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/*
* 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.
*/
using System;
using System.Collections.Generic;
using System.Text;
using ZXing.Common;
namespace ZXing.Datamatrix.Internal
{
/// <summary>
/// <p>Data Matrix Codes can encode text as bits in one of several modes, and can use multiple modes
/// in one Data Matrix Code. This class decodes the bits back into text.</p>
///
/// <p>See ISO 16022:2006, 5.2.1 - 5.2.9.2</p>
///
/// <author>bbrown@google.com (Brian Brown)</author>
/// <author>Sean Owen</author>
/// </summary>
internal static class DecodedBitStreamParser
{
private enum Mode
{
PAD_ENCODE, // Not really a mode
ASCII_ENCODE,
C40_ENCODE,
TEXT_ENCODE,
ANSIX12_ENCODE,
EDIFACT_ENCODE,
BASE256_ENCODE
}
/// <summary>
/// See ISO 16022:2006, Annex C Table C.1
/// The C40 Basic Character Set (*'s used for placeholders for the shift values)
/// </summary>
private static readonly char[] C40_BASIC_SET_CHARS =
{
'*', '*', '*', ' ', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
};
private static readonly char[] C40_SHIFT2_SET_CHARS =
{
'!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.',
'/', ':', ';', '<', '=', '>', '?', '@', '[', '\\', ']', '^', '_'
};
/// <summary>
/// See ISO 16022:2006, Annex C Table C.2
/// The Text Basic Character Set (*'s used for placeholders for the shift values)
/// </summary>
private static readonly char[] TEXT_BASIC_SET_CHARS =
{
'*', '*', '*', ' ', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
};
// Shift 2 for Text is the same encoding as C40
private static readonly char[] TEXT_SHIFT2_SET_CHARS = C40_SHIFT2_SET_CHARS;
private static readonly char[] TEXT_SHIFT3_SET_CHARS =
{
'`', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '{',
'|', '}', '~', (char) 127
};
internal static DecoderResult decode(byte[] bytes)
{
BitSource bits = new BitSource(bytes);
StringBuilder result = new StringBuilder(100);
StringBuilder resultTrailer = new StringBuilder(0);
List<byte[]> byteSegments = new List<byte[]>(1);
Mode mode = Mode.ASCII_ENCODE;
do
{
if (mode == Mode.ASCII_ENCODE)
{
if (!decodeAsciiSegment(bits, result, resultTrailer, out mode))
return null;
}
else
{
switch (mode)
{
case Mode.C40_ENCODE:
if (!decodeC40Segment(bits, result))
return null;
break;
case Mode.TEXT_ENCODE:
if (!decodeTextSegment(bits, result))
return null;
break;
case Mode.ANSIX12_ENCODE:
if (!decodeAnsiX12Segment(bits, result))
return null;
break;
case Mode.EDIFACT_ENCODE:
if (!decodeEdifactSegment(bits, result))
return null;
break;
case Mode.BASE256_ENCODE:
if (!decodeBase256Segment(bits, result, byteSegments))
return null;
break;
default:
return null;
}
mode = Mode.ASCII_ENCODE;
}
} while (mode != Mode.PAD_ENCODE && bits.available() > 0);
if (resultTrailer.Length > 0)
{
result.Append(resultTrailer.ToString());
}
return new DecoderResult(bytes, result.ToString(), byteSegments.Count == 0 ? null : byteSegments, null);
}
/// <summary>
/// See ISO 16022:2006, 5.2.3 and Annex C, Table C.2
/// </summary>
private static bool decodeAsciiSegment(BitSource bits,
StringBuilder result,
StringBuilder resultTrailer,
out Mode mode)
{
bool upperShift = false;
mode = Mode.ASCII_ENCODE;
do
{
int oneByte = bits.readBits(8);
if (oneByte == 0)
{
return false;
}
