/// <summary>
/// Initializes a Header from the specified <see cref="FieldTrip.Buffer.ByteBuffer"/>.
/// </summary>
/// <param name="buf">The buffer to read the header from.</param>
public Header(ByteBuffer buf)
{
NumChans = buf.GetInt();
NumSamples = buf.GetInt();
NumEvents = buf.GetInt();
FSample = buf.GetFloat();
DataType = buf.GetInt();
int size = buf.GetInt();
Labels = new string[NumChans];
while (size > 0) {
int chunkType = buf.GetInt();
int chunkSize = buf.GetInt();
byte[] bs = new byte[chunkSize];
buf.Get(ref bs);
if (chunkType == CHUNK_CHANNEL_NAMES) {
int n = 0, len = 0, index = 0;
for (int pos = 0; pos < chunkSize; pos++) {
if (bs[pos] == 0) {
if (len > 0) {
Labels[n] = Encoding.Default.GetString(bs, index, len);
index = pos + 1;
}
len = 0;
if (++n == NumChans)
break;
} else {
len++;
}
}
} else {
// ignore all other chunks for now
}
size -= 8 + chunkSize;
}
}
public static int Count(ByteBuffer buf)
{
int num = 0;
long pos = buf.Position;
while (buf.Remaining >= 32) {
int typeType = buf.GetInt();
int typeNumEl = buf.GetInt();
int valueType = buf.GetInt();
int valueNumEl = buf.GetInt();
buf.GetInt(); // sample
buf.GetInt(); // offset
buf.GetInt(); // duration
int size = buf.GetInt();
int sizeType = typeNumEl * DataType.wordSize[typeType];
int sizeValue = valueNumEl * DataType.wordSize[valueType];
if (sizeType < 0 || sizeValue < 0 || sizeType + sizeValue > size) {
return -(1 + num);
}
buf.Position = buf.Position + size;
num++;
}
buf.Position = pos;
return num;
}
public BufferEvent(ByteBuffer buf)
{
wType = new WrappedObject();
wValue = new WrappedObject();
wType.Type = buf.GetInt();
wType.Numel = buf.GetInt();
wValue.Type = buf.GetInt();
wValue.Numel = buf.GetInt();
Sample = buf.GetInt();
Offset = buf.GetInt();
Duration = buf.GetInt();
int size = buf.GetInt();
wType.Array = DataType.GetObject(wType.Type, wType.Numel, buf);
if (wType.Array != null) {
wType.Size = wType.Numel * DataType.wordSize[wType.Type];
}
wValue.Array = DataType.GetObject(wValue.Type, wValue.Numel, buf);
if (wValue.Array != null) {
wValue.Size = wValue.Numel * DataType.wordSize[wValue.Type];
}
size -= wType.Size + wValue.Size;
if (size != 0) {
buf.Position = buf.Position + size;
}
}