mirror of
https://github.com/zxing/zxing.git
synced 2025-01-13 04:07:27 -08:00
7616c4d06d
git-svn-id: https://zxing.googlecode.com/svn/trunk@2558 59b500cc-1b3d-0410-9834-0bbf25fbcc57
407 lines
14 KiB
C#
Executable file
407 lines
14 KiB
C#
Executable file
using System;
|
|
using System.Collections;
|
|
using System.Collections.Generic;
|
|
using System.Text;
|
|
|
|
/*
|
|
* Copyright 2008 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.
|
|
*/
|
|
|
|
namespace com.google.zxing.oned
|
|
{
|
|
|
|
using BarcodeFormat = com.google.zxing.BarcodeFormat;
|
|
using ChecksumException = com.google.zxing.ChecksumException;
|
|
using DecodeHintType = com.google.zxing.DecodeHintType;
|
|
using FormatException = com.google.zxing.FormatException;
|
|
using NotFoundException = com.google.zxing.NotFoundException;
|
|
using Result = com.google.zxing.Result;
|
|
using ResultPoint = com.google.zxing.ResultPoint;
|
|
using BitArray = com.google.zxing.common.BitArray;
|
|
|
|
|
|
/// <summary>
|
|
/// <p>Decodes Code 128 barcodes.</p>
|
|
///
|
|
/// @author Sean Owen
|
|
/// </summary>
|
|
public sealed class Code128Reader : OneDReader
|
|
{
|
|
|
|
internal static readonly int[][] CODE_PATTERNS = {new int[] {2, 1, 2, 2, 2, 2}, new int[] {2, 2, 2, 1, 2, 2}, new int[] {2, 2, 2, 2, 2, 1}, new int[] {1, 2, 1, 2, 2, 3}, new int[] {1, 2, 1, 3, 2, 2}, new int[] {1, 3, 1, 2, 2, 2}, new int[] {1, 2, 2, 2, 1, 3}, new int[] {1, 2, 2, 3, 1, 2}, new int[] {1, 3, 2, 2, 1, 2}, new int[] {2, 2, 1, 2, 1, 3}, new int[] {2, 2, 1, 3, 1, 2}, new int[] {2, 3, 1, 2, 1, 2}, new int[] {1, 1, 2, 2, 3, 2}, new int[] {1, 2, 2, 1, 3, 2}, new int[] {1, 2, 2, 2, 3, 1}, new int[] {1, 1, 3, 2, 2, 2}, new int[] {1, 2, 3, 1, 2, 2}, new int[] {1, 2, 3, 2, 2, 1}, new int[] {2, 2, 3, 2, 1, 1}, new int[] {2, 2, 1, 1, 3, 2}, new int[] {2, 2, 1, 2, 3, 1}, new int[] {2, 1, 3, 2, 1, 2}, new int[] {2, 2, 3, 1, 1, 2}, new int[] {3, 1, 2, 1, 3, 1}, new int[] {3, 1, 1, 2, 2, 2}, new int[] {3, 2, 1, 1, 2, 2}, new int[] {3, 2, 1, 2, 2, 1}, new int[] {3, 1, 2, 2, 1, 2}, new int[] {3, 2, 2, 1, 1, 2}, new int[] {3, 2, 2, 2, 1, 1}, new int[] {2, 1, 2, 1, 2, 3}, new int[] {2, 1, 2, 3, 2, 1}, new int[] {2, 3, 2, 1, 2, 1}, new int[] {1, 1, 1, 3, 2, 3}, new int[] {1, 3, 1, 1, 2, 3}, new int[] {1, 3, 1, 3, 2, 1}, new int[] {1, 1, 2, 3, 1, 3}, new int[] {1, 3, 2, 1, 1, 3}, new int[] {1, 3, 2, 3, 1, 1}, new int[] {2, 1, 1, 3, 1, 3}, new int[] {2, 3, 1, 1, 1, 3}, new int[] {2, 3, 1, 3, 1, 1}, new int[] {1, 1, 2, 1, 3, 3}, new int[] {1, 1, 2, 3, 3, 1}, new int[] {1, 3, 2, 1, 3, 1}, new int[] {1, 