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https://gitee.com/akwkevin/aistudio.-wpf.-diagram
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524 lines
18 KiB
C#
524 lines
18 KiB
C#
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/*
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* Copyright 2007 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 System.Collections.Generic;
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using System.Text;
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using ZXing.Common;
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namespace ZXing.QrCode.Internal
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{
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/// <summary> <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
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/// in one QR Code. This class decodes the bits back into text.</p>
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///
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/// <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
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/// <author>Sean Owen</author>
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/// </summary>
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internal static class DecodedBitStreamParser
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{
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/// <summary>
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/// See ISO 18004:2006, 6.4.4 Table 5
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/// </summary>
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private static readonly char[] ALPHANUMERIC_CHARS = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
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'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
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'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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' ', '$', '%', '*', '+', '-', '.', '/', ':'
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};
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private const int GB2312_SUBSET = 1;
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internal static DecoderResult decode(byte[] bytes,
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Version version,
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ErrorCorrectionLevel ecLevel,
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IDictionary<DecodeHintType, object> hints)
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{
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var bits = new BitSource(bytes);
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var result = new StringBuilder(50);
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var byteSegments = new List<byte[]>(1);
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var symbolSequence = -1;
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var parityData = -1;
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try
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{
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CharacterSetECI currentCharacterSetECI = null;
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bool fc1InEffect = false;
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Mode mode;
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do
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{
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// While still another segment to read...
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if (bits.available() < 4)
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{
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// OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
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mode = Mode.TERMINATOR;
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}
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else
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{
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try
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{
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mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
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}
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catch (ArgumentException)
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{
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return null;
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}
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}
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if (mode != Mode.TERMINATOR)
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{
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if (mode == Mode.FNC1_FIRST_POSITION || mode == Mode.FNC1_SECOND_POSITION)
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{
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// We do little with FNC1 except alter the parsed result a bit according to the spec
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fc1InEffect = true;
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}
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else if (mode == Mode.STRUCTURED_APPEND)
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{
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if (bits.available() < 16)
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{
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return null;
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}
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// not really supported; but sequence number and parity is added later to the result metadata
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// Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
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symbolSequence = bits.readBits(8);
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parityData = bits.readBits(8);
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}
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else if (mode == Mode.ECI)
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{
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// Count doesn't apply to ECI
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int value = parseECIValue(bits);
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currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
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if (currentCharacterSetECI == null)
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{
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return null;
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}
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}
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else
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{
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// First handle Hanzi mode which does not start with character count
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if (mode == Mode.HANZI)
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{
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//chinese mode contains a sub set indicator right after mode indicator
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int subset = bits.readBits(4);
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int countHanzi = bits.readBits(mode.getCharacterCountBits(version));
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if (subset == GB2312_SUBSET)
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{
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if (!decodeHanziSegment(bits, result, countHanzi))
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return null;
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}
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}
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else
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{
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// "Normal" QR code modes:
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// How many characters will follow, encoded in this mode?
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int count = bits.readBits(mode.getCharacterCountBits(version));
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if (mode == Mode.NUMERIC)
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{
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if (!decodeNumericSegment(bits, result, count))
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return null;
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}
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else if (mode == Mode.ALPHANUMERIC)
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{
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if (!decodeAlphanumericSegment(bits, result, count, fc1InEffect))
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return null;
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}
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else if (mode == Mode.BYTE)
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{
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if (!decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments, hints))
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return null;
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}
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else if (mode == Mode.KANJI)
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{
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if (!decodeKanjiSegment(bits, result, count))
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return null;
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}
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else
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{
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return null;
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}
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}
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}
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}
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} while (mode != Mode.TERMINATOR);
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}
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catch (ArgumentException)
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{
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// from readBits() calls
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return null;
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}
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#if WindowsCE
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var resultString = result.ToString().Replace("\n", "\r\n");
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#else
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var resultString = result.ToString().Replace("\r\n", "\n").Replace("\n", Environment.NewLine);
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#endif
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return new DecoderResult(bytes,
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resultString,
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byteSegments.Count == 0 ? null : byteSegments,
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ecLevel == null ? null : ecLevel.ToString(),
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symbolSequence, parityData);
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}
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/// <summary>
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/// See specification GBT 18284-2000
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/// </summary>
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/// <param name="bits">The bits.</param>
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/// <param name="result">The result.</param>
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/// <param name="count">The count.</param>
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/// <returns></returns>
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private static bool decodeHanziSegment(BitSource bits,
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StringBuilder result,
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int count)
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{
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// Don't crash trying to read more bits than we have available.
