basant307/AI_Governance_Project
048
1"use strict";
2
3module.exports = factory(factory);
4
5/**
6 * Reads / writes floats / doubles from / to buffers.
7 * @name util.float
8 * @namespace
9 */
10
11/**
12 * Writes a 32 bit float to a buffer using little endian byte order.
13 * @name util.float.writeFloatLE
14 * @function
15 * @param {number} val Value to write
16 * @param {Uint8Array} buf Target buffer
17 * @param {number} pos Target buffer offset
18 * @returns {undefined}
19 */
20
21/**
22 * Writes a 32 bit float to a buffer using big endian byte order.
23 * @name util.float.writeFloatBE
24 * @function
25 * @param {number} val Value to write
26 * @param {Uint8Array} buf Target buffer
27 * @param {number} pos Target buffer offset
28 * @returns {undefined}
29 */
30
31/**
32 * Reads a 32 bit float from a buffer using little endian byte order.
33 * @name util.float.readFloatLE
34 * @function
35 * @param {Uint8Array} buf Source buffer
36 * @param {number} pos Source buffer offset
37 * @returns {number} Value read
38 */
39
40/**
41 * Reads a 32 bit float from a buffer using big endian byte order.
42 * @name util.float.readFloatBE
43 * @function
44 * @param {Uint8Array} buf Source buffer
45 * @param {number} pos Source buffer offset
46 * @returns {number} Value read
47 */
48
49/**
50 * Writes a 64 bit double to a buffer using little endian byte order.
51 * @name util.float.writeDoubleLE
52 * @function
53 * @param {number} val Value to write
54 * @param {Uint8Array} buf Target buffer
55 * @param {number} pos Target buffer offset
56 * @returns {undefined}
57 */
58
59/**
60 * Writes a 64 bit double to a buffer using big endian byte order.
61 * @name util.float.writeDoubleBE
62 * @function
63 * @param {number} val Value to write
64 * @param {Uint8Array} buf Target buffer
65 * @param {number} pos Target buffer offset
66 * @returns {undefined}
67 */
68
69/**
70 * Reads a 64 bit double from a buffer using little endian byte order.
71 * @name util.float.readDoubleLE
72 * @function
73 * @param {Uint8Array} buf Source buffer
74 * @param {number} pos Source buffer offset
75 * @returns {number} Value read
76 */
77
78/**
79 * Reads a 64 bit double from a buffer using big endian byte order.
80 * @name util.float.readDoubleBE
81 * @function
82 * @param {Uint8Array} buf Source buffer
83 * @param {number} pos Source buffer offset
84 * @returns {number} Value read
85 */
86
87// Factory function for the purpose of node-based testing in modified global environments
88function factory(exports) {
89
90 // float: typed array
91 if (typeof Float32Array !== "undefined") (function() {
92
93 var f32 = new Float32Array([ -0 ]),
94 f8b = new Uint8Array(f32.buffer),
95 le = f8b[3] === 128;
96
97 function writeFloat_f32_cpy(val, buf, pos) {
98 f32[0] = val;
99 buf[pos ] = f8b[0];
100 buf[pos + 1] = f8b[1];
101 buf[pos + 2] = f8b[2];
102 buf[pos + 3] = f8b[3];
103 }
104
105 function writeFloat_f32_rev(val, buf, pos) {
106 f32[0] = val;
107 buf[pos ] = f8b[3];
108 buf[pos + 1] = f8b[2];
109 buf[pos + 2] = f8b[1];
110 buf[pos + 3] = f8b[0];
111 }
112
113 /* istanbul ignore next */
114 exports.writeFloatLE = le ? writeFloat_f32_cpy : writeFloat_f32_rev;
115 /* istanbul ignore next */
116 exports.writeFloatBE = le ? writeFloat_f32_rev : writeFloat_f32_cpy;
117
118 function readFloat_f32_cpy(buf, pos) {
