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hf2dataset.cpp
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/******************************************************************************
*
* Project: HF2 driver
* Purpose: GDALDataset driver for HF2/HFZ dataset.
* Author: Even Rouault, <even dot rouault at spatialys.com>
*
******************************************************************************
* Copyright (c) 2010-2012, 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_string.h"
#include "gdal_frmts.h"
#include "gdal_pam.h"
#include "ogr_spatialref.h"
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <limits>
/************************************************************************/
/* ==================================================================== */
/* HF2Dataset */
/* ==================================================================== */
/************************************************************************/
class HF2RasterBand;
class HF2Dataset final : public GDALPamDataset
{
friend class HF2RasterBand;
VSILFILE *fp;
double adfGeoTransform[6];
OGRSpatialReference m_oSRS{};
vsi_l_offset *panBlockOffset; // tile 0 is a the bottom left
int nTileSize;
int bHasLoaderBlockMap;
int LoadBlockMap();
public:
HF2Dataset();
virtual ~HF2Dataset();
virtual CPLErr GetGeoTransform(double *) override;
const OGRSpatialReference *GetSpatialRef() const override;
static GDALDataset *Open(GDALOpenInfo *);
static int Identify(GDALOpenInfo *);
static GDALDataset *CreateCopy(const char *pszFilename,
GDALDataset *poSrcDS, int bStrict,
char **papszOptions,
GDALProgressFunc pfnProgress,
void *pProgressData);
};
/************************************************************************/
/* ==================================================================== */
/* HF2RasterBand */
/* ==================================================================== */
/************************************************************************/
class HF2RasterBand final : public GDALPamRasterBand
{
friend class HF2Dataset;
float *pafBlockData;
int nLastBlockYOffFromBottom;
public:
HF2RasterBand(HF2Dataset *, int, GDALDataType);
virtual ~HF2RasterBand();
virtual CPLErr IReadBlock(int, int, void *) override;
};
/************************************************************************/
/* HF2RasterBand() */
/************************************************************************/
HF2RasterBand::HF2RasterBand(HF2Dataset *poDSIn, int nBandIn, GDALDataType eDT)
: pafBlockData(nullptr), nLastBlockYOffFromBottom(-1)
{
poDS = poDSIn;
nBand = nBandIn;
eDataType = eDT;
nBlockXSize = poDSIn->nTileSize;
nBlockYSize = 1;
}
/************************************************************************/
/* ~HF2RasterBand() */
/************************************************************************/
HF2RasterBand::~HF2RasterBand()
{
CPLFree(pafBlockData);
}
/************************************************************************/
/* IReadBlock() */
/************************************************************************/
CPLErr HF2RasterBand::IReadBlock(int nBlockXOff, int nLineYOff, void *pImage)
{
HF2Dataset *poGDS = (HF2Dataset *)poDS;
const int nXBlocks = DIV_ROUND_UP(nRasterXSize, poGDS->nTileSize);
if (!poGDS->LoadBlockMap())
return CE_Failure;
const int nMaxTileHeight = std::min(poGDS->nTileSize, nRasterYSize);
