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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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 org.openqa.selenium.server;

import org.openqa.jetty.util.IO;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

public class ModifiedIO {
  /**
   * Copy Stream in to Stream out until EOF or exception.
   */
  public static long copy(InputStream in, OutputStream out)
      throws IOException {
    return copy(in, out, -1);
  }

  public static long copy(Reader in, Writer out)
      throws IOException {
    return copy(in, out, -1);
  }

  /**
   * Copy Stream in to Stream for byteCount bytes or until EOF or exception.
   *
   * @return Copied bytes count or -1 if no bytes were read *and* EOF was reached
   */
  public static long copy(InputStream in,
                          OutputStream out,
                          long byteCount)
      throws IOException {
    byte buffer[] = new byte[IO.bufferSize];
    int len;

    long returnVal = 0;

    if (byteCount >= 0) {
      while (byteCount > 0) {
        if (byteCount < IO.bufferSize)
          len = in.read(buffer, 0, (int) byteCount);
        else
          len = in.read(buffer, 0, IO.bufferSize);

        if (len == -1) {
          break;
        }
        returnVal += len;

        byteCount -= len;
        out.write(buffer, 0, len);
      }
    } else {
      while (true) {
        len = in.read(buffer, 0, IO.bufferSize);
        if (len < 0) {
          break;
        }
        returnVal += len;
        out.write(buffer, 0, len);
      }
    }

    return returnVal;
  }

  /**
   * Copy Reader to Writer for byteCount bytes or until EOF or exception.
   */
  public static long copy(Reader in,
                          Writer out,
                          long byteCount)
      throws IOException {
    char buffer[] = new char[IO.bufferSize];
    int len;

    long returnVal = 0;

    if (byteCount >= 0) {
      while (byteCount > 0) {
        if (byteCount < IO.bufferSize)
          len = in.read(buffer, 0, (int) byteCount);
        else
          len = in.read(buffer, 0, IO.bufferSize);

        if (len == -1) {
          break;
        }
        returnVal += len;

        byteCount -= len;
        out.write(buffer, 0, len);
      }
    } else {
      while (true) {
        len = in.read(buffer, 0, IO.bufferSize);
        if (len == -1) {
          break;
        }
        returnVal += len;
        out.write(buffer, 0, len);
      }
    }

    return returnVal;
  }

}