142 lines
4.1 KiB
JavaScript
142 lines
4.1 KiB
JavaScript
// Modified from:
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// https://raw.github.com/kanaka/noVNC/d890e8640f20fba3215ba7be8e0ff145aeb8c17c/include/base64.js
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'use strict';
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// A trick for browserified version.
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// Since we make browserifier to ignore `buffer` module, NodeBuffer will be undefined
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var NodeBuffer = require('buffer').Buffer;
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var Type = require('../type');
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var BASE64_PADDING = '=';
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var BASE64_BINTABLE = [
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, 0, -1, -1,
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
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-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
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];
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var BASE64_CHARTABLE =
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');
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function resolveYamlBinary(data) {
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var code, idx = 0, len = data.length, leftbits;
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leftbits = 0; // number of bits decoded, but yet to be appended
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// Convert one by one.
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for (idx = 0; idx < len; idx += 1) {
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code = data.charCodeAt(idx);
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// Skip LF(NL) || CR
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if (0x0A === code || 0x0D === code) { continue; }
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// Fail on illegal characters
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if (-1 === BASE64_BINTABLE[code & 0x7F]) {
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return false;
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}
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// update bitcount
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leftbits += 6;
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// If we have 8 or more bits, append 8 bits to the result
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if (leftbits >= 8) {
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leftbits -= 8;
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}
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}
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// If there are any bits left, the base64 string was corrupted
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if (leftbits) {
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return false;
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} else {
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return true;
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}
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}
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function constructYamlBinary(data) {
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var value, code, idx = 0, len = data.length, result = [], leftbits, leftdata;
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leftbits = 0; // number of bits decoded, but yet to be appended
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leftdata = 0; // bits decoded, but yet to be appended
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// Convert one by one.
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for (idx = 0; idx < len; idx += 1) {
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code = data.charCodeAt(idx);
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value = BASE64_BINTABLE[code & 0x7F];
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// Skip LF(NL) || CR
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if (0x0A === code || 0x0D === code) { continue; }
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// Collect data into leftdata, update bitcount
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leftdata = (leftdata << 6) | value;
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leftbits += 6;
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// If we have 8 or more bits, append 8 bits to the result
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if (leftbits >= 8) {
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leftbits -= 8;
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// Append if not padding.
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if (BASE64_PADDING !== data.charAt(idx)) {
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result.push((leftdata >> leftbits) & 0xFF);
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}
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leftdata &= (1 << leftbits) - 1;
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}
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}
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// Wrap into Buffer for NodeJS and leave Array for browser
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if (NodeBuffer) {
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return new NodeBuffer(result);
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}
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return result;
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}
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function representYamlBinary(object /*, style*/) {
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var result = '', index, length, rest;
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// Convert every three bytes to 4 ASCII characters.
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for (index = 0, length = object.length - 2; index < length; index += 3) {
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result += BASE64_CHARTABLE[object[index + 0] >> 2];
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result += BASE64_CHARTABLE[((object[index + 0] & 0x03) << 4) + (object[index + 1] >> 4)];
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result += BASE64_CHARTABLE[((object[index + 1] & 0x0F) << 2) + (object[index + 2] >> 6)];
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result += BASE64_CHARTABLE[object[index + 2] & 0x3F];
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}
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rest = object.length % 3;
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// Convert the remaining 1 or 2 bytes, padding out to 4 characters.
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if (0 !== rest) {
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index = object.length - rest;
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result += BASE64_CHARTABLE[object[index + 0] >> 2];
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if (2 === rest) {
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result += BASE64_CHARTABLE[((object[index + 0] & 0x03) << 4) + (object[index + 1] >> 4)];
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result += BASE64_CHARTABLE[(object[index + 1] & 0x0F) << 2];
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result += BASE64_PADDING;
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} else {
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result += BASE64_CHARTABLE[(object[index + 0] & 0x03) << 4];
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result += BASE64_PADDING + BASE64_PADDING;
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}
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}
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return result;
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}
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function isBinary(object) {
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return NodeBuffer && NodeBuffer.isBuffer(object);
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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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