Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
801 lines (722 sloc) 32.4 KB
/*
* 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;
using ZXing.Common.ReedSolomon;
namespace ZXing.QrCode.Internal
{
/// <summary>
/// </summary>
/// <author>satorux@google.com (Satoru Takabayashi) - creator</author>
/// <author>dswitkin@google.com (Daniel Switkin) - ported from C++</author>
public static class Encoder
{
// The original table is defined in the table 5 of JISX0510:2004 (p.19).
private static readonly int[] ALPHANUMERIC_TABLE = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x00-0x0f
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x10-0x1f
36, -1, -1, -1, 37, 38, -1, -1, -1, -1, 39, 40, -1, 41, 42, 43, // 0x20-0x2f
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 44, -1, -1, -1, -1, -1, // 0x30-0x3f
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 0x40-0x4f
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, // 0x50-0x5f
};
internal static String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1";
// The mask penalty calculation is complicated. See Table 21 of JISX0510:2004 (p.45) for details.
// Basically it applies four rules and summate all penalties.
private static int calculateMaskPenalty(ByteMatrix matrix)
{
return MaskUtil.applyMaskPenaltyRule1(matrix)
+ MaskUtil.applyMaskPenaltyRule2(matrix)
+ MaskUtil.applyMaskPenaltyRule3(matrix)
+ MaskUtil.applyMaskPenaltyRule4(matrix);
}
/// <summary>
/// Encode "bytes" with the error correction level "ecLevel". The encoding mode will be chosen
/// internally by chooseMode(). On success, store the result in "qrCode".
/// We recommend you to use QRCode.EC_LEVEL_L (the lowest level) for
/// "getECLevel" since our primary use is to show QR code on desktop screens. We don't need very
/// strong error correction for this purpose.
/// Note that there is no way to encode bytes in MODE_KANJI. We might want to add EncodeWithMode()
/// with which clients can specify the encoding mode. For now, we don't need the functionality.
/// </summary>
/// <param name="content">text to encode</param>
/// <param name="ecLevel">error correction level to use</param>
/// <returns><see cref="QRCode"/> representing the encoded QR code</returns>
public static QRCode encode(String content, ErrorCorrectionLevel ecLevel)
{
return encode(content, ecLevel, null);
}
/// <summary>
/// Encodes the specified content.
/// </summary>
/// <param name="content">The content.</param>
/// <param name="ecLevel">The ec level.</param>
/// <param name="hints">The hints.</param>
/// <returns></returns>
public static QRCode encode(String content,
ErrorCorrectionLevel ecLevel,
IDictionary<EncodeHintType, object> hints)
{
// Determine what character encoding has been specified by the caller, if any
bool hasEncodingHint = hints != null && hints.ContainsKey(EncodeHintType.CHARACTER_SET);
#if !SILVERLIGHT || WINDOWS_PHONE
var encoding = hints == null || !hints.ContainsKey(EncodeHintType.CHARACTER_SET) ? null : (String)hints[EncodeHintType.CHARACTER_SET];
if (encoding == null)
{
encoding = DEFAULT_BYTE_MODE_ENCODING;
}
var generateECI = hasEncodingHint || !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding);
#else
// Silverlight supports only UTF-8 and UTF-16 out-of-the-box
const string encoding = "UTF-8";
// caller of the method can only control if the ECI segment should be written
// character set is fixed to UTF-8; but some scanners doesn't like the ECI segment
var generateECI = hasEncodingHint;
#endif
// Pick an encoding mode appropriate for the content. Note that this will not attempt to use
// multiple modes / segments even if that were more efficient. Twould be nice.
var mode = chooseMode(content, encoding);
// This will store the header information, like mode and
// length, as well as "header" segments like an ECI segment.