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if (count * 13 > bits.available())
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{
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return false;
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}
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// Each character will require 2 bytes. Read the characters as 2-byte pairs
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// and decode as GB2312 afterwards
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byte[] buffer = new byte[2 * count];
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int offset = 0;
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while (count > 0)
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{
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// Each 13 bits encodes a 2-byte character
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int twoBytes = bits.readBits(13);
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int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
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if (assembledTwoBytes < 0x003BF)
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{
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// In the 0xA1A1 to 0xAAFE range
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assembledTwoBytes += 0x0A1A1;
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}
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else
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{
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// In the 0xB0A1 to 0xFAFE range
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assembledTwoBytes += 0x0A6A1;
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}
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buffer[offset] = (byte)((assembledTwoBytes >> 8) & 0xFF);
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buffer[offset + 1] = (byte)(assembledTwoBytes & 0xFF);
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offset += 2;
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count--;
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}
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try
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{
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result.Append(Encoding.GetEncoding(StringUtils.GB2312).GetString(buffer, 0, buffer.Length));
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}
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#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || MONOANDROID || MONOTOUCH)
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catch (ArgumentException)
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{
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try
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{
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// Silverlight only supports a limited number of character sets, trying fallback to UTF-8
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result.Append(Encoding.GetEncoding("UTF-8").GetString(buffer, 0, buffer.Length));
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}
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catch (Exception)
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{
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return false;
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}
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}
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#endif
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catch (Exception)
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{
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return false;
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}
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return true;
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}
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private static bool decodeKanjiSegment(BitSource bits,
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StringBuilder result,
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int count)
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{
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// Don't crash trying to read more bits than we have available.
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if (count * 13 > bits.available())
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{
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return false;
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}
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// Each character will require 2 bytes. Read the characters as 2-byte pairs
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// and decode as Shift_JIS afterwards
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byte[] buffer = new byte[2 * count];
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int offset = 0;
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while (count > 0)
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{
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// Each 13 bits encodes a 2-byte character
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int twoBytes = bits.readBits(13);
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int assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
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if (assembledTwoBytes < 0x01F00)
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{
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// In the 0x8140 to 0x9FFC range
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assembledTwoBytes += 0x08140;
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}
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else
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{
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// In the 0xE040 to 0xEBBF range
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assembledTwoBytes += 0x0C140;
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}
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buffer[offset] = (byte)(assembledTwoBytes >> 8);
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buffer[offset + 1] = (byte)assembledTwoBytes;
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offset += 2;
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count--;
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}
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// Shift_JIS may not be supported in some environments:
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try
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{
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result.Append(Encoding.GetEncoding(StringUtils.SHIFT_JIS).GetString(buffer, 0, buffer.Length));
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}
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#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || MONOANDROID || MONOTOUCH)
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catch (ArgumentException)
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{
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try
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{
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// Silverlight only supports a limited number of character sets, trying fallback to UTF-8
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result.Append(Encoding.GetEncoding("UTF-8").GetString(buffer, 0, buffer.Length));
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}
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catch (Exception)
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{
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return false;
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}
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}
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#endif
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catch (Exception)
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{
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return false;
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}
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return true;
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}
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private static bool decodeByteSegment(BitSource bits,
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StringBuilder result,
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int count,
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CharacterSetECI currentCharacterSetECI,
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IList<byte[]> byteSegments,
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IDictionary<DecodeHintType, object> hints)
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{
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// Don't crash trying to read more bits than we have available.
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if (count << 3 > bits.available())
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{
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return false;
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}
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byte[] readBytes = new byte[count];
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for (int i = 0; i < count; i++)
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{
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readBytes[i] = (byte)bits.readBits(8);
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}
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String encoding;
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if (currentCharacterSetECI == null)
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{
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// The spec isn't clear on this mode; see
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// section 6.4.5: t does not say which encoding to assuming
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// upon decoding. I have seen ISO-8859-1 used as well as
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// Shift_JIS -- without anything like an ECI designator to
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// give a hint.
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encoding = StringUtils.guessEncoding(readBytes, hints);
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}
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else
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{
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encoding = currentCharacterSetECI.EncodingName;
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}
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try
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{
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result.Append(Encoding.GetEncoding(encoding).GetString(readBytes, 0, readBytes.Length));
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}
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#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || MONOANDROID || MONOTOUCH)
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catch (ArgumentException)
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{
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try
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{
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// Silverlight only supports a limited number of character sets, trying fallback to UTF-8
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result.Append(Encoding.GetEncoding("UTF-8").GetString(readBytes, 0, readBytes.Length));
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}
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catch (Exception)
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{
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return false;
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}
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}
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#endif
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#if WindowsCE
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catch (PlatformNotSupportedException)
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{
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try
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{
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// WindowsCE doesn't support all encodings. But it is device depended.
