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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_READAHEAD_FILE_STREAM_READER_H_ | 5 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_READAHEAD_FILE_STREAM_READER_H_ |
6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_READAHEAD_FILE_STREAM_READER_H_ | 6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_READAHEAD_FILE_STREAM_READER_H_ |
7 | 7 |
| 8 #include <stdint.h> |
| 9 |
8 #include <queue> | 10 #include <queue> |
9 | 11 |
| 12 #include "base/macros.h" |
10 #include "base/memory/weak_ptr.h" | 13 #include "base/memory/weak_ptr.h" |
11 #include "net/base/io_buffer.h" | 14 #include "net/base/io_buffer.h" |
12 #include "storage/browser/fileapi/file_stream_reader.h" | 15 #include "storage/browser/fileapi/file_stream_reader.h" |
13 | 16 |
14 // Wraps a source FileStreamReader with a readahead buffer. | 17 // Wraps a source FileStreamReader with a readahead buffer. |
15 class ReadaheadFileStreamReader | 18 class ReadaheadFileStreamReader |
16 : public NON_EXPORTED_BASE(storage::FileStreamReader) { | 19 : public NON_EXPORTED_BASE(storage::FileStreamReader) { |
17 public: | 20 public: |
18 // Takes ownership of |source|. | 21 // Takes ownership of |source|. |
19 explicit ReadaheadFileStreamReader(storage::FileStreamReader* source); | 22 explicit ReadaheadFileStreamReader(storage::FileStreamReader* source); |
20 | 23 |
21 ~ReadaheadFileStreamReader() override; | 24 ~ReadaheadFileStreamReader() override; |
22 | 25 |
23 // FileStreamReader overrides. | 26 // FileStreamReader overrides. |
24 int Read(net::IOBuffer* buf, | 27 int Read(net::IOBuffer* buf, |
25 int buf_len, | 28 int buf_len, |
26 const net::CompletionCallback& callback) override; | 29 const net::CompletionCallback& callback) override; |
27 int64 GetLength(const net::Int64CompletionCallback& callback) override; | 30 int64_t GetLength(const net::Int64CompletionCallback& callback) override; |
28 | 31 |
29 private: | 32 private: |
30 // Returns the number of bytes consumed from the internal cache into |sink|. | 33 // Returns the number of bytes consumed from the internal cache into |sink|. |
31 // Returns an error code if we are out of cache, hit an error, or hit EOF. | 34 // Returns an error code if we are out of cache, hit an error, or hit EOF. |
32 int FinishReadFromCacheOrStoredError(net::DrainableIOBuffer* sink); | 35 int FinishReadFromCacheOrStoredError(net::DrainableIOBuffer* sink); |
33 | 36 |
34 // Reads into a new buffer from the source reader. This calls | 37 // Reads into a new buffer from the source reader. This calls |
35 // OnFinishReadFromSource when it completes (either synchronously or | 38 // OnFinishReadFromSource when it completes (either synchronously or |
36 // asynchronously). | 39 // asynchronously). |
37 void ReadFromSourceIfNeeded(); | 40 void ReadFromSourceIfNeeded(); |
(...skipping 15 matching lines...) Expand all Loading... |
53 // reading and fill the cache. | 56 // reading and fill the cache. |
54 scoped_refptr<net::DrainableIOBuffer> pending_sink_buffer_; | 57 scoped_refptr<net::DrainableIOBuffer> pending_sink_buffer_; |
55 net::CompletionCallback pending_read_callback_; | 58 net::CompletionCallback pending_read_callback_; |
56 | 59 |
57 base::WeakPtrFactory<ReadaheadFileStreamReader> weak_factory_; | 60 base::WeakPtrFactory<ReadaheadFileStreamReader> weak_factory_; |
58 | 61 |
59 DISALLOW_COPY_AND_ASSIGN(ReadaheadFileStreamReader); | 62 DISALLOW_COPY_AND_ASSIGN(ReadaheadFileStreamReader); |
60 }; | 63 }; |
61 | 64 |
62 #endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_READAHEAD_FILE_STREAM_READER_H
_ | 65 #endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_READAHEAD_FILE_STREAM_READER_H
_ |
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