/*
    * 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.handler.codec.http.HttpConstants;
  import io.netty.handler.codec.http.HttpContent;
  import io.netty.handler.codec.http.HttpHeaderNames;
  import io.netty.handler.codec.http.HttpHeaderValues;
  import io.netty.handler.codec.http.HttpRequest;
  import io.netty.handler.codec.http.LastHttpContent;
  import io.netty.handler.codec.http.QueryStringDecoder;
  import io.netty.handler.codec.http.multipart.HttpPostBodyUtil.SeekAheadOptimize;
  import io.netty.handler.codec.http.multipart.HttpPostBodyUtil.TransferEncodingMechanism;
  import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.EndOfDataDecoderException;
  import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.ErrorDataDecoderException;
  import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.MultiPartStatus;
  import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.NotEnoughDataDecoderException;
  import io.netty.util.CharsetUtil;
  import io.netty.util.internal.EmptyArrays;
  import io.netty.util.internal.InternalThreadLocalMap;
  import io.netty.util.internal.PlatformDependent;
  import io.netty.util.internal.StringUtil;
  
  import java.io.IOException;
  import java.nio.charset.Charset;
  import java.nio.charset.IllegalCharsetNameException;
  import java.nio.charset.UnsupportedCharsetException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.TreeMap;
  
  import static io.netty.util.internal.ObjectUtil.*;
  
  /**
   * This decoder will decode Body and can handle POST BODY.
   *
   * You <strong>MUST</strong> call {@link #destroy()} after completion to release all resources.
   *
   */
  public class HttpPostMultipartRequestDecoder implements InterfaceHttpPostRequestDecoder {
  
      /**
       * Factory used to create InterfaceHttpData
       */
      private final HttpDataFactory factory;
  
      /**
       * Request to decode
       */
      private final HttpRequest request;
  
      /**
       * The maximum number of fields allows by the form
       */
      private final int maxFields;
  
      /**
       * The maximum number of accumulated bytes when decoding a field
       */
      private final int maxBufferedBytes;
  
      /**
       * Default charset to use
       */
      private Charset charset;
  
      /**
       * Does the last chunk already received
       */
      private boolean isLastChunk;
  
      /**
       * HttpDatas from Body
       */
      private final List<InterfaceHttpData> bodyListHttpData = new ArrayList<InterfaceHttpData>();
  
      /**
       * HttpDatas as Map from Body
       */
      private final Map<String, List<InterfaceHttpData>> bodyMapHttpData = new TreeMap<String, List<InterfaceHttpData>>(
              CaseIgnoringComparator.INSTANCE);
  
      /**
       * The current channelBuffer
      */
     private ByteBuf undecodedChunk;
 
     /**
      * Body HttpDatas current position
      */
     private int bodyListHttpDataRank;
 
     /**
      * If multipart, this is the boundary for the global multipart
      */
     private final String multipartDataBoundary;
 
     /**
      * If multipart, there could be internal multiparts (mixed) to the global
      * multipart. Only one level is allowed.
      */
     private String multipartMixedBoundary;
 
     /**
      * Current getStatus
      */
     private MultiPartStatus currentStatus = MultiPartStatus.NOTSTARTED;
 
     /**
      * Used in Multipart
      */
     private Map<CharSequence, Attribute> currentFieldAttributes;
 
     /**
      * The current FileUpload that is currently in decode process
      */
     private FileUpload currentFileUpload;
 
     /**
      * The current Attribute that is currently in decode process
      */
     private Attribute currentAttribute;
 
     private boolean destroyed;
 
     private int discardThreshold = HttpPostRequestDecoder.DEFAULT_DISCARD_THRESHOLD;
 
     /**
      *
      * @param request
      *            the request to decode
      * @throws NullPointerException
      *             for request
      * @throws ErrorDataDecoderException
      *             if the default charset was wrong when decoding or other
      *             errors
      */
     public HttpPostMultipartRequestDecoder(HttpRequest request) {
         this(new DefaultHttpDataFactory(DefaultHttpDataFactory.MINSIZE), request, HttpConstants.DEFAULT_CHARSET);
     }
 
     /**
      *
      * @param factory
      *            the factory used to create InterfaceHttpData
      * @param request
      *            the request to decode
      * @throws NullPointerException
      *             for request or factory
      * @throws ErrorDataDecoderException
      *             if the default charset was wrong when decoding or other
      *             errors
      */
     public HttpPostMultipartRequestDecoder(HttpDataFactory factory, HttpRequest request) {
         this(factory, request, HttpConstants.DEFAULT_CHARSET);
     }
 
     /**
      *
      * @param factory
      *            the factory used to create InterfaceHttpData
      * @param request
      *            the request to decode
      * @param charset
      *            the charset to use as default
      * @throws NullPointerException
      *             for request or charset or factory
      * @throws ErrorDataDecoderException
      *             if the default charset was wrong when decoding or other
      *             errors
      */
     public HttpPostMultipartRequestDecoder(HttpDataFactory factory, HttpRequest request, Charset charset) {
         this(factory, request, charset, HttpPostRequestDecoder.DEFAULT_MAX_FIELDS,
                 HttpPostRequestDecoder.DEFAULT_MAX_BUFFERED_BYTES);
     }
 
     /**
      *
      * @param factory
      *            the factory used to create InterfaceHttpData
      * @param request
      *            the request to decode
      * @param charset
      *            the charset to use as default
      * @param maxFields
      *            the maximum number of fields the form can have, {@code -1} to disable
      * @param maxBufferedBytes
      *            the maximum number of bytes the decoder can buffer when decoding a field, {@code -1} to disable
      * @throws NullPointerException
      *             for request or charset or factory
      * @throws ErrorDataDecoderException
      *             if the default charset was wrong when decoding or other
      *             errors
      */
     public HttpPostMultipartRequestDecoder(HttpDataFactory factory, HttpRequest request, Charset charset,
                                            int maxFields, int maxBufferedBytes) {
         this.request = checkNotNull(request, "request");
         this.charset = checkNotNull(charset, "charset");
         this.factory = checkNotNull(factory, "factory");
         this.maxFields = maxFields;
         this.maxBufferedBytes = maxBufferedBytes;
         // Fill default values
 
         String contentTypeValue = this.request.headers().get(HttpHeaderNames.CONTENT_TYPE);
         if (contentTypeValue == null) {
             throw new ErrorDataDecoderException("No '" + HttpHeaderNames.CONTENT_TYPE + "' header present.");
         }
 
