70 lines
1.6 KiB
JavaScript
70 lines
1.6 KiB
JavaScript
function compressMaze(maze) {
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if(maze == undefined) return undefined;
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if(maze.length == 0) return [0, 0];
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var a = [];
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var x, y, i;
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for(x = 0; x < maze.length; x++) {
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for(y = 0; y < maze[x].length; y++) {
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a.push(maze[x][y][0]);
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a.push(maze[x][y][1]);
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a.push(maze[x][y][2]);
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a.push(maze[x][y][3]);
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}
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}
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return a;
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}
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function expandMaze(maze, w, h) {
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if(maze == undefined) return undefined;
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if(w == 0 || h == 0) return [];
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var a = [];
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for(x = 0; x < w; x++) {
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a.push([]);
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for(y = 0; y < h; y++) {
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a[x][y] = [];
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var index = 4*(y + x*h)
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a[x][y].push(maze[index+0]);
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a[x][y].push(maze[index+1]);
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a[x][y].push(maze[index+2]);
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a[x][y].push(maze[index+3]);
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}
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}
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return a;
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}
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var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
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function arrToB64(arr) {
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while(arr.length%6 != 0) {
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arr.push(false);
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}
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var str = '';
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while(arr.length > 0) {
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var n = arr.shift()*32+arr.shift()*16+arr.shift()*8+arr.shift()*4+arr.shift()*2+arr.shift();
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str += b64[n];
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}
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return str;
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}
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function b64ToArr(str64) {
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var arr = [];
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for(var i = 0; i < str64.length; i++) {
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var index = b64.indexOf(str64[i]);
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if(index<0) continue;
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arr.push((index>>5)%2 != 0);
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arr.push((index>>4)%2 != 0);
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arr.push((index>>3)%2 != 0);
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arr.push((index>>2)%2 != 0);
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arr.push((index>>1)%2 != 0);
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arr.push((index>>0)%2 != 0);
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}
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return arr;
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}
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function encode(maze) {
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return arrToB64(compressMaze(maze));
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}
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function decode(code, w, h) {
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return expandMaze(b64ToArr(code), w, h);
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}
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