content: /*
   * Copyright 2021-2024 Aklivity Inc.
   *
   * Aklivity licenses this file to you under the Apache License,
   * version 2.0 (the "License"); you may not use this file except in compliance
   * with the License. You may obtain a copy of the License at:
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.aklivity.zilla.runtime.binding.http.internal.hpack;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import org.agrona.DirectBuffer;
  import org.agrona.MutableDirectBuffer;
  import org.agrona.concurrent.AtomicBuffer;
  import org.agrona.concurrent.UnsafeBuffer;
  
  import io.aklivity.zilla.runtime.binding.http.internal.types.Flyweight;
  
  /*
   * Flyweight for HPACK String Literal Representation
   *
   *   0   1   2   3   4   5   6   7
   * +---+---+---+---+---+---+---+---+
   * | H |    String Length (7+)     |
   * +---+---------------------------+
   * |  String Data (Length octets)  |
   * +-------------------------------+
   *
   */
  public class HpackStringFW extends Flyweight
  {
  
      private final HpackIntegerFW integerRO = new HpackIntegerFW(7);
      private final AtomicBuffer payloadRO = new UnsafeBuffer(new byte[0]);
  
      public boolean huffman()
      {
          return (buffer().getByte(offset()) & 0x80) != 0;
      }
  
      public DirectBuffer payload()
      {
          return payloadRO;
      }
  
      public boolean error()
      {
          return integerRO.error() || integerRO.limit() + integerRO.integer() > maxLimit();
      }
  
      @Override
      public int limit()
      {
          return error() ? maxLimit() : integerRO.limit() + integerRO.integer();
      }
  
      @Override
      public HpackStringFW wrap(DirectBuffer buffer, int offset, int maxLimit)
      {
          super.wrap(buffer, offset, maxLimit);
  
          integerRO.wrap(buffer, offset, maxLimit);
          if (!error())
          {
              payloadRO.wrap(buffer, integerRO.limit(), integerRO.integer());
          }
          checkLimit(limit(), maxLimit);
          return this;
      }
  
      public static final class Builder extends Flyweight.Builder<HpackStringFW>
      {
          private final HpackIntegerFW.Builder integerRW = new HpackIntegerFW.Builder(7);
  
          public Builder()
          {
              super(new HpackStringFW());
          }
  
          @Override
          public HpackStringFW.Builder wrap(MutableDirectBuffer buffer, int offset, int maxLimit)
          {
              super.wrap(buffer, offset, maxLimit);
              buffer().putByte(offset(), (byte) 0x00);
              integerRW.wrap(buffer(), offset(), maxLimit());
              return this;
          }
  
          public HpackStringFW.Builder huffman()
          {
              throw new UnsupportedOperationException("TODO");
          }
  
          public HpackStringFW.Builder string(DirectBuffer value, int offset, int length)
          {
              integerRW.integer(length);
              buffer().putBytes(integerRW.limit(), value, offset, length);
              limit(integerRW.limit() + length);
  
              return this;
          }
  
          public HpackStringFW.Builder string(String str)
          {
              byte[] bytes = str.getBytes(UTF_8);
              integerRW.integer(bytes.length);
              buffer().putBytes(integerRW.limit(), bytes);
              limit(integerRW.limit() + bytes.length);
  
              return this;
          }
  
      }
  
  }
  