private long getCompressedSize(byte[] dataFileSignature) throws IOException {
        BitReader reader = new BitReader(dataFileSignature, 0);
        reader.readUInt32(32);
        return reader.readUInt64(64);
    }
This method is used to get the compressed size value from the data file signature.

@param dataFileSignature Specify the signature of the zip file content.
@return Return the compressed size value.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/onenote/fsshttpb/streamobj/chunking/ZipFilesChunking.java