if (pafBlockData == nullptr)
{
if (nMaxTileHeight > 10 * 1024 * 1024 / nRasterXSize)
{
VSIFSeekL(poGDS->fp, 0, SEEK_END);
vsi_l_offset nSize = VSIFTellL(poGDS->fp);
if (nSize <
static_cast<vsi_l_offset>(nMaxTileHeight) * nRasterXSize)
{
CPLError(CE_Failure, CPLE_FileIO, "File too short");
return CE_Failure;
}
}
pafBlockData =
(float *)VSIMalloc3(sizeof(float), nRasterXSize, nMaxTileHeight);
if (pafBlockData == nullptr)
return CE_Failure;
}
const int nLineYOffFromBottom = nRasterYSize - 1 - nLineYOff;
const int nBlockYOffFromBottom = nLineYOffFromBottom / nBlockXSize;
const int nYOffInTile = nLineYOffFromBottom % nBlockXSize;
if (nBlockYOffFromBottom != nLastBlockYOffFromBottom)
{
nLastBlockYOffFromBottom = nBlockYOffFromBottom;
memset(pafBlockData, 0, sizeof(float) * nRasterXSize * nMaxTileHeight);
/* 4 * nBlockXSize is the upper bound */
void *pabyData = CPLMalloc(4 * nBlockXSize);
for (int nxoff = 0; nxoff < nXBlocks; nxoff++)
{
VSIFSeekL(
poGDS->fp,
poGDS->panBlockOffset[nBlockYOffFromBottom * nXBlocks + nxoff],
SEEK_SET);
float fScale, fOff;
VSIFReadL(&fScale, 4, 1, poGDS->fp);
VSIFReadL(&fOff, 4, 1, poGDS->fp);
CPL_LSBPTR32(&fScale);
CPL_LSBPTR32(&fOff);
const int nTileWidth =
std::min(nBlockXSize, nRasterXSize - nxoff * nBlockXSize);
const int nTileHeight = std::min(
nBlockXSize, nRasterYSize - nBlockYOffFromBottom * nBlockXSize);
for (int j = 0; j < nTileHeight; j++)
{
GByte nWordSize;
VSIFReadL(&nWordSize, 1, 1, poGDS->fp);
if (nWordSize != 1 && nWordSize != 2 && nWordSize != 4)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Unexpected word size : %d", (int)nWordSize);
break;
}
GInt32 nVal;
VSIFReadL(&nVal, 4, 1, poGDS->fp);
CPL_LSBPTR32(&nVal);
const size_t nToRead =
static_cast<size_t>(nWordSize * (nTileWidth - 1));
const size_t nRead = VSIFReadL(pabyData, 1, nToRead, poGDS->fp);
if (nRead != nToRead)
{
CPLError(CE_Failure, CPLE_FileIO,
"File too short: got %d, expected %d",
static_cast<int>(nRead),
static_cast<int>(nToRead));
CPLFree(pabyData);
return CE_Failure;
}
#if defined(CPL_MSB)
if (nWordSize > 1)
GDALSwapWords(pabyData, nWordSize, nTileWidth - 1,
nWordSize);
#endif
double dfVal = nVal * (double)fScale + fOff;
if (dfVal > std::numeric_limits<float>::max())
dfVal = std::numeric_limits<float>::max();
else if (dfVal < std::numeric_limits<float>::min())
dfVal = std::numeric_limits<float>::min();
pafBlockData[nxoff * nBlockXSize + j * nRasterXSize + 0] =
static_cast<float>(dfVal);
for (int i = 1; i < nTileWidth; i++)
{
int nInc;
if (nWordSize == 1)
nInc = ((signed char *)pabyData)[i - 1];
else if (nWordSize == 2)
nInc = ((GInt16 *)pabyData)[i - 1];
else
nInc = ((GInt32 *)pabyData)[i - 1];
if ((nInc >= 0 && nVal > INT_MAX - nInc) ||
(nInc == INT_MIN && nVal < 0) ||
(nInc < 0 && nVal < INT_MIN - nInc))
{
CPLError(CE_Failure, CPLE_FileIO, "int32 overflow");
CPLFree(pabyData);
return CE_Failure;
}
nVal += nInc;
dfVal = nVal * (double)fScale + fOff;
if (dfVal > std::numeric_limits<float>::max())
dfVal = std::numeric_limits<float>::max();
else if (dfVal < std::numeric_limits<float>::min())
dfVal = std::numeric_limits<float>::min();
pafBlockData[nxoff * nBlockXSize + j * nRasterXSize + i] =
static_cast<float>(dfVal);
}
}
}
CPLFree(pabyData);
}
const int nTileWidth =
std::min(nBlockXSize, nRasterXSize - nBlockXOff * nBlockXSize);
memcpy(pImage,
