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Side by Side Diff: base/i18n/streaming_utf8_validator.h

Issue 1542323002: Switch to standard integer types in base/i18n/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: header Created 5 years ago
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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 // A streaming validator for UTF-8. Validation is based on the definition in 5 // A streaming validator for UTF-8. Validation is based on the definition in
6 // RFC-3629. In particular, it does not reject the invalid characters rejected 6 // RFC-3629. In particular, it does not reject the invalid characters rejected
7 // by base::IsStringUTF8(). 7 // by base::IsStringUTF8().
8 // 8 //
9 // The implementation detects errors on the first possible byte. 9 // The implementation detects errors on the first possible byte.
10 10
11 #ifndef BASE_I18N_STREAMING_UTF8_VALIDATOR_H_ 11 #ifndef BASE_I18N_STREAMING_UTF8_VALIDATOR_H_
12 #define BASE_I18N_STREAMING_UTF8_VALIDATOR_H_ 12 #define BASE_I18N_STREAMING_UTF8_VALIDATOR_H_
13 13
14 #include <stddef.h>
15 #include <stdint.h>
16
14 #include <string> 17 #include <string>
15 18
16 #include "base/basictypes.h"
17 #include "base/i18n/base_i18n_export.h" 19 #include "base/i18n/base_i18n_export.h"
20 #include "base/macros.h"
18 21
19 namespace base { 22 namespace base {
20 23
21 class BASE_I18N_EXPORT StreamingUtf8Validator { 24 class BASE_I18N_EXPORT StreamingUtf8Validator {
22 public: 25 public:
23 // The validator exposes 3 states. It starts in state VALID_ENDPOINT. As it 26 // The validator exposes 3 states. It starts in state VALID_ENDPOINT. As it
24 // processes characters it alternates between VALID_ENDPOINT and 27 // processes characters it alternates between VALID_ENDPOINT and
25 // VALID_MIDPOINT. If it encounters an invalid byte or UTF-8 sequence the 28 // VALID_MIDPOINT. If it encounters an invalid byte or UTF-8 sequence the
26 // state changes permanently to INVALID. 29 // state changes permanently to INVALID.
27 enum State { 30 enum State {
(...skipping 16 matching lines...) Expand all
44 void Reset(); 47 void Reset();
45 48
46 // Validate a complete string using the same criteria. Returns true if the 49 // Validate a complete string using the same criteria. Returns true if the
47 // string only contains complete, valid UTF-8 codepoints. 50 // string only contains complete, valid UTF-8 codepoints.
48 static bool Validate(const std::string& string); 51 static bool Validate(const std::string& string);
49 52
50 private: 53 private:
51 // The current state of the validator. Value 0 is the initial/valid state. 54 // The current state of the validator. Value 0 is the initial/valid state.
52 // The state is stored as an offset into |kUtf8ValidatorTables|. The special 55 // The state is stored as an offset into |kUtf8ValidatorTables|. The special
53 // state |kUtf8InvalidState| is invalid. 56 // state |kUtf8InvalidState| is invalid.
54 uint8 state_; 57 uint8_t state_;
55 58
56 // This type could be made copyable but there is currently no use-case for 59 // This type could be made copyable but there is currently no use-case for
57 // it. 60 // it.
58 DISALLOW_COPY_AND_ASSIGN(StreamingUtf8Validator); 61 DISALLOW_COPY_AND_ASSIGN(StreamingUtf8Validator);
59 }; 62 };
60 63
61 } // namespace base 64 } // namespace base
62 65
63 #endif // BASE_I18N_STREAMING_UTF8_VALIDATOR_H_ 66 #endif // BASE_I18N_STREAMING_UTF8_VALIDATOR_H_
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