@zxing/text-encoding
Version:
Polyfill for the Encoding Living Standard's API.
42 lines • 1.92 kB
JavaScript
import { finished } from "../../encoding/finished";
import { end_of_stream } from "../../encoding/terminology";
import { inRange } from "../../encoding/utilities";
import { convertCodeUnitToBytes } from "./converCodeUnitToBytes";
/**
* @constructor
* @implements {Encoder}
* @param {boolean} utf16_be True if big-endian, false if little-endian.
* @param {{fatal: boolean}} options
*/
var UTF16Encoder = /** @class */ (function () {
function UTF16Encoder(utf16_be, options) {
this.utf16_be = utf16_be;
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.
*/
UTF16Encoder.prototype.handler = function (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 in the range U+0000 to U+FFFF, inclusive,
// return the sequence resulting of converting code point to
// bytes using utf-16be encoder flag.
if (inRange(code_point, 0x0000, 0xFFFF))
return convertCodeUnitToBytes(code_point, this.utf16_be);
// 3. Let lead be ((code point − 0x10000) >> 10) + 0xD800,
// converted to bytes using utf-16be encoder flag.
var lead = convertCodeUnitToBytes(((code_point - 0x10000) >> 10) + 0xD800, this.utf16_be);
// 4. Let trail be ((code point − 0x10000) & 0x3FF) + 0xDC00,
// converted to bytes using utf-16be encoder flag.
var trail = convertCodeUnitToBytes(((code_point - 0x10000) & 0x3FF) + 0xDC00, this.utf16_be);
// 5. Return a byte sequence of lead followed by trail.
return lead.concat(trail);
};
return UTF16Encoder;
}());
export { UTF16Encoder };
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