else if (oneByte <= 128)
{
// ASCII data (ASCII value + 1)
if (upperShift)
{
oneByte += 128;
//upperShift = false;
}
result.Append((char) (oneByte - 1));
mode = Mode.ASCII_ENCODE;
return true;
}
else if (oneByte == 129)
{
// Pad
mode = Mode.PAD_ENCODE;
return true;
}
else if (oneByte <= 229)
{
// 2-digit data 00-99 (Numeric Value + 130)
int value = oneByte - 130;
if (value < 10)
{
// pad with '0' for single digit values
result.Append('0');
}
result.Append(value);
}
else if (oneByte == 230)
{
// Latch to C40 encodation
mode = Mode.C40_ENCODE;
return true;
}
else if (oneByte == 231)
{
// Latch to Base 256 encodation
mode = Mode.BASE256_ENCODE;
return true;
}
else if (oneByte == 232)
{
// FNC1
result.Append((char) 29); // translate as ASCII 29
}
else if (oneByte == 233 || oneByte == 234)
{
// Structured Append, Reader Programming
// Ignore these symbols for now
//throw ReaderException.Instance;
}
else if (oneByte == 235)
{
// Upper Shift (shift to Extended ASCII)
upperShift = true;
}
else if (oneByte == 236)
{
// 05 Macro
result.Append("[)>\u001E05\u001D");
resultTrailer.Insert(0, "\u001E\u0004");
}
else if (oneByte == 237)
{
// 06 Macro
result.Append("[)>\u001E06\u001D");
resultTrailer.Insert(0, "\u001E\u0004");
}
else if (oneByte == 238)
{
// Latch to ANSI X12 encodation
mode = Mode.ANSIX12_ENCODE;
return true;
}
else if (oneByte == 239)
{
// Latch to Text encodation
mode = Mode.TEXT_ENCODE;
return true;
}
else if (oneByte == 240)
{
// Latch to EDIFACT encodation
mode = Mode.EDIFACT_ENCODE;
return true;
}
else if (oneByte == 241)
{
// ECI Character
// TODO(bbrown): I think we need to support ECI
//throw ReaderException.Instance;
// Ignore this symbol for now
}
else if (oneByte >= 242)
{
// Not to be used in ASCII encodation
// ... but work around encoders that end with 254, latch back to ASCII
if (oneByte != 254 || bits.available() != 0)
{
return false;
}
}
} while (bits.available() > 0);
mode = Mode.ASCII_ENCODE;
return true;
}
/// <summary>
/// See ISO 16022:2006, 5.2.5 and Annex C, Table C.1
/// </summary>
private static bool decodeC40Segment(BitSource bits, StringBuilder result)
{
// Three C40 values are encoded in a 16-bit value as
// (1600 * C1) + (40 * C2) + C3 + 1
// TODO(bbrown): The Upper Shift with C40 doesn't work in the 4 value scenario all the time
bool upperShift = false;
int[] cValues = new int[3];
int shift = 0;
do
{
// If there is only one byte left then it will be encoded as ASCII
if (bits.available() == 8)
{
return true;
}
int firstByte = bits.readBits(8);
if (firstByte == 254)
{
// Unlatch codeword
return true;
}
parseTwoBytes(firstByte, bits.readBits(8), cValues);
for (int i = 0; i < 3; i++)
{
int cValue = cValues[i];
switch (shift)
{
case 0:
if (cValue < 3)
{
shift = cValue + 1;
}
else if (cValue < C40_BASIC_SET_CHARS.Length)
{
char c40char = C40_BASIC_SET_CHARS[cValue];
if (upperShift)
{
result.Append((char) (c40char + 128));
upperShift = false;
}
else
{
result.Append(c40char);
}
}
else
{
return false;
}
break;
case 1:
if (upperShift)
{
result.Append((char) (cValue + 128));
upperShift = false;
}
else
{
result.Append((char) cValue);
}
shift = 0;
break;
case 2:
if (cValue < C40_SHIFT2_SET_CHARS.Length)
{
char c40char = C40_SHIFT2_SET_CHARS[cValue];
if (upperShift)
{
result.Append((char) (c40char + 128));
