public void write(FileOutputStream fos) throws IOException {
FileChannel chan = fos.getChannel();
// Create ByteBuffer for header in case the start of our
// ByteBuffer isn't actually memory-mapped
ByteBuffer hdr = ByteBuffer.allocate(Header.writtenSize());
hdr.order(ByteOrder.LITTLE_ENDIAN);
header.write(hdr);
hdr.rewind();
chan.write(hdr);
buf.position(Header.writtenSize());
chan.write(buf);
chan.force(true);
chan.close();
}
public static void main(String[] argv) {
if (argv.length != 3) {
usage();
}
String tempFile = argv[0];
String testFile = argv[1];
int fileSize = Integer.valueOf(argv[2]).intValue();
int exitcode = 0;
int numRead;
int numThisBuf;
int numWritten;
if ((fileSize <= 0) || (fileSize % 4096 != 0)) {
System.out.println("Error: size is not a multiple of 4096!!!!!!");
System.out.println();
usage();
}
try {
int bufSize = 4096;
byte[] inBytes = new byte[bufSize];
byte[] outBytes = new byte[bufSize];
Random ioRandom = new Random(2006);
ioRandom.nextBytes(outBytes);
ByteBuffer inBuf = ByteBuffer.allocate(bufSize);
ByteBuffer outBuf = ByteBuffer.wrap(outBytes);
//
// Loop forever
//
while (true) {
//
// Write the temporary file
//
FileOutputStream fos = new FileOutputStream(tempFile);
FileChannel foc = fos.getChannel();
numWritten = 0;
while (numWritten < fileSize) {
outBuf.clear(); // sets limit to capacity & position to zero
while (outBuf.hasRemaining()) {
numWritten += foc.write(outBuf);
}
}
//
// Move to permanent location
//
FileChannel srcChannel = new FileInputStream(tempFile).getChannel();
FileChannel dstChannel = new FileOutputStream(testFile).getChannel();
dstChannel.transferFrom(srcChannel, 0, srcChannel.size());
srcChannel.close();
dstChannel.close();
boolean success = (new File(tempFile)).delete();
if (!success) {
System.out.println("Warning: unable to delete temporary file");
}
//
// Read and compare
//
FileInputStream fis = new FileInputStream(testFile);
FileChannel fic = fis.getChannel();
for (numRead = 0, numThisBuf = 0; numRead < fileSize; numThisBuf = 0) {
inBuf.rewind(); // Set the buffer position to 0
numThisBuf = fic.read(inBuf);
while (numThisBuf < bufSize) {
numThisBuf += fic.read(inBuf);
}
numRead += bufSize;
inBuf.rewind(); // Set the buffer position to 0
inBuf.get(inBytes);
boolean same = Arrays.equals(inBytes, outBytes);
if (same = false) {
System.out.println("Data read does not equal data written at " + numRead + " bytes");
}
}
}
} catch (FileNotFoundException fnfe) {
fnfe.printStackTrace(System.err);
exitcode = 1;
// break;
} catch (SecurityException se) {
se.printStackTrace(System.err);
exitcode = 1;
// break;
} catch (Throwable t) {
t.printStackTrace(System.err);
exitcode = 1;
}
System.exit(exitcode);
}