evt/operators/chunksOf.js

Type safe replacement for node's EventEmitter

"use strict";
var __read = (this && this.__read) || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
        if (ar || !(i in from)) {
            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
            ar[i] = from[i];
        }
    }
    return to.concat(ar || Array.prototype.slice.call(from));
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.chunksOf = void 0;
var compose_1 = require("../lib/util/compose");
var concatUint8Array_1 = require("../tools/concatUint8Array");
/** Output Uint8Array of fixed size*/
var chunksOf = function (byteLength) {
    return (0, compose_1.compose)([
        function (chunk_, prev) {
            var _a = __read(prev.rest !== undefined ?
                [(0, concatUint8Array_1.concatUint8Array)([chunk_, prev.rest]), 0, []]
                :
                    [chunk_, prev.currByteLength, prev.chunks], 3), chunk = _a[0], previousByteLength = _a[1], chunks = _a[2];
            var currByteLength = previousByteLength + chunk.byteLength;
            return [
                {
                    currByteLength: currByteLength,
                    "chunks": __spreadArray(__spreadArray([], __read(chunks), false), [chunk], false),
                    "rest": currByteLength >= byteLength ?
                        chunk.slice(byteLength - currByteLength)
                        :
                            undefined
                }
            ];
        },
        {
            "currByteLength": 0,
            "chunks": [],
            "rest": undefined
        }
    ], function (_a) {
        var rest = _a.rest, chunks = _a.chunks;
        return rest !== undefined ?
            [(0, concatUint8Array_1.concatUint8Array)(chunks, byteLength)] :
            null;
    });
};
exports.chunksOf = chunksOf;
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