@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
61 lines (60 loc) • 1.78 kB
JavaScript
import { C40Encoder } from './C40Encoder';
import { TEXT_ENCODATION } from './constants';
export class TextEncoder extends C40Encoder {
getEncodingMode() {
return TEXT_ENCODATION;
}
encodeChar(c, sb) {
if (c === ' '.charCodeAt(0)) {
sb.append(0o3);
return 1;
}
if (c >= '0'.charCodeAt(0) && c <= '9'.charCodeAt(0)) {
sb.append(c - 48 + 4);
return 1;
}
if (c >= 'a'.charCodeAt(0) && c <= 'z'.charCodeAt(0)) {
sb.append(c - 97 + 14);
return 1;
}
if (c < ' '.charCodeAt(0)) {
sb.append(0o0); // Shift 1 Set
sb.append(c);
return 2;
}
if (c <= '/'.charCodeAt(0)) {
sb.append(0o1); // Shift 2 Set
sb.append(c - 33);
return 2;
}
if (c <= '@'.charCodeAt(0)) {
sb.append(0o1); // Shift 2 Set
sb.append(c - 58 + 15);
return 2;
}
if (c >= '['.charCodeAt(0) && c <= '_'.charCodeAt(0)) {
sb.append(0o1); // Shift 2 Set
sb.append(c - 91 + 22);
return 2;
}
if (c === '`'.charCodeAt(0)) {
sb.append(0o2); // Shift 3 Set
sb.append(0); // '`' - 96 == 0
return 2;
}
if (c <= 'Z'.charCodeAt(0)) {
sb.append(0o2); // Shift 3 Set
sb.append(c - 65 + 1);
return 2;
}
if (c <= 127) {
sb.append(0o2); // Shift 3 Set
sb.append(c - 123 + 27);
return 2;
}
sb.append(`${0o1}\u001e`); // Shift 2, Upper Shift
let len = 2;
len += this.encodeChar(c - 128, sb);
return len;
}
}