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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.handler.codec.http.multipart;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.CompositeByteBuf;
  import io.netty.handler.codec.http.HttpConstants;
  import io.netty.util.internal.ObjectUtil;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.RandomAccessFile;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  import java.nio.charset.Charset;
  
  import static io.netty.buffer.Unpooled.EMPTY_BUFFER;
  import static io.netty.buffer.Unpooled.buffer;
  import static io.netty.buffer.Unpooled.compositeBuffer;
  import static io.netty.buffer.Unpooled.wrappedBuffer;
  
  /**
   * Abstract Memory HttpData implementation
   */
  public abstract class AbstractMemoryHttpData extends AbstractHttpData {
  
      private ByteBuf byteBuf;
      private int chunkPosition;
  
      protected AbstractMemoryHttpData(String name, Charset charset, long size) {
          super(name, charset, size);
          byteBuf = EMPTY_BUFFER;
      }
  
      @Override
      public void setContent(ByteBuf buffer) throws IOException {
          ObjectUtil.checkNotNull(buffer, "buffer");
          long localsize = buffer.readableBytes();
          try {
              checkSize(localsize);
          } catch (IOException e) {
              buffer.release();
              throw e;
          }
          if (definedSize > 0 && definedSize < localsize) {
              buffer.release();
              throw new IOException("Out of size: " + localsize + " > " +
                      definedSize);
          }
          if (byteBuf != null) {
              byteBuf.release();
          }
          byteBuf = buffer;
          size = localsize;
          setCompleted();
      }
  
      @Override
      public void setContent(InputStream inputStream) throws IOException {
          ObjectUtil.checkNotNull(inputStream, "inputStream");
  
          byte[] bytes = new byte[4096 * 4];
          ByteBuf buffer = buffer();
          int written = 0;
          try {
              int read = inputStream.read(bytes);
              while (read > 0) {
                  buffer.writeBytes(bytes, 0, read);
                  written += read;
                  checkSize(written);
                  read = inputStream.read(bytes);
              }
          } catch (IOException e) {
              buffer.release();
              throw e;
          }
          size = written;
          if (definedSize > 0 && definedSize < size) {
              buffer.release();
              throw new IOException("Out of size: " + size + " > " + definedSize);
          }
          if (byteBuf != null) {
              byteBuf.release();
          }
          byteBuf = buffer;
         setCompleted();
     }
 
     @Override
     public void addContent(ByteBuf buffer, boolean last)
             throws IOException {
         if (buffer != null) {
             long localsize = buffer.readableBytes();
             try {
                 checkSize(size + localsize);
             } catch (IOException e) {
                 buffer.release();
                 throw e;
             }
             if (definedSize > 0 && definedSize < size + localsize) {
                 buffer.release();
                 throw new IOException("Out of size: " + (size + localsize) +
                         " > " + definedSize);
             }
             size += localsize;
             if (byteBuf == null) {
                 byteBuf = buffer;
             } else if (localsize == 0) {
                 // Nothing to add and byteBuf already exists
                 buffer.release();
             } else if (byteBuf.readableBytes() == 0) {
                 // Previous buffer is empty, so just replace it
                 byteBuf.release();
                 byteBuf = buffer;
             } else if (byteBuf instanceof CompositeByteBuf) {
                 CompositeByteBuf cbb = (CompositeByteBuf) byteBuf;
                 cbb.addComponent(true, buffer);
             } else {
                 CompositeByteBuf cbb = compositeBuffer(Integer.MAX_VALUE);
                 cbb.addComponents(true, byteBuf, buffer);
                 byteBuf = cbb;
             }
         }
         if (last) {
             setCompleted();
         } else {
             ObjectUtil.checkNotNull(buffer, "buffer");
         }
     }
 
