CPLErr IRISRasterBand::IReadBlock( int nBlockXOff, int nBlockYOff,
void * pImage )
{
IRISDataset *poGDS = (IRISDataset *) poDS;
//Every product type has it's own size. TODO: Move it like dataType
int nDataLength = 1;
if(poGDS->nDataTypeCode == 2){nDataLength=1;}
else if(poGDS->nDataTypeCode == 37){nDataLength=2;}
else if(poGDS->nDataTypeCode == 33){nDataLength=2;}
else if(poGDS->nDataTypeCode == 32){nDataLength=1;}
int i;
//We allocate space for storing a record:
if (pszRecord == NULL)
{
if (bBufferAllocFailed)
return CE_Failure;
pszRecord = (unsigned char *) VSIMalloc(nBlockXSize*nDataLength);
if (pszRecord == NULL)
{
CPLError(CE_Failure, CPLE_OutOfMemory,
"Cannot allocate scanline buffer");
bBufferAllocFailed = TRUE;
return CE_Failure;
}
}
//Prepare to read (640 is the header size in bytes) and read (the y axis in the IRIS files in the inverse direction)
//The previous bands are also added as an offset
VSIFSeekL( poGDS->fp, 640 + (vsi_l_offset)nDataLength*poGDS->GetRasterXSize()*poGDS->GetRasterYSize()*(this->nBand-1) +
(vsi_l_offset)nBlockXSize*nDataLength*(poGDS->GetRasterYSize()-1-nBlockYOff), SEEK_SET );
if( (int)VSIFReadL( pszRecord, nBlockXSize*nDataLength, 1, poGDS->fp ) != 1 )
return CE_Failure;
//If datatype is dbZ or dBT:
//See point 3.3.3 at page 3.33 of the manual
if(poGDS->nDataTypeCode == 2 || poGDS->nDataTypeCode == 1){
float fVal;
for (i=0;i<nBlockXSize;i++){
fVal = (((float) *(pszRecord+i*nDataLength)) -64)/2.0;
if (fVal == 95.5)
fVal = -9999;
((float *) pImage)[i] = fVal;
}
//If datatype is dbZ2 or dBT2:
//See point 3.3.4 at page 3.33 of the manual
} else if(poGDS->nDataTypeCode == 8 || poGDS->nDataTypeCode == 9){
float fVal;
for (i=0;i<nBlockXSize;i++){
fVal = (((float) CPL_LSBUINT16PTR(pszRecord+i*nDataLength)) - 32768)/100.0;
if (fVal == 327.67)
fVal = -9999;
((float *) pImage)[i] = fVal;
}
//Fliquid2 (Rain1 & Rainn products)
//See point 3.3.11 at page 3.43 of the manual
} else if(poGDS->nDataTypeCode == 37){
unsigned short nVal, nExp, nMantissa;
float fVal2=0;
for (i=0;i<nBlockXSize;i++){
nVal = CPL_LSBUINT16PTR(pszRecord+i*nDataLength);
nExp = nVal>>12;
nMantissa = nVal - (nExp<<12);
if (nVal == 65535)
fVal2 = -9999;
else if (nExp == 0)
fVal2 = (float) nMantissa / 1000.0;
else
fVal2 = (float)((nMantissa+4096)<<(nExp-1))/1000.0;
((float *) pImage)[i] = fVal2;
}
//VIL2 (VIL products)
//See point 3.3.41 at page 3.54 of the manual
} else if(poGDS->nDataTypeCode == 33){
CPLErr IRISRasterBand::IReadBlock( int /* nBlockXOff */,
int nBlockYOff,
void * pImage )
{
IRISDataset *poGDS = static_cast<IRISDataset *>(poDS);
// Every product type has its own size. TODO: Move it like dataType.
int nDataLength = 1;
if( poGDS->nDataTypeCode == 2 ) nDataLength = 1;
else if( poGDS->nDataTypeCode == 8 ) nDataLength = 2;
else if( poGDS->nDataTypeCode == 9 ) nDataLength = 2;
else if( poGDS->nDataTypeCode == 37 ) nDataLength = 2;
else if( poGDS->nDataTypeCode == 33 ) nDataLength = 2;
else if( poGDS->nDataTypeCode == 32 ) nDataLength = 1;
// We allocate space for storing a record:
if( pszRecord == nullptr )
{
if( bBufferAllocFailed )
return CE_Failure;
pszRecord = static_cast<unsigned char *>(
VSI_MALLOC_VERBOSE(nBlockXSize*nDataLength));
if( pszRecord == nullptr )
{
bBufferAllocFailed = true;
return CE_Failure;
}
}
// Prepare to read (640 is the header size in bytes) and read (the
// y axis in the IRIS files in the inverse direction). The
// previous bands are also added as an offset
VSIFSeekL( poGDS->fp,
640 +
static_cast<vsi_l_offset>(nDataLength)*poGDS->GetRasterXSize()*poGDS->GetRasterYSize()*(this->nBand-1) +
static_cast<vsi_l_offset>(nBlockXSize)*nDataLength*(poGDS->GetRasterYSize()-1-nBlockYOff), SEEK_SET );
if( static_cast<int>(VSIFReadL( pszRecord, nBlockXSize*nDataLength, 1,
poGDS->fp )) != 1 )
return CE_Failure;
// If datatype is dbZ or dBT:
// See point 3.3.3 at page 3.33 of the manual.
if( poGDS->nDataTypeCode == 2 || poGDS->nDataTypeCode == 1 )
{
for( int i = 0; i < nBlockXSize; i++)
{
float fVal = ((*(pszRecord + i * nDataLength)) - 64.0f) / 2.0f;
if( fVal == 95.5f )
fVal = -9999.0f;
((float *) pImage)[i] = fVal;
}
// If datatype is dbZ2 or dBT2:
// See point 3.3.4 at page 3.33 of the manual.
}
else if( poGDS->nDataTypeCode == 8 || poGDS->nDataTypeCode == 9 )
{
for( int i = 0; i < nBlockXSize; i++)
{
float fVal =
(CPL_LSBUINT16PTR(pszRecord + i * nDataLength) - 32768.0f) /
100.0f;
if( fVal == 327.67f )
fVal = -9999.0f;
((float *) pImage)[i] = fVal;
}
// Fliquid2 (Rain1 & Rainn products)
// See point 3.3.11 at page 3.43 of the manual.
}
else if( poGDS->nDataTypeCode == 37 )
{
for( int i = 0; i < nBlockXSize; i++)
{
const unsigned short nVal =
CPL_LSBUINT16PTR(pszRecord+i*nDataLength);
const unsigned short nExp = nVal>>12;
const unsigned short nMantissa = nVal - (nExp<<12);
float fVal2 = 0.0f;
if( nVal == 65535 )
fVal2 = -9999.0f;
else if( nExp == 0 )
fVal2 = nMantissa / 1000.0f;
else
fVal2 = ((nMantissa + 4096) << (nExp - 1)) / 1000.0f;
((float *) pImage)[i] = fVal2;
}
// VIL2 (VIL products)
// See point 3.3.41 at page 3.54 of the manual.
}
else if( poGDS->nDataTypeCode == 33 )