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 "webkit/browser/blob/local_file_stream_reader.h"
7 #include "base/file_util.h"
8 #include "base/files/file_util_proxy.h"
9 #include "base/location.h"
10 #include "base/logging.h"
11 #include "base/platform_file.h"
12 #include "base/task_runner.h"
13 #include "net/base/file_stream.h"
14 #include "net/base/io_buffer.h"
15 #include "net/base/net_errors.h"
17 namespace webkit_blob {
21 const int kOpenFlagsForRead = base::PLATFORM_FILE_OPEN |
22 base::PLATFORM_FILE_READ |
23 base::PLATFORM_FILE_ASYNC;
27 FileStreamReader* FileStreamReader::CreateForLocalFile(
28 base::TaskRunner* task_runner,
29 const base::FilePath& file_path,
31 const base::Time& expected_modification_time) {
32 return new LocalFileStreamReader(task_runner, file_path, initial_offset,
33 expected_modification_time);
36 LocalFileStreamReader::~LocalFileStreamReader() {
39 int LocalFileStreamReader::Read(net::IOBuffer* buf, int buf_len,
40 const net::CompletionCallback& callback) {
41 DCHECK(!has_pending_open_);
43 return stream_impl_->Read(buf, buf_len, callback);
44 return Open(base::Bind(&LocalFileStreamReader::DidOpenForRead,
45 weak_factory_.GetWeakPtr(),
46 make_scoped_refptr(buf), buf_len, callback));
49 int64 LocalFileStreamReader::GetLength(
50 const net::Int64CompletionCallback& callback) {
51 const bool posted = base::FileUtilProxy::GetFileInfo(
54 base::Bind(&LocalFileStreamReader::DidGetFileInfoForGetLength,
55 weak_factory_.GetWeakPtr(),
58 return net::ERR_IO_PENDING;
61 LocalFileStreamReader::LocalFileStreamReader(
62 base::TaskRunner* task_runner,
63 const base::FilePath& file_path,
65 const base::Time& expected_modification_time)
66 : task_runner_(task_runner),
67 file_path_(file_path),
68 initial_offset_(initial_offset),
69 expected_modification_time_(expected_modification_time),
70 has_pending_open_(false),
71 weak_factory_(this) {}
73 int LocalFileStreamReader::Open(const net::CompletionCallback& callback) {
74 DCHECK(!has_pending_open_);
75 DCHECK(!stream_impl_.get());
76 has_pending_open_ = true;
78 // Call GetLength first to make it perform last-modified-time verification,
79 // and then call DidVerifyForOpen for do the rest.
80 return GetLength(base::Bind(&LocalFileStreamReader::DidVerifyForOpen,
81 weak_factory_.GetWeakPtr(), callback));
84 void LocalFileStreamReader::DidVerifyForOpen(
85 const net::CompletionCallback& callback,
86 int64 get_length_result) {
87 if (get_length_result < 0) {
88 callback.Run(static_cast<int>(get_length_result));
92 stream_impl_.reset(new net::FileStream(task_runner_));
93 const int result = stream_impl_->Open(
94 file_path_, kOpenFlagsForRead,
95 base::Bind(&LocalFileStreamReader::DidOpenFileStream,
96 weak_factory_.GetWeakPtr(),
98 if (result != net::ERR_IO_PENDING)
102 void LocalFileStreamReader::DidOpenFileStream(
103 const net::CompletionCallback& callback,
105 if (result != net::OK) {
106 callback.Run(result);
109 result = stream_impl_->Seek(
110 net::FROM_BEGIN, initial_offset_,
111 base::Bind(&LocalFileStreamReader::DidSeekFileStream,
112 weak_factory_.GetWeakPtr(),
114 if (result != net::ERR_IO_PENDING) {
115 callback.Run(result);
119 void LocalFileStreamReader::DidSeekFileStream(
120 const net::CompletionCallback& callback,
122 if (seek_result < 0) {
123 callback.Run(static_cast<int>(seek_result));
126 if (seek_result != initial_offset_) {
127 callback.Run(net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
130 callback.Run(net::OK);
133 void LocalFileStreamReader::DidOpenForRead(
136 const net::CompletionCallback& callback,
138 DCHECK(has_pending_open_);
139 has_pending_open_ = false;
140 if (open_result != net::OK) {
141 stream_impl_.reset();
142 callback.Run(open_result);
145 DCHECK(stream_impl_.get());
146 const int read_result = stream_impl_->Read(buf, buf_len, callback);
147 if (read_result != net::ERR_IO_PENDING)
148 callback.Run(read_result);
151 void LocalFileStreamReader::DidGetFileInfoForGetLength(
152 const net::Int64CompletionCallback& callback,
153 base::File::Error error,
154 const base::File::Info& file_info) {
155 if (file_info.is_directory) {
156 callback.Run(net::ERR_FILE_NOT_FOUND);
159 if (error != base::File::FILE_OK) {
160 callback.Run(net::FileErrorToNetError(error));
163 if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
164 callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
167 callback.Run(file_info.size);
170 } // namespace webkit_blob