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      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 #if ENABLE(FILE_SYSTEM)
     34 
     35 #include "FileWriterSync.h"
     36 
     37 #include "AsyncFileWriter.h"
     38 #include "Blob.h"
     39 #include "FileException.h"
     40 
     41 namespace WebCore {
     42 
     43 void FileWriterSync::write(Blob* data, ExceptionCode& ec)
     44 {
     45     ASSERT(writer());
     46     ASSERT(m_complete);
     47     ec = 0;
     48     if (!data) {
     49         ec = FileException::TYPE_MISMATCH_ERR;
     50         return;
     51     }
     52 
     53     prepareForWrite();
     54     writer()->write(position(), data);
     55     writer()->waitForOperationToComplete();
     56     ASSERT(m_complete);
     57     ec = FileException::ErrorCodeToExceptionCode(m_error);
     58     if (ec)
     59         return;
     60     setPosition(position() + data->size());
     61     if (position() > length())
     62         setLength(position());
     63 }
     64 
     65 void FileWriterSync::seek(long long position, ExceptionCode& ec)
     66 {
     67     ASSERT(writer());
     68     ASSERT(m_complete);
     69     ec = 0;
     70     seekInternal(position);
     71 }
     72 
     73 void FileWriterSync::truncate(long long offset, ExceptionCode& ec)
     74 {
     75     ASSERT(writer());
     76     ASSERT(m_complete);
     77     ec = 0;
     78     if (offset < 0) {
     79         ec = FileException::INVALID_STATE_ERR;
     80         return;
     81     }
     82     prepareForWrite();
     83     writer()->truncate(offset);
     84     writer()->waitForOperationToComplete();
     85     ASSERT(m_complete);
     86     ec = FileException::ErrorCodeToExceptionCode(m_error);
     87     if (ec)
     88         return;
     89     if (offset < position())
     90         setPosition(offset);
     91     setLength(offset);
     92 }
     93 
     94 void FileWriterSync::didWrite(long long bytes, bool complete)
     95 {
     96     ASSERT(m_error == FileError::OK);
     97     ASSERT(!m_complete);
     98 #ifndef NDEBUG
     99     m_complete = complete;
    100 #else
    101     ASSERT_UNUSED(complete, complete);
    102 #endif
    103 }
    104 
    105 void FileWriterSync::didTruncate()
    106 {
    107     ASSERT(m_error == FileError::OK);
    108     ASSERT(!m_complete);
    109 #ifndef NDEBUG
    110     m_complete = true;
    111 #endif
    112 }
    113 
    114 void FileWriterSync::didFail(FileError::ErrorCode error)
    115 {
    116     ASSERT(m_error == FileError::OK);
    117     m_error = error;
    118     ASSERT(!m_complete);
    119 #ifndef NDEBUG
    120     m_complete = true;
    121 #endif
    122 }
    123 
    124 FileWriterSync::FileWriterSync()
    125     : m_error(FileError::OK)
    126 #ifndef NDEBUG
    127     , m_complete(true)
    128 #endif
    129 {
    130 }
    131 
    132 void FileWriterSync::prepareForWrite()
    133 {
    134     ASSERT(m_complete);
    135     m_error = FileError::OK;
    136 #ifndef NDEBUG
    137     m_complete = false;
    138 #endif
    139 }
    140 
    141 FileWriterSync::~FileWriterSync()
    142 {
    143 }
    144 
    145 
    146 } // namespace WebCore
    147 
    148 #endif // ENABLE(FILE_SYSTEM)
    149