itoa.h
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2 //
3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
4 //
5 // Licensed under the MIT License (the "License"); you may not use this file except
6 // in compliance with the License. You may obtain a copy of the License at
7 //
8 // http://opensource.org/licenses/MIT
9 //
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13 // specific language governing permissions and limitations under the License.
14 
15 #ifndef RAPIDJSON_ITOA_
16 #define RAPIDJSON_ITOA_
17 
18 #include "../rapidjson.h"
19 
20 RAPIDJSON_NAMESPACE_BEGIN
21 namespace internal {
22 
23 inline const char* GetDigitsLut() {
24  static const char cDigitsLut[200] = {
25  '0','0','0','1','0','2','0','3','0','4','0','5','0','6','0','7','0','8','0','9',
26  '1','0','1','1','1','2','1','3','1','4','1','5','1','6','1','7','1','8','1','9',
27  '2','0','2','1','2','2','2','3','2','4','2','5','2','6','2','7','2','8','2','9',
28  '3','0','3','1','3','2','3','3','3','4','3','5','3','6','3','7','3','8','3','9',
29  '4','0','4','1','4','2','4','3','4','4','4','5','4','6','4','7','4','8','4','9',
30  '5','0','5','1','5','2','5','3','5','4','5','5','5','6','5','7','5','8','5','9',
31  '6','0','6','1','6','2','6','3','6','4','6','5','6','6','6','7','6','8','6','9',
32  '7','0','7','1','7','2','7','3','7','4','7','5','7','6','7','7','7','8','7','9',
33  '8','0','8','1','8','2','8','3','8','4','8','5','8','6','8','7','8','8','8','9',
34  '9','0','9','1','9','2','9','3','9','4','9','5','9','6','9','7','9','8','9','9'
35  };
36  return cDigitsLut;
37 }
38 
39 inline char* u32toa(uint32_t value, char* buffer) {
40  RAPIDJSON_ASSERT(buffer != 0);
41 
42  const char* cDigitsLut = GetDigitsLut();
43 
44  if (value < 10000) {
45  const uint32_t d1 = (value / 100) << 1;
46  const uint32_t d2 = (value % 100) << 1;
47 
48  if (value >= 1000)
49  *buffer++ = cDigitsLut[d1];
50  if (value >= 100)
51  *buffer++ = cDigitsLut[d1 + 1];
52  if (value >= 10)
53  *buffer++ = cDigitsLut[d2];
54  *buffer++ = cDigitsLut[d2 + 1];
55  }
56  else if (value < 100000000) {
57  // value = bbbbcccc
58  const uint32_t b = value / 10000;
59  const uint32_t c = value % 10000;
60 
61  const uint32_t d1 = (b / 100) << 1;
62  const uint32_t d2 = (b % 100) << 1;
63 
64  const uint32_t d3 = (c / 100) << 1;
65  const uint32_t d4 = (c % 100) << 1;
66 
67  if (value >= 10000000)
68  *buffer++ = cDigitsLut[d1];
69  if (value >= 1000000)
70  *buffer++ = cDigitsLut[d1 + 1];
71  if (value >= 100000)
72  *buffer++ = cDigitsLut[d2];
73  *buffer++ = cDigitsLut[d2 + 1];
74 
75  *buffer++ = cDigitsLut[d3];
76  *buffer++ = cDigitsLut[d3 + 1];
77  *buffer++ = cDigitsLut[d4];
78  *buffer++ = cDigitsLut[d4 + 1];
79  }
80  else {
81  // value = aabbbbcccc in decimal
82 
83  const uint32_t a = value / 100000000; // 1 to 42
84  value %= 100000000;
85 
86  if (a >= 10) {
87  const unsigned i = a << 1;
88  *buffer++ = cDigitsLut[i];
89  *buffer++ = cDigitsLut[i + 1];
90  }
91  else
92  *buffer++ = static_cast<char>('0' + static_cast<char>(a));
93 
94  const uint32_t b = value / 10000; // 0 to 9999
95  const uint32_t c = value % 10000; // 0 to 9999
96 
97  const uint32_t d1 = (b / 100) << 1;
98  const uint32_t d2 = (b % 100) << 1;
99 
100  const uint32_t d3 = (c / 100) << 1;
101  const uint32_t d4 = (c % 100) << 1;
102 
103  *buffer++ = cDigitsLut[d1];
104  *buffer++ = cDigitsLut[d1 + 1];
105  *buffer++ = cDigitsLut[d2];
106  *buffer++ = cDigitsLut[d2 + 1];
107  *buffer++ = cDigitsLut[d3];
108  *buffer++ = cDigitsLut[d3 + 1];
