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rawdataset.cpp
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rawdataset.cpp
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/******************************************************************************
*
* Project: Generic Raw Binary Driver
* Purpose: Implementation of RawDataset and RawRasterBand classes.
* Author: Frank Warmerdam, warmerda@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
* Copyright (c) 2007-2014, Even Rouault <even dot 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_port.h"
#include "cpl_vax.h"
#include "rawdataset.h"
#include <climits>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <algorithm>
#include <limits>
#include <vector>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_progress.h"
#include "cpl_string.h"
#include "cpl_virtualmem.h"
#include "cpl_vsi.h"
#include "cpl_safemaths.hpp"
#include "gdal.h"
#include "gdal_priv.h"
/************************************************************************/
/* RawRasterBand() */
/************************************************************************/
RawRasterBand::RawRasterBand(GDALDataset *poDSIn, int nBandIn,
VSILFILE *fpRawLIn, vsi_l_offset nImgOffsetIn,
int nPixelOffsetIn, int nLineOffsetIn,
GDALDataType eDataTypeIn, int bNativeOrderIn,
OwnFP bOwnsFPIn)
: RawRasterBand(poDSIn, nBandIn, fpRawLIn, nImgOffsetIn, nPixelOffsetIn,
nLineOffsetIn, eDataTypeIn,
#ifdef CPL_LSB
bNativeOrderIn ? ByteOrder::ORDER_LITTLE_ENDIAN
: ByteOrder::ORDER_BIG_ENDIAN,
#else
bNativeOrderIn ? ByteOrder::ORDER_BIG_ENDIAN
: ByteOrder::ORDER_LITTLE_ENDIAN,
#endif
bOwnsFPIn)
{
}
/************************************************************************/
/* RawRasterBand() */
/************************************************************************/
RawRasterBand::RawRasterBand(GDALDataset *poDSIn, int nBandIn,
VSILFILE *fpRawLIn, vsi_l_offset nImgOffsetIn,
int nPixelOffsetIn, int nLineOffsetIn,
GDALDataType eDataTypeIn, ByteOrder eByteOrderIn,
OwnFP bOwnsFPIn)
: fpRawL(fpRawLIn), nImgOffset(nImgOffsetIn), nPixelOffset(nPixelOffsetIn),
nLineOffset(nLineOffsetIn), eByteOrder(eByteOrderIn),
bOwnsFP(bOwnsFPIn == OwnFP::YES)
{
poDS = poDSIn;
nBand = nBandIn;
eDataType = eDataTypeIn;
nRasterXSize = poDSIn->GetRasterXSize();
nRasterYSize = poDSIn->GetRasterYSize();
CPLDebug("GDALRaw",
"RawRasterBand(%p,%d,%p,\n"
" Off=%d,PixOff=%d,LineOff=%d,%s,%d)",
poDS, nBand, fpRawL, static_cast<unsigned int>(nImgOffset),
nPixelOffset, nLineOffset, GDALGetDataTypeName(eDataType),
static_cast<int>(eByteOrder));
// Treat one scanline as the block size.
nBlockXSize = poDS->GetRasterXSize();
nBlockYSize = 1;
// Initialize other fields, and setup the line buffer.
