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  Classes of Rubens Takiguti Ribeiro  >  ASCII85 - binary to text  >  example.php  >  Download  
File: example.php
Role: Example script
Content type: text/plain
Description: Example of use
Class: ASCII85 - binary to text
Encoding and decoding data in ASCII85 encoding
Author: By
Last change: Phrase correction:
"The idea is to represent a tuple of four bytes as as tuple of five printable characters."

"The idea is to represent a tuple of four bytes as a tuple of five printable characters."
Date: 6 years ago
Size: 3,415 bytes


Class file image Download
// Some examples of class usage

$text 'A text with many zero-bytes ('.str_repeat(chr(0), 10).') and many spaces ('.str_repeat(' '10).') end.';

// Encode using DEFAULT algorithm
$basic_encoded ascii85::encode($textascii85::BASIC72);
try {
$basic_decoded ascii85::decode($basic_encoded);
} catch (
Exception $e) {
$basic_decoded 'Error '.$e->getCode().': '.$e->getMessage();

// Encode using ADOBE variation
$adobe_encoded ascii85::encode($textascii85::ADOBE72);
try {
$adobe_decoded ascii85::decode($adobe_encodedascii85::ADOBE);
} catch (
Exception $e) {
$adobe_decoded 'Error '.$e->getCode().': '.$e->getMessage();

// Encode using BTOA variation
$btoa_encoded ascii85::encode($textascii85::BTOA72);
try {
$btoa_decoded ascii85::decode($btoa_encodedascii85::BTOA);
} catch (
Exception $e) {
$btoa_decoded 'Error '.$e->getCode().': '.$e->getMessage();

// Format ant print result
$text          htmlentities($text,          ENT_COMPAT'UTF-8');
$basic_encoded htmlentities($basic_encodedENT_COMPAT'UTF-8');
$basic_decoded htmlentities($basic_decodedENT_COMPAT'UTF-8');
$adobe_encoded htmlentities($adobe_encodedENT_COMPAT'UTF-8');
$adobe_decoded htmlentities($adobe_decodedENT_COMPAT'UTF-8');
$btoa_encoded  htmlentities($btoa_encoded,  ENT_COMPAT'UTF-8');
$btoa_decoded  htmlentities($btoa_decoded,  ENT_COMPAT'UTF-8');

header('Content-type: text/html; charset=UTF-8');
echo <<<HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<title>Example of ASCII85 Class usage</title>
<style type="text/css" rel="stylesheet"><!--
pre { border: 1px solid #000000; background-color: #FFFFFF; padding: .5em; }
h2 { margin: 0; }
div { padding: 1em; margin-bottom: .2em; }
.basic { border: 1px outset #EEEEFF; background-color: #EEEEFF; }
.adobe { border: 1px outset #EEFFEE; background-color: #EEFFEE; }
.btoa { border: 1px outset #FFEEEE; background-color: #FFEEEE; }

<h1>Example of Ascii85 Class usage</h1>
<p>Original text:<br /><pre>

<div class="basic">
<p>Definition: this algorithm convert a binary sequence to a text sequence using 
   basicaly 85 characters. The idea is to represent a tuple of four bytes as
   a tuple of five printable characters.</p>
<p>Encoded:<br /><pre>
<p>Decoded:<br /><pre>

<div class="adobe">
<h2>Adobe Variant</h2>
<p>Diferences: this variant is delimited by &lt;~ and ~&gt;.
   It uses "z" character to represent a tuple with four
   zero-byte (0x00).</p>
<p>Encoded:<br /><pre>
<p>Decoded:<br /><pre>

<div class="btoa">
<h2>BTOA Variant</h2>
<p>Diferences: this variant is delimited by "xbtoa Begin" and "xbtoa End".
   It includes some verification data (text length, check XOR, check SUM and check ROT).
   It uses "z" character to represent a tuple with four zero-byte (0x00) and
   "y" character to represent a tuple with four white-space (0x22).</p>
<p>Encoded:<br /><pre>
<p>Decoded:<br /><pre>