univ-conv/commonjs/converters/ArrayBufferConverter.js

The universal binary and text converter

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ArrayBufferConverter = void 0;
const base64_arraybuffer_1 = require("base64-arraybuffer");
const AbstractConverter_1 = require("./AbstractConverter");
const core_1 = require("./core");
const Environment_1 = require("./Environment");
const StringUtil_1 = require("./StringUtil");
const hasSharedArrayBuffer = typeof SharedArrayBuffer === "function";
class ArrayBufferConverter extends AbstractConverter_1.AbstractConverter {
    constructor() {
        super(...arguments);
        this.type = "arraybuffer";
    }
    empty() {
        return core_1.EMPTY_ARRAY_BUFFER;
    }
    is(input) {
        return (input instanceof ArrayBuffer ||
            (hasSharedArrayBuffer && input instanceof SharedArrayBuffer));
    }
    async _from(input, options) {
        const converter = (0, AbstractConverter_1._)()._find(input, options);
        return await converter.toArrayBuffer(input, options);
    }
    _getStartEnd(input, options) {
        return Promise.resolve((0, core_1.getStartEnd)(options, input.byteLength));
    }
    _isEmpty(input) {
        return input.byteLength === 0;
    }
    _merge(chunks) {
        const byteLength = chunks.reduce((sum, chunk) => {
            return sum + chunk.byteLength;
        }, 0);
        const u8 = (0, Environment_1.newBuffer)(byteLength);
        let pos = 0;
        for (const chunk of chunks) {
            u8.set((0, Environment_1.newBufferFrom)(chunk), pos);
            pos += chunk.byteLength;
        }
        return Promise.resolve(u8.buffer);
    }
    _size(input) {
        return Promise.resolve(input.byteLength);
    }
    async _toArrayBuffer(input, options) {
        if ((0, core_1.hasNoStartLength)(options)) {
            return input;
        }
        const { start, end } = await this._getStartEnd(input, options);
        return input.slice(start, end);
    }
    async _toBase64(input, options) {
        const u8 = await this._toUint8Array(input, options);
        return (0, base64_arraybuffer_1.encode)(u8);
    }
    async _toText(input, options) {
        const u8 = await this._toUint8Array(input, options);
        const textHelper = await (0, StringUtil_1.getTextHelper)();
        return await textHelper.bufferToText(u8, options);
    }
    async _toUint8Array(input, options) {
        const ab = await this._toArrayBuffer(input, options);
        return Environment_1.hasBuffer ? Buffer.from(ab) : new Uint8Array(ab);
    }
}
exports.ArrayBufferConverter = ArrayBufferConverter;
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