         String[] dataBoundary = HttpPostRequestDecoder.getMultipartDataBoundary(contentTypeValue);
         if (dataBoundary != null) {
             multipartDataBoundary = dataBoundary[0];
             if (dataBoundary.length > 1 && dataBoundary[1] != null) {
                 try {
                     this.charset = Charset.forName(dataBoundary[1]);
                 } catch (IllegalCharsetNameException e) {
                     throw new ErrorDataDecoderException(e);
                 }
             }
         } else {
             multipartDataBoundary = null;
         }
         currentStatus = MultiPartStatus.HEADERDELIMITER;
 
         try {
             if (request instanceof HttpContent) {
                 // Offer automatically if the given request is als type of HttpContent
                 // See #1089
                 offer((HttpContent) request);
             } else {
                 parseBody();
             }
         } catch (Throwable e) {
             destroy();
             PlatformDependent.throwException(e);
         }
     }
 
     private void checkDestroyed() {
         if (destroyed) {
             throw new IllegalStateException(HttpPostMultipartRequestDecoder.class.getSimpleName()
                     + " was destroyed already");
         }
     }
 
     /**
      * True if this request is a Multipart request
      *
      * @return True if this request is a Multipart request
      */
     @Override
     public boolean isMultipart() {
         checkDestroyed();
         return true;
     }
 
     /**
      * Set the amount of bytes after which read bytes in the buffer should be discarded.
      * Setting this lower gives lower memory usage but with the overhead of more memory copies.
      * Use {@code 0} to disable it.
      */
     @Override
     public void setDiscardThreshold(int discardThreshold) {
         this.discardThreshold = checkPositiveOrZero(discardThreshold, "discardThreshold");
     }
 
     /**
      * Return the threshold in bytes after which read data in the buffer should be discarded.
      */
     @Override
     public int getDiscardThreshold() {
         return discardThreshold;
     }
 
     /**
      * This getMethod returns a List of all HttpDatas from body.<br>
      *
      * If chunked, all chunks must have been offered using offer() getMethod. If
      * not, NotEnoughDataDecoderException will be raised.
      *
      * @return the list of HttpDatas from Body part for POST getMethod
      * @throws NotEnoughDataDecoderException
      *             Need more chunks
      */
     @Override
     public List<InterfaceHttpData> getBodyHttpDatas() {
         checkDestroyed();
 
         if (!isLastChunk) {
             throw new NotEnoughDataDecoderException();
         }
         return bodyListHttpData;
     }
 
     /**
      * This getMethod returns a List of all HttpDatas with the given name from
      * body.<br>
      *
      * If chunked, all chunks must have been offered using offer() getMethod. If
      * not, NotEnoughDataDecoderException will be raised.
      *
      * @return All Body HttpDatas with the given name (ignore case)
      * @throws NotEnoughDataDecoderException
      *             need more chunks
      */
     @Override
     public List<InterfaceHttpData> getBodyHttpDatas(String name) {
         checkDestroyed();
 
         if (!isLastChunk) {
             throw new NotEnoughDataDecoderException();
         }
         return bodyMapHttpData.get(name);
     }
 
     /**
      * This getMethod returns the first InterfaceHttpData with the given name from
      * body.<br>
      *
      * If chunked, all chunks must have been offered using offer() getMethod. If
      * not, NotEnoughDataDecoderException will be raised.
      *
      * @return The first Body InterfaceHttpData with the given name (ignore
      *         case)
      * @throws NotEnoughDataDecoderException
      *             need more chunks
      */
     @Override
     public InterfaceHttpData getBodyHttpData(String name) {
         checkDestroyed();
 
         if (!isLastChunk) {
             throw new NotEnoughDataDecoderException();
         }
         List<InterfaceHttpData> list = bodyMapHttpData.get(name);
         if (list != null) {
             return list.get(0);
         }
         return null;
     }
 
     /**
      * Initialized the internals from a new chunk
      *
      * @param content
      *            the new received chunk
      * @throws ErrorDataDecoderException
      *             if there is a problem with the charset decoding or other
      *             errors
      */
     @Override
     public HttpPostMultipartRequestDecoder offer(HttpContent content) {
         checkDestroyed();
 
         if (content instanceof LastHttpContent) {
             isLastChunk = true;
         }
 
         ByteBuf buf = content.content();
         if (undecodedChunk == null) {
             undecodedChunk =
                     // Since the Handler will release the incoming later on, we need to copy it
                     //
                     // We are explicit allocate a buffer and NOT calling copy() as otherwise it may set a maxCapacity
                     // which is not really usable for us as we may exceed it once we add more bytes.
                     buf.alloc().buffer(buf.readableBytes()).writeBytes(buf);
         } else {
             undecodedChunk.writeBytes(buf);
         }
         parseBody();
         if (maxBufferedBytes > 0 && undecodedChunk != null && undecodedChunk.readableBytes() > maxBufferedBytes) {
             throw new HttpPostRequestDecoder.TooLongFormFieldException();
         }
         if (undecodedChunk != null && undecodedChunk.writerIndex() > discardThreshold) {
             if (undecodedChunk.refCnt() == 1) {
                 // It's safe to call discardBytes() as we are the only owner of the buffer.
                 undecodedChunk.discardReadBytes();
             } else {
                 // There seems to be multiple references of the buffer. Let's copy the data and release the buffer to
                 // ensure we can give back memory to the system.
                 ByteBuf buffer = undecodedChunk.alloc().buffer(undecodedChunk.readableBytes());
                 buffer.writeBytes(undecodedChunk);
                 undecodedChunk.release();
                 undecodedChunk = buffer;
             }
         }
         return this;
     }
 
     /**
      * True if at current getStatus, there is an available decoded
      * InterfaceHttpData from the Body.
      *
      * This getMethod works for chunked and not chunked request.
      *
      * @return True if at current getStatus, there is a decoded InterfaceHttpData
      * @throws EndOfDataDecoderException
      *             No more data will be available
      */
     @Override
     public boolean hasNext() {
         checkDestroyed();
 
         if (currentStatus == MultiPartStatus.EPILOGUE) {
             // OK except if end of list
             if (bodyListHttpDataRank >= bodyListHttpData.size()) {
                 throw new EndOfDataDecoderException();
             }
         }
         return !bodyListHttpData.isEmpty() && bodyListHttpDataRank < bodyListHttpData.size();
     }
 
