mirror of
https://github.com/zxing/zxing.git
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7616c4d06d
git-svn-id: https://zxing.googlecode.com/svn/trunk@2558 59b500cc-1b3d-0410-9834-0bbf25fbcc57
442 lines
14 KiB
C#
Executable file
442 lines
14 KiB
C#
Executable file
using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Text;
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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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namespace com.google.zxing.qrcode.decoder
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{
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using DecodeHintType = com.google.zxing.DecodeHintType;
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using FormatException = com.google.zxing.FormatException;
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using BitSource = com.google.zxing.common.BitSource;
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using CharacterSetECI = com.google.zxing.common.CharacterSetECI;
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using DecoderResult = com.google.zxing.common.DecoderResult;
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using StringUtils = com.google.zxing.common.StringUtils;
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using com.google.zxing.common;
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/// <summary>
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/// <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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///
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/// @author Sean Owen
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/// </summary>
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internal sealed 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 = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ' ', '$', '%', '*', '+', '-', '.', '/', ':'};
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private const int GB2312_SUBSET = 1;
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private DecodedBitStreamParser()
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{
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: static com.google.zxing.common.DecoderResult decode(byte[] bytes, Version version, ErrorCorrectionLevel ecLevel, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.FormatException
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internal static DecoderResult decode(sbyte[] bytes, Version version, ErrorCorrectionLevel ecLevel, IDictionary<DecodeHintType, object> hints)
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{
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BitSource bits = new BitSource(bytes);
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StringBuilder result = new StringBuilder(50);
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IList<sbyte[]> byteSegments = new List<sbyte[]>(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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mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
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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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throw FormatException.FormatInstance;
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}
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// not really supported; all we do is ignore it
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// Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
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bits.readBits(16);
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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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throw FormatException.FormatInstance;
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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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decodeHanziSegment(bits, result, countHanzi);
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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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decodeNumericSegment(bits, result, count);
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}
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else if (mode == Mode.ALPHANUMERIC)
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{
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decodeAlphanumericSegment(bits, result, count, fc1InEffect);
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}
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else if (mode == Mode.BYTE)
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{
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decodeByteSegment(bits, result, count, currentCharacterSetECI, byteSegments, hints);
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}
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else if (mode == Mode.KANJI)
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{
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decodeKanjiSegment(bits, result, count);
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}
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else
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{
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throw FormatException.FormatInstance;
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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 (System.ArgumentException iae)
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{
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// from readBits() calls
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throw FormatException.FormatInstance;
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}
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return new DecoderResult(bytes, result.ToString(), byteSegments.Count == 0 ? null : byteSegments, ecLevel == null ? null : ecLevel.ToString());
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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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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static void decodeHanziSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count) throws com.google.zxing.FormatException
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private static void decodeHanziSegment(BitSource bits, StringBuilder result, 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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throw FormatException.FormatInstance;
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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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sbyte[] buffer = new sbyte[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] = (sbyte)((assembledTwoBytes >> 8) & 0xFF);
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buffer[offset + 1] = (sbyte)(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(new string(buffer, StringUtils.GB2312));
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result.Append(GetEncodedStringFromBuffer(buffer, StringUtils.GB2312));
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}
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catch (System.IO.IOException)
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{
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throw FormatException.FormatInstance;
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}
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}
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private static string GetEncodedStringFromBuffer(sbyte[] buffer, string encoding)
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{
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byte[] bytes = buffer.ToBytes();
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Encoding en = Encoding.GetEncoding(encoding);
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return en.GetString(bytes);
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static void decodeKanjiSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count) throws com.google.zxing.FormatException
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private static void decodeKanjiSegment(BitSource bits, StringBuilder result, 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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throw FormatException.FormatInstance;
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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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sbyte[] buffer = new sbyte[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] = (sbyte)(assembledTwoBytes >> 8);
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buffer[offset + 1] = (sbyte) 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(new string(buffer, StringUtils.SHIFT_JIS));
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result.Append(GetEncodedStringFromBuffer(buffer, StringUtils.SHIFT_JIS));
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}
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catch (System.IO.IOException)
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{
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throw FormatException.FormatInstance;
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}
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static void decodeByteSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count, com.google.zxing.common.CharacterSetECI currentCharacterSetECI, java.util.Collection<byte[]> byteSegments, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.FormatException
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private static void decodeByteSegment(BitSource bits, StringBuilder result, int count, CharacterSetECI currentCharacterSetECI, ICollection<sbyte[]> byteSegments, 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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throw FormatException.FormatInstance;
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}
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sbyte[] readBytes = new sbyte[count];
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for (int i = 0; i < count; i++)
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{
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readBytes[i] = (sbyte) 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.name();
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}
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try
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{
