static double USGSDEMReadDoubleFromBuffer( Buffer* psBuffer, int nCharCount, int *pbSuccess = nullptr)
{
if (psBuffer->cur_index + nCharCount > psBuffer->buffer_size)
{
USGSDEMRefillBuffer(psBuffer);
if (psBuffer->cur_index + nCharCount > psBuffer->buffer_size)
{
if( pbSuccess ) *pbSuccess = FALSE;
return 0;
}
}
char* szPtr = psBuffer->buffer + psBuffer->cur_index;
char backupC = szPtr[nCharCount];
szPtr[nCharCount] = 0;
for( int i = 0; i < nCharCount; i++ )
{
if( szPtr[i] == 'D' )
szPtr[i] = 'E';
}
double dfVal = CPLAtof(szPtr);
szPtr[nCharCount] = backupC;
psBuffer->cur_index += nCharCount;
if( pbSuccess ) *pbSuccess = TRUE;
return dfVal;
}
static int USGSDEMReadIntFromBuffer( Buffer* psBuffer, int* pbSuccess = nullptr )
{
char c;
while (true)
{
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
USGSDEMRefillBuffer(psBuffer);
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
if( pbSuccess ) *pbSuccess = FALSE;
return 0;
}
}
c = psBuffer->buffer[psBuffer->cur_index];
psBuffer->cur_index ++;
if ( !isspace( static_cast<int>(c) ) )
break;
}
GIntBig nVal = 0;
int nSign = 1;
if (c == '-')
nSign = -1;
else if (c == '+')
nSign = 1;
else if (c >= '0' && c <= '9')
nVal = c - '0';
else
{
if( pbSuccess ) *pbSuccess = FALSE;
return 0;
}
while (true)
{
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
USGSDEMRefillBuffer(psBuffer);
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
if( pbSuccess ) *pbSuccess = TRUE;
return static_cast<int>(nSign * nVal);
}
}
c = psBuffer->buffer[psBuffer->cur_index];
if (c >= '0' && c <= '9')
{
psBuffer->cur_index ++;
if( nVal * nSign < INT_MAX && nVal * nSign > INT_MIN )
{
nVal = nVal * 10 + (c - '0');
if( nVal * nSign > INT_MAX )
{
nVal = INT_MAX;
nSign = 1;
}
else if( nVal * nSign < INT_MIN )
{
nVal = INT_MIN;
nSign = 1;
}
}
}
else
{
if( pbSuccess ) *pbSuccess = TRUE;
return static_cast<int>(nSign * nVal);
}
}
}
static int USGSDEMReadIntFromBuffer( Buffer* psBuffer, int* pbSuccess = NULL )
{
int nVal = 0;
char c;
while (TRUE)
{
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
USGSDEMRefillBuffer(psBuffer);
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
if( pbSuccess ) *pbSuccess = FALSE;
return 0;
}
}
c = psBuffer->buffer[psBuffer->cur_index];
psBuffer->cur_index ++;
if (!isspace((int)c))
break;
}
int nSign = 1;
if (c == '-')
nSign = -1;
else if (c == '+')
nSign = 1;
else if (c >= '0' && c <= '9')
nVal = c - '0';
else
{
if( pbSuccess ) *pbSuccess = FALSE;
return 0;
}
while (TRUE)
{
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
USGSDEMRefillBuffer(psBuffer);
if (psBuffer->cur_index >= psBuffer->buffer_size)
{
if( pbSuccess ) *pbSuccess = TRUE;
return nSign * nVal;
}
}
c = psBuffer->buffer[psBuffer->cur_index];
if (c >= '0' && c <= '9')
{
psBuffer->cur_index ++;
nVal = nVal * 10 + (c - '0');
}
else
{
if( pbSuccess ) *pbSuccess = TRUE;
return nSign * nVal;
}
}
}
