Debugging sometimes means dumping a hex stream to the console, or to a log file, something like 0x0a 0xff…

I wrote a simple command line tool to convert that kind of hex data to binary. Users of Linux can resort to the fine xxd utility to do the same thing.

The following are all valid hex values and produce the same binary

• “0xDE 0xAD”
• “0xDE0xAD”
• “0xD E0xAD”
• “0xD\r\nE0xAD”
• “0xDE\r\n 0xAD”
• “0xDE\n 0xAD”
• “0xDE\r 0xAD”
• “0xD\r\nE 0xAD”
• “0x00DE 0xAD”
• “DE AD”
• “DEAD”
• “DEA D”
• “DEA\r\nD”

The following are invalid and will result in an error

• “0x01DE 0xAD”
• “0xDExAD”
• “0xDE AD”