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itoa.h
1// Tencent is pleased to support the open source community by making RapidJSON available.
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//
10// Unless required by applicable law or agreed to in writing, software distributed
11// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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
20RAPIDJSON_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 const char* cDigitsLut = GetDigitsLut();
41
42 if (value < 10000) {
43 const uint32_t d1 = (value / 100) << 1;
44 const uint32_t d2 = (value % 100) << 1;
45
46 if (value >= 1000)
47 *buffer++ = cDigitsLut[d1];
48 if (value >= 100)
49 *buffer++ = cDigitsLut[d1 + 1];
50 if (value >= 10)
51 *buffer++ = cDigitsLut[d2];
52 *buffer++ = cDigitsLut[d2 + 1];
53 }
54 else if (value < 100000000) {
55 // value = bbbbcccc
56 const uint32_t b = value / 10000;
57 const uint32_t c = value % 10000;
58
59 const uint32_t d1 = (b / 100) << 1;
60 const uint32_t d2 = (b % 100) << 1;
61
62 const uint32_t d3 = (c / 100) << 1;
63 const uint32_t d4 = (c % 100) << 1;
64
65 if (value >= 10000000)
66 *buffer++ = cDigitsLut[d1];
67 if (value >= 1000000)
68 *buffer++ = cDigitsLut[d1 + 1];
69 if (value >= 100000)
70 *buffer++ = cDigitsLut[d2];
71 *buffer++ = cDigitsLut[d2 + 1];
72
73 *buffer++ = cDigitsLut[d3];
74 *buffer++ = cDigitsLut[d3 + 1];
75 *buffer++ = cDigitsLut[d4];
76 *buffer++ = cDigitsLut[d4 + 1];
77 }
78 else {
79 // value = aabbbbcccc in decimal
80
81 const uint32_t a = value / 100000000; // 1 to 42
82 value %= 100000000;
83
84 if (a >= 10) {
85 const unsigned i = a << 1;
86 *buffer++ = cDigitsLut[i];
87 *buffer++ = cDigitsLut[i + 1];
88 }
89 else
90 *buffer++ = static_cast<char>('0' + static_cast<char>(a));
91
92 const uint32_t b = value / 10000; // 0 to 9999
93 const uint32_t c = value % 10000; // 0 to 9999
94
95 const uint32_t d1 = (b / 100) << 1;
96 const uint32_t d2 = (b % 100) << 1;
97
98 const uint32_t d3 = (c / 100) << 1;
99 const uint32_t d4 = (c % 100) << 1;
100
101 *buffer++ = cDigitsLut[d1];
102 *buffer++ = cDigitsLut[d1 + 1];
103 *buffer++ = cDigitsLut[d2];
104 *buffer++ = cDigitsLut[d2 + 1];
105 *buffer++ = cDigitsLut[d3];
106 *buffer++ = cDigitsLut[d3 + 1];
107 *buffer++ = cDigitsLut[d4];
108 *buffer++ = cDigitsLut[d4 + 1];
109 }
110 return buffer;
111}
112
113 inline char* i32toa(int32_t value, char* buffer) {
114 uint32_t u = static_cast<uint32_t>(value);
115 if (value < 0) {
116 *buffer++ = '-';
117 u = ~u + 1;
118 }
119
120 return u32toa(u, buffer);
121}
122
123 inline char* u64toa(uint64_t value, char* buffer) {
124 const char* cDigitsLut = GetDigitsLut();
125 const uint64_t kTen8 = 100000000;
126 const uint64_t kTen9 = kTen8 * 10;
127 const uint64_t kTen10 = kTen8 * 100;
128 const uint64_t kTen11 = kTen8 * 1000;
129 const uint64_t kTen12 = kTen8 * 10000;
130 const uint64_t kTen13 = kTen8 * 100000;
131 const uint64_t kTen14 = kTen8 * 1000000;
132 const uint64_t kTen15 = kTen8 * 10000000;
133 const uint64_t kTen16 = kTen8 * kTen8;
134
135 if (value < kTen8) {
136 uint32_t v = static_cast<uint32_t>(value);
137 if (v < 10000) {
138 const uint32_t d1 = (v / 100) << 1;
139 const uint32_t d2 = (v % 100) << 1;
140
141 if (v >= 1000)
142 *buffer++ = cDigitsLut[d1];
143 if (v >= 100)
144 *buffer++ = cDigitsLut[d1 + 1];
145 if (v >= 10)
146 *buffer++ = cDigitsLut[d2];
147 *buffer++ = cDigitsLut[d2 + 1];
148 }
149 else {
150 // value = bbbbcccc
151 const uint32_t b = v / 10000;
152 const uint32_t c = v % 10000;
153
154 const uint32_t d1 = (b / 100) << 1;
155 const uint32_t d2 = (b % 100) << 1;
156
157 const uint32_t d3 = (c / 100) << 1;
158 const uint32_t d4 = (c % 100) << 1;
159
160 if (value >= 10000000)
161 *buffer++ = cDigitsLut[d1];
162 if (value >= 1000000)
163 *buffer++ = cDigitsLut[d1 + 1];
164 if (value >= 100000)
165 *buffer++ = cDigitsLut[d2];
