@hqtsm/dataview/script/int/24.js

DataView utilities

"use strict";
/**
 * @module
 *
 * 24-bit integer operations.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.getInt24 = getInt24;
exports.getUint24 = getUint24;
exports.setInt24 = setInt24;
exports.setUint24 = setUint24;
/**
 * Get 24-bit signed integer.
 *
 * @param dataView Data view.
 * @param byteOffset Byte offset.
 * @param littleEndian Little endian.
 * @returns Integer value.
 */
function getInt24(dataView, byteOffset, littleEndian = false) {
    return getUint24(dataView, byteOffset, littleEndian) << 8 >> 8;
}
/**
 * Get 24-bit unsigned integer.
 *
 * @param dataView Data view.
 * @param byteOffset Byte offset.
 * @param littleEndian Little endian.
 * @returns Integer value.
 */
function getUint24(dataView, byteOffset, littleEndian = false) {
    const b = dataView.getUint8((byteOffset |= 0) + 2);
    const a = dataView.getUint16(byteOffset, littleEndian);
    return littleEndian ? a | b << 16 : a << 8 | b;
}
/**
 * Set 24-bit signed integer.
 *
 * @param dataView Data view.
 * @param byteOffset Byte offset.
 * @param value Integer value.
 * @param littleEndian Little endian.
 */
function setInt24(dataView, byteOffset, value, littleEndian = false) {
    setUint24(dataView, byteOffset, value, littleEndian);
}
/**
 * Set 24-bit unsigned integer.
 *
 * @param dataView Data view.
 * @param byteOffset Byte offset.
 * @param value Integer value.
 * @param littleEndian Little endian.
 */
function setUint24(dataView, byteOffset, value, littleEndian = false) {
    let a, b = value & 65280;
    if (littleEndian) {
        b |= value >> 16 & 255;
        a = value & 255;
    }
    else {
        b |= value & 255;
        a = value >> 16 & 255;
    }
    if ((byteOffset |= 0) < 0) {
        // Trigger native OOB exception.
        dataView.setUint8(byteOffset, a);
    }
    dataView.setUint16(byteOffset + 1, b);
    dataView.setUint8(byteOffset, a);
}
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