Method CopyFile

port/cpl_vsil.cpp:2073–2181

/************************************************************************/

int VSIFilesystemHandler::CopyFile(const char *pszSource, const char *pszTarget,
                                   VSILFILE *fpSource, vsi_l_offset nSourceSize,
                                   CSLConstList papszOptions,
                                   GDALProgressFunc pProgressFunc,
                                   void *pProgressData)
{
    VSIVirtualHandleUniquePtr poFileHandleAutoClose;
    if (!fpSource)
    {
        CPLAssert(pszSource);
        fpSource = VSIFOpenExL(pszSource, "rb", TRUE);
        if (!fpSource)
        {
            CPLError(CE_Failure, CPLE_FileIO, "Cannot open %s", pszSource);
            return -1;
        }
        poFileHandleAutoClose.reset(fpSource);
    }
    if (nSourceSize == static_cast<vsi_l_offset>(-1) &&
        pProgressFunc != nullptr && pszSource != nullptr)
    {
        VSIStatBufL sStat;
        if (VSIStatL(pszSource, &sStat) == 0)
        {
            nSourceSize = sStat.st_size;
        }
    }

    VSILFILE *fpOut = VSIFOpenEx2L(pszTarget, "wb", TRUE, papszOptions);
    if (!fpOut)
    {
        CPLError(CE_Failure, CPLE_FileIO, "Cannot create %s", pszTarget);
        return -1;
    }

    CPLString osMsg;
    if (pszSource)
        osMsg.Printf("Copying of %s", pszSource);
    else
        pszSource = "(unknown filename)";

    int ret = 0;
    constexpr size_t nBufferSize = 10 * 4096;
    std::vector<GByte> abyBuffer(nBufferSize, 0);
    GUIntBig nOffset = 0;
    while (true)
    {
        const size_t nRead = VSIFReadL(&abyBuffer[0], 1, nBufferSize, fpSource);
        if (nRead < nBufferSize && VSIFErrorL(fpSource))
        {
            CPLError(
                CE_Failure, CPLE_FileIO,
                "Copying of %s to %s failed: error while reading source file",
                pszSource, pszTarget);
            ret = -1;
            break;
        }
        if (nRead > 0)