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'use strict';
/*eslint-disable no-bitwise*/
var NodeBuffer;
try {
// A trick for browserified version, to not include `Buffer` shim
var _require = require;
NodeBuffer = _require('buffer').Buffer;
} catch (__) {}
var Type = require('../type');
// [ 64, 65, 66 ] -> [ padding, CR, LF ]
var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
function resolveYamlBinary(data) {
if (data === null) return false;
var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
// Convert one by one.
for (idx = 0; idx < max; idx++) {
code = map.indexOf(data.charAt(idx));
// Skip CR/LF
if (code > 64) continue;
// Fail on illegal characters
if (code < 0) return false;
bitlen += 6;
}
// If there are any bits left, source was corrupted
return (bitlen % 8) === 0;
}
function constructYamlBinary(data) {
var idx, tailbits,
input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
max = input.length,
map = BASE64_MAP,
bits = 0,
result = [];
// Collect by 6*4 bits (3 bytes)
for (idx = 0; idx < max; idx++) {
if ((idx % 4 === 0) && idx) {
result.push((bits >> 16) & 0xFF);
result.push((bits >> 8) & 0xFF);
result.push(bits & 0xFF);
}
bits = (bits << 6) | map.indexOf(input.charAt(idx));
}
// Dump tail
tailbits = (max % 4) * 6;
if (tailbits === 0) {
result.push((bits >> 16) & 0xFF);
result.push((bits >> 8) & 0xFF);
result.push(bits & 0xFF);
} else if (tailbits === 18) {
result.push((bits >> 10) & 0xFF);
result.push((bits >> 2) & 0xFF);
} else if (tailbits === 12) {
result.push((bits >> 4) & 0xFF);
}
// Wrap into Buffer for NodeJS and leave Array for browser
if (NodeBuffer) {
// Support node 6.+ Buffer API when available
return NodeBuffer.from ? NodeBuffer.from(result) : new NodeBuffer(result);
}
return result;
}
function representYamlBinary(object /*, style*/) {
var result = '', bits = 0, idx, tail,
max = object.length,
map = BASE64_MAP;
// Convert every three bytes to 4 ASCII characters.
for (idx = 0; idx < max; idx++) {
if ((idx % 3 === 0) && idx) {
result += map[(bits >> 18) & 0x3F];
result += map[(bits >> 12) & 0x3F];
result += map[(bits >> 6) & 0x3F];
result += map[bits & 0x3F];
}
bits = (bits << 8) + object[idx];
}
// Dump tail
tail = max % 3;
if (tail === 0) {
result += map[(bits >> 18) & 0x3F];
result += map[(bits >> 12) & 0x3F];
result += map[(bits >> 6) & 0x3F];
result += map[bits & 0x3F];
} else if (tail === 2) {
result += map[(bits >> 10) & 0x3F];
result += map[(bits >> 4) & 0x3F];
result += map[(bits << 2) & 0x3F];
result += map[64];
} else if (tail === 1) {
result += map[(bits >> 2) & 0x3F];
result += map[(bits << 4) & 0x3F];
result += map[64];
result += map[64];
}
return result;
}
function isBinary(object) {
return NodeBuffer && NodeBuffer.isBuffer(object);
}
module.exports = new Type('tag:yaml.org,2002:binary', {
kind: 'scalar',
resolve: resolveYamlBinary,
construct: constructYamlBinary,
predicate: isBinary,
represent: representYamlBinary
});
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