pafBlockData + nBlockXOff * nBlockXSize + nYOffInTile * nRasterXSize,
nTileWidth * sizeof(float));
return CE_None;
}
/************************************************************************/
/* ~HF2Dataset() */
/************************************************************************/
HF2Dataset::HF2Dataset()
: fp(nullptr), panBlockOffset(nullptr), nTileSize(0),
bHasLoaderBlockMap(FALSE)
{
m_oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
adfGeoTransform[0] = 0;
adfGeoTransform[1] = 1;
adfGeoTransform[2] = 0;
adfGeoTransform[3] = 0;
adfGeoTransform[4] = 0;
adfGeoTransform[5] = 1;
}
/************************************************************************/
/* ~HF2Dataset() */
/************************************************************************/
HF2Dataset::~HF2Dataset()
{
FlushCache(true);
CPLFree(panBlockOffset);
if (fp)
VSIFCloseL(fp);
}
/************************************************************************/
/* LoadBlockMap() */
/************************************************************************/
int HF2Dataset::LoadBlockMap()
{
if (bHasLoaderBlockMap)
return panBlockOffset != nullptr;
bHasLoaderBlockMap = TRUE;
const int nXBlocks = (nRasterXSize + nTileSize - 1) / nTileSize;
const int nYBlocks = (nRasterYSize + nTileSize - 1) / nTileSize;
if (nXBlocks * nYBlocks > 1000000)
{
vsi_l_offset nCurOff = VSIFTellL(fp);
VSIFSeekL(fp, 0, SEEK_END);
vsi_l_offset nSize = VSIFTellL(fp);
VSIFSeekL(fp, nCurOff, SEEK_SET);
// Check that the file is big enough to have 8 bytes per block
if (static_cast<vsi_l_offset>(nXBlocks) * nYBlocks > nSize / 8)
{
return FALSE;
}
}
panBlockOffset =
(vsi_l_offset *)VSIMalloc3(sizeof(vsi_l_offset), nXBlocks, nYBlocks);
if (panBlockOffset == nullptr)
{
return FALSE;
}
for (int j = 0; j < nYBlocks; j++)
{
for (int i = 0; i < nXBlocks; i++)
{
vsi_l_offset nOff = VSIFTellL(fp);
panBlockOffset[j * nXBlocks + i] = nOff;
// VSIFSeekL(fp, 4 + 4, SEEK_CUR);
float fScale, fOff;
VSIFReadL(&fScale, 4, 1, fp);
VSIFReadL(&fOff, 4, 1, fp);
CPL_LSBPTR32(&fScale);
CPL_LSBPTR32(&fOff);
// printf("fScale = %f, fOff = %f\n", fScale, fOff);
const int nCols = std::min(nTileSize, nRasterXSize - nTileSize * i);
const int nLines =
std::min(nTileSize, nRasterYSize - nTileSize * j);
for (int k = 0; k < nLines; k++)
{
GByte nWordSize;
if (VSIFReadL(&nWordSize, 1, 1, fp) != 1)
{
CPLError(CE_Failure, CPLE_FileIO, "File too short");
VSIFree(panBlockOffset);
panBlockOffset = nullptr;
return FALSE;
}
// printf("nWordSize=%d\n", nWordSize);
if (nWordSize == 1 || nWordSize == 2 || nWordSize == 4)
VSIFSeekL(
fp,
static_cast<vsi_l_offset>(4 + nWordSize * (nCols - 1)),
SEEK_CUR);
else
{
CPLError(CE_Failure, CPLE_AppDefined,
"Got unexpected byte depth (%d) for block (%d, "
"%d) line %d",
(int)nWordSize, i, j, k);
VSIFree(panBlockOffset);
panBlockOffset = nullptr;
return FALSE;
}
}
}
}
return TRUE;
}
/************************************************************************/
/* GetSpatialRef() */
/************************************************************************/
const OGRSpatialReference *HF2Dataset::GetSpatialRef() const
{
if (!m_oSRS.IsEmpty())
return &m_oSRS;
return GDALPamDataset::GetSpatialRef();
}
/************************************************************************/
/* Identify() */
/************************************************************************/
int HF2Dataset::Identify(GDALOpenInfo *poOpenInfo)