     @Override
     public void setContent(File file) throws IOException {
         ObjectUtil.checkNotNull(file, "file");
 
         long newsize = file.length();
         if (newsize > Integer.MAX_VALUE) {
             throw new IllegalArgumentException("File too big to be loaded in memory");
         }
         checkSize(newsize);
         RandomAccessFile accessFile = new RandomAccessFile(file, "r");
         ByteBuffer byteBuffer;
         try {
             FileChannel fileChannel = accessFile.getChannel();
             try {
                 byte[] array = new byte[(int) newsize];
                 byteBuffer = ByteBuffer.wrap(array);
                 int read = 0;
                 while (read < newsize) {
                     read += fileChannel.read(byteBuffer);
                 }
             } finally {
                 fileChannel.close();
             }
         } finally {
             accessFile.close();
         }
         byteBuffer.flip();
         if (byteBuf != null) {
             byteBuf.release();
         }
         byteBuf = wrappedBuffer(Integer.MAX_VALUE, byteBuffer);
         size = newsize;
         setCompleted();
     }
 
     @Override
     public void delete() {
         if (byteBuf != null) {
             byteBuf.release();
             byteBuf = null;
         }
     }
 
     @Override
     public byte[] get() {
         if (byteBuf == null) {
             return EMPTY_BUFFER.array();
         }
         byte[] array = new byte[byteBuf.readableBytes()];
         byteBuf.getBytes(byteBuf.readerIndex(), array);
         return array;
     }
 
     @Override
     public String getString() {
         return getString(HttpConstants.DEFAULT_CHARSET);
     }
 
     @Override
     public String getString(Charset encoding) {
         if (byteBuf == null) {
             return "";
         }
         if (encoding == null) {
             encoding = HttpConstants.DEFAULT_CHARSET;
         }
         return byteBuf.toString(encoding);
     }
 
     /**
      * Utility to go from a In Memory FileUpload
      * to a Disk (or another implementation) FileUpload
      * @return the attached ByteBuf containing the actual bytes
      */
     @Override
     public ByteBuf getByteBuf() {
         return byteBuf;
     }
 
     @Override
     public ByteBuf getChunk(int length) throws IOException {
         if (byteBuf == null || length == 0 || byteBuf.readableBytes() == 0) {
             chunkPosition = 0;
             return EMPTY_BUFFER;
         }
         int sizeLeft = byteBuf.readableBytes() - chunkPosition;
         if (sizeLeft == 0) {
             chunkPosition = 0;
             return EMPTY_BUFFER;
         }
         int sliceLength = length;
         if (sizeLeft < length) {
             sliceLength = sizeLeft;
         }
         ByteBuf chunk = byteBuf.retainedSlice(chunkPosition, sliceLength);
         chunkPosition += sliceLength;
         return chunk;
     }
 
     @Override
     public boolean isInMemory() {
         return true;
     }
 
     @Override
     public boolean renameTo(File dest) throws IOException {
         ObjectUtil.checkNotNull(dest, "dest");
         if (byteBuf == null) {
             // empty file
             if (!dest.createNewFile()) {
                 throw new IOException("file exists already: " + dest);
             }
             return true;
         }
         int length = byteBuf.readableBytes();
         long written = 0;
         RandomAccessFile accessFile = new RandomAccessFile(dest, "rw");
         try {
             FileChannel fileChannel = accessFile.getChannel();
             try {
                 if (byteBuf.nioBufferCount() == 1) {
                     ByteBuffer byteBuffer = byteBuf.nioBuffer();
                     while (written < length) {
                         written += fileChannel.write(byteBuffer);
                     }
                 } else {
                     ByteBuffer[] byteBuffers = byteBuf.nioBuffers();
                     while (written < length) {
                         written += fileChannel.write(byteBuffers);
                     }
                 }
                 fileChannel.force(false);
             } finally {
                 fileChannel.close();
             }
         } finally {
             accessFile.close();
         }
         return written == length;
     }
 
     @Override
     public File getFile() throws IOException {
         throw new IOException("Not represented by a file");
     }
 
     @Override
     public HttpData touch() {
         return touch(null);
     }
 
     @Override
     public HttpData touch(Object hint) {
         if (byteBuf != null) {
             byteBuf.touch(hint);
         }
         return this;
     }
 }