1, 3, 1, 2, 3}, new int[] {1, 1, 3, 3, 2, 1}, new int[] {1, 3, 3, 1, 2, 1}, new int[] {3, 1, 3, 1, 2, 1}, new int[] {2, 1, 1, 3, 3, 1}, new int[] {2, 3, 1, 1, 3, 1}, new int[] {2, 1, 3, 1, 1, 3}, new int[] {2, 1, 3, 3, 1, 1}, new int[] {2, 1, 3, 1, 3, 1}, new int[] {3, 1, 1, 1, 2, 3}, new int[] {3, 1, 1, 3, 2, 1}, new int[] {3, 3, 1, 1, 2, 1}, new int[] {3, 1, 2, 1, 1, 3}, new int[] {3, 1, 2, 3, 1, 1}, new int[] {3, 3, 2, 1, 1, 1}, new int[] {3, 1, 4, 1, 1, 1}, new int[] {2, 2, 1, 4, 1, 1}, new int[] {4, 3, 1, 1, 1, 1}, new int[] {1, 1, 1, 2, 2, 4}, new int[] {1, 1, 1, 4, 2, 2}, new int[] {1, 2, 1, 1, 2, 4}, new int[] {1, 2, 1, 4, 2, 1}, new int[] {1, 4, 1, 1, 2, 2}, new int[] {1, 4, 1, 2, 2, 1}, new int[] {1, 1, 2, 2, 1, 4}, new int[] {1, 1, 2, 4, 1, 2}, new int[] {1, 2, 2, 1, 1, 4}, new int[] {1, 2, 2, 4, 1, 1}, new int[] {1, 4, 2, 1, 1, 2}, new int[] {1, 4, 2, 2, 1, 1}, new int[] {2, 4, 1, 2, 1, 1}, new int[] {2, 2, 1, 1, 1, 4}, new int[] {4, 1, 3, 1, 1, 1}, new int[] {2, 4, 1, 1, 1, 2}, new int[] {1, 3, 4, 1, 1, 1}, new int[] {1, 1, 1, 2, 4, 2}, new int[] {1, 2, 1, 1, 4, 2}, new int[] {1, 2, 1, 2, 4, 1}, new int[] {1, 1, 4, 2, 1, 2}, new int[] {1, 2, 4, 1, 1, 2}, new int[] {1, 2, 4, 2, 1, 1}, new int[] {4, 1, 1, 2, 1, 2}, new int[] {4, 2, 1, 1, 1, 2}, new int[] {4, 2, 1, 2, 1, 1}, new int[] {2, 1, 2, 1, 4, 1}, new int[] {2, 1, 4, 1, 2, 1}, new int[] {4, 1, 2, 1, 2, 1}, new int[] {1, 1, 1, 1, 4, 3}, new int[] {1, 1, 1, 3, 4, 1}, new int[] {1, 3, 1, 1, 4, 1}, new int[] {1, 1, 4, 1, 1, 3}, new int[] {1, 1, 4, 3, 1, 1}, new int[] {4, 1, 1, 1, 1, 3}, new int[] {4, 1, 1, 3, 1, 1}, new int[] {1, 1, 3, 1, 4, 1}, new int[] {1, 1, 4, 1, 3, 1}, new int[] {3, 1, 1, 1, 4, 1}, new int[] {4, 1, 1, 1, 3, 1}, new int[] {2, 1, 1, 4, 1, 2}, new int[] {2, 1, 1, 2, 1, 4}, new int[] {2, 1, 1, 2, 3, 2}, new int[] {2, 3, 3, 1, 1, 1, 2}};
|
|
|
|
private static readonly int MAX_AVG_VARIANCE = (int)(PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.25f);
|
|
private static readonly int MAX_INDIVIDUAL_VARIANCE = (int)(PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.7f);
|
|
|
|
private const int CODE_SHIFT = 98;
|
|
|
|
private const int CODE_CODE_C = 99;
|
|
private const int CODE_CODE_B = 100;
|
|
private const int CODE_CODE_A = 101;
|
|
|
|
private const int CODE_FNC_1 = 102;
|
|
private const int CODE_FNC_2 = 97;
|
|
private const int CODE_FNC_3 = 96;
|
|
private const int CODE_FNC_4_A = 101;
|
|
private const int CODE_FNC_4_B = 100;
|
|
|
|
private const int CODE_START_A = 103;
|
|
private const int CODE_START_B = 104;
|
|
