel, false)
: new ZOutputStream(stream, zlibCompressionLevel, false);
#endif
}
internal static Stream DecompressInput(Stream stream)
{
#if NET6_0_OR_GREATER
return new ZLibStream(stream, CompressionMode.Decompress, leaveOpen: false);
#else
return new ZInputStream(stream);
#endif
}
#if NET6_0_OR_GREATER
internal static CompressionLevel GetCompressionLevel(int zlibCompressionLevel)
{
return zlibCompressionLevel switch
{
0 => CompressionLevel.NoCompression,
1 or 2 or 3 => CompressionLevel.Fastest,
7 or 8 or 9 => CompressionLevel.SmallestSize,
_ => CompressionLevel.Optimal,
};
}
#endif
}
}
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