converting a int array to a byte array

[cryptogirl]

Hello,

I need to convert an int array to a byte array. The int array is
divided into elements of 8 bits long. Any code would help.

Thank you

 

[VisionSet]

Hello,

I need to convert an int array to a byte array. The int array is
divided into elements of 8 bits long. Any code would help.

Thank you

List<Byte> bytes = new ArrayList<Byte>();
int[] array = ...

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

bytes.add((byte)(array >> 24));
bytes.add((byte)(array >> 16));
bytes.add((byte)(array >> 8));
bytes.add((byte)(array >> 0));

}

byte[] barry = bytes.asArray(new byte[bytes.size()]);

there's probably a quicker way

 

[uhon]

Hi here the method I use to convert an int to ByteArray. I assume that
it suit with your needs.

Attention int is 4 Bytes long, if you want to produce longer byteArrays
with leading zeros, ajust the length variable.

private byte[] makeByteArray(int value, int length) {
byte[] b = new byte[length];

for (int i = 0; i < length; i++) {
int offset = (b.length - 1 - i) * 8;
b = (byte) ((value >>> offset) & 0xFF);
}
if(b.length > 4) {
for(int i = 0; i < b.length - 4; i++) {
b = 0;
}
}
return b;
}

Hello,

I need to convert an int array to a byte array. The int array is
divided into elements of 8 bits long. Any code would help.

Thank you

List<Byte> bytes = new ArrayList<Byte>();
int[] array = ...

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

bytes.add((byte)(array >> 24));
bytes.add((byte)(array >> 16));
bytes.add((byte)(array >> 8));
bytes.add((byte)(array >> 0));

}

byte[] barry = bytes.asArray(new byte[bytes.size()]);

there's probably a quicker way

 

[Roedy Green]

I need to convert an int array to a byte array. The int array is
divided into elements of 8 bits long. Any code would help.

e
you do it element by element to a new array the same size. So your
problem reduces to converting an int to a byte. See
http://mindprod.com/applets/converter.html

 

[Chris Uppal]

List<Byte> bytes = new ArrayList<Byte>();

Probably not a good idea to use an ArrayList<Byte> -- very wasteful of time and
space.

(Unless you know that you aren't doing it often, or with many bytes-worth of
input.)

-- chris

 

[cryptogirl]

Okay my array length will be any were between 1-1500 bytes. so where
ever there is a 4 i change it to 1500?