Base36

This article is about an encoding scheme used to represent binary data as text. For the positional numeral system using the radix 36, see Base 36.

Base36 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-36 representation. The choice of 36 is convenient in that the digits can be represented using the Arabic numerals 0–9 and the Latin letters A–Z[1] (the ISO basic Latin alphabet).

Each base36 digit needs less than 6 bits of information to be represented.

Conversion

Signed 32- and 64-bit integers will only hold at most 6 or 13 base-36 digits, respectively (that many base-36 digits can overflow the 32- and 64-bit integers). For example, the 64-bit signed integer maximum value of "9223372036854775807" is "1Y2P0IJ32E8E7" in base-36. Similarly, the 32-bit signed integer maximum value of "2147483647" is "ZIK0ZJ" in base-36.

Standard implementations

The C standard library since C89 supports base36 numbers via the strtol and strtoul functions[2]

In the Common Lisp standard (ANSI INCITS 226-1994), functions like parse-integer support a radix of 2 to 36.[3]

Java SE supports conversion from/to String to different bases from 2 up to 36. For example, [1] and [2]

Just like Java, JavaScript also supports conversion from/to String to different bases from 2 up to 36. [3]

PHP, like Java, supports conversion from/to String to different bases from 2 up to 36 using the base_convert function, available since PHP 4.

Go supports conversion to string to different bases from 2 up to 36 using the built-in strconv.FormatInt(), and strconv.FormatUint() functions,[4][5] and conversions from string encoded in different bases from 2 up to 36 using the built-in strconv.ParseInt(), and strconv.ParseUint() functions.[6][7]

Python allows conversions of strings from base 2 to base 36.[8]

See also

References

  1. ^ Hope, Paco; Walther, Ben (2008), Web Security Testing Cookbook, Sebastopol, CA: O'Reilly Media, Inc., ISBN 978-0-596-51483-9
  2. ^ "strtol, strtoll — cppreference.com".
  3. ^ "Common Lisp HyperSpec". LispWorks. Retrieved 3 August 2022.
  4. ^ "Strconv package - strconv - PKG.go.dev".
  5. ^ "Strconv package - strconv - PKG.go.dev".
  6. ^ "Strconv package - strconv - PKG.go.dev".
  7. ^ "Strconv package - strconv - PKG.go.dev".
  8. ^ "Built-in Functions — Python 3.10.0 documentation".