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@zxing/text-encoding

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Polyfill for the Encoding Living Standard's API.

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"use strict"; 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 {{fatal: boolean}} options * @param {boolean=} gbk_flag */ var GB18030Encoder = /** @class */ (function () { function GB18030Encoder(options, gbk_flag) { if (gbk_flag === void 0) { gbk_flag = undefined; } this.gbk_flag = gbk_flag; this.fatal = options.fatal; // gb18030's decoder has an associated gbk flag (initially unset). } /** * @param {Stream} stream Input stream. * @param {number} code_point Next code point read from the stream. * @return {(number|!Array.<number>)} Byte(s) to emit. */ GB18030Encoder.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. If code point is U+E5E5, return error with code point. if (code_point === 0xE5E5) return encodings_1.encoderError(code_point); // 4. If the gbk flag is set and code point is U+20AC, return // byte 0x80. if (this.gbk_flag && code_point === 0x20AC) return 0x80; // 5. Let pointer be the index pointer for code point in index // gb18030. var pointer = indexes_1.indexPointerFor(code_point, indexes_1.index('gb18030')); // 6. If pointer is not null, run these substeps: if (pointer !== null) { // 1. Let lead be Math.floor(pointer / 190) + 0x81. var lead = Math.floor(pointer / 190) + 0x81; // 2. Let trail be pointer % 190. var trail = pointer % 190; // 3. Let offset be 0x40 if trail is less than 0x3F and 0x41 otherwise. var offset = trail < 0x3F ? 0x40 : 0x41; // 4. Return two bytes whose values are lead and trail + offset. return [lead, trail + offset]; } // 7. If gbk flag is set, return error with code point. if (this.gbk_flag) return encodings_1.encoderError(code_point); // 8. Set pointer to the index gb18030 ranges pointer for code // point. pointer = indexes_1.indexGB18030RangesPointerFor(code_point); // 9. Let byte1 be Math.floor(pointer / 10 / 126 / 10). var byte1 = Math.floor(pointer / 10 / 126 / 10); // 10. Set pointer to pointer − byte1 × 10 × 126 × 10. pointer = pointer - byte1 * 10 * 126 * 10; // 11. Let byte2 be Math.floor(pointer / 10 / 126). var byte2 = Math.floor(pointer / 10 / 126); // 12. Set pointer to pointer − byte2 × 10 × 126. pointer = pointer - byte2 * 10 * 126; // 13. Let byte3 be Math.floor(pointer / 10). var byte3 = Math.floor(pointer / 10); // 14. Let byte4 be pointer − byte3 × 10. var byte4 = pointer - byte3 * 10; // 15. Return four bytes whose values are byte1 + 0x81, byte2 + // 0x30, byte3 + 0x81, byte4 + 0x30. return [byte1 + 0x81, byte2 + 0x30, byte3 + 0x81, byte4 + 0x30]; }; return GB18030Encoder; }()); exports.GB18030Encoder = GB18030Encoder; //# sourceMappingURL=GB18030Encoder.js.map