/// <summary>
/// Seeks in an unmanaged stream.
/// </summary>
protected int Seek(FreeImageIO io, fi_handle handle, int offset, SeekOrigin origin)
{
return(io.seekProc(handle, offset, origin));
}
public void FreeImageStreamIO()
{
Random rand = new Random();
byte[] bBuffer = new byte[256];
IntPtr buffer = Marshal.AllocHGlobal(256);
MemoryStream stream = new MemoryStream();
Assert.IsNotNull(stream);
using (fi_handle handle = new fi_handle(stream))
{
FreeImageIO io = FreeImageAPI.IO.FreeImageStreamIO.io;
Assert.IsNotNull(io.readProc);
Assert.IsNotNull(io.writeProc);
Assert.IsNotNull(io.seekProc);
Assert.IsNotNull(io.tellProc);
//
// Procs
//
rand.NextBytes(bBuffer);
stream.Write(bBuffer, 0, bBuffer.Length);
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
// Read one block
Assert.That(io.readProc(buffer, (uint)bBuffer.Length, 1, handle) == 1);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
// Read 1 byte block
Assert.That(io.readProc(buffer, 1, (uint)bBuffer.Length, handle) == bBuffer.Length);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
rand.NextBytes(bBuffer);
for (int i = 0; i < bBuffer.Length; i++)
{
Marshal.WriteByte(buffer, i, bBuffer[i]);
}
// Write one block
Assert.That(io.writeProc(buffer, (uint)bBuffer.Length, 1, handle) == 1);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
// write 1 byte block
Assert.That(io.writeProc(buffer, 1, (uint)bBuffer.Length, handle) == bBuffer.Length);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
// Seek and tell
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
Assert.That(io.seekProc(handle, 127, SeekOrigin.Current) == 0);
Assert.That(io.tellProc(handle) == 127);
Assert.That(io.seekProc(handle, 0, SeekOrigin.End) == 0);
Assert.That(io.tellProc(handle) == 256);
Marshal.FreeHGlobal(buffer);
stream.Dispose();
}
}
