1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/logging.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/flash/format.h"
#include "net/disk_cache/flash/log_store.h"
#include "net/disk_cache/flash/log_store_entry.h"
namespace disk_cache {
LogStoreEntry::LogStoreEntry(LogStore* store)
: store_(store), id_(-1), init_(false), closed_(false), deleted_(false) {
DCHECK(store);
}
LogStoreEntry::LogStoreEntry(LogStore* store, int32 id)
: store_(store), id_(id), init_(false), closed_(false), deleted_(false) {
DCHECK(store);
}
LogStoreEntry::~LogStoreEntry() {
DCHECK(!init_ || closed_);
}
bool LogStoreEntry::Init() {
DCHECK(!init_);
if (IsNew()) {
init_ = true;
return true;
}
int32 stream_sizes[kFlashLogStoreEntryNumStreams];
COMPILE_ASSERT(sizeof(stream_sizes) == kFlashLogStoreEntryHeaderSize,
invalid_log_store_entry_header_size);
if (!store_->OpenEntry(id_) ||
!store_->ReadData(id_, stream_sizes, kFlashLogStoreEntryHeaderSize, 0)) {
return false;
}
for (int i = 0, offset = kFlashLogStoreEntryHeaderSize;
i < kFlashLogStoreEntryNumStreams; ++i) {
streams_[i].offset = offset;
streams_[i].size = stream_sizes[i];
offset += stream_sizes[i];
}
init_ = true;
return true;
}
bool LogStoreEntry::Close() {
DCHECK(init_ && !closed_);
if (IsNew()) {
closed_ = deleted_ ? true : Save();
} else {
store_->CloseEntry(id_);
if (deleted_)
store_->DeleteEntry(id_, Size());
closed_ = true;
}
return closed_;
}
int32 LogStoreEntry::id() const {
DCHECK(init_);
return id_;
}
int32 LogStoreEntry::GetDataSize(int index) const {
DCHECK(init_);
return InvalidStream(index) ? 0 : streams_[index].size;
}
int LogStoreEntry::ReadData(int index, int offset, net::IOBuffer* buf,
int buf_len) {
DCHECK(init_);
if (InvalidStream(index))
return net::ERR_INVALID_ARGUMENT;
int stream_size = streams_[index].size;
if (offset >= stream_size || offset < 0 || buf_len == 0)
return 0;
if (offset + buf_len > stream_size)
buf_len = stream_size - offset;
if (!IsNew()) {
offset += streams_[index].offset;
if (store_->ReadData(id_, buf->data(), buf_len, offset))
return buf_len;
return net::ERR_FAILED;
}
memcpy(buf->data(), &streams_[index].write_buffer[offset], buf_len);
return buf_len;
}
int LogStoreEntry::WriteData(int index, int offset, net::IOBuffer* buf,
int buf_len) {
DCHECK(init_ && !closed_);
if (InvalidStream(index))
return net::ERR_INVALID_ARGUMENT;
DCHECK(offset >= 0 && buf_len >= 0);
Stream& stream = streams_[index];
size_t new_size = static_cast<size_t>(offset + buf_len);
if (new_size) {
// TODO(agayev): Currently, only append and overwrite is supported. Add
// support for arbitrary writes.
DCHECK(!offset || offset == stream.size);
if (stream.write_buffer.size() < new_size)
stream.write_buffer.resize(new_size);
memcpy(&streams_[index].write_buffer[offset], buf->data(), buf_len);
}
stream.size = new_size;
return buf_len;
}
void LogStoreEntry::Delete() {
DCHECK(init_ && !closed_);
deleted_ = true;
}
bool LogStoreEntry::IsNew() const {
return id_ == -1;
}
bool LogStoreEntry::InvalidStream(int stream_index) const {
return stream_index < 0 || stream_index >= kFlashLogStoreEntryNumStreams;
}
int32 LogStoreEntry::Size() const {
DCHECK(init_);
int32 size = kFlashLogStoreEntryHeaderSize;
for (int i = 0; i < kFlashLogStoreEntryNumStreams; ++i)
size += streams_[i].size;
DCHECK(size > 0 && size <= kFlashSegmentFreeSpace);
return size;
}
bool LogStoreEntry::Save() {
DCHECK(init_ && !closed_ && !deleted_ && IsNew());
int32 stream_sizes[kFlashLogStoreEntryNumStreams];
COMPILE_ASSERT(sizeof(stream_sizes) == kFlashLogStoreEntryHeaderSize,
invalid_log_store_entry_header_size);
for (int i = 0; i < kFlashLogStoreEntryNumStreams; ++i)
stream_sizes[i] = streams_[i].size;
if (!store_->CreateEntry(Size(), &id_))
return false;
if (!store_->WriteData(stream_sizes, kFlashLogStoreEntryHeaderSize))
return false;
for (int i = 0; i < kFlashLogStoreEntryNumStreams; ++i) {
if (streams_[i].size > 0 &&
!store_->WriteData(&streams_[i].write_buffer[0], streams_[i].size)) {
return false;
}
}
store_->CloseEntry(id_);
return true;
}
LogStoreEntry::Stream::Stream() : offset(0), size(0) {
}
LogStoreEntry::Stream::~Stream() {
}
} // namespace disk_cache
|
