public SingleByteCharSetProber(SequenceModel model, bool reversed, CharsetProber nameProber)
{
this.model = model;
this.reversed = reversed;
this.nameProber = nameProber;
this.Reset();
}
public SingleByteCharSetProber(SequenceModel model, bool reversed, CharsetProber nameProber)
{
this.model = model;
this.reversed = reversed;
this.nameProber = nameProber;
this.Reset();
}
/// <summary>
/// New result
/// </summary>
public DetectionDetail(string encodingShortName, float confidence, CharsetProber prober = null,
TimeSpan?time = null, string statusLog = null)
{
EncodingName = encodingShortName;
Confidence = confidence;
Encoding = GetEncoding(encodingShortName);
Prober = prober;
Time = time;
StatusLog = statusLog;
}
protected virtual void Feed(byte[] buf, int offset, int len)
{
if (_done)
{
return;
}
if (len > 0)
{
_gotData = true;
}
// If the data starts with BOM, we know it is UTF
if (_start)
{
var bomSet = FindCharSetByBom(buf, len);
_start = false;
if (bomSet != null)
{
_detectionDetail = new DetectionDetail(bomSet, 1);
_done = true;
return;
}
}
FindInputState(buf, len);
switch (InputState)
{
case InputState.EscASCII:
_escCharsetProber = _escCharsetProber ?? new EscCharsetProber();
RunProber(buf, offset, len, _escCharsetProber);
break;
case InputState.Highbyte:
for (int i = 0; i < ProbersNum; i++)
{
var charsetProber = _charsetProbers[i];
if (charsetProber != null)
{
var found = RunProber(buf, offset, len, charsetProber);
if (found)
{
return;
}
}
}
break;
// else pure ascii
}
}
private bool RunProber(byte[] buf, int offset, int len, CharsetProber charsetProber)
{
var probingState = charsetProber.HandleData(buf, offset, len);
if (probingState == ProbingState.FoundIt)
{
_detectionDetail = new DetectionDetail(charsetProber);
return(true);
}
return(false);
}
/// <summary>
///
/// </summary>
/// <param name="listener">A listener object that is notified of the detected encocoding. Can be null.</param>
public UniversalDetector(ICharsetListener listener)
{
this.listener = listener;
this.escCharsetProber = null;
this.probers = new CharsetProber[3];
for (int i = 0; i < this.probers.Length; ++i)
{
this.probers[i] = null;
}
Reset();
}
/// <summary>
/// New result
/// </summary>
public DetectionDetail(string encodingShortName, float confidence, CharsetProber prober = null, TimeSpan?time = null)
{
EncodingName = encodingShortName;
Confidence = confidence;
try
{
Encoding = System.Text.Encoding.GetEncoding(encodingShortName);
}
catch (Exception)
{
//wrong name
}
Prober = prober;
Time = time;
}
private void FindInputState(byte[] buf, int len)
{
for (int i = 0; i < len; i++)
{
// other than 0xa0, if every other character is ascii, the page is ascii
if ((buf[i] & 0x80) != 0 && buf[i] != 0xA0)
{
// we got a non-ascii byte (high-byte)
if (InputState != InputState.Highbyte)
{
InputState = InputState.Highbyte;
// kill EscCharsetProber if it is active
_escCharsetProber = null;
// start multibyte and singlebyte charset prober
if (_charsetProbers[0] == null)
{
_charsetProbers[0] = new MBCSGroupProber();
}
if (_charsetProbers[1] == null)
{
_charsetProbers[1] = new SBCSGroupProber();
}
if (_charsetProbers[2] == null)
{
_charsetProbers[2] = new Latin1Prober();
}
}
}
else
{
if (InputState == InputState.PureASCII &&
(buf[i] == 0x1B || (buf[i] == 0x7B && _lastChar == 0x7E)))
{
// found escape character or HZ "~{"
InputState = InputState.EscASCII;
}
_lastChar = buf[i];
}
}
}
public void HandleData(byte[] buf, int offset, int length)
{
if (this.done)
{
return;
}
if (length > 0)
{
this.gotData = true;
}
if (this.start)
{
this.start = false;
if (length > 3)
{
int b1 = buf[offset] & 0xFF;
int b2 = buf[offset + 1] & 0xFF;
int b3 = buf[offset + 2] & 0xFF;
int b4 = buf[offset + 3] & 0xFF;
switch (b1)
{
case 0xEF:
if (b2 == 0xBB && b3 == 0xBF)
{
this.detectedCharset = Constants.CHARSET_UTF_8;
}
break;
case 0xFE:
if (b2 == 0xFF && b3 == 0x00 && b4 == 0x00)
{
this.detectedCharset = Constants.CHARSET_X_ISO_10646_UCS_4_3412;
}
else if (b2 == 0xFF)
{
this.detectedCharset = Constants.CHARSET_UTF_16BE;
}
break;
case 0x00:
if (b2 == 0x00 && b3 == 0xFE && b4 == 0xFF)
{
this.detectedCharset = Constants.CHARSET_UTF_32BE;
}
else if (b2 == 0x00 && b3 == 0xFF && b4 == 0xFE)
{
this.detectedCharset = Constants.CHARSET_X_ISO_10646_UCS_4_2143;
}
break;
case 0xFF:
if (b2 == 0xFE && b3 == 0x00 && b4 == 0x00)
{
this.detectedCharset = Constants.CHARSET_UTF_32LE;
}
else if (b2 == 0xFE)
{
this.detectedCharset = Constants.CHARSET_UTF_16LE;
}
break;
}
if (this.detectedCharset != null)
{
this.done = true;
return;
}
}
}
int maxPos = offset + length;
for (int i = offset; i < maxPos; ++i)
{
int c = buf[i] & 0xFF;
if ((c & 0x80) != 0 && c != 0xA0)
{
if (this.inputState != InputState.HIGHBYTE)
{
this.inputState = InputState.HIGHBYTE;
if (this.escCharsetProber != null)
{
this.escCharsetProber = null;
}
if (this.probers[0] == null)
{
this.probers[0] = new MBCSGroupProber();
}
if (this.probers[1] == null)
{
this.probers[1] = new SBCSGroupProber();
}
if (this.probers[2] == null)
{
this.probers[2] = new Latin1Prober();
}
}
}
else
{
if (this.inputState == InputState.PURE_ASCII &&
(c == 0x1B || (c == 0x7B && this.lastChar == 0x7E)))
{
this.inputState = InputState.ESC_ASCII;
}
this.lastChar = buf[i];
}
}
CharsetProber.ProbingState st;
if (this.inputState == InputState.ESC_ASCII)
{
if (this.escCharsetProber == null)
{
this.escCharsetProber = new EscCharsetProber();
}
st = this.escCharsetProber.handleData(buf, offset, length);
if (st == CharsetProber.ProbingState.FOUND_IT)
{
this.done = true;
this.detectedCharset = this.escCharsetProber.getCharSetName();
}
}
else if (this.inputState == InputState.HIGHBYTE)
{
for (int i = 0; i < this.probers.Length; ++i)
{
st = this.probers[i].handleData(buf, offset, length);
if (st == CharsetProber.ProbingState.FOUND_IT)
{
this.done = true;
this.detectedCharset = this.probers[i].getCharSetName();
return;
}
}
}
else
{
// Pure ascii. Do nothing.