109  *buffer++ = cDigitsLut[d4];
110  *buffer++ = cDigitsLut[d4 + 1];
111  }
112  return buffer;
113 }
114 
115 inline char* i32toa(int32_t value, char* buffer) {
116  RAPIDJSON_ASSERT(buffer != 0);
117  uint32_t u = static_cast<uint32_t>(value);
118  if (value < 0) {
119  *buffer++ = '-';
120  u = ~u + 1;
121  }
122 
123  return u32toa(u, buffer);
124 }
125 
126 inline char* u64toa(uint64_t value, char* buffer) {
127  RAPIDJSON_ASSERT(buffer != 0);
128  const char* cDigitsLut = GetDigitsLut();
129  const uint64_t kTen8 = 100000000;
130  const uint64_t kTen9 = kTen8 * 10;
131  const uint64_t kTen10 = kTen8 * 100;
132  const uint64_t kTen11 = kTen8 * 1000;
133  const uint64_t kTen12 = kTen8 * 10000;
134  const uint64_t kTen13 = kTen8 * 100000;
135  const uint64_t kTen14 = kTen8 * 1000000;
136  const uint64_t kTen15 = kTen8 * 10000000;
137  const uint64_t kTen16 = kTen8 * kTen8;
138 
139  if (value < kTen8) {
140  uint32_t v = static_cast<uint32_t>(value);
141  if (v < 10000) {
142  const uint32_t d1 = (v / 100) << 1;
143  const uint32_t d2 = (v % 100) << 1;
144 
145  if (v >= 1000)
146  *buffer++ = cDigitsLut[d1];
147  if (v >= 100)
148  *buffer++ = cDigitsLut[d1 + 1];
149  if (v >= 10)
150  *buffer++ = cDigitsLut[d2];
151  *buffer++ = cDigitsLut[d2 + 1];
152  }
153  else {
154  // value = bbbbcccc
155  const uint32_t b = v / 10000;
156  const uint32_t c = v % 10000;
157 
158  const uint32_t d1 = (b / 100) << 1;
159  const uint32_t d2 = (b % 100) << 1;
160 
161  const uint32_t d3 = (c / 100) << 1;
162  const uint32_t d4 = (c % 100) << 1;
163 
164  if (value >= 10000000)
165  *buffer++ = cDigitsLut[d1];
166  if (value >= 1000000)
167  *buffer++ = cDigitsLut[d1 + 1];
168  if (value >= 100000)
169  *buffer++ = cDigitsLut[d2];
170  *buffer++ = cDigitsLut[d2 + 1];
171 
172  *buffer++ = cDigitsLut[d3];
173  *buffer++ = cDigitsLut[d3 + 1];
174  *buffer++ = cDigitsLut[d4];
175  *buffer++ = cDigitsLut[d4 + 1];
176  }
177  }
178  else if (value < kTen16) {
179  const uint32_t v0 = static_cast<uint32_t>(value / kTen8);
180  const uint32_t v1 = static_cast<uint32_t>(value % kTen8);
181 
182  const uint32_t b0 = v0 / 10000;
183  const uint32_t c0 = v0 % 10000;
184 
185  const uint32_t d1 = (b0 / 100) << 1;
186  const uint32_t d2 = (b0 % 100) << 1;
187 
188  const uint32_t d3 = (c0 / 100) << 1;
189  const uint32_t d4 = (c0 % 100) << 1;
190 
191  const uint32_t b1 = v1 / 10000;
192  const uint32_t c1 = v1 % 10000;
193 
194  const uint32_t d5 = (b1 / 100) << 1;
195  const uint32_t d6 = (b1 % 100) << 1;
196 
197  const uint32_t d7 = (c1 / 100) << 1;
198  const uint32_t d8 = (c1 % 100) << 1;
199 
200  if (value >= kTen15)
201  *buffer++ = cDigitsLut[d1];
202  if (value >= kTen14)
203  *buffer++ = cDigitsLut[d1 + 1];
204  if (value >= kTen13)
205  *buffer++ = cDigitsLut[d2];
206  if (value >= kTen12)
207  *buffer++ = cDigitsLut[d2 + 1];
208  if (value >= kTen11)
209  *buffer++ = cDigitsLut[d3];
210  if (value >= kTen10)
211  *buffer++ = cDigitsLut[d3 + 1];
212  if (value >= kTen9)
213  *buffer++ = cDigitsLut[d4];
214 
215  *buffer++ = cDigitsLut[d4 + 1];
216  *buffer++ = cDigitsLut[d5];
217  *buffer++ = cDigitsLut[d5 + 1];
218  *buffer++ = cDigitsLut[d6];
219  *buffer++ = cDigitsLut[d6 + 1];
220  *buffer++ = cDigitsLut[d7];
221  *buffer++ = cDigitsLut[d7 + 1];
222  *buffer++ = cDigitsLut[d8];
223  *buffer++ = cDigitsLut[d8 + 1];
224  }
225  else {
226  const uint32_t a = static_cast<uint32_t>(value / kTen16); // 1 to 1844
227  value %= kTen16;
228 
229  if (a < 10)