var headerBits = new BitArray();
// Append ECI segment if applicable
if (mode == Mode.BYTE && generateECI)
{
var eci = CharacterSetECI.getCharacterSetECIByName(encoding);
if (eci != null)
{
var eciIsExplicitDisabled = (hints != null && hints.ContainsKey(EncodeHintType.DISABLE_ECI) && hints[EncodeHintType.DISABLE_ECI] != null && Convert.ToBoolean(hints[EncodeHintType.DISABLE_ECI].ToString()));
if (!eciIsExplicitDisabled)
{
appendECI(eci, headerBits);
}
}
}
// Append the FNC1 mode header for GS1 formatted data if applicable
var hasGS1FormatHint = hints != null && hints.ContainsKey(EncodeHintType.GS1_FORMAT);
if (hasGS1FormatHint && hints[EncodeHintType.GS1_FORMAT] != null && Convert.ToBoolean(hints[EncodeHintType.GS1_FORMAT].ToString()))
{
// GS1 formatted codes are prefixed with a FNC1 in first position mode header
appendModeInfo(Mode.FNC1_FIRST_POSITION, headerBits);
}
// (With ECI in place,) Write the mode marker
appendModeInfo(mode, headerBits);
// Collect data within the main segment, separately, to count its size if needed. Don't add it to
// main payload yet.
var dataBits = new BitArray();
appendBytes(content, mode, dataBits, encoding);
Version version;
if (hints != null && hints.ContainsKey(EncodeHintType.QR_VERSION))
{
int versionNumber = Int32.Parse(hints[EncodeHintType.QR_VERSION].ToString());
version = Version.getVersionForNumber(versionNumber);
int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, version);
if (!willFit(bitsNeeded, version, ecLevel))
{
throw new WriterException("Data too big for requested version");
}
}
else
{
version = recommendVersion(ecLevel, mode, headerBits, dataBits);
}
var headerAndDataBits = new BitArray();
headerAndDataBits.appendBitArray(headerBits);
// Find "length" of main segment and write it
var numLetters = mode == Mode.BYTE ? dataBits.SizeInBytes : content.Length;
appendLengthInfo(numLetters, version, mode, headerAndDataBits);
// Put data together into the overall payload
headerAndDataBits.appendBitArray(dataBits);
var ecBlocks = version.getECBlocksForLevel(ecLevel);
var numDataBytes = version.TotalCodewords - ecBlocks.TotalECCodewords;
// Terminate the bits properly.
terminateBits(numDataBytes, headerAndDataBits);
// Interleave data bits with error correction code.
var finalBits = interleaveWithECBytes(headerAndDataBits,
version.TotalCodewords,
numDataBytes,
ecBlocks.NumBlocks);
var qrCode = new QRCode
{
ECLevel = ecLevel,
Mode = mode,
Version = version
};
// Choose the mask pattern and set to "qrCode".
var dimension = version.DimensionForVersion;
var matrix = new ByteMatrix(dimension, dimension);
var maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
qrCode.MaskPattern = maskPattern;
// Build the matrix and set it to "qrCode".
MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
qrCode.Matrix = matrix;
return qrCode;
}
/// <summary>
/// Decides the smallest version of QR code that will contain all of the provided data.
/// </summary>
/// <exception cref="WriterException">if the data cannot fit in any version</exception>
private static Version recommendVersion(ErrorCorrectionLevel ecLevel, Mode mode, BitArray headerBits, BitArray dataBits)
{
// Hard part: need to know version to know how many bits length takes. But need to know how many
// bits it takes to know version. First we take a guess at version by assuming version will be
// the minimum, 1:
var provisionalBitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, Version.getVersionForNumber(1));
var provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
// Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
var bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, provisionalVersion);
return chooseVersion(bitsNeeded, ecLevel);
}
private static int calculateBitsNeeded(Mode mode, BitArray headerBits, BitArray dataBits, Version version)
{
return headerBits.Size + mode.getCharacterCountBits(version) + dataBits.Size;
}
/// <summary>
/// Gets the alphanumeric code.
/// </summary>
/// <param name="code">The code.</param>
/// <returns>the code point of the table used in alphanumeric mode or
/// -1 if there is no corresponding code in the table.</returns>
internal static int getAlphanumericCode(int code)
{
if (code < ALPHANUMERIC_TABLE.Length)
{
return ALPHANUMERIC_TABLE[code];
}
return -1;
}
/// <summary>
/// Chooses the mode.
/// </summary>
/// <param name="content">The content.</param>
/// <returns></returns>
public static Mode chooseMode(String content)
{
return chooseMode(content, null);
}
/// <summary>
/// Choose the best mode by examining the content. Note that 'encoding' is used as a hint;
/// if it is Shift_JIS, and the input is only double-byte Kanji, then we return {@link Mode#KANJI}.
