/****************************************************************************** * $Id: landataset.cpp 33864 2016-04-02 11:50:14Z goatbar $ * * Project: eCognition * Purpose: Implementation of Erdas .LAN / .GIS format. * Author: Frank Warmerdam, warmerdam@pobox.com * ****************************************************************************** * Copyright (c) 2004, Frank Warmerdam * Copyright (c) 2008-2011, Even Rouault * * 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 "ogr_spatialref.h" #include "rawdataset.h" #include #include CPL_CVSID("$Id: landataset.cpp 33864 2016-04-02 11:50:14Z goatbar $"); /** Erdas Header format: "HEAD74" Offset Size Type Description ------ ---- ---- ----------- 0 6 char magic cookie / version (i.e. HEAD74). 6 2 Int16 Pixel type, 0=8bit, 1=4bit, 2=16bit 8 2 Int16 Number of Bands. 10 6 char Unknown. 16 4 Int32 Width 20 4 Int32 Height 24 4 Int32 X Start (offset in original file?) 28 4 Int32 Y Start (offset in original file?) 32 56 char Unknown. 88 2 Int16 0=LAT, 1=UTM, 2=StatePlane, 3- are projections? 90 2 Int16 Classes in coverage. 92 14 char Unknown. 106 2 Int16 Area Unit (0=none, 1=Acre, 2=Hectare, 3=Other) 108 4 Float32 Pixel area. 112 4 Float32 Upper Left corner X (center of pixel?) 116 4 Float32 Upper Left corner Y (center of pixel?) 120 4 Float32 Width of a pixel. 124 4 Float32 Height of a pixel. Erdas Header format: "HEADER" Offset Size Type Description ------ ---- ---- ----------- 0 6 char magic cookie / version (i.e. HEAD74). 6 2 Int16 Pixel type, 0=8bit, 1=4bit, 2=16bit 8 2 Int16 Number of Bands. 10 6 char Unknown. 16 4 Float32 Width 20 4 Float32 Height 24 4 Int32 X Start (offset in original file?) 28 4 Int32 Y Start (offset in original file?) 32 56 char Unknown. 88 2 Int16 0=LAT, 1=UTM, 2=StatePlane, 3- are projections? 90 2 Int16 Classes in coverage. 92 14 char Unknown. 106 2 Int16 Area Unit (0=none, 1=Acre, 2=Hectare, 3=Other) 108 4 Float32 Pixel area. 112 4 Float32 Upper Left corner X (center of pixel?) 116 4 Float32 Upper Left corner Y (center of pixel?) 120 4 Float32 Width of a pixel. 124 4 Float32 Height of a pixel. All binary fields are in the same byte order but it may be big endian or little endian depending on what platform the file was written on. Usually this can be checked against the number of bands though this test won't work if there are more than 255 bands. There is also some information on .STA and .TRL files at: http://www.pcigeomatics.com/cgi-bin/pcihlp/ERDASWR%7CTRAILER+FORMAT **/ static const int ERD_HEADER_SIZE = 128; /************************************************************************/ /* ==================================================================== */ /* LAN4BitRasterBand */ /* ==================================================================== */ /************************************************************************/ class LANDataset; class LAN4BitRasterBand : public GDALPamRasterBand { GDALColorTable *poCT; GDALColorInterp eInterp; public: LAN4BitRasterBand( LANDataset *, int ); virtual ~LAN4BitRasterBand(); virtual GDALColorTable *GetColorTable(); virtual GDALColorInterp GetColorInterpretation(); virtual CPLErr SetColorTable( GDALColorTable * ); virtual CPLErr SetColorInterpretation( GDALColorInterp ); virtual CPLErr IReadBlock( int, int, void * ); }; /************************************************************************/ /* ==================================================================== */ /* LANDataset */ /* ==================================================================== */ /************************************************************************/ class LANDataset : public RawDataset { public: VSILFILE *fpImage; // image data file. char pachHeader[ERD_HEADER_SIZE]; char *pszProjection; double adfGeoTransform[6]; CPLString osSTAFilename; void CheckForStatistics(void); virtual char **GetFileList(); public: LANDataset(); virtual ~LANDataset(); virtual CPLErr GetGeoTransform( double * padfTransform ); virtual CPLErr SetGeoTransform( double * padfTransform ); virtual const char *GetProjectionRef(); virtual CPLErr SetProjection( const char * ); static GDALDataset *Open( GDALOpenInfo * ); static GDALDataset *Create( const char * pszFilename, int nXSize, int nYSize, int nBands, GDALDataType eType, char ** papszOptions ); }; /************************************************************************/ /* ==================================================================== */ /* LAN4BitRasterBand */ /* ==================================================================== */ /************************************************************************/ /************************************************************************/ /* LAN4BitRasterBand() */ /************************************************************************/ LAN4BitRasterBand::LAN4BitRasterBand( LANDataset *poDSIn, int nBandIn ) : poCT(NULL), eInterp(GCI_Undefined) { poDS = poDSIn; nBand = nBandIn; eDataType = GDT_Byte; nBlockXSize = poDSIn->GetRasterXSize();; nBlockYSize = 1; } /************************************************************************/ /* ~LAN4BitRasterBand() */ /************************************************************************/ LAN4BitRasterBand::~LAN4BitRasterBand() { if( poCT ) delete poCT; } /************************************************************************/ /* IReadBlock() */ /************************************************************************/ CPLErr LAN4BitRasterBand::IReadBlock( CPL_UNUSED int nBlockXOff, int nBlockYOff, void * pImage ) { LANDataset *poLAN_DS = reinterpret_cast( poDS ); CPLAssert( nBlockXOff == 0 ); /* -------------------------------------------------------------------- */ /* Seek to profile. */ /* -------------------------------------------------------------------- */ const vsi_l_offset nOffset = ERD_HEADER_SIZE + (static_cast(nBlockYOff) * nRasterXSize * poLAN_DS->GetRasterCount()) / 2 + (static_cast(nBand - 1) * nRasterXSize) / 2; if( VSIFSeekL( poLAN_DS->fpImage, nOffset, SEEK_SET ) != 0 ) { CPLError( CE_Failure, CPLE_FileIO, "LAN Seek failed:%s", VSIStrerror( errno ) ); return CE_Failure; } /* -------------------------------------------------------------------- */ /* Read the profile. */ /* -------------------------------------------------------------------- */ if( VSIFReadL( pImage, 1, nRasterXSize/2, poLAN_DS->fpImage ) != (size_t) nRasterXSize / 2 ) { CPLError( CE_Failure, CPLE_FileIO, "LAN Read failed:%s", VSIStrerror( errno ) ); return CE_Failure; } /* -------------------------------------------------------------------- */ /* Convert 4bit to 8bit. */ /* -------------------------------------------------------------------- */ for( int i = nRasterXSize-1; i >= 0; i-- ) { if( (i & 0x01) != 0 ) reinterpret_cast( pImage )[i] = ((GByte *) pImage)[i/2] & 0x0f; else reinterpret_cast( pImage )[i] = (((GByte *) pImage)[i/2] & 0xf0)/16; } return