univ-conv/lib/converters/Uint8ArrayConverter.js

The universal binary and text converter

import { encode } from "base64-arraybuffer";
import { AbstractConverter, _ } from "./AbstractConverter";
import { EMPTY_UINT8_ARRAY, getStartEnd, hasNoStartLength, } from "./core";
import { hasBuffer, isBuffer, newBuffer, newBufferFrom } from "./Environment";
import { getTextHelper } from "./StringUtil";
export class Uint8ArrayConverter extends AbstractConverter {
    constructor() {
        super(...arguments);
        this.type = "uint8array";
    }
    empty() {
        return EMPTY_UINT8_ARRAY;
    }
    is(input) {
        return input instanceof Uint8Array || isBuffer(input);
    }
    async _from(input, options) {
        if (hasBuffer && typeof input === "string") {
            const type = options.inputStringType;
            let buffer;
            if (type === "base64") {
                buffer = Buffer.from(input, "base64");
            }
            else if (type === "binary") {
                buffer = Buffer.from(input, "binary");
            }
            else if (type === "hex") {
                buffer = Buffer.from(input, "hex");
            }
            else if (type === "text") {
                const textHelper = await getTextHelper();
                const u8 = await textHelper.textToBuffer(input, options);
                buffer = u8;
            }
            if (buffer) {
                const { start, end } = await this._getStartEnd(buffer, options);
                return buffer.subarray(start, end);
            }
        }
        const ab = await _().convert("arraybuffer", input, options);
        return newBufferFrom(ab);
    }
    _getStartEnd(input, options) {
        return Promise.resolve(getStartEnd(options, input.byteLength));
    }
    _isEmpty(input) {
        return input.byteLength === 0;
    }
    _merge(chunks) {
        if (hasBuffer) {
            return Promise.resolve(Buffer.concat(chunks));
        }
        const byteLength = chunks.reduce((sum, chunk) => {
            return sum + chunk.byteLength;
        }, 0);
        const u8 = newBuffer(byteLength);
        let pos = 0;
        for (const chunk of chunks) {
            u8.set(chunk, pos);
            pos += chunk.byteLength;
        }
        return Promise.resolve(u8);
    }
    _size(input) {
        return Promise.resolve(input.byteLength);
    }
    async _toArrayBuffer(input, options) {
        const u8 = await this._toUint8Array(input, options);
        return u8.buffer.slice(u8.byteOffset, u8.byteOffset + u8.byteLength);
    }
    async _toBase64(input, options) {
        const u8 = await this._toUint8Array(input, options);
        return encode(u8);
    }
    async _toText(input, options) {
        const u8 = await this._toUint8Array(input, options);
        const textHelper = await getTextHelper();
        return await textHelper.bufferToText(u8, options);
    }
    async _toUint8Array(input, options) {
        if (hasNoStartLength(options)) {
            return input;
        }
        const { start, end } = await this._getStartEnd(input, options);
        return input.subarray(start, end);
    }
}
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