private static void WriteKeyName(WritableBuffer buffer, Header header, ref HeaderTable headerTable, byte preamble, int n)
{
var nameIndex = headerTable.GetKey(header.Name);
WriteUInt32(buffer, nameIndex, preamble, n);
if (nameIndex == 0)
{
WriteNameString(buffer, header.Name, header.Options);
}
}
public static void WriteHeader(WritableBuffer buffer, Header header, ref HeaderTable headerTable, MemoryPool memoryPool)
{
switch (header.Options & HeaderOptions.IndexMask)
{
case HeaderOptions.IndexAddNewValue:
WriteKeyName(buffer, header, ref headerTable, 0x40, 6);
WriteValueString(buffer, header.Value, header.Options);
headerTable = headerTable.Add(header, memoryPool);
break;
case HeaderOptions.IndexExistingValue:
var index = headerTable.GetKey(header.Name, header.Value);
if (index == 0)
{
throw new InvalidOperationException("Attempted to use a header that did not exist: " + header.ToString() + Environment.NewLine + headerTable.ToString());
}
WriteUInt32(buffer, index, 0x80, 7);
break;
case HeaderOptions.IndexNeverIndexed:
WriteKeyName(buffer, header, ref headerTable, 0x10, 4);
WriteValueString(buffer, header.Value, header.Options);
break;
case HeaderOptions.IndexNotIndexed:
WriteKeyName(buffer, header, ref headerTable, 0x00, 4);
WriteValueString(buffer, header.Value, header.Options);
break;
case HeaderOptions.IndexResize:
uint len;
if (!uint.TryParse(header.Value, out len))
{
throw new InvalidOperationException("Invalid index length change: " + header.Value);
}
WriteUInt32(buffer, len, 0x20, 5);
break;
case HeaderOptions.IndexAutomatic:
index = headerTable.GetKey(header.Name, header.Value);
if (index == 0)
{
index = headerTable.GetKey(header.Name);
switch (index)
{
case 1: // :authority
case 15: // accept-charset
case 16: // accept-encoding
case 17: // accept-language
case 38: // host
case 58: // user-agent
// AddNewValue
WriteUInt32(buffer, index, 0x40, 6);
headerTable = headerTable.Add(header, memoryPool);
break;
default:
// NotIndexed
WriteUInt32(buffer, index, 0x00, 4);
if (index == 0)
{
WriteNameString(buffer, header.Name, header.Options);
}
break;
}
WriteValueString(buffer, header.Value, header.Options);
}
else
{
// ExistingValue
WriteUInt32(buffer, index, 0x80, 7);
}
break;
default:
throw new InvalidOperationException("Invalid header indexing: " + header.Options);
}
}