Package com.google.zxing.qrcode.decoder

Class DecodedBitStreamParser

java.lang.Object

com.google.zxing.qrcode.decoder.DecodedBitStreamParser

final class DecodedBitStreamParser
extends java.lang.Object

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

See ISO 18004:2006, 6.4.3 - 6.4.7

Field Summary

Fields

Modifier and Type	Field	Description
private static char[]	ALPHANUMERIC_CHARS	See ISO 18004:2006, 6.4.4 Table 5
private static int	GB2312_SUBSET

Constructor Summary

Constructors

Modifier	Constructor	Description
private	DecodedBitStreamParser()

Method Summary

Modifier and Type	Method	Description
(package private) static DecoderResult	decode(byte[] bytes, Version version, ErrorCorrectionLevel ecLevel, java.util.Map<DecodeHintType,?> hints)
private static void	decodeAlphanumericSegment(BitSource bits, java.lang.StringBuilder result, int count, boolean fc1InEffect)
private static void	decodeByteSegment(BitSource bits, java.lang.StringBuilder result, int count, CharacterSetECI currentCharacterSetECI, java.util.Collection<byte[]> byteSegments, java.util.Map<DecodeHintType,?> hints)
private static void	decodeHanziSegment(BitSource bits, java.lang.StringBuilder result, int count)	See specification GBT 18284-2000
private static void	decodeKanjiSegment(BitSource bits, java.lang.StringBuilder result, int count)
private static void	decodeNumericSegment(BitSource bits, java.lang.StringBuilder result, int count)
private static int	parseECIValue(BitSource bits)
private static char	toAlphaNumericChar(int value)

Methods inherited from class java.lang.Object

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

Field Detail

ALPHANUMERIC_CHARS

private static final char[] ALPHANUMERIC_CHARS

See ISO 18004:2006, 6.4.4 Table 5

GB2312_SUBSET

private static final int GB2312_SUBSET

See Also:

Constant Field Values

Constructor Detail

DecodedBitStreamParser

private DecodedBitStreamParser()

Method Detail

decode

static DecoderResult decode(byte[] bytes,
                            Version version,
                            ErrorCorrectionLevel ecLevel,
                            java.util.Map<DecodeHintType,?> hints)
                     throws FormatException

Throws:

FormatException

decodeHanziSegment

private static void decodeHanziSegment(BitSource bits,
                                       java.lang.StringBuilder result,
                                       int count)
                                throws FormatException

See specification GBT 18284-2000

Throws:

FormatException

decodeKanjiSegment

private static void decodeKanjiSegment(BitSource bits,
                                       java.lang.StringBuilder result,
                                       int count)
                                throws FormatException

Throws:

FormatException

decodeByteSegment

private static void decodeByteSegment(BitSource bits,
                                      java.lang.StringBuilder result,
                                      int count,
                                      CharacterSetECI currentCharacterSetECI,
                                      java.util.Collection<byte[]> byteSegments,
                                      java.util.Map<DecodeHintType,?> hints)
                               throws FormatException

Throws:

FormatException

toAlphaNumericChar

private static char toAlphaNumericChar(int value)
                                throws FormatException

Throws:

FormatException

decodeAlphanumericSegment

private static void decodeAlphanumericSegment(BitSource bits,
                                              java.lang.StringBuilder result,
                                              int count,
                                              boolean fc1InEffect)
                                       throws FormatException

Throws:

FormatException

decodeNumericSegment

private static void decodeNumericSegment(BitSource bits,
                                         java.lang.StringBuilder result,
                                         int count)
                                  throws FormatException

Throws:

FormatException

parseECIValue

private static int parseECIValue(BitSource bits)
                          throws FormatException

Throws:

FormatException