upperShift = false;
}
else
{
result.Append(c40char);
}
}
else if (cValue == 27)
{
// FNC1
result.Append((char) 29); // translate as ASCII 29
}
else if (cValue == 30)
{
// Upper Shift
upperShift = true;
}
else
{
return false;
}
shift = 0;
break;
case 3:
if (upperShift)
{
result.Append((char) (cValue + 224));
upperShift = false;
}
else
{
result.Append((char) (cValue + 96));
}
shift = 0;
break;
default:
return false;
}
}
} while (bits.available() > 0);
return true;
}
/// <summary>
/// See ISO 16022:2006, 5.2.6 and Annex C, Table C.2
/// </summary>
private static bool decodeTextSegment(BitSource bits, StringBuilder result)
{
// Three Text values are encoded in a 16-bit value as
// (1600 * C1) + (40 * C2) + C3 + 1
// TODO(bbrown): The Upper Shift with Text doesn't work in the 4 value scenario all the time
bool upperShift = false;
int[] cValues = new int[3];
int shift = 0;
do
{
// If there is only one byte left then it will be encoded as ASCII
if (bits.available() == 8)
{
return true;
}
int firstByte = bits.readBits(8);
if (firstByte == 254)
{
// Unlatch codeword
return true;
}
parseTwoBytes(firstByte, bits.readBits(8), cValues);
for (int i = 0; i < 3; i++)
{
int cValue = cValues[i];
switch (shift)
{
case 0:
if (cValue < 3)
{
shift = cValue + 1;
}
else if (cValue < TEXT_BASIC_SET_CHARS.Length)
{
char textChar = TEXT_BASIC_SET_CHARS[cValue];
if (upperShift)
{
result.Append((char) (textChar + 128));
upperShift = false;
}
else
{
result.Append(textChar);
}
}
else
{
return false;
}
break;
case 1:
if (upperShift)
{
result.Append((char) (cValue + 128));
upperShift = false;
}
else
{
result.Append((char) cValue);
}
shift = 0;
break;
case 2:
// Shift 2 for Text is the same encoding as C40
if (cValue < TEXT_SHIFT2_SET_CHARS.Length)
{
char textChar = TEXT_SHIFT2_SET_CHARS[cValue];
if (upperShift)
{
result.Append((char) (textChar + 128));
upperShift = false;
}
else
{
result.Append(textChar);
}
}
else if (cValue == 27)
{
// FNC1
result.Append((char) 29); // translate as ASCII 29
}
else if (cValue == 30)
{
// Upper Shift
upperShift = true;
}
else
{
return false;
}
shift = 0;
break;
case 3:
if (cValue < TEXT_SHIFT3_SET_CHARS.Length)
{
char textChar = TEXT_SHIFT3_SET_CHARS[cValue];
if (upperShift)
{
result.Append((char) (textChar + 128));
upperShift = false;
}
else
{
result.Append(textChar);
}
shift = 0;
}
else
{
return false;
}
break;
default:
return false;
}
}
} while (bits.available() > 0);
return true;
}
/// <summary>
/// See ISO 16022:2006, 5.2.7
/// </summary>
private static bool decodeAnsiX12Segment(BitSource bits,
StringBuilder result)
{
// Three ANSI X12 values are encoded in a 16-bit value as
// (1600 * C1) + (40 * C2) + C3 + 1
int[] cValues = new int[3];
do
{
// If there is only one byte left then it will be encoded as ASCII
if (bits.available() == 8)
{
return true;
}
int firstByte = bits.readBits(8);
if (firstByte == 254)
{
// Unlatch codeword
return true;
}
parseTwoBytes(firstByte, bits.readBits(8), cValues);
for (int i = 0; i < 3; i++)
{
int cValue = cValues[i];
if (cValue == 0)
{
// X12 segment terminator <CR>
result.Append('\r');
}
else if (cValue == 1)
{
// X12 segment separator *
result.Append('*');
}
else if (cValue == 2)
{
// X12 sub-element separator >
result.Append('>');
}
else if (cValue == 3)
{
// space
