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1 // Copyright 2015 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. | |
4 | |
5 #ifndef NET_BASE_UPLOAD_DISK_CACHE_ENTRY_ELEMENT_READER_H_ | |
6 #define NET_BASE_UPLOAD_DISK_CACHE_ENTRY_ELEMENT_READER_H_ | |
7 | |
8 #include "base/basictypes.h" | |
9 #include "base/compiler_specific.h" | |
10 #include "base/memory/weak_ptr.h" | |
11 #include "net/base/completion_callback.h" | |
12 #include "net/base/net_export.h" | |
13 #include "net/base/upload_element_reader.h" | |
14 | |
15 namespace disk_cache { | |
16 class Entry; | |
17 } | |
18 | |
19 namespace net { | |
20 | |
21 // An UploadElementReader implementation for disk_cache::Entry objects. The | |
22 // caller keeps ownership of |disk_cache_entry|, and is responsible for ensuring | |
23 // it outlives the UploadDiskCacheEntryElementReader. | |
24 class NET_EXPORT UploadDiskCacheEntryElementReader | |
25 : public UploadElementReader { | |
26 public: | |
27 // Construct a new UploadDiskCacheEntryElementReader which reads from the disk | |
28 // cache entry |disk_cache_entry| with stream index |disk_cache_stream_index|. | |
29 // The new upload reader object will read |range_length| bytes, starting from | |
30 // |range_offset|. To read an whole cache entry give a 0 as |range_offset| and | |
31 // provide the length of the entry's stream as |range_length|. | |
32 UploadDiskCacheEntryElementReader(disk_cache::Entry* disk_cache_entry, | |
33 int disk_cache_stream_index, | |
34 int range_offset, | |
35 int range_length); | |
36 ~UploadDiskCacheEntryElementReader() override; | |
37 | |
38 int range_offset_for_tests() const { return range_begin_offset_; } | |
39 int range_length_for_tests() const { | |
40 return range_end_offset_ - range_begin_offset_; | |
41 } | |
42 | |
43 // UploadElementReader overrides: | |
44 const UploadDiskCacheEntryElementReader* AsDiskCacheEntryReaderForTests() | |
45 const override; | |
46 int Init(const CompletionCallback& callback) override; | |
47 uint64_t GetContentLength() const override; | |
48 uint64_t BytesRemaining() const override; | |
49 bool IsInMemory() const override; | |
50 int Read(IOBuffer* buf, | |
51 int buf_length, | |
52 const CompletionCallback& callback) override; | |
53 | |
54 private: | |
55 void OnReadCompleted(const CompletionCallback& callback, int result); | |
56 | |
57 disk_cache::Entry* const disk_cache_entry_; | |
58 const int disk_cache_stream_index_; | |
59 | |
60 const int range_begin_offset_; | |
61 const int range_end_offset_; | |
62 | |
63 int current_read_offset_; | |
64 | |
65 base::WeakPtrFactory<UploadDiskCacheEntryElementReader> weak_factory_; | |
66 | |
67 DISALLOW_COPY_AND_ASSIGN(UploadDiskCacheEntryElementReader); | |
68 }; | |
69 | |
70 } // namespace net | |
71 | |
72 #endif // NET_BASE_UPLOAD_DISK_CACHE_ENTRY_ELEMENT_READER_H_ | |
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