Package com.google.zxing.datamatrix.decoder

Class DecodedBitStreamParser

java.lang.Object

com.google.zxing.datamatrix.decoder.DecodedBitStreamParser

final class DecodedBitStreamParser
extends java.lang.Object

Data Matrix Codes can encode text as bits in one of several modes, and can use multiple modes in one Data Matrix Code. This class decodes the bits back into text.

See ISO 16022:2006, 5.2.1 - 5.2.9.2

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	DecodedBitStreamParser.Mode

Field Summary

Fields

Modifier and Type	Field	Description
private static char[]	C40_BASIC_SET_CHARS	See ISO 16022:2006, Annex C Table C.1 The C40 Basic Character Set (*'s used for placeholders for the shift values)
private static char[]	C40_SHIFT2_SET_CHARS
private static char[]	TEXT_BASIC_SET_CHARS	See ISO 16022:2006, Annex C Table C.2 The Text Basic Character Set (*'s used for placeholders for the shift values)
private static char[]	TEXT_SHIFT2_SET_CHARS
private static char[]	TEXT_SHIFT3_SET_CHARS

Constructor Summary

Constructors

Modifier	Constructor	Description
private	DecodedBitStreamParser()

Method Summary

Modifier and Type	Method	Description
(package private) static DecoderResult	decode(byte[] bytes)
private static void	decodeAnsiX12Segment(BitSource bits, ECIStringBuilder result)	See ISO 16022:2006, 5.2.7
private static DecodedBitStreamParser.Mode	decodeAsciiSegment(BitSource bits, ECIStringBuilder result, java.lang.StringBuilder resultTrailer, java.util.Set<java.lang.Integer> fnc1positions)	See ISO 16022:2006, 5.2.3 and Annex C, Table C.2
private static void	decodeBase256Segment(BitSource bits, ECIStringBuilder result, java.util.Collection<byte[]> byteSegments)	See ISO 16022:2006, 5.2.9 and Annex B, B.2
private static void	decodeC40Segment(BitSource bits, ECIStringBuilder result, java.util.Set<java.lang.Integer> fnc1positions)	See ISO 16022:2006, 5.2.5 and Annex C, Table C.1
private static void	decodeECISegment(BitSource bits, ECIStringBuilder result)	See ISO 16022:2007, 5.4.1
private static void	decodeEdifactSegment(BitSource bits, ECIStringBuilder result)	See ISO 16022:2006, 5.2.8 and Annex C Table C.3
private static void	decodeTextSegment(BitSource bits, ECIStringBuilder result, java.util.Set<java.lang.Integer> fnc1positions)	See ISO 16022:2006, 5.2.6 and Annex C, Table C.2
private static void	parseTwoBytes(int firstByte, int secondByte, int[] result)
private static int	unrandomize255State(int randomizedBase256Codeword, int base256CodewordPosition)	See ISO 16022:2006, Annex B, B.2

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

C40_BASIC_SET_CHARS

private static final char[] C40_BASIC_SET_CHARS

See ISO 16022:2006, Annex C Table C.1 The C40 Basic Character Set (*'s used for placeholders for the shift values)

C40_SHIFT2_SET_CHARS

private static final char[] C40_SHIFT2_SET_CHARS

TEXT_BASIC_SET_CHARS

private static final char[] TEXT_BASIC_SET_CHARS

See ISO 16022:2006, Annex C Table C.2 The Text Basic Character Set (*'s used for placeholders for the shift values)

TEXT_SHIFT2_SET_CHARS

private static final char[] TEXT_SHIFT2_SET_CHARS

TEXT_SHIFT3_SET_CHARS

private static final char[] TEXT_SHIFT3_SET_CHARS

Constructor Detail

DecodedBitStreamParser

private DecodedBitStreamParser()

Method Detail

decode

static DecoderResult decode(byte[] bytes)
                     throws FormatException

Throws:

FormatException

decodeAsciiSegment

private static DecodedBitStreamParser.Mode decodeAsciiSegment(BitSource bits,
                                                              ECIStringBuilder result,
                                                              java.lang.StringBuilder resultTrailer,
                                                              java.util.Set<java.lang.Integer> fnc1positions)
                                                       throws FormatException

See ISO 16022:2006, 5.2.3 and Annex C, Table C.2

Throws:

FormatException

decodeC40Segment

private static void decodeC40Segment(BitSource bits,
                                     ECIStringBuilder result,
                                     java.util.Set<java.lang.Integer> fnc1positions)
                              throws FormatException

See ISO 16022:2006, 5.2.5 and Annex C, Table C.1

Throws:

FormatException

decodeTextSegment

private static void decodeTextSegment(BitSource bits,
                                      ECIStringBuilder result,
                                      java.util.Set<java.lang.Integer> fnc1positions)
                               throws FormatException

See ISO 16022:2006, 5.2.6 and Annex C, Table C.2

Throws:

FormatException

decodeAnsiX12Segment

private static void decodeAnsiX12Segment(BitSource bits,
                                         ECIStringBuilder result)
                                  throws FormatException

See ISO 16022:2006, 5.2.7

Throws:

FormatException

parseTwoBytes

private static void parseTwoBytes(int firstByte,
                                  int secondByte,
                                  int[] result)

decodeEdifactSegment

private static void decodeEdifactSegment(BitSource bits,
                                         ECIStringBuilder result)

See ISO 16022:2006, 5.2.8 and Annex C Table C.3

decodeBase256Segment

private static void decodeBase256Segment(BitSource bits,
                                         ECIStringBuilder result,
                                         java.util.Collection<byte[]> byteSegments)
                                  throws FormatException

See ISO 16022:2006, 5.2.9 and Annex B, B.2

Throws:

FormatException

decodeECISegment

private static void decodeECISegment(BitSource bits,
                                     ECIStringBuilder result)
                              throws FormatException

See ISO 16022:2007, 5.4.1

Throws:

FormatException

unrandomize255State

private static int unrandomize255State(int randomizedBase256Codeword,
                                       int base256CodewordPosition)

See ISO 16022:2006, Annex B, B.2