public static Encoding[] DetectInputCodepages(byte[] input, int maxEncodings)
{
if (maxEncodings < 1)
{
throw new ArgumentOutOfRangeException("at least one encoding must be returend", "maxEncodings");
}
if (input == null)
{
throw new ArgumentNullException("input");
}
if (input.Length == 0)
{
return(new Encoding[] { Encoding.ASCII });
}
if (input.Length < 256)
{
byte[] newInput = new byte[256];
int steps = 256 / input.Length;
for (int i = 0; i < steps; i++)
{
Array.Copy(input, 0, newInput, input.Length * i, input.Length);
}
int rest = 256 % input.Length;
if (rest > 0)
{
Array.Copy(input, 0, newInput, steps * input.Length, rest);
}
input = newInput;
}
List <Encoding> result = new List <Encoding>();
IMultiLanguage2 multilang2 = new FMultiLanguageClass();
if (multilang2 == null)
{
throw new System.Runtime.InteropServices.COMException("Failed to get IMultilang2");
}
try {
SDetectEncodingInfo[] detectedEncdings = new SDetectEncodingInfo[maxEncodings];
int scores = detectedEncdings.Length;
int srcLen = input.Length;
SMlDetectCp options = SMlDetectCp.MLDETECTCP_NONE;
multilang2.DetectInputCodepage(options, 0, ref input[0], ref srcLen, ref detectedEncdings[0], ref scores);
if (scores > 0)
{
for (int i = 0; i < scores; i++)
{
result.Add(Encoding.GetEncoding((int)detectedEncdings[i].nCodePage));
}
}
} finally {
Marshal.FinalReleaseComObject(multilang2);
}
return(result.ToArray());
}
public static Encoding[] DetectOutgoingEncodings(string input, int[] preferedEncodings, bool preserveOrder)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
if (input.Length == 0)
{
return new Encoding[] { Encoding.ASCII }
}
;
List <Encoding> result = new List <Encoding>();
IMultiLanguage3 multilang3 = new FMultiLanguageClass();
if (multilang3 == null)
{
throw new System.Runtime.InteropServices.COMException("Failed to get IMultilang3");
}
try {
int[] resultCodePages = new int[preferedEncodings.Length];
uint detectedCodepages = (uint)resultCodePages.Length;
ushort specialChar = (ushort)'?';
IntPtr pPrefEncs = Marshal.AllocCoTaskMem(sizeof(uint) * preferedEncodings.Length);
IntPtr pDetectedEncs = preferedEncodings == null ? IntPtr.Zero : Marshal.AllocCoTaskMem(sizeof(uint) * resultCodePages.Length);
try {
if (preferedEncodings != null)
{
Marshal.Copy(preferedEncodings, 0, pPrefEncs, preferedEncodings.Length);
}
Marshal.Copy(resultCodePages, 0, pDetectedEncs, resultCodePages.Length);
SMlCpf options = SMlCpf.MLDETECTF_VALID_NLS | SMlCpf.MLDETECTF_PREFERRED_ONLY;
if (preserveOrder)
{
options |= SMlCpf.MLDETECTF_PRESERVE_ORDER;
}
if (preferedEncodings != null)
{
options |= SMlCpf.MLDETECTF_PREFERRED_ONLY;
}
multilang3.DetectOutboundCodePage(options,
input, (uint)input.Length,
pPrefEncs, (uint)(preferedEncodings == null ? 0 : preferedEncodings.Length),
pDetectedEncs, ref detectedCodepages,
ref specialChar);
if (detectedCodepages > 0)
{
int[] theResult = new int[detectedCodepages];
Marshal.Copy(pDetectedEncs, theResult, 0, theResult.Length);
for (int i = 0; i < detectedCodepages; i++)
{
result.Add(Encoding.GetEncoding(theResult[i]));
}
}
} finally {
if (pPrefEncs != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(pPrefEncs);
}
Marshal.FreeCoTaskMem(pDetectedEncs);
}
} finally {
Marshal.FinalReleaseComObject(multilang3);
}
return(result.ToArray());
}