/// </summary>
/// <param name="content">The content.</param>
/// <param name="encoding">The encoding.</param>
/// <returns></returns>
private static Mode chooseMode(String content, String encoding)
{
if ("Shift_JIS".Equals(encoding) && isOnlyDoubleByteKanji(content))
{
// Choose Kanji mode if all input are double-byte characters
return Mode.KANJI;
}
bool hasNumeric = false;
bool hasAlphanumeric = false;
for (int i = 0; i < content.Length; ++i)
{
char c = content[i];
if (c >= '0' && c <= '9')
{
hasNumeric = true;
}
else if (getAlphanumericCode(c) != -1)
{
hasAlphanumeric = true;
}
else
{
return Mode.BYTE;
}
}
if (hasAlphanumeric)
{
return Mode.ALPHANUMERIC;
}
if (hasNumeric)
{
return Mode.NUMERIC;
}
return Mode.BYTE;
}
private static bool isOnlyDoubleByteKanji(String content)
{
byte[] bytes;
try
{
bytes = Encoding.GetEncoding("Shift_JIS").GetBytes(content);
}
catch (Exception)
{
return false;
}
int length = bytes.Length;
if (length % 2 != 0)
{
return false;
}
for (int i = 0; i < length; i += 2)
{
int byte1 = bytes[i] & 0xFF;
if ((byte1 < 0x81 || byte1 > 0x9F) && (byte1 < 0xE0 || byte1 > 0xEB))
{
return false;
}
}
return true;
}
private static int chooseMaskPattern(BitArray bits,
ErrorCorrectionLevel ecLevel,
Version version,
ByteMatrix matrix)
{
int minPenalty = Int32.MaxValue; // Lower penalty is better.
int bestMaskPattern = -1;
// We try all mask patterns to choose the best one.
for (int maskPattern = 0; maskPattern < QRCode.NUM_MASK_PATTERNS; maskPattern++)
{
MatrixUtil.buildMatrix(bits, ecLevel, version, maskPattern, matrix);
int penalty = calculateMaskPenalty(matrix);
if (penalty < minPenalty)
{
minPenalty = penalty;
bestMaskPattern = maskPattern;
}
}
return bestMaskPattern;
}
private static Version chooseVersion(int numInputBits, ErrorCorrectionLevel ecLevel)
{
for (int versionNum = 1; versionNum <= 40; versionNum++)
{
var version = Version.getVersionForNumber(versionNum);
if (willFit(numInputBits, version, ecLevel))
{
return version;
}
}
throw new WriterException("Data too big");
}
/// <summary></summary>
/// <returns>true if the number of input bits will fit in a code with the specified version and error correction level.</returns>
private static bool willFit(int numInputBits, Version version, ErrorCorrectionLevel ecLevel)
{
// In the following comments, we use numbers of Version 7-H.
// numBytes = 196
var numBytes = version.TotalCodewords;
// getNumECBytes = 130
var ecBlocks = version.getECBlocksForLevel(ecLevel);
var numEcBytes = ecBlocks.TotalECCodewords;
// getNumDataBytes = 196 - 130 = 66
var numDataBytes = numBytes - numEcBytes;
var totalInputBytes = (numInputBits + 7) / 8;
return numDataBytes >= totalInputBytes;
}
/// <summary>
/// Terminate bits as described in 8.4.8 and 8.4.9 of JISX0510:2004 (p.24).
/// </summary>
/// <param name="numDataBytes">The num data bytes.</param>
/// <param name="bits">The bits.</param>
internal static void terminateBits(int numDataBytes, BitArray bits)
{
int capacity = numDataBytes << 3;
if (bits.Size > capacity)
{
throw new WriterException("data bits cannot fit in the QR Code" + bits.Size + " > " +
capacity);
}
for (int i = 0; i < 4 && bits.Size < capacity; ++i)
{
bits.appendBit(false);
}
// Append termination bits. See 8.4.8 of JISX0510:2004 (p.24) for details.
