linux_dev.cpp

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

/*//////////////////////////////////////////////////////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2003-2005 Intel Corporation. All Rights Reserved.
//
*/

/*
    This file contains class covering Linux /dev situated devices interface
*/

#ifdef LINUX32

#include "linux_dev.h"
#include "vm_debug.h"
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <vm_debug.h>

UMC::Status
UMC::LinuxDev::Init(vm_char* szDevName, int iMode)
{
    Status umcRes = UMC_OK;

    assert(NULL != szDevName);
    Close();

    m_iHandle = open(szDevName, iMode);
    if (-1 == m_iHandle) {
        vm_debug_trace(7,__VM_STRING("LinuxDev::Init: %s device open error\n"),
                                                                szDevName);
        umcRes = UMC_FAILED_TO_OPEN_DEVICE;
    }
    else
    {   m_iMode = iMode;    }

    return umcRes;
}

UMC::Status
UMC::LinuxDev::Read(vm_byte* pbData, vm_var32 uiDataSize, vm_var32* puiReadSize)
{
    Status umcRes = UMC_OK;
    assert(-1 != m_iHandle);
    assert(NULL != pbData);
    assert(0 != uiDataSize);

    if (NULL != puiReadSize)
    {   *puiReadSize = 0;   }

    ssize_t readRes = read(m_iHandle, pbData, uiDataSize);

    switch (readRes) {
    case 0:
        umcRes = UMC_END_OF_STREAM;
        break;
    case -1:
        umcRes = UMC_OPERATION_FAILED;
        vm_debug_trace(7,__VM_STRING("LinuxDev::Read: read error\n"));
        break;
    default:
        if (NULL != puiReadSize)
        {   *puiReadSize = readRes; }
    }

    return umcRes;
}

UMC::Status
UMC::LinuxDev::Write(vm_byte* pbBuffer, vm_var32 uiBufSize, vm_var32* puiWroteSize)
{
    Status umcRes = UMC_OK;
    assert(-1 != m_iHandle);
    assert(NULL != pbBuffer);
    assert(0 != uiBufSize);

    if (NULL != puiWroteSize)
    {   *puiWroteSize = 0;   }

    ssize_t readRes = write(m_iHandle, pbBuffer, uiBufSize);

    if (-1 == readRes) {
        umcRes = UMC_OPERATION_FAILED;
        vm_debug_trace(7,__VM_STRING("LinuxDev::Read: read error\n"));
    } else if (NULL != puiWroteSize)
    {   *puiWroteSize = readRes; }

    return umcRes;
}

UMC::Status
UMC::LinuxDev::Ioctl(int iReqCode)
{
    Status umcRes = UMC_OK;
    assert(-1 != m_iHandle);

    int iRes = ioctl(m_iHandle, iReqCode);
    if (-1 == iRes) {   umcRes = UMC_OPERATION_FAILED;    }

    return umcRes;
}

UMC::Status
UMC::LinuxDev::Ioctl(int iReqCode, vm_var32 uiParam)
{
    Status umcRes = UMC_OK;
    assert(-1 != m_iHandle);

    int iRes = ioctl(m_iHandle, iReqCode, uiParam);
    if (-1 == iRes) {   umcRes = UMC_OPERATION_FAILED;    }

    return umcRes;
}

void
UMC::LinuxDev::Close()
{
    if (-1 != m_iHandle) {
        close(m_iHandle);
        m_iHandle = -1;
        m_iMode = 0;
    }
}

#endif // LINUX32