result.Append(' ');
}
else if (cValue < 14)
{
// 0 - 9
result.Append((char) (cValue + 44));
}
else if (cValue < 40)
{
// A - Z
result.Append((char) (cValue + 51));
}
else
{
return false;
}
}
} while (bits.available() > 0);
return true;
}
private static void parseTwoBytes(int firstByte, int secondByte, int[] result)
{
int fullBitValue = (firstByte << 8) + secondByte - 1;
int temp = fullBitValue/1600;
result[0] = temp;
fullBitValue -= temp*1600;
temp = fullBitValue/40;
result[1] = temp;
result[2] = fullBitValue - temp*40;
}
/// <summary>
/// See ISO 16022:2006, 5.2.8 and Annex C Table C.3
/// </summary>
private static bool decodeEdifactSegment(BitSource bits, StringBuilder result)
{
do
{
// If there is only two or less bytes left then it will be encoded as ASCII
if (bits.available() <= 16)
{
return true;
}
for (int i = 0; i < 4; i++)
{
int edifactValue = bits.readBits(6);
// Check for the unlatch character
if (edifactValue == 0x1F)
{
// 011111
// Read rest of byte, which should be 0, and stop
int bitsLeft = 8 - bits.BitOffset;
if (bitsLeft != 8)
{
bits.readBits(bitsLeft);
}
return true;
}
if ((edifactValue & 0x20) == 0)
{
// no 1 in the leading (6th) bit
edifactValue |= 0x40; // Add a leading 01 to the 6 bit binary value
}
result.Append((char) edifactValue);
}
} while (bits.available() > 0);
return true;
}
/// <summary>
/// See ISO 16022:2006, 5.2.9 and Annex B, B.2
/// </summary>
private static bool decodeBase256Segment(BitSource bits,
StringBuilder result,
IList<byte[]> byteSegments)
{
// Figure out how long the Base 256 Segment is.
int codewordPosition = 1 + bits.ByteOffset; // position is 1-indexed
int d1 = unrandomize255State(bits.readBits(8), codewordPosition++);
int count;
if (d1 == 0)
{
// Read the remainder of the symbol
count = bits.available()/8;
}
else if (d1 < 250)
{
count = d1;
}
else
{
count = 250*(d1 - 249) + unrandomize255State(bits.readBits(8), codewordPosition++);
}
// We're seeing NegativeArraySizeException errors from users.
if (count < 0)
{
return false;
}
byte[] bytes = new byte[count];
for (int i = 0; i < count; i++)
{
// Have seen this particular error in the wild, such as at
// http://www.bcgen.com/demo/IDAutomationStreamingDataMatrix.aspx?MODE=3&D=Fred&PFMT=3&PT=F&X=0.3&O=0&LM=0.2
if (bits.available() < 8)
{
return false;
}
bytes[i] = (byte) unrandomize255State(bits.readBits(8), codewordPosition++);
}
byteSegments.Add(bytes);
try
{
#if (WINDOWS_PHONE || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || WindowsCE || PORTABLE)
#if WindowsCE
result.Append(Encoding.GetEncoding(1252).GetString(bytes, 0, bytes.Length));
#else
result.Append(Encoding.GetEncoding("ISO-8859-1").GetString(bytes, 0, bytes.Length));
#endif
#else
result.Append(Encoding.GetEncoding("ISO-8859-1").GetString(bytes));
#endif
}
catch (Exception uee)
{
throw new InvalidOperationException("Platform does not support required encoding: " + uee);
}
return true;
}
/// <summary>
/// See ISO 16022:2006, Annex B, B.2
/// </summary>
private static int unrandomize255State(int randomizedBase256Codeword,
int base256CodewordPosition)
{
int pseudoRandomNumber = ((149*base256CodewordPosition)%255) + 1;
int tempVariable = randomizedBase256Codeword - pseudoRandomNumber;
return tempVariable >= 0 ? tempVariable : tempVariable + 256;
}
}
}