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kalman@chromium.orgd2d0b6b2012-01-26 00:27:291// Copyright (c) 2012 The Chromium Authors. All rights reserved.
brettw@chromium.org528c56d2010-07-30 19:28:442// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
brettw@chromium.orgdfa049e2013-02-07 02:57:225#include "base/strings/string_number_conversions.h"
brettw@chromium.org528c56d2010-07-30 19:28:446
michaelbai@google.com3132e35c2011-07-07 20:46:507#include <ctype.h>
brettw@chromium.org528c56d2010-07-30 19:28:448#include <errno.h>
9#include <stdlib.h>
tzik@chromium.orge7972d12011-06-18 11:53:1410#include <wctype.h>
brettw@chromium.org528c56d2010-07-30 19:28:4411
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3812#include <limits>
jschuh2f220382016-12-02 18:08:4513#include <type_traits>
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3814
brettw@chromium.org528c56d2010-07-30 19:28:4415#include "base/logging.h"
Robert Sesek75b27372019-08-29 14:03:1816#include "base/no_destructor.h"
jschuh7aa19b92015-09-24 23:48:3917#include "base/numerics/safe_math.h"
Brett Wilson88ed598e52017-11-17 01:39:0118#include "base/strings/utf_string_conversions.h"
Robert Sesek75b27372019-08-29 14:03:1819#include "base/third_party/double_conversion/double-conversion/double-conversion.h"
brettw@chromium.org528c56d2010-07-30 19:28:4420
21namespace base {
22
23namespace {
24
jschuh7aa19b92015-09-24 23:48:3925template <typename STR, typename INT>
brettw@chromium.org528c56d2010-07-30 19:28:4426struct IntToStringT {
brettw@chromium.org528c56d2010-07-30 19:28:4427 static STR IntToString(INT value) {
28 // log10(2) ~= 0.3 bytes needed per bit or per byte log10(2**8) ~= 2.4.
29 // So round up to allocate 3 output characters per byte, plus 1 for '-'.
riceaad547d82015-09-25 19:27:5030 const size_t kOutputBufSize =
jschuh7aa19b92015-09-24 23:48:3931 3 * sizeof(INT) + std::numeric_limits<INT>::is_signed;
brettw@chromium.org528c56d2010-07-30 19:28:4432
riceaad547d82015-09-25 19:27:5033 // Create the string in a temporary buffer, write it back to front, and
brettw@chromium.org528c56d2010-07-30 19:28:4434 // then return the substr of what we ended up using.
riceaad547d82015-09-25 19:27:5035 using CHR = typename STR::value_type;
36 CHR outbuf[kOutputBufSize];
brettw@chromium.org528c56d2010-07-30 19:28:4437
jschuh7aa19b92015-09-24 23:48:3938 // The ValueOrDie call below can never fail, because UnsignedAbs is valid
39 // for all valid inputs.