}
}
public void SetModelProbers(CharsetProber logical, CharsetProber visual)
{
this.LogicalProber = logical;
this.VisualProber = visual;
}
/// <summary>
/// New Result
/// </summary>
public DetectionDetail(CharsetProber prober, TimeSpan?time = null)
: this(prober.GetCharsetName(), prober.GetConfidence(), prober, time)
{
}
public virtual void Feed(byte[] buf, int offset, int len)
{
if (done)
{
return;
}
if (len > 0)
{
gotData = true;
}
// If the data starts with BOM, we know it is UTF
if (start)
{
start = false;
if (len > 3)
{
switch (buf[0])
{
case 0xEF:
if (0xBB == buf[1] && 0xBF == buf[2])
{
detectedCharset = "UTF-8";
}
break;
case 0xFE:
if (0xFF == buf[1] && 0x00 == buf[2] && 0x00 == buf[3])
{
// FE FF 00 00 UCS-4, unusual octet order BOM (3412)
detectedCharset = "X-ISO-10646-UCS-4-3412";
}
else if (0xFF == buf[1])
{
detectedCharset = "UTF-16BE";
}
break;
case 0x00:
if (0x00 == buf[1] && 0xFE == buf[2] && 0xFF == buf[3])
{
detectedCharset = "UTF-32BE";
}
else if (0x00 == buf[1] && 0xFF == buf[2] && 0xFE == buf[3])
{
// 00 00 FF FE UCS-4, unusual octet order BOM (2143)
detectedCharset = "X-ISO-10646-UCS-4-2143";
}
break;
case 0xFF:
if (0xFE == buf[1] && 0x00 == buf[2] && 0x00 == buf[3])
{
detectedCharset = "UTF-32LE";
}
else if (0xFE == buf[1])
{
detectedCharset = "UTF-16LE";
}
break;
} // switch
}
if (detectedCharset != null)
{
done = true;
return;
}
}
for (int i = 0; i < len; i++)
{
// other than 0xa0, if every other character is ascii, the page is ascii
if ((buf[i] & 0x80) != 0 && buf[i] != 0xA0)
{
// we got a non-ascii byte (high-byte)
if (inputState != InputState.Highbyte)
{
inputState = InputState.Highbyte;
// kill EscCharsetProber if it is active
if (escCharsetProber != null)
{
escCharsetProber = null;
}
// start multibyte and singlebyte charset prober
if (charsetProbers[0] == null)
{
charsetProbers[0] = new MBCSGroupProber();
}
if (charsetProbers[1] == null)
{
charsetProbers[1] = new SBCSGroupProber();
}
if (charsetProbers[2] == null)
{
charsetProbers[2] = new Latin1Prober();
}
}
}
else
{
if (inputState == InputState.PureASCII &&
(buf[i] == 0x33 || (buf[i] == 0x7B && lastChar == 0x7E)))
{
// found escape character or HZ "~{"
inputState = InputState.EscASCII;
}
lastChar = buf[i];
}
}
ProbingState st = ProbingState.NotMe;
switch (inputState)
{
case InputState.EscASCII:
if (escCharsetProber == null)
{
escCharsetProber = new EscCharsetProber();
}
st = escCharsetProber.HandleData(buf, offset, len);
if (st == ProbingState.FoundIt)
{
done = true;
detectedCharset = escCharsetProber.GetCharsetName();
}
break;
case InputState.Highbyte:
for (int i = 0; i < PROBERS_NUM; i++)
{
if (charsetProbers[i] != null)
{
st = charsetProbers[i].HandleData(buf, offset, len);
#if DEBUG
charsetProbers[i].DumpStatus();
#endif
if (st == ProbingState.FoundIt)
{
done = true;
detectedCharset = charsetProbers[i].GetCharsetName();
return;
}
}
}
break;
default:
// pure ascii
break;
}
return;
}
public void SetModelProbers(CharsetProber logical, CharsetProber visual)
{
logicalProber = logical;
visualProber = visual;
}
public void SetModelProbers(CharsetProber logical, CharsetProber visual)
{
this.LogicalProber = logical;
this.VisualProber = visual;
}
