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 "FileWriter.h"
36
37 #include "AsyncFileWriter.h"
38 #include "Blob.h"
39 #include "ExceptionCode.h"
40 #include "FileError.h"
41 #include "FileException.h"
42 #include "ProgressEvent.h"
43
44 namespace WebCore {
45
FileWriter(ScriptExecutionContext * context)46 FileWriter::FileWriter(ScriptExecutionContext* context)
47 : ActiveDOMObject(context, this)
48 , m_readyState(INIT)
49 , m_startedWriting(false)
50 , m_bytesWritten(0)
51 , m_bytesToWrite(0)
52 , m_truncateLength(-1)
53 {
54 }
55
~FileWriter()56 FileWriter::~FileWriter()
57 {
58 if (m_readyState == WRITING)
59 stop();
60 }
61
hasPendingActivity() const62 bool FileWriter::hasPendingActivity() const
63 {
64 return m_readyState == WRITING || ActiveDOMObject::hasPendingActivity();
65 }
66
canSuspend() const67 bool FileWriter::canSuspend() const
68 {
69 // FIXME: It is not currently possible to suspend a FileWriter, so pages with FileWriter can not go into page cache.
70 return false;
71 }
72
stop()73 void FileWriter::stop()
74 {
75 if (writer() && m_readyState == WRITING)
76 writer()->abort();
77 m_blobBeingWritten.clear();
78 m_readyState = DONE;
79 }
80
write(Blob * data,ExceptionCode & ec)81 void FileWriter::write(Blob* data, ExceptionCode& ec)
82 {
83 ASSERT(writer());
84 if (m_readyState == WRITING) {
85 setError(FileError::INVALID_STATE_ERR, ec);
86 return;
87 }
88 if (!data) {
89 setError(FileError::TYPE_MISMATCH_ERR, ec);
90 return;
91 }
92
93 m_blobBeingWritten = data;
94 m_readyState = WRITING;
95 m_startedWriting = false;
96 m_bytesWritten = 0;
97 m_bytesToWrite = data->size();
98 writer()->write(position(), data);
99 }
100
seek(long long position,ExceptionCode & ec)101 void FileWriter::seek(long long position, ExceptionCode& ec)
102 {
103 ASSERT(writer());
104 if (m_readyState == WRITING) {
105 setError(FileError::INVALID_STATE_ERR, ec);
106 return;
107 }
108
109 m_bytesWritten = 0;
110 m_bytesToWrite = 0;
111 seekInternal(position);
112 }
113
truncate(long long position,ExceptionCode & ec)114 void FileWriter::truncate(long long position, ExceptionCode& ec)
115 {
116 ASSERT(writer());
117 if (m_readyState == WRITING || position < 0) {
118 setError(FileError::INVALID_STATE_ERR, ec);
119 return;
120 }
121 m_readyState = WRITING;
122 m_bytesWritten = 0;
123 m_bytesToWrite = 0;
124 m_truncateLength = position;
125 writer()->truncate(position);
126 }
127
abort(ExceptionCode & ec)128 void FileWriter::abort(ExceptionCode& ec)
129 {
130 ASSERT(writer());
131 if (m_readyState != WRITING) {
132 setError(FileError::INVALID_STATE_ERR, ec);
133 return;
134 }
135
136 m_error = FileError::create(FileError::ABORT_ERR);
137 writer()->abort();
138 }
139
didWrite(long long bytes,bool complete)140 void FileWriter::didWrite(long long bytes, bool complete)
141 {
142 ASSERT(bytes + m_bytesWritten > 0);
143 ASSERT(bytes + m_bytesWritten <= m_bytesToWrite);
144 if (!m_startedWriting) {
145 fireEvent(eventNames().writestartEvent);
146 m_startedWriting = true;
147 }
148 m_bytesWritten += bytes;
149 ASSERT((m_bytesWritten == m_bytesToWrite) || !complete);
150 setPosition(position() + bytes);
151 if (position() > length())
152 setLength(position());
153 fireEvent(eventNames().progressEvent);
154 if (complete) {
155 m_blobBeingWritten.clear();
156 fireEvent(eventNames().writeEvent);
157 m_readyState = DONE;
158 fireEvent(eventNames().writeendEvent);
159 }
160 }
161
didTruncate()162 void FileWriter::didTruncate()
163 {
164 ASSERT(m_truncateLength >= 0);
165 fireEvent(eventNames().writestartEvent);
166 setLength(m_truncateLength);
167 if (position() > length())
168 setPosition(length());
169 m_truncateLength = -1;
170 fireEvent(eventNames().writeEvent);
171 m_readyState = DONE;
172 fireEvent(eventNames().writeendEvent);
173 }
174
didFail(FileError::ErrorCode code)175 void FileWriter::didFail(FileError::ErrorCode code)
176 {
177 m_error = FileError::create(code);
178 fireEvent(eventNames().errorEvent);
179 if (FileError::ABORT_ERR == code)
180 fireEvent(eventNames().abortEvent);
181 fireEvent(eventNames().errorEvent);
182 m_blobBeingWritten.clear();
183 m_readyState = DONE;
184 fireEvent(eventNames().writeendEvent);
185 }
186
fireEvent(const AtomicString & type)187 void FileWriter::fireEvent(const AtomicString& type)
188 {
189 dispatchEvent(ProgressEvent::create(type, true, m_bytesWritten, m_bytesToWrite));
190 }
191
setError(FileError::ErrorCode errorCode,ExceptionCode & ec)192 void FileWriter::setError(FileError::ErrorCode errorCode, ExceptionCode& ec)
193 {
194 ec = FileException::ErrorCodeToExceptionCode(errorCode);
195 m_error = FileError::create(errorCode);
196 }
197
198 } // namespace WebCore
199
200 #endif // ENABLE(FILE_SYSTEM)
201