{
GDALOpenInfo *poOpenInfoToDelete = nullptr;
/* GZipped .hf2 files are common, so automagically open them */
/* if the /vsigzip/ has not been explicitly passed */
CPLString osFilename; // keep in that scope
if ((EQUAL(CPLGetExtension(poOpenInfo->pszFilename), "hfz") ||
(strlen(poOpenInfo->pszFilename) > 6 &&
EQUAL(poOpenInfo->pszFilename + strlen(poOpenInfo->pszFilename) - 6,
"hf2.gz"))) &&
!STARTS_WITH_CI(poOpenInfo->pszFilename, "/vsigzip/"))
{
osFilename = "/vsigzip/";
osFilename += poOpenInfo->pszFilename;
poOpenInfo = poOpenInfoToDelete = new GDALOpenInfo(
osFilename.c_str(), GA_ReadOnly, poOpenInfo->GetSiblingFiles());
}
if (poOpenInfo->nHeaderBytes < 28)
{
delete poOpenInfoToDelete;
return FALSE;
}
if (memcmp(poOpenInfo->pabyHeader, "HF2\0\0\0\0", 6) != 0)
{
delete poOpenInfoToDelete;
return FALSE;
}
delete poOpenInfoToDelete;
return TRUE;
}
/************************************************************************/
/* Open() */
/************************************************************************/
GDALDataset *HF2Dataset::Open(GDALOpenInfo *poOpenInfo)
{
CPLString osOriginalFilename(poOpenInfo->pszFilename);
if (!Identify(poOpenInfo))
return nullptr;
GDALOpenInfo *poOpenInfoToDelete = nullptr;
/* GZipped .hf2 files are common, so automagically open them */
/* if the /vsigzip/ has not been explicitly passed */
CPLString osFilename(poOpenInfo->pszFilename);
if ((EQUAL(CPLGetExtension(poOpenInfo->pszFilename), "hfz") ||
(strlen(poOpenInfo->pszFilename) > 6 &&
EQUAL(poOpenInfo->pszFilename + strlen(poOpenInfo->pszFilename) - 6,
"hf2.gz"))) &&
!STARTS_WITH_CI(poOpenInfo->pszFilename, "/vsigzip/"))
{
osFilename = "/vsigzip/";
osFilename += poOpenInfo->pszFilename;
poOpenInfo = poOpenInfoToDelete = new GDALOpenInfo(
osFilename.c_str(), GA_ReadOnly, poOpenInfo->GetSiblingFiles());
}
/* -------------------------------------------------------------------- */
/* Parse header */
/* -------------------------------------------------------------------- */
int nXSize, nYSize;
memcpy(&nXSize, poOpenInfo->pabyHeader + 6, 4);
CPL_LSBPTR32(&nXSize);
memcpy(&nYSize, poOpenInfo->pabyHeader + 10, 4);
CPL_LSBPTR32(&nYSize);
GUInt16 nTileSize;
memcpy(&nTileSize, poOpenInfo->pabyHeader + 14, 2);
CPL_LSBPTR16(&nTileSize);
float fVertPres, fHorizScale;
memcpy(&fVertPres, poOpenInfo->pabyHeader + 16, 4);
CPL_LSBPTR32(&fVertPres);
memcpy(&fHorizScale, poOpenInfo->pabyHeader + 20, 4);
CPL_LSBPTR32(&fHorizScale);
GUInt32 nExtendedHeaderLen;
memcpy(&nExtendedHeaderLen, poOpenInfo->pabyHeader + 24, 4);
CPL_LSBPTR32(&nExtendedHeaderLen);
delete poOpenInfoToDelete;
poOpenInfoToDelete = nullptr;
if (nTileSize < 8)
return nullptr;
if (nXSize <= 0 || nXSize > INT_MAX - nTileSize || nYSize <= 0 ||
nYSize > INT_MAX - nTileSize)
return nullptr;
/* To avoid later potential int overflows */
if (nExtendedHeaderLen > 1024 * 65536)
return nullptr;
if (!GDALCheckDatasetDimensions(nXSize, nYSize))
{
return nullptr;
}
const int nXBlocks = (nXSize + nTileSize - 1) / nTileSize;
const int nYBlocks = (nYSize + nTileSize - 1) / nTileSize;
if (nXBlocks > INT_MAX / nYBlocks)
{
return nullptr;
}
/* -------------------------------------------------------------------- */
/* Parse extended blocks */
/* -------------------------------------------------------------------- */
VSILFILE *fp = VSIFOpenL(osFilename.c_str(), "rb");