Initialize();
}
/************************************************************************/
/* RawRasterBand::Create() */
/************************************************************************/
std::unique_ptr<RawRasterBand>
RawRasterBand::Create(GDALDataset *poDSIn, int nBandIn, VSILFILE *fpRawLIn,
vsi_l_offset nImgOffsetIn, int nPixelOffsetIn,
int nLineOffsetIn, GDALDataType eDataTypeIn,
ByteOrder eByteOrderIn, OwnFP bOwnsFPIn)
{
auto poBand = cpl::make_unique<RawRasterBand>(
poDSIn, nBandIn, fpRawLIn, nImgOffsetIn, nPixelOffsetIn, nLineOffsetIn,
eDataTypeIn, eByteOrderIn, bOwnsFPIn);
if (!poBand->IsValid())
return nullptr;
return poBand;
}
/************************************************************************/
/* RawRasterBand() */
/************************************************************************/
RawRasterBand::RawRasterBand(VSILFILE *fpRawLIn, vsi_l_offset nImgOffsetIn,
int nPixelOffsetIn, int nLineOffsetIn,
GDALDataType eDataTypeIn, int bNativeOrderIn,
int nXSize, int nYSize, OwnFP bOwnsFPIn)
: RawRasterBand(fpRawLIn, nImgOffsetIn, nPixelOffsetIn, nLineOffsetIn,
eDataTypeIn,
#ifdef CPL_LSB
bNativeOrderIn ? ByteOrder::ORDER_LITTLE_ENDIAN
: ByteOrder::ORDER_BIG_ENDIAN,
#else
bNativeOrderIn ? ByteOrder::ORDER_BIG_ENDIAN
: ByteOrder::ORDER_LITTLE_ENDIAN,
#endif
nXSize, nYSize, bOwnsFPIn)
{
}
/************************************************************************/
/* RawRasterBand::Create() */
/************************************************************************/
std::unique_ptr<RawRasterBand>
RawRasterBand::Create(VSILFILE *fpRawIn, vsi_l_offset nImgOffsetIn,
int nPixelOffsetIn, int nLineOffsetIn,
GDALDataType eDataTypeIn, ByteOrder eByteOrderIn,
int nXSizeIn, int nYSizeIn, OwnFP bOwnsFPIn)
{
auto poBand = cpl::make_unique<RawRasterBand>(
fpRawIn, nImgOffsetIn, nPixelOffsetIn, nLineOffsetIn, eDataTypeIn,
eByteOrderIn, nXSizeIn, nYSizeIn, bOwnsFPIn);
if (!poBand->IsValid())
return nullptr;
return poBand;
}
/************************************************************************/
/* RawRasterBand() */
/************************************************************************/
RawRasterBand::RawRasterBand(VSILFILE *fpRawLIn, vsi_l_offset nImgOffsetIn,
int nPixelOffsetIn, int nLineOffsetIn,
GDALDataType eDataTypeIn, ByteOrder eByteOrderIn,
int nXSize, int nYSize, OwnFP bOwnsFPIn)
: fpRawL(fpRawLIn), nImgOffset(nImgOffsetIn), nPixelOffset(nPixelOffsetIn),
nLineOffset(nLineOffsetIn), eByteOrder(eByteOrderIn),
bOwnsFP(bOwnsFPIn == OwnFP::YES)
{
poDS = nullptr;
nBand = 1;
eDataType = eDataTypeIn;
CPLDebug("GDALRaw",
"RawRasterBand(floating,Off=%d,PixOff=%d,LineOff=%d,%s,%d)",
static_cast<unsigned int>(nImgOffset), nPixelOffset, nLineOffset,
GDALGetDataTypeName(eDataType), static_cast<int>(eByteOrder));
// Treat one scanline as the block size.
nBlockXSize = nXSize;
nBlockYSize = 1;
nRasterXSize = nXSize;
nRasterYSize = nYSize;
if (!GDALCheckDatasetDimensions(nXSize, nYSize))
{
return;
}
// Initialize other fields, and setup the line buffer.
Initialize();
}
/************************************************************************/
/* Initialize() */
/************************************************************************/
void RawRasterBand::Initialize()
{
vsi_l_offset nSmallestOffset = nImgOffset;
vsi_l_offset nLargestOffset = nImgOffset;
if (nLineOffset < 0)
{
const auto nDelta =
static_cast<vsi_l_offset>(-static_cast<GIntBig>(nLineOffset)) *
(nRasterYSize - 1);
if (nDelta > nImgOffset)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Inconsistent nLineOffset, nRasterYSize and nImgOffset");
return;
}
nSmallestOffset -= nDelta;
}
else
{
if (nImgOffset >
std::numeric_limits<vsi_l_offset>::max() -
static_cast<vsi_l_offset>(nLineOffset) * (nRasterYSize - 1))
{
CPLError(CE_Failure, CPLE_AppDefined,
"Inconsistent nLineOffset, nRasterYSize and nImgOffset");
return;
}
nLargestOffset +=
static_cast<vsi_l_offset>(nLineOffset) * (nRasterYSize - 1);
}
if (nPixelOffset < 0)
{
if (static_cast<vsi_l_offset>(-static_cast<GIntBig>(nPixelOffset)) *
(nRasterXSize - 1) >
nSmallestOffset)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Inconsistent nPixelOffset, nRasterXSize and nImgOffset");
return;
}
}
else
{
if (nLargestOffset >
std::numeric_limits<vsi_l_offset>::max() -
static_cast<vsi_l_offset>(nPixelOffset) * (nRasterXSize - 1))
{
CPLError(CE_Failure, CPLE_AppDefined,
"Inconsistent nPixelOffset, nRasterXSize and nImgOffset");
return;
}
nLargestOffset +=
static_cast<vsi_l_offset>(nPixelOffset) * (nRasterXSize - 1);
}
if (nLargestOffset > static_cast<vsi_l_offset>(GINTBIG_MAX))
{
CPLError(CE_Failure, CPLE_AppDefined, "Too big largest offset");
return;
}
const int nDTSize = GDALGetDataTypeSizeBytes(GetRasterDataType());
// Allocate working scanline.
