[Kimchi-devel] [PATCH] add a Base64 saftURL encode and decode function

[shaohef at linux.vnet.ibm.com]

From: ShaoHe Feng <shaohef at linux.vnet.ibm.com>

These two functions are similar to the functions in
ui/js/novnc/base64.js

usage:
--- a/ui/pages/login.html.tmpl
+++ b/ui/pages/login.html.tmpl
@@ -36,6 +36,7 @@
 <script src="$href('libs/jquery-ui.min.js')"></script>
 <script src="$href('libs/jquery-ui-i18n.min.js')"></script>
 <script src="$href('js/kimchi.min.js')"></script>
+<script src="$href('js/Base64saftURL.js')"></script>
 <style type="text/css">
 .topbar select {
     float: right;

then in UI:
Base64.encode("f4>&^bc")
"ZjQ-Jl5iYw=="
Base64.decode("ZjQ-Jl5iYw==")
"f4>&^bc"

this is just a sample.

we can add it to ui/js/src/kimchi.utils.js

Signed-off-by: ShaoHe Feng <shaohef at linux.vnet.ibm.com>
---
 ui/js/Base64saftURL.js | 110 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 ui/js/Base64saftURL.js

diff --git a/ui/js/Base64saftURL.js b/ui/js/Base64saftURL.js
new file mode 100644
index 0000000..8880a7e
--- /dev/null
+++ b/ui/js/Base64saftURL.js
@@ -0,0 +1,110 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js
+
+/*jslint white: false, bitwise: false, plusplus: false */
+/*global console */
+
+var Base64 = {
+
+/* Convert data (an array of integers) to a Base64 string. */
+toBase64Table : 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_='.split(''),
+base64Pad     : '=',
+
+encode: function (data) {
+    "use strict";
+    var result = '';
+    var toBase64Table = Base64.toBase64Table;
+    var length = data.length
+    var lengthpad = (length%3);
+    var i = 0, j = 0;
+    // Convert every three bytes to 4 ascii characters.
+  /* BEGIN LOOP */
+    for (i = 0; i < (length - 2); i += 3) {
+        result += toBase64Table[data.charCodeAt(i) >> 2];
+        result += toBase64Table[((data.charCodeAt(i) & 0x03) << 4) + (data.charCodeAt(i+1) >> 4)];
+        result += toBase64Table[((data.charCodeAt(i+1) & 0x0f) << 2) + (data.charCodeAt(i+2) >> 6)];
+        result += toBase64Table[data.charCodeAt(i+2) & 0x3f];
+    }
+  /* END LOOP */
+
+    // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
+    if (lengthpad === 2) {
+        j = length - lengthpad;
+        result += toBase64Table[data.charCodeAt(j) >> 2];
+        result += toBase64Table[((data.charCodeAt(j) & 0x03) << 4) + (data.charCodeAt(j+1) >> 4)];
+        result += toBase64Table[(data.charCodeAt(j+1) & 0x0f) << 2];
+        result += toBase64Table[64];
+    } else if (lengthpad === 1) {
+        j = length - lengthpad;
+        result += toBase64Table[data.charCodeAt(j) >> 2];
+        result += toBase64Table[(data.charCodeAt(j) & 0x03) << 4];
+        result += toBase64Table[64];
+        result += toBase64Table[64];
+    }
+
+    return result;
+},
+
+/* Convert Base64 data to a string */
+toBinaryTable : [
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,62,-1,-1,
+    52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
+    -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
+    15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,63,
+    -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+    41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+],
+
+decode: function (data, offset) {
+    "use strict";
+    offset = typeof(offset) !== 'undefined' ? offset : 0;
+    var toBinaryTable = Base64.toBinaryTable;
+    var base64Pad = Base64.base64Pad;
+    var result, result_length, idx, i, c, padding;
+    var leftbits = 0; // number of bits decoded, but yet to be appended
+    var leftdata = 0; // bits decoded, but yet to be appended
+
+    // Convert one by one.
+  /* BEGIN LOOP */
+    result = ""
+    for (idx = 0, i = offset; i < data.length; i++) {
+        c = toBinaryTable[data.charCodeAt(i) & 0x7f];
+        padding = (data.charAt(i) === base64Pad);
+        // Skip illegal characters and whitespace
+        if (c === -1) {
+            console.error("Illegal character code " + data.charCodeAt(i) + " at position " + i);
+            continue;
+        }
+
+        // Collect data into leftdata, update bitcount
+        leftdata = (leftdata << 6) | c;
+        leftbits += 6;
+
+        // If we have 8 or more bits, append 8 bits to the result
+        if (leftbits >= 8) {
+            leftbits -= 8;
+            // Append if not padding.
+            if (!padding) {
+                idx++;
+                result += String.fromCharCode((leftdata >> leftbits) & 0xff);
+            }
+            leftdata &= (1 << leftbits) - 1;
+        }
+    }
+  /* END LOOP */
+
+    // If there are any bits left, the base64 string was corrupted
+    if (leftbits) {
+        throw {name: 'Base64-Error',
+               message: 'Corrupted base64 string'};
+    }
+
+    return result;
+}
+
+}; /* End of Base64 namespace */
-- 
1.9.3