package com.ack.security;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class ByteUtils {
private static final int DEFAULT_CHUNK_SIZE = 1024;
/**
* save bytes to file
* @param fileName the file to write the supplied bytes
* @param theBytes the bytes to write to file
* @throws java.io.IOException reports problems saving bytes to file
*/
public static void saveBytesToFile( String fileName, byte[] theBytes )
throws java.io.IOException {
saveBytesToStream( new java.io.FileOutputStream( fileName ), theBytes );
}
/**
* save bytes to output stream and close the output stream on success and
* on failure.
* @param out the output stream to write the supplied bytes
* @param theBytes the bytes to write out
* @throws java.io.IOException reports problems saving bytes to output stream
*/
public static void saveBytesToStream( java.io.OutputStream out, byte[] theBytes )
throws java.io.IOException {
try {
out.write( theBytes );
}
finally {
out.flush();
out.close();
}
}
/**
* Loads bytes from the file
*
* @param fileName file to read the bytes from
* @return bytes read from the file
* @exception java.io.IOException reports IO failures
*/
public static byte[] loadBytesFromFile( String fileName ) throws java.io.IOException {
return loadBytesFromStream( new java.io.FileInputStream( fileName ), DEFAULT_CHUNK_SIZE );
}
/**
* Loads bytes from the given input stream until the end of stream
* is reached. It reads in at kDEFAULT_CHUNK_SIZE chunks.
*
* @param stream to read the bytes from
* @return bytes read from the stream
* @exception java.io.IOException reports IO failures
*/
public static byte[] loadBytesFromStream( java.io.InputStream in ) throws java.io.IOException {
return loadBytesFromStream( in, DEFAULT_CHUNK_SIZE );
}
/**
* Loads bytes from the given input stream until the end of stream
* is reached. Bytes are read in at the supplied chunkSize
* rate.
*
* @param stream to read the bytes from
* @return bytes read from the stream
* @exception java.io.IOException reports IO failures
*/
public static byte[] loadBytesFromStream( java.io.InputStream in, int chunkSize )
throws java.io.IOException {
if( chunkSize < 1 )
chunkSize = DEFAULT_CHUNK_SIZE;
int count;
java.io.ByteArrayOutputStream bo = new java.io.ByteArrayOutputStream();
byte[] b = new byte[chunkSize];
try {
while( ( count = in.read( b, 0, chunkSize ) ) > 0 ) {
bo.write( b, 0, count );
}
byte[] thebytes = bo.toByteArray();
return thebytes;
}
finally {
bo.close();
}
}
}