const bool bIsBIP = IsBIP();
if (bIsBIP)
{
if (nBand == 1)
{
nLineSize = nPixelOffset * nBlockXSize;
pLineBuffer = VSIMalloc(nLineSize);
}
else
{
// Band > 1 : share the same buffer as band 1
pLineBuffer = nullptr;
const auto poFirstBand =
cpl::down_cast<RawRasterBand *>(poDS->GetRasterBand(1));
if (poFirstBand->pLineBuffer != nullptr)
pLineStart = static_cast<char *>(poFirstBand->pLineBuffer) +
(nBand - 1) * nDTSize;
return;
}
}
else if (nBlockXSize <= 0 ||
(nBlockXSize > 1 &&
std::abs(nPixelOffset) >
std::numeric_limits<int>::max() / (nBlockXSize - 1)) ||
std::abs(nPixelOffset) * (nBlockXSize - 1) >
std::numeric_limits<int>::max() - nDTSize)
{
nLineSize = 0;
pLineBuffer = nullptr;
}
else
{
nLineSize = std::abs(nPixelOffset) * (nBlockXSize - 1) + nDTSize;
pLineBuffer = VSIMalloc(nLineSize);
}
if (pLineBuffer == nullptr)
{
nLineSize = 0;
CPLError(CE_Failure, CPLE_AppDefined,
"Could not allocate line buffer: "
"nPixelOffset=%d, nBlockXSize=%d",
nPixelOffset, nBlockXSize);
return;
}
if (nPixelOffset >= 0)
pLineStart = pLineBuffer;
else
pLineStart = static_cast<char *>(pLineBuffer) +
static_cast<std::ptrdiff_t>(std::abs(nPixelOffset)) *
(nBlockXSize - 1);
}
/************************************************************************/
/* ~RawRasterBand() */
/************************************************************************/
RawRasterBand::~RawRasterBand()
{
if (poCT)
delete poCT;
CSLDestroy(papszCategoryNames);
RawRasterBand::FlushCache(true);
if (bOwnsFP)
{
if (VSIFCloseL(fpRawL) != 0)
{
CPLError(CE_Failure, CPLE_FileIO, "I/O error");
}
}
CPLFree(pLineBuffer);
}
/************************************************************************/
/* IsBIP() */
/************************************************************************/
bool RawRasterBand::IsBIP() const
{
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
const bool bIsRawDataset = dynamic_cast<RawDataset *>(poDS) != nullptr;
if (bIsRawDataset && nPixelOffset > nDTSize &&
nLineOffset == static_cast<int64_t>(nPixelOffset) * nRasterXSize)
{
if (nBand == 1)
{
return true;
}
const auto poFirstBand =
dynamic_cast<RawRasterBand *>(poDS->GetRasterBand(1));
if (poFirstBand && eDataType == poFirstBand->eDataType &&
eByteOrder == poFirstBand->eByteOrder &&
nPixelOffset == poFirstBand->nPixelOffset &&
nLineOffset == poFirstBand->nLineOffset &&
nImgOffset == poFirstBand->nImgOffset + (nBand - 1) * nDTSize)
{
return true;
}
}
return false;
}
/************************************************************************/
/* SetAccess() */
/************************************************************************/
void RawRasterBand::SetAccess(GDALAccess eAccessIn)
{
eAccess = eAccessIn;
}
/************************************************************************/
/* FlushCache() */
/* */
/* We override this so we have the opportunity to call */
/* fflush(). We don't want to do this all the time in the */
/* write block function as it is kind of expensive. */
/************************************************************************/
CPLErr RawRasterBand::FlushCache(bool bAtClosing)
{
CPLErr eErr = GDALRasterBand::FlushCache(bAtClosing);
if (eErr != CE_None)
{
bNeedFileFlush = false;
return eErr;
}
RawRasterBand *masterBand = this;
if (nBand > 1 && poDS != nullptr && poDS->GetRasterCount() > 1 && IsBIP())
{
// can't be null as IsBIP() checks that the first band is not null,
// which could happen during dataset destruction.