if (fp == nullptr)
return nullptr;
VSIFSeekL(fp, 28, SEEK_SET);
int bHasExtent = FALSE;
double dfMinX = 0.0;
double dfMaxX = 0.0;
double dfMinY = 0.0;
double dfMaxY = 0.0;
int bHasUTMZone = FALSE;
GInt16 nUTMZone = 0;
int bHasEPSGDatumCode = FALSE;
GInt16 nEPSGDatumCode = 0;
int bHasEPSGCode = FALSE;
GInt16 nEPSGCode = 0;
int bHasRelativePrecision = FALSE;
float fRelativePrecision = 0.0f;
char szApplicationName[256] = {0};
GUInt32 nExtendedHeaderOff = 0;
while (nExtendedHeaderOff < nExtendedHeaderLen)
{
char pabyBlockHeader[24];
VSIFReadL(pabyBlockHeader, 24, 1, fp);
char szBlockName[16 + 1];
memcpy(szBlockName, pabyBlockHeader + 4, 16);
szBlockName[16] = 0;
GUInt32 nBlockSize;
memcpy(&nBlockSize, pabyBlockHeader + 20, 4);
CPL_LSBPTR32(&nBlockSize);
if (nBlockSize > 65536)
break;
nExtendedHeaderOff += 24 + nBlockSize;
if (strcmp(szBlockName, "georef-extents") == 0 && nBlockSize == 34)
{
char pabyBlockData[34];
VSIFReadL(pabyBlockData, 34, 1, fp);
memcpy(&dfMinX, pabyBlockData + 2, 8);
CPL_LSBPTR64(&dfMinX);
memcpy(&dfMaxX, pabyBlockData + 2 + 8, 8);
CPL_LSBPTR64(&dfMaxX);
memcpy(&dfMinY, pabyBlockData + 2 + 8 + 8, 8);
CPL_LSBPTR64(&dfMinY);
memcpy(&dfMaxY, pabyBlockData + 2 + 8 + 8 + 8, 8);
CPL_LSBPTR64(&dfMaxY);
bHasExtent = TRUE;
}
else if (strcmp(szBlockName, "georef-utm") == 0 && nBlockSize == 2)
{
VSIFReadL(&nUTMZone, 2, 1, fp);
CPL_LSBPTR16(&nUTMZone);
CPLDebug("HF2", "UTM Zone = %d", nUTMZone);
bHasUTMZone = TRUE;
}
else if (strcmp(szBlockName, "georef-datum") == 0 && nBlockSize == 2)
{
VSIFReadL(&nEPSGDatumCode, 2, 1, fp);
CPL_LSBPTR16(&nEPSGDatumCode);
CPLDebug("HF2", "EPSG Datum Code = %d", nEPSGDatumCode);
bHasEPSGDatumCode = TRUE;
}
else if (strcmp(szBlockName, "georef-epsg-prj") == 0 && nBlockSize == 2)
{
VSIFReadL(&nEPSGCode, 2, 1, fp);
CPL_LSBPTR16(&nEPSGCode);
CPLDebug("HF2", "EPSG Code = %d", nEPSGCode);
bHasEPSGCode = TRUE;
}
else if (strcmp(szBlockName, "precis-rel") == 0 && nBlockSize == 4)
{
VSIFReadL(&fRelativePrecision, 4, 1, fp);
CPL_LSBPTR32(&fRelativePrecision);
bHasRelativePrecision = TRUE;
}
else if (strcmp(szBlockName, "app-name") == 0 &&
nBlockSize < sizeof(szApplicationName))
{
VSIFReadL(szApplicationName, nBlockSize, 1, fp);
szApplicationName[nBlockSize] = 0;
}
else
{
CPLDebug("HF2", "Skipping block %s", szBlockName);
VSIFSeekL(fp, nBlockSize, SEEK_CUR);
}
}
/* -------------------------------------------------------------------- */
/* Create a corresponding GDALDataset. */
/* -------------------------------------------------------------------- */
HF2Dataset *poDS = new HF2Dataset();
poDS->fp = fp;
poDS->nRasterXSize = nXSize;
poDS->nRasterYSize = nYSize;
poDS->nTileSize = nTileSize;
CPLDebug("HF2", "nXSize = %d, nYSize = %d, nTileSize = %d", nXSize, nYSize,
nTileSize);
if (bHasExtent)
{
poDS->adfGeoTransform[0] = dfMinX;
poDS->adfGeoTransform[3] = dfMaxY;
poDS->adfGeoTransform[1] = (dfMaxX - dfMinX) / nXSize;
poDS->adfGeoTransform[5] = -(dfMaxY - dfMinY) / nYSize;
}
else
{
poDS->adfGeoTransform[1] = fHorizScale;
poDS->adfGeoTransform[5] = fHorizScale;
}
if (bHasEPSGCode)
{
poDS->m_oSRS.importFromEPSG(nEPSGCode);
}
else
{
bool bHasSRS = false;
OGRSpatialReference oSRS;
oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
oSRS.SetGeogCS("unknown", "unknown", "unknown", SRS_WGS84_SEMIMAJOR,
SRS_WGS84_INVFLATTENING);
if (bHasEPSGDatumCode)
{
