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Viewing file:     simple.js (2.24 KB)      -rw-r--r--

/**
 * Barebones alternative to {@link BitOutputStream} for word sizes <= 8 and with
 * minimal API surface. The returned object only exposes 2 functions:
 *
 * - `write(x, size)` - writes a single value of given bit size (default: 1 bit)
 * - `bytes()` - retrieve all bytes written so far
 *
 * @remarks
 * The internal backing buffer automatically resizes on demand. The optionally
 * provided `capacity` is only the initial buffer size.
 *
 * @param capacity - initial capacity
 */
export const bitWriter = (capacity = 16) => {
    let buf = new Uint8Array(capacity);
    let pos = 0;
    let bit = 8;
    const ensure = () => {
        if (++pos === buf.length) {
            let b = new Uint8Array(buf.length << 1);
            b.set(buf);
            buf = b;
        }
    };
    return {
        write: (x, n = 1) => {
            x &= (1 << n) - 1;
            let b = bit - n;
            let m = bit < 8 ? ~((1 << bit) - 1) : 0;
            if (b >= 0) {
                m |= (1 << b) - 1;
                buf[pos] = (buf[pos] & m) | ((x << b) & ~m);
                if (b === 0) {
                    ensure();
                    bit = 8;
                }
                else {
                    bit = b;
                }
            }
            else {
                bit = 8 + b;
                buf[pos] = (buf[pos] & m) | ((x >>> -b) & ~m);
                ensure();
                buf[pos] = (buf[pos] & ((1 << bit) - 1)) | ((x << bit) & 0xff);
            }
        },
        bytes: () => buf.slice(0, pos + (bit & 7 ? 1 : 0)),
    };
};
/**
 * Barebones alternative to {@link BitInputStream} for word sizes <= 8 and with
 * minimal API surface and WITHOUT bounds checking of any form! The returned
 * function reads `n` bits from the originally provided buffer.
 *
 * @param buf
 */
export const bitReader = (buf) => {
    let p = 0;
    let b = 8;
    return (n = 1) => {
        let l = b - n;
        let out;
        if (l >= 0) {
            b = l;
            out = (buf[p] >>> l) & ((1 << n) - 1);
            if (!l) {
                p++;
                b = 8;
            }
        }
        else {
            out = (buf[p++] & ((1 << b) - 1)) << -l;
            b = 8 + l;
            out = out | (buf[p] >>> b);
        }
        return out;
    };
};