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Bring ZLib in locally. (#132)

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Kamron Batman 2020-05-06 20:07:28 -07:00 • committed by GitHub
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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Server.Compression
{
public static class ZLib
{
public static readonly ICompressor Compressor;
static ZLib()
{
if (RuntimeUtility.IsUnix)
Compressor = new UnixCompressor();
else
Compressor = new Compressor();
}
public static int MaxPackSize(int sourceLength) => (int)Compressor.CompressBound((ulong)sourceLength);
public static unsafe ZLibError Pack(Span<byte> dest, ref int destLength, ReadOnlySpan<byte> source, int sourceLength)
{
var destLengthLong = (ulong)destLength;
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
var e = Compressor.Compress(Unsafe.AsRef<int>(dPtr), ref destLengthLong, Unsafe.AsRef<int>(sPtr),
(ulong)sourceLength);
destLength = (int)destLengthLong;
return e;
}
}
public static unsafe ZLibError Pack(Span<byte> dest, ref int destLength, ReadOnlySpan<byte> source, ZLibQuality quality)
{
var destLengthLong = (ulong)destLength;
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
var e = Compressor.Compress(Unsafe.AsRef<int>(dPtr), ref destLengthLong, Unsafe.AsRef<int>(sPtr),
(ulong)source.Length, quality);
destLength = (int)destLengthLong;
return e;
}
}
public static unsafe ZLibError Pack(Span<byte> dest, ref int destLength, ReadOnlySpan<byte> source, int sourceLength,
ZLibQuality quality)
{
var destLengthLong = (ulong)destLength;
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
var e = Compressor.Compress(Unsafe.AsRef<int>(dPtr), ref destLengthLong, Unsafe.AsRef<int>(sPtr),
(ulong)sourceLength, quality);
destLength = (int)destLengthLong;
return e;
}
}
public static unsafe ZLibError Unpack(Span<byte> dest, ref int destLength, ReadOnlySpan<byte> source, int sourceLength)
{
var destLengthLong = (ulong)destLength;
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
var e = Compressor.Decompress(Unsafe.AsRef<int>(dPtr), ref destLengthLong, Unsafe.AsRef<int>(sPtr),
(ulong)sourceLength);
destLength = (int)destLengthLong;
return e;
}
}
public static ulong MaxPackSize(ulong sourceLength) => Compressor.CompressBound(sourceLength);
public static unsafe ZLibError Pack(Span<byte> dest, ref ulong destLength, ReadOnlySpan<byte> source, ulong sourceLength)
{
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
return Compressor.Compress(Unsafe.AsRef<int>(dPtr), ref destLength, Unsafe.AsRef<int>(sPtr), sourceLength);
}
}
public static unsafe ZLibError Pack(Span<byte> dest, ref ulong destLength, ReadOnlySpan<byte> source,
ZLibQuality quality)
{
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
return Compressor.Compress(Unsafe.AsRef<int>(dPtr), ref destLength, Unsafe.AsRef<int>(sPtr), (ulong)source.Length,
quality);
}
}
public static unsafe ZLibError Pack(Span<byte> dest, ref ulong destLength, ReadOnlySpan<byte> source, ulong sourceLength,
ZLibQuality quality)
{
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
return Compressor.Compress(Unsafe.AsRef<int>(dPtr), ref destLength, Unsafe.AsRef<int>(sPtr), sourceLength, quality);
}
}
public static unsafe ZLibError Unpack(Span<byte> dest, ref ulong destLength, ReadOnlySpan<byte> source,
ulong sourceLength)
{
fixed (byte* dPtr = &MemoryMarshal.GetReference(dest), sPtr = &MemoryMarshal.GetReference(source))
{
return Compressor.Decompress(Unsafe.AsRef<int>(dPtr), ref destLength, Unsafe.AsRef<int>(sPtr), sourceLength);
}
}
}
public interface ICompressor
{
string Version { get; }
ZLibError Compress(in int dest, ref ulong destLength, in int source, ulong sourceLength);
ZLibError Compress(in int dest, ref ulong destLength, in int source, ulong sourceLength, ZLibQuality quality);
ZLibError Decompress(in int dest, ref ulong destLength, in int source, ulong sourceLength);
ulong CompressBound(ulong sourceLength);
}
public class Compressor : ICompressor
{
public string Version => SafeNativeMethods.zlibVersion();
public ZLibError Compress(in int dest, ref ulong destLength, in int source, ulong sourceLength) =>
SafeNativeMethods.compress(dest, ref destLength, source, sourceLength);
public ZLibError Compress(in int dest, ref ulong destLength, in int source, ulong sourceLength,
ZLibQuality quality) => SafeNativeMethods.compress2(dest, ref destLength, source, sourceLength, quality);
public ZLibError Decompress(in int dest, ref ulong destLength, in int source, ulong sourceLength) =>
SafeNativeMethods.uncompress(dest, ref destLength, source, sourceLength);
public ulong CompressBound(ulong sourceLength) => SafeNativeMethods.compressBound(sourceLength);
private static class SafeNativeMethods
{
[DllImport("zlib", CharSet = CharSet.Unicode)]
internal static extern string zlibVersion();
[DllImport("zlib")]
internal static extern ZLibError compress(in int dest, ref ulong destLength, in int source, ulong sourceLength);
[DllImport("zlib")]
internal static extern ZLibError compress2(in int dest, ref ulong destLength, in int source, ulong sourceLength,
ZLibQuality quality);
[DllImport("zlib")]
internal static extern ZLibError uncompress(in int dest, ref ulong destLength, in int source, ulong sourceLength);
[DllImport("zlib")]
internal static extern ulong compressBound(ulong sourceLen);
}
}
public class UnixCompressor : ICompressor
{
public string Version => SafeNativeMethods.zlibVersion();
public ZLibError Compress(in int dest, ref ulong destLength, in int source, ulong sourceLength) =>
SafeNativeMethods.compress(dest, ref destLength, source, sourceLength);
public ZLibError Compress(in int dest, ref ulong destLength, in int source, ulong sourceLength,
ZLibQuality quality) => SafeNativeMethods.compress2(dest, ref destLength, source, sourceLength, quality);
public ZLibError Decompress(in int dest, ref ulong destLength, in int source, ulong sourceLength) =>
SafeNativeMethods.uncompress(dest, ref destLength, source, sourceLength);
public ulong CompressBound(ulong sourceLength) => SafeNativeMethods.compressBound(sourceLength);
internal static class SafeNativeMethods
{
[DllImport("libz", CharSet = CharSet.Unicode)]
internal static extern string zlibVersion();
[DllImport("libz")]
internal static extern ZLibError compress(in int dest, ref ulong destLength, in int source, ulong sourceLength);
[DllImport("libz")]
internal static extern ZLibError compress2(in int dest, ref ulong destLength, in int source, ulong sourceLength,
ZLibQuality quality);
[DllImport("libz")]
internal static extern ZLibError uncompress(in int dest, ref ulong destLength, in int source, ulong sourceLength);
[DllImport("libz")]
internal static extern ulong compressBound(ulong sourceLen);
}
}
public enum ZLibError
{
VersionError = -6,
BufferError = -5,
MemoryError = -4,
DataError = -3,
StreamError = -2,
FileError = -1,
Okay = 0,
StreamEnd = 1,
NeedDictionary = 2
}
public enum ZLibQuality
{
Default = -1,
None = 0,
Speed = 1,
Size = 9
}
}