public static TpsRecord GetRecord(Stream inputStream, TpsRecord previous)
{
var buffer = new byte[2];
var flags = (byte)inputStream.ReadByte();
short recordLength;
short headerLength;
if ((flags & 0x80) != 0)
{
inputStream.Read(buffer, 0, 2);
recordLength = BitUtil.ToInt16(buffer, 0);
}
else
{
recordLength = (short)(previous.Data.Length + previous.Header.Length);
}
if ((flags & 0x40) != 0)
{
inputStream.Read(buffer, 0, 2);
headerLength = BitUtil.ToInt16(buffer, 0);
}
else
{
headerLength = (short)previous.Header.Length;
}
var copy = flags & 0x3F;
byte[] allData;
try
{
allData = new byte[recordLength];
if (copy > 0)
{
Array.Copy(previous.Header, 0, allData, 0,
copy > previous.Header.Length ? previous.Header.Length : copy);
if (copy > previous.Header.Length)
{
Array.Copy(previous.Data, 0, allData, previous.Header.Length, copy - previous.Header.Length);
}
}
inputStream.Read(allData, copy, allData.Length - copy);
}
catch (Exception ex)
{
throw new InvalidOperationException(
"When reading " + (recordLength - copy) + " bytes of TpsRecord at " +
inputStream.Position, ex);
}
var header = new byte[headerLength];
var data = new byte[recordLength - headerLength];
Array.Copy(allData, 0, header, 0, headerLength);
Array.Copy(allData, headerLength, data, 0, recordLength - headerLength);
return(CreateRecord(header, data));
}
public void ParseRecords()
{
if (IsFlushed())
{
Uncompress();
}
Records.Clear();
// Skip pages with non 0x00 flags as they don't seem to contain TpsRecords.
if (Flags == 0x00)
{
using (var stream = new MemoryStream(_data))
{
TpsRecord prev = null;
do
{
var current = prev == null?TpsRecord.GetRecord(stream) : TpsRecord.GetRecord(stream, prev);
Records.Add(current);
prev = current;
} while (stream.Position != stream.Length - 1 && Records.Count < RecordCount);
}
}
}