-
Notifications
You must be signed in to change notification settings - Fork 0
/
num.c
452 lines (433 loc) · 11.3 KB
/
num.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
// src/aksl/num.c 2017-10-25 Alan U. Kennington.
/*-----------------------------------------------------------------------------
Copyright (C) 1989-2018, Alan U. Kennington.
You may distribute this software under the terms of Alan U. Kennington's
modified Artistic Licence, as specified in the accompanying LICENCE file.
-----------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
Functions in this file:
num::
encoding_length
encode
decode
print
operator uint8
operator uint16
operator uint32
operator int8
operator int16
operator int32
operator double
------------------------------------------------------------------------------*/
// AKSL header files:
#include "aksl/num.h"
//----------------------//
// num::encoding_length //
//----------------------//
int num::encoding_length() {
// 1 bytes for the number-type.
int n_bytes = 1;
// Add the bytes for the number itself.
switch (typ) {
case ntNULL:
// Nothing to do.
break;
case ntUI8:
n_bytes += 1;
break;
case ntUI16:
n_bytes += 2;
break;
case ntUI32:
n_bytes += 4;
break;
case ntI8:
n_bytes += 1;
break;
case ntI16:
n_bytes += 2;
break;
case ntI32:
n_bytes += 4;
break;
case ntD:
n_bytes += sizeof(double);
break;
default:
return 0;
} // End of switch (typ).
return n_bytes;
} // End of function num::encoding_length.
/*------------------------------------------------------------------------------
The return value is the number of bytes written.
If the return value is 0, then an error has occurred.
------------------------------------------------------------------------------*/
//----------------------//
// num::encode //
//----------------------//
int num::encode(char* buf, int buflen) {
if (!buf || buflen < 1)
return 0;
int n_bytes = 1;
switch (typ) {
case ntNULL:
// No value to encode.
break;
case ntUI8:
if (buflen < 2)
return 0;
buf[1] = (char)ui8;
n_bytes += 1;
break;
case ntUI16:
if (buflen < 3)
return 0;
u16encode(buf + 1, ui16);
n_bytes += 2;
break;
case ntUI32:
if (buflen < 5)
return 0;
u32encode(buf + 1, ui32);
n_bytes += 4;
break;
case ntI8:
if (buflen < 2)
return 0;
buf[1] = (char)i8;
n_bytes += 1;
break;
case ntI16:
if (buflen < 3)
return 0;
u16encode(buf + 1, (uint16)i16);
n_bytes += 2;
break;
case ntI32:
if (buflen < 5)
return 0;
u32encode(buf + 1, (uint32)i32);
n_bytes += 4;
break;
case ntD:
if (buflen < 1 + sizeof(double))
return 0;
dbl_encode(buf + 1, d);
n_bytes += sizeof(double);
break;
default:
return 0;
} // End of switch (typ).
// Write the number type to the first byte.
*buf = (char)typ;
return n_bytes;
} // End of function num::encode.
/*------------------------------------------------------------------------------
The return value is the number of bytes successfully decoded.
------------------------------------------------------------------------------*/
//----------------------//
// num::decode //
//----------------------//
int num::decode(const char* buf, int buflen) {
if (!buf || buflen < 1) {
typ = ntNULL;
return 0;
}
int n_bytes = 1;
switch (num_t(buf[0])) {
case ntNULL:
// Nothing to do.
break;
case ntUI8:
if (buflen < 2) {
typ = ntNULL;
return 0;
}
ui8 = (uint8)buf[1];
n_bytes += 1;
break;
case ntUI16:
if (buflen < 3) {
typ = ntNULL;
return 0;
}
ui16 = u16decode(buf + 1);
n_bytes += 2;
break;
case ntUI32:
if (buflen < 5) {
typ = ntNULL;
return 0;
}
ui32 = u32decode(buf + 1);
n_bytes += 4;
break;
case ntI8:
if (buflen < 2) {
typ = ntNULL;
return 0;
}
i8 = (int8)buf[1];
n_bytes += 1;
break;
case ntI16:
if (buflen < 3) {
typ = ntNULL;
return 0;
}
i16 = i16decode(buf + 1);
n_bytes += 2;
break;
case ntI32:
if (buflen < 5) {
typ = ntNULL;
return 0;
}
i32 = i32decode(buf + 1);
n_bytes += 4;
break;
case ntD:
if (buflen < 1 + sizeof(double)) {
typ = ntNULL;
return 0;
}
d = dbl_decode(buf + 1);
n_bytes += sizeof(double);
break;
default:
return 0;
} // End of switch (typ).
