private static string DecodeUtf8Prefixed(byte *bytes, int byteCount, byte[] prefix, MetadataStringDecoder utf8Decoder)
{
Debug.Assert(utf8Decoder != null);
int prefixedByteCount = byteCount + prefix.Length;
if (prefixedByteCount == 0)
{
return(String.Empty);
}
byte[] buffer = AcquireBuffer(prefixedByteCount);
prefix.CopyTo(buffer, 0);
Marshal.Copy((IntPtr)bytes, buffer, prefix.Length, byteCount);
string result;
fixed(byte *prefixedBytes = buffer)
{
result = utf8Decoder.GetString(prefixedBytes, prefixedByteCount);
}
ReleaseBuffer(buffer);
return(result);
}
private static string DecodeUtf8Prefixed(byte *bytes, int byteCount, byte[] prefix, MetadataStringDecoder utf8Decoder)
{
Debug.Assert(utf8Decoder != null);
int prefixedByteCount = byteCount + prefix.Length;
if (prefixedByteCount == 0)
{
return(string.Empty);
}
byte[] buffer = ArrayPool <byte> .Shared.Rent(prefixedByteCount);
prefix.CopyTo(buffer, 0);
Marshal.Copy((IntPtr)bytes, buffer, prefix.Length, byteCount);
string result;
fixed(byte *prefixedBytes = &buffer[0])
{
result = utf8Decoder.GetString(prefixedBytes, prefixedByteCount);
}
ArrayPool <byte> .Shared.Return(buffer);
return(result);
}
public unsafe void LightUpTrickFromDifferentAssemblyWorks()
{
// This is a trick to use our portable light up outside the reader assembly (that
// I will use in Roslyn). Check that it works with encoding other than UTF8 and that it
// validates arguments like the the real thing.
var decoder = new MetadataStringDecoder(Encoding.Unicode);
Assert.Throws <ArgumentNullException>(() => decoder.GetString(null, 0));
Assert.Throws <ArgumentOutOfRangeException>(() => decoder.GetString((byte *)1, -1));
byte[] bytes;
fixed(byte *ptr = (bytes = Encoding.Unicode.GetBytes("\u00C7a marche tr\u00E8s bien.")))
{
Assert.Equal("\u00C7a marche tr\u00E8s bien.", decoder.GetString(ptr, bytes.Length));
}
}
public static string DecodeUtf8(byte *bytes, int byteCount, byte[] prefix, MetadataStringDecoder utf8Decoder)
{
Debug.Assert(utf8Decoder != null);
if (prefix != null)
{
return(DecodeUtf8Prefixed(bytes, byteCount, prefix, utf8Decoder));
}
if (byteCount == 0)
{
return(String.Empty);
}
return(utf8Decoder.GetString(bytes, byteCount));
}
public unsafe void LightUpTrickFromDifferentAssemblyWorks()
{
// This is a trick to use our portable light up outside the reader assembly (that
// I will use in Roslyn). Check that it works with encoding other than UTF8 and that it
// validates arguments like the the real thing.
var decoder = new MetadataStringDecoder(Encoding.Unicode);
Assert.Throws<ArgumentNullException>(() => decoder.GetString(null, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => decoder.GetString((byte*)1, -1));
byte[] bytes;
fixed (byte* ptr = (bytes = Encoding.Unicode.GetBytes("\u00C7a marche tr\u00E8s bien.")))
{
Assert.Equal("\u00C7a marche tr\u00E8s bien.", decoder.GetString(ptr, bytes.Length));
}
}