CE_None; } /************************************************************************/ /* SetColorTable() */ /************************************************************************/ CPLErr LAN4BitRasterBand::SetColorTable( GDALColorTable *poNewCT ) { if( poCT ) delete poCT; if( poNewCT == NULL ) poCT = NULL; else poCT = poNewCT->Clone(); return CE_None; } /************************************************************************/ /* GetColorTable() */ /************************************************************************/ GDALColorTable *LAN4BitRasterBand::GetColorTable() { if( poCT != NULL ) return poCT; return GDALPamRasterBand::GetColorTable(); } /************************************************************************/ /* SetColorInterpretation() */ /************************************************************************/ CPLErr LAN4BitRasterBand::SetColorInterpretation( GDALColorInterp eNewInterp ) { eInterp = eNewInterp; return CE_None; } /************************************************************************/ /* GetColorInterpretation() */ /************************************************************************/ GDALColorInterp LAN4BitRasterBand::GetColorInterpretation() { return eInterp; } /************************************************************************/ /* ==================================================================== */ /* LANDataset */ /* ==================================================================== */ /************************************************************************/ /************************************************************************/ /* LANDataset() */ /************************************************************************/ LANDataset::LANDataset() : fpImage(NULL), pszProjection(NULL) { } /************************************************************************/ /* ~LANDataset() */ /************************************************************************/ LANDataset::~LANDataset() { FlushCache(); if( fpImage != NULL ) { if( VSIFCloseL( fpImage ) != 0 ) { CPLError(CE_Failure, CPLE_FileIO, "I/O error"); } } CPLFree( pszProjection ); } /************************************************************************/ /* Open() */ /************************************************************************/ GDALDataset *LANDataset::Open( GDALOpenInfo * poOpenInfo ) { /* -------------------------------------------------------------------- */ /* We assume the user is pointing to the header (.pcb) file. */ /* Does this appear to be a pcb file? */ /* -------------------------------------------------------------------- */ if( poOpenInfo->nHeaderBytes < ERD_HEADER_SIZE ) return NULL; if( !STARTS_WITH_CI((const char *)poOpenInfo->pabyHeader, "HEADER") && !STARTS_WITH_CI((const char *)poOpenInfo->pabyHeader, "HEAD74") ) return NULL; /* -------------------------------------------------------------------- */ /* Create a corresponding GDALDataset. */ /* -------------------------------------------------------------------- */ LANDataset *poDS = new LANDataset(); poDS->eAccess = poOpenInfo->eAccess; /* -------------------------------------------------------------------- */ /* Adopt the openinfo file pointer for use with this file. */ /* -------------------------------------------------------------------- */ if( poOpenInfo->eAccess == GA_ReadOnly ) poDS->fpImage = VSIFOpenL( poOpenInfo->pszFilename, "rb" ); else poDS->fpImage = VSIFOpenL( poOpenInfo->pszFilename, "rb+" ); if( poDS->fpImage == NULL ) { delete