230  *buffer++ = static_cast<char>('0' + static_cast<char>(a));
231  else if (a < 100) {
232  const uint32_t i = a << 1;
233  *buffer++ = cDigitsLut[i];
234  *buffer++ = cDigitsLut[i + 1];
235  }
236  else if (a < 1000) {
237  *buffer++ = static_cast<char>('0' + static_cast<char>(a / 100));
238 
239  const uint32_t i = (a % 100) << 1;
240  *buffer++ = cDigitsLut[i];
241  *buffer++ = cDigitsLut[i + 1];
242  }
243  else {
244  const uint32_t i = (a / 100) << 1;
245  const uint32_t j = (a % 100) << 1;
246  *buffer++ = cDigitsLut[i];
247  *buffer++ = cDigitsLut[i + 1];
248  *buffer++ = cDigitsLut[j];
249  *buffer++ = cDigitsLut[j + 1];
250  }
251 
252  const uint32_t v0 = static_cast<uint32_t>(value / kTen8);
253  const uint32_t v1 = static_cast<uint32_t>(value % kTen8);
254 
255  const uint32_t b0 = v0 / 10000;
256  const uint32_t c0 = v0 % 10000;
257 
258  const uint32_t d1 = (b0 / 100) << 1;
259  const uint32_t d2 = (b0 % 100) << 1;
260 
261  const uint32_t d3 = (c0 / 100) << 1;
262  const uint32_t d4 = (c0 % 100) << 1;
263 
264  const uint32_t b1 = v1 / 10000;
265  const uint32_t c1 = v1 % 10000;
266 
267  const uint32_t d5 = (b1 / 100) << 1;
268  const uint32_t d6 = (b1 % 100) << 1;
269 
270  const uint32_t d7 = (c1 / 100) << 1;
271  const uint32_t d8 = (c1 % 100) << 1;
272 
273  *buffer++ = cDigitsLut[d1];
274  *buffer++ = cDigitsLut[d1 + 1];
275  *buffer++ = cDigitsLut[d2];
276  *buffer++ = cDigitsLut[d2 + 1];
277  *buffer++ = cDigitsLut[d3];
278  *buffer++ = cDigitsLut[d3 + 1];
279  *buffer++ = cDigitsLut[d4];
280  *buffer++ = cDigitsLut[d4 + 1];
281  *buffer++ = cDigitsLut[d5];
282  *buffer++ = cDigitsLut[d5 + 1];
283  *buffer++ = cDigitsLut[d6];
284  *buffer++ = cDigitsLut[d6 + 1];
285  *buffer++ = cDigitsLut[d7];
286  *buffer++ = cDigitsLut[d7 + 1];
287  *buffer++ = cDigitsLut[d8];
288  *buffer++ = cDigitsLut[d8 + 1];
289  }
290 
291  return buffer;
292 }
293 
294 inline char* i64toa(int64_t value, char* buffer) {
295  RAPIDJSON_ASSERT(buffer != 0);
296  uint64_t u = static_cast<uint64_t>(value);
297  if (value < 0) {
298  *buffer++ = '-';
299  u = ~u + 1;
300  }
301 
302  return u64toa(u, buffer);
303 }
304 
305 } // namespace internal
306 RAPIDJSON_NAMESPACE_END
307 
308 #endif // RAPIDJSON_ITOA_
internal::u64toa
char * u64toa(uint64_t value, char *buffer)
Definition: itoa.h:126
RAPIDJSON_ASSERT
#define RAPIDJSON_ASSERT(x)
Assertion.
Definition: rapidjson.h:406
RAPIDJSON_NAMESPACE_END
#define RAPIDJSON_NAMESPACE_END
provide custom rapidjson namespace (closing expression)
Definition: rapidjson.h:124
internal::GetDigitsLut
const char * GetDigitsLut()
Definition: itoa.h:23
RAPIDJSON_NAMESPACE_BEGIN
#define RAPIDJSON_NAMESPACE_BEGIN
provide custom rapidjson namespace (opening expression)
Definition: rapidjson.h:121
uint32_t
unsigned int uint32_t
Definition: stdint.h:126
uint64_t
unsigned __int64 uint64_t
Definition: stdint.h:136
internal::u32toa
char * u32toa(uint32_t value, char *buffer)
Definition: itoa.h:39
a
const GenericPointer< typename T::ValueType > T2 T::AllocatorType & a
Definition: pointer.h:1124
value
const GenericPointer< typename T::ValueType > T2 value
Definition: pointer.h:1225
int64_t
signed __int64 int64_t
Definition: stdint.h:135
b
static bool * b
Definition: config.cpp:1043
int32_t
signed int int32_t
Definition: stdint.h:123
internal::i64toa
char * i64toa(int64_t value, char *buffer)
Definition: itoa.h:294
internal::i32toa
char * i32toa(int32_t value, char *buffer)
Definition: itoa.h:115
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