"use strict";
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function pushBits(arr, n, value) {
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for (var bit = 1 << (n - 1); bit; bit = bit >>> 1) {
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arr.push(bit & value ? 1 : 0);
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}
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}
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// {{{1 8bit encode
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function encode_8bit(data) {
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var len = data.length;
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var bits = [];
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for (var i = 0; i < len; i++) {
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pushBits(bits, 8, data[i]);
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}
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var res = {};
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var d = [0, 1, 0, 0];
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pushBits(d, 16, len);
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res.data10 = res.data27 = d.concat(bits);
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if (len < 256) {
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var d = [0, 1, 0, 0];
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pushBits(d, 8, len);
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res.data1 = d.concat(bits);
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}
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return res;
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}
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// {{{1 alphanumeric encode
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var ALPHANUM = (function(s) {
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var res = {};
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for (var i = 0; i < s.length; i++) {
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res[s[i]] = i;
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}
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return res;
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})('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:');
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function encode_alphanum(str) {
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var len = str.length;
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var bits = [];
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for (var i = 0; i < len; i += 2) {
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var b = 6;
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var n = ALPHANUM[str[i]];
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if (str[i+1]) {
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b = 11;
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n = n * 45 + ALPHANUM[str[i+1]];
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}
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pushBits(bits, b, n);
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}
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var res = {};
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var d = [0, 0, 1, 0];
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pushBits(d, 13, len);
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res.data27 = d.concat(bits);
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if (len < 2048) {
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var d = [0, 0, 1, 0];
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pushBits(d, 11, len);
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res.data10 = d.concat(bits);
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}
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if (len < 512) {
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var d = [0, 0, 1, 0];
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pushBits(d, 9, len);
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res.data1 = d.concat(bits);
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}
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return res;
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}
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// {{{1 numeric encode
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function encode_numeric(str) {
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var len = str.length;
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var bits = [];
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for (var i = 0; i < len; i += 3) {
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var s = str.substr(i, 3);
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var b = Math.ceil(s.length * 10 / 3);
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pushBits(bits, b, parseInt(s, 10));
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}
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var res = {};
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var d = [0, 0, 0, 1];
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pushBits(d, 14, len);
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res.data27 = d.concat(bits);
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if (len < 4096) {
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var d = [0, 0, 0, 1];
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pushBits(d, 12, len);
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res.data10 = d.concat(bits);
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}
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if (len < 1024) {
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var d = [0, 0, 0, 1];
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pushBits(d, 10, len);
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res.data1 = d.concat(bits);
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}
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return res;
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}
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// {{{1 url encode
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function encode_url(str) {
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var slash = str.indexOf('/', 8) + 1 || str.length;
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var res = encode(str.slice(0, slash).toUpperCase(), false);
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if (slash >= str.length) {
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return res;
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}
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var path_res = encode(str.slice(slash), false);
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res.data27 = res.data27.concat(path_res.data27);
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if (res.data10 && path_res.data10) {
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res.data10 = res.data10.concat(path_res.data10);
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}
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if (res.data1 && path_res.data1) {
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res.data1 = res.data1.concat(path_res.data1);
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}
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return res;
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}
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// {{{1 Choose encode mode and generates struct with data for different version
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function encode(data, parse_url) {
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var str;
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var t = typeof data;
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if (t == 'string' || t == 'number') {
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str = '' + data;
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data = new Buffer(str);
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} else if (Buffer.isBuffer(data)) {
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str = data.toString();
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} else if (Array.isArray(data)) {
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data = new Buffer(data);
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str = data.toString();
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} else {
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throw new Error("Bad data");
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}
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if (/^[0-9]+$/.test(str)) {
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if (data.length > 7089) {
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throw new Error("Too much data");
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}
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return encode_numeric(str);
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}
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if (/^[0-9A-Z \$%\*\+\.\/\:\-]+$/.test(str)) {
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if (data.length > 4296) {
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throw new Error("Too much data");
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}
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return encode_alphanum(str);
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}
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if (parse_url && /^https?:/i.test(str)) {
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return encode_url(str);
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}
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if (data.length > 2953) {
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throw new Error("Too much data");
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}
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return encode_8bit(data);
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}
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// {{{1 export functions
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module.exports = encode;
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