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)
34
35#include "FileStream.h"
36
37#include "FileSystem.h"
38#include <wtf/text/WTFString.h>
39
40namespace WebCore {
41
42FileStream::FileStream()
43    : m_handle(invalidPlatformFileHandle)
44    , m_bytesProcessed(0)
45    , m_totalBytesToRead(0)
46{
47}
48
49FileStream::~FileStream()
50{
51    ASSERT(!isHandleValid(m_handle));
52}
53
54// FIXME: To be removed when we switch to using BlobData.
55void FileStream::start()
56{
57}
58
59void FileStream::stop()
60{
61    close();
62}
63
64long long FileStream::getSize(const String& path, double expectedModificationTime)
65{
66    // Check the modification time for the possible file change.
67    time_t modificationTime;
68    if (!getFileModificationTime(path, modificationTime))
69        return -1;
70    if (isValidFileTime(expectedModificationTime)) {
71        if (static_cast<time_t>(expectedModificationTime) != modificationTime)
72            return -1;
73    }
74
75    // Now get the file size.
76    long long length;
77    if (!getFileSize(path, length))
78        return -1;
79
80    return length;
81}
82
83bool FileStream::openForRead(const String& path, long long offset, long long length)
84{
85    if (isHandleValid(m_handle))
86        return true;
87
88    // Open the file.
89    m_handle = openFile(path, OpenForRead);
90    if (!isHandleValid(m_handle))
91        return false;
92
93    // Jump to the beginning position if the file has been sliced.
94    if (offset > 0) {
95        if (seekFile(m_handle, offset, SeekFromBeginning) < 0)
96            return false;
97    }
98
99    m_totalBytesToRead = length;
100    m_bytesProcessed = 0;
101
102    return true;
103}
104
105bool FileStream::openForWrite(const String&)
106{
107    // FIXME: to be implemented.
108    return false;
109}
110
111void FileStream::close()
112{
113    if (isHandleValid(m_handle)) {
114        closeFile(m_handle);
115        m_handle = invalidPlatformFileHandle;
116    }
117}
118
119int FileStream::read(char* buffer, int bufferSize)
120{
121    if (!isHandleValid(m_handle))
122        return -1;
123
124    long long remaining = m_totalBytesToRead - m_bytesProcessed;
125    int bytesToRead = (remaining < bufferSize) ? static_cast<int>(remaining) : bufferSize;
126    int bytesRead = 0;
127    if (bytesToRead > 0)
128        bytesRead = readFromFile(m_handle, buffer, bytesToRead);
129    if (bytesRead < 0)
130        return -1;
131    if (bytesRead > 0)
132        m_bytesProcessed += bytesRead;
133
134    return bytesRead;
135}
136
137int FileStream::write(const KURL&, long long, int)
138{
139    // FIXME: to be implemented.
140    return -1;
141}
142
143bool FileStream::truncate(long long)
144{
145    // FIXME: to be implemented.
146    return false;
147}
148
149} // namespace WebCore
150
151#endif // ENABLE(BLOB)
152