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add steganograpy example

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rolux 2012-04-13 23:22:56 +02:00
parent 37f3bf8f51
commit 036d51e7b5
5 changed files with 127 additions and 0 deletions
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17
examples/steganography/css/example.css Normal file
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body {
margin: 0;
}
table {
border-spacing: 8px;
}
td {
padding: 0;
border-collapse: collapse;
font-family: Lucida Grande, Segoe UI, DejaVu Sans, Lucida Sans Unicode, Helvetica, Arial, sans-serif;
font-size: 12px;
vertical-align: top;
//background: red;
}
td:first-child {
width: 320px;
}

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examples/steganography/index.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>Steganograpy</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<link rel="shortcut icon" type="image/png" href="../../source/Ox.UI/png/icon16.png"/>
<link rel="stylesheet" type="text/css" href="css/example.css"/>
<script type="text/javascript" src="../../dev/Ox.js"></script>
<script type="text/javascript" src="js/example.js"></script>
</head>
<body>
</body>
</html>

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examples/steganography/js/example.js Normal file
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'use strict';
Ox.load('Image', function() {
var $body = Ox.$('body'),
$table = Ox.$('<table>').appendTo($body),
$tr,
text = {
iceland: 'The first image he told me about '
+ 'was of three children on a road in Iceland in 1965.',
vietnam: 'He said for him it was the image of happiness, '
+ 'and that he had often tried to link it to other images, '
+ 'but it had never worked.'
},
i = 0;
encode(decode);
function encode(callback) {
status('Load iceland.png');
Ox.Image('png/iceland.png', function(iceland) {
result(Ox.$('<img>').attr({src: iceland.src()}));
status(
'Encode the text <i>"' + text.iceland + '"</i> into '
+ 'the least significant bits of iceland.png'
);
iceland.encode(text.iceland, false, 1, function(iceland) {
result(Ox.$('<img>').attr({src: iceland.src()}));
status('Load vietnam.png');
Ox.Image('png/vietnam.png', function(vietnam) {
result(Ox.$('<img>').attr({src: vietnam.src()}));
status(
'Encode the text <i>"' + text.vietnam + '"</i> into'
+ ' the least significant bits of vietnam.png'
);
vietnam.encode(text.vietnam, false, 1, function(vietnam) {
result(Ox.$('<img>').attr({src: vietnam.src()}));
status(
'Encode vietnam.png into iceland.png '
+ 'by flipping the second least significant bits'
);
iceland.encode(vietnam.src(), -1, function(iceland) {
result(Ox.$('<img>').attr({src: iceland.src()}));
callback(iceland);
});
});
});
});
});
}
function decode(iceland) {
status('Decode the least signigicant bits of iceland.png');
iceland.decode(false, 1, function(str) {
result(str);
status('Decode all bits of iceland.png');
iceland.decode(-1, function(src) {
result(
Ox.sub(src, 0, 32) + '<i> ... ['
+ Ox.formatNumber(src.length - 64)
+ ' more bytes] ... </i>' + Ox.sub(src, -32)
);
status('Load as vietnam.png');
Ox.Image(src, function(image) {
result(Ox.$('<img>').attr({src: src}));
status('Decode the least significant bits of vietnam.png');
image.decode(false, 1, function(str) {
result(str);
});
});
});
});
}
function status(value) {
var $td = Ox.$('<td>');
if (Ox.isString(value)) {
$td.html(
value.replace(/(\w+\.png)/g, '<b>$1</b>')
);
} else {
$td.append(value);
}
$tr = Ox.$('<tr>').append($td).appendTo($table);
}
function result(value) {
var $td = Ox.$('<td>');
if (Ox.isString(value)) {
$td.html(value);
} else {
$td.append(value);
}
$tr.append($td)
}
});

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