jschuh2f220382016-12-02 18:08:4540 typename std::make_unsigned<INT>::type res =
jschuh565f9c72016-11-30 08:38:2441 CheckedNumeric<INT>(value).UnsignedAbs().ValueOrDie();
brettw@chromium.org528c56d2010-07-30 19:28:4442
riceaad547d82015-09-25 19:27:5043 CHR* end = outbuf + kOutputBufSize;
44 CHR* i = end;
pkasting@chromium.org30de3a32014-03-14 18:25:4845 do {
riceaad547d82015-09-25 19:27:5046 --i;
47 DCHECK(i != outbuf);
48 *i = static_cast<CHR>((res % 10) + '0');
brettw@chromium.org528c56d2010-07-30 19:28:4449 res /= 10;
pkasting@chromium.org30de3a32014-03-14 18:25:4850 } while (res != 0);
jschuh7aa19b92015-09-24 23:48:3951 if (IsValueNegative(value)) {
riceaad547d82015-09-25 19:27:5052 --i;
53 DCHECK(i != outbuf);
54 *i = static_cast<CHR>('-');
brettw@chromium.org528c56d2010-07-30 19:28:4455 }
riceaad547d82015-09-25 19:27:5056 return STR(i, end);
brettw@chromium.org528c56d2010-07-30 19:28:4457 }
58};
59
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3860// Utility to convert a character to a digit in a given base
61template<typename CHAR, int BASE, bool BASE_LTE_10> class BaseCharToDigit {
brettw@chromium.org528c56d2010-07-30 19:28:4462};
63
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3864// Faster specialization for bases <= 10
65template<typename CHAR, int BASE> class BaseCharToDigit<CHAR, BASE, true> {
brettw@chromium.org528c56d2010-07-30 19:28:4466 public:
avi84f37e12015-12-25 09:31:4267 static bool Convert(CHAR c, uint8_t* digit) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3868 if (c >= '0' && c < '0' + BASE) {
avi84f37e12015-12-25 09:31:4269 *digit = static_cast<uint8_t>(c - '0');
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3870 return true;
brettw@chromium.org528c56d2010-07-30 19:28:4471 }
brettw@chromium.org528c56d2010-07-30 19:28:4472 return false;
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3873 }
74};
75
76// Specialization for bases where 10 < base <= 36
77template<typename CHAR, int BASE> class BaseCharToDigit<CHAR, BASE, false> {
78 public:
avi84f37e12015-12-25 09:31:4279 static bool Convert(CHAR c, uint8_t* digit) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3880 if (c >= '0' && c <= '9') {
81 *digit = c - '0';
82 } else if (c >= 'a' && c < 'a' + BASE - 10) {
83 *digit = c - 'a' + 10;
84 } else if (c >= 'A' && c < 'A' + BASE - 10) {
85 *digit = c - 'A' + 10;
86 } else {
87 return false;
88 }
89 return true;
90 }
91};
92
avi84f37e12015-12-25 09:31:4293template <int BASE, typename CHAR>
94bool CharToDigit(CHAR c, uint8_t* digit) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:3895 return BaseCharToDigit<CHAR, BASE, BASE <= 10>::Convert(c, digit);
brettw@chromium.org528c56d2010-07-30 19:28:4496}
97
brettwb3413062015-06-24 00:39:0298// There is an IsUnicodeWhitespace for wchars defined in string_util.h, but it
99// is locale independent, whereas the functions we are replacing were
100// locale-dependent. TBD what is desired, but for the moment let's not
101// introduce a change in behaviour.
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38102template<typename CHAR> class WhitespaceHelper {
103};
104
105template<> class WhitespaceHelper<char> {
106 public:
107 static bool Invoke(char c) {
erikwright@chromium.orgeae2a822010-11-02 19:30:02108 return 0 != isspace(static_cast<unsigned char>(c));
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38109 }
110};
111
112template<> class WhitespaceHelper<char16> {
113 public:
114 static bool Invoke(char16 c) {
115 return 0 != iswspace(c);
116 }
117};
118
119template<typename CHAR> bool LocalIsWhitespace(CHAR c) {
120 return WhitespaceHelper<CHAR>::Invoke(c);
121}
122
123// IteratorRangeToNumberTraits should provide:
124// - a typedef for iterator_type, the iterator type used as input.
125// - a typedef for value_type, the target numeric type.
126// - static functions min, max (returning the minimum and maximum permitted
127// values)
128// - constant kBase, the base in which to interpret the input
129template<typename IteratorRangeToNumberTraits>
130class IteratorRangeToNumber {
131 public:
132 typedef IteratorRangeToNumberTraits traits;
133 typedef typename traits::iterator_type const_iterator;
134 typedef typename traits::value_type value_type;
135
136 // Generalized iterator-range-to-number conversion.