poDS; return NULL; } /* -------------------------------------------------------------------- */ /* Do we need to byte swap the headers to local machine order? */ /* -------------------------------------------------------------------- */ int bBigEndian = poOpenInfo->pabyHeader[8] == 0; memcpy( poDS->pachHeader, poOpenInfo->pabyHeader, ERD_HEADER_SIZE ); #ifdef CPL_LSB const int bNeedSwap = bBigEndian; #else const int bNeedSwap = !bBigEndian; #endif if( bNeedSwap ) { CPL_SWAP16PTR( poDS->pachHeader + 6 ); CPL_SWAP16PTR( poDS->pachHeader + 8 ); CPL_SWAP32PTR( poDS->pachHeader + 16 ); CPL_SWAP32PTR( poDS->pachHeader + 20 ); CPL_SWAP32PTR( poDS->pachHeader + 24 ); CPL_SWAP32PTR( poDS->pachHeader + 28 ); CPL_SWAP16PTR( poDS->pachHeader + 88 ); CPL_SWAP16PTR( poDS->pachHeader + 90 ); CPL_SWAP16PTR( poDS->pachHeader + 106 ); CPL_SWAP32PTR( poDS->pachHeader + 108 ); CPL_SWAP32PTR( poDS->pachHeader + 112 ); CPL_SWAP32PTR( poDS->pachHeader + 116 ); CPL_SWAP32PTR( poDS->pachHeader + 120 ); CPL_SWAP32PTR( poDS->pachHeader + 124 ); } /* -------------------------------------------------------------------- */ /* Capture some information from the file that is of interest. */ /* -------------------------------------------------------------------- */ if( STARTS_WITH_CI(poDS->pachHeader,"HEADER") ) { float fTmp; memcpy(&fTmp, poDS->pachHeader + 16, 4); CPL_LSBPTR32(&fTmp); poDS->nRasterXSize = (int) fTmp; memcpy(&fTmp, poDS->pachHeader + 20, 4); CPL_LSBPTR32(&fTmp); poDS->nRasterYSize = (int) fTmp; } else { GInt32 nTmp; memcpy(&nTmp, poDS->pachHeader + 16, 4); CPL_LSBPTR32(&nTmp); poDS->nRasterXSize = nTmp; memcpy(&nTmp, poDS->pachHeader + 20, 4); CPL_LSBPTR32(&nTmp); poDS->nRasterYSize = nTmp; } GInt16 nTmp16; memcpy(&nTmp16, poDS->pachHeader + 6, 2); CPL_LSBPTR16(&nTmp16); int nPixelOffset; GDALDataType eDataType; if( nTmp16 == 0 ) { eDataType = GDT_Byte; nPixelOffset = 1; } else if( nTmp16 == 1 ) /* 4bit! */ { eDataType = GDT_Byte; nPixelOffset = -1; } else if( nTmp16 == 2 ) { nPixelOffset = 2; eDataType = GDT_Int16; } else { CPLError( CE_Failure, CPLE_AppDefined, "Unsupported pixel type (%d).", nTmp16 ); delete poDS; return NULL; } memcpy(&nTmp16, poDS->pachHeader + 8, 2); CPL_LSBPTR16(&nTmp16); const int nBandCount = nTmp16; if (!GDALCheckDatasetDimensions(poDS->nRasterXSize, poDS->nRasterYSize) || !GDALCheckBandCount(nBandCount, FALSE)) { delete poDS; return NULL; } if( nPixelOffset != -1 && poDS->nRasterXSize > INT_MAX / (nPixelOffset*nBandCount) ) { CPLError( CE_Failure, CPLE_AppDefined, "Int overflow occurred."); delete poDS; return NULL; } /* -------------------------------------------------------------------- */ /* Create band information object. */ /* -------------------------------------------------------------------- */ CPLErrorReset(); for( int iBand = 1; iBand <= nBandCount; iBand++ ) { if( nPixelOffset == -1 ) /* 4 bit case */ poDS->SetBand( iBand, new LAN4BitRasterBand( poDS, iBand ) ); else poDS->SetBand( iBand, new RawRasterBand( poDS, iBand, poDS->fpImage, ERD_HEADER_SIZE + (iBand-1) * nPixelOffset * poDS->nRasterXSize, nPixelOffset, poDS->nRasterXSize*nPixelOffset*nBandCount, eDataType, !bNeedSwap, TRUE )); if( CPLGetLastErrorType() != CE_None ) { delete poDS; return NULL; } } /* -------------------------------------------------------------------- */ /* Initialize any PAM information. */ /* -------------------------------------------------------------------- */ poDS->SetDescription( poOpenInfo->pszFilename ); poDS->CheckForStatistics(); poDS->TryLoadXML(); /* -------------------------------------------------------------------- */ /* Check for overviews. */ /* -------------------------------------------------------------------- */ poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename ); /* -------------------------------------------------------------------- */ /* Try to interpret georeferencing. */ /* -------------------------------------------------------------------- */ float fTmp; memcpy(&fTmp, poDS->pachHeader + 112, 4); CPL_LSBPTR32(&fTmp); poDS->adfGeoTransform[0] = fTmp; memcpy(&fTmp, poDS->pachHeader + 120, 4); CPL_LSBPTR32(&fTmp); poDS->adfGeoTransform[1] = fTmp; poDS->adfGeoTransform[2] = 0.0; memcpy(&fTmp, poDS->pachHeader + 116, 4); CPL_LSBPTR32(&fTmp); poDS->adfGeoTransform[3] = fTmp; poDS->adfGeoTransform[4] = 0.0; memcpy(&fTmp, poDS->pachHeader + 124, 4); CPL_LSBPTR32(&fTmp); poDS->adfGeoTransform[5] = - fTmp; // adjust for center of pixel vs. top left corner of pixel. poDS->adfGeoTransform[0] -= poDS->adfGeoTransform[1] * 0.5; poDS->adfGeoTransform[3] -= poDS->adfGeoTransform[5] * 0.5; /* -------------------------------------------------------------------- */ /* If we didn't get any georeferencing, try for a worldfile. */ /* -------------------------------------------------------------------- */ if( poDS->adfGeoTransform[1] == 0.0 || poDS->adfGeoTransform[5] == 0.0 ) { if( !GDALReadWorldFile( poOpenInfo->pszFilename, NULL, poDS->adfGeoTransform ) ) GDALReadWorldFile( poOpenInfo->pszFilename, ".wld", poDS->adfGeoTransform ); } /* -------------------------------------------------------------------- */ /* Try to come up with something for the coordinate system. */ /* -------------------------------------------------------------------- */ memcpy(&nTmp16, poDS->pachHeader + 88, 2); CPL_LSBPTR16(&nTmp16); int nCoordSys = nTmp16; if( nCoordSys == 0 ) { poDS->pszProjection = CPLStrdup(SRS_WKT_WGS84); } else if( nCoordSys == 1 ) { poDS->pszProjection = CPLStrdup("LOCAL_CS[\"UTM - Zone Unknown\",UNIT[\"Meter\",1]]"); } else if( nCoordSys == 2 ) { poDS->pszProjection = CPLStrdup("LOCAL_CS[\"State Plane - Zone Unknown\",UNIT[\"US survey foot\",0.3048006096012192]]"); } else { poDS->pszProjection = CPLStrdup("LOCAL_CS[\"Unknown\",UNIT[\"Meter\",1]]"); } /* -------------------------------------------------------------------- */ /* Check for a trailer file with a colormap in it. */ /* -------------------------------------------------------------------- */ char *pszPath = CPLStrdup(CPLGetPath(poOpenInfo->pszFilename)); char *pszBasename = CPLStrdup(CPLGetBasename(poOpenInfo->pszFilename)); const char *pszTRLFilename = CPLFormCIFilename( pszPath, pszBasename, "trl" ); VSILFILE *fpTRL = VSIFOpenL( pszTRLFilename, "rb" ); if( fpTRL != NULL ) { char szTRLData[896]; CPL_IGNORE_RET_VAL(VSIFReadL( szTRLData, 1, 896, fpTRL )); CPL_IGNORE_RET_VAL(VSIFCloseL( fpTRL )); GDALColorTable *poCT = new GDALColorTable(); for( int iColor = 0; iColor < 256; iColor++ ) { GDALColorEntry sEntry; sEntry.c2 = ((GByte *) szTRLData)[iColor+128]; sEntry.c1 = ((GByte *) szTRLData)[iColor+128+256]; sEntry.c3 = ((GByte *) szTRLData)[iColor+128+512]; sEntry.c4 = 255; poCT->SetColorEntry( iColor, &sEntry ); // only 16 colors in 4bit files. if( nPixelOffset == -1 && iColor == 15 ) break; } poDS->GetRasterBand(1)->SetColorTable( poCT ); poDS->GetRasterBand(1)->SetColorInterpretation( GCI_PaletteIndex ); delete