masterBand = cpl::down_cast<RawRasterBand *>(poDS->GetRasterBand(1));
}
if (!masterBand->FlushCurrentLine(false))
{
masterBand->bNeedFileFlush = false;
bNeedFileFlush = false;
return CE_Failure;
}
// If we have unflushed raw, flush it to disk now.
if (masterBand->bNeedFileFlush)
{
int nRet = VSIFFlushL(fpRawL);
masterBand->bNeedFileFlush = false;
bNeedFileFlush = false;
if (nRet < 0)
return CE_Failure;
}
bNeedFileFlush = false;
return CE_None;
}
/************************************************************************/
/* NeedsByteOrderChange() */
/************************************************************************/
bool RawRasterBand::NeedsByteOrderChange() const
{
#ifdef CPL_LSB
return eDataType != GDT_Byte &&
eByteOrder != RawRasterBand::ByteOrder::ORDER_LITTLE_ENDIAN;
#else
return eDataType != GDT_Byte &&
eByteOrder != RawRasterBand::ByteOrder::ORDER_BIG_ENDIAN;
#endif
}
/************************************************************************/
/* DoByteSwap() */
/************************************************************************/
void RawRasterBand::DoByteSwap(void *pBuffer, size_t nValues, int nByteSkip,
bool bDiskToCPU) const
{
if (eByteOrder != RawRasterBand::ByteOrder::ORDER_VAX)
{
if (GDALDataTypeIsComplex(eDataType))
{
const int nWordSize = GDALGetDataTypeSize(eDataType) / 16;
GDALSwapWordsEx(pBuffer, nWordSize, nValues, nByteSkip);
GDALSwapWordsEx(static_cast<GByte *>(pBuffer) + nWordSize,
nWordSize, nValues, nByteSkip);
}
else
{
GDALSwapWordsEx(pBuffer, GDALGetDataTypeSizeBytes(eDataType),
nValues, nByteSkip);
}
}
else if (eDataType == GDT_Float32 || eDataType == GDT_CFloat32)
{
GByte *pPtr = static_cast<GByte *>(pBuffer);
for (int k = 0; k < 2; k++)
{
if (bDiskToCPU)
{
for (size_t i = 0; i < nValues; i++, pPtr += nByteSkip)
{
CPLVaxToIEEEFloat(pPtr);
}
}
else
{
for (size_t i = 0; i < nValues; i++, pPtr += nByteSkip)
{
CPLIEEEToVaxFloat(pPtr);
}
}
if (k == 0 && eDataType == GDT_CFloat32)
pPtr = static_cast<GByte *>(pBuffer) + sizeof(float);
else
break;
}
}
else if (eDataType == GDT_Float64 || eDataType == GDT_CFloat64)
{
GByte *pPtr = static_cast<GByte *>(pBuffer);
for (int k = 0; k < 2; k++)
{
if (bDiskToCPU)
{
for (size_t i = 0; i < nValues; i++, pPtr += nByteSkip)
{
CPLVaxToIEEEDouble(pPtr);
}
}
else
{
for (size_t i = 0; i < nValues; i++, pPtr += nByteSkip)
{
CPLIEEEToVaxDouble(pPtr);
}
}
if (k == 0 && eDataType == GDT_CFloat64)
pPtr = static_cast<GByte *>(pBuffer) + sizeof(double);
else
break;
}
}
}
/************************************************************************/
/* ComputeFileOffset() */
/************************************************************************/
vsi_l_offset RawRasterBand::ComputeFileOffset(int iLine) const
{
// Write formulas such that unsigned int overflow doesn't occur
vsi_l_offset nOffset = nImgOffset;
if (nLineOffset >= 0)
{
nOffset += static_cast<GUIntBig>(nLineOffset) * iLine;
}
else
{
nOffset -=
static_cast<GUIntBig>(-static_cast<GIntBig>(nLineOffset)) * iLine;
}
if (nPixelOffset < 0)
{
const GUIntBig nPixelOffsetToSubtract =
static_cast<GUIntBig>(-static_cast<GIntBig>(nPixelOffset)) *
(nBlockXSize - 1);
nOffset -= nPixelOffsetToSubtract;
}
return nOffset;
}
/************************************************************************/
/* AccessLine() */
/************************************************************************/
CPLErr RawRasterBand::AccessLine(int iLine)
{
if (pLineBuffer == nullptr)
{
if (nBand > 1 && pLineStart != nullptr)
{
// BIP interleaved
auto poFirstBand =
cpl::down_cast<RawRasterBand *>(poDS->GetRasterBand(1));
CPLAssert(poFirstBand);
return poFirstBand->AccessLine(iLine);
}
return CE_Failure;
}
if (nLoadedScanline == iLine)
{
return CE_None;
}
if (!FlushCurrentLine(false))
{
return CE_Failure;
}
// Figure out where to start reading.
