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
|
// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/download/data_url_blob_reader.h"
#include "base/containers/span.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_util.h"
namespace content {
// static
void DataURLBlobReader::ReadDataURLFromBlob(
mojo::PendingRemote<blink::mojom::Blob> data_url_blob,
DataURLBlobReader::ReadCompletionCallback read_completion_callback) {
DataURLBlobReader* reader = new DataURLBlobReader(std::move(data_url_blob));
auto data_url_blob_reader = base::WrapUnique(reader);
// Move the reader to be owned by the callback.
base::OnceClosure closure = base::BindOnce(
[](ReadCompletionCallback callback,
std::unique_ptr<DataURLBlobReader> blob_reader) {
GURL url = base::StartsWith(blob_reader->url_data_,
"data:", base::CompareCase::SENSITIVE)
? GURL(blob_reader->url_data_)
: GURL();
std::move(callback).Run(std::move(url));
},
std::move(read_completion_callback), std::move(data_url_blob_reader));
reader->Start(std::move(closure));
}
DataURLBlobReader::DataURLBlobReader(
mojo::PendingRemote<blink::mojom::Blob> data_url_blob)
: data_url_blob_(std::move(data_url_blob)) {
data_url_blob_.set_disconnect_handler(
base::BindOnce(&DataURLBlobReader::OnFailed, base::Unretained(this)));
DETACH_FROM_SEQUENCE(sequence_checker_);
}
DataURLBlobReader::~DataURLBlobReader() = default;
void DataURLBlobReader::Start(base::OnceClosure callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
mojo::ScopedDataPipeProducerHandle producer_handle;
mojo::ScopedDataPipeConsumerHandle consumer_handle;
MojoResult result = CreateDataPipe(nullptr, producer_handle, consumer_handle);
if (result != MOJO_RESULT_OK) {
std::move(callback).Run();
return;
}
callback_ = std::move(callback);
data_url_blob_->ReadAll(std::move(producer_handle), mojo::NullRemote());
data_pipe_drainer_ =
std::make_unique<mojo::DataPipeDrainer>(this, std::move(consumer_handle));
}
void DataURLBlobReader::OnDataAvailable(base::span<const uint8_t> data) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
url_data_.append(base::as_string_view(data));
}
void DataURLBlobReader::OnDataComplete() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
std::move(callback_).Run();
}
void DataURLBlobReader::OnFailed() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
url_data_.clear();
std::move(callback_).Run();
}
} // namespace content
|