poCT; } CPLFree( pszPath ); CPLFree( pszBasename ); return( poDS ); } /************************************************************************/ /* GetGeoTransform() */ /************************************************************************/ CPLErr LANDataset::GetGeoTransform( double * padfTransform ) { if( adfGeoTransform[1] != 0.0 && adfGeoTransform[5] != 0.0 ) { memcpy( padfTransform, adfGeoTransform, sizeof(double)*6 ); return CE_None; } else return GDALPamDataset::GetGeoTransform( padfTransform ); } /************************************************************************/ /* SetGeoTransform() */ /************************************************************************/ CPLErr LANDataset::SetGeoTransform( double * padfTransform ) { unsigned char abyHeader[128]; memcpy( adfGeoTransform, padfTransform, sizeof(double) * 6 ); CPL_IGNORE_RET_VAL(VSIFSeekL( fpImage, 0, SEEK_SET )); CPL_IGNORE_RET_VAL(VSIFReadL( abyHeader, 128, 1, fpImage )); // Upper Left X float f32Val = static_cast( adfGeoTransform[0] + 0.5 * adfGeoTransform[1] ); memcpy( abyHeader + 112, &f32Val, 4 ); // Upper Left Y f32Val = static_cast( adfGeoTransform[3] + 0.5 * adfGeoTransform[5] ); memcpy( abyHeader + 116, &f32Val, 4 ); // width of pixel f32Val = static_cast( adfGeoTransform[1] ); memcpy( abyHeader + 120, &f32Val, 4 ); // height of pixel f32Val = static_cast( std::abs( adfGeoTransform[5] ) ); memcpy( abyHeader + 124, &f32Val, 4 ); if( VSIFSeekL( fpImage, 0, SEEK_SET ) != 0 || VSIFWriteL( abyHeader, 128, 1, fpImage ) != 1 ) { CPLError( CE_Failure, CPLE_FileIO, "File IO Error writing header with new geotransform." ); return CE_Failure; } return CE_None; } /************************************************************************/ /* GetProjectionRef() */ /* */ /* Use PAM coordinate system if available in preference to the */ /* generally poor value derived from the file itself. */ /************************************************************************/ const char *LANDataset::GetProjectionRef() { const char* pszPamPrj = GDALPamDataset::GetProjectionRef(); if( pszProjection != NULL && strlen(pszPamPrj) == 0 ) return pszProjection; return pszPamPrj; } /************************************************************************/ /* SetProjection() */ /************************************************************************/ CPLErr LANDataset::SetProjection( const char * pszWKT ) { unsigned char abyHeader[128]; CPL_IGNORE_RET_VAL(VSIFSeekL( fpImage, 0, SEEK_SET )); CPL_IGNORE_RET_VAL(VSIFReadL( abyHeader, 128, 1, fpImage )); OGRSpatialReference oSRS( pszWKT ); GUInt16 nProjCode = 0; if( oSRS.IsGeographic() ) nProjCode = 0; else if( oSRS.GetUTMZone() != 0 ) nProjCode = 1; // Too bad we have no way of recognising state plane projections. else { const char *l_pszProjection = oSRS.GetAttrValue("PROJECTION"); if( l_pszProjection == NULL ) ; else if( EQUAL(l_pszProjection, SRS_PT_ALBERS_CONIC_EQUAL_AREA) ) nProjCode = 3; else if( EQUAL(l_pszProjection, SRS_PT_LAMBERT_CONFORMAL_CONIC_1SP) ) nProjCode = 4; else if( EQUAL(l_pszProjection, SRS_PT_MERCATOR_1SP) ) nProjCode = 5; else if( EQUAL(l_pszProjection, SRS_PT_POLAR_STEREOGRAPHIC) ) nProjCode = 6; else if( EQUAL(l_pszProjection, SRS_PT_POLYCONIC) ) nProjCode = 7; else if( EQUAL(l_pszProjection, SRS_PT_EQUIDISTANT_CONIC) ) nProjCode = 8; else if( EQUAL(l_pszProjection, SRS_PT_TRANSVERSE_MERCATOR) ) nProjCode = 9; else if( EQUAL(l_pszProjection, SRS_PT_STEREOGRAPHIC) ) nProjCode = 10; else