Package org.krysalis.barcode4j.impl.pdf417

Class PDF417ErrorCorrection

java.lang.Object

org.krysalis.barcode4j.impl.pdf417.PDF417ErrorCorrection

All Implemented Interfaces:

PDF417Constants

public class PDF417ErrorCorrection
extends Object
implements PDF417Constants

PDF417 error correction code following the algorithm described in ISO/IEC 15438:2001(E) in chapter 4.10.

Version:

$Id: PDF417ErrorCorrection.java,v 1.1 2006-06-22 09:01:16 jmaerki Exp $

Field Summary

Fields inherited from interface org.krysalis.barcode4j.impl.pdf417.PDF417Constants

BYTE_COMPACTION, CODEWORD_TABLE, CP437, DEFAULT_ENCODING, EC_COEFFICIENTS, ECI_CHARSET, ECI_GENERAL_PURPOSE, ECI_USER_DEFINED, LATCH_TO_BYTE, LATCH_TO_BYTE_PADDED, LATCH_TO_NUMERIC, LATCH_TO_TEXT, MACRO_PDF_CONTROL_BLOCK_START, MACRO_PDF_OPTIONAL_FIELD_START, MACRO_PDF_TERMINATOR, NUMERIC_COMPACTION, PAD, READER_INITIALISATION, SHIFT_TO_BYTE, START_PATTERN, STOP_PATTERN, SUBMODE_ALPHA, SUBMODE_LOWER, SUBMODE_MIXED, SUBMODE_PUNCTUATION, TEXT_COMPACTION, TEXT_MIXED_RAW, TEXT_PUNCTUATION_RAW

Constructor Summary

Constructors

Constructor	Description
PDF417ErrorCorrection()

Method Summary

Modifier and Type	Method	Description
static String	generateErrorCorrection(String dataCodewords, int errorCorrectionLevel)	Generates the error correction codewords according to 4.10 in ISO/IEC 15438:2001(E).
static int	getErrorCorrectionCodewordCount(int errorCorrectionLevel)	Determines the number of error correction codewords for a specified error correction level.
static int	getRecommendedMinimumErrorCorrectionLevel(int n)	Returns the recommended minimum error correction level as described in annex E of ISO/IEC 15438:2001(E).

Methods inherited from class java.lang.Object

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

Constructor Details

PDF417ErrorCorrection

public PDF417ErrorCorrection()

Method Details

getErrorCorrectionCodewordCount

public static int getErrorCorrectionCodewordCount(int errorCorrectionLevel)

Determines the number of error correction codewords for a specified error correction level.

Parameters:

errorCorrectionLevel - the error correction level (0-8)

Returns:

the number of codewords generated for error correction

getRecommendedMinimumErrorCorrectionLevel

public static int getRecommendedMinimumErrorCorrectionLevel(int n)

Returns the recommended minimum error correction level as described in annex E of ISO/IEC 15438:2001(E).

Parameters:

n - the number of data codewords

Returns:

the recommended minimum error correction level

generateErrorCorrection

public static String generateErrorCorrection(String dataCodewords,
 int errorCorrectionLevel)

Generates the error correction codewords according to 4.10 in ISO/IEC 15438:2001(E).

Parameters:

dataCodewords - the data codewords

errorCorrectionLevel - the error correction level (0-8)

Returns:

the String representing the error correction codewords