     /**
      * Returns the next available InterfaceHttpData or null if, at the time it
      * is called, there is no more available InterfaceHttpData. A subsequent
      * call to offer(httpChunk) could enable more data.
      *
      * Be sure to call {@link InterfaceHttpData#release()} after you are done
      * with processing to make sure to not leak any resources
      *
      * @return the next available InterfaceHttpData or null if none
      * @throws EndOfDataDecoderException
      *             No more data will be available
      */
     @Override
     public InterfaceHttpData next() {
         checkDestroyed();
 
         if (hasNext()) {
             return bodyListHttpData.get(bodyListHttpDataRank++);
         }
         return null;
     }
 
     @Override
     public InterfaceHttpData currentPartialHttpData() {
         if (currentFileUpload != null) {
             return currentFileUpload;
         } else {
             return currentAttribute;
         }
     }
 
     /**
      * This getMethod will parse as much as possible data and fill the list and map
      *
      * @throws ErrorDataDecoderException
      *             if there is a problem with the charset decoding or other
      *             errors
      */
     private void parseBody() {
         if (currentStatus == MultiPartStatus.PREEPILOGUE || currentStatus == MultiPartStatus.EPILOGUE) {
             if (isLastChunk) {
                 currentStatus = MultiPartStatus.EPILOGUE;
             }
             return;
         }
         parseBodyMultipart();
     }
 
     /**
      * Utility function to add a new decoded data
      */
     protected void addHttpData(InterfaceHttpData data) {
         if (data == null) {
             return;
         }
         if (maxFields > 0 && bodyListHttpData.size() >= maxFields) {
             throw new HttpPostRequestDecoder.TooManyFormFieldsException();
         }
         List<InterfaceHttpData> datas = bodyMapHttpData.get(data.getName());
         if (datas == null) {
             datas = new ArrayList<InterfaceHttpData>(1);
             bodyMapHttpData.put(data.getName(), datas);
         }
         datas.add(data);
         bodyListHttpData.add(data);
     }
 
     /**
      * Parse the Body for multipart
      *
      * @throws ErrorDataDecoderException
      *             if there is a problem with the charset decoding or other
      *             errors
      */
     private void parseBodyMultipart() {
         if (undecodedChunk == null || undecodedChunk.readableBytes() == 0) {
             // nothing to decode
             return;
         }
         InterfaceHttpData data = decodeMultipart(currentStatus);
         while (data != null) {
             addHttpData(data);
             if (currentStatus == MultiPartStatus.PREEPILOGUE || currentStatus == MultiPartStatus.EPILOGUE) {
                 break;
             }
             data = decodeMultipart(currentStatus);
         }
     }
 
     /**
      * Decode a multipart request by pieces<br>
      * <br>
      * NOTSTARTED PREAMBLE (<br>
      * (HEADERDELIMITER DISPOSITION (FIELD | FILEUPLOAD))*<br>
      * (HEADERDELIMITER DISPOSITION MIXEDPREAMBLE<br>
      * (MIXEDDELIMITER MIXEDDISPOSITION MIXEDFILEUPLOAD)+<br>
      * MIXEDCLOSEDELIMITER)*<br>
      * CLOSEDELIMITER)+ EPILOGUE<br>
      *
      * Inspired from HttpMessageDecoder
      *
      * @return the next decoded InterfaceHttpData or null if none until now.
      * @throws ErrorDataDecoderException
      *             if an error occurs
      */
     private InterfaceHttpData decodeMultipart(MultiPartStatus state) {
         switch (state) {
         case NOTSTARTED:
             throw new ErrorDataDecoderException("Should not be called with the current getStatus");
         case PREAMBLE:
             // Content-type: multipart/form-data, boundary=AaB03x
             throw new ErrorDataDecoderException("Should not be called with the current getStatus");
         case HEADERDELIMITER: {
             // --AaB03x or --AaB03x--
             return findMultipartDelimiter(multipartDataBoundary, MultiPartStatus.DISPOSITION,
                     MultiPartStatus.PREEPILOGUE);
         }
         case DISPOSITION: {
             // content-disposition: form-data; name="field1"
             // content-disposition: form-data; name="pics"; filename="file1.txt"
             // and other immediate values like
             // Content-type: image/gif
             // Content-Type: text/plain
             // Content-Type: text/plain; charset=ISO-8859-1
             // Content-Transfer-Encoding: binary
             // The following line implies a change of mode (mixed mode)
             // Content-type: multipart/mixed, boundary=BbC04y
             return findMultipartDisposition();
         }
         case FIELD: {
             // Now get value according to Content-Type and Charset
             Charset localCharset = null;
             Attribute charsetAttribute = currentFieldAttributes.get(HttpHeaderValues.CHARSET);
             if (charsetAttribute != null) {
                 try {
                     localCharset = Charset.forName(charsetAttribute.getValue());
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 } catch (UnsupportedCharsetException e) {
                     throw new ErrorDataDecoderException(e);
                 }
             }
             Attribute nameAttribute = currentFieldAttributes.get(HttpHeaderValues.NAME);
             if (currentAttribute == null) {
                 Attribute lengthAttribute = currentFieldAttributes
                         .get(HttpHeaderNames.CONTENT_LENGTH);
                 long size;
                 try {
                     size = lengthAttribute != null? Long.parseLong(lengthAttribute
                             .getValue()) : 0L;
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 } catch (NumberFormatException ignored) {
                     size = 0;
                 }
                 try {
                     if (size > 0) {
                         currentAttribute = factory.createAttribute(request,
                                 cleanString(nameAttribute.getValue()), size);
                     } else {
                         currentAttribute = factory.createAttribute(request,
                                 cleanString(nameAttribute.getValue()));
                     }
                 } catch (NullPointerException e) {
                     throw new ErrorDataDecoderException(e);
                 } catch (IllegalArgumentException e) {
                     throw new ErrorDataDecoderException(e);
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 }
                 if (localCharset != null) {
                     currentAttribute.setCharset(localCharset);
                 }
             }
             // load data
             if (!loadDataMultipartOptimized(undecodedChunk, multipartDataBoundary, currentAttribute)) {
                 // Delimiter is not found. Need more chunks.
                 return null;
             }
             Attribute finalAttribute = currentAttribute;
             currentAttribute = null;
             currentFieldAttributes = null;
             // ready to load the next one
             currentStatus = MultiPartStatus.HEADERDELIMITER;
             return finalAttribute;
         }
         case FILEUPLOAD: {
             // eventually restart from existing FileUpload
             return getFileUpload(multipartDataBoundary);
         }
         case MIXEDDELIMITER: {
             // --AaB03x or --AaB03x--
             // Note that currentFieldAttributes exists
             return findMultipartDelimiter(multipartMixedBoundary, MultiPartStatus.MIXEDDISPOSITION,
                     MultiPartStatus.HEADERDELIMITER);
         }
         case MIXEDDISPOSITION: {
             return findMultipartDisposition();
         }
         case MIXEDFILEUPLOAD: {
             // eventually restart from existing FileUpload
             return getFileUpload(multipartMixedBoundary);
         }
         case PREEPILOGUE:
             return null;
         case EPILOGUE:
             return null;
         default:
             throw new ErrorDataDecoderException("Shouldn't reach here.");
         }
     }
 
