// 
// CGPDFString: Helper class to deal with CGPDFStringRef
//
// Authors:
//	Miguel de Icaza <miguel@xamarin.com>
//	Sebastien Pouliot <sebastien@xamarin.com>
// 
// Copyright 2011 Xamarin Inc. All rights reserved
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Runtime.InteropServices;

namespace MonoMac.CoreGraphics {
	
	// internal helper class only - we avoid exposing it to users
	static class CGPDFString {
		
		[DllImport (Constants.CoreGraphicsLibrary)]
		extern static IntPtr CGPDFStringGetBytePtr (IntPtr pdfStr);

		[DllImport (Constants.CoreGraphicsLibrary)]
		extern static IntPtr CGPDFStringGetLength (IntPtr pdfStr);

		static public string ToString (IntPtr pdfString)
		{
			if (pdfString == IntPtr.Zero)
				return null;
			
			int n = (int) CGPDFStringGetLength (pdfString);
			IntPtr ptr = CGPDFStringGetBytePtr (pdfString);
			if (ptr == IntPtr.Zero)
				return null;
			
			unsafe {
				// the returned char* is UTF-8 encoded - see bug #975
				return new string ((sbyte *) ptr, 0, n, System.Text.Encoding.UTF8);
			}
		}
	}
}