public static int EncodeHeader(Span <byte> buffer, int nameValueIdx, QPackFlags flags = QPackFlags.StaticIndex)
{
byte prefix, prefixMask;
switch (flags & FlagsIndexMask)
{
case QPackFlags.StaticIndex:
prefix = 0b1100_0000;
prefixMask = 0b1100_0000;
break;
case QPackFlags.DynamicIndex:
prefix = 0b1000_0000;
prefixMask = 0b1100_0000;
break;
case QPackFlags.DynamicIndexPostBase:
prefix = 0b0001_0000;
prefixMask = 0b1111_0000;
break;
default:
Debug.Fail($"Invalid {nameof(QPackFlags)}.");
throw new Exception();
}
return(EncodeInteger(buffer, nameValueIdx, prefix, prefixMask));
}
public static int EncodeHeader(Span <byte> buffer, string name, string value, Encoding valueEncoding, QPackFlags flags = QPackFlags.None)
{
byte[] data = Encoding.ASCII.GetBytes(name);
byte prefix;
if (!flags.HasFlag(QPackFlags.HuffmanEncodeName))
{
prefix = 0b0010_0000;
}
else
{
int len = HuffmanEncoder.GetEncodedLength(data);
byte[] huffmanData = new byte[len];
HuffmanEncoder.Encode(data, huffmanData);
data = huffmanData;
prefix = 0b0010_1000;
}
if (flags.HasFlag(QPackFlags.NeverIndexed))
{
prefix |= 0b0001_0000;
}
int bytesGenerated = 0;
// write name string header.
bytesGenerated += EncodeInteger(buffer, data.Length, prefix, 0b1111_1000);
// write name string.
data.AsSpan().CopyTo(buffer.Slice(bytesGenerated));
bytesGenerated += data.Length;
// write value string.
bytesGenerated += EncodeString(buffer.Slice(bytesGenerated), value, valueEncoding, flags.HasFlag(QPackFlags.HuffmanEncodeValue));
return(bytesGenerated);
}
public static int EncodeHeader(Span <byte> buffer, int nameIdx, string value, Encoding valueEncoding, QPackFlags flags = QPackFlags.StaticIndex)
{
byte prefix, prefixMask;
switch (flags & FlagsIndexMask)
{
case QPackFlags.StaticIndex:
prefix = 0b0101_0000;
prefixMask = 0b1111_0000;
if (flags.HasFlag(QPackFlags.NeverIndexed))
{
prefix |= 0b0010_0000;
}
break;
case QPackFlags.DynamicIndex:
prefix = 0b0100_0000;
prefixMask = 0b1111_0000;
if (flags.HasFlag(QPackFlags.NeverIndexed))
{
prefix |= 0b0010_0000;
}
break;
case QPackFlags.DynamicIndexPostBase:
prefix = 0b0000_0000;
prefixMask = 0b1111_1000;
if (flags.HasFlag(QPackFlags.NeverIndexed))
{
prefix |= 0b0000_1000;
}
break;
default:
Debug.Fail($"Invalid {nameof(QPackFlags)}.");
throw new Exception();
}
int nameLen = EncodeInteger(buffer, nameIdx, prefix, prefixMask);
int valueLen = EncodeString(buffer.Slice(nameLen), value, valueEncoding, flags.HasFlag(QPackFlags.HuffmanEncodeValue));
return(nameLen + valueLen);
}