     /**
      * Skip control Characters
      *
      * @throws NotEnoughDataDecoderException
      */
     private static void skipControlCharacters(ByteBuf undecodedChunk) {
         if (!undecodedChunk.hasArray()) {
             try {
                 skipControlCharactersStandard(undecodedChunk);
             } catch (IndexOutOfBoundsException e1) {
                 throw new NotEnoughDataDecoderException(e1);
             }
             return;
         }
         SeekAheadOptimize sao = new SeekAheadOptimize(undecodedChunk);
         while (sao.pos < sao.limit) {
             char c = (char) (sao.bytes[sao.pos++] & 0xFF);
             if (!Character.isISOControl(c) && !Character.isWhitespace(c)) {
                 sao.setReadPosition(1);
                 return;
             }
         }
         throw new NotEnoughDataDecoderException("Access out of bounds");
     }
 
     private static void skipControlCharactersStandard(ByteBuf undecodedChunk) {
         for (;;) {
             char c = (char) undecodedChunk.readUnsignedByte();
             if (!Character.isISOControl(c) && !Character.isWhitespace(c)) {
                 undecodedChunk.readerIndex(undecodedChunk.readerIndex() - 1);
                 break;
             }
         }
     }
 
     /**
      * Find the next Multipart Delimiter
      *
      * @param delimiter
      *            delimiter to find
      * @param dispositionStatus
      *            the next getStatus if the delimiter is a start
      * @param closeDelimiterStatus
      *            the next getStatus if the delimiter is a close delimiter
      * @return the next InterfaceHttpData if any
      * @throws ErrorDataDecoderException
      */
     private InterfaceHttpData findMultipartDelimiter(String delimiter, MultiPartStatus dispositionStatus,
             MultiPartStatus closeDelimiterStatus) {
         // --AaB03x or --AaB03x--
         int readerIndex = undecodedChunk.readerIndex();
         try {
             skipControlCharacters(undecodedChunk);
         } catch (NotEnoughDataDecoderException ignored) {
             undecodedChunk.readerIndex(readerIndex);
             return null;
         }
         skipOneLine();
         String newline;
         try {
             newline = readDelimiterOptimized(undecodedChunk, delimiter, charset);
         } catch (NotEnoughDataDecoderException ignored) {
             undecodedChunk.readerIndex(readerIndex);
             return null;
         }
         if (newline.equals(delimiter)) {
             currentStatus = dispositionStatus;
             return decodeMultipart(dispositionStatus);
         }
         if (newline.equals(delimiter + "--")) {
             // CLOSEDELIMITER or MIXED CLOSEDELIMITER found
             currentStatus = closeDelimiterStatus;
             if (currentStatus == MultiPartStatus.HEADERDELIMITER) {
                 // MIXEDCLOSEDELIMITER
                 // end of the Mixed part
                 currentFieldAttributes = null;
                 return decodeMultipart(MultiPartStatus.HEADERDELIMITER);
             }
             return null;
         }
         undecodedChunk.readerIndex(readerIndex);
         throw new ErrorDataDecoderException("No Multipart delimiter found");
     }
 
     /**
      * Find the next Disposition
      *
      * @return the next InterfaceHttpData if any
      * @throws ErrorDataDecoderException
      */
     private InterfaceHttpData findMultipartDisposition() {
         int readerIndex = undecodedChunk.readerIndex();
         if (currentStatus == MultiPartStatus.DISPOSITION) {
             currentFieldAttributes = new TreeMap<CharSequence, Attribute>(CaseIgnoringComparator.INSTANCE);
         }
         // read many lines until empty line with newline found! Store all data
         while (!skipOneLine()) {
             String newline;
             try {
                 skipControlCharacters(undecodedChunk);
                 newline = readLineOptimized(undecodedChunk, charset);
             } catch (NotEnoughDataDecoderException ignored) {
                 undecodedChunk.readerIndex(readerIndex);
                 return null;
             }
             String[] contents = splitMultipartHeader(newline);
             if (HttpHeaderNames.CONTENT_DISPOSITION.contentEqualsIgnoreCase(contents[0])) {
                 boolean checkSecondArg;
                 if (currentStatus == MultiPartStatus.DISPOSITION) {
                     checkSecondArg = HttpHeaderValues.FORM_DATA.contentEqualsIgnoreCase(contents[1]);
                 } else {
                     checkSecondArg = HttpHeaderValues.ATTACHMENT.contentEqualsIgnoreCase(contents[1])
                             || HttpHeaderValues.FILE.contentEqualsIgnoreCase(contents[1]);
                 }
                 if (checkSecondArg) {
                     // read next values and store them in the map as Attribute
                     for (int i = 2; i < contents.length; i++) {
                         String[] values = contents[i].split("=", 2);
                         Attribute attribute;
                         try {
                             attribute = getContentDispositionAttribute(values);
                         } catch (NullPointerException e) {
                             throw new ErrorDataDecoderException(e);
                         } catch (IllegalArgumentException e) {
                             throw new ErrorDataDecoderException(e);
                         }
                         currentFieldAttributes.put(attribute.getName(), attribute);
                     }
                 }
             } else if (HttpHeaderNames.CONTENT_TRANSFER_ENCODING.contentEqualsIgnoreCase(contents[0])) {
                 Attribute attribute;
                 try {
                     attribute = factory.createAttribute(request, HttpHeaderNames.CONTENT_TRANSFER_ENCODING.toString(),
                             cleanString(contents[1]));
                 } catch (NullPointerException e) {
                     throw new ErrorDataDecoderException(e);
                 } catch (IllegalArgumentException e) {
                     throw new ErrorDataDecoderException(e);
                 }
 
