encodeHeader() — netty Function Reference

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/HpackEncoder.java lines 161–205

    private void encodeHeader(ByteBuf out, CharSequence name, CharSequence value, boolean sensitive, long headerSize) {
        // If the header value is sensitive then it must never be indexed
        if (sensitive) {
            int nameIndex = getNameIndex(name);
            encodeLiteral(out, name, value, IndexType.NEVER, nameIndex);
            return;
        }

        // If the peer will only use the static table
        if (maxHeaderTableSize == 0) {
            int staticTableIndex = HpackStaticTable.getIndexInsensitive(name, value);
            if (staticTableIndex == HpackStaticTable.NOT_FOUND) {
                int nameIndex = HpackStaticTable.getIndex(name);
                encodeLiteral(out, name, value, IndexType.NONE, nameIndex);
            } else {
                encodeInteger(out, 0x80, 7, staticTableIndex);
            }
            return;
        }

        // If the headerSize is greater than the max table size then it must be encoded literally
        if (headerSize > maxHeaderTableSize) {
            int nameIndex = getNameIndex(name);
            encodeLiteral(out, name, value, IndexType.NONE, nameIndex);
            return;
        }

        int nameHash = AsciiString.hashCode(name);
        int valueHash = AsciiString.hashCode(value);
        NameValueEntry headerField = getEntryInsensitive(name, nameHash, value, valueHash);
        if (headerField != null) {
            // Section 6.1. Indexed Header Field Representation
            encodeInteger(out, 0x80, 7, getIndexPlusOffset(headerField.counter));
        } else {
            int staticTableIndex = HpackStaticTable.getIndexInsensitive(name, value);
            if (staticTableIndex != HpackStaticTable.NOT_FOUND) {
                // Section 6.1. Indexed Header Field Representation
                encodeInteger(out, 0x80, 7, staticTableIndex);
            } else {
                ensureCapacity(headerSize);
                encodeAndAddEntries(out, name, nameHash, value, valueHash);
                size += headerSize;
            }
        }
    }