Hyper Dictionary

English Dictionary Computer Dictionary Video Dictionary Thesaurus Dream Dictionary Medical Dictionary


Search Dictionary:  

Meaning of CHARACTER ENCODING

 
Matching Terms:  character encoding scheme

Computing Dictionary
 
 Definition: 

(Or "character encoding scheme") A mapping of binary values to code positions and back; generally a 1:1 (bijective) mapping.

In the case of ascii, this is generally a f(x)=x mapping: code point 65 maps to the byte value 65, and vice versa. This is possible because ASCII uses only code positions representable as single bytes, i.e., values between 0 and 255, at most. (us-ascii only uses values 0 to 127, in fact.)

unicode and many cjk coded character sets use many more than 255 positions, requiring more complex mappings: sometimes the characters are mapped onto pairs of bytes (see dbcs). In many cases, this breaks programs that assume a one-to-one mapping of bytes to characters, and so, for example, treat any occurrance of the byte value 13 as a carriage return. To avoid this problem, character encodings such as utf-8 were devised.

 

 

COPYRIGHT © 2000-2013 HYPERDICTIONARY.COM HOME | ABOUT HYPERDICTIONARY