                 currentFieldAttributes.put(HttpHeaderNames.CONTENT_TRANSFER_ENCODING, attribute);
             } else if (HttpHeaderNames.CONTENT_LENGTH.contentEqualsIgnoreCase(contents[0])) {
                 Attribute attribute;
                 try {
                     attribute = factory.createAttribute(request, HttpHeaderNames.CONTENT_LENGTH.toString(),
                             cleanString(contents[1]));
                 } catch (NullPointerException e) {
                     throw new ErrorDataDecoderException(e);
                 } catch (IllegalArgumentException e) {
                     throw new ErrorDataDecoderException(e);
                 }
 
                 currentFieldAttributes.put(HttpHeaderNames.CONTENT_LENGTH, attribute);
             } else if (HttpHeaderNames.CONTENT_TYPE.contentEqualsIgnoreCase(contents[0])) {
                 // Take care of possible "multipart/mixed"
                 if (HttpHeaderValues.MULTIPART_MIXED.contentEqualsIgnoreCase(contents[1])) {
                     if (currentStatus == MultiPartStatus.DISPOSITION) {
                         String values = StringUtil.substringAfter(contents[2], '=');
                         multipartMixedBoundary = "--" + values;
                         currentStatus = MultiPartStatus.MIXEDDELIMITER;
                         return decodeMultipart(MultiPartStatus.MIXEDDELIMITER);
                     } else {
                         throw new ErrorDataDecoderException("Mixed Multipart found in a previous Mixed Multipart");
                     }
                 } else {
                     for (int i = 1; i < contents.length; i++) {
                         final String charsetHeader = HttpHeaderValues.CHARSET.toString();
                         if (contents[i].regionMatches(true, 0, charsetHeader, 0, charsetHeader.length())) {
                             String values = StringUtil.substringAfter(contents[i], '=');
                             Attribute attribute;
                             try {
                                 attribute = factory.createAttribute(request, charsetHeader, cleanString(values));
                             } catch (NullPointerException e) {
                                 throw new ErrorDataDecoderException(e);
                             } catch (IllegalArgumentException e) {
                                 throw new ErrorDataDecoderException(e);
                             }
                             currentFieldAttributes.put(HttpHeaderValues.CHARSET, attribute);
                         } else if (contents[i].contains("=")) {
                             String name = StringUtil.substringBefore(contents[i], '=');
                             String values = StringUtil.substringAfter(contents[i], '=');
                             Attribute attribute;
                             try {
                                 attribute = factory.createAttribute(request, cleanString(name), values);
                             } catch (NullPointerException e) {
                                 throw new ErrorDataDecoderException(e);
                             } catch (IllegalArgumentException e) {
                                 throw new ErrorDataDecoderException(e);
                             }
                             currentFieldAttributes.put(name, attribute);
                         } else {
                             Attribute attribute;
                             try {
                                 attribute = factory.createAttribute(request,
                                         cleanString(contents[0]), contents[i]);
                             } catch (NullPointerException e) {
                                 throw new ErrorDataDecoderException(e);
                             } catch (IllegalArgumentException e) {
                                 throw new ErrorDataDecoderException(e);
                             }
                             currentFieldAttributes.put(attribute.getName(), attribute);
                         }
                     }
                 }
             }
         }
         // Is it a FileUpload
         Attribute filenameAttribute = currentFieldAttributes.get(HttpHeaderValues.FILENAME);
         if (currentStatus == MultiPartStatus.DISPOSITION) {
             if (filenameAttribute != null) {
                 // FileUpload
                 currentStatus = MultiPartStatus.FILEUPLOAD;
                 // do not change the buffer position
                 return decodeMultipart(MultiPartStatus.FILEUPLOAD);
             } else {
                 // Field
                 currentStatus = MultiPartStatus.FIELD;
                 // do not change the buffer position
                 return decodeMultipart(MultiPartStatus.FIELD);
             }
         } else {
             if (filenameAttribute != null) {
                 // FileUpload
                 currentStatus = MultiPartStatus.MIXEDFILEUPLOAD;
                 // do not change the buffer position
                 return decodeMultipart(MultiPartStatus.MIXEDFILEUPLOAD);
             } else {
                 // Field is not supported in MIXED mode
                 throw new ErrorDataDecoderException("Filename not found");
             }
         }
     }
 
     private static final String FILENAME_ENCODED = HttpHeaderValues.FILENAME.toString() + '*';
 
     private Attribute getContentDispositionAttribute(String... values) {
         String name = cleanString(values[0]);
         String value = values[1];
 
         // Filename can be token, quoted or encoded. See https://tools.ietf.org/html/rfc5987
         if (HttpHeaderValues.FILENAME.contentEquals(name)) {
             // Value is quoted or token. Strip if quoted:
             int last = value.length() - 1;
             if (last > 0 &&
               value.charAt(0) == HttpConstants.DOUBLE_QUOTE &&
               value.charAt(last) == HttpConstants.DOUBLE_QUOTE) {
                 value = value.substring(1, last);
             }
         } else if (FILENAME_ENCODED.equals(name)) {
             try {
                 name = HttpHeaderValues.FILENAME.toString();
                 String[] split = cleanString(value).split("'", 3);
                 value = QueryStringDecoder.decodeComponent(split[2], Charset.forName(split[0]));
             } catch (ArrayIndexOutOfBoundsException e) {
                  throw new ErrorDataDecoderException(e);
             } catch (UnsupportedCharsetException e) {
                 throw new ErrorDataDecoderException(e);
             }
         } else {
             // otherwise we need to clean the value
             value = cleanString(value);
         }
         return factory.createAttribute(request, name, value);
     }
 
