@zxing/text-encoding
Version:
Polyfill for the Encoding Living Standard's API.
43 lines • 1.76 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var encodings_1 = require("../../encoding/encodings");
var finished_1 = require("../../encoding/finished");
var indexes_1 = require("../../encoding/indexes");
var terminology_1 = require("../../encoding/terminology");
/**
* @constructor
* @implements {Encoder}
* @param {!Array.<?number>} index The encoding index.
* @param {{fatal: boolean}} options
*/
var SingleByteEncoder = /** @class */ (function () {
function SingleByteEncoder(index, options) {
this.index = index;
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.
*/
SingleByteEncoder.prototype.handler = function (stream, code_point) {
// 1. If code point is end-of-stream, return finished.
if (code_point === terminology_1.end_of_stream)
return finished_1.finished;
// 2. If code point is an ASCII code point, return a byte whose
// value is code point.
if (terminology_1.isASCIICodePoint(code_point))
return code_point;
// 3. Let pointer be the index pointer for code point in index
// single-byte.
var pointer = indexes_1.indexPointerFor(code_point, this.index);
// 4. If pointer is null, return error with code point.
if (pointer === null)
encodings_1.encoderError(code_point);
// 5. Return a byte whose value is pointer + 0x80.
return pointer + 0x80;
};
return SingleByteEncoder;
}());
exports.SingleByteEncoder = SingleByteEncoder;
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