// If the last byte isn't 8-bit aligned, we'll add padding bits.
int numBitsInLastByte = bits.Size & 0x07;
if (numBitsInLastByte > 0)
{
for (int i = numBitsInLastByte; i < 8; i++)
{
bits.appendBit(false);
}
}
// If we have more space, we'll fill the space with padding patterns defined in 8.4.9 (p.24).
int numPaddingBytes = numDataBytes - bits.SizeInBytes;
for (int i = 0; i < numPaddingBytes; ++i)
{
bits.appendBits((i & 0x01) == 0 ? 0xEC : 0x11, 8);
}
if (bits.Size != capacity)
{
throw new WriterException("Bits size does not equal capacity");
}
}
/// <summary>
/// Get number of data bytes and number of error correction bytes for block id "blockID". Store
/// the result in "numDataBytesInBlock", and "numECBytesInBlock". See table 12 in 8.5.1 of
/// JISX0510:2004 (p.30)
/// </summary>
/// <param name="numTotalBytes">The num total bytes.</param>
/// <param name="numDataBytes">The num data bytes.</param>
/// <param name="numRSBlocks">The num RS blocks.</param>
/// <param name="blockID">The block ID.</param>
/// <param name="numDataBytesInBlock">The num data bytes in block.</param>
/// <param name="numECBytesInBlock">The num EC bytes in block.</param>
internal static void getNumDataBytesAndNumECBytesForBlockID(int numTotalBytes,
int numDataBytes,
int numRSBlocks,
int blockID,
int[] numDataBytesInBlock,
int[] numECBytesInBlock)
{
if (blockID >= numRSBlocks)
{
throw new WriterException("Block ID too large");
}
// numRsBlocksInGroup2 = 196 % 5 = 1
int numRsBlocksInGroup2 = numTotalBytes % numRSBlocks;
// numRsBlocksInGroup1 = 5 - 1 = 4
int numRsBlocksInGroup1 = numRSBlocks - numRsBlocksInGroup2;
// numTotalBytesInGroup1 = 196 / 5 = 39
int numTotalBytesInGroup1 = numTotalBytes / numRSBlocks;
// numTotalBytesInGroup2 = 39 + 1 = 40
int numTotalBytesInGroup2 = numTotalBytesInGroup1 + 1;
// numDataBytesInGroup1 = 66 / 5 = 13
int numDataBytesInGroup1 = numDataBytes / numRSBlocks;
// numDataBytesInGroup2 = 13 + 1 = 14
int numDataBytesInGroup2 = numDataBytesInGroup1 + 1;
// numEcBytesInGroup1 = 39 - 13 = 26
int numEcBytesInGroup1 = numTotalBytesInGroup1 - numDataBytesInGroup1;
// numEcBytesInGroup2 = 40 - 14 = 26
int numEcBytesInGroup2 = numTotalBytesInGroup2 - numDataBytesInGroup2;
// Sanity checks.
// 26 = 26
if (numEcBytesInGroup1 != numEcBytesInGroup2)
{
throw new WriterException("EC bytes mismatch");
}
// 5 = 4 + 1.
if (numRSBlocks != numRsBlocksInGroup1 + numRsBlocksInGroup2)
{
throw new WriterException("RS blocks mismatch");
}
// 196 = (13 + 26) * 4 + (14 + 26) * 1
if (numTotalBytes !=
((numDataBytesInGroup1 + numEcBytesInGroup1) *
numRsBlocksInGroup1) +
((numDataBytesInGroup2 + numEcBytesInGroup2) *
numRsBlocksInGroup2))
{
throw new WriterException("Total bytes mismatch");
}
if (blockID < numRsBlocksInGroup1)
{
numDataBytesInBlock[0] = numDataBytesInGroup1;
numECBytesInBlock[0] = numEcBytesInGroup1;
}
else
{
numDataBytesInBlock[0] = numDataBytesInGroup2;
numECBytesInBlock[0] = numEcBytesInGroup2;
}
}
/// <summary>
/// Interleave "bits" with corresponding error correction bytes. On success, store the result in
/// "result". The interleave rule is complicated. See 8.6 of JISX0510:2004 (p.37) for details.