166 *buffer++ = cDigitsLut[d2 + 1];
167
168 *buffer++ = cDigitsLut[d3];
169 *buffer++ = cDigitsLut[d3 + 1];
170 *buffer++ = cDigitsLut[d4];
171 *buffer++ = cDigitsLut[d4 + 1];
172 }
173 }
174 else if (value < kTen16) {
175 const uint32_t v0 = static_cast<uint32_t>(value / kTen8);
176 const uint32_t v1 = static_cast<uint32_t>(value % kTen8);
177
178 const uint32_t b0 = v0 / 10000;
179 const uint32_t c0 = v0 % 10000;
180
181 const uint32_t d1 = (b0 / 100) << 1;
182 const uint32_t d2 = (b0 % 100) << 1;
183
184 const uint32_t d3 = (c0 / 100) << 1;
185 const uint32_t d4 = (c0 % 100) << 1;
186
187 const uint32_t b1 = v1 / 10000;
188 const uint32_t c1 = v1 % 10000;
189
190 const uint32_t d5 = (b1 / 100) << 1;
191 const uint32_t d6 = (b1 % 100) << 1;
192
193 const uint32_t d7 = (c1 / 100) << 1;
194 const uint32_t d8 = (c1 % 100) << 1;
195
196 if (value >= kTen15)
197 *buffer++ = cDigitsLut[d1];
198 if (value >= kTen14)
199 *buffer++ = cDigitsLut[d1 + 1];
200 if (value >= kTen13)
201 *buffer++ = cDigitsLut[d2];
202 if (value >= kTen12)
203 *buffer++ = cDigitsLut[d2 + 1];
204 if (value >= kTen11)
205 *buffer++ = cDigitsLut[d3];
206 if (value >= kTen10)
207 *buffer++ = cDigitsLut[d3 + 1];
208 if (value >= kTen9)
209 *buffer++ = cDigitsLut[d4];
210 if (value >= kTen8)
211 *buffer++ = cDigitsLut[d4 + 1];
212
213 *buffer++ = cDigitsLut[d5];
214 *buffer++ = cDigitsLut[d5 + 1];
215 *buffer++ = cDigitsLut[d6];
216 *buffer++ = cDigitsLut[d6 + 1];
217 *buffer++ = cDigitsLut[d7];
218 *buffer++ = cDigitsLut[d7 + 1];
219 *buffer++ = cDigitsLut[d8];
220 *buffer++ = cDigitsLut[d8 + 1];
221 }
222 else {
223 const uint32_t a = static_cast<uint32_t>(value / kTen16); // 1 to 1844
224 value %= kTen16;
225
226 if (a < 10)
227 *buffer++ = static_cast<char>('0' + static_cast<char>(a));
228 else if (a < 100) {
229 const uint32_t i = a << 1;
230 *buffer++ = cDigitsLut[i];
231 *buffer++ = cDigitsLut[i + 1];
232 }
233 else if (a < 1000) {
234 *buffer++ = static_cast<char>('0' + static_cast<char>(a / 100));
235
236 const uint32_t i = (a % 100) << 1;
237 *buffer++ = cDigitsLut[i];
238 *buffer++ = cDigitsLut[i + 1];
239 }
240 else {
241 const uint32_t i = (a / 100) << 1;
242 const uint32_t j = (a % 100) << 1;
243 *buffer++ = cDigitsLut[i];
244 *buffer++ = cDigitsLut[i + 1];
245 *buffer++ = cDigitsLut[j];
246 *buffer++ = cDigitsLut[j + 1];
247 }
248
249 const uint32_t v0 = static_cast<uint32_t>(value / kTen8);
250 const uint32_t v1 = static_cast<uint32_t>(value % kTen8);
251
252 const uint32_t b0 = v0 / 10000;
253 const uint32_t c0 = v0 % 10000;
254
255 const uint32_t d1 = (b0 / 100) << 1;
256 const uint32_t d2 = (b0 % 100) << 1;
257
258 const uint32_t d3 = (c0 / 100) << 1;
259 const uint32_t d4 = (c0 % 100) << 1;
260
261 const uint32_t b1 = v1 / 10000;
262 const uint32_t c1 = v1 % 10000;
263
264 const uint32_t d5 = (b1 / 100) << 1;
265 const uint32_t d6 = (b1 % 100) << 1;
266
267 const uint32_t d7 = (c1 / 100) << 1;
268 const uint32_t d8 = (c1 % 100) << 1;
269
270 *buffer++ = cDigitsLut[d1];
271 *buffer++ = cDigitsLut[d1 + 1];
272 *buffer++ = cDigitsLut[d2];
273 *buffer++ = cDigitsLut[d2 + 1];
274 *buffer++ = cDigitsLut[d3];
275 *buffer++ = cDigitsLut[d3 + 1];
276 *buffer++ = cDigitsLut[d4];
277 *buffer++ = cDigitsLut[d4 + 1];
278 *buffer++ = cDigitsLut[d5];
279 *buffer++ = cDigitsLut[d5 + 1];
280 *buffer++ = cDigitsLut[d6];
281 *buffer++ = cDigitsLut[d6 + 1];
282 *buffer++ = cDigitsLut[d7];
283 *buffer++ = cDigitsLut[d7 + 1];
284 *buffer++ = cDigitsLut[d8];
285 *buffer++ = cDigitsLut[d8 + 1];
286 }
287
288 return buffer;
289}
290
291 inline char* i64toa(int64_t value, char* buffer) {
292 uint64_t u = static_cast<uint64_t>(value);
293 if (value < 0) {
294 *buffer++ = '-';
295 u = ~u + 1;
296 }
297
298 return u64toa(u, buffer);
299}
300
301} // namespace internal
302RAPIDJSON_NAMESPACE_END
303
304#endif // RAPIDJSON_ITOA_
rapidjson.h
common definitions and configuration