@zxing/text-encoding
Version:
Polyfill for the Encoding Living Standard's API.
42 lines • 1.64 kB
JavaScript
import { decoderError } from "../../encoding/encodings";
import { finished } from "../../encoding/finished";
import { end_of_stream, isASCIIByte } from "../../encoding/terminology";
/**
* @constructor
* @implements {Decoder}
* @param {!Array.<number>} index The encoding index.
* @param {{fatal: boolean}} options
*/
var SingleByteDecoder = /** @class */ (function () {
function SingleByteDecoder(index, options) {
this.index = index;
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.
*/
SingleByteDecoder.prototype.handler = function (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. Let code point be the index code point for byte − 0x80 in
// index single-byte.
var code_point = this.index[bite - 0x80];
// 4. If code point is null, return error.
if (!code_point)
return decoderError(this.fatal);
// 5. Return a code point whose value is code point.
return code_point;
};
return SingleByteDecoder;
}());
export { SingleByteDecoder };
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