/// </summary>
/// <param name="bits">The bits.</param>
/// <param name="numTotalBytes">The num total bytes.</param>
/// <param name="numDataBytes">The num data bytes.</param>
/// <param name="numRSBlocks">The num RS blocks.</param>
/// <returns></returns>
internal static BitArray interleaveWithECBytes(BitArray bits,
int numTotalBytes,
int numDataBytes,
int numRSBlocks)
{
// "bits" must have "getNumDataBytes" bytes of data.
if (bits.SizeInBytes != numDataBytes)
{
throw new WriterException("Number of bits and data bytes does not match");
}
// Step 1. Divide data bytes into blocks and generate error correction bytes for them. We'll
// store the divided data bytes blocks and error correction bytes blocks into "blocks".
int dataBytesOffset = 0;
int maxNumDataBytes = 0;
int maxNumEcBytes = 0;
// Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
var blocks = new List<BlockPair>(numRSBlocks);
for (int i = 0; i < numRSBlocks; ++i)
{
int[] numDataBytesInBlock = new int[1];
int[] numEcBytesInBlock = new int[1];
getNumDataBytesAndNumECBytesForBlockID(
numTotalBytes, numDataBytes, numRSBlocks, i,
numDataBytesInBlock, numEcBytesInBlock);
int size = numDataBytesInBlock[0];
byte[] dataBytes = new byte[size];
bits.toBytes(8 * dataBytesOffset, dataBytes, 0, size);
byte[] ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
blocks.Add(new BlockPair(dataBytes, ecBytes));
maxNumDataBytes = Math.Max(maxNumDataBytes, size);
maxNumEcBytes = Math.Max(maxNumEcBytes, ecBytes.Length);
dataBytesOffset += numDataBytesInBlock[0];
}
if (numDataBytes != dataBytesOffset)
{
throw new WriterException("Data bytes does not match offset");
}
BitArray result = new BitArray();
// First, place data blocks.
for (int i = 0; i < maxNumDataBytes; ++i)
{
foreach (BlockPair block in blocks)
{
byte[] dataBytes = block.DataBytes;
if (i < dataBytes.Length)
{
result.appendBits(dataBytes[i], 8);
}
}
}
// Then, place error correction blocks.
for (int i = 0; i < maxNumEcBytes; ++i)
{
foreach (BlockPair block in blocks)
{
byte[] ecBytes = block.ErrorCorrectionBytes;
if (i < ecBytes.Length)
{
result.appendBits(ecBytes[i], 8);
}
}
}
if (numTotalBytes != result.SizeInBytes)
{ // Should be same.
throw new WriterException("Interleaving error: " + numTotalBytes + " and " +
result.SizeInBytes + " differ.");
}
return result;
}
internal static byte[] generateECBytes(byte[] dataBytes, int numEcBytesInBlock)
{
int numDataBytes = dataBytes.Length;
int[] toEncode = new int[numDataBytes + numEcBytesInBlock];
for (int i = 0; i < numDataBytes; i++)
{
toEncode[i] = dataBytes[i] & 0xFF;
}
new ReedSolomonEncoder(GenericGF.QR_CODE_FIELD_256).encode(toEncode, numEcBytesInBlock);
byte[] ecBytes = new byte[numEcBytesInBlock];
for (int i = 0; i < numEcBytesInBlock; i++)
{
ecBytes[i] = (byte)toEncode[numDataBytes + i];
}
return ecBytes;
}
/// <summary>
/// Append mode info. On success, store the result in "bits".
/// </summary>
/// <param name="mode">The mode.</param>
/// <param name="bits">The bits.</param>
internal static void appendModeInfo(Mode mode, BitArray bits)
{
bits.appendBits(mode.Bits, 4);
}
/// <summary>
/// Append length info. On success, store the result in "bits".
/// </summary>
/// <param name="numLetters">The num letters.</param>
/// <param name="version">The version.</param>
/// <param name="mode">The mode.</param>
/// <param name="bits">The bits.</param>
internal static void appendLengthInfo(int numLetters, Version version, Mode mode, BitArray bits)
{
int numBits = mode.getCharacterCountBits(version);
if (numLetters >= (1 << numBits))
{
throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
/// <summary>
/// Append "bytes" in "mode" mode (encoding) into "bits". On success, store the result in "bits".