     /**
      * Get the FileUpload (new one or current one)
      *
      * @param delimiter
      *            the delimiter to use
      * @return the InterfaceHttpData if any
      * @throws ErrorDataDecoderException
      */
     protected InterfaceHttpData getFileUpload(String delimiter) {
         // eventually restart from existing FileUpload
         // Now get value according to Content-Type and Charset
         Attribute encoding = currentFieldAttributes.get(HttpHeaderNames.CONTENT_TRANSFER_ENCODING);
         Charset localCharset = charset;
         // Default
         TransferEncodingMechanism mechanism = TransferEncodingMechanism.BIT7;
         if (encoding != null) {
             String code;
             try {
                 code = encoding.getValue().toLowerCase();
             } catch (IOException e) {
                 throw new ErrorDataDecoderException(e);
             }
             if (code.equals(HttpPostBodyUtil.TransferEncodingMechanism.BIT7.value())) {
                 localCharset = CharsetUtil.US_ASCII;
             } else if (code.equals(HttpPostBodyUtil.TransferEncodingMechanism.BIT8.value())) {
                 localCharset = CharsetUtil.ISO_8859_1;
                 mechanism = TransferEncodingMechanism.BIT8;
             } else if (code.equals(HttpPostBodyUtil.TransferEncodingMechanism.BINARY.value())) {
                 // no real charset, so let the default
                 mechanism = TransferEncodingMechanism.BINARY;
             } else {
                 throw new ErrorDataDecoderException("TransferEncoding Unknown: " + code);
             }
         }
         Attribute charsetAttribute = currentFieldAttributes.get(HttpHeaderValues.CHARSET);
         if (charsetAttribute != null) {
             try {
                 localCharset = Charset.forName(charsetAttribute.getValue());
             } catch (IOException e) {
                 throw new ErrorDataDecoderException(e);
             } catch (UnsupportedCharsetException e) {
                 throw new ErrorDataDecoderException(e);
             }
         }
         if (currentFileUpload == null) {
             Attribute filenameAttribute = currentFieldAttributes.get(HttpHeaderValues.FILENAME);
             Attribute nameAttribute = currentFieldAttributes.get(HttpHeaderValues.NAME);
             Attribute contentTypeAttribute = currentFieldAttributes.get(HttpHeaderNames.CONTENT_TYPE);
             Attribute lengthAttribute = currentFieldAttributes.get(HttpHeaderNames.CONTENT_LENGTH);
             long size;
             try {
                 size = lengthAttribute != null ? Long.parseLong(lengthAttribute.getValue()) : 0L;
             } catch (IOException e) {
                 throw new ErrorDataDecoderException(e);
             } catch (NumberFormatException ignored) {
                 size = 0;
             }
             try {
                 String contentType;
                 if (contentTypeAttribute != null) {
                     contentType = contentTypeAttribute.getValue();
                 } else {
                     contentType = HttpPostBodyUtil.DEFAULT_BINARY_CONTENT_TYPE;
                 }
                 currentFileUpload = factory.createFileUpload(request,
                         cleanString(nameAttribute.getValue()), cleanString(filenameAttribute.getValue()),
                         contentType, mechanism.value(), localCharset,
                         size);
             } catch (NullPointerException e) {
                 throw new ErrorDataDecoderException(e);
             } catch (IllegalArgumentException e) {
                 throw new ErrorDataDecoderException(e);
             } catch (IOException e) {
                 throw new ErrorDataDecoderException(e);
             }
         }
         // load data as much as possible
         if (!loadDataMultipartOptimized(undecodedChunk, delimiter, currentFileUpload)) {
             // Delimiter is not found. Need more chunks.
             return null;
         }
         if (currentFileUpload.isCompleted()) {
             // ready to load the next one
             if (currentStatus == MultiPartStatus.FILEUPLOAD) {
                 currentStatus = MultiPartStatus.HEADERDELIMITER;
                 currentFieldAttributes = null;
             } else {
                 currentStatus = MultiPartStatus.MIXEDDELIMITER;
                 cleanMixedAttributes();
             }
             FileUpload fileUpload = currentFileUpload;
             currentFileUpload = null;
             return fileUpload;
         }
         // do not change the buffer position
         // since some can be already saved into FileUpload
         // So do not change the currentStatus
         return null;
     }
 
     /**
      * Destroy the {@link HttpPostMultipartRequestDecoder} and release all it resources. After this method
      * was called it is not possible to operate on it anymore.
      */
     @Override
     public void destroy() {
         // Release all data items, including those not yet pulled, only file based items
         cleanFiles();
         // Clean Memory based data
         for (InterfaceHttpData httpData : bodyListHttpData) {
             // Might have been already released by the user
             if (httpData.refCnt() > 0) {
                 httpData.release();
             }
         }
 
         destroyed = true;
 
         if (undecodedChunk != null && undecodedChunk.refCnt() > 0) {
             undecodedChunk.release();
             undecodedChunk = null;
         }
     }
 
     /**
      * Clean all HttpDatas (on Disk) for the current request.
      */
     @Override
     public void cleanFiles() {
         checkDestroyed();
 
         factory.cleanRequestHttpData(request);
     }
 
     /**
      * Remove the given FileUpload from the list of FileUploads to clean
      */
     @Override
     public void removeHttpDataFromClean(InterfaceHttpData data) {
         checkDestroyed();
 
         factory.removeHttpDataFromClean(request, data);
     }
 
     /**
      * Remove all Attributes that should be cleaned between two FileUpload in
      * Mixed mode
      */
     private void cleanMixedAttributes() {
         currentFieldAttributes.remove(HttpHeaderValues.CHARSET);
         currentFieldAttributes.remove(HttpHeaderNames.CONTENT_LENGTH);
         currentFieldAttributes.remove(HttpHeaderNames.CONTENT_TRANSFER_ENCODING);
         currentFieldAttributes.remove(HttpHeaderNames.CONTENT_TYPE);
         currentFieldAttributes.remove(HttpHeaderValues.FILENAME);
     }
 
     /**
      * Read one line up to the CRLF or LF
      *
      * @return the String from one line
      * @throws NotEnoughDataDecoderException
      *             Need more chunks and reset the {@code readerIndex} to the previous
      *             value
      */
     private static String readLineOptimized(ByteBuf undecodedChunk, Charset charset) {
         int readerIndex = undecodedChunk.readerIndex();
         ByteBuf line = null;
         try {
             if (undecodedChunk.isReadable()) {
                 int posLfOrCrLf = HttpPostBodyUtil.findLineBreak(undecodedChunk, undecodedChunk.readerIndex());
                 if (posLfOrCrLf <= 0) {
                     throw new NotEnoughDataDecoderException();
                 }
                 try {
                     line = undecodedChunk.alloc().heapBuffer(posLfOrCrLf);
                     line.writeBytes(undecodedChunk, posLfOrCrLf);
 
                     byte nextByte = undecodedChunk.readByte();
                     if (nextByte == HttpConstants.CR) {
                         // force read next byte since LF is the following one
                         undecodedChunk.readByte();
                     }
                     return line.toString(charset);
                 } finally {
                     line.release();
                 }
             }
         } catch (IndexOutOfBoundsException e) {
             undecodedChunk.readerIndex(readerIndex);
             throw new NotEnoughDataDecoderException(e);
         }
         undecodedChunk.readerIndex(readerIndex);
         throw new NotEnoughDataDecoderException();
     }
 
