1 // Copyright 2014 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 "content/browser/fileapi/upload_file_system_file_element_reader.h"
10 #include "net/base/net_errors.h"
11 #include "webkit/browser/blob/file_stream_reader.h"
12 #include "webkit/browser/fileapi/file_system_context.h"
13 #include "webkit/browser/fileapi/file_system_url.h"
17 UploadFileSystemFileElementReader::UploadFileSystemFileElementReader(
18 fileapi::FileSystemContext* file_system_context,
22 const base::Time& expected_modification_time)
23 : file_system_context_(file_system_context),
25 range_offset_(range_offset),
26 range_length_(range_length),
27 expected_modification_time_(expected_modification_time),
30 weak_ptr_factory_(this) {
33 UploadFileSystemFileElementReader::~UploadFileSystemFileElementReader() {
36 int UploadFileSystemFileElementReader::Init(
37 const net::CompletionCallback& callback) {
39 weak_ptr_factory_.InvalidateWeakPtrs();
43 // Initialize the stream reader and the length.
45 file_system_context_->CreateFileStreamReader(
46 file_system_context_->CrackURL(url_),
48 expected_modification_time_);
49 DCHECK(stream_reader_);
51 const int64 result = stream_reader_->GetLength(
52 base::Bind(&UploadFileSystemFileElementReader::OnGetLength,
53 weak_ptr_factory_.GetWeakPtr(),
56 stream_length_ = result;
60 // The error code can be casted to int.
61 return static_cast<int>(result);
64 uint64 UploadFileSystemFileElementReader::GetContentLength() const {
65 return std::min(stream_length_, range_length_);
68 uint64 UploadFileSystemFileElementReader::BytesRemaining() const {
69 return GetContentLength() - position_;
72 int UploadFileSystemFileElementReader::Read(
75 const net::CompletionCallback& callback) {
76 DCHECK_LT(0, buf_length);
77 DCHECK(stream_reader_);
79 const uint64 num_bytes_to_read =
80 std::min(BytesRemaining(), static_cast<uint64>(buf_length));
82 if (num_bytes_to_read == 0)
85 const int result = stream_reader_->Read(
86 buf, num_bytes_to_read,
87 base::Bind(&UploadFileSystemFileElementReader::OnRead,
88 weak_ptr_factory_.GetWeakPtr(),
91 OnRead(net::CompletionCallback(), result);
95 void UploadFileSystemFileElementReader::OnGetLength(
96 const net::CompletionCallback& callback,
99 stream_length_ = result;
100 callback.Run(net::OK);
103 callback.Run(result);
106 void UploadFileSystemFileElementReader::OnRead(
107 const net::CompletionCallback& callback,
111 DCHECK_LE(position_, GetContentLength());
113 if (!callback.is_null())
114 callback.Run(result);
117 } // namespace content