if( EQUAL(l_pszProjection, SRS_PT_LAMBERT_AZIMUTHAL_EQUAL_AREA) ) nProjCode = 11; else if( EQUAL(l_pszProjection, SRS_PT_AZIMUTHAL_EQUIDISTANT) ) nProjCode = 12; else if( EQUAL(l_pszProjection, SRS_PT_GNOMONIC) ) nProjCode = 13; else if( EQUAL(l_pszProjection, SRS_PT_ORTHOGRAPHIC) ) nProjCode = 14; // we don't have GVNP. else if( EQUAL(l_pszProjection, SRS_PT_SINUSOIDAL) ) nProjCode = 16; else if( EQUAL(l_pszProjection, SRS_PT_EQUIRECTANGULAR) ) nProjCode = 17; else if( EQUAL(l_pszProjection, SRS_PT_MILLER_CYLINDRICAL) ) nProjCode = 18; else if( EQUAL(l_pszProjection, SRS_PT_VANDERGRINTEN) ) nProjCode = 19; else if( EQUAL(l_pszProjection, SRS_PT_HOTINE_OBLIQUE_MERCATOR) ) nProjCode = 20; } memcpy( abyHeader + 88, &nProjCode, 2 ); CPL_IGNORE_RET_VAL(VSIFSeekL( fpImage, 0, SEEK_SET )); CPL_IGNORE_RET_VAL(VSIFWriteL( abyHeader, 128, 1, fpImage )); return GDALPamDataset::SetProjection( pszWKT ); } /************************************************************************/ /* GetFileList() */ /************************************************************************/ char **LANDataset::GetFileList() { // Main data file, etc. char **papszFileList = GDALPamDataset::GetFileList(); if( strlen(osSTAFilename) > 0 ) papszFileList = CSLAddString( papszFileList, osSTAFilename ); return papszFileList; } /************************************************************************/ /* CheckForStatistics() */ /************************************************************************/ void LANDataset::CheckForStatistics() { /* -------------------------------------------------------------------- */ /* Do we have a statistics file? */ /* -------------------------------------------------------------------- */ osSTAFilename = CPLResetExtension(GetDescription(),"sta"); VSILFILE *fpSTA = VSIFOpenL( osSTAFilename, "r" ); if( fpSTA == NULL && VSIIsCaseSensitiveFS(osSTAFilename) ) { osSTAFilename = CPLResetExtension(GetDescription(),"STA"); fpSTA = VSIFOpenL( osSTAFilename, "r" ); } if( fpSTA == NULL ) { osSTAFilename = ""; return; } /* -------------------------------------------------------------------- */ /* Read it one band at a time. */ /* -------------------------------------------------------------------- */ GByte abyBandInfo[1152]; for( int iBand = 0; iBand < nBands; iBand++ ) { if( VSIFReadL( abyBandInfo, 1152, 1, fpSTA ) != 1 ) break; const int nBandNumber = abyBandInfo[7]; GDALRasterBand *poBand = GetRasterBand(nBandNumber); if( poBand == NULL ) break; GInt16 nMin, nMax; if( poBand->GetRasterDataType() != GDT_Byte ) { memcpy( &nMin, abyBandInfo + 28, 2 ); memcpy( &nMax, abyBandInfo + 30, 2 ); CPL_LSBPTR16( &nMin ); CPL_LSBPTR16( &nMax ); } else { nMin = abyBandInfo[9]; nMax = abyBandInfo[8]; } float fMean, fStdDev; memcpy( &fMean, abyBandInfo + 12, 4 ); memcpy( &fStdDev, abyBandInfo + 24, 4 ); CPL_LSBPTR32( &fMean ); CPL_LSBPTR32( &fStdDev ); poBand->SetStatistics( nMin, nMax, fMean, fStdDev ); } CPL_IGNORE_RET_VAL(VSIFCloseL( fpSTA )); } /************************************************************************/ /* Create() */ /************************************************************************/ GDALDataset *LANDataset::Create( const char * pszFilename, int nXSize, int nYSize, int nBands, GDALDataType eType, CPL_UNUSED char ** papszOptions ) { if( eType != GDT_Byte && eType != GDT_Int16 ) { CPLError( CE_Failure, CPLE_AppDefined, "Attempt to create .GIS file with unsupported data type '%s'.", GDALGetDataTypeName( eType ) ); return NULL; } /* -------------------------------------------------------------------- */ /* Try to create the file. */ /* -------------------------------------------------------------------- */ VSILFILE *fp = VSIFOpenL( pszFilename, "wb" ); if( fp == NULL ) { CPLError( CE_Failure, CPLE_OpenFailed, "Attempt to create file `%s' failed.