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name : binary.js
 'use strict';

var Scalar = require('../../nodes/Scalar.js');
var stringifyString = require('../../stringify/stringifyString.js');

const binary = {
    identify: value => value instanceof Uint8Array, // Buffer inherits from Uint8Array
    default: false,
    tag: 'tag:yaml.org,2002:binary',
    /**
     * Returns a Buffer in node and an Uint8Array in browsers
     *
     * To use the resulting buffer as an image, you'll want to do something like:
     *
     *   const blob = new Blob([buffer], { type: 'image/jpeg' })
     *   document.querySelector('#photo').src = URL.createObjectURL(blob)
     */
    resolve(src, onError) {
        if (typeof Buffer === 'function') {
            return Buffer.from(src, 'base64');
        }
        else if (typeof atob === 'function') {
            // On IE 11, atob() can't handle newlines
            const str = atob(src.replace(/[\n\r]/g, ''));
            const buffer = new Uint8Array(str.length);
            for (let i = 0; i < str.length; ++i)
                buffer[i] = str.charCodeAt(i);
            return buffer;
        }
        else {
            onError('This environment does not support reading binary tags; either Buffer or atob is required');
            return src;
        }
    },
    stringify({ comment, type, value }, ctx, onComment, onChompKeep) {
        const buf = value; // checked earlier by binary.identify()
        let str;
        if (typeof Buffer === 'function') {
            str =
                buf instanceof Buffer
                    ? buf.toString('base64')
                    : Buffer.from(buf.buffer).toString('base64');
        }
        else if (typeof btoa === 'function') {
            let s = '';
            for (let i = 0; i < buf.length; ++i)
                s += String.fromCharCode(buf[i]);
            str = btoa(s);
        }
        else {
            throw new Error('This environment does not support writing binary tags; either Buffer or btoa is required');
        }
        if (!type)
            type = Scalar.Scalar.BLOCK_LITERAL;
        if (type !== Scalar.Scalar.QUOTE_DOUBLE) {
            const lineWidth = Math.max(ctx.options.lineWidth - ctx.indent.length, ctx.options.minContentWidth);
            const n = Math.ceil(str.length / lineWidth);
            const lines = new Array(n);
            for (let i = 0, o = 0; i < n; ++i, o += lineWidth) {
                lines[i] = str.substr(o, lineWidth);
            }
            str = lines.join(type === Scalar.Scalar.BLOCK_LITERAL ? '\n' : ' ');
        }
        return stringifyString.stringifyString({ comment, type, value: str }, ctx, onComment, onChompKeep);
    }
};

exports.binary = binary;
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