/// <summary>Detects the possible code pages by reading a specified stream.</summary>
/// <remarks>The stream reader position is reset after reading.</remarks>
/// <returns>The detected code pages, which will have zero length if none was detected.</returns>
internal static int[] DetectCodePages(Stream stream)
{
const int BUFFERSIZE = 1024;
nsDetector detector = new nsDetector(nsPSMDetector.ALL);
detector.Init(null);
byte[] buffer = new byte[BUFFERSIZE];
int readLength = 0;
bool finished = false;
while (!finished)
{
readLength = stream.Read(buffer, 0, buffer.Length);
if (readLength == 0)
{
break;
}
finished = detector.DoIt(buffer, readLength, false);
}
detector.Done();
stream.Seek(0, SeekOrigin.Begin);
string[] detectedEncodings = detector.getProbableCharsets();
Logger.Info("[FileInputOutput] Detected encodings: {0}", String.Join(", ", detectedEncodings));
/* Check if no encoding was detected */
if (detectedEncodings[0] == "nomatch")
{
return(new int[0]);
}
return(GetCodePages(detectedEncodings));
}
public static string DetectChineseCharset(string filePath)
{
CharsetDetector.DetectedCharset = "GB2312";
nsDetector nsDetector = new nsDetector(3);
Notifier aObserver = new Notifier();
nsDetector.Init(aObserver);
byte[] array = new byte[1024];
int aLen = File.OpenRead(filePath).Read(array, 0, array.Length);
bool flag = nsDetector.isAscii(array, aLen);
if (!flag)
{
nsDetector.DoIt(array, aLen, false);
}
nsDetector.DataEnd();
if (flag)
{
CharsetDetector.DetectedCharset = "ASCII";
}
if (File.ReadAllText(filePath).Contains("CONTENT=\"text/html; charset=gb2312\""))
{
CharsetDetector.DetectedCharset = "GB2312";
}
return(CharsetDetector.DetectedCharset);
}
public Encoding sniff()
{
nsDetector detector = new nsDetector(nsPSMDetector.ALL);
detector.Init(this);
detector.DoIt(source, length, false);
detector.DataEnd();
if (returnValue != null && returnValue != Encoding.WINDOWS1252 && returnValue.isAsciiSuperset()) {
return returnValue;
} else {
return null;
}
}
public static Encoding DetectEncoding(string filePath)
{
var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
Encoding encoding = null;
var det = new nsDetector(2);
var not = new Notifier();
det.Init(not);
var done = false;
var isAscii = true;
var buf = new byte[1024];
int len = fs.Read(buf, 0, buf.Length);
//For some reason NCharDet can't detect Unicode.
//Manual detect Unicode here.
if (len >= 2 && buf[0] == 0xFF && buf[1] == 0xFE)
{
fs.Close();
det.DataEnd();
return(Encoding.Unicode);
}
while (len > 0)
{
// Check if the stream is only ascii.
if (isAscii)
{
isAscii = det.isAscii(buf, len);
}
// DoIt if non-ascii and not done yet.
if (!isAscii && !done)
{
done = det.DoIt(buf, len, false);
}
len = fs.Read(buf, 0, buf.Length);
}
fs.Close();
det.DataEnd();
if (isAscii)
{
encodingFound = true;
encoding = Encoding.ASCII;
}
if (!encodingFound)
{
string[] prob = det.getProbableCharsets();
encodingName = prob[0];
}
if (encoding == null)
{
encoding = Encoding.GetEncoding(encodingName);
}
return(encoding);
}
public static string detEncoding = string.Empty; // 自动检测到的文件类型
public void TransEncoding(string srcFullName, string dstFullName,
string dstEncoding = "utf8",
bool IsAutoDet = true, string srcEncoding = "gb2312")
{
Encoding Edst = Encoding.GetEncoding(dstEncoding);
Encoding Esrc = Encoding.GetEncoding(srcEncoding);
if (IsAutoDet)
{
#region 检测编码
nsDetector det = new nsDetector();
Notifier not = new Notifier();
det.Init(not);
byte[] buf = new byte[1024];
int len;
bool done = false;
bool isAscii = true;
FileStream fs = File.OpenRead(srcFullName);
len = fs.Read(buf, 0, buf.Length);
while (len > 0)
{
// Check if the stream is only ascii.
if (isAscii)
{
isAscii = det.isAscii(buf, len);
}
// DoIt if non-ascii and not done yet.
if (!isAscii && !done)
{
done = det.DoIt(buf, len, false);
}
len = fs.Read(buf, 0, buf.Length);
}
det.DataEnd();
fs.Close();
if (isAscii)
{
found = true;
detEncoding = "ASCII";
}
if (!found)
{
string[] prob = det.getProbableCharsets();
if (prob.Length > 0)
{
detEncoding = prob[0];
}
else
{
detEncoding = srcEncoding;
}
}
#endregion
Esrc = Encoding.GetEncoding(detEncoding);
}
#region 编码转换
string strAll = File.ReadAllText(srcFullName, Esrc);
File.WriteAllText(dstFullName, strAll, Edst);
#endregion
}