private const int CODE_START_C = 105;
|
|
private const int CODE_STOP = 106;
|
|
|
|
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
|
|
//ORIGINAL LINE: private static int[] findStartPattern(com.google.zxing.common.BitArray row) throws com.google.zxing.NotFoundException
|
|
private static int[] findStartPattern(BitArray row)
|
|
{
|
|
int width = row.Size;
|
|
int rowOffset = row.getNextSet(0);
|
|
|
|
int counterPosition = 0;
|
|
int[] counters = new int[6];
|
|
int patternStart = rowOffset;
|
|
bool isWhite = false;
|
|
int patternLength = counters.Length;
|
|
|
|
for (int i = rowOffset; i < width; i++)
|
|
{
|
|
if (row.get(i) ^ isWhite)
|
|
{
|
|
counters[counterPosition]++;
|
|
}
|
|
else
|
|
{
|
|
if (counterPosition == patternLength - 1)
|
|
{
|
|
int bestVariance = MAX_AVG_VARIANCE;
|
|
int bestMatch = -1;
|
|
for (int startCode = CODE_START_A; startCode <= CODE_START_C; startCode++)
|
|
{
|
|
int variance = patternMatchVariance(counters, CODE_PATTERNS[startCode], MAX_INDIVIDUAL_VARIANCE);
|
|
if (variance < bestVariance)
|
|
{
|
|
bestVariance = variance;
|
|
bestMatch = startCode;
|
|
}
|
|
}
|
|
// Look for whitespace before start pattern, >= 50% of width of start pattern
|
|
if (bestMatch >= 0 && row.isRange(Math.Max(0, patternStart - (i - patternStart) / 2), patternStart, false))
|
|
{
|
|
return new int[]{patternStart, i, bestMatch};
|
|
}
|
|
patternStart += counters[0] + counters[1];
|
|
Array.Copy(counters, 2, counters, 0, patternLength - 2);
|
|
counters[patternLength - 2] = 0;
|
|
counters[patternLength - 1] = 0;
|
|
counterPosition--;
|
|
}
|
|
else
|
|
{
|
|
counterPosition++;
|
|
}
|
|
counters[counterPosition] = 1;
|
|
isWhite = !isWhite;
|
|
}
|
|
}
|
|
throw NotFoundException.NotFoundInstance;
|
|
}
|
|
|
|
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
|
|
//ORIGINAL LINE: private static int decodeCode(com.google.zxing.common.BitArray row, int[] counters, int rowOffset) throws com.google.zxing.NotFoundException
|
|
private static int decodeCode(BitArray row, int[] counters, int rowOffset)
|
|
{
|
|
recordPattern(row, rowOffset, counters);
|
|
int bestVariance = MAX_AVG_VARIANCE; // worst variance we'll accept
|
|
int bestMatch = -1;
|
|
for (int d = 0; d < CODE_PATTERNS.Length; d++)
|
|
{
|
|
int[] pattern = CODE_PATTERNS[d];
|
|
int variance = patternMatchVariance(counters, pattern, MAX_INDIVIDUAL_VARIANCE);
|
|
if (variance < bestVariance)
|
|
{
|
|
bestVariance = variance;
|
|
bestMatch = d;
|
|
}
|
|
}
|
|
// TODO We're overlooking the fact that the STOP pattern has 7 values, not 6.