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// So we try here the some different ones
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if (encoding == "ISO-8859-1")
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{
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result.Append(Encoding.GetEncoding(1252).GetString(readBytes, 0, readBytes.Length));
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}
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else
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{
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result.Append(Encoding.GetEncoding("UTF-8").GetString(readBytes, 0, readBytes.Length));
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}
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}
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catch (Exception)
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{
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return false;
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}
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}
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#endif
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catch (Exception)
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{
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return false;
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}
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byteSegments.Add(readBytes);
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return true;
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}
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private static char toAlphaNumericChar(int value)
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{
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if (value >= ALPHANUMERIC_CHARS.Length)
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{
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throw FormatException.Instance;
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}
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return ALPHANUMERIC_CHARS[value];
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}
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|
private static bool decodeAlphanumericSegment(BitSource bits,
|
||
|
|
StringBuilder result,
|
||
|
|
int count,
|
||
|
|
bool fc1InEffect)
|
||
|
|
{
|
||
|
|
// Read two characters at a time
|
||
|
|
int start = result.Length;
|
||
|
|
while (count > 1)
|
||
|
|
{
|
||
|
|
if (bits.available() < 11)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
int nextTwoCharsBits = bits.readBits(11);
|
||
|
|
result.Append(toAlphaNumericChar(nextTwoCharsBits / 45));
|
||
|
|
result.Append(toAlphaNumericChar(nextTwoCharsBits % 45));
|
||
|
|
count -= 2;
|
||
|
|
}
|
||
|
|
if (count == 1)
|
||
|
|
{
|
||
|
|
// special case: one character left
|
||
|
|
if (bits.available() < 6)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
result.Append(toAlphaNumericChar(bits.readBits(6)));
|
||
|
|
}
|
||
|
|
|
||
|
|
// See section 6.4.8.1, 6.4.8.2
|
||
|
|
if (fc1InEffect)
|
||
|
|
{
|
||
|
|
// We need to massage the result a bit if in an FNC1 mode:
|
||
|
|
for (int i = start; i < result.Length; i++)
|
||
|
|
{
|
||
|
|
if (result[i] == '%')
|
||
|
|
{
|
||
|
|
if (i < result.Length - 1 && result[i + 1] == '%')
|
||
|
|
{
|
||
|
|
// %% is rendered as %
|
||
|
|
result.Remove(i + 1, 1);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// In alpha mode, % should be converted to FNC1 separator 0x1D
|
||
|
|
result.Remove(i, 1);
|
||
|
|
result.Insert(i, new[] { (char)0x1D });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static bool decodeNumericSegment(BitSource bits,
|
||
|
|
StringBuilder result,
|
||
|
|
int count)
|
||
|
|
{
|
||
|
|
// Read three digits at a time
|
||
|
|
while (count >= 3)
|
||
|
|
{
|
||
|
|
// Each 10 bits encodes three digits
|
||
|
|
if (bits.available() < 10)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
int threeDigitsBits = bits.readBits(10);
|
||
|
|
if (threeDigitsBits >= 1000)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
result.Append(toAlphaNumericChar(threeDigitsBits / 100));
|
||
|
|
result.Append(toAlphaNumericChar((threeDigitsBits / 10) % 10));
|
||
|
|
result.Append(toAlphaNumericChar(threeDigitsBits % 10));
|
||
|
|
|
||
|
|
count -= 3;
|
||
|
|
}
|
||
|
|
if (count == 2)
|
||
|
|
{
|
||
|
|
// Two digits left over to read, encoded in 7 bits
|
||
|
|
if (bits.available() < 7)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
int twoDigitsBits = bits.readBits(7);
|
||
|
|
if (twoDigitsBits >= 100)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
result.Append(toAlphaNumericChar(twoDigitsBits / 10));
|
||
|
|
result.Append(toAlphaNumericChar(twoDigitsBits % 10));
|
||
|
|
}
|
||
|
|
else if (count == 1)
|
||
|
|
{
|
||
|
|
// One digit left over to read
|
||
|
|
if (bits.available() < 4)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
int digitBits = bits.readBits(4);
|
||
|
|
if (digitBits >= 10)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
result.Append(toAlphaNumericChar(digitBits));
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static int parseECIValue(BitSource bits)
|
||
|
|
{
|
||
|
|
int firstByte = bits.readBits(8);
|
||
|
|
if ((firstByte & 0x80) == 0)
|
||
|
|
{
|
||
|
|
// just one byte
|
||
|
|
return firstByte & 0x7F;
|
||
|
|
}
|
||
|
|
if ((firstByte & 0xC0) == 0x80)
|
||
|
|
{
|
||
|
|
// two bytes
|
||
|
|
int secondByte = bits.readBits(8);
|
||
|
|
return ((firstByte & 0x3F) << 8) | secondByte;
|
||
|
|
}
|
||
|
|
if ((firstByte & 0xE0) == 0xC0)
|
||
|
|
{
|
||
|
|
// three bytes
|
||
|
|
int secondThirdBytes = bits.readBits(16);
|
||
|
|
return ((firstByte & 0x1F) << 16) | secondThirdBytes;
|
||
|
|
}
|
||
|
|
throw new ArgumentException("Bad ECI bits starting with byte " + firstByte);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
