/// <summary>
/// When a segment's data is compressed, it follows the following run-length algorithm:
/// If a byte of data has a value of (int)1 thru (int) 127, then the following x bytes are uncompressed.
/// If a byte of data has a value of (int)129 thru (int) 255, then the following byte is repeated 127 less times.
/// </summary>
internal override void ParseSegment(System.IO.FileStream file)
{
Length = file.Read4ByteInt();
RawDataFileOffset = (int)file.Position;
List<byte> bytes = new List<byte>();
while (file.Position < RawDataFileOffset + Length)
{
byte b = (byte)file.ReadByte();
if (b > 0 && b < 128)
{
for (int i = 0; i < b; ++i)
{
bytes.Add((byte)file.ReadByte());
}
}
else if (b > 128)
{
byte nextByte = (byte)file.ReadByte();
for (int i = 0; i < b - 127; ++i)
{
bytes.Add(nextByte);
}
}
else
{
throw new Exception("Bad compressed data byte encountered at file offset " + file.Position);
}
}
UncompressedLength = bytes.Count;
Data = bytes.ToArray();
}
internal override void ParseSection(System.IO.FileStream file)
{
// Call base parser to populate RawData, then we can parse the structures
Length = file.Read4ByteInt();
RawDataFileOffset = (int)file.Position;
List<byte> bytes = new List<byte>();
while (file.Position < RawDataFileOffset + Length)
{
// Read a byte, n. If it's < 128, read the next n bytes into the buffer.
// If it's > 128, subtract 127 and then read the next byte and duplicate n - 127 times
byte b = (byte)file.ReadByte();
if (b > 0 && b < 128)
{
//byte nextByte = (byte)file.ReadByte();
for (int i = 0; i < b; ++i)
{
bytes.Add((byte)file.ReadByte());
}
}
else if (b > 128)
{
byte nextByte = (byte)file.ReadByte();
for (int i = 0; i < b - 127; ++i)
{
bytes.Add(nextByte);
}
}
else
{
throw new Exception("Bad run-length encoding");
}
}
RawData = bytes.ToArray();
}
internal override void ParseSection(System.IO.FileStream file)
{
Length = file.Read4ByteInt();
RawDataFileOffset = (int)file.Position;
List<AltitudeDescriptor> data = new List<AltitudeDescriptor>();
while (file.Position < RawDataFileOffset + Length)
{
data.Add(new AltitudeDescriptor(file));
}
AltitudeData = new AltitudeDescriptor[128,128];
for (int i = 0; i < 128; i++)
{
for (int j = 0; j < 128; j++)
{
AltitudeData[i, 127 - j] = data[i * 128 + j];
}
}
}
