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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 #include "base/strings/string_number_conversions.h" | 5 #include "base/strings/string_number_conversions.h" |
| 6 | 6 |
| 7 #include <ctype.h> | 7 #include <ctype.h> |
| 8 #include <errno.h> | 8 #include <errno.h> |
| 9 #include <stdlib.h> | 9 #include <stdlib.h> |
| 10 #include <wctype.h> | 10 #include <wctype.h> |
| 11 | 11 |
| 12 #include <limits> | 12 #include <limits> |
| 13 | 13 |
| 14 #include "base/logging.h" | 14 #include "base/logging.h" |
| 15 #include "base/numerics/safe_conversions.h" | |
| 16 #include "base/numerics/safe_math.h" | 15 #include "base/numerics/safe_math.h" |
| 17 #include "base/scoped_clear_errno.h" | 16 #include "base/scoped_clear_errno.h" |
| 18 #include "base/strings/utf_string_conversions.h" | |
| 19 #include "base/third_party/dmg_fp/dmg_fp.h" | 17 #include "base/third_party/dmg_fp/dmg_fp.h" |
| 20 | 18 |
| 21 namespace base { | 19 namespace base { |
| 22 | 20 |
| 23 namespace { | 21 namespace { |
| 24 | 22 |
| 25 template <typename STR, typename INT> | 23 template <typename STR, typename INT> |
| 26 struct IntToStringT { | 24 struct IntToStringT { |
| 27 static STR IntToString(INT value) { | 25 static STR IntToString(INT value) { |
| 28 // log10(2) ~= 0.3 bytes needed per bit or per byte log10(2**8) ~= 2.4. | 26 // log10(2) ~= 0.3 bytes needed per bit or per byte log10(2**8) ~= 2.4. |
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| 131 typedef IteratorRangeToNumberTraits traits; | 129 typedef IteratorRangeToNumberTraits traits; |
| 132 typedef typename traits::iterator_type const_iterator; | 130 typedef typename traits::iterator_type const_iterator; |
| 133 typedef typename traits::value_type value_type; | 131 typedef typename traits::value_type value_type; |
| 134 | 132 |
| 135 // Generalized iterator-range-to-number conversion. | 133 // Generalized iterator-range-to-number conversion. |
| 136 // | 134 // |
| 137 static bool Invoke(const_iterator begin, | 135 static bool Invoke(const_iterator begin, |
| 138 const_iterator end, | 136 const_iterator end, |
| 139 value_type* output) { | 137 value_type* output) { |
| 140 bool valid = true; | 138 bool valid = true; |
| 141 | |
|
scottmg
2016/06/14 15:58:48
nit; probably no need to delete these blank lines.
ananta
2016/06/14 19:13:15
Done.
| |
| 142 while (begin != end && LocalIsWhitespace(*begin)) { | 139 while (begin != end && LocalIsWhitespace(*begin)) { |
| 143 valid = false; | 140 valid = false; |
| 144 ++begin; | 141 ++begin; |
| 145 } | 142 } |
| 146 | 143 |
| 147 if (begin != end && *begin == '-') { | 144 if (begin != end && *begin == '-') { |
| 148 if (!std::numeric_limits<value_type>::is_signed) { | 145 if (!std::numeric_limits<value_type>::is_signed) { |
| 149 *output = 0; | 146 *output = 0; |
| 150 valid = false; | 147 valid = false; |
| 151 } else if (!Negative::Invoke(begin + 1, end, output)) { | 148 } else if (!Negative::Invoke(begin + 1, end, output)) { |
| 152 valid = false; | 149 valid = false; |
| 153 } | 150 } |
| 154 } else { | 151 } else { |
| 155 if (begin != end && *begin == '+') { | 152 if (begin != end && *begin == '+') { |
| 156 ++begin; | 153 ++begin; |
| 157 } | 154 } |
| 158 if (!Positive::Invoke(begin, end, output)) { | 155 if (!Positive::Invoke(begin, end, output)) { |
| 159 valid = false; | 156 valid = false; |
| 160 } | 157 } |
| 161 } | 158 } |
| 162 | |
| 163 return valid; | 159 return valid; |
| 164 } | 160 } |
| 165 | 161 |
| 166 private: | 162 private: |
| 167 // Sign provides: | 163 // Sign provides: |
| 168 // - a static function, CheckBounds, that determines whether the next digit | 164 // - a static function, CheckBounds, that determines whether the next digit |
| 169 // causes an overflow/underflow | 165 // causes an overflow/underflow |
| 170 // - a static function, Increment, that appends the next digit appropriately | 166 // - a static function, Increment, that appends the next digit appropriately |
| 171 // according to the sign of the number being parsed. | 167 // according to the sign of the number being parsed. |
| 172 template<typename Sign> | 168 template<typename Sign> |
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| 477 bool HexStringToUInt64(const StringPiece& input, uint64_t* output) { | 473 bool HexStringToUInt64(const StringPiece& input, uint64_t* output) { |
| 478 return IteratorRangeToNumber<HexIteratorRangeToUInt64Traits>::Invoke( | 474 return IteratorRangeToNumber<HexIteratorRangeToUInt64Traits>::Invoke( |
| 479 input.begin(), input.end(), output); | 475 input.begin(), input.end(), output); |
| 480 } | 476 } |
| 481 | 477 |
| 482 bool HexStringToBytes(const std::string& input, std::vector<uint8_t>* output) { | 478 bool HexStringToBytes(const std::string& input, std::vector<uint8_t>* output) { |
| 483 return HexStringToBytesT(input, output); | 479 return HexStringToBytesT(input, output); |
| 484 } | 480 } |
| 485 | 481 |
| 486 } // namespace base | 482 } // namespace base |
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