// If (and only if) successful, copy the number-type.
typ = num_t(buf[0]);
return n_bytes;
} // End of function num::decode.
//----------------------//
// num::print //
//----------------------//
void num::print(ostream& os) {
switch (typ) {
case ntUI8:
os << "uint8: " << (unsigned long)ui8;
break;
case ntUI16:
os << "uint16: " << (unsigned long)ui16;
break;
case ntUI32:
os << "uint32: " << (unsigned long)ui32;
break;
case ntI8:
os << "int8: " << (long)i8;
break;
case ntI16:
os << "int16: " << (long)i16;
break;
case ntI32:
os << "int32: " << (long)i32;
break;
case ntD:
os << "double: " << d;
break;
case ntNULL:
os << "[null]";
break;
default:
os << "[undefined]";
break;
}
} // End of function num::print.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator uint8 //
//----------------------//
num::operator uint8() const {
switch(typ) {
case ntUI8:
return (uint8)ui8;
case ntUI16:
return (uint8)ui16;
case ntUI32:
return (uint8)ui32;
case ntI8:
return (uint8)i8;
case ntI16:
return (uint8)i16;
case ntI32:
return (uint8)i32;
case ntD:
return (uint8)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator uint8.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator uint16 //
//----------------------//
num::operator uint16() const {
switch(typ) {
case ntUI8:
return (uint16)ui8;
case ntUI16:
return (uint16)ui16;
case ntUI32:
return (uint16)ui32;
case ntI8:
return (uint16)i8;
case ntI16:
return (uint16)i16;
case ntI32:
return (uint16)i32;
case ntD:
return (uint16)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator uint16.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator uint32 //
//----------------------//
num::operator uint32() const {
switch(typ) {
case ntUI8:
return (uint32)ui8;
case ntUI16:
return (uint32)ui16;
case ntUI32:
return (uint32)ui32;
case ntI8:
return (uint32)i8;
case ntI16:
return (uint32)i16;
case ntI32:
return (uint32)i32;
case ntD:
return (uint32)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator uint32.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator int8 //
//----------------------//
num::operator int8() const {
switch(typ) {
case ntUI8:
return (int8)ui8;
case ntUI16:
return (int8)ui16;
case ntUI32:
return (int8)ui32;
case ntI8:
return (int8)i8;
case ntI16:
return (int8)i16;
case ntI32:
return (int8)i32;
case ntD:
return (int8)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator int8.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator int16 //
//----------------------//
num::operator int16() const {
switch(typ) {
case ntUI8:
return (int16)ui8;
case ntUI16:
return (int16)ui16;
case ntUI32:
return (int16)ui32;
case ntI8:
return (int16)i8;
case ntI16:
return (int16)i16;
case ntI32:
return (int16)i32;
case ntD:
return (int16)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator int16.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator int32 //
//----------------------//
num::operator int32() const {
switch(typ) {
case ntUI8:
return (int32)ui8;
case ntUI16:
return (int32)ui16;
case ntUI32:
return (int32)ui32;
case ntI8:
return (int32)i8;
case ntI16:
return (int32)i16;
case ntI32:
return (int32)i32;
case ntD:
return (int32)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator int32.
/*------------------------------------------------------------------------------
This function makes no serious attempt to convert out-of-range numbers into
range.
------------------------------------------------------------------------------*/
//----------------------//
// num::operator double //
//----------------------//
num::operator double() const {
switch(typ) {
case ntUI8:
return (double)ui8;
case ntUI16:
return (double)ui16;
case ntUI32:
return (double)ui32;
case ntI8:
return (double)i8;
case ntI16:
return (double)i16;
case ntI32:
return (double)i32;
case ntD:
return (double)d;
default:
case ntNULL:
return 0;
}
} // End of function num::operator double.