if (nEPSGDatumCode == 23 || nEPSGDatumCode == 6326)
{
bHasSRS = true;
oSRS.SetWellKnownGeogCS("WGS84");
}
else if (nEPSGDatumCode >= 6000)
{
char szName[32];
snprintf(szName, sizeof(szName), "EPSG:%d",
nEPSGDatumCode - 2000);
oSRS.SetWellKnownGeogCS(szName);
bHasSRS = true;
}
}
if (bHasUTMZone && std::abs(nUTMZone) >= 1 && std::abs(nUTMZone) <= 60)
{
bHasSRS = true;
oSRS.SetUTM(std::abs(static_cast<int>(nUTMZone)), nUTMZone > 0);
}
if (bHasSRS)
poDS->m_oSRS = std::move(oSRS);
}
/* -------------------------------------------------------------------- */
/* Create band information objects. */
/* -------------------------------------------------------------------- */
poDS->nBands = 1;
for (int i = 0; i < poDS->nBands; i++)
{
poDS->SetBand(i + 1, new HF2RasterBand(poDS, i + 1, GDT_Float32));
poDS->GetRasterBand(i + 1)->SetUnitType("m");
}
if (szApplicationName[0] != '\0')
poDS->SetMetadataItem("APPLICATION_NAME", szApplicationName);
poDS->SetMetadataItem("VERTICAL_PRECISION",
CPLString().Printf("%f", fVertPres));
if (bHasRelativePrecision)
poDS->SetMetadataItem("RELATIVE_VERTICAL_PRECISION",
CPLString().Printf("%f", fRelativePrecision));
/* -------------------------------------------------------------------- */
/* Initialize any PAM information. */
/* -------------------------------------------------------------------- */
poDS->SetDescription(osOriginalFilename.c_str());
poDS->TryLoadXML();
/* -------------------------------------------------------------------- */
/* Support overviews. */
/* -------------------------------------------------------------------- */
poDS->oOvManager.Initialize(poDS, osOriginalFilename.c_str());
return poDS;
}
/************************************************************************/
/* GetGeoTransform() */
/************************************************************************/
CPLErr HF2Dataset::GetGeoTransform(double *padfTransform)
{
memcpy(padfTransform, adfGeoTransform, 6 * sizeof(double));
return CE_None;
}
static void WriteShort(VSILFILE *fp, GInt16 val)
{
CPL_LSBPTR16(&val);
VSIFWriteL(&val, 2, 1, fp);
}
static void WriteInt(VSILFILE *fp, GInt32 val)
{
CPL_LSBPTR32(&val);
VSIFWriteL(&val, 4, 1, fp);
}
static void WriteFloat(VSILFILE *fp, float val)
{
CPL_LSBPTR32(&val);
VSIFWriteL(&val, 4, 1, fp);
}
static void WriteDouble(VSILFILE *fp, double val)
{
CPL_LSBPTR64(&val);
VSIFWriteL(&val, 8, 1, fp);
}
/************************************************************************/
/* CreateCopy() */
/************************************************************************/
GDALDataset *HF2Dataset::CreateCopy(const char *pszFilename,
GDALDataset *poSrcDS, int bStrict,
char **papszOptions,
GDALProgressFunc pfnProgress,
void *pProgressData)
{
/* -------------------------------------------------------------------- */
/* Some some rudimentary checks */
/* -------------------------------------------------------------------- */
int nBands = poSrcDS->GetRasterCount();
if (nBands == 0)
{
CPLError(
CE_Failure, CPLE_NotSupported,
"HF2 driver does not support source dataset with zero band.\n");
return nullptr;
}
if (nBands != 1)
{
CPLError((bStrict) ? CE_Failure : CE_Warning, CPLE_NotSupported,
"HF2 driver only uses the first band of the dataset.\n");
if (bStrict)
return nullptr;
}
if (pfnProgress && !pfnProgress(0.0, nullptr, pProgressData))
return nullptr;
