Remove the flash specific disk cache backend.

net/disk_cache/flash/log_store_entry.cc

-// 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