how to split byte[] to smaller chunks

[Daniel Bauer]

hi i have a big file.i have loaded this file to byte[].

now i want to split this byte[] to smaller byte[] chunks of byte[500].

how to do this ?

[Ernest Friedman-Hill]

There's no way except for the direct way -- in a "for" loop, allocate 500-byte arrays, and use System.arraycopy() to copy data from the big array into them.

[Daniel Bauer]

public static void splitBytes(byte[] fileBytes) throws Exception {


int offset = 0;
int fileCounter = 0;

while (offset < fileBytes.length) {
byte[] outputBytes;

if(fileBytes.length - offset < 500 ) {
outputBytes = new byte[fileBytes.length - offset];
System.arraycopy(fileBytes, offset, outputBytes, 0, fileBytes.length - offset);
saveFile(outputBytes , fileCounter++);
break;
}

outputBytes = new byte[500];
System.arraycopy(fileBytes, offset, outputBytes, 0, 500);
offset +=500 ;
saveFile(outputBytes , fileCounter++);
Thread.sleep(3000);

}

}

[Daniel Bauer]

or with a recursion

public static void splitBytes(byte[] fileBytes, int offset , int fileCounter) throws Exception {

byte[] outputBytes;

if(fileBytes.length - offset < 500 ) {
outputBytes = new byte[fileBytes.length - offset];
System.arraycopy(fileBytes, offset, outputBytes, 0, fileBytes.length - offset);
saveFile(outputBytes , fileCounter++);
return;
}

outputBytes = new byte[500];
System.arraycopy(fileBytes, offset, outputBytes, 0, 500);
saveFile(outputBytes , fileCounter++);
Thread.sleep(3000);
splitBytes(fileBytes,offset+500, fileCounter++);


}