Voici un script basé sur JScript que j'ai écrit, capable de traduire un fichier binaire en représentation hexadécimale, et inversement. Enregistrez le code sous HexEncoder.js
, ou ce que vous voulez, aussi longtemps qu'il aura l' .js
extension.
// Original script written by paulkienitz, 20110301
// http://www.codeproject.com/Messages/3718403/a-shorter-and-quicker-way-modified.aspx
// Check the parameters count
if (WScript.Arguments.length < 3)
{
WScript.Quit(2);
}
// Ensure the action parameter is long enough
if (WScript.Arguments(0).length < 2)
{
WScript.Quit(3);
}
// Detect invalid characters
var action = WScript.Arguments(0).toUpperCase().charCodeAt(1);
switch (action)
{
// 'D' or 'E'
case 0x44:
case 0x45:
break;
default:
WScript.Quit(3);
break;
}
var fso = new ActiveXObject("Scripting.FileSystemObject");
var source = WScript.Arguments(1).replace("\\", "\\\\");
// Check whether the source file actually exists
if (!fso.FileExists(source))
{
WScript.Quit(4);
}
var dest = WScript.Arguments(2).replace("\\", "\\\\");
// When we read a binary stream as ISO 8859-1 (Latin 1), we should get a
// string where each charCodeAt value matches the byte from the stream.
// Unfortunately Windows won't give you Latin 1 -- when you ask for it,
// you get code page 1252, which has extra characters stuck in for byte
// values from 128 to 159. These two strings allow us to translate between
// the bogus Windows characters and the original byte values.
var bogusWindows1252Chars =
"\u20AC\u201A\u0192\u201E\u2026\u2020\u2021" +
"\u02C6\u2030\u0160\u2039\u0152\u017D" +
"\u2018\u2019\u201C\u201D\u2022\u2013\u2014" +
"\u02DC\u2122\u0161\u203A\u0153\u017E\u0178";
// No translation is necessary for characters 0x81, 0x8D, 0x8F, 0x90, or 0x9D
var correctLatin1Chars =
"\u0080\u0082\u0083\u0084\u0085\u0086\u0087" +
"\u0088\u0089\u008A\u008B\u008C\u008E" +
"\u0091\u0092\u0093\u0094\u0095\u0096\u0097" +
"\u0098\u0099\u009A\u009B\u009C\u009E\u009F";
if (action == 0x44) // D
{
decode(source, dest);
}
else if (action = 0x45) // E
{
encode(source, dest);
}
// This turns a string read as codepage 1252 into a boxed string with a
// byteAt method.
function binaryString(str)
{
// Always return an object with a .length
var r = str ? new String(str) : new String();
r.byteAt = function(index)
{
var value = this.charCodeAt(index);
// Translate character back to originating Windows-1252 byte value
if (value > 0xff)
{
var p = bogusWindows1252Chars.indexOf(this.charAt(index));
value = correctLatin1Chars.charCodeAt(p);
}
// Convert the value to hexadecimal
var hex = value.toString(16);
return (hex.length == 2) ? hex : "0" + hex;
};
return r;
}
// Does reverse translation from bytes back to Windows-1252 characters.
function fromByte(hex)
{
var c = String.fromCharCode(parseInt(hex, 16));
var p = correctLatin1Chars.indexOf(c);
return (p == -1) ? c : bogusWindows1252Chars.charAt(p);
}
function encode(source, dest)
{
var stream = new ActiveXObject("ADODB.Stream");
stream.Type = 2 // adTypeText
stream.Charset = "iso-8859-1"; // actually Windows codepage 1252
stream.Open();
stream.LoadFromFile(source);
var chunkSize = 4096;
encodedFile = fso.OpenTextFile(dest, 2, true); // 2 = ForWriting
while (!stream.EOS)
{
var s = binaryString(stream.ReadText(chunkSize));
var tempArray = new Array();
for (var i = 0; i < s.length; i++)
{
tempArray[i] = s.byteAt(i);
}
var hexString = tempArray.join("");
if (hexString.length > 0)
{
encodedFile.Write(hexString);
}
}
encodedFile.Close();
stream.Close();
}
function decode(source, dest)
{
var chunkSize = 8192;
var encodedFile = fso.OpenTextFile(source, 1); // 1 = ForReading
var decodedFile = fso.OpenTextFile(dest, 2, true); // 2 = ForWriting
while (!encodedFile.AtEndOfStream)
{
var hexString = encodedFile.Read(chunkSize);
var tempArray = new Array();
for (var i = 0; i < hexString.length; i += 2)
{
tempArray[i >> 1] = fromByte(hexString.substring(i, i + 2));
}
var s = tempArray.join("");
if (s.length > 0)
{
decodedFile.Write(s);
}
}
decodedFile.Close();
encodedFile.Close();
}
Syntaxe
Pour encoder un fichier binaire:
cscript /nologo /e:jscript HexEncoder.js /e "binary file" "output file"
Pour revenir en arrière:
cscript /nologo /e:jscript HexEncoder.js /d "encoded file" "binary file"
Exemple d'utilisation
La commande suivante va encoder notepad.exe
et sauvegarder le résultat sur le bureau:
cscript /nologo /e:jscript HexEncoder.js /e "%windir%\notepad.exe" "%userprofile%\Desktop\notepad.exe-hex.txt"
Limitations connues
- Les fichiers encodés sont deux fois plus grands que ceux d'origine.
Le script convient mieux aux petits fichiers, par exemple moins de 1024 Ko.
Vous pouvez éventuellement contourner ces limitations en utilisant le script ci-dessus pour transférer un encodeur tiers.