{

//check that the data + offset will fit in the image

if(addition.length + offset > image.length)

{

throw new IllegalArgumentException("File not long enough!");

}

//loop through each addition byte

for(int i=0; i<addition.length; ++i)

{

//loop through the 8 bits of each byte

int add = addition[i];

for(int bit=7; bit>=0; --bit, ++offset) //ensure the new offset value carries on through both loops

{

//assign an integer to b, shifted by bit spaces AND 1

//a single bit of the current byte

int b = (add >>> bit) & 1;

//assign the bit by taking: [(previous byte value) AND 0xfe] OR bit to add

//changes the last bit of the byte in the image to be the bit of addition

image[offset] = (byte)((image[offset] & 0xFE) | b );

}

}

return image;

{

int length = 0;

int offset = 32;

//loop through 32 bytes of data to determine text length

for(int i=0; i<32; ++i) //i=24 will also work, as only the 4th byte contains real data

{

length = (length << 1) | (image[i] & 1);

}

byte[] result = new byte[length];

//loop through each byte of text

for(int b=0; b<result.length; ++b )

{

//loop through each bit within a byte of text

for(int i=0; i<8; ++i, ++offset)

{

//assign bit: [(new byte value) << 1] OR [(text byte) AND 1]

result[b] = (byte)((result[b] << 1) | (image[offset] & 1));

}

}

return result;