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using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;
namespace LibGit2Sharp.Core
{
internal abstract class EncodingMarshaler : ICustomMarshaler
{
private readonly Encoding encoding;
protected EncodingMarshaler(Encoding encoding)
{
this.encoding = encoding;
}
#region ICustomMarshaler
public void CleanUpManagedData(object managedObj)
{
}
public virtual void CleanUpNativeData(IntPtr pNativeData)
{
Cleanup(pNativeData);
}
public int GetNativeDataSize()
{
// Not a value type
return -1;
}
public virtual IntPtr MarshalManagedToNative(Object managedObj)
{
if (managedObj == null)
{
return IntPtr.Zero;
}
var str = managedObj as string;
if (str == null)
{
throw new MarshalDirectiveException(
string.Format("{0} must be used on a string.", GetType().Name));
}
return FromManaged(encoding, str);
}
public virtual Object MarshalNativeToManaged(IntPtr pNativeData)
{
return FromNative(encoding, pNativeData);
}
#endregion
public static unsafe IntPtr FromManaged(Encoding encoding, String value)
{
if (value == null)
{
return IntPtr.Zero;
}
int length = encoding.GetByteCount(value);
var buffer = (byte*)Marshal.AllocHGlobal(length + 1).ToPointer();
if (length > 0)
{
fixed (char* pValue = value)
{
encoding.GetBytes(pValue, value.Length, buffer, length);
}
}
buffer[length] = 0;
return new IntPtr(buffer);
}
public static void Cleanup(IntPtr pNativeData)
{
if (pNativeData == IntPtr.Zero)
{
return;
}
Marshal.FreeHGlobal(pNativeData);
}
public static unsafe string FromNative(Encoding encoding, IntPtr pNativeData)
{
if (pNativeData == IntPtr.Zero)
{
return null;
}
var start = (byte*)pNativeData;
byte* walk = start;
// Find the end of the string
while (*walk != 0)
{
walk++;
}
if (walk == start)
{
return String.Empty;
}
return new String((sbyte*)pNativeData.ToPointer(), 0, (int)(walk - start), encoding);
}
public static unsafe string FromNative(Encoding encoding, IntPtr pNativeData, int length)
{
if (pNativeData == IntPtr.Zero)
{
return null;
}
if (length == 0)
{
return String.Empty;
}
return new String((sbyte*)pNativeData.ToPointer(), 0, length, encoding);
}
public static string FromBuffer(Encoding encoding, byte[] buffer)
{
if (buffer == null)
{
return null;
}
int length = 0;
int stop = buffer.Length;
while (length < stop &&
0 != buffer[length])
{
length++;
}
return FromBuffer(encoding, buffer, length);
}
public static string FromBuffer(Encoding encoding, byte[] buffer, int length)
{
Debug.Assert(buffer != null);
if (length == 0)
{
return String.Empty;
}
return encoding.GetString(buffer, 0, length);
}
}
}
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