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Added a Code 93 encoder

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mmagician committed Oct 18, 2015
1 parent 2e5e2ea commit 9cf93792d429ab397e5d52a9482b9f3308dd1de7
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@@ -77,6 +77,7 @@ Luka Finžgar
Malte Starostik
Manuel Kasten
Marcelo
Marcin Górny
Markus Helm
Mateusz Jędrasik
Matthew Schulkind (Google)
@@ -22,6 +22,7 @@
import com.google.zxing.oned.CodaBarWriter;
import com.google.zxing.oned.Code128Writer;
import com.google.zxing.oned.Code39Writer;
import com.google.zxing.oned.Code93Writer;
import com.google.zxing.oned.EAN13Writer;
import com.google.zxing.oned.EAN8Writer;
import com.google.zxing.oned.ITFWriter;
@@ -74,6 +75,9 @@ public BitMatrix encode(String contents,
case CODE_39:
writer = new Code39Writer();
break;
case CODE_93:
writer = new Code93Writer();
break;
case CODE_128:
writer = new Code128Writer();
break;
@@ -37,14 +37,14 @@
public final class Code93Reader extends OneDReader {
// Note that 'abcd' are dummy characters in place of control characters.
private static final String ALPHABET_STRING = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd*";

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@estelle11976
@estelle11976
static final String ALPHABET_STRING = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd*";
private static final char[] ALPHABET = ALPHABET_STRING.toCharArray();
/**
* These represent the encodings of characters, as patterns of wide and narrow bars.
* The 9 least-significant bits of each int correspond to the pattern of wide and narrow.
*/
private static final int[] CHARACTER_ENCODINGS = {
static final int[] CHARACTER_ENCODINGS = {
0x114, 0x148, 0x144, 0x142, 0x128, 0x124, 0x122, 0x150, 0x112, 0x10A, // 0-9
0x1A8, 0x1A4, 0x1A2, 0x194, 0x192, 0x18A, 0x168, 0x164, 0x162, 0x134, // A-J
0x11A, 0x158, 0x14C, 0x146, 0x12C, 0x116, 0x1B4, 0x1B2, 0x1AC, 0x1A6, // K-T
@@ -0,0 +1,115 @@
/*
* Copyright 2015 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 com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import java.util.Map;
/**
* This object renders a CODE93 code as a BitMatrix
*/
public class Code93Writer extends OneDimensionalCodeWriter {
@Override
public BitMatrix encode(String contents,
BarcodeFormat format,
int width,
int height,
Map<EncodeHintType,?> hints) throws WriterException {
if (format != BarcodeFormat.CODE_93) {
throw new IllegalArgumentException("Can only encode CODE_93, but got " + format);
}
return super.encode(contents, format, width, height, hints);
}
@Override
public boolean[] 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);
}
//each character is encoded by 9 of 0/1's
int[] widths = new int[9];
//lenght of code + 2 start/stop characters + 2 checksums, each of 9 bits, plus a termination bar
int codeWidth = (contents.length() + 2 + 2) * 9 + 1;
boolean[] result = new boolean[codeWidth];
//start character (*)
toIntArray(Code93Reader.CHARACTER_ENCODINGS[47], widths);
int pos = appendPattern(result, 0, widths, true);
for (int i = 0; i < length; i++) {
int indexInString = Code93Reader.ALPHABET_STRING.indexOf(contents.charAt(i));
toIntArray(Code93Reader.CHARACTER_ENCODINGS[indexInString], widths);
pos += appendPattern(result, pos, widths, true);
}
//add two checksums
int check1 = computeChecksumIndex(contents, 20);
toIntArray(Code93Reader.CHARACTER_ENCODINGS[check1], widths);
pos += appendPattern(result, pos, widths, true);
//append the contents to reflect the first checksum added
contents += Code93Reader.ALPHABET_STRING.charAt(check1);
int check2 = computeChecksumIndex(contents, 15);
toIntArray(Code93Reader.CHARACTER_ENCODINGS[check2], widths);
pos += appendPattern(result, pos, widths, true);
//end character (*)
toIntArray(Code93Reader.CHARACTER_ENCODINGS[47], widths);
pos += appendPattern(result, pos, widths, true);
//termination bar (single black bar)
result[pos] = true;
return result;
}
private static void toIntArray(int a, int[] toReturn) {
for (int i = 0; i < 9; i++) {
int temp = a & (1 << (8 - i));
toReturn[i] = temp == 0 ? 0 : 1;
}
}
protected static int appendPattern(boolean[] target, int pos, int[] pattern, boolean startColor) {
for (int bit : pattern) {
target[pos++] = bit != 0;
}
return 9;
}
private static int computeChecksumIndex(String contents, int maxWeight) {
int weight = 1;
int total = 0;
for (int i = contents.length() - 1; i >= 0; i--) {
int indexInString = Code93Reader.ALPHABET_STRING.indexOf(contents.charAt(i));
total += indexInString * weight;
if (++weight > maxWeight) {
weight = 1;
}
}
return total % 47;
}

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