|
|
if (bestMatch >= 0)
|
|
{
|
|
return bestMatch;
|
|
}
|
|
else
|
|
{
|
|
throw NotFoundException.NotFoundInstance;
|
|
}
|
|
}
|
|
|
|
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
|
|
//ORIGINAL LINE: public com.google.zxing.Result decodeRow(int rowNumber, com.google.zxing.common.BitArray row, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.NotFoundException, com.google.zxing.FormatException, com.google.zxing.ChecksumException
|
|
public override Result decodeRow(int rowNumber, BitArray row, IDictionary<DecodeHintType, object> hints)
|
|
{
|
|
|
|
int[] startPatternInfo = findStartPattern(row);
|
|
int startCode = startPatternInfo[2];
|
|
int codeSet;
|
|
switch (startCode)
|
|
{
|
|
case CODE_START_A:
|
|
codeSet = CODE_CODE_A;
|
|
break;
|
|
case CODE_START_B:
|
|
codeSet = CODE_CODE_B;
|
|
break;
|
|
case CODE_START_C:
|
|
codeSet = CODE_CODE_C;
|
|
break;
|
|
default:
|
|
throw FormatException.FormatInstance;
|
|
}
|
|
|
|
bool done = false;
|
|
bool isNextShifted = false;
|
|
|
|
StringBuilder result = new StringBuilder(20);
|
|
IList<sbyte> rawCodes = new List<sbyte>(20);
|
|
|
|
int lastStart = startPatternInfo[0];
|
|
int nextStart = startPatternInfo[1];
|
|
int[] counters = new int[6];
|
|
|
|
int lastCode = 0;
|
|
int code = 0;
|
|
int checksumTotal = startCode;
|
|
int multiplier = 0;
|
|
bool lastCharacterWasPrintable = true;
|
|
|
|
while (!done)
|
|
{
|
|
|
|
bool unshift = isNextShifted;
|
|
isNextShifted = false;
|
|
|
|
// Save off last code
|
|
lastCode = code;
|
|
|
|
// Decode another code from image
|
|
code = decodeCode(row, counters, nextStart);
|
|
|
|
rawCodes.Add((sbyte) code);
|
|
|
|
// Remember whether the last code was printable or not (excluding CODE_STOP)
|
|
if (code != CODE_STOP)
|
|
{
|
|
lastCharacterWasPrintable = true;
|
|
}
|
|
|
|
// Add to checksum computation (if not CODE_STOP of course)
|
|
if (code != CODE_STOP)
|
|
{
|
|
multiplier++;
|
|
checksumTotal += multiplier * code;
|
|
}
|
|
|
|
// Advance to where the next code will to start
|
|
lastStart = nextStart;
|
|
foreach (int counter in counters)
|
|
{
|
|
nextStart += counter;
|
|
}
|
|
|
|
// Take care of illegal start codes
|
|
switch (code)
|
|
{
|
|
case CODE_START_A:
|
|
case CODE_START_B:
|
|
case CODE_START_C:
|
|
throw FormatException.FormatInstance;
|
|
}
|
|
|
|
switch (codeSet)
|
|
{
|
|
|
|
case CODE_CODE_A:
|
|
if (code < 64)
|
|
{
|
|
result.Append((char)(' ' + code));
|
|
}
|
|
else if (code < 96)
|
|
{
|
|
result.Append((char)(code - 64));
|
|
}
|
|
else
|
|
{
|
|
// Don't let CODE_STOP, which always appears, affect whether whether we think the last
|
|
// code was printable or not.
|
|
if (code != CODE_STOP)
|
|
{
|
|
lastCharacterWasPrintable = false;
|
|
}
|
|
switch (code)
|
|
{
|
|
case CODE_FNC_1:
|
|
case CODE_FNC_2:
|
|
case CODE_FNC_3:
|
|
case CODE_FNC_4_A:
|
|
// do nothing?
|
|
break;
|
|
case CODE_SHIFT:
|
|
isNextShifted = true;
|
|
codeSet = CODE_CODE_B;
|
|
break;
|
|
case CODE_CODE_B:
|
|
codeSet = CODE_CODE_B;
|
|
break;
|
|
case CODE_CODE_C:
|
|
codeSet = CODE_CODE_C;
|
|
break;
|
|
case CODE_STOP:
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case CODE_CODE_B:
|
|
if (code < 96)
|
|
{
|
|
result.Append((char)(' ' + code));
|
|
}
|
|
else
|
|
{
|
|
if (code != CODE_STOP)
|
|
{
|
|
lastCharacterWasPrintable = false;
|
|
}
|
|
switch (code)
|
|
{
|
|
case CODE_FNC_1:
|
|
case CODE_FNC_2:
|
|
case CODE_FNC_3:
|
|
case CODE_FNC_4_B:
|
|
// do nothing?
