Online Base64 Encoder

i am a little bit cofused about three ways encoding of php codes (base64 & str_rot13 & gzinflate!)specially for str_rot13 and gzinflate ways.
the latest php file after encoding should be like this :

<?phpeval(gzinflate(str_rot13(base64_decode('Your Encoded string'))));?>

for example this is my php codes:

<?phpecho('This Is A PHP Code');?>

learn me step by step how to encode these php codes?
i could n't find any online encoders about this, just many decoders!
i am looking for the fastest ways, because i want to use these encoding method always.
i think the step 1 and 2 are like below :
1- convert that php codes to this :

?><?phpecho('This Is A PHP Code');?><?php

2-encode codes in step 1 form here :
base_64 encoder
3-?????? help me

really appreciate for attention

I am looking for a way to decode very big (1.5Gb) base64 string from a file without getting OutOfMemoryException. I've tried this method for encoding.Can you suggest me a way to do it?

Thanks in advance!!

EDIT:

Encrytion code:

 public static string HighLevelEncryptionAES(byte[] plainDataBytes, byte[] keyBytes)        {            CryptoSecurityClass cryptoSecurity = new CryptoSecurityClass();            AesCryptoServiceProvider serviceProvider = cryptoSecurity.GetAesProvider(keyBytes);            ICryptoTransform encryptor = serviceProvider.CreateEncryptor();            byte[] encryptedBytes = encryptor.TransformFinalBlock(plainDataBytes, 0, plainDataBytes.Length);            string encryptedString = Convert.ToBase64String(encryptedBytes);            return encryptedString;        }

AES provider class:

    private AesCryptoServiceProvider GetAesProvider(byte[] key)            {                return new AesCryptoServiceProvider()                {                    KeySize = 256,                    Key = key,                    BlockSize = 128,                    Padding = PaddingMode.PKCS7,                    Mode = CipherMode.ECB                };}

I trying to develop an android application that enables the user to add a picture from his gallery, it works fine and displays the picture in the image view.the problem is I am trying to save this picture in MySQL database (not URL or path of it) I want to store as a blob.I tried the below code to get the image from user's gallery and display it in the image view.The attribute test2 is a string and it is what I save in the database

if (requestCode == GET_FROM_GALLERY && resultCode == Activity.RESULT_OK && data != null) {    Uri selectedImageUri = data.getData();    imagepath = getPath(selectedImageUri);}////// editBitmap image = BitmapFactory.decodeFile(imagepath);FinalBytes = getBytes(image); // this will be save in DBBitmap getIt = getBitmap(FinalBytes);imgV.setImageBitmap(getIt);imgV.setDrawingCacheEnabled(true);imgV.buildDrawingCache();Bitmap testbit = imgV.getDrawingCache();ByteArrayOutputStream testbyte = new ByteArrayOutputStream();testbit.compress(Bitmap.CompressFormat.JPEG, 100, testbyte);testbyte2 = testbyte.toByteArray();base64Image = Base64.encodeToString(testbyte2, Base64.DEFAULT);

I used below code for retrieving the image

byte[] decodedString = Base64.decode(Recipes[position].getRimage(), Base64.DEFAULT);Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);holder.image.setImageBitmap(decodedByte);

But I am getting this message when decoding it.

illegalargumentexception bad base 64

please help I spent 2 days on this error

I have a valid Base 64 encoded string - someBase64String to which an invalid suffix (e.g. _002_CWLP265MB136330847F70EDE0813A5AC4C3A80CWLP265MB1363GBRP_--) has been added.

I want to split the string back to valid Base 64 encoded prefix and invalid suffix.

This Matches a base 64 encoded string

Regex rg = new Regex("^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$"); 

rg.Match(someBase64String) will return true if it is a valid base 64 string

When added to the someBase64String this string --_002_CWLP265MB136330847F70EDE0813A5AC4C3A80CWLP265MB1363GBRP_-- is added at the end of the base64encoded string which causes the conversion of the whole base64 string to fail. the rg.Match(someBase64String) will also return false.

In the case of an invalid base64 string(as described above), I need to extract the part/characters of the string that causes the conversion to fail; namely _002_CWLP265MB136330847F70EDE0813A5AC4C3A80CWLP265MB1363GBRP_-- in this case.

I'm writing a client-side code in JS , which should be compatible with a third-party c# service which I cannot modify at all.

The service supplies a base64 unicode encoded string (a JSON), for the sake of the (simplified) example this is the c# code:

var myString = Encoding.Unicode.GetBytes("{\"counter\":0}");var encodedString = Convert.ToBase64String(myString);

which results in : "ewAiAGMAbwB1AG4AdABlAHIAIgA6ADAAfQA="

now I need to update this encoded JSON at the client-side, and return a valid base64 string which will be decoded by this C# code:

byte[] bytes = Convert.FromBase64String(encodedString);string decodedString = Encoding.Unicode.GetString(bytes);

All the solutions/examples I've found online resulted in the decoding functions to output a invalid result.for example, when using the basic window.btoa("{\"counter\":1}") resulted in eyJjb3VudGVyIjoxfQ==which in turn , when decoding on the c# app, will be cause a format exception at best, or result in total gibberish.

any Ideas?