public static void readFile(String filenameIn, int bufferSize) throws IOException {
long lenIn = new File(filenameIn).length();
if (debug) System.out.println("read " + filenameIn + " len = " + lenIn);
InputStream in = new FileInputStream(filenameIn);
long total = 0;
long start = System.currentTimeMillis();
byte[] buffer = new byte[bufferSize];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1) break;
total += buffer[0];
}
double took = .001 * (System.currentTimeMillis() - start);
in.close();
double rate = lenIn / took / (1000 * 1000);
System.out.println(
" copy ("
+ bufferSize
+ ") took = "
+ took
+ " sec; rate = "
+ rate
+ "Mb/sec total="
+ total);
}
public static long checksumBufferedInputStream(Path filename) throws IOException {
try (InputStream in = new BufferedInputStream(Files.newInputStream(filename))) {
CRC32 crc = new CRC32();
int c;
while ((c = in.read()) != -1) crc.update(c);
return crc.getValue();
}
}
public static int pipe_stream(InputStream is, OutputStream os, boolean wantsKeepOpen)
throws IOException { // U: copia de un stream al otro
int cnt = 0;
int n;
byte[] buffer = new byte[BUFF_SZ];
while ((n = is.read(buffer)) > -1) {
cnt += n;
os.write(buffer, 0, n);
}
if (!wantsKeepOpen) {
is.close();
os.close();
}
return cnt;
}
public static String get_stream(InputStream is, String encoding) throws IOException {
if (encoding == null) {
encoding = CfgEncodingDflt;
}
byte[] buffer = new byte[BUFF_SZ];
StringBuilder out = new StringBuilder();
logm("DBG", 9, "STREAM GET", is + "");
for (; ; ) {
int rsz = is.read(buffer, 0, buffer.length);
logm("DBG", 9, "STREAM GET READ", rsz);
if (rsz < 0) break;
out.append(new String(buffer, 0, rsz, encoding));
}
String s = out.toString();
logm("DBG", 9, "STREAM GET RESULT", s);
return s;
}
/**
* Determines from the magic number whether the given InputStream points to a DDS image. The given
* InputStream must return true from markSupported() and support a minimum of four bytes of
* read-ahead.
*
* @param in Stream to check
* @return true if input stream is DDS image or false otherwise
* @throws java.io.IOException if an I/O exception occurred
*/
public static boolean isDDSImage(InputStream in) throws IOException {
if (!(in instanceof BufferedInputStream)) {
in = new BufferedInputStream(in);
}
if (!in.markSupported()) {
throw new IOException(
"Can not test non-destructively whether given InputStream is a DDS image");
}
in.mark(4);
int magic = 0;
for (int i = 0; i < 4; i++) {
int tmp = in.read();
if (tmp < 0) {
in.reset();
return false;
}
magic = ((magic >>> 8) | (tmp << 24));
}
in.reset();
return (magic == MAGIC);
}