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//result.Append(new string(readBytes, encoding));
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result.Append(GetEncodedStringFromBuffer(readBytes, encoding));
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}
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catch (System.IO.IOException)
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{
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throw FormatException.FormatInstance;
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}
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byteSegments.Add(readBytes);
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static char toAlphaNumericChar(int value) throws com.google.zxing.FormatException
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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.FormatInstance;
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}
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return ALPHANUMERIC_CHARS[value];
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static void decodeAlphanumericSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count, boolean fc1InEffect) throws com.google.zxing.FormatException
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private static void decodeAlphanumericSegment(BitSource bits, StringBuilder result, int count, bool fc1InEffect)
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{
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// Read two characters at a time
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int start = result.Length;
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while (count > 1)
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{
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if (bits.available() < 11)
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{
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throw FormatException.FormatInstance;
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}
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int nextTwoCharsBits = bits.readBits(11);
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result.Append(toAlphaNumericChar(nextTwoCharsBits / 45));
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result.Append(toAlphaNumericChar(nextTwoCharsBits % 45));
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count -= 2;
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}
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if (count == 1)
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{
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// special case: one character left
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if (bits.available() < 6)
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{
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throw FormatException.FormatInstance;
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}
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result.Append(toAlphaNumericChar(bits.readBits(6)));
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}
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// See section 6.4.8.1, 6.4.8.2
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if (fc1InEffect)
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{
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// We need to massage the result a bit if in an FNC1 mode:
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for (int i = start; i < result.Length; i++)
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{
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if (result[i] == '%')
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{
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if (i < result.Length - 1 && result[i + 1] == '%')
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{
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// %% is rendered as %
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result.Remove(i + 1, 1);
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}
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else
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{
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// In alpha mode, % should be converted to FNC1 separator 0x1D
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result[i] = (char) 0x1D;
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}
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}
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}
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}
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static void decodeNumericSegment(com.google.zxing.common.BitSource bits, StringBuilder result, int count) throws com.google.zxing.FormatException
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private static void decodeNumericSegment(BitSource bits, StringBuilder result, int count)
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{
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// Read three digits at a time
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while (count >= 3)
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{
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// Each 10 bits encodes three digits
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if (bits.available() < 10)
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{
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throw FormatException.FormatInstance;
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}
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int threeDigitsBits = bits.readBits(10);
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if (threeDigitsBits >= 1000)
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{
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throw FormatException.FormatInstance;
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}
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result.Append(toAlphaNumericChar(threeDigitsBits / 100));
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result.Append(toAlphaNumericChar((threeDigitsBits / 10) % 10));
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result.Append(toAlphaNumericChar(threeDigitsBits % 10));
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count -= 3;
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}
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if (count == 2)
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{
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// Two digits left over to read, encoded in 7 bits
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if (bits.available() < 7)
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{
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throw FormatException.FormatInstance;
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}
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int twoDigitsBits = bits.readBits(7);
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if (twoDigitsBits >= 100)
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{
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throw FormatException.FormatInstance;
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}
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result.Append(toAlphaNumericChar(twoDigitsBits / 10));
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result.Append(toAlphaNumericChar(twoDigitsBits % 10));
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}
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else if (count == 1)
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{
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// One digit left over to read
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if (bits.available() < 4)
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{
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throw FormatException.FormatInstance;
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}
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int digitBits = bits.readBits(4);
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if (digitBits >= 10)
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{
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throw FormatException.FormatInstance;
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}
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result.Append(toAlphaNumericChar(digitBits));
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}
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}
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//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
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//ORIGINAL LINE: private static int parseECIValue(com.google.zxing.common.BitSource bits) throws com.google.zxing.FormatException
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private static int parseECIValue(BitSource bits)
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{
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int firstByte = bits.readBits(8);
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if ((firstByte & 0x80) == 0)
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{
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// just one byte
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return firstByte & 0x7F;
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}
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if ((firstByte & 0xC0) == 0x80)
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{
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// two bytes
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int secondByte = bits.readBits(8);
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return ((firstByte & 0x3F) << 8) | secondByte;
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}
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if ((firstByte & 0xE0) == 0xC0)
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{
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// three bytes
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int secondThirdBytes = bits.readBits(16);
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return ((firstByte & 0x1F) << 16) | secondThirdBytes;
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}
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throw FormatException.FormatInstance;
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}
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}
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} |