137 //
138 static bool Invoke(const_iterator begin,
139 const_iterator end,
140 value_type* output) {
141 bool valid = true;
142
143 while (begin != end && LocalIsWhitespace(*begin)) {
144 valid = false;
145 ++begin;
146 }
147
148 if (begin != end && *begin == '-') {
mostynb@opera.com2482a1952013-05-01 14:22:16149 if (!std::numeric_limits<value_type>::is_signed) {
davidben301864e2016-02-27 01:31:11150 *output = 0;
mostynb@opera.com2482a1952013-05-01 14:22:16151 valid = false;
152 } else if (!Negative::Invoke(begin + 1, end, output)) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38153 valid = false;
154 }
155 } else {
156 if (begin != end && *begin == '+') {
157 ++begin;
158 }
159 if (!Positive::Invoke(begin, end, output)) {
160 valid = false;
161 }
162 }
163
164 return valid;
165 }
166
167 private:
168 // Sign provides:
169 // - a static function, CheckBounds, that determines whether the next digit
170 // causes an overflow/underflow
171 // - a static function, Increment, that appends the next digit appropriately
172 // according to the sign of the number being parsed.
173 template<typename Sign>
174 class Base {
175 public:
176 static bool Invoke(const_iterator begin, const_iterator end,
177 typename traits::value_type* output) {
178 *output = 0;
179
180 if (begin == end) {
181 return false;
182 }
183
184 // Note: no performance difference was found when using template
185 // specialization to remove this check in bases other than 16
ali.akbar@gmail.com331580b2011-08-12 20:13:20186 if (traits::kBase == 16 && end - begin > 2 && *begin == '0' &&
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38187 (*(begin + 1) == 'x' || *(begin + 1) == 'X')) {
188 begin += 2;
189 }
190
191 for (const_iterator current = begin; current != end; ++current) {
avi84f37e12015-12-25 09:31:42192 uint8_t new_digit = 0;
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38193
194 if (!CharToDigit<traits::kBase>(*current, &new_digit)) {
195 return false;
196 }
197
198 if (current != begin) {
199 if (!Sign::CheckBounds(output, new_digit)) {
200 return false;
201 }
202 *output *= traits::kBase;
203 }
204
205 Sign::Increment(new_digit, output);
206 }
207 return true;
208 }
209 };
210
211 class Positive : public Base<Positive> {
212 public:
avi84f37e12015-12-25 09:31:42213 static bool CheckBounds(value_type* output, uint8_t new_digit) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38214 if (*output > static_cast<value_type>(traits::max() / traits::kBase) ||
215 (*output == static_cast<value_type>(traits::max() / traits::kBase) &&
216 new_digit > traits::max() % traits::kBase)) {
217 *output = traits::max();
218 return false;
219 }
220 return true;
221 }
avi84f37e12015-12-25 09:31:42222 static void Increment(uint8_t increment, value_type* output) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38223 *output += increment;
224 }
225 };
226
227 class Negative : public Base<Negative> {
228 public:
avi84f37e12015-12-25 09:31:42229 static bool CheckBounds(value_type* output, uint8_t new_digit) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38230 if (*output < traits::min() / traits::kBase ||
231 (*output == traits::min() / traits::kBase &&
232 new_digit > 0 - traits::min() % traits::kBase)) {
233 *output = traits::min();
234 return false;
235 }
236 return true;
237 }
avi84f37e12015-12-25 09:31:42238 static void Increment(uint8_t increment, value_type* output) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38239 *output -= increment;
240 }
241 };
242};
243
244template<typename ITERATOR, typename VALUE, int BASE>