/* -------------------------------------------------------------------- */
/* Get source dataset info */
/* -------------------------------------------------------------------- */
const int nXSize = poSrcDS->GetRasterXSize();
const int nYSize = poSrcDS->GetRasterYSize();
double adfGeoTransform[6];
poSrcDS->GetGeoTransform(adfGeoTransform);
int bHasGeoTransform =
!(adfGeoTransform[0] == 0 && adfGeoTransform[1] == 1 &&
adfGeoTransform[2] == 0 && adfGeoTransform[3] == 0 &&
adfGeoTransform[4] == 0 && adfGeoTransform[5] == 1);
if (adfGeoTransform[2] != 0 || adfGeoTransform[4] != 0)
{
CPLError(CE_Failure, CPLE_NotSupported,
"HF2 driver does not support CreateCopy() from skewed or "
"rotated dataset.\n");
return nullptr;
}
GDALDataType eSrcDT = poSrcDS->GetRasterBand(1)->GetRasterDataType();
GDALDataType eReqDT;
float fVertPres = (float)0.01;
if (eSrcDT == GDT_Byte || eSrcDT == GDT_Int16)
{
fVertPres = 1;
eReqDT = GDT_Int16;
}
else
eReqDT = GDT_Float32;
/* -------------------------------------------------------------------- */
/* Read creation options */
/* -------------------------------------------------------------------- */
const char *pszCompressed = CSLFetchNameValue(papszOptions, "COMPRESS");
bool bCompress = false;
if (pszCompressed)
bCompress = CPLTestBool(pszCompressed);
const char *pszVerticalPrecision =
CSLFetchNameValue(papszOptions, "VERTICAL_PRECISION");
if (pszVerticalPrecision)
{
fVertPres = (float)CPLAtofM(pszVerticalPrecision);
if (fVertPres <= 0)
{
CPLError(
CE_Warning, CPLE_AppDefined,
"Unsupported value for VERTICAL_PRECISION. Defaulting to 0.01");
fVertPres = (float)0.01;
}
if (eReqDT == GDT_Int16 && fVertPres > 1)
eReqDT = GDT_Float32;
}
const char *pszBlockSize = CSLFetchNameValue(papszOptions, "BLOCKSIZE");
int nTileSize = 256;
if (pszBlockSize)
{
nTileSize = atoi(pszBlockSize);
if (nTileSize < 8 || nTileSize > 4096)
{
CPLError(CE_Warning, CPLE_AppDefined,
"Unsupported value for BLOCKSIZE. Defaulting to 256");
nTileSize = 256;
}
}
/* -------------------------------------------------------------------- */
/* Parse source dataset georeferencing info */
/* -------------------------------------------------------------------- */
int nExtendedHeaderLen = 0;
if (bHasGeoTransform)
nExtendedHeaderLen += 58;
const char *pszProjectionRef = poSrcDS->GetProjectionRef();
int nDatumCode = -2;
int nUTMZone = 0;
int bNorth = FALSE;
int nEPSGCode = 0;
int nExtentUnits = 1;
if (pszProjectionRef != nullptr && pszProjectionRef[0] != '\0')
{
OGRSpatialReference oSRS;
if (oSRS.importFromWkt(pszProjectionRef) == OGRERR_NONE)
{
const char *pszValue = nullptr;
if (oSRS.GetAuthorityName("GEOGCS|DATUM") != nullptr &&
EQUAL(oSRS.GetAuthorityName("GEOGCS|DATUM"), "EPSG"))
nDatumCode = atoi(oSRS.GetAuthorityCode("GEOGCS|DATUM"));
else if ((pszValue = oSRS.GetAttrValue("GEOGCS|DATUM")) != nullptr)
{
if (strstr(pszValue, "WGS") && strstr(pszValue, "84"))
nDatumCode = 6326;
}
nUTMZone = oSRS.GetUTMZone(&bNorth);
}
if (oSRS.GetAuthorityName("PROJCS") != nullptr &&
EQUAL(oSRS.GetAuthorityName("PROJCS"), "EPSG"))
nEPSGCode = atoi(oSRS.GetAuthorityCode("PROJCS"));
if (oSRS.IsGeographic())
{
nExtentUnits = 0;
}
else
{
const double dfLinear = oSRS.GetLinearUnits();
if (std::abs(dfLinear - 0.3048) < 0.0000001)
nExtentUnits = 2;
else if (std::abs(dfLinear - CPLAtof(SRS_UL_US_FOOT_CONV)) <
0.00000001)
nExtentUnits = 3;
else
nExtentUnits = 1;