\n", pszFilename ); return NULL; } /* -------------------------------------------------------------------- */ /* Write out the header. */ /* -------------------------------------------------------------------- */ unsigned char abyHeader[128]; memset( abyHeader, 0, sizeof(abyHeader) ); memcpy( abyHeader + 0, "HEAD74", 6 ); // Pixel type GInt16 n16Val; if( eType == GDT_Byte ) // do we want 4bit? n16Val = 0; else n16Val = 2; memcpy( abyHeader + 6, &n16Val, 2 ); // Number of Bands. n16Val = (GInt16) nBands; memcpy( abyHeader + 8, &n16Val, 2 ); // Unknown (6) // Width GInt32 n32Val = nXSize; memcpy( abyHeader + 16, &n32Val, 4 ); // Height n32Val = nYSize; memcpy( abyHeader + 20, &n32Val, 4 ); // X Start (4) // Y Start (4) // Unknown (56) // Coordinate System n16Val = 0; memcpy( abyHeader + 88, &n16Val, 2 ); // Classes in coverage n16Val = 0; memcpy( abyHeader + 90, &n16Val, 2 ); // Unknown (14) // Area Unit n16Val = 0; memcpy( abyHeader + 106, &n16Val, 2 ); // Pixel Area float f32Val = 0.0f; memcpy( abyHeader + 108, &f32Val, 4 ); // Upper Left X f32Val = 0.5f; memcpy( abyHeader + 112, &f32Val, 4 ); // Upper Left Y f32Val = (float) (nYSize - 0.5); memcpy( abyHeader + 116, &f32Val, 4 ); // width of pixel f32Val = 1.0f; memcpy( abyHeader + 120, &f32Val, 4 ); // height of pixel f32Val = 1.0f; memcpy( abyHeader + 124, &f32Val, 4 ); CPL_IGNORE_RET_VAL(VSIFWriteL( abyHeader, sizeof(abyHeader), 1, fp )); /* -------------------------------------------------------------------- */ /* Extend the file to the target size. */ /* -------------------------------------------------------------------- */ vsi_l_offset nImageBytes; if( eType != GDT_Byte ) nImageBytes = nXSize * static_cast( nYSize ) * 2; else nImageBytes = nXSize * static_cast( nYSize ); memset( abyHeader, 0, sizeof(abyHeader) ); while( nImageBytes > 0 ) { const vsi_l_offset nWriteThisTime = std::min( static_cast( nImageBytes ), sizeof(abyHeader) ); if( VSIFWriteL( abyHeader, 1, (size_t)nWriteThisTime, fp ) != nWriteThisTime ) { CPL_IGNORE_RET_VAL(VSIFCloseL( fp )); CPLError( CE_Failure, CPLE_FileIO, "Failed to write whole Istar file." ); return NULL; } nImageBytes -= nWriteThisTime; } if( VSIFCloseL( fp ) != 0 ) { CPLError( CE_Failure, CPLE_FileIO, "Failed to write whole Istar file." ); return NULL; } return (GDALDataset *) GDALOpen( pszFilename, GA_Update ); } /************************************************************************/ /* GDALRegister_LAN() */ /************************************************************************/ void GDALRegister_LAN() { if( GDALGetDriverByName( "LAN" ) != NULL ) return; GDALDriver *poDriver = new GDALDriver(); poDriver->SetDescription( "LAN" ); poDriver->SetMetadataItem( GDAL_DCAP_RASTER, "YES" ); poDriver->SetMetadataItem( GDAL_DMD_LONGNAME, "Erdas .LAN/.GIS" ); poDriver->SetMetadataItem( GDAL_DMD_HELPTOPIC, "frmt_various.html#LAN" ); poDriver->SetMetadataItem( GDAL_DCAP_VIRTUALIO, "YES" ); poDriver->SetMetadataItem( GDAL_DMD_CREATIONDATATYPES, "Byte Int16" ); poDriver->pfnOpen = LANDataset::Open; poDriver->pfnCreate = LANDataset::Create; GetGDALDriverManager()->RegisterDriver( poDriver ); }