WMA decoder: support streams as input

CUETools.Codecs.WMA/IStreamWrapper.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Runtime.InteropServices.ComTypes;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace CUETools.Codecs.WMA
+{
+    public class StreamWrapper : IStream
+    {
+        public StreamWrapper(Stream stream)
+        {
+            if (stream == null)
+                throw new ArgumentNullException("stream", "Can't wrap null stream.");
+            this.stream = stream;
+        }
+
+        private Stream stream;
+
+        public void Read(byte[] pv, int cb, System.IntPtr pcbRead)
+        {
+            Marshal.WriteInt32(pcbRead, (Int32)stream.Read(pv, 0, cb));
+        }
+
+        public void Seek(long dlibMove, int dwOrigin, System.IntPtr plibNewPosition)
+        {
+            var res = stream.Seek(dlibMove, (SeekOrigin)dwOrigin);
+            if (plibNewPosition != IntPtr.Zero) Marshal.WriteInt32(plibNewPosition, (int)res);
+        }
+
+        public void Stat(out System.Runtime.InteropServices.ComTypes.STATSTG pstatstg, int grfStatFlag)
+        {
+            if (grfStatFlag != 1) // STATFLAG_NONAME
+                throw new NotSupportedException();
+            var statstg = new System.Runtime.InteropServices.ComTypes.STATSTG();
+            statstg.type = 2; // STGTY.STREAM
+            statstg.cbSize = stream.Length;
+            pstatstg = statstg;
+        }
+
+        public void Clone(out IStream ppstm)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void Commit(int grfCommitFlags)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void CopyTo(IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void LockRegion(long libOffset, long cb, int dwLockType)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void Revert()
+        {
+            throw new NotSupportedException();
+        }
+
+        public void SetSize(long libNewSize)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void UnlockRegion(long libOffset, long cb, int dwLockType)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void Write(byte[] pv, int cb, IntPtr pcbWritten)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}