private GridFileHeader ReadHeader(BinaryReader reader)
{
int k;
var header = new GridFileHeader();
byte[] buffer = new byte[NAME_LEN];
// --- NUM_OREC
reader.Read(buffer, 0, NAME_LEN); // string
reader.Read(buffer, 0, 4);
k = BitConverter.ToInt32(buffer, 0);
// Determine if byte-swapping is needed.
if (k != EXPECTED_OREC)
{
Array.Reverse(buffer, 0, 4);
k = BitConverter.ToInt32(buffer, 0);
if (k != EXPECTED_OREC)
{
throw new FormatException("Invalid grid header (expected NUM_OREC = 11).");
}
reverse = true;
}
header.NUM_OREC = k;
// Determine if pad-bytes are present.
reader.Read(buffer, 0, 4);
k = BitConverter.ToInt32(buffer, 0);
if (k == 0)
{
padding = true;
}
else
{
reader.BaseStream.Seek(-4, SeekOrigin.Current);
}
// --- NUM_SREC
reader.Read(buffer, 0, NAME_LEN); // string
header.NUM_SREC = reader.ReadInt32(buffer, reverse);
if (header.NUM_SREC != EXPECTED_SREC)
{
throw new FormatException("Invalid grid header (expected NUM_SREC = 11).");
}
if (padding)
{
reader.Read(buffer, 0, 4);
}
// --- NUM_FILE
reader.Read(buffer, 0, NAME_LEN); // string
header.NUM_FILE = reader.ReadInt32(buffer, reverse);
if (padding)
{
reader.Read(buffer, 0, 4);
}
// --- GS_TYPE
reader.Read(buffer, 0, NAME_LEN); // string
header.GS_TYPE = reader.ReadString(buffer, NAME_LEN);
// --- VERSION
reader.Read(buffer, 0, NAME_LEN); // string
header.VERSION = reader.ReadString(buffer, NAME_LEN);
// --- SYSTEM_F
reader.Read(buffer, 0, NAME_LEN); // string
header.SYSTEM_F = reader.ReadString(buffer, NAME_LEN);
// --- SYSTEM_T
reader.Read(buffer, 0, NAME_LEN); // string
header.SYSTEM_T = reader.ReadString(buffer, NAME_LEN);
// --- MAJOR_F
reader.Read(buffer, 0, NAME_LEN); // string
header.MAJOR_F = reader.ReadDouble(buffer, reverse);
// --- MINOR_F
reader.Read(buffer, 0, NAME_LEN); // string
header.MINOR_F = reader.ReadDouble(buffer, reverse);
// --- MAJOR_T
reader.Read(buffer, 0, NAME_LEN); // string
header.MAJOR_T = reader.ReadDouble(buffer, reverse);
// --- MINOR_T
reader.Read(buffer, 0, NAME_LEN); // string
header.MINOR_T = reader.ReadDouble(buffer, reverse);
return(header);
}
private GridFileHeader ReadHeader(StreamReader reader)
{
var header = new GridFileHeader();
int i = 0;
string line;
while (i < EXPECTED_OREC && (line = reader.ReadLine()) != null)
{
if (string.IsNullOrEmpty(line))
{
continue;
}
string key = line.Substring(0, 8).Trim().ToUpperInvariant();
string value = line.Substring(8).Trim();
var format = CultureInfo.InvariantCulture.NumberFormat;
switch (key)
{
case "NUM_OREC":
header.NUM_OREC = int.Parse(value);
if (header.NUM_OREC != EXPECTED_OREC)
{
throw new FormatException("Invalid grid header (expected NUM_OREC = 11).");
}
break;
case "NUM_SREC":
header.NUM_SREC = int.Parse(value);
if (header.NUM_SREC != EXPECTED_SREC)
{
throw new FormatException("Invalid grid header (expected NUM_SREC = 11).");
}
break;
case "NUM_FILE":
header.NUM_FILE = int.Parse(value);
break;
case "GS_TYPE":
header.GS_TYPE = value;
break;
case "VERSION":
header.VERSION = value;
break;
case "SYSTEM_F":
header.SYSTEM_F = value;
break;
case "SYSTEM_T":
header.SYSTEM_T = value;
break;
case "MAJOR_F":
header.MAJOR_F = double.Parse(value, format);
break;
case "MINOR_F":
header.MINOR_F = double.Parse(value, format);
break;
case "MAJOR_T":
header.MAJOR_T = double.Parse(value, format);
break;
case "MINOR_T":
header.MINOR_T = double.Parse(value, format);
break;
default:
break;
}
i++;
}
if (i != EXPECTED_OREC)
{
throw new FormatException("Invalid grid header.");
}
return(header);
}