245class BaseIteratorRangeToNumberTraits {
246 public:
247 typedef ITERATOR iterator_type;
248 typedef VALUE value_type;
249 static value_type min() {
250 return std::numeric_limits<value_type>::min();
251 }
252 static value_type max() {
253 return std::numeric_limits<value_type>::max();
254 }
255 static const int kBase = BASE;
256};
257
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38258template<typename ITERATOR>
259class BaseHexIteratorRangeToIntTraits
260 : public BaseIteratorRangeToNumberTraits<ITERATOR, int, 16> {
ahutter@chromium.orgce63d6b2012-12-20 02:46:28261};
262
avi84f37e12015-12-25 09:31:42263template <typename ITERATOR>
zverre@yandex-team.ru3fb01692013-10-23 13:37:04264class BaseHexIteratorRangeToUIntTraits
avi84f37e12015-12-25 09:31:42265 : public BaseIteratorRangeToNumberTraits<ITERATOR, uint32_t, 16> {};
zverre@yandex-team.ru3fb01692013-10-23 13:37:04266
avi84f37e12015-12-25 09:31:42267template <typename ITERATOR>
ahutter@chromium.orgce63d6b2012-12-20 02:46:28268class BaseHexIteratorRangeToInt64Traits
avi84f37e12015-12-25 09:31:42269 : public BaseIteratorRangeToNumberTraits<ITERATOR, int64_t, 16> {};
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38270
avi84f37e12015-12-25 09:31:42271template <typename ITERATOR>
felipeg@chromium.orgba4cd522013-04-12 14:38:11272class BaseHexIteratorRangeToUInt64Traits
avi84f37e12015-12-25 09:31:42273 : public BaseIteratorRangeToNumberTraits<ITERATOR, uint64_t, 16> {};
felipeg@chromium.orgba4cd522013-04-12 14:38:11274
tedvessenes@gmail.comeb72b272011-12-19 16:10:55275typedef BaseHexIteratorRangeToIntTraits<StringPiece::const_iterator>
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38276 HexIteratorRangeToIntTraits;
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38277
zverre@yandex-team.ru3fb01692013-10-23 13:37:04278typedef BaseHexIteratorRangeToUIntTraits<StringPiece::const_iterator>
279 HexIteratorRangeToUIntTraits;
280
ahutter@chromium.orgce63d6b2012-12-20 02:46:28281typedef BaseHexIteratorRangeToInt64Traits<StringPiece::const_iterator>
282 HexIteratorRangeToInt64Traits;
283
felipeg@chromium.orgba4cd522013-04-12 14:38:11284typedef BaseHexIteratorRangeToUInt64Traits<StringPiece::const_iterator>
285 HexIteratorRangeToUInt64Traits;
286
tedvessenes@gmail.comeb72b272011-12-19 16:10:55287template <typename VALUE, int BASE>
288class StringPieceToNumberTraits
289 : public BaseIteratorRangeToNumberTraits<StringPiece::const_iterator,
290 VALUE,
ahutter@chromium.orgce63d6b2012-12-20 02:46:28291 BASE> {
292};
tedvessenes@gmail.comeb72b272011-12-19 16:10:55293
294template <typename VALUE>
Reilly Grant39aecc32018-01-04 00:52:52295bool StringToIntImpl(StringPiece input, VALUE* output) {
tedvessenes@gmail.comeb72b272011-12-19 16:10:55296 return IteratorRangeToNumber<StringPieceToNumberTraits<VALUE, 10> >::Invoke(
297 input.begin(), input.end(), output);
298}
299
300template <typename VALUE, int BASE>
301class StringPiece16ToNumberTraits
302 : public BaseIteratorRangeToNumberTraits<StringPiece16::const_iterator,
303 VALUE,
ahutter@chromium.orgce63d6b2012-12-20 02:46:28304 BASE> {
305};
tedvessenes@gmail.comeb72b272011-12-19 16:10:55306
307template <typename VALUE>
Reilly Grant39aecc32018-01-04 00:52:52308bool String16ToIntImpl(StringPiece16 input, VALUE* output) {
tedvessenes@gmail.comeb72b272011-12-19 16:10:55309 return IteratorRangeToNumber<StringPiece16ToNumberTraits<VALUE, 10> >::Invoke(
310 input.begin(), input.end(), output);
311}
312
brettw@chromium.org528c56d2010-07-30 19:28:44313} // namespace
314
Daniel Cheng3d199b12017-12-12 03:51:09315std::string NumberToString(int value) {
