List encode()

in lib/src/hpack/hpack.dart [175:220]

• 38 lines of code
• 5 McCabe index (conditional complexity)

  List<int> encode(List<Header> headers) {
    var bytesBuilder = BytesBuilder();
    var currentByte = 0;

    void writeInteger(int prefixBits, int value) {
      assert(prefixBits <= 8);

      if (value < (1 << prefixBits) - 1) {
        currentByte |= value;
        bytesBuilder.addByte(currentByte);
      } else {
        // Length encodeded.
        currentByte |= (1 << prefixBits) - 1;
        value -= (1 << prefixBits) - 1;
        bytesBuilder.addByte(currentByte);
        var done = false;
        while (!done) {
          currentByte = value & 0x7f;
          value = value >> 7;
          done = value == 0;
          if (!done) currentByte |= 0x80;
          bytesBuilder.addByte(currentByte);
        }
      }
      currentByte = 0;
    }

    void writeStringLiteral(List<int> bytes) {
      // TODO: Support huffman encoding.
      currentByte = 0; // 1 would be huffman encoding
      writeInteger(7, bytes.length);
      bytesBuilder.add(bytes);
    }

    void writeLiteralHeaderWithoutIndexing(Header header) {
      bytesBuilder.addByte(0);
      writeStringLiteral(header.name);
      writeStringLiteral(header.value);
    }

    for (var header in headers) {
      writeLiteralHeaderWithoutIndexing(header);
    }

    return bytesBuilder.takeBytes();
  }