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Issue 849, adjusted fix to Code128Writer
git-svn-id: https://zxing.googlecode.com/svn/trunk@1803 59b500cc-1b3d-0410-9834-0bbf25fbcc57
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srowen
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@ -16,7 +16,10 @@
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package com.google.zxing.oned;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.Vector;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.WriterException;
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import com.google.zxing.common.BitMatrix;
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@ -28,85 +31,131 @@ import com.google.zxing.common.BitMatrix;
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*/
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public final class Code128Writer extends UPCEANWriter {
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public BitMatrix encode(String contents,
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BarcodeFormat format,
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int width,
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int height,
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Hashtable hints) throws WriterException {
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if (format != BarcodeFormat.CODE_128) {
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throw new IllegalArgumentException("Can only encode CODE_128, but got " + format);
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}
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return super.encode(contents, format, width, height, hints);
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private static final int CODE_START_B = 104;
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private static final int CODE_START_C = 105;
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private static final int CODE_CODE_B = 100;
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private static final int CODE_CODE_C = 99;
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private static final int CODE_STOP = 106;
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public BitMatrix encode(String contents,
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BarcodeFormat format,
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int width,
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int height,
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Hashtable hints) throws WriterException {
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if (format != BarcodeFormat.CODE_128) {
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throw new IllegalArgumentException("Can only encode CODE_128, but got " + format);
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}
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return super.encode(contents, format, width, height, hints);
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}
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public byte[] encode(String contents) {
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int length = contents.length();
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if (length > 80) {
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throw new IllegalArgumentException(
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"Requested contents should be less than 80 digits long, but got " + length);
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public byte[] encode(String contents) {
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int length = contents.length();
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// Check length
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if (length < 1 || length > 80) {
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throw new IllegalArgumentException(
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"Contents length should be between 1 and 80 characters, but got " + length);
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}
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// Check content
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for (int i = 0; i < length; i++) {
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char c = contents.charAt(i);
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if (c < ' ' || c > '~') {
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throw new IllegalArgumentException("Contents should only contain characters between ' ' and '~'");
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}
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}
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Vector patterns = new Vector(); // temporary storage for patterns
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int checkSum = 0;
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int checkWeight = 1;
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int codeSet = 0; // selected code (CODE_CODE_B or CODE_CODE_C)
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int position = 0; // position in contents
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while (position < length) {
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//Select code to use
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int requiredDigitCount = codeSet == CODE_CODE_C ? 2 : 4;
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int newCodeSet;
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if (length - position >= requiredDigitCount && isDigits(contents, position, requiredDigitCount)) {
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newCodeSet = CODE_CODE_C;
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} else {
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newCodeSet = CODE_CODE_B;
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}
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//Determine which code we should use (C or B)
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boolean useCodeC = true;
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for (int i = 0; i < length; i++) {
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char c = contents.charAt(i);
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if (c < '0' || c > '9') {
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useCodeC = false;
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break;
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}
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}
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int codeWidth = 11 + 11 + 13; //start plus check plus stop character
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byte[] result;
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int pos;
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int check;
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if (useCodeC) {
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//Optionnaly add "0" to have pairs
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if (length % 2 != 0) {
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contents = '0' + contents;
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length++;
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}
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//get total code width for this barcode
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for (int i = 0; i < length; i += 2){
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int[] patterns = Code128Reader.CODE_PATTERNS[Integer.parseInt(contents.substring(i, i + 2))];
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for (int j = 0; j < patterns.length; j++) {
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codeWidth += patterns[j];
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}
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}
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result = new byte[codeWidth];
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pos = appendPattern(result, 0, Code128Reader.CODE_PATTERNS[105], 1);
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check = 105;
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//append next character to bytematrix
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for (int i = 0; i < length; i += 2) {
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int pair = Integer.parseInt(contents.substring(i, i + 2));
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check += pair * (i / 2 + 1);
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pos += appendPattern(result, pos, Code128Reader.CODE_PATTERNS[pair],1);
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//Get the pattern index
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int patternIndex;
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if (newCodeSet == codeSet) {
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// Encode the current character
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if (codeSet == CODE_CODE_B) {
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patternIndex = contents.charAt(position) - ' ';
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position += 1;
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} else { // CODE_CODE_C
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patternIndex = Integer.parseInt(contents.substring(position, position + 2));
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position += 2;
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}
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} else {
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//get total code width for this barcode
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for (int i = 0; i < length; i++) {
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int[] patterns = Code128Reader.CODE_PATTERNS[contents.charAt(i) - ' '];
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for (int j = 0; j < patterns.length; j++) {
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codeWidth += patterns[j];
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// Should we change the current code?
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// Do we have a code set?
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if (codeSet == 0) {
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// No, we don't have a code set
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if (newCodeSet == CODE_CODE_B) {
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patternIndex = CODE_START_B;
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} else {
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// CODE_CODE_C
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patternIndex = CODE_START_C;
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}
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} else {
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// Yes, we have a code set
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patternIndex = newCodeSet;
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}
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result = new byte[codeWidth];
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pos = appendPattern(result, 0, Code128Reader.CODE_PATTERNS[104], 1);
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check = 104;
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//append next character to bytematrix
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for (int i = 0; i < length; i++) {
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check += (contents.charAt(i) - ' ') * (i + 1);
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pos += appendPattern(result, pos, Code128Reader.CODE_PATTERNS[contents.charAt(i) - ' '],1);
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}
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codeSet = newCodeSet;
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}
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//compute checksum and append it along with end character and quiet space
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check %= 103;
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pos += appendPattern(result,pos,Code128Reader.CODE_PATTERNS[check],1);
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pos += appendPattern(result,pos,Code128Reader.CODE_PATTERNS[106],1);
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return result;
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// Get the pattern
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patterns.addElement(Code128Reader.CODE_PATTERNS[patternIndex]);
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// Compute checksum
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checkSum += patternIndex * checkWeight;
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if (position != 0) {
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checkWeight++;
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}
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}
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// Compute and append checksum
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checkSum %= 103;
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patterns.addElement(Code128Reader.CODE_PATTERNS[checkSum]);
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// Append stop code
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patterns.addElement(Code128Reader.CODE_PATTERNS[CODE_STOP]);
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// Compute code width
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int codeWidth = 0;
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Enumeration patternEnumeration = patterns.elements();
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while (patternEnumeration.hasMoreElements()) {
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int[] pattern = (int[]) patternEnumeration.nextElement();
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for (int i = 0; i < pattern.length; i++) {
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codeWidth += pattern[i];
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}
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}
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// Compute result
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byte[] result = new byte[codeWidth];
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patternEnumeration = patterns.elements();
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int pos = 0;
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while (patternEnumeration.hasMoreElements()) {
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int[] pattern = (int[]) patternEnumeration.nextElement();
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pos += appendPattern(result, pos, pattern, 1);
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}
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return result;
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}
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private static boolean isDigits(String value, int start, int length) {
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int end = start + length;
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for (int i = start; i < end; i++) {
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char c = value.charAt(i);
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if (c < '0' || c > '9') {
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return false;
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}
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}
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return true;
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}
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}
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