json-joy/esm/json-size/msgpackSizeFast.js

Collection of libraries for building collaborative editing apps.

import { JsonPackExtension, JsonPackValue } from '@jsonjoy.com/json-pack/lib/msgpack';
import { isUint8Array } from '@jsonjoy.com/util/lib/buffers/isUint8Array';
const arraySize = (arr) => {
    let size = 2;
    for (let i = arr.length - 1; i >= 0; i--)
        size += msgpackSizeFast(arr[i]);
    return size;
};
const objectSize = (obj) => {
    let size = 2;
    // biome-ignore lint: object hasOwnProperty check is intentional, Object.hasOwn is too recent
    for (const key in obj)
        if (obj.hasOwnProperty(key))
            size += 2 + key.length + msgpackSizeFast(obj[key]);
    return size;
};
/**
 * Same as `jsonSizeFast`, but for MessagePack.
 *
 * - Allows Buffers or Uint8Arrays a MessagePack `bin` values. Adds 5 bytes overhead for them.
 * - Allows embedded `JsonPackValue` values.
 * - Allows MessagePack `JsonPackExtension` extensions. Adds 6 bytes overhead for them.
 *
 * @param value MessagePack value, which can contain binary data, extensions and embedded MessagePack.
 * @returns Approximate size of the value in bytes.
 */
export const msgpackSizeFast = (value) => {
    if (value === null)
        return 1;
    switch (typeof value) {
        case 'number':
            return 9;
        case 'string':
            return 4 + value.length;
        case 'boolean':
            return 1;
    }
    if (value instanceof Array)
        return arraySize(value);
    if (isUint8Array(value))
        return 5 + value.length;
    if (value instanceof JsonPackValue)
        return value.val.length;
    if (value instanceof JsonPackExtension)
        return 6 + value.val.length;
    return objectSize(value);
};