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An HTTP library for Java that provides a lightweight server (currently) and client (eventually) both with a goal of high-performance and simplicity

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/*
 * Copyright (c) 2022, FusionAuth, All Rights Reserved
 *
 * Licensed 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.fusionauth.http.body.request;

import io.fusionauth.http.ParseException;
import io.fusionauth.http.util.HTTPTools;

public enum ChunkedBodyState {
  ChunkSize {
    @Override
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      if (ch == '\r') {
        return ChunkSizeCR;
      } else if (HTTPTools.isHexadecimalCharacter(ch)) {
        return ChunkSize;
      }

      throw new ParseException();
    }
  },

  ChunkSizeCR {
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      if (ch == '\n') {
        return ChunkSizeLF;
      }

      throw new ParseException();
    }
  },

  ChunkSizeLF {
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      return Chunk;
    }
  },

  Chunk {
    @Override
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      if (bytesRead < length) {
        return Chunk;
      } else if (bytesRead == length && ch == '\r') {
        return ChunkCR;
      }

      throw new ParseException();
    }
  },

  ChunkCR {
    @Override
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      if (ch == '\n') {
        return length == 0 ? Complete : ChunkLF;
      }

      throw new ParseException();
    }
  },

  ChunkLF {
    @Override
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      if (length == 0) {
        return Complete;
      } else if (HTTPTools.isHexadecimalCharacter(ch)) {
        return ChunkSize;
      }

      throw new ParseException();
    }
  },

  Complete {
    @Override
    public ChunkedBodyState next(byte ch, long length, long bytesRead) {
      return null;
    }
  };

  public abstract ChunkedBodyState next(byte ch, long length, long bytesRead);
}