third_party/WebKit/Source/modules/filesystem/FileWriterBase.cpp

   1 /*
   2  * Copyright (C) 2010 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 #include "config.h"
  32
  33 #include "modules/filesystem/FileWriterBase.h"
  34
  35 #include "core/events/ProgressEvent.h"
  36 #include "core/fileapi/Blob.h"
  37 #include "core/fileapi/FileError.h"
  38 #include "public/platform/WebFileWriter.h"
  39
  40 namespace blink {
  41
  42 FileWriterBase::~FileWriterBase()
  43 {
  44 }
  45
  46 void FileWriterBase::initialize(PassOwnPtr<WebFileWriter> writer, long long length)
  47 {
  48     ASSERT(!m_writer);
  49     ASSERT(length >= 0);
  50     m_writer = writer;
  51     m_length = length;
  52 }
  53
  54 FileWriterBase::FileWriterBase()
  55     : m_position(0)
  56 {
  57 }
  58
  59 void FileWriterBase::seekInternal(long long position)
  60 {
  61     if (position > m_length)
  62         position = m_length;
  63     else if (position < 0)
  64         position = m_length + position;
  65     if (position < 0)
  66         position = 0;
  67     m_position = position;
  68 }
  69
  70 } // namespace blink