Java Utililty Methods GZip InputStream Check

List of utility methods to do GZip InputStream Check

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Description

The list of methods to do GZip InputStream Check are organized into topic(s).

Method

booleanisGZip(BufferedInputStream instream)
Test for GZIP stream signature. 
instream.mark(2);
byte[] b = new byte[2];
try {
    instream.read(b, 0, 2);
} catch (Exception ex) {
    throw new RuntimeException("Couldn't read header from stream ", ex);
try {
...
booleanisGZIPCompressed(InputStream in)
Indicates whether an InputStream is GZIP compressed. 
if (!in.markSupported()) {
    throw new IllegalArgumentException("InputStream must support mark()!");
byte[] data = new byte[2];
in.mark(2);
in.read(data);
in.reset();
return ((data[0] == GZIP_MAGIC[0]) && (data[1] == GZIP_MAGIC[1]));
...
booleanisGZipped(InputStream in)
Checks if an input stream is gzipped. 
int magic = 0;
try {
    if (!in.markSupported()) {
        in = new BufferedInputStream(in);
    in.mark(2);
    try {
        magic = in.read() & 0xff | ((in.read() << 8) & 0xff00);
...
booleanisGZipped(InputStream in)
is G Zipped 
if (!in.markSupported()) {
    in = new BufferedInputStream(in);
in.mark(2);
int magic = 0;
try {
    magic = in.read() & 0xff | ((in.read() << 8) & 0xff00);
    in.reset();
...
booleanisGzipStm(InputStream in)
is Gzip Stm 
boolean ms = in.markSupported();
if (ms)
    in.mark(10);
int b1 = in.read();
int b2 = in.read();
if (ms)
    in.reset();
return ((b2 << 8 | b1) == GZIPInputStream.GZIP_MAGIC);
...