/*
* Copyright 2010 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.oned;
import java.util.Hashtable;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
/**
* This object renders a CODE128 code as a {@link BitMatrix}.
*
* @author erik.barbara@gmail.com (Erik Barbara)
*/
public final class Code128Writer extends UPCEANWriter {
public BitMatrix encode(String contents,
BarcodeFormat format,
int width,
int height,
Hashtable hints) throws WriterException {
if (format != BarcodeFormat.CODE_128) {
throw new IllegalArgumentException("Can only encode CODE_128, but got " + format);
}
return super.encode(contents, format, width, height, hints);
}
public byte[] encode(String contents) {
int length = contents.length();
if (length > 80) {
throw new IllegalArgumentException(
"Requested contents should be less than 80 digits long, but got " + length);
}
int codeWidth = 11 + 11 + 13; //start plus check plus stop character
//get total code width for this barcode
for (int i = 0; i < length; i++) {
int[] patterns = Code128Reader.CODE_PATTERNS[contents.charAt(i) - ' '];
for (int j = 0; j < patterns.length; j++) {
codeWidth += patterns[j];
}
}
byte[] result = new byte[codeWidth];
int pos = appendPattern(result, 0, Code128Reader.CODE_PATTERNS[104], 1);
int check = 104;
//append next character to bytematrix
for(int i = 0; i < length; i++) {
check += (contents.charAt(i) - ' ') * (i + 1);
pos += appendPattern(result, pos, Code128Reader.CODE_PATTERNS[contents.charAt(i) - ' '],1);
}
//compute checksum and append it along with end character and quiet space
check %= 103;
pos += appendPattern(result,pos,Code128Reader.CODE_PATTERNS[check],1);
pos += appendPattern(result,pos,Code128Reader.CODE_PATTERNS[106],1);
return result;
}
}
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