316 return IntToStringT<std::string, int>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44317}
318
Daniel Cheng3d199b12017-12-12 03:51:09319string16 NumberToString16(int value) {
320 return IntToStringT<string16, int>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44321}
322
Daniel Cheng3d199b12017-12-12 03:51:09323std::string NumberToString(unsigned value) {
324 return IntToStringT<std::string, unsigned>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44325}
326
Daniel Cheng3d199b12017-12-12 03:51:09327string16 NumberToString16(unsigned value) {
328 return IntToStringT<string16, unsigned>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44329}
330
Daniel Cheng3d199b12017-12-12 03:51:09331std::string NumberToString(long value) {
332 return IntToStringT<std::string, long>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44333}
334
Daniel Cheng3d199b12017-12-12 03:51:09335string16 NumberToString16(long value) {
336 return IntToStringT<string16, long>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44337}
338
Daniel Cheng3d199b12017-12-12 03:51:09339std::string NumberToString(unsigned long value) {
340 return IntToStringT<std::string, unsigned long>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44341}
342
Daniel Cheng3d199b12017-12-12 03:51:09343string16 NumberToString16(unsigned long value) {
344 return IntToStringT<string16, unsigned long>::IntToString(value);
wtc@chromium.org1c0fb252014-06-27 19:10:38345}
346
Daniel Cheng3d199b12017-12-12 03:51:09347std::string NumberToString(long long value) {
348 return IntToStringT<std::string, long long>::IntToString(value);
wtc@chromium.org1c0fb252014-06-27 19:10:38349}
350
Daniel Cheng3d199b12017-12-12 03:51:09351string16 NumberToString16(long long value) {
352 return IntToStringT<string16, long long>::IntToString(value);
brettw@chromium.org528c56d2010-07-30 19:28:44353}
Daniel Cheng3d199b12017-12-12 03:51:09354
355std::string NumberToString(unsigned long long value) {
356 return IntToStringT<std::string, unsigned long long>::IntToString(value);
357}
358
359string16 NumberToString16(unsigned long long value) {
360 return IntToStringT<string16, unsigned long long>::IntToString(value);
361}
brettw@chromium.org528c56d2010-07-30 19:28:44362
Robert Sesek75b27372019-08-29 14:03:18363static const double_conversion::DoubleToStringConverter*
364GetDoubleToStringConverter() {
365 static NoDestructor<double_conversion::DoubleToStringConverter> converter(
366 double_conversion::DoubleToStringConverter::EMIT_POSITIVE_EXPONENT_SIGN,
367 nullptr, nullptr, 'e', -6, 12, 0, 0);
368 return converter.get();
369}
370
Brett Wilson88ed598e52017-11-17 01:39:01371std::string NumberToString(double value) {
brettw@chromium.org528c56d2010-07-30 19:28:44372 char buffer[32];
Robert Sesek75b27372019-08-29 14:03:18373 double_conversion::StringBuilder builder(buffer, sizeof(buffer));
374 GetDoubleToStringConverter()->ToShortest(value, &builder);
375 return std::string(buffer, builder.position());
brettw@chromium.org528c56d2010-07-30 19:28:44376}
377
Brett Wilson88ed598e52017-11-17 01:39:01378base::string16 NumberToString16(double value) {
Brett Wilson88ed598e52017-11-17 01:39:01379 char buffer[32];
Robert Sesek75b27372019-08-29 14:03:18380 double_conversion::StringBuilder builder(buffer, sizeof(buffer));
381 GetDoubleToStringConverter()->ToShortest(value, &builder);
Brett Wilson88ed598e52017-11-17 01:39:01382
383 // The number will be ASCII. This creates the string using the "input
384 // iterator" variant which promotes from 8-bit to 16-bit via "=".
