PhysFSFileStream.cs
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/* PhysFSFileStream.cs - (c)2003 Gregory S. Read */
using System;
using System.Collections;
using System.IO;
namespace PhysFS_NET
{
public enum PhysFSFileMode {Read, Write, Append};
// Our exception class we'll use for throwing all PhysFS API related exception
public class PhysFSException : IOException
{
public PhysFSException(string Message) : base(Message) {}
public PhysFSException() : base(PhysFS_DLL.PHYSFS_getLastError()) {}
}
public unsafe class PhysFSFileStream : Stream
{
// ***Public properties***
public override bool CanRead
{
get
{
// Reading is supported
return true;
}
}
public override bool CanSeek
{
get
{
// Seek is supported
return true;
}
}
public override bool CanWrite
{
get
{
// Writing is supported
return true;
}
}
public override long Length
{
get
{
long TempLength;
TempLength = PhysFS_DLL.PHYSFS_fileLength(pHandle);
// If call returned an error, throw an exception
if(TempLength == -1)
throw new PhysFSException();
return TempLength;
}
}
public override long Position
{
get
{
long TempPosition;
TempPosition = PhysFS_DLL.PHYSFS_tell(pHandle);
// If call returned an error, throw an exception
if(TempPosition == -1)
throw new PhysFSException();
return TempPosition;
}
set
{
// Seek from beginning of file using the position value
Seek(value, SeekOrigin.Begin);
}
}
// ***Public methods***
public PhysFSFileStream(string FileName, PhysFSFileMode FileMode, ulong BufferSize)
{
// Open the specified file with the appropriate file access
switch(FileMode)
{
case PhysFSFileMode.Read:
pHandle = PhysFS_DLL.PHYSFS_openRead(FileName);
break;
case PhysFSFileMode.Write:
pHandle = PhysFS_DLL.PHYSFS_openWrite(FileName);
break;
case PhysFSFileMode.Append:
pHandle = PhysFS_DLL.PHYSFS_openAppend(FileName);
break;
default:
throw new PhysFSException("Invalid FileMode specified");
}
// If handle is null, an error occured, so raise an exception
//!!! Does object get created if exception is thrown?
if(pHandle == null)
throw new PhysFSException();
// Set buffer size, raise an exception if an error occured
if(PhysFS_DLL.PHYSFS_setBuffer(pHandle, BufferSize) == 0)
throw new PhysFSException();
}
// This constructor sets the buffer size to 0 if not specified
public PhysFSFileStream(string FileName, PhysFSFileMode FileMode) : this(FileName, FileMode, 0) {}
~PhysFSFileStream()
{
// Don't close the handle if they've specifically closed it already
if(!Closed)
Close();
}
public override void Flush()
{
if(PhysFS_DLL.PHYSFS_flush(pHandle) == 0)
throw new PhysFSException();
}
public override int Read(byte[] buffer, int offset, int count)
{
long RetValue;
fixed(byte *pbytes = &buffer[offset])
{
// Read into our allocated pointer
RetValue = PhysFS_DLL.PHYSFS_read(pHandle, pbytes, sizeof(byte), (uint)count);
}
if(RetValue == -1)
throw new PhysFSException();
// Return number of bytes read
// Note: This cast should be safe since we are only reading 'count' items, which
// is of type 'int'.
return (int)RetValue;
}
public override void Write(byte[] buffer, int offset, int count)
{
long RetValue;
fixed(byte* pbytes = &buffer[offset])
{
// Write buffer
RetValue = PhysFS_DLL.PHYSFS_write(pHandle, pbytes, sizeof(byte), (uint)count);
}
if(RetValue == -1)
throw new PhysFSException();
}
public override long Seek(long offset, SeekOrigin origin)
{
// Only seeking from beginning is supported by PhysFS API
if(origin != SeekOrigin.Begin)
throw new PhysFSException("Only seek origin of \"Begin\" is supported");
// Seek to specified offset, raise an exception if error occured
if(PhysFS_DLL.PHYSFS_seek(pHandle, (ulong)offset) == 0)
throw new PhysFSException();
// Since we always seek from beginning, the offset is always
// the absolute position.
return offset;
}
public override void SetLength(long value)
{
throw new NotSupportedException("SetLength method not supported in PhysFSFileStream objects.");
}
public override void Close()
{
// Close the handle
if(PhysFS_DLL.PHYSFS_close(pHandle) == 0)
throw new PhysFSException();
// File has been closed. Rock.
Closed = true;
}
// ***Private variables***
private void *pHandle;
private bool Closed = false;
}
}