third_party/WebKit/Source/platform/SharedBufferChunkReader.h

   1 /*
   2  * Copyright (C) 2011 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef SharedBufferChunkReader_h
  32 #define SharedBufferChunkReader_h
  33
  34 #include "platform/PlatformExport.h"
  35 #include "wtf/Vector.h"
  36 #include "wtf/text/WTFString.h"
  37
  38 namespace blink {
  39
  40 class SharedBuffer;
  41
  42 class PLATFORM_EXPORT SharedBufferChunkReader {
  43 public:
  44     SharedBufferChunkReader(SharedBuffer*, const Vector<char>& separator);
  45     SharedBufferChunkReader(SharedBuffer*, const char* separator);
  46
  47     void setSeparator(const Vector<char>&);
  48     void setSeparator(const char*);
  49
  50     // Returns false when the end of the buffer was reached.
  51     bool nextChunk(Vector<char>& data, bool includeSeparator = false);
  52
  53     // Returns a null string when the end of the buffer has been reached.
  54     String nextChunkAsUTF8StringWithLatin1Fallback(bool includeSeparator = false);
  55
  56     // Reads size bytes at the current location in the buffer, without changing the buffer position.
  57     // Returns the number of bytes read. That number might be less than the specified size if the end of the buffer was reached.
  58     size_t peek(Vector<char>&, size_t);
  59
  60 private:
  61     SharedBuffer* m_buffer;
  62     size_t m_bufferPosition;
  63     const char* m_segment;
  64     size_t m_segmentLength;
  65     size_t m_segmentIndex;
  66     bool m_reachedEndOfFile;
  67     Vector<char> m_separator;
  68     size_t m_separatorIndex;
  69 };
  70
  71 }
  72
  73 #endif