119 f8b[0] = buf[pos ];
120 f8b[1] = buf[pos + 1];
121 f8b[2] = buf[pos + 2];
122 f8b[3] = buf[pos + 3];
123 return f32[0];
124 }
125
126 function readFloat_f32_rev(buf, pos) {
127 f8b[3] = buf[pos ];
128 f8b[2] = buf[pos + 1];
129 f8b[1] = buf[pos + 2];
130 f8b[0] = buf[pos + 3];
131 return f32[0];
132 }
133
134 /* istanbul ignore next */
135 exports.readFloatLE = le ? readFloat_f32_cpy : readFloat_f32_rev;
136 /* istanbul ignore next */
137 exports.readFloatBE = le ? readFloat_f32_rev : readFloat_f32_cpy;
138
139 // float: ieee754
140 })(); else (function() {
141
142 function writeFloat_ieee754(writeUint, val, buf, pos) {
143 var sign = val < 0 ? 1 : 0;
144 if (sign)
145 val = -val;
146 if (val === 0)
147 writeUint(1 / val > 0 ? /* positive */ 0 : /* negative 0 */ 2147483648, buf, pos);
148 else if (isNaN(val))
149 writeUint(2143289344, buf, pos);
150 else if (val > 3.4028234663852886e+38) // +-Infinity
151 writeUint((sign << 31 | 2139095040) >>> 0, buf, pos);
152 else if (val < 1.1754943508222875e-38) // denormal
153 writeUint((sign << 31 | Math.round(val / 1.401298464324817e-45)) >>> 0, buf, pos);
154 else {
155 var exponent = Math.floor(Math.log(val) / Math.LN2),
156 mantissa = Math.round(val * Math.pow(2, -exponent) * 8388608) & 8388607;
157 writeUint((sign << 31 | exponent + 127 << 23 | mantissa) >>> 0, buf, pos);
158 }
159 }
160
161 exports.writeFloatLE = writeFloat_ieee754.bind(null, writeUintLE);
162 exports.writeFloatBE = writeFloat_ieee754.bind(null, writeUintBE);
163
164 function readFloat_ieee754(readUint, buf, pos) {
165 var uint = readUint(buf, pos),
166 sign = (uint >> 31) * 2 + 1,
167 exponent = uint >>> 23 & 255,
168 mantissa = uint & 8388607;
169 return exponent === 255
170 ? mantissa
171 ? NaN
172 : sign * Infinity
173 : exponent === 0 // denormal
174 ? sign * 1.401298464324817e-45 * mantissa
175 : sign * Math.pow(2, exponent - 150) * (mantissa + 8388608);
176 }
177
178 exports.readFloatLE = readFloat_ieee754.bind(null, readUintLE);
179 exports.readFloatBE = readFloat_ieee754.bind(null, readUintBE);
180
181 })();
182
183 // double: typed array
184 if (typeof Float64Array !== "undefined") (function() {
185
186 var f64 = new Float64Array([-0]),
187 f8b = new Uint8Array(f64.buffer),
188 le = f8b[7] === 128;
189
190 function writeDouble_f64_cpy(val, buf, pos) {
191 f64[0] = val;
192 buf[pos ] = f8b[0];
193 buf[pos + 1] = f8b[1];
194 buf[pos + 2] = f8b[2];
195 buf[pos + 3] = f8b[3];
196 buf[pos + 4] = f8b[4];
197 buf[pos + 5] = f8b[5];
198 buf[pos + 6] = f8b[6];
199 buf[pos + 7] = f8b[7];
200 }
201
202 function writeDouble_f64_rev(val, buf, pos) {
203 f64[0] = val;
204 buf[pos ] = f8b[7];
205 buf[pos + 1] = f8b[6];
206 buf[pos + 2] = f8b[5];
207 buf[pos + 3] = f8b[4];
208 buf[pos + 4] = f8b[3];
209 buf[pos + 5] = f8b[2];
210 buf[pos + 6] = f8b[1];
211 buf[pos + 7] = f8b[0];
212 }
213
214 /* istanbul ignore next */
215 exports.writeDoubleLE = le ? writeDouble_f64_cpy : writeDouble_f64_rev;
216 /* istanbul ignore next */
217 exports.writeDoubleBE = le ? writeDouble_f64_rev : writeDouble_f64_cpy;
218
219 function readDouble_f64_cpy(buf, pos) {
220 f8b[0] = buf[pos ];
221 f8b[1] = buf[pos + 1];
222 f8b[2] = buf[pos + 2];
223 f8b[3] = buf[pos + 3];
224 f8b[4] = buf[pos + 4];
225 f8b[5] = buf[pos + 5];
