'use strict';
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/*eslint-disable no-bitwise*/
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var Type = require('../type');
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// [ 64, 65, 66 ] -> [ padding, CR, LF ]
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var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
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function resolveYamlBinary(data) {
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if (data === null) return false;
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var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
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// Convert one by one.
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for (idx = 0; idx < max; idx++) {
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code = map.indexOf(data.charAt(idx));
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// Skip CR/LF
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if (code > 64) continue;
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// Fail on illegal characters
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if (code < 0) return false;
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bitlen += 6;
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}
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// If there are any bits left, source was corrupted
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return (bitlen % 8) === 0;
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}
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function constructYamlBinary(data) {
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var idx, tailbits,
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input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
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max = input.length,
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map = BASE64_MAP,
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bits = 0,
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result = [];
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// Collect by 6*4 bits (3 bytes)
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for (idx = 0; idx < max; idx++) {
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if ((idx % 4 === 0) && idx) {
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result.push((bits >> 16) & 0xFF);
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result.push((bits >> 8) & 0xFF);
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result.push(bits & 0xFF);
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}
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bits = (bits << 6) | map.indexOf(input.charAt(idx));
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}
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// Dump tail
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tailbits = (max % 4) * 6;
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if (tailbits === 0) {
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result.push((bits >> 16) & 0xFF);
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result.push((bits >> 8) & 0xFF);
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result.push(bits & 0xFF);
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} else if (tailbits === 18) {
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result.push((bits >> 10) & 0xFF);
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result.push((bits >> 2) & 0xFF);
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} else if (tailbits === 12) {
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result.push((bits >> 4) & 0xFF);
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}
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return new Uint8Array(result);
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}
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function representYamlBinary(object /*, style*/) {
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var result = '', bits = 0, idx, tail,
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max = object.length,
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map = BASE64_MAP;
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// Convert every three bytes to 4 ASCII characters.
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for (idx = 0; idx < max; idx++) {
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if ((idx % 3 === 0) && idx) {
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result += map[(bits >> 18) & 0x3F];
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result += map[(bits >> 12) & 0x3F];
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result += map[(bits >> 6) & 0x3F];
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result += map[bits & 0x3F];
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}
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bits = (bits << 8) + object[idx];
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}
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// Dump tail
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tail = max % 3;
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if (tail === 0) {
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result += map[(bits >> 18) & 0x3F];
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result += map[(bits >> 12) & 0x3F];
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result += map[(bits >> 6) & 0x3F];
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result += map[bits & 0x3F];
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} else if (tail === 2) {
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result += map[(bits >> 10) & 0x3F];
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result += map[(bits >> 4) & 0x3F];
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result += map[(bits << 2) & 0x3F];
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result += map[64];
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} else if (tail === 1) {
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result += map[(bits >> 2) & 0x3F];
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result += map[(bits << 4) & 0x3F];
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result += map[64];
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result += map[64];
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}
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return result;
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}
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function isBinary(obj) {
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return Object.prototype.toString.call(obj) === '[object Uint8Array]';
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}
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module.exports = new Type('tag:yaml.org,2002:binary', {
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kind: 'scalar',
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resolve: resolveYamlBinary,
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construct: constructYamlBinary,
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predicate: isBinary,
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represent: representYamlBinary
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});
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