Robert Sesek75b27372019-08-29 14:03:18385 return base::string16(&buffer[0], &buffer[builder.position()]);
Brett Wilson88ed598e52017-11-17 01:39:01386}
387
Reilly Grant39aecc32018-01-04 00:52:52388bool StringToInt(StringPiece input, int* output) {
tedvessenes@gmail.comeb72b272011-12-19 16:10:55389 return StringToIntImpl(input, output);
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38390}
391
Reilly Grant39aecc32018-01-04 00:52:52392bool StringToInt(StringPiece16 input, int* output) {
tedvessenes@gmail.comeb72b272011-12-19 16:10:55393 return String16ToIntImpl(input, output);
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38394}
395
Reilly Grant39aecc32018-01-04 00:52:52396bool StringToUint(StringPiece input, unsigned* output) {
yoz@chromium.orgd1bafad2012-01-28 01:02:17397 return StringToIntImpl(input, output);
398}
399
Reilly Grant39aecc32018-01-04 00:52:52400bool StringToUint(StringPiece16 input, unsigned* output) {
yoz@chromium.orgd1bafad2012-01-28 01:02:17401 return String16ToIntImpl(input, output);
402}
403
Reilly Grant39aecc32018-01-04 00:52:52404bool StringToInt64(StringPiece input, int64_t* output) {
tedvessenes@gmail.comeb72b272011-12-19 16:10:55405 return StringToIntImpl(input, output);
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38406}
407
Reilly Grant39aecc32018-01-04 00:52:52408bool StringToInt64(StringPiece16 input, int64_t* output) {
tedvessenes@gmail.comeb72b272011-12-19 16:10:55409 return String16ToIntImpl(input, output);
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38410}
411
Reilly Grant39aecc32018-01-04 00:52:52412bool StringToUint64(StringPiece input, uint64_t* output) {
kalman@chromium.orgd2d0b6b2012-01-26 00:27:29413 return StringToIntImpl(input, output);
414}
415
Reilly Grant39aecc32018-01-04 00:52:52416bool StringToUint64(StringPiece16 input, uint64_t* output) {
kalman@chromium.orgd2d0b6b2012-01-26 00:27:29417 return String16ToIntImpl(input, output);
418}
419
Reilly Grant39aecc32018-01-04 00:52:52420bool StringToSizeT(StringPiece input, size_t* output) {
kalman@chromium.org4420d93272012-01-28 03:30:17421 return StringToIntImpl(input, output);
422}
423
Reilly Grant39aecc32018-01-04 00:52:52424bool StringToSizeT(StringPiece16 input, size_t* output) {
kalman@chromium.org4420d93272012-01-28 03:30:17425 return String16ToIntImpl(input, output);
426}
427
brettw@chromium.org528c56d2010-07-30 19:28:44428bool StringToDouble(const std::string& input, double* output) {
Robert Sesek75b27372019-08-29 14:03:18429 static NoDestructor<double_conversion::StringToDoubleConverter> converter(
430 double_conversion::StringToDoubleConverter::ALLOW_LEADING_SPACES |
431 double_conversion::StringToDoubleConverter::ALLOW_TRAILING_JUNK,
432 0.0, 0, nullptr, nullptr);
yusukes@chromium.org34d58a22013-05-02 23:06:26433
Robert Sesek75b27372019-08-29 14:03:18434 int processed_characters_count;
435 *output = converter->StringToDouble(input.c_str(), input.size(),
436 &processed_characters_count);
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38437
438 // Cases to return false:
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38439 // - If the input string is empty, there was nothing to parse.
Robert Sesek75b27372019-08-29 14:03:18440 // - If the value saturated to HUGE_VAL.
441 // - If the entire string was not processed, there are either characters
442 // remaining in the string after a parsed number, or the string does not
443 // begin with a parseable number.
