ansilove.js

commit 30ce95493f8bcd9c01f9d3bd642ecd58b25a074f
parent f690331635609593f3684bfa0d5f1c57dba6e441
Author: Andy Herbert <andy.herbert@gmail.com>
Date:   Sat,  2 Nov 2013 10:41:30 +0000

Removed non-standard atob() call with custom routine.

Diffstat:
M
ansilove.js
 | 
26
++++++++++++++++++++------
M
jslint.json
 | 
2
+-

2 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/ansilove.js b/ansilove.js
@@ -123,7 +123,7 @@ var AnsiLove = (function () {
     }
 
     Font = (function () {
-        var FONT_PRESETS, fontBitsBuffer;
+        var FONT_PRESETS, BASE64_CHARS, fontBitsBuffer;
 
         FONT_PRESETS = {
             "b-strict": {
@@ -302,6 +302,8 @@ var AnsiLove = (function () {
             }
         };
 
+        BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
         fontBitsBuffer = {};
 
         function font(bits, width, height, amigaFont) {
@@ -374,8 +376,23 @@ var AnsiLove = (function () {
             return font(bytesToBits(file, width, height), width, height, amigaFont);
         }
 
+        function base64ToFile(text) {
+            var i, j, bytes16, bytes8;
+            bytes16 = new Uint32Array(1);
+            bytes8 = new Uint8Array(text.length / 4 * 3);
+            for (i = j = 0; i < text.length; bytes16[0] = 0) {
+                bytes16[0] += (BASE64_CHARS.indexOf(text.charAt(i++)) & 63) << 18;
+                bytes16[0] += (BASE64_CHARS.indexOf(text.charAt(i++)) & 63) << 12;
+                bytes16[0] += (BASE64_CHARS.indexOf(text.charAt(i++)) & 63) << 6;
+                bytes16[0] += BASE64_CHARS.indexOf(text.charAt(i++)) & 63;
+                bytes8[j++] = (bytes16[0] >> 16) & 255;
+                bytes8[j++] = (bytes16[0] >> 8) & 255;
+                bytes8[j++] = bytes16[0] & 255;
+            }
+            return new File(bytes8);
+        }
+
         function preset(name) {
-            var bytes;
             switch (name) {
             case "amiga":
                 name = "topaz";
@@ -391,10 +408,7 @@ var AnsiLove = (function () {
                 break;
             }
             if (!fontBitsBuffer[name]) {
-                bytes = new Uint8Array(atob(FONT_PRESETS[name].data).split("").map(function (c) {
-                    return c.charCodeAt(0);
-                }));
-                fontBitsBuffer[name] = bytesToBits(new File(bytes), FONT_PRESETS[name].width, FONT_PRESETS[name].height);
+                fontBitsBuffer[name] = bytesToBits(base64ToFile(FONT_PRESETS[name].data), FONT_PRESETS[name].width, FONT_PRESETS[name].height);
             }
             return font(fontBitsBuffer[name], FONT_PRESETS[name].width, FONT_PRESETS[name].height, FONT_PRESETS[name].amigaFont);
         }
diff --git a/jslint.json b/jslint.json
@@ -4,9 +4,9 @@
     "devel": true,
     "plusplus": true,
     "predef": [
-        "atob",
         "AnsiLove",
         "Uint8Array",
+        "Uint32Array",
         "FileReader"
     ]
 } 
\ No newline at end of file