Base36

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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[edit]

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

Standard implementations[edit]

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. Use the base_convert function, available since PHP 4.

Python implementation[edit]

Python Code to encode BASE36 from BASE10[2]

 0 def base36encode(integer):
 1     chars, encoded, sign = '0123456789abcdefghijklmnopqrstuvwxyz', '', ''
 2     
 3     if integer < 0:
 4         sign = '-'
 5         integer = -1*integer
 6         
 7     elif integer == 0:
 8             sign = '0'
 9 
10     while integer > 0:
11         integer, remainder = divmod(integer, 36)
12         encoded = chars[remainder] + encoded
13 
14     return sign+encoded

Visual Basic .NET implementation[edit]

Public Function ToBase36String(i as UInteger) As String
    Const rainbow = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    Dim sb = New StringBuilder()
    Do
        sb.Insert(0, rainbow(i Mod 36))
        i /= 36
    Loop While i <> 0
    Return sb.ToString()
End Function

See also[edit]

References[edit]

  1. ^ Hope, Paco; Walther, Ben (2008), Web Security Testing Cookbook, Sebastopol, CA: O'Reilly Media, Inc., ISBN 978-0-596-51483-9 
  2. ^ "http://www.2techup.com/base36/". 2TechUp.  External link in |title= (help);

External links[edit]