mirror of
https://github.com/zxing/zxing.git
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65 lines
2.2 KiB
C#
65 lines
2.2 KiB
C#
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/*
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* Copyright 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using Result = com.google.zxing.Result;
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using TextParsedResult = com.google.zxing.client.result.TextParsedResult;
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namespace com.google.zxing.client.result.optional
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{
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/// <summary> Recognizes an NDEF message that encodes text according to the
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/// "Text Record Type Definition" specification.
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///
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/// </summary>
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/// <author> Sean Owen
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/// </author>
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/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
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/// </author>
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sealed class NDEFTextResultParser:AbstractNDEFResultParser
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{
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public static TextParsedResult parse(Result result)
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{
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sbyte[] bytes = result.RawBytes;
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if (bytes == null)
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{
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return null;
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}
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NDEFRecord ndefRecord = NDEFRecord.readRecord(bytes, 0);
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if (ndefRecord == null || !ndefRecord.MessageBegin || !ndefRecord.MessageEnd)
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{
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return null;
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}
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if (!ndefRecord.Type.Equals(NDEFRecord.TEXT_WELL_KNOWN_TYPE))
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{
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return null;
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}
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System.String[] languageText = decodeTextPayload(ndefRecord.Payload);
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return new TextParsedResult(languageText[0], languageText[1]);
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}
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internal static System.String[] decodeTextPayload(sbyte[] payload)
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{
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sbyte statusByte = payload[0];
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bool isUTF16 = (statusByte & 0x80) != 0;
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int languageLength = statusByte & 0x1F;
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// language is always ASCII-encoded:
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System.String language = bytesToString(payload, 1, languageLength, "US-ASCII");
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System.String encoding = isUTF16?"UTF-16":"UTF8";
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System.String text = bytesToString(payload, 1 + languageLength, payload.Length - languageLength - 1, encoding);
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return new System.String[]{language, text};
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}
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}
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}
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