public static XZIndexRecord FromBinaryReader(BinaryReader br)
{
var record = new XZIndexRecord();
record.UnpaddedSize = br.ReadXZInteger();
record.UncompressedSize = br.ReadXZInteger();
return record;
}
public static BlockFilter Read(BinaryReader reader)
{
var filterType = (FilterTypes)reader.ReadXZInteger();
if (!FilterMap.ContainsKey(filterType))
throw new NotImplementedException($"Filter {filterType} has not yet been implemented");
var filter = Activator.CreateInstance(FilterMap[filterType]) as BlockFilter;
var sizeOfProperties = reader.ReadXZInteger();
if (sizeOfProperties > int.MaxValue)
throw new InvalidDataException("Block filter information too large");
byte[] properties = reader.ReadBytes((int)sizeOfProperties);
filter.Init(properties);
return filter;
}
private void ReadBlockFlags(BinaryReader reader)
{
var blockFlags = reader.ReadByte();
_numFilters = (blockFlags & 0x03) + 1;
byte reserved = (byte)(blockFlags & 0x3C);
if (reserved != 0)
throw new InvalidDataException("Reserved bytes used, perhaps an unknown XZ implementation");
bool compressedSizePresent = (blockFlags & 0x40) != 0;
bool uncompressedSizePresent = (blockFlags & 0x80) != 0;
if (compressedSizePresent)
CompressedSize = reader.ReadXZInteger();
if (uncompressedSizePresent)
UncompressedSize = reader.ReadXZInteger();
}
