public boolean isCompressed() {
		return (header & SquashConstants.METABLOCK_UNCOMPRESSED_MASK) == 0;
	}
Represents the metadata proceeding a data block within the SquashFS archive
@param reader A binary reader with pointer index at the start of the metadata
@throws IOException Any read operation failure
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/squashfs/SquashMetablock.java