/// <summary>
/// Add the header field to the dynamic table.
/// Entries are evicted from the dynamic table until the size of the table
/// and the new header field is less than the table's capacity.
/// If the size of the new entry is larger than the table's capacity,
/// the dynamic table will be cleared.
/// </summary>
/// <param name="name">Name.</param>
/// <param name="value">Value.</param>
private void Add(byte[] name, byte[] value)
{
int headerSize = HeaderField.SizeOf(name, value);
// Clear the table if the header field size is larger than the capacity.
if (headerSize > this.capacity)
{
this.Clear();
return;
}
// Evict oldest entries until we have enough capacity.
while (this.size + headerSize > this.capacity)
{
this.Remove();
}
// Copy name and value that modifications of original do not affect the dynamic table.
name.CopyTo(name, 0);
value.CopyTo(value, 0);
int h = Encoder.Hash(name);
int i = Encoder.Index(h);
HeaderEntry old = headerFields[i];
HeaderEntry e = new HeaderEntry(h, name, value, head.Before.Index - 1, old);
headerFields[i] = e;
e.AddBefore(head);
this.size += headerSize;
}
/// <summary>
/// Encode the header field into the header block.
/// </summary>
/// <param name="output">Output.</param>
/// <param name="name">Name.</param>
/// <param name="value">Value.</param>
/// <param name="sensitive">If set to <c>true</c> sensitive.</param>
public void EncodeHeader(BinaryWriter output, byte[] name, byte[] value, bool sensitive)
{
// If the header value is sensitive then it must never be indexed
if (sensitive)
{
int nameIndex = this.GetNameIndex(name);
this.EncodeLiteral(output, name, value, HPackUtil.IndexType.NEVER, nameIndex);
return;
}
// If the peer will only use the static table
if (this.capacity == 0)
{
int staticTableIndex = StaticTable.GetIndex(name, value);
if (staticTableIndex == -1)
{
int nameIndex = StaticTable.GetIndex(name);
this.EncodeLiteral(output, name, value, HPackUtil.IndexType.NONE, nameIndex);
}
else
{
Encoder.EncodeInteger(output, 0x80, 7, staticTableIndex);
}
return;
}
int headerSize = HeaderField.SizeOf(name, value);
// If the headerSize is greater than the max table size then it must be encoded literally
if (headerSize > this.capacity)
{
int nameIndex = this.GetNameIndex(name);
this.EncodeLiteral(output, name, value, HPackUtil.IndexType.NONE, nameIndex);
return;
}
HeaderEntry headerField = this.GetEntry(name, value);
if (headerField != null)
{
int index = this.GetIndex(headerField.Index) + StaticTable.Length;
// Section 6.1. Indexed Header Field Representation
Encoder.EncodeInteger(output, 0x80, 7, index);
}
else
{
int staticTableIndex = StaticTable.GetIndex(name, value);
if (staticTableIndex != -1)
{
// Section 6.1. Indexed Header Field Representation
Encoder.EncodeInteger(output, 0x80, 7, staticTableIndex);
}
else
{
int nameIndex = this.GetNameIndex(name);
if (useIndexing)
{
this.EnsureCapacity(headerSize);
}
var indexType = useIndexing ? HPackUtil.IndexType.INCREMENTAL : HPackUtil.IndexType.NONE;
this.EncodeLiteral(output, name, value, indexType, nameIndex);
if (useIndexing)
{
this.Add(name, value);
}
}
}
}