Mega Code Archive
Reads at most certain bytes from input stream and returns them as a byte array
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/*
* Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2006.
*
* Licensed under the Aduna BSD-style license.
*/
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class Main {
/**
* Reads at most <tt>maxBytes</tt> bytes from the supplied input stream and
* returns them as a byte array.
*
* @param in The InputStream supplying the bytes.
* @param maxBytes The maximum number of bytes to read from the input
* stream.
* @return A byte array of size <tt>maxBytes</tt> if the input stream can
* produce that amount of bytes, or a smaller byte containing all available
* bytes from the stream otherwise.
*/
public static final byte[] readBytes(InputStream in, int maxBytes)
throws IOException
{
byte[] result = new byte[maxBytes];
int bytesRead = in.read(result);
int totalBytesRead = bytesRead;
while (totalBytesRead < maxBytes && bytesRead >= 0) {
// Read more bytes
bytesRead = in.read(result, bytesRead, maxBytes - bytesRead);
if (bytesRead > 0) {
totalBytesRead += bytesRead;
}
}
if (totalBytesRead < 0) {
// InputStream at end-of-file
result = new byte[0];
}
else if (totalBytesRead < maxBytes) {
// Create smaller byte array
byte[] tmp = new byte[totalBytesRead];
System.arraycopy(result, 0, tmp, 0, totalBytesRead);
result = tmp;
}
return result;
}
}
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