@zxing/text-encoding
Version:
Polyfill for the Encoding Living Standard's API.
31 lines • 1.11 kB
JavaScript
import { finished } from "../../encoding/finished";
import { end_of_stream, isASCIIByte } from "../../encoding/terminology";
/**
* @constructor
* @implements {Decoder}
* @param {{fatal: boolean}} options
*/
export class XUserDefinedDecoder {
constructor(options) {
this.fatal = options.fatal;
}
/**
* @param {Stream} stream The stream of bytes being decoded.
* @param {number} bite The next byte read from the stream.
* @return {?(number|!Array.<number>)} The next code point(s)
* decoded, or null if not enough data exists in the input
* stream to decode a complete code point.
*/
handler(stream, bite) {
// 1. If byte is end-of-stream, return finished.
if (bite === end_of_stream)
return finished;
// 2. If byte is an ASCII byte, return a code point whose value
// is byte.
if (isASCIIByte(bite))
return bite;
// 3. Return a code point whose value is 0xF780 + byte − 0x80.
return 0xF780 + bite - 0x80;
}
}
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