60 lines
1.8 KiB
60 lines
1.8 KiB
12 years ago
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// convert to/from various values
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var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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// Convert a byte array to a hex string
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module.exports.bytesToHex = function(bytes) {
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for (var hex = [], i = 0; i < bytes.length; i++) {
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hex.push((bytes[i] >>> 4).toString(16));
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hex.push((bytes[i] & 0xF).toString(16));
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}
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return hex.join("");
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};
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// Convert a hex string to a byte array
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module.exports.hexToBytes = function(hex) {
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for (var bytes = [], c = 0; c < hex.length; c += 2)
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bytes.push(parseInt(hex.substr(c, 2), 16));
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return bytes;
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}
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// Convert a byte array to a base-64 string
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module.exports.bytesToBase64 = function(bytes) {
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// Use browser-native function if it exists
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if (typeof btoa == "function") return btoa(Binary.bytesToString(bytes));
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for(var base64 = [], i = 0; i < bytes.length; i += 3) {
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var triplet = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
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for (var j = 0; j < 4; j++) {
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if (i * 8 + j * 6 <= bytes.length * 8)
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base64.push(base64map.charAt((triplet >>> 6 * (3 - j)) & 0x3F));
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else base64.push("=");
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}
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}
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return base64.join("");
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}
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// Convert a base-64 string to a byte array
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module.exports.base64ToBytes = function(base64) {
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// Use browser-native function if it exists
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if (typeof atob == "function") return Binary.stringToBytes(atob(base64));
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// Remove non-base-64 characters
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base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");
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for (var bytes = [], i = 0, imod4 = 0; i < base64.length; imod4 = ++i % 4) {
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if (imod4 == 0) continue;
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bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2)) |
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(base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
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}
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return bytes;
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}
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// utf8 and binary?
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//stringToBytes
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//bytesToString
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