Base64Decode
Script function

world.Base64Decode

DOC_scripting Read about scripting

Type

Method

Summary

Takes a base-64 encoded string and decodes it.

Prototype

VARIANT Base64Decode(BSTR Text);

DOC_data_types View list of data type meanings

Description

Takes a base-64 encoded string (eg. "TmljayBHYW1tb24=") and decodes it. The string may contain space characters (including carriage-return/newline) which will be removed.

The string to be decoded must contain valid base-64 characters, and must be a multiple of 4 characters long (once spaces are removed), or a NULL variant will be returned.

The valid base-64 characters are:

'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'

Also, '=' is used as a padding character if the original text to be encoded was not exactly a multiple of 3 characters long.

Because of the way strings are stored this will not work with strings which have nulls in them (hex 00), however see below for a work-around for Lua.

VBscript example

world.note world.Base64Decode ("TmljayBHYW1tb24=")


Jscript example

world.note (world.Base64Decode ("TmljayBHYW1tb24="));


PerlScript example

$world->note ($world->Base64Decode ("TmljayBHYW1tb24="));


Python example

world.note (world.Base64Decode ("TmljayBHYW1tb24="))


Lua example

Note (Base64Decode ("TmljayBHYW1tb24="))


Lua notes

In MUSHclient version 3.57 onwards you can also use 

decoded_string = utils.base64decode (s)

This works the same as described above, however it will correctly handle strings with the null (hex 00) character in them.

This function works a bit differently if it encounters "bad" data:

* Characters not in the set shown above are silently ignored

* If the source string is not a multiple of four characters, the string is still processed, however up to the last 3 bytes will not be returned.


Return value

The decoded string, or a NULL variant if the input string was not a multiple of 4 characters in length, once spaces were removed, or did not contain the valid base-64 characters listed above.

Note that due to the way strings are represented internally, it is not possible for the decoded string to contain the NULL character (hex 0x00) and be returned correctly.



See Also ...

Topics

DOC_scripting Scripting
DOC_utils Utilities

Functions

FNC_Base64Encode Base64Encode (Encodes a string using base-64 encoding.)
FNC_ChangeDir ChangeDir (Changes the MUSHclient working directory)
FNC_CreateGUID CreateGUID (Creates a GUID - Global Unique Identifier)
FNC_EditDistance EditDistance (Returns the Levenshtein Edit Distance between two words)
FNC_ErrorDesc ErrorDesc (Converts a MUSHclient script error code into an human-readable description)
FNC_ExportXML ExportXML (Exports a world item in XML format)
FNC_FixupEscapeSequences FixupEscapeSequences (Converts "escape sequences" like \t to their equivalent codes.)
FNC_FixupHTML FixupHTML (Fixes up text for writing as HTML)
FNC_GenerateName GenerateName (Generates a random character name)
FNC_GetClipboard GetClipboard (Gets the clipboard contents)
FNC_GetScriptTime GetScriptTime (Returns the amount of time spent in script routines)
FNC_GetUniqueID GetUniqueID (Creates a unique ID for general use, or for making Plugin IDs)
FNC_GetUniqueNumber GetUniqueNumber (Returns a unique number)
FNC_Hash Hash (Produces a hash (checksum) of a specified piece of text)
FNC_Help Help (Shows help for a script function, or a list of functions)
FNC_ImportXML ImportXML (Imports configuration data in XML format)
FNC_Metaphone Metaphone (Returns the metaphone code for the supplied word)
FNC_MtRand MtRand (Returns pseudo-random number using the Mersenne Twister algorithm)
FNC_MtSrand MtSrand (Seed the Mersenne Twister pseudo-random number generator)
FNC_ReadNamesFile ReadNamesFile (Loads in a file for generating character names)
FNC_Replace Replace (Replaces one substring with another)
FNC_SetClipboard SetClipboard (Sets the clipboard contents)
FNC_SetStatus SetStatus (Sets the status line text)
FNC_Simulate Simulate (Simulate input from the MUD, for debugging purposes)
FNC_Sound Sound (Plays a sound)
FNC_StripANSI StripANSI (Strips ANSI colour sequences from a string)
FNC_Trace Trace (Trace mode property)
FNC_TraceOut TraceOut (Outputs the supplied message to the world Trace)
FNC_TranslateGerman TranslateGerman (Translate German umluat sequences)
FNC_Transparency Transparency (Sets the transparency of the main MUSHclient window under Windows XP)
FNC_Trim Trim (Trims leading and trailing spaces from a string)

(Help topic: function=Base64Decode)

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