const vsi_l_offset nReadStart = ComputeFileOffset(iLine);
// Seek to the correct line.
if (Seek(nReadStart, SEEK_SET) == -1)
{
if (poDS != nullptr && poDS->GetAccess() == GA_ReadOnly)
{
CPLError(CE_Failure, CPLE_FileIO,
"Failed to seek to scanline %d @ " CPL_FRMT_GUIB ".",
iLine, nReadStart);
return CE_Failure;
}
else
{
memset(pLineBuffer, 0, nLineSize);
nLoadedScanline = iLine;
return CE_None;
}
}
// Read the line. Take care not to request any more bytes than
// are needed, and not to lose a partially successful scanline read.
const size_t nBytesToRead = nLineSize;
const size_t nBytesActuallyRead = Read(pLineBuffer, 1, nBytesToRead);
if (nBytesActuallyRead < nBytesToRead)
{
if (poDS != nullptr && poDS->GetAccess() == GA_ReadOnly &&
// ENVI datasets might be sparse (see #915)
poDS->GetMetadata("ENVI") == nullptr)
{
CPLError(CE_Failure, CPLE_FileIO, "Failed to read scanline %d.",
iLine);
return CE_Failure;
}
else
{
memset(static_cast<GByte *>(pLineBuffer) + nBytesActuallyRead, 0,
nBytesToRead - nBytesActuallyRead);
}
}
// Byte swap the interesting data, if required.
if (NeedsByteOrderChange())
{
if (poDS != nullptr && poDS->GetRasterCount() > 1 && IsBIP())
{
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
DoByteSwap(pLineBuffer, nBlockXSize * poDS->GetRasterCount(),
nDTSize, true);
}
else
DoByteSwap(pLineBuffer, nBlockXSize, std::abs(nPixelOffset), true);
}
nLoadedScanline = iLine;
return CE_None;
}
/************************************************************************/
/* IReadBlock() */
/************************************************************************/
CPLErr RawRasterBand::IReadBlock(CPL_UNUSED int nBlockXOff, int nBlockYOff,
void *pImage)
{
CPLAssert(nBlockXOff == 0);
const CPLErr eErr = AccessLine(nBlockYOff);
if (eErr == CE_Failure)
return eErr;
// Copy data from disk buffer to user block buffer.
