Ap4AsyncReaderStream.cpp

#include "StdAfx.h"
#include "Ap4AsyncReaderStream.h"

AP4_AsyncReaderStream::AP4_AsyncReaderStream(CBaseSplitterFile* pFile) 
        : m_refs(1)
        , m_pFile(pFile)
{
        ASSERT(pFile);
}

AP4_AsyncReaderStream::~AP4_AsyncReaderStream()
{
        ASSERT(m_refs == 0);
}

void AP4_AsyncReaderStream::AddReference()
{
        ASSERT(m_refs > 0); 
        ++m_refs;
}

void AP4_AsyncReaderStream::Release()
{
        ASSERT(m_refs > 0); 
        if(--m_refs == 0) delete this;
}

AP4_Result AP4_AsyncReaderStream::Read(void* buffer, AP4_Size bytesToRead, AP4_Size* bytesRead)
{
        AP4_Size bytesAvail = (AP4_Size)(m_pFile->GetLength() - m_pFile->GetPos());

        if(bytesAvail < bytesToRead)
        {
                if(bytesRead) *bytesRead = bytesAvail;
                bytesToRead = bytesAvail;
        }

        if(bytesAvail == 0)
        {
                return AP4_ERROR_EOS;
        }

        if(FAILED(m_pFile->Read((BYTE*)buffer, bytesToRead)))
        {
                if(bytesRead) *bytesRead = 0;
                return AP4_ERROR_READ_FAILED;
        }

        if(bytesRead) *bytesRead = bytesToRead;
        return AP4_SUCCESS;
}

AP4_Result AP4_AsyncReaderStream::Write(const void* buffer, AP4_Size bytesToWrite, AP4_Size* bytesWritten)
{
    return AP4_ERROR_WRITE_FAILED;
}

AP4_Result AP4_AsyncReaderStream::Seek(AP4_Offset offset)
{
        m_pFile->Seek(offset);
        return m_pFile->GetPos() == offset ? AP4_SUCCESS : AP4_FAILURE;
}

AP4_Result AP4_AsyncReaderStream::Tell(AP4_Offset& offset)
{
        offset = (AP4_Offset)m_pFile->GetPos();
        return AP4_SUCCESS;
}

AP4_Result AP4_AsyncReaderStream::GetSize(AP4_Size& size)
{
        size = (AP4_Size)m_pFile->GetLength();
        return AP4_SUCCESS;
}

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