/// </summary>
/// <param name="content">The content.</param>
/// <param name="mode">The mode.</param>
/// <param name="bits">The bits.</param>
/// <param name="encoding">The encoding.</param>
internal static void appendBytes(String content,
Mode mode,
BitArray bits,
String encoding)
{
if (mode.Equals(Mode.NUMERIC))
appendNumericBytes(content, bits);
else
if (mode.Equals(Mode.ALPHANUMERIC))
appendAlphanumericBytes(content, bits);
else
if (mode.Equals(Mode.BYTE))
append8BitBytes(content, bits, encoding);
else
if (mode.Equals(Mode.KANJI))
appendKanjiBytes(content, bits);
else
throw new WriterException("Invalid mode: " + mode);
}
internal static void appendNumericBytes(String content, BitArray bits)
{
int length = content.Length;
int i = 0;
while (i < length)
{
int num1 = content[i] - '0';
if (i + 2 < length)
{
// Encode three numeric letters in ten bits.
int num2 = content[i + 1] - '0';
int num3 = content[i + 2] - '0';
bits.appendBits(num1 * 100 + num2 * 10 + num3, 10);
i += 3;
}
else if (i + 1 < length)
{
// Encode two numeric letters in seven bits.
int num2 = content[i + 1] - '0';
bits.appendBits(num1 * 10 + num2, 7);
i += 2;
}
else
{
// Encode one numeric letter in four bits.
bits.appendBits(num1, 4);
i++;
}
}
}
internal static void appendAlphanumericBytes(String content, BitArray bits)
{
int length = content.Length;
int i = 0;
while (i < length)
{
int code1 = getAlphanumericCode(content[i]);
if (code1 == -1)
{
throw new WriterException();
}
if (i + 1 < length)
{
int code2 = getAlphanumericCode(content[i + 1]);
if (code2 == -1)
{
throw new WriterException();
}
// Encode two alphanumeric letters in 11 bits.
bits.appendBits(code1 * 45 + code2, 11);
i += 2;
}
else
{
// Encode one alphanumeric letter in six bits.
bits.appendBits(code1, 6);
i++;
}
}
}
internal static void append8BitBytes(String content, BitArray bits, String encoding)
{
byte[] bytes;
try
{
bytes = Encoding.GetEncoding(encoding).GetBytes(content);
}
#if WindowsCE
catch (PlatformNotSupportedException)
{
try
{
// WindowsCE doesn't support all encodings. But it is device depended.
// So we try here the some different ones
if (encoding == "ISO-8859-1")
{
bytes = Encoding.GetEncoding(1252).GetBytes(content);
}
else
{
bytes = Encoding.GetEncoding("UTF-8").GetBytes(content);
}
}
catch (Exception uee)
{
throw new WriterException(uee.Message, uee);
}
}
#endif
catch (Exception uee)
{
throw new WriterException(uee.Message, uee);
}
foreach (byte b in bytes)
{
bits.appendBits(b, 8);
}
}
internal static void appendKanjiBytes(String content, BitArray bits)
{
byte[] bytes;
try
{
bytes = Encoding.GetEncoding("Shift_JIS").GetBytes(content);
}
catch (Exception uee)
{
throw new WriterException(uee.Message, uee);
}
if (bytes.Length % 2 != 0)
{
throw new WriterException("Kanji byte size not even");
}
int maxI = bytes.Length - 1; // bytes.length must be even
for (int i = 0; i < maxI; i += 2)
{
int byte1 = bytes[i] & 0xFF;
int byte2 = bytes[i + 1] & 0xFF;
int code = (byte1 << 8) | byte2;
int subtracted = -1;
if (code >= 0x8140 && code <= 0x9ffc)
{
subtracted = code - 0x8140;
}
else if (code >= 0xe040 && code <= 0xebbf)
{
subtracted = code - 0xc140;
}
if (subtracted == -1)
{
throw new WriterException("Invalid byte sequence");
}
int encoded = ((subtracted >> 8) * 0xc0) + (subtracted & 0xff);
bits.appendBits(encoded, 13);
}
}
private static void appendECI(CharacterSetECI eci, BitArray bits)
{
bits.appendBits(Mode.ECI.Bits, 4);
// This is correct for values up to 127, which is all we need now.
bits.appendBits(eci.Value, 8);
}
}
}
You can’t perform that action at this time.