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
GDALCopyWords(pLineStart, eDataType, nPixelOffset, pImage, eDataType,
nDTSize, nBlockXSize);
// Pre-cache block cache of other bands
if (poDS != nullptr && poDS->GetRasterCount() > 1 && IsBIP())
{
for (int iBand = 1; iBand <= poDS->GetRasterCount(); iBand++)
{
if (iBand != nBand)
{
auto poOtherBand =
cpl::down_cast<RawRasterBand *>(poDS->GetRasterBand(iBand));
GDALRasterBlock *poBlock =
poOtherBand->TryGetLockedBlockRef(0, nBlockYOff);
if (poBlock != nullptr)
{
poBlock->DropLock();
continue;
}
poBlock = poOtherBand->GetLockedBlockRef(0, nBlockYOff, true);
if (poBlock != nullptr)
{
GDALCopyWords(poOtherBand->pLineStart, eDataType,
nPixelOffset, poBlock->GetDataRef(),
eDataType, nDTSize, nBlockXSize);
poBlock->DropLock();
}
}
}
}
return eErr;
}
/************************************************************************/
/* BIPWriteBlock() */
/************************************************************************/
CPLErr RawRasterBand::BIPWriteBlock(int nBlockYOff, int nCallingBand,
const void *pImage)
{
if (nLoadedScanline != nBlockYOff)
{
if (!FlushCurrentLine(false))
return CE_Failure;
}
const int nBands = poDS->GetRasterCount();
std::vector<GDALRasterBlock *> apoBlocks(nBands);
bool bAllBlocksDirty = true;
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
/* -------------------------------------------------------------------- */
/* If all blocks are cached and dirty then we do not need to reload */
/* the scanline from disk */
/* -------------------------------------------------------------------- */
for (int iBand = 0; iBand < nBands; ++iBand)
{
if (iBand + 1 != nCallingBand)
{
apoBlocks[iBand] =
cpl::down_cast<RawRasterBand *>(poDS->GetRasterBand(iBand + 1))
->TryGetLockedBlockRef(0, nBlockYOff);
if (apoBlocks[iBand] == nullptr)
{
bAllBlocksDirty = false;
}
else if (!apoBlocks[iBand]->GetDirty())
{
apoBlocks[iBand]->DropLock();
apoBlocks[iBand] = nullptr;
bAllBlocksDirty = false;
}
}
else
apoBlocks[iBand] = nullptr;
}
if (!bAllBlocksDirty)
{
// We only to read the scanline if we don't have data for all bands.
if (AccessLine(nBlockYOff) != CE_None)
{
for (int iBand = 0; iBand < nBands; ++iBand)
{
if (apoBlocks[iBand] != nullptr)
apoBlocks[iBand]->DropLock();
}
return CE_Failure;
}
}
for (int iBand = 0; iBand < nBands; ++iBand)
{
const GByte *pabyThisImage = nullptr;
GDALRasterBlock *poBlock = nullptr;
if (iBand + 1 == nCallingBand)
{
pabyThisImage = static_cast<const GByte *>(pImage);
}
else
{
poBlock = apoBlocks[iBand];
if (poBlock == nullptr)
continue;
if (!poBlock->GetDirty())
{
poBlock->DropLock();
continue;
}
pabyThisImage = static_cast<const GByte *>(poBlock->GetDataRef());
}
GByte *pabyOut = static_cast<GByte *>(pLineStart) + iBand * nDTSize;
GDALCopyWords(pabyThisImage, eDataType, nDTSize, pabyOut, eDataType,
nPixelOffset, nBlockXSize);
if (poBlock != nullptr)
{
poBlock->MarkClean();
poBlock->DropLock();
}
}
nLoadedScanline = nBlockYOff;
bLoadedScanlineDirty = true;
if (bAllBlocksDirty)
{
return FlushCurrentLine(true) ? CE_None : CE_Failure;
}
bNeedFileFlush = true;
return CE_None;
}
/************************************************************************/
/* IWriteBlock() */
/************************************************************************/
CPLErr RawRasterBand::IWriteBlock(CPL_UNUSED int nBlockXOff, int nBlockYOff,
void *pImage)
{
CPLAssert(nBlockXOff == 0);
if (pLineBuffer == nullptr)
{
if (poDS != nullptr && poDS->GetRasterCount() > 1 && IsBIP())
{
auto poFirstBand =
(nBand == 1)
? this
: cpl::down_cast<RawRasterBand *>(poDS->GetRasterBand(1));
CPLAssert(poFirstBand);
return poFirstBand->BIPWriteBlock(nBlockYOff, nBand, pImage);
}
return CE_Failure;
}
if (nLoadedScanline != nBlockYOff)
{
if (!FlushCurrentLine(false))
return CE_Failure;
}
// If the data for this band is completely contiguous, we don't
// have to worry about pre-reading from disk.
CPLErr eErr = CE_None;
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
if (std::abs(nPixelOffset) > nDTSize)
eErr = AccessLine(nBlockYOff);
// Copy data from user buffer into disk buffer.
