@zxing/text-encoding
Version:
Polyfill for the Encoding Living Standard's API.
35 lines • 1.34 kB
JavaScript
import { encoderError } from "../../encoding/encodings";
import { finished } from "../../encoding/finished";
import { end_of_stream, isASCIICodePoint } from "../../encoding/terminology";
import { inRange } from "../../encoding/utilities";
/**
* @constructor
* @implements {Encoder}
* @param {{fatal: boolean}} options
*/
export class XUserDefinedEncoder {
constructor(options) {
this.fatal = options.fatal;
}
/**
* @param {Stream} stream Input stream.
* @param {number} code_point Next code point read from the stream.
* @return {(number|!Array.<number>)} Byte(s) to emit.
*/
handler(stream, code_point) {
// 1.If code point is end-of-stream, return finished.
if (code_point === end_of_stream)
return finished;
// 2. If code point is an ASCII code point, return a byte whose
// value is code point.
if (isASCIICodePoint(code_point))
return code_point;
// 3. If code point is in the range U+F780 to U+F7FF, inclusive,
// return a byte whose value is code point − 0xF780 + 0x80.
if (inRange(code_point, 0xF780, 0xF7FF))
return code_point - 0xF780 + 0x80;
// 4. Return error with code point.
return encoderError(code_point);
}
}
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