/**
* Compares the contents of two streams by reading them.
*
* <p>NOTE: The streams get closed in any case.
*
* @param contents1 the first content stream
* @param contents2 the second content stream
* @return true iff both stream had the same length and the same data
* @throws IOException if an I/O exception occurs while reading one of the streams
*/
public static boolean hasSameContents(InputStream contents1, InputStream contents2)
throws IOException {
try {
int bufSize = 10000;
byte[] buffer1 = new byte[bufSize];
byte[] buffer2 = new byte[bufSize];
boolean eof1 = false;
boolean eof2 = false;
while (!eof1 && !eof2) {
int pos1 = 0;
while (pos1 != bufSize) {
int count = contents1.read(buffer1, pos1, bufSize - pos1);
if (count == -1) {
eof1 = true;
break;
}
pos1 += count;
}
int pos2 = 0;
while (pos2 != bufSize) {
int count = contents2.read(buffer2, pos2, bufSize - pos2);
if (count == -1) {
eof2 = true;
break;
}
pos2 += count;
}
if (eof1 || eof2) {
if (pos1 != pos2 || !firstBytesEquals(buffer1, buffer2, pos1)) {
return false;
}
} else {
if (!Arrays.equals(buffer1, buffer2)) {
return false;
}
}
}
return true;
} finally {
IOUtil.closeSilently(contents1);
IOUtil.closeSilently(contents2);
}
}
/**
* Copies the data from the given input stream to the given output stream. Closes both streams in
* any case.
*
* @param in stream to read from
* @param out stream to write to
* @throws IOException if any I/O exception occurs during reading or writing
*/
public static final void copyInputStreamToOutputStream(InputStream in, OutputStream out)
throws IOException {
byte[] buffer = new byte[1024 * 4];
try {
int len;
while ((len = in.read(buffer)) >= 0) {
out.write(buffer, 0, len);
}
} finally {
closeSilently(in);
closeSilently(out);
}
}