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Might a base64 encoded string contain whitespace? Specifically, could it contain whitespace at the end of the string?
PS. I'm thinking about the whole "MySQL will trim trailing whitespace when storing strings in VARCHAR fields" here ;-)
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The base 64 digits in ascending order from zero are the uppercase characters 'A' to 'Z', lowercase characters 'a' to 'z', numerals '0' to '9', and the symbols '+' and '/'. % is not allowed in base64 encoding.
There is a waste of 2 bits for each 8 bits of transmission data. Â To send three bytes of information (3 times 8 is 24 bits), you need to use four bytes (4 times 6 is again 24 bits). Thus the base64 version of a file is 4/3 larger than it might be. So we use 33% more storage than we could.
Base64 only contains A–Z , a–z , 0–9 , + , / and = . So the list of characters not to be used is: all possible characters minus the ones mentioned above. For special purposes .
The BASE64ENCODE function returns the Base64 encoded version of the binary values of a character string. The schema is SYSTOOLS. A character expression to be encoded. The maximum length in 2732 characters.
No it can't. See Base64 for the allowed character repository used by base64, which are the characters A-Z, a-z, 0-9, + and / (the last two may differ depending on the implementation) as well as the padding character = (but that's also implementation dependent as some implementations don't use padding at all).
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