public NSString Decode(NSData data, out uint encoding)
{
Contract.Requires(data != null, "data is null");
NSString result = null;
if (data.length() > 0)
{
int skipBytes = 0;
encoding = DoGetEncoding(data, ref skipBytes);
if (encoding != 0)
{
if (skipBytes > 0)
data = data.subdataWithRange(new NSRange(skipBytes, (int) data.length() - skipBytes));
result = DoDecode(data, encoding);
// The first few bytes of most legacy documents will look like utf8 so
// if we couldn't decode it using utf8 we need to fall back onto Mac
// OS Roman.
if (NSObject.IsNullOrNil(result) && encoding == Enums.NSUTF8StringEncoding)
{
encoding = Enums.NSMacOSRomanStringEncoding;
result = DoDecode(data, encoding);
}
}
if (NSObject.IsNullOrNil(result))
throw new InvalidOperationException("Couldn't read the file as Unicode or Mac OS Roman."); // should only happen if there are embedded control characters in the header
}
else
{
result = NSString.Empty;
encoding = Enums.NSUTF8StringEncoding;
}
return result;
}
private NSMutableAttributedString DoReadWrapped(NSData data, NSString type)
{
NSMutableAttributedString str;
if (data.length() > 0)
{
NSDictionary options = NSDictionary.dictionaryWithObject_forKey(type, Externs.NSDocumentTypeDocumentAttribute);
NSError error;
str = NSMutableAttributedString.Alloc().initWithData_options_documentAttributes_error(data, options, IntPtr.Zero, out error).To<NSMutableAttributedString>();
if (!NSObject.IsNullOrNil(error))
error.Raise();
str.autorelease();
}
else
str = NSMutableAttributedString.Create();
return str;
}
public bool readFromData_ofType_error(NSData data, NSString typeName, IntPtr outError)
{
bool read = false;
try
{
Contract.Assert(NSObject.IsNullOrNil(m_text), "m_text is not null");
if (DoShouldOpen(data.length()))
{
DoReadData(data, typeName);
if (NSObject.IsNullOrNil(m_text))
throw new InvalidOperationException("Couldn't decode the file.");
string text = m_text.string_().description();
DoSetEndian(text);
DoCheckForControlChars(m_text.string_());
if (m_controller != null) // will be null for initial open, but non-null for revert
{
m_controller.RichText = m_text;
m_text = null;
}
else
m_text.retain();
read = true;
Marshal.WriteIntPtr(outError, IntPtr.Zero);
}
else
{
NSObject error = NSError.errorWithDomain_code_userInfo(Externs.Cocoa3Domain, Enums.NSUserCancelledError, null);
Marshal.WriteIntPtr(outError, error);
}
}
catch (Exception e)
{
Log.WriteLine(TraceLevel.Error, "App", "Couldn't open {0:D}", fileURL());
Log.WriteLine(TraceLevel.Error, "App", "{0}", e);
NSMutableDictionary userInfo = NSMutableDictionary.Create();
userInfo.setObject_forKey(NSString.Create("Couldn't read the document data."), Externs.NSLocalizedDescriptionKey);
userInfo.setObject_forKey(NSString.Create(e.Message), Externs.NSLocalizedFailureReasonErrorKey);
NSObject error = NSError.errorWithDomain_code_userInfo(Externs.Cocoa3Domain, 1, userInfo);
Marshal.WriteIntPtr(outError, error);
}
return read;
}