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
44namespace WebCore {
45
46FileWriter::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
56FileWriter::~FileWriter()
57{
58    if (m_readyState == WRITING)
59        stop();
60}
61
62bool FileWriter::hasPendingActivity() const
63{
64    return m_readyState == WRITING || ActiveDOMObject::hasPendingActivity();
65}
66
67bool 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
73void FileWriter::stop()
74{
75    if (writer() && m_readyState == WRITING)
76        writer()->abort();
77    m_blobBeingWritten.clear();
78    m_readyState = DONE;
79}
80
81void 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
101void 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
114void 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
128void 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
140void 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
162void 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
175void 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
187void FileWriter::fireEvent(const AtomicString& type)
188{
189    dispatchEvent(ProgressEvent::create(type, true, m_bytesWritten, m_bytesToWrite));
190}
191
192void 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