/**
* Maps blah file with a random offset and checks to see if read from the ByteBuffer gets the
* right line number
*/
private static void testRead() throws Exception {
StringBuilder sb = new StringBuilder();
sb.setLength(4);
for (int x = 0; x < 1000; x++) {
try (FileInputStream fis = new FileInputStream(blah)) {
FileChannel fc = fis.getChannel();
long offset = generator.nextInt(10000);
long expectedResult = offset / CHARS_PER_LINE;
offset = expectedResult * CHARS_PER_LINE;
MappedByteBuffer b = fc.map(MapMode.READ_ONLY, offset, 100);
for (int i = 0; i < 4; i++) {
byte aByte = b.get(i);
sb.setCharAt(i, (char) aByte);
}
int result = Integer.parseInt(sb.toString());
if (result != expectedResult) {
err.println("I expected " + expectedResult);
err.println("I got " + result);
throw new Exception("Read test failed");
}
}
}
}
/**
* Maps blah file with a random offset and checks to see if data written out to the file can be
* read back in
*/
private static void testWrite() throws Exception {
StringBuilder sb = new StringBuilder();
sb.setLength(4);
for (int x = 0; x < 1000; x++) {
try (RandomAccessFile raf = new RandomAccessFile(blah, "rw")) {
FileChannel fc = raf.getChannel();
long offset = generator.nextInt(1000);
MappedByteBuffer b = fc.map(MapMode.READ_WRITE, offset, 100);
for (int i = 0; i < 4; i++) {
b.put(i, (byte) ('0' + i));
}
for (int i = 0; i < 4; i++) {
byte aByte = b.get(i);
sb.setCharAt(i, (char) aByte);
}
if (!sb.toString().equals("0123")) throw new Exception("Write test failed");
}
}
}
private static String byteArrayToHex(byte[] a) {
StringBuilder sb = new StringBuilder(a.length * 2);
for (byte b : a) {
sb.append(String.format("%02x", b & 0xff));
}
return sb.toString();
}