226 f8b[6] = buf[pos + 6];
227 f8b[7] = buf[pos + 7];
228 return f64[0];
229 }
230
231 function readDouble_f64_rev(buf, pos) {
232 f8b[7] = buf[pos ];
233 f8b[6] = buf[pos + 1];
234 f8b[5] = buf[pos + 2];
235 f8b[4] = buf[pos + 3];
236 f8b[3] = buf[pos + 4];
237 f8b[2] = buf[pos + 5];
238 f8b[1] = buf[pos + 6];
239 f8b[0] = buf[pos + 7];
240 return f64[0];
241 }
242
243 /* istanbul ignore next */
244 exports.readDoubleLE = le ? readDouble_f64_cpy : readDouble_f64_rev;
245 /* istanbul ignore next */
246 exports.readDoubleBE = le ? readDouble_f64_rev : readDouble_f64_cpy;
247
248 // double: ieee754
249 })(); else (function() {
250
251 function writeDouble_ieee754(writeUint, off0, off1, val, buf, pos) {
252 var sign = val < 0 ? 1 : 0;
253 if (sign)
254 val = -val;
255 if (val === 0) {
256 writeUint(0, buf, pos + off0);
257 writeUint(1 / val > 0 ? /* positive */ 0 : /* negative 0 */ 2147483648, buf, pos + off1);
258 } else if (isNaN(val)) {
259 writeUint(0, buf, pos + off0);
260 writeUint(2146959360, buf, pos + off1);
261 } else if (val > 1.7976931348623157e+308) { // +-Infinity
262 writeUint(0, buf, pos + off0);
263 writeUint((sign << 31 | 2146435072) >>> 0, buf, pos + off1);
264 } else {
265 var mantissa;
266 if (val < 2.2250738585072014e-308) { // denormal
267 mantissa = val / 5e-324;
268 writeUint(mantissa >>> 0, buf, pos + off0);
269 writeUint((sign << 31 | mantissa / 4294967296) >>> 0, buf, pos + off1);
270 } else {
271 var exponent = Math.floor(Math.log(val) / Math.LN2);
272 if (exponent === 1024)
273 exponent = 1023;
274 mantissa = val * Math.pow(2, -exponent);
275 writeUint(mantissa * 4503599627370496 >>> 0, buf, pos + off0);
276 writeUint((sign << 31 | exponent + 1023 << 20 | mantissa * 1048576 & 1048575) >>> 0, buf, pos + off1);
277 }
278 }
279 }
280
281 exports.writeDoubleLE = writeDouble_ieee754.bind(null, writeUintLE, 0, 4);
282 exports.writeDoubleBE = writeDouble_ieee754.bind(null, writeUintBE, 4, 0);
283
284 function readDouble_ieee754(readUint, off0, off1, buf, pos) {
285 var lo = readUint(buf, pos + off0),
286 hi = readUint(buf, pos + off1);
287 var sign = (hi >> 31) * 2 + 1,
288 exponent = hi >>> 20 & 2047,
289 mantissa = 4294967296 * (hi & 1048575) + lo;
290 return exponent === 2047
291 ? mantissa
292 ? NaN
293 : sign * Infinity
294 : exponent === 0 // denormal
295 ? sign * 5e-324 * mantissa
296 : sign * Math.pow(2, exponent - 1075) * (mantissa + 4503599627370496);
297 }
298
299 exports.readDoubleLE = readDouble_ieee754.bind(null, readUintLE, 0, 4);
300 exports.readDoubleBE = readDouble_ieee754.bind(null, readUintBE, 4, 0);
301
302 })();
303
304 return exports;
305}
306
307// uint helpers
308
309function writeUintLE(val, buf, pos) {
310 buf[pos ] = val & 255;
311 buf[pos + 1] = val >>> 8 & 255;
312 buf[pos + 2] = val >>> 16 & 255;
313 buf[pos + 3] = val >>> 24;
314}
315
316function writeUintBE(val, buf, pos) {
317 buf[pos ] = val >>> 24;
318 buf[pos + 1] = val >>> 16 & 255;
319 buf[pos + 2] = val >>> 8 & 255;
320 buf[pos + 3] = val & 255;
321}
322
323function readUintLE(buf, pos) {
324 return (buf[pos ]
325 | buf[pos + 1] << 8
326 | buf[pos + 2] << 16
327 | buf[pos + 3] << 24) >>> 0;
328}
329
330function readUintBE(buf, pos) {
331 return (buf[pos ] << 24
332 | buf[pos + 1] << 16
333 | buf[pos + 2] << 8
334 | buf[pos + 3]) >>> 0;
335}
336