ontimize-web-ngx
Version:
Ontimize Web framework using Angular 15
67 lines • 11.2 kB
JavaScript
export class Base64 {
static decode(s) {
let pads = 0, i, b10, imax = s.length, x = [];
s = String(s);
if (imax === 0) {
return s;
}
if (s.charAt(imax - 1) === this.PADCHAR) {
pads = 1;
if (s.charAt(imax - 2) === this.PADCHAR) {
pads = 2;
}
imax -= 4;
}
for (i = 0; i < imax; i += 4) {
b10 = (this.getByte64(s, i) << 18) | (this.getByte64(s, i + 1) << 12) | (this.getByte64(s, i + 2) << 6) | this.getByte64(s, i + 3);
x.push(String.fromCharCode(b10 >> 16, (b10 >> 8) & 255, b10 & 255));
}
switch (pads) {
case 1:
b10 = (this.getByte64(s, i) << 18) | (this.getByte64(s, i + 1) << 12) | (this.getByte64(s, i + 2) << 6);
x.push(String.fromCharCode(b10 >> 16, (b10 >> 8) & 255));
break;
case 2:
b10 = (this.getByte64(s, i) << 18) | (this.getByte64(s, i + 1) << 12);
x.push(String.fromCharCode(b10 >> 16));
break;
}
return x.join('');
}
static encode(s) {
s = String(s);
let i, b10, x = [], imax = s.length - s.length % 3;
if (s.length === 0) {
return s;
}
for (i = 0; i < imax; i += 3) {
b10 = (this.getByte(s, i) << 16) | (this.getByte(s, i + 1) << 8) | this.getByte(s, i + 2);
x.push(this.ALPHA.charAt(b10 >> 18));
x.push(this.ALPHA.charAt((b10 >> 12) & 63));
x.push(this.ALPHA.charAt((b10 >> 6) & 63));
x.push(this.ALPHA.charAt(b10 & 63));
}
switch (s.length - imax) {
case 1:
b10 = this.getByte(s, i) << 16;
x.push(this.ALPHA.charAt(b10 >> 18) + this.ALPHA.charAt((b10 >> 12) & 63) + this.PADCHAR + this.PADCHAR);
break;
case 2:
b10 = (this.getByte(s, i) << 16) | (this.getByte(s, i + 1) << 8);
x.push(this.ALPHA.charAt(b10 >> 18) + this.ALPHA.charAt((b10 >> 12) & 63) + this.ALPHA.charAt((b10 >> 6) & 63) + this.PADCHAR);
break;
}
return x.join('');
}
static getByte(s, i) {
const x = s.charCodeAt(i);
return x;
}
static getByte64(s, i) {
const idx = this.ALPHA.indexOf(s.charAt(i));
return idx;
}
}
Base64.PADCHAR = '=';
Base64.ALPHA = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
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i < imax; i += 4) {\n      b10 = (this.getByte64(s, i) << 18) | (this.getByte64(s, i + 1) << 12) | (this.getByte64(s, i + 2) << 6) | this.getByte64(s, i + 3);\n      x.push(String.fromCharCode(b10 >> 16, (b10 >> 8) & 255, b10 & 255));\n    }\n\n    switch (pads) {\n      case 1:\n        b10 = (this.getByte64(s, i) << 18) | (this.getByte64(s, i + 1) << 12) | (this.getByte64(s, i + 2) << 6);\n        x.push(String.fromCharCode(b10 >> 16, (b10 >> 8) & 255));\n        break;\n      case 2:\n        b10 = (this.getByte64(s, i) << 18) | (this.getByte64(s, i + 1) << 12);\n        x.push(String.fromCharCode(b10 >> 16));\n        break;\n    }\n\n    return x.join('');\n  }\n\n  public static encode(s: string): string {\n    s = String(s);\n\n    let i, b10, x = [],\n      imax = s.length - s.length % 3;\n\n    if (s.length === 0) {\n      return s;\n    }\n\n    for (i = 0; i < imax; i += 3) {\n      b10 = (this.getByte(s, i) << 16) | (this.getByte(s, i + 1) << 8) | this.getByte(s, i + 2);\n      x.push(this.ALPHA.charAt(b10 >> 18));\n      x.push(this.ALPHA.charAt((b10 >> 12) & 63));\n      x.push(this.ALPHA.charAt((b10 >> 6) & 63));\n      x.push(this.ALPHA.charAt(b10 & 63));\n    }\n\n    switch (s.length - imax) {\n      case 1:\n        b10 = this.getByte(s, i) << 16;\n        x.push(this.ALPHA.charAt(b10 >> 18) + this.ALPHA.charAt((b10 >> 12) & 63) + this.PADCHAR + this.PADCHAR);\n        break;\n      case 2:\n        b10 = (this.getByte(s, i) << 16) | (this.getByte(s, i + 1) << 8);\n        x.push(this.ALPHA.charAt(b10 >> 18) + this.ALPHA.charAt((b10 >> 12) & 63) + this.ALPHA.charAt((b10 >> 6) & 63) + this.PADCHAR);\n        break;\n    }\n\n    return x.join('');\n  }\n\n  private static getByte(s: string, i: number): number {\n    const x = s.charCodeAt(i);\n    return x;\n  }\n\n  private static getByte64(s: string, i: number): number {\n    const idx = this.ALPHA.indexOf(s.charAt(i));\n    return idx;\n  }\n\n}\n"]}