     /**
      * Read one line up to --delimiter or --delimiter-- and if existing the CRLF
      * or LF Read one line up to --delimiter or --delimiter-- and if existing
      * the CRLF or LF. Note that CRLF or LF are mandatory for opening delimiter
      * (--delimiter) but not for closing delimiter (--delimiter--) since some
      * clients does not include CRLF in this case.
      *
      * @param delimiter
      *            of the form --string, such that '--' is already included
      * @return the String from one line as the delimiter searched (opening or
      *         closing)
      * @throws NotEnoughDataDecoderException
      *             Need more chunks and reset the {@code readerIndex} to the previous
      *             value
      */
     private static String readDelimiterOptimized(ByteBuf undecodedChunk, String delimiter, Charset charset) {
         final int readerIndex = undecodedChunk.readerIndex();
         final byte[] bdelimiter = delimiter.getBytes(charset);
         final int delimiterLength = bdelimiter.length;
         try {
             int delimiterPos = HttpPostBodyUtil.findDelimiter(undecodedChunk, readerIndex, bdelimiter, false);
             if (delimiterPos < 0) {
                 // delimiter not found so break here !
                 undecodedChunk.readerIndex(readerIndex);
                 throw new NotEnoughDataDecoderException();
             }
             StringBuilder sb = new StringBuilder(delimiter);
             undecodedChunk.readerIndex(readerIndex + delimiterPos + delimiterLength);
             // Now check if either opening delimiter or closing delimiter
             if (undecodedChunk.isReadable()) {
                 byte nextByte = undecodedChunk.readByte();
                 // first check for opening delimiter
                 if (nextByte == HttpConstants.CR) {
                     nextByte = undecodedChunk.readByte();
                     if (nextByte == HttpConstants.LF) {
                         return sb.toString();
                     } else {
                         // error since CR must be followed by LF
                         // delimiter not found so break here !
                         undecodedChunk.readerIndex(readerIndex);
                         throw new NotEnoughDataDecoderException();
                     }
                 } else if (nextByte == HttpConstants.LF) {
                     return sb.toString();
                 } else if (nextByte == '-') {
                     sb.append('-');
                     // second check for closing delimiter
                     nextByte = undecodedChunk.readByte();
                     if (nextByte == '-') {
                         sb.append('-');
                         // now try to find if CRLF or LF there
                         if (undecodedChunk.isReadable()) {
                             nextByte = undecodedChunk.readByte();
                             if (nextByte == HttpConstants.CR) {
                                 nextByte = undecodedChunk.readByte();
                                 if (nextByte == HttpConstants.LF) {
                                     return sb.toString();
                                 } else {
                                     // error CR without LF
                                     // delimiter not found so break here !
                                     undecodedChunk.readerIndex(readerIndex);
                                     throw new NotEnoughDataDecoderException();
                                 }
                             } else if (nextByte == HttpConstants.LF) {
                                 return sb.toString();
                             } else {
                                 // No CRLF but ok however (Adobe Flash uploader)
                                 // minus 1 since we read one char ahead but
                                 // should not
                                 undecodedChunk.readerIndex(undecodedChunk.readerIndex() - 1);
                                 return sb.toString();
                             }
                         }
                         // FIXME what do we do here?
                         // either considering it is fine, either waiting for
                         // more data to come?
                         // lets try considering it is fine...
                         return sb.toString();
                     }
                     // only one '-' => not enough
                     // whatever now => error since incomplete
                 }
             }
         } catch (IndexOutOfBoundsException e) {
             undecodedChunk.readerIndex(readerIndex);
             throw new NotEnoughDataDecoderException(e);
         }
         undecodedChunk.readerIndex(readerIndex);
         throw new NotEnoughDataDecoderException();
     }
 
     /**
      * Rewrite buffer in order to skip lengthToSkip bytes from current readerIndex,
      * such that any readable bytes available after readerIndex + lengthToSkip (so before writerIndex)
      * are moved at readerIndex position,
      * therefore decreasing writerIndex of lengthToSkip at the end of the process.
      *
      * @param buffer the buffer to rewrite from current readerIndex
      * @param lengthToSkip the size to skip from readerIndex
      */
     private static void rewriteCurrentBuffer(ByteBuf buffer, int lengthToSkip) {
         if (lengthToSkip == 0) {
             return;
         }
         final int readerIndex = buffer.readerIndex();
         final int readableBytes = buffer.readableBytes();
         if (readableBytes == lengthToSkip) {
             buffer.readerIndex(readerIndex);
             buffer.writerIndex(readerIndex);
             return;
         }
         buffer.setBytes(readerIndex, buffer, readerIndex + lengthToSkip, readableBytes - lengthToSkip);
         buffer.readerIndex(readerIndex);
         buffer.writerIndex(readerIndex + readableBytes - lengthToSkip);
     }
 
