private static void BlockDecompress(Stream stream, byte[] outData)
{
while (stream.Position < stream.Length)
{
var header = BinaryHelpers.ReadStruct <CIPHeader>(stream);
if (header.Magic != 0x55441122)
{
throw new InvalidDataException($"Invalid magic! Expected 0x55441122, got 0x{header.Magic:X8}");
}
var data = new byte[header.CSize - 24];
var decompressed = new byte[header.USize];
if (stream.Read(data, 0, data.Length) != data.Length)
{
throw new InvalidDataException($"Failed to read {data.Length} bytes from stream");
}
Compression.Decompress(data, decompressed);
Array.ConstrainedCopy(
decompressed,
0,
outData,
header.UPos,
decompressed.Length);
}
}
/// <summary>
/// Reads a compressed-in-place file. This involves reading a header and then
/// proceeding to a shared routine for decompression.
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static byte[] ReadBlockFile(Stream stream)
{
var br = new BinaryReader(stream);
var fileHeader = BinaryHelpers.ReadStruct <CIPFileHeader>(br);
if (fileHeader.Magic != 0x66113388)
{
throw new InvalidDataException("Invalid header");
}
var data = new byte[fileHeader.USize];
BlockDecompress(stream, data);
return(data);
}