app_list: Fix possible out of bounds index.
[chromium-blink-merge.git] / extensions / browser / content_hash_reader.h
blobb68378c487c602e6d239aae3824fb4fe5af1170d
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 #ifndef EXTENSIONS_BROWSER_CONTENT_HASH_READER_H_
6 #define EXTENSIONS_BROWSER_CONTENT_HASH_READER_H_
8 #include <string>
9 #include <vector>
11 #include "base/files/file_path.h"
12 #include "base/memory/ref_counted.h"
13 #include "base/memory/scoped_ptr.h"
14 #include "base/version.h"
15 #include "extensions/browser/content_verifier_delegate.h"
17 namespace extensions {
19 class VerifiedContents;
21 // This class creates an object that will read expected hashes that may have
22 // been fetched/calculated by the ContentHashFetcher, and vends them out for
23 // use in ContentVerifyJob's.
24 class ContentHashReader : public base::RefCountedThreadSafe<ContentHashReader> {
25 public:
26 // Create one of these to get expected hashes for the file at |relative_path|
27 // within an extension.
28 ContentHashReader(const std::string& extension_id,
29 const base::Version& extension_version,
30 const base::FilePath& extension_root,
31 const base::FilePath& relative_path,
32 const ContentVerifierKey& key);
34 const std::string& extension_id() const { return extension_id_; }
35 const base::FilePath& relative_path() const { return relative_path_; }
37 // This should be called to initialize this object (reads the expected hashes
38 // from storage, etc.). Must be called on a thread that is allowed to do file
39 // I/O. Returns a boolean indicating success/failure. On failure, this object
40 // should likely be discarded.
41 bool Init();
43 // Return the number of blocks and block size, respectively. Only valid after
44 // calling Init().
45 int block_count() const;
46 int block_size() const;
48 // Returns a pointer to the expected sha256 hash value for the block at the
49 // given index. Only valid after calling Init().
50 bool GetHashForBlock(int block_index, const std::string** result) const;
52 private:
53 friend class base::RefCountedThreadSafe<ContentHashReader>;
54 virtual ~ContentHashReader();
56 enum InitStatus { NOT_INITIALIZED, SUCCESS, FAILURE };
58 std::string extension_id_;
59 base::Version extension_version_;
60 base::FilePath extension_root_;
61 base::FilePath relative_path_;
62 ContentVerifierKey key_;
64 InitStatus status_;
66 // The blocksize used for generating the hashes.
67 int block_size_;
69 scoped_ptr<VerifiedContents> verified_contents_;
71 std::vector<std::string> hashes_;
73 DISALLOW_COPY_AND_ASSIGN(ContentHashReader);
76 } // namespace extensions
78 #endif // EXTENSIONS_BROWSER_CONTENT_HASH_READER_H_