/// <summary>
/// Decodes and decompresses the container.
/// </summary>
/// <param name="buffer"> The buffer. </param>
/// <returns> The decompressed container. </returns>
/// <exception cref="IOException"> if an I/O error occurs. </exception>
public static Container Decode(ByteBuffer buffer)
{
/* decode the type and length */
var type = buffer.get() & 0xFF;
var length = buffer.getInt();
/* check if we should decompress the data or not */
if (type == COMPRESSION_NONE)
{
/* simply grab the data and wrap it in a buffer */
var temp = new byte[length];
buffer.get(temp);
var data = ByteBuffer.wrap(temp);
/* decode the version if present */
var version = -1;
if (buffer.remaining() >= 2)
{
version = buffer.getShort();
}
/* and return the decoded container */
return(new Container(type, data, version));
}
else
{
/* grab the length of the uncompressed data */
var uncompressedLength = buffer.getInt();
/* grab the data */
var compressed = new byte[length];
buffer.get(compressed);
/* uncompress it */
byte[] uncompressed;
if (type == COMPRESSION_BZIP2)
{
uncompressed = CompressionUtils.Bunzip2(compressed);
}
else if (type == COMPRESSION_GZIP)
{
uncompressed = CompressionUtils.Gunzip(compressed);
}
else
{
throw new IOException("Invalid compression type");
}
/* check if the lengths are equal */
if (uncompressed.Length != uncompressedLength)
{
throw new IOException("Length mismatch");
}
/* decode the version if present */
var version = -1;
if (buffer.remaining() >= 2)
{
version = buffer.getShort();
}
/* and return the decoded container */
return(new Container(type, ByteBuffer.wrap(uncompressed), version));
}
}