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/******************************************************************************
*
* Project: CPL - Common Portability Library
* Purpose: File handler that uses a temporary file, and upload file on close
* Author: Even Rouault, even.rouault at spatialys.com
*
******************************************************************************
* Copyright (c) 2020, Even Rouault <even.rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "cpl_vsi_virtual.h"
#include <algorithm>
#include <vector>
/************************************************************************/
/* VSIUploadOnCloseHandle */
/************************************************************************/
class VSIUploadOnCloseHandle final : public VSIVirtualHandle
{
VSIVirtualHandle *m_poBaseHandle;
CPLString m_osTmpFilename;
VSILFILE *m_fpTemp;
VSIUploadOnCloseHandle(const VSIUploadOnCloseHandle &) = delete;
VSIUploadOnCloseHandle &operator=(const VSIUploadOnCloseHandle &) = delete;
public:
VSIUploadOnCloseHandle(VSIVirtualHandle *poBaseHandle,
const CPLString &osTmpFilename, VSILFILE *fpTemp)
: m_poBaseHandle(poBaseHandle), m_osTmpFilename(osTmpFilename),
m_fpTemp(fpTemp)
{
}
~VSIUploadOnCloseHandle() override;
int Seek(vsi_l_offset nOffset, int nWhence) override
{
return VSIFSeekL(m_fpTemp, nOffset, nWhence);
}
vsi_l_offset Tell() override
{
return VSIFTellL(m_fpTemp);
}
size_t Read(void *pBuffer, size_t nSize, size_t nCount) override
{
return VSIFReadL(pBuffer, nSize, nCount, m_fpTemp);
}
size_t Write(const void *pBuffer, size_t nSize, size_t nCount) override
{
return VSIFWriteL(pBuffer, nSize, nCount, m_fpTemp);
}
int Eof() override
{
return VSIFEofL(m_fpTemp);
}
int Flush() override
{
return VSIFFlushL(m_fpTemp);
}
int Close() override;
int Truncate(vsi_l_offset nNewSize) override
{
return VSIFTruncateL(m_fpTemp, nNewSize);
}
VSIRangeStatus GetRangeStatus(vsi_l_offset nOffset,
vsi_l_offset nLength) override
{
return VSIFGetRangeStatusL(m_fpTemp, nOffset, nLength);
}
};
/************************************************************************/
/* ~VSIUploadOnCloseHandle() */
/************************************************************************/
VSIUploadOnCloseHandle::~VSIUploadOnCloseHandle()
{
VSIUploadOnCloseHandle::Close();
if (m_fpTemp)
VSIFCloseL(m_fpTemp);
if (!m_osTmpFilename.empty())
VSIUnlink(m_osTmpFilename);
delete m_poBaseHandle;
}
/************************************************************************/
/* Close() */
/************************************************************************/
int VSIUploadOnCloseHandle::Close()
{
if (m_fpTemp == nullptr)
return -1;
// Copy temporary files to m_poBaseHandle
if (VSIFSeekL(m_fpTemp, 0, SEEK_END) != 0)
{
VSIFCloseL(m_fpTemp);
m_fpTemp = nullptr;
return -1;
}
const auto nSize = VSIFTellL(m_fpTemp);
VSIFSeekL(m_fpTemp, 0, SEEK_SET);
constexpr size_t CHUNK_SIZE = 1024 * 1024;
vsi_l_offset nOffset = 0;
std::vector<GByte> abyBuffer(CHUNK_SIZE);
while (nOffset < nSize)
{
size_t nToRead = static_cast<size_t>(
std::min(nSize - nOffset, static_cast<vsi_l_offset>(CHUNK_SIZE)));
if (VSIFReadL(&abyBuffer[0], nToRead, 1, m_fpTemp) != 1 ||
m_poBaseHandle->Write(&abyBuffer[0], nToRead, 1) != 1)
{
VSIFCloseL(m_fpTemp);
m_fpTemp = nullptr;
return -1;
}
nOffset += nToRead;
}
VSIFCloseL(m_fpTemp);
m_fpTemp = nullptr;
return m_poBaseHandle->Close();
}
/************************************************************************/
/* VSICreateUploadOnCloseFile() */
/************************************************************************/
VSIVirtualHandle *VSICreateUploadOnCloseFile(VSIVirtualHandle *poBaseHandle)
{
CPLString osTmpFilename(CPLGenerateTempFilename(nullptr));
VSILFILE *fpTemp = VSIFOpenL(osTmpFilename, "wb+");
if (fpTemp == nullptr)
return nullptr;
const bool deleted = VSIUnlink(osTmpFilename) == 0;
return new VSIUploadOnCloseHandle(
poBaseHandle, deleted ? CPLString() : osTmpFilename, fpTemp);
}
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