}
}
if (nDatumCode != -2)
nExtendedHeaderLen += 26;
if (nUTMZone != 0)
nExtendedHeaderLen += 26;
if (nEPSGCode)
nExtendedHeaderLen += 26;
/* -------------------------------------------------------------------- */
/* Create target file */
/* -------------------------------------------------------------------- */
CPLString osFilename;
if (bCompress)
{
osFilename = "/vsigzip/";
osFilename += pszFilename;
}
else
osFilename = pszFilename;
VSILFILE *fp = VSIFOpenL(osFilename.c_str(), "wb");
if (fp == nullptr)
{
CPLError(CE_Failure, CPLE_AppDefined, "Cannot create %s", pszFilename);
return nullptr;
}
/* -------------------------------------------------------------------- */
/* Write header */
/* -------------------------------------------------------------------- */
VSIFWriteL("HF2\0", 4, 1, fp);
WriteShort(fp, 0);
WriteInt(fp, nXSize);
WriteInt(fp, nYSize);
WriteShort(fp, (GInt16)nTileSize);
WriteFloat(fp, fVertPres);
const float fHorizScale =
(float)((fabs(adfGeoTransform[1]) + fabs(adfGeoTransform[5])) / 2);
WriteFloat(fp, fHorizScale);
WriteInt(fp, nExtendedHeaderLen);
/* -------------------------------------------------------------------- */
/* Write extended header */
/* -------------------------------------------------------------------- */
char szBlockName[16 + 1];
if (bHasGeoTransform)
{
VSIFWriteL("bin\0", 4, 1, fp);
memset(szBlockName, 0, 16 + 1);
strcpy(szBlockName, "georef-extents");
VSIFWriteL(szBlockName, 16, 1, fp);
WriteInt(fp, 34);
WriteShort(fp, (GInt16)nExtentUnits);
WriteDouble(fp, adfGeoTransform[0]);
WriteDouble(fp, adfGeoTransform[0] + nXSize * adfGeoTransform[1]);
WriteDouble(fp, adfGeoTransform[3] + nYSize * adfGeoTransform[5]);
WriteDouble(fp, adfGeoTransform[3]);
}
if (nUTMZone != 0)
{
VSIFWriteL("bin\0", 4, 1, fp);
memset(szBlockName, 0, 16 + 1);
strcpy(szBlockName, "georef-utm");
VSIFWriteL(szBlockName, 16, 1, fp);
WriteInt(fp, 2);
WriteShort(fp, (GInt16)((bNorth) ? nUTMZone : -nUTMZone));
}
if (nDatumCode != -2)
{
VSIFWriteL("bin\0", 4, 1, fp);
memset(szBlockName, 0, 16 + 1);
strcpy(szBlockName, "georef-datum");
VSIFWriteL(szBlockName, 16, 1, fp);
WriteInt(fp, 2);
WriteShort(fp, (GInt16)nDatumCode);
}
if (nEPSGCode != 0)
{
VSIFWriteL("bin\0", 4, 1, fp);
memset(szBlockName, 0, 16 + 1);
strcpy(szBlockName, "georef-epsg-prj");
VSIFWriteL(szBlockName, 16, 1, fp);
WriteInt(fp, 2);
WriteShort(fp, (GInt16)nEPSGCode);
}
/* -------------------------------------------------------------------- */
/* Copy imagery */
/* -------------------------------------------------------------------- */
const int nXBlocks = (nXSize + nTileSize - 1) / nTileSize;
const int nYBlocks = (nYSize + nTileSize - 1) / nTileSize;
void *pTileBuffer = VSI_MALLOC3_VERBOSE(nTileSize, nTileSize,
GDALGetDataTypeSizeBytes(eReqDT));
if (pTileBuffer == nullptr)
{
VSIFCloseL(fp);
return nullptr;
}
CPLErr eErr = CE_None;
for (int j = 0; j < nYBlocks && eErr == CE_None; j++)
{
for (int i = 0; i < nXBlocks && eErr == CE_None; i++)
{
const int nReqXSize = std::min(nTileSize, nXSize - i * nTileSize);
const int nReqYSize = std::min(nTileSize, nYSize - j * nTileSize);
eErr = poSrcDS->GetRasterBand(1)->RasterIO(
GF_Read, i * nTileSize,
std::max(0, nYSize - (j + 1) * nTileSize), nReqXSize, nReqYSize,
pTileBuffer, nReqXSize, nReqYSize, eReqDT, 0, 0, nullptr);
if (eErr != CE_None)
break;
if (eReqDT == GDT_Int16)
{