decodeBase() — netty Function Reference

Architecture documentation for the decodeBase() function in QpackDecoder.java from the netty codebase.

Function java Buffer Allocators called by 1

Entity Profile

Buffer→ Allocators→ decodeBase() — netty Function Reference

Dependency Diagram

graph TD
  798116b5_14c9_bfbb_a4c9_98f7cdad82a3["decodeBase()"]
  90fa2d3f_8d04_4c74_e2ce_52229be77194["QpackDecoder"]
  798116b5_14c9_bfbb_a4c9_98f7cdad82a3 -->|defined in| 90fa2d3f_8d04_4c74_e2ce_52229be77194
  678f973e_104e_7340_6c3b_b4ef23003fe0["decode()"]
  678f973e_104e_7340_6c3b_b4ef23003fe0 -->|calls| 798116b5_14c9_bfbb_a4c9_98f7cdad82a3
  style 798116b5_14c9_bfbb_a4c9_98f7cdad82a3 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

codec-http3/src/main/java/io/netty/handler/codec/http3/QpackDecoder.java lines 460–475

    int decodeBase(ByteBuf buf, int requiredInsertCount) throws QpackException {
        // https://www.rfc-editor.org/rfc/rfc9204.html#name-encoded-field-section-prefi
        //   0   1   2   3   4   5   6   7
        // +---+---------------------------+
        // | S |      Delta Base (7+)      |
        // +---+---------------------------+
        final boolean s = (buf.getByte(buf.readerIndex()) & 0b1000_0000) == 0b1000_0000;
        final int deltaBase = decodePrefixedIntegerAsInt(buf, 7);
        assert deltaBase >= 0;
        // https://www.rfc-editor.org/rfc/rfc9204.html#name-base
        //    if S == 0:
        //      Base = ReqInsertCount + DeltaBase
        //   else:
        //      Base = ReqInsertCount - DeltaBase - 1
        return s ? requiredInsertCount - deltaBase - 1 : requiredInsertCount + deltaBase;
    }