GDALCopyWords(pImage, eDataType, nDTSize, pLineStart, eDataType,
nPixelOffset, nBlockXSize);
nLoadedScanline = nBlockYOff;
bLoadedScanlineDirty = true;
return eErr == CE_None && FlushCurrentLine(true) ? CE_None : CE_Failure;
}
/************************************************************************/
/* FlushCurrentLine() */
/************************************************************************/
bool RawRasterBand::FlushCurrentLine(bool bNeedUsableBufferAfter)
{
if (!bLoadedScanlineDirty)
return true;
bLoadedScanlineDirty = false;
bool ok = true;
// Byte swap (if necessary) back into disk order before writing.
if (NeedsByteOrderChange())
{
if (poDS != nullptr && poDS->GetRasterCount() > 1 && IsBIP())
{
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
DoByteSwap(pLineBuffer, nBlockXSize * poDS->GetRasterCount(),
nDTSize, false);
}
else
DoByteSwap(pLineBuffer, nBlockXSize, std::abs(nPixelOffset), false);
}
// Figure out where to start reading.
const vsi_l_offset nWriteStart = ComputeFileOffset(nLoadedScanline);
// Seek to correct location.
if (Seek(nWriteStart, SEEK_SET) == -1)
{
CPLError(CE_Failure, CPLE_FileIO,
"Failed to seek to scanline %d @ " CPL_FRMT_GUIB
" to write to file.",
nLoadedScanline, nWriteStart);
ok = false;
}
// Write data buffer.
const int nBytesToWrite = nLineSize;
if (ok && Write(pLineBuffer, 1, nBytesToWrite) <
static_cast<size_t>(nBytesToWrite))
{
CPLError(CE_Failure, CPLE_FileIO,
"Failed to write scanline %d to file.", nLoadedScanline);
ok = false;
}
// Byte swap (if necessary) back into machine order so the
// buffer is still usable for reading purposes, unless this is not needed.
if (bNeedUsableBufferAfter && NeedsByteOrderChange())
{
if (poDS != nullptr && poDS->GetRasterCount() > 1 && IsBIP())
{
const int nDTSize = GDALGetDataTypeSizeBytes(eDataType);
DoByteSwap(pLineBuffer, nBlockXSize * poDS->GetRasterCount(),
nDTSize, true);
}
else
DoByteSwap(pLineBuffer, nBlockXSize, std::abs(nPixelOffset), true);
}
bNeedFileFlush = true;
return ok;
}
/************************************************************************/
/* AccessBlock() */
/************************************************************************/
CPLErr RawRasterBand::AccessBlock(vsi_l_offset nBlockOff, size_t nBlockSize,
void *pData, size_t nValues)
{
// Seek to the correct block.
if (Seek(nBlockOff, SEEK_SET) == -1)
{
memset(pData, 0, nBlockSize);
return CE_None;
}
// Read the block.
const size_t nBytesActuallyRead = Read(pData, 1, nBlockSize);
if (nBytesActuallyRead < nBlockSize)
{
memset(static_cast<GByte *>(pData) + nBytesActuallyRead, 0,
nBlockSize - nBytesActuallyRead);
}
// Byte swap the interesting data, if required.
if (NeedsByteOrderChange())
{
DoByteSwap(pData, nValues, std::abs(nPixelOffset), true);
}
return CE_None;
}
/************************************************************************/
/* IsSignificantNumberOfLinesLoaded() */
/* */
/* Check if there is a significant number of scanlines (>20%) from the */
/* specified block of lines already cached. */
/************************************************************************/
int RawRasterBand::IsSignificantNumberOfLinesLoaded(int nLineOff, int nLines)
{
int nCountLoaded = 0;
for (int iLine = nLineOff; iLine < nLineOff + nLines; iLine++)
{
GDALRasterBlock *poBlock = TryGetLockedBlockRef(0, iLine);
if (poBlock != nullptr)
{
poBlock->DropLock();
nCountLoaded++;
if (nCountLoaded > nLines / 20)
{
return TRUE;
}
}
}
return FALSE;
}
/************************************************************************/
/* CanUseDirectIO() */
/************************************************************************/
int RawRasterBand::CanUseDirectIO(int /* nXOff */, int nYOff, int nXSize,
int nYSize, GDALDataType /* eBufType*/,
GDALRasterIOExtraArg *psExtraArg)
{
bool result = FALSE;
// Use direct IO without caching if:
//
// GDAL_ONE_BIG_READ is enabled
//
// or
//
// the raster width is so small that the cost of a GDALRasterBlock is
// significant
//
// or
//
// the length of a scanline on disk is more than 50000 bytes, and the
// width of the requested chunk is less than 40% of the whole scanline and