BASE64ENC

BASE64ENC 2080 enhanced

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Action

Converts a string into the Base-64 representation.

 

 

Syntax

Result = BASE64ENC( source)

Result = BASE64ENC( array, length)

 

 

Remarks

Result

A string variable that is assigned with the base64 coded string.

Source

The source string that must be coded.

array

The first element of a byte array.

length

The number of elements to convert. Maximum 255.

 

Base-64 is not an encryption protocol. It sends data in 7-bit ASCII data format. MIME, web servers, and other Internet servers and clients use Base-64 coding.

 

The provided Base64Enc() function is an encoding function. You need it when you want to send attachments with POP3 for example.

The target string will use 1 additional byte for every 3 bytes. This means that the target string is ca. 33 % longer than the source string.

So make sure the target string is dimensioned longer then the original string.

 

Because strings can not contain a 0 byte, there is an alternative syntax. Instead of a string you pass the address of a byte array that contains the data you want to convert.

Because there is no end of string marker, you must provide the number of elements to convert.

 

 

See also

CONFIG TCPIP, GETSOCKET , SOCKETCONNECT, SOCKETSTAT , TCPWRITE, TCPWRITESTR, CLOSESOCKET , SOCKETLISTEN , BASE64DEC, URL2IP

 

 

Example

$regfile = "m48def.dat"                                   ' specify the used micro

$crystal = 8000000                                         ' used crystal frequency

$baud = 19200                                               ' use baud rate

$hwstack = 32                                               ' default use 32 for the hardware stack

$swstack = 10                                               ' default use 10 for the SW stack

$framesize = 40                                             ' default use 40 for the frame space

$lib "tcpip.lbx"

Config Com1 = Dummy , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0

 

 

Dim S As String * 15 , Z As String * 15

 

S = "bWFyazptYXJr"

Z = Base64dec(s)

Print Z                                                     'mark:mark

s = Base64Enc(z)

Print s

End

 

 

 

Example 2

$regfile = "m32U4def.dat"
$crystal = 16000000
$baud = 19200
 
Dim S As String * 80 , Z As String * 80 , B As Byte , J As Byte
Dim Ar(81) As Byte At S Overlay
 
S = "This is a test"
'while we load the array with string data, we could load it with any data that can contain a 0.
 
B = Len(s) + 1                                             'get the length and the 0 byte
Z = Base64enc(ar(1) , B)                                   'use an array
Print Z
 
Ar(1) = Base64dec(z , B)                                   'now B will hold the number of elements
 
Print B
 
'Another example
Ar(1) = 0 : Ar(2) = 1 : Ar(3) = 2
Z = Base64enc(ar(1) , 3)                                   'use an array
Print Z
 
 
Ar(1) = Base64dec(z , B)                                   'now B will hold the number of elements
For J = 1 To B
  Print Ar(j)
Next
End