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Viewing file:     v7.js (2.08 KB)      -rw-r--r--

import rng from './rng.js';
import { unsafeStringify } from './stringify.js';
const _state = {};
function v7(options, buf, offset) {
    let bytes;
    if (options) {
        bytes = v7Bytes(options.random ?? options.rng?.() ?? rng(), options.msecs, options.seq, buf, offset);
    }
    else {
        const now = Date.now();
        const rnds = rng();
        updateV7State(_state, now, rnds);
        bytes = v7Bytes(rnds, _state.msecs, _state.seq, buf, offset);
    }
    return buf ?? unsafeStringify(bytes);
}
export function updateV7State(state, now, rnds) {
    state.msecs ??= -Infinity;
    state.seq ??= 0;
    if (now > state.msecs) {
        state.seq = (rnds[6] << 23) | (rnds[7] << 16) | (rnds[8] << 8) | rnds[9];
        state.msecs = now;
    }
    else {
        state.seq = (state.seq + 1) | 0;
        if (state.seq === 0) {
            state.msecs++;
        }
    }
    return state;
}
function v7Bytes(rnds, msecs, seq, buf, offset = 0) {
    if (rnds.length < 16) {
        throw new Error('Random bytes length must be >= 16');
    }
    if (!buf) {
        buf = new Uint8Array(16);
        offset = 0;
    }
    else {
        if (offset < 0 || offset + 16 > buf.length) {
            throw new RangeError(`UUID byte range ${offset}:${offset + 15} is out of buffer bounds`);
        }
    }
    msecs ??= Date.now();
    seq ??= ((rnds[6] * 0x7f) << 24) | (rnds[7] << 16) | (rnds[8] << 8) | rnds[9];
    buf[offset++] = (msecs / 0x10000000000) & 0xff;
    buf[offset++] = (msecs / 0x100000000) & 0xff;
    buf[offset++] = (msecs / 0x1000000) & 0xff;
    buf[offset++] = (msecs / 0x10000) & 0xff;
    buf[offset++] = (msecs / 0x100) & 0xff;
    buf[offset++] = msecs & 0xff;
    buf[offset++] = 0x70 | ((seq >>> 28) & 0x0f);
    buf[offset++] = (seq >>> 20) & 0xff;
    buf[offset++] = 0x80 | ((seq >>> 14) & 0x3f);
    buf[offset++] = (seq >>> 6) & 0xff;
    buf[offset++] = ((seq << 2) & 0xff) | (rnds[10] & 0x03);
    buf[offset++] = rnds[11];
    buf[offset++] = rnds[12];
    buf[offset++] = rnds[13];
    buf[offset++] = rnds[14];
    buf[offset++] = rnds[15];
    return buf;
}
export default v7;