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38444 // - If the first character is a space, there was leading whitespace
Robert Sesek75b27372019-08-29 14:03:18445 return !input.empty() && *output != HUGE_VAL && *output != -HUGE_VAL &&
446 static_cast<size_t>(processed_characters_count) == input.size() &&
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38447 !isspace(input[0]);
brettw@chromium.org528c56d2010-07-30 19:28:44448}
449
450// Note: if you need to add String16ToDouble, first ask yourself if it's
451// really necessary. If it is, probably the best implementation here is to
452// convert to 8-bit and then use the 8-bit version.
453
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38454// Note: if you need to add an iterator range version of StringToDouble, first
455// ask yourself if it's really necessary. If it is, probably the best
456// implementation here is to instantiate a string and use the string version.
457
brettw@chromium.org528c56d2010-07-30 19:28:44458std::string HexEncode(const void* bytes, size_t size) {
459 static const char kHexChars[] = "0123456789ABCDEF";
460
461 // Each input byte creates two output hex characters.
462 std::string ret(size * 2, '\0');
463
464 for (size_t i = 0; i < size; ++i) {
465 char b = reinterpret_cast<const char*>(bytes)[i];
466 ret[(i * 2)] = kHexChars[(b >> 4) & 0xf];
467 ret[(i * 2) + 1] = kHexChars[b & 0xf];
468 }
469 return ret;
470}
471
Adam Langley6d144b72019-08-01 00:29:22472std::string HexEncode(base::span<const uint8_t> bytes) {
473 return HexEncode(bytes.data(), bytes.size());
474}
475
Reilly Grant39aecc32018-01-04 00:52:52476bool HexStringToInt(StringPiece input, int* output) {
erikwright@chromium.orgcfcf2da2010-10-21 14:05:38477 return IteratorRangeToNumber<HexIteratorRangeToIntTraits>::Invoke(
478 input.begin(), input.end(), output);
479}
480
Reilly Grant39aecc32018-01-04 00:52:52481bool HexStringToUInt(StringPiece input, uint32_t* output) {
zverre@yandex-team.ru3fb01692013-10-23 13:37:04482 return IteratorRangeToNumber<HexIteratorRangeToUIntTraits>::Invoke(
483 input.begin(), input.end(), output);
484}
485
Reilly Grant39aecc32018-01-04 00:52:52486bool HexStringToInt64(StringPiece input, int64_t* output) {
ahutter@chromium.orgce63d6b2012-12-20 02:46:28487 return IteratorRangeToNumber<HexIteratorRangeToInt64Traits>::Invoke(
488 input.begin(), input.end(), output);
489}
490
Reilly Grant39aecc32018-01-04 00:52:52491bool HexStringToUInt64(StringPiece input, uint64_t* output) {
felipeg@chromium.orgba4cd522013-04-12 14:38:11492 return IteratorRangeToNumber<HexIteratorRangeToUInt64Traits>::Invoke(
493 input.begin(), input.end(), output);
494}
495
Reilly Grant39aecc32018-01-04 00:52:52496bool HexStringToBytes(StringPiece input, std::vector<uint8_t>* output) {
Reilly Grante61f2112018-01-03 18:41:45497 DCHECK_EQ(output->size(), 0u);
498 size_t count = input.size();
499 if (count == 0 || (count % 2) != 0)
500 return false;
501 for (uintptr_t i = 0; i < count / 2; ++i) {
502 uint8_t msb = 0; // most significant 4 bits
503 uint8_t lsb = 0; // least significant 4 bits
504 if (!CharToDigit<16>(input[i * 2], &msb) ||
505 !CharToDigit<16>(input[i * 2 + 1], &lsb)) {
506 return false;
507 }
508 output->push_back((msb << 4) | lsb);
509 }
510 return true;
brettw@chromium.org528c56d2010-07-30 19:28:44511}
512
513} // namespace base