Is there a way to decrypt the goods? For example, if I received the product barcode then, using some libraries, find out what it is product? For example, apple juice, one liter of a particular company. What is the way to solve this problem? Now I'm is not interested decision on some platform. I asking show me some decisions this problem.
Read this: GSDN Database which listed 11 million items as of about 18 months ago. I've no doubt you would be able to gain access to this database if required - it's managed by the world-wide authority.
Item barcodes may be 13, 12 or 8 digits long - there are formulæ to convert the shorter code to 13-digit. All systems were supposed to be converted to 13-digit many years ago so that there was no need for a product bearing a 13-digit barcode to also require a UPC-A (12-digit) code for use in the US.
The general scheme is to use the first 2, sometimes 3 digits for a country code, then allot a company code and item number (assigned by the company) and then a check digit. The actual number of digits assigned to the company code and item varies with the local GS1 office, but the total of country+company+item digits must be 12 + 1 check digit=13.
As an example, Australia uses country 93, then either 5 or 7 digits for company code (depending on expected number of products) then 5 or 3 digits for the item code.