| 143 | } |
| 144 | |
| 145 | function v1Bytes( |
| 146 | rnds: Uint8Array, |
| 147 | msecs?: number, |
| 148 | nsecs?: number, |
| 149 | clockseq?: number, |
| 150 | node?: Uint8Array, |
| 151 | buf?: Uint8Array, |
| 152 | offset = 0, |
| 153 | ) { |
| 154 | if (rnds.length < 16) { |
| 155 | throw new Error('Random bytes length must be >= 16'); |
| 156 | } |
| 157 | |
| 158 | // Defaults |
| 159 | if (!buf) { |
| 160 | buf = new Uint8Array(16); |
| 161 | offset = 0; |
| 162 | } else { |
| 163 | if (offset < 0 || offset + 16 > buf.length) { |
| 164 | throw new RangeError( |
| 165 | `UUID byte range ${offset}:${offset + 15} is out of buffer bounds`, |
| 166 | ); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | msecs ??= Date.now(); |
| 171 | nsecs ??= 0; |
| 172 | clockseq ??= ((rnds[8] << 8) | rnds[9]) & 0x3fff; |
| 173 | node ??= rnds.slice(10, 16); |
| 174 | |
| 175 | // Offset to Gregorian epoch |
| 176 | // https://www.rfc-editor.org/rfc/rfc9562.html#section-5.1-1 |
| 177 | msecs += 12219292800000; |
| 178 | |
| 179 | // `time_low` |
| 180 | const tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000; |
| 181 | buf[offset++] = (tl >>> 24) & 0xff; |
| 182 | buf[offset++] = (tl >>> 16) & 0xff; |
| 183 | buf[offset++] = (tl >>> 8) & 0xff; |
| 184 | buf[offset++] = tl & 0xff; |
| 185 | |
| 186 | // `time_mid` |
| 187 | const tmh = ((msecs / 0x100000000) * 10000) & 0xfffffff; |
| 188 | buf[offset++] = (tmh >>> 8) & 0xff; |
| 189 | buf[offset++] = tmh & 0xff; |
| 190 | |
| 191 | // `time_high_and_version` |
| 192 | buf[offset++] = ((tmh >>> 24) & 0xf) | 0x10; // include version |
| 193 | buf[offset++] = (tmh >>> 16) & 0xff; |
| 194 | |
| 195 | // `clock_seq_hi_and_reserved` | variant |
| 196 | buf[offset++] = (clockseq >>> 8) | 0x80; |
| 197 | |
| 198 | // `clock_seq_low` |
| 199 | buf[offset++] = clockseq & 0xff; |
| 200 | |
| 201 | // `node` |
| 202 | for (let n = 0; n < 6; ++n) { |