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ByteBuffer Missing Data When decoded As string


ByteBuffer Missing Data When decoded As string

By : user2185682
Date : November 22 2020, 04:01 AM
it fixes the issue Okay so you are trying to read an int from the Buffer which takes up 4 bits and then trying to get the whole data after reading 4 bits
What I have done is call messageBuffer2.clear(); after reading the int to resolve this issue. here is the full code
code :
System.out.println(messageBuffer2.getInt());
byte[] data = new byte[messageBuffer2.limit()];
messageBuffer2.clear();
messageBuffer2.get(data);
String dataString = new String(data, StandardCharsets.ISO_8859_1);
System.out.println(dataString);
35
   #CARR0033TRANSACTION IGNORED+


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how to encrypt string data so that it can only be decoded by the computer it resides on?

how to encrypt string data so that it can only be decoded by the computer it resides on?


By : shirin
Date : March 29 2020, 07:55 AM
it helps some times An asymmetric algorithm could be used like so:
The server generates a pair of private/public keys Client asks server (via AJAX) its public key Client encrypts data with the public key Client sends encrypted data to server Server uses private key to decrypt data
Missing some absolute methods on ByteBuffer

Missing some absolute methods on ByteBuffer


By : XYQuadrat
Date : March 29 2020, 07:55 AM
wish of those help One way to get the methods you need is to have a second ByteBuffer sharing the same memory, so you can change its position without changing the position of the original.
Unfortunately, the slice method does not take a position parameter either; instead it uses the current position of the original buffer. So you cannot do:
code :
dstBuffer.slice(100).put(srcBuffer);
dstBuffer.slice().position(desiredPosition - dstBuffer.position()).put(srcBuffer);
System.arraycopy(
    srcBuffer.array(), srcBuffer.arrayOffset() + srcBuffer.position(),
    dstBuffer.array(), dstBuffer.arrayOffset() + desiredPosition,
    srcBuffer.remaining()
);
synchronize (lock) {
    int originalPosition = dstBuffer.position();
    dstBuffer.position(desiredPosition);
    dstBuffer.put(srcBuffer);
    dstBuffer.position(originalPosition);
}
private static final sun.misc.Unsafe UNSAFE;
static {
    Object result = null;
    try {
        Class<?> klass = Class.forName("sun.misc.Unsafe");
        for (Field field : klass.getDeclaredFields()) {
            if (field.getType() == klass &&
                (field.getModifiers() & (Modifier.FINAL | Modifier.STATIC)) ==
                    (Modifier.FINAL | Modifier.STATIC)) {
                field.setAccessible(true);
                result = field.get(null);
                break;
            }
        }
    } catch (Throwable t) {}
    UNSAFE = result == null ? null : (sun.misc.Unsafe)result;
}

private static final Field ADDRESS_FIELD;
static {
    Field f;
    try {
        f = Buffer.class.getDeclaredField("address");
        f.setAccessible(true);
    } catch (NoSuchFieldException | SecurityException e) {
        f = null;
    }
    ADDRESS_FIELD = f;
}


public static void absolutePut(ByteBuffer dstBuffer, int dstPosition, ByteBuffer srcBuffer) {
    if (!srcBuffer.isDirect()) {
        absolutePut(dstBuffer, dstPosition,
            srcBuffer.array(), srcBuffer.arrayOffset() + srcBuffer.position(),
            srcBuffer.remaining());
        return;
    }

    if (UNSAFE != null && ADDRESS_FIELD != null && dstBuffer.isDirect()) {
        try {
            long dstAddress = (long)ADDRESS_FIELD.get(dstBuffer) + dstPosition;
            long srcAddress = (long)ADDRESS_FIELD.get(srcBuffer) + srcBuffer.position();
            UNSAFE.copyMemory(srcAddress, dstAddress, srcBuffer.remaining());
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    } else {
        // fallback to basic loop
        for (int i = srcBuffer.position(); i < srcBuffer.limit(); i++) {
            dstBuffer.put(dstPosition + i, srcBuffer.get(i));
        }
    }
}

public static void absolutePut(ByteBuffer dstBuffer, int dstPosition, byte[] src, int srcOffset, int length) {
    if (UNSAFE != null && ADDRESS_FIELD != null && dstBuffer.isDirect()) {
        try {
            long dstAddress = (long)ADDRESS_FIELD.get(dstBuffer) + dstPosition;
            UNSAFE.copyMemory(
                src, UNSAFE.arrayBaseOffset(byte[].class) + srcOffset,
                null, dstAddress,
                length);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    } else {
        // fallback to System.arraycopy
        System.arraycopy(
            src, srcOffset,
            dstBuffer.array(), dstBuffer.arrayOffset() + dstPosition,
            length);
    }
}
Can ALL string be decoded as valid binary data?

Can ALL string be decoded as valid binary data?


By : surinder sokhal
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further It depends upon your coding method - some methods use only a limited range of characters so a string containing other characters would not be legal. In Base64 this is the case so the answer is no. With other methods I'm sure its possible but I cannot think of an example other than simply treating the string as binary bytes.
In Javascript, how do I decode a string in which decoded string contains binary (e.g. non UTF-8) data?

In Javascript, how do I decode a string in which decoded string contains binary (e.g. non UTF-8) data?


By : NoSuperstition
Date : March 29 2020, 07:55 AM
I wish this helpful for you Last edit: More publicity should made of this sentence from the 2015 related SO answer
code :
var byteArray = base64js.toByteArray(myBase64Str)
var fs = require('fs')
var base64js =  require('base64-js')
fs.readFile('pathToMyBase64File', 'utf8', (err, data) => { // here 'utf8' is mandatory
  if (err) throw err;
  var byteArray = base64js.toByteArray(data)
  console.log(base64js.byteLength(data) == byteArray.length)
})
Python - decoded unicode string does not stay decoded

Python - decoded unicode string does not stay decoded


By : user2281336
Date : March 29 2020, 07:55 AM
help you fix your problem Decoding bytes by definition produces "Unicode" (text really, where Unicode is how you can store arbitrary text, so Python uses it internally for all text), so when you say "How can the list contain unicode characters if it has already been decoded?" it betrays a fundamental misunderstanding of what Unicode is. If you have a str in Python 3, it's text, and that text is composed of a series of Unicode code points (with unspecified internal encoding; in fact, modern Python stores in ASCII, latin-1, UCS-2 or UCS-4, depending on highest ordinal value, as well as sometimes caching a UTF-8 representation, or a native wchar representation for use with legacy extension modules).
You're seeing the repr of the nul character (Unicode ordinal 0) and thinking it didn't decode properly, and you're likely right (there's nothing illegal about nul characters, they're just not common in plain text); your input data is almost certainly encoded in UTF-16-LE, not UTF-8. Use the correct codec, and the text comes out correctly:
code :
>>> bs = bytearray(b'I\x00n\x00t\x00e\x00l\x00(\x00R\x00)\x00')
>>> bs.decode('utf-16-le')  # No need to replace things, this is legit UTF-16-LE
'Intel(R)'
>>> list_of_dict = [{'name': _}]
>>> list_of_dict
[{'name': 'Intel(R)'}]
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