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(BLOB) || ENABLE(FILE_SYSTEM) 34 35 #include "FileStream.h" 36 37 #include "PlatformString.h" 38 39 namespace WebCore { 40 41 FileStream::FileStream() 42 : m_handle(invalidPlatformFileHandle) 43 , m_bytesProcessed(0) 44 , m_totalBytesToRead(0) 45 { 46 } 47 48 FileStream::~FileStream() 49 { 50 ASSERT(!isHandleValid(m_handle)); 51 } 52 53 // FIXME: To be removed when we switch to using BlobData. 54 void FileStream::start() 55 { 56 } 57 58 void FileStream::stop() 59 { 60 close(); 61 } 62 63 long long FileStream::getSize(const String& path, double expectedModificationTime) 64 { 65 // Check the modification time for the possible file change. 66 time_t modificationTime; 67 if (!getFileModificationTime(path, modificationTime)) 68 return -1; 69 if (expectedModificationTime) { 70 if (static_cast<time_t>(expectedModificationTime) != modificationTime) 71 return -1; 72 } 73 74 // Now get the file size. 75 long long length; 76 if (!getFileSize(path, length)) 77 return -1; 78 79 return length; 80 } 81 82 bool FileStream::openForRead(const String& path, long long offset, long long length) 83 { 84 if (isHandleValid(m_handle)) 85 return true; 86 87 // Open the file. 88 m_handle = openFile(path, OpenForRead); 89 if (!isHandleValid(m_handle)) 90 return false; 91 92 // Jump to the beginning position if the file has been sliced. 93 if (offset > 0) { 94 if (seekFile(m_handle, offset, SeekFromBeginning) < 0) 95 return false; 96 } 97 98 m_totalBytesToRead = length; 99 m_bytesProcessed = 0; 100 101 return true; 102 } 103 104 bool FileStream::openForWrite(const String&) 105 { 106 // FIXME: to be implemented. 107 return false; 108 } 109 110 void FileStream::close() 111 { 112 if (isHandleValid(m_handle)) { 113 closeFile(m_handle); 114 m_handle = invalidPlatformFileHandle; 115 } 116 } 117 118 int FileStream::read(char* buffer, int bufferSize) 119 { 120 if (!isHandleValid(m_handle)) 121 return -1; 122 123 long long remaining = m_totalBytesToRead - m_bytesProcessed; 124 int bytesToRead = (remaining < bufferSize) ? static_cast<int>(remaining) : bufferSize; 125 int bytesRead = 0; 126 if (bytesToRead > 0) 127 bytesRead = readFromFile(m_handle, buffer, bytesToRead); 128 if (bytesRead < 0) 129 return -1; 130 if (bytesRead > 0) 131 m_bytesProcessed += bytesRead; 132 133 return bytesRead; 134 } 135 136 int FileStream::write(const KURL&, long long, int) 137 { 138 // FIXME: to be implemented. 139 return -1; 140 } 141 142 bool FileStream::truncate(long long) 143 { 144 // FIXME: to be implemented. 145 return false; 146 } 147 148 } // namespace WebCore 149 150 #endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 151