Thread: reading LSB of binarydata

By LSB I assume you mean the Least Significant Byte of an int value.
To get that byte, AND the int value with 0xFF.

i am able to change the content of text file to binary

I'm not sure what that means. A file is made up of bytes. A byte is made of 8 binary bits. There is not conversion needed when reading the bytes of a file. Can you explain and give an example.
For example if the file contained these two bytes (in hex) 9591
or in binary(1001 0101 1001 0001)
what would the "changed" bytes look like?

Please define what LSB means and give an example.

byte[] b=filename.getBytes() to covert a text file into bytes

Is filename a String? What does it contain? How is that related to the contents of a text file?
Are the lineend characters from the file included in the bytes that are obtained?

i need to hide text into image file so for that purpose i have read a text file and converted into binary now how do i select LSB from that data and embedd into another LSB of image

Define what you mean by LSB of data.

Can you give an example?

hide LSB of text data

What are you going to do with the other 7 bits? I assume the LSB is of a byte.

If you read a file, byte by byte, and only save the LSB of each byte, then you would never be able to restore the full 8 bits of the byte having only saved the LSB.

To hide the whole text take the bits of each byte of the text and save them in the LSB of each byte in the image. First bit of first byte of text in LSB of first byte of image, second bit in second byte, third bit in third byte etc

Here's a suggestion: Work with ByteArray streams for easier debugging.
Write a method that takes two input streams and one output stream. Read the bits from one input stream, add its bits to the LSB of the other stream and write to the output stream.
Then another method that takes an input stream (with the hidden text) and an output stream that gets the LSBs of the input stream, makes bytes and writes the bytes to the output stream.

howto save them in lsb of image?

Use the OR operator to set a bit in an int: 0b100 OR 0b001 gives 0b101
Use the AND operator to clear a bit:
0b011(input) AND 0b110 (the filter) gives 0b010 clearing the LSB

NOTE: I'm using 0b to denote binary