AsyncReader.h

/* 
 *      Copyright (C) 2003-2005 Gabest
 *      http://www.gabest.org
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *   
 *  This Program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *   
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#pragma once

[uuid("6DDB4EE7-45A0-4459-A508-BD77B32C91B2")]
interface ISyncReader : public IUnknown
{
        STDMETHOD_(void, SetBreakEvent) (HANDLE hBreakEvent) = 0;
        STDMETHOD_(bool, HasErrors) () = 0;
        STDMETHOD_(void, ClearErrors) () = 0;
};

[uuid("7D55F67A-826E-40B9-8A7D-3DF0CBBD272D")]
interface IFileHandle : public IUnknown
{
        STDMETHOD_(HANDLE, GetFileHandle)() = 0;
};

class CAsyncFileReader : public CUnknown, public CFile, public IAsyncReader, public ISyncReader, public IFileHandle
{
protected:
        ULONGLONG m_len;
        HANDLE m_hBreakEvent;
        LONG m_lOsError; // CFileException::m_lOsError

public:
        CAsyncFileReader(CString fn, HRESULT& hr);

        DECLARE_IUNKNOWN;
        STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);

        // IAsyncReader

        STDMETHODIMP RequestAllocator(IMemAllocator* pPreferred, ALLOCATOR_PROPERTIES* pProps, IMemAllocator** ppActual) {return E_NOTIMPL;}
    STDMETHODIMP Request(IMediaSample* pSample, DWORD_PTR dwUser) {return E_NOTIMPL;}
    STDMETHODIMP WaitForNext(DWORD dwTimeout, IMediaSample** ppSample, DWORD_PTR* pdwUser) {return E_NOTIMPL;}
        STDMETHODIMP SyncReadAligned(IMediaSample* pSample) {return E_NOTIMPL;}
        STDMETHODIMP SyncRead(LONGLONG llPosition, LONG lLength, BYTE* pBuffer);
        STDMETHODIMP Length(LONGLONG* pTotal, LONGLONG* pAvailable);
        STDMETHODIMP BeginFlush() {return E_NOTIMPL;}
        STDMETHODIMP EndFlush() {return E_NOTIMPL;}

        // ISyncReader

        STDMETHODIMP_(void) SetBreakEvent(HANDLE hBreakEvent) {m_hBreakEvent = hBreakEvent;}
        STDMETHODIMP_(bool) HasErrors() {return m_lOsError != 0;}
        STDMETHODIMP_(void) ClearErrors() {m_lOsError = 0;}

        // IFileHandle

        STDMETHODIMP_(HANDLE) GetFileHandle();

};

class CAsyncUrlReader : public CAsyncFileReader, protected CAMThread
{
        CString m_url, m_fn;

protected:
        enum {CMD_EXIT, CMD_INIT};
    DWORD ThreadProc();

public:
        CAsyncUrlReader(CString url, HRESULT& hr);
        virtual ~CAsyncUrlReader();

        // IAsyncReader

        STDMETHODIMP Length(LONGLONG* pTotal, LONGLONG* pAvailable);
};

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