/// <summary>
/// Writes MAT-file header into <c>Stream</c>
/// </summary>
/// <param name="stream">The output stream</param>
private void WriteHeader(BinaryWriter stream)
{
// write descriptive text
MatFileHeader header = MatFileHeader.CreateHeader();
char[] dest = new char[116];
char[] src = header.Description.ToCharArray();
Array.Copy(src, 0, dest, 0, src.Length);
byte[] endianIndicator = header.EndianIndicator;
// ByteBuffer buf = new ByteBuffer( dest.Length * 2 + /* char size */ + 2 + endianIndicator.Length );
ByteBuffer buf = new ByteBuffer(128); // The header is always a 128-byte header
for (int i = 0; i < dest.Length; i++)
{
buf.Put((byte)dest[i]);
}
// write subsyst data offset
buf.Position(buf.Position() + 8);
// write version
int version = header.Version;
buf.PutShort((short)version);
buf.Put(endianIndicator);
stream.Write(buf.Array());
}
/// <summary>
/// Read Mat-file header.
/// </summary>
/// <param name="buf"><c>BinaryReader</c> input stream</param>
private void ReadHeader(Stream buf)
{
string description;
int version;
BinaryReader br = new BinaryReader(buf);
byte[] endianIndicator = new byte[2];
// descriptive text 116 bytes
byte[] descriptionBuffer = new byte[116];
br.Read(descriptionBuffer, 0, descriptionBuffer.Length);
description = ZeroEndByteArrayToString(descriptionBuffer);
if (!description.StartsWith("MATLAB 5.0 MAT-file"))
{
throw new MatlabIOException("This is not a valid MATLAB 5.0 MAT-file.");
}
// subsyst data offset 8 bytes
br.ReadBytes(8);
byte[] bversion = new byte[2];
// version 2 bytes
br.Read(bversion, 0, bversion.Length);
//endian indicator 2 bytes
br.Read(endianIndicator, 0, endianIndicator.Length);
// Program reading the MAT-file must perform byte swapping to interpret the data
// in the MAT-file correctly
if ((char)endianIndicator[0] == 'I' && (char)endianIndicator[1] == 'M')
{
// We have a Little Endian MAT-file
version = bversion[1] & 0xff | bversion[0] << 8;
}
else
{
// right now, this version of MatNETIO does not support Big Endian
throw new MatlabIOException("This version of MatNETIO does not support Big Endian.");
}
_matFileHeader = new MatFileHeader(description, version, endianIndicator);
}