v3-h5-web/node_modules/@zxing/text-encoding/cjs/coders/single-byte/SingleByteDecoder.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var encodings_1 = require("../../encoding/encodings");
var finished_1 = require("../../encoding/finished");
var terminology_1 = require("../../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 === terminology_1.end_of_stream)
            return finished_1.finished;
        // 2. If byte is an ASCII byte, return a code point whose value
        // is byte.
        if (terminology_1.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 encodings_1.decoderError(this.fatal);
        // 5. Return a code point whose value is code point.
        return code_point;
    };
    return SingleByteDecoder;
}());
exports.SingleByteDecoder = SingleByteDecoder;
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