     /**
      * Load the field value or file data from a Multipart request
      *
      * @return {@code true} if the last chunk is loaded (boundary delimiter found), {@code false} if need more chunks
      * @throws ErrorDataDecoderException
      */
     private static boolean loadDataMultipartOptimized(ByteBuf undecodedChunk, String delimiter, HttpData httpData) {
         if (!undecodedChunk.isReadable()) {
             return false;
         }
         final int startReaderIndex = undecodedChunk.readerIndex();
         final byte[] bdelimiter = delimiter.getBytes(httpData.getCharset());
         int posDelimiter = HttpPostBodyUtil.findDelimiter(undecodedChunk, startReaderIndex, bdelimiter, true);
         if (posDelimiter < 0) {
             // Not found but however perhaps because incomplete so search LF or CRLF from the end.
             // Possible last bytes contain partially delimiter
             // (delimiter is possibly partially there, at least 1 missing byte),
             // therefore searching last delimiter.length +1 (+1 for CRLF instead of LF)
             int readableBytes = undecodedChunk.readableBytes();
             int lastPosition = readableBytes - bdelimiter.length - 1;
             if (lastPosition < 0) {
                 // Not enough bytes, but at most delimiter.length bytes available so can still try to find CRLF there
                 lastPosition = 0;
             }
             posDelimiter = HttpPostBodyUtil.findLastLineBreak(undecodedChunk, startReaderIndex + lastPosition);
             // No LineBreak, however CR can be at the end of the buffer, LF not yet there (issue #11668)
             // Check if last CR (if any) shall not be in the content (definedLength vs actual length + buffer - 1)
             if (posDelimiter < 0 &&
                 httpData.definedLength() == httpData.length() + readableBytes - 1 &&
                 undecodedChunk.getByte(readableBytes + startReaderIndex - 1) == HttpConstants.CR) {
                 // Last CR shall precede a future LF
                 lastPosition = 0;
                 posDelimiter = readableBytes - 1;
             }
             if (posDelimiter < 0) {
                 // not found so this chunk can be fully added
                 ByteBuf content = undecodedChunk.copy();
                 try {
                     httpData.addContent(content, false);
                 } catch (IOException e) {
                     throw new ErrorDataDecoderException(e);
                 }
                 undecodedChunk.readerIndex(startReaderIndex);
                 undecodedChunk.writerIndex(startReaderIndex);
                 return false;
             }
             // posDelimiter is not from startReaderIndex but from startReaderIndex + lastPosition
             posDelimiter += lastPosition;
             if (posDelimiter == 0) {
                 // Nothing to add
                 return false;
             }
             // Not fully but still some bytes to provide: httpData is not yet finished since delimiter not found
             ByteBuf content = undecodedChunk.copy(startReaderIndex, posDelimiter);
             try {
                 httpData.addContent(content, false);
             } catch (IOException e) {
                 throw new ErrorDataDecoderException(e);
             }
             rewriteCurrentBuffer(undecodedChunk, posDelimiter);
             return false;
         }
         // Delimiter found at posDelimiter, including LF or CRLF, so httpData has its last chunk
         ByteBuf content = undecodedChunk.copy(startReaderIndex, posDelimiter);
         try {
             httpData.addContent(content, true);
         } catch (IOException e) {
             throw new ErrorDataDecoderException(e);
         }
         rewriteCurrentBuffer(undecodedChunk, posDelimiter);
         return true;
     }
 
     /**
      * Clean the String from any unallowed character
      *
      * @return the cleaned String
      */
     private static String cleanString(String field) {
         int size = field.length();
         StringBuilder sb = new StringBuilder(size);
         for (int i = 0; i < size; i++) {
             char nextChar = field.charAt(i);
             switch (nextChar) {
             case HttpConstants.COLON:
             case HttpConstants.COMMA:
             case HttpConstants.EQUALS:
             case HttpConstants.SEMICOLON:
             case HttpConstants.HT:
                 sb.append(HttpConstants.SP_CHAR);
                 break;
             case HttpConstants.DOUBLE_QUOTE:
                 // nothing added, just removes it
                 break;
             default:
                 sb.append(nextChar);
                 break;
             }
         }
         return sb.toString().trim();
     }
 
     /**
      * Skip one empty line
      *
      * @return True if one empty line was skipped
      */
     private boolean skipOneLine() {
         if (!undecodedChunk.isReadable()) {
             return false;
         }
         byte nextByte = undecodedChunk.readByte();
         if (nextByte == HttpConstants.CR) {
             if (!undecodedChunk.isReadable()) {
                 undecodedChunk.readerIndex(undecodedChunk.readerIndex() - 1);
                 return false;
             }
             nextByte = undecodedChunk.readByte();
             if (nextByte == HttpConstants.LF) {
                 return true;
             }
             undecodedChunk.readerIndex(undecodedChunk.readerIndex() - 2);
             return false;
         }
         if (nextByte == HttpConstants.LF) {
             return true;
         }
         undecodedChunk.readerIndex(undecodedChunk.readerIndex() - 1);
         return false;
     }
 
     /**
      * Split one header in Multipart
      *
      * @return an array of String where rank 0 is the name of the header,
      *         follows by several values that were separated by ';' or ','
      */
     private static String[] splitMultipartHeader(String sb) {
         ArrayList<String> headers = new ArrayList<String>(1);
         int nameStart;
         int nameEnd;
         int colonEnd;
         int valueStart;
         int valueEnd;
         nameStart = HttpPostBodyUtil.findNonWhitespace(sb, 0);
         for (nameEnd = nameStart; nameEnd < sb.length(); nameEnd++) {
             char ch = sb.charAt(nameEnd);
             if (ch == ':' || Character.isWhitespace(ch)) {
                 break;
             }
         }
         for (colonEnd = nameEnd; colonEnd < sb.length(); colonEnd++) {
             if (sb.charAt(colonEnd) == ':') {
                 colonEnd++;
                 break;
             }
         }
         valueStart = HttpPostBodyUtil.findNonWhitespace(sb, colonEnd);
         valueEnd = HttpPostBodyUtil.findEndOfString(sb);
         headers.add(sb.substring(nameStart, nameEnd));
         String svalue = (valueStart >= valueEnd) ? StringUtil.EMPTY_STRING : sb.substring(valueStart, valueEnd);
         String[] values;
         if (svalue.indexOf(';') >= 0) {
             values = splitMultipartHeaderValues(svalue);
         } else {
             values = svalue.split(",");
         }
         for (String value : values) {
             headers.add(value.trim());
         }
         String[] array = new String[headers.size()];
         for (int i = 0; i < headers.size(); i++) {
             array[i] = headers.get(i);
         }
         return array;
     }
 
     /**
      * Split one header value in Multipart
      * @return an array of String where values that were separated by ';' or ','
      */
     private static String[] splitMultipartHeaderValues(String svalue) {
         List<String> values = InternalThreadLocalMap.get().arrayList(1);
         boolean inQuote = false;
         boolean escapeNext = false;
         int start = 0;
         for (int i = 0; i < svalue.length(); i++) {
             char c = svalue.charAt(i);
             if (inQuote) {
                 if (escapeNext) {
                     escapeNext = false;
                 } else {
                     if (c == '\\') {
                         escapeNext = true;
                     } else if (c == '"') {
                         inQuote = false;
                     }
                 }
             } else {
                 if (c == '"') {
                     inQuote = true;
                 } else if (c == ';') {
                     values.add(svalue.substring(start, i));
                     start = i + 1;
                 }
             }
         }
         values.add(svalue.substring(start));
         return values.toArray(EmptyArrays.EMPTY_STRINGS);
     }
 
     /**
      * This method is package private intentionally in order to allow during tests
      * to access to the amount of memory allocated (capacity) within the private
      * ByteBuf undecodedChunk
      *
      * @return the number of bytes the internal buffer can contain
      */
     int getCurrentAllocatedCapacity() {
         return undecodedChunk.capacity();
     }
 }