1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/logging.h"
6 #include "net/base/io_buffer.h"
7 #include "net/base/net_errors.h"
8 #include "net/disk_cache/flash/format.h"
9 #include "net/disk_cache/flash/log_store.h"
10 #include "net/disk_cache/flash/log_store_entry.h"
12 namespace disk_cache {
14 LogStoreEntry::LogStoreEntry(LogStore* store)
15 : store_(store), id_(-1), init_(false), closed_(false), deleted_(false) {
19 LogStoreEntry::LogStoreEntry(LogStore* store, int32 id)
20 : store_(store), id_(id), init_(false), closed_(false), deleted_(false) {
24 LogStoreEntry::~LogStoreEntry() {
25 DCHECK(!init_ || closed_);
28 bool LogStoreEntry::Init() {
35 int32 stream_sizes[kFlashLogStoreEntryNumStreams];
36 COMPILE_ASSERT(sizeof(stream_sizes) == kFlashLogStoreEntryHeaderSize,
37 invalid_log_store_entry_header_size);
39 if (!store_->OpenEntry(id_) ||
40 !store_->ReadData(id_, stream_sizes, kFlashLogStoreEntryHeaderSize, 0)) {
43 for (int i = 0, offset = kFlashLogStoreEntryHeaderSize;
44 i < kFlashLogStoreEntryNumStreams; ++i) {
45 streams_[i].offset = offset;
46 streams_[i].size = stream_sizes[i];
47 offset += stream_sizes[i];
53 bool LogStoreEntry::Close() {
54 DCHECK(init_ && !closed_);
57 closed_ = deleted_ ? true : Save();
59 store_->CloseEntry(id_);
61 store_->DeleteEntry(id_, Size());
67 int32 LogStoreEntry::id() const {
72 int32 LogStoreEntry::GetDataSize(int index) const {
74 return InvalidStream(index) ? 0 : streams_[index].size;
77 int LogStoreEntry::ReadData(int index, int offset, net::IOBuffer* buf,
80 if (InvalidStream(index))
81 return net::ERR_INVALID_ARGUMENT;
83 int stream_size = streams_[index].size;
84 if (offset >= stream_size || offset < 0 || buf_len == 0)
86 if (offset + buf_len > stream_size)
87 buf_len = stream_size - offset;
90 offset += streams_[index].offset;
91 if (store_->ReadData(id_, buf->data(), buf_len, offset))
93 return net::ERR_FAILED;
95 memcpy(buf->data(), &streams_[index].write_buffer[offset], buf_len);
99 int LogStoreEntry::WriteData(int index, int offset, net::IOBuffer* buf,
101 DCHECK(init_ && !closed_);
102 if (InvalidStream(index))
103 return net::ERR_INVALID_ARGUMENT;
105 DCHECK(offset >= 0 && buf_len >= 0);
106 Stream& stream = streams_[index];
107 size_t new_size = static_cast<size_t>(offset + buf_len);
109 // TODO(agayev): Currently, only append and overwrite is supported. Add
110 // support for arbitrary writes.
111 DCHECK(!offset || offset == stream.size);
112 if (stream.write_buffer.size() < new_size)
113 stream.write_buffer.resize(new_size);
114 memcpy(&streams_[index].write_buffer[offset], buf->data(), buf_len);
116 stream.size = new_size;
120 void LogStoreEntry::Delete() {
121 DCHECK(init_ && !closed_);
125 bool LogStoreEntry::IsNew() const {
129 bool LogStoreEntry::InvalidStream(int stream_index) const {
130 return stream_index < 0 || stream_index >= kFlashLogStoreEntryNumStreams;
133 int32 LogStoreEntry::Size() const {
135 int32 size = kFlashLogStoreEntryHeaderSize;
136 for (int i = 0; i < kFlashLogStoreEntryNumStreams; ++i)
137 size += streams_[i].size;
138 DCHECK(size > 0 && size <= kFlashSegmentFreeSpace);
142 bool LogStoreEntry::Save() {
143 DCHECK(init_ && !closed_ && !deleted_ && IsNew());
144 int32 stream_sizes[kFlashLogStoreEntryNumStreams];
145 COMPILE_ASSERT(sizeof(stream_sizes) == kFlashLogStoreEntryHeaderSize,
146 invalid_log_store_entry_header_size);
148 for (int i = 0; i < kFlashLogStoreEntryNumStreams; ++i)
149 stream_sizes[i] = streams_[i].size;
151 if (!store_->CreateEntry(Size(), &id_))
153 if (!store_->WriteData(stream_sizes, kFlashLogStoreEntryHeaderSize))
155 for (int i = 0; i < kFlashLogStoreEntryNumStreams; ++i) {
156 if (streams_[i].size > 0 &&
157 !store_->WriteData(&streams_[i].write_buffer[0], streams_[i].size)) {
161 store_->CloseEntry(id_);
165 LogStoreEntry::Stream::Stream() : offset(0), size(0) {
168 LogStoreEntry::Stream::~Stream() {
171 } // namespace disk_cache