|
|
break;
|
|
case CODE_SHIFT:
|
|
isNextShifted = true;
|
|
codeSet = CODE_CODE_A;
|
|
break;
|
|
case CODE_CODE_A:
|
|
codeSet = CODE_CODE_A;
|
|
break;
|
|
case CODE_CODE_C:
|
|
codeSet = CODE_CODE_C;
|
|
break;
|
|
case CODE_STOP:
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case CODE_CODE_C:
|
|
if (code < 100)
|
|
{
|
|
if (code < 10)
|
|
{
|
|
result.Append('0');
|
|
}
|
|
result.Append(code);
|
|
}
|
|
else
|
|
{
|
|
if (code != CODE_STOP)
|
|
{
|
|
lastCharacterWasPrintable = false;
|
|
}
|
|
switch (code)
|
|
{
|
|
case CODE_FNC_1:
|
|
// do nothing?
|
|
break;
|
|
case CODE_CODE_A:
|
|
codeSet = CODE_CODE_A;
|
|
break;
|
|
case CODE_CODE_B:
|
|
codeSet = CODE_CODE_B;
|
|
break;
|
|
case CODE_STOP:
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Unshift back to another code set if we were shifted
|
|
if (unshift)
|
|
{
|
|
codeSet = codeSet == CODE_CODE_A ? CODE_CODE_B : CODE_CODE_A;
|
|
}
|
|
|
|
}
|
|
|
|
// Check for ample whitespace following pattern, but, to do this we first need to remember that
|
|
// we fudged decoding CODE_STOP since it actually has 7 bars, not 6. There is a black bar left
|
|
// to read off. Would be slightly better to properly read. Here we just skip it:
|
|
nextStart = row.getNextUnset(nextStart);
|
|
if (!row.isRange(nextStart, Math.Min(row.Size, nextStart + (nextStart - lastStart) / 2), false))
|
|
{
|
|
throw NotFoundException.NotFoundInstance;
|
|
}
|
|
|
|
// Pull out from sum the value of the penultimate check code
|
|
checksumTotal -= multiplier * lastCode;
|
|
// lastCode is the checksum then:
|
|
if (checksumTotal % 103 != lastCode)
|
|
{
|
|
throw ChecksumException.ChecksumInstance;
|
|
}
|
|
|
|
// Need to pull out the check digits from string
|
|
int resultLength = result.Length;
|
|
if (resultLength == 0)
|
|
{
|
|
// false positive
|
|
throw NotFoundException.NotFoundInstance;
|
|
}
|
|
|
|
// Only bother if the result had at least one character, and if the checksum digit happened to
|
|
// be a printable character. If it was just interpreted as a control code, nothing to remove.
|
|
if (resultLength > 0 && lastCharacterWasPrintable)
|
|
{
|
|
if (codeSet == CODE_CODE_C)
|
|
{
|
|
result.Remove(resultLength - 2, 2);
|
|
}
|
|
else
|
|
{
|
|
result.Remove(resultLength - 1, 1);
|
|
}
|
|
}
|
|
|
|
float left = (float)(startPatternInfo[1] + startPatternInfo[0]) / 2.0f;
|
|
float right = (float)(nextStart + lastStart) / 2.0f;
|
|
|
|
int rawCodesSize = rawCodes.Count;
|
|
sbyte[] rawBytes = new sbyte[rawCodesSize];
|
|
for (int i = 0; i < rawCodesSize; i++)
|
|
{
|
|
rawBytes[i] = rawCodes[i];
|
|
}
|
|
|
|
return new Result(result.ToString(), rawBytes, new ResultPoint[]{new ResultPoint(left, (float) rowNumber), new ResultPoint(right, (float) rowNumber)}, BarcodeFormat.CODE_128);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} |