List of usage examples for java.io PushbackInputStream PushbackInputStream
public PushbackInputStream(InputStream in, int size)
PushbackInputStream with a pushback buffer of the specified size, and saves its argument, the input stream in, for later use. From source file:Main.java
public static void main(String args[]) throws IOException { byte buf[] = "== = ".getBytes(); PushbackInputStream f = new PushbackInputStream(new ByteArrayInputStream(buf), 100); int c;/* ww w . j av a 2 s . com*/ while ((c = f.read()) != -1) { switch (c) { case '=': c = f.read(); if (c == '=') System.out.print(".eq."); else { System.out.print("="); f.unread(c); } break; default: System.out.print((char) c); break; } } }
From source file:Main.java
public static void main(String[] args) { byte[] arrByte = new byte[1024]; byte[] byteArray = new byte[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' }; InputStream is = new ByteArrayInputStream(byteArray); PushbackInputStream pis = new PushbackInputStream(is, 10); try {/* ww w . j a v a 2s . c o m*/ for (int i = 0; i < byteArray.length; i++) { arrByte[i] = (byte) pis.read(); System.out.println((char) arrByte[i]); } byte[] b = { 'W', 'o', 'r', 'l', 'd' }; pis.unread(b); for (int i = 0; i < byteArray.length; i++) { arrByte[i] = (byte) pis.read(); System.out.println((char) arrByte[i]); } } catch (Exception ex) { ex.printStackTrace(); } }
From source file:Main.java
public static void main(String[] args) { byte[] arrByte = new byte[1024]; byte[] byteArray = new byte[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' }; InputStream is = new ByteArrayInputStream(byteArray); PushbackInputStream pis = new PushbackInputStream(is, 10); try {/*from w ww .ja va 2 s.c o m*/ for (int i = 0; i < byteArray.length; i++) { arrByte[i] = (byte) pis.read(); System.out.println((char) arrByte[i]); } byte[] b = { 'W', 'o', 'r', 'l', 'd' }; pis.unread(b, 2, 3); for (int i = 0; i < 3; i++) { arrByte[i] = (byte) pis.read(); System.out.println((char) arrByte[i]); } } catch (Exception ex) { ex.printStackTrace(); } }
From source file:Main.java
public static void main(String[] args) { byte[] arrByte = new byte[1024]; byte[] byteArray = new byte[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' }; InputStream is = new ByteArrayInputStream(byteArray); PushbackInputStream pis = new PushbackInputStream(is, 10); try {/* www . ja v a 2s .co m*/ // read from the buffer one character at a time for (int i = 0; i < byteArray.length; i++) { // read a char into our array arrByte[i] = (byte) pis.read(); System.out.println((char) arrByte[i]); } // unread a char pis.unread('F'); // read again from the buffer arrByte[1] = (byte) pis.read(); System.out.println((char) arrByte[1]); } catch (Exception ex) { ex.printStackTrace(); } }
From source file:Main.java
public static BufferedReader readMap(InputStream in) throws IOException { PushbackInputStream pushback = new PushbackInputStream(in, 3); int first = pushback.read(); if (first == 0xEF) { int second = pushback.read(); if (second == 0xBB) { int third = pushback.read(); if (third == 0xBF) { return new BufferedReader(new InputStreamReader(pushback, "UTF-8")); }/*from w ww. ja v a 2 s . c om*/ pushback.unread(third); } pushback.unread(second); } pushback.unread(first); return new BufferedReader(new InputStreamReader(pushback, "ISO-8859-1")); }
From source file:Main.java
/** * Convenience method to get a PushbackInputStream so that we can read the BOM * * @param is a regular InputStream/*from ww w.j av a 2s .co m*/ * @return a PushbackInputStream wrapping the passed one */ public static PushbackInputStream getPushbackInputStream(InputStream is) { return new PushbackInputStream(is, BOM_SIZE); }
From source file:Main.java
/** * Creates a reader allowing to read the contents of specified text source. * <p>This method implements the detection of the encoding. * <p>Note that the detection of the encoding always works * because it uses a fallback value./*ww w . j a v a 2s . com*/ * * @param in the text source * @param encoding the detected encoding is copied there. * May be <code>null</code>. * @return a reader allowing to read the contents of the text source. * This reader will automatically skip the BOM if any. * @exception IOException if there is an I/O problem */ public static Reader createReader(InputStream in, String fallbackEncoding, String[] encoding) throws IOException { byte[] bytes = new byte[1024]; int byteCount = -1; PushbackInputStream in2 = new PushbackInputStream(in, bytes.length); try { int count = in2.read(bytes, 0, bytes.length); if (count > 0) { in2.unread(bytes, 0, count); } byteCount = count; } catch (IOException ignored) { } String charset = null; if (byteCount > 0) { if (byteCount >= 2) { // Use BOM --- int b0 = (bytes[0] & 0xFF); int b1 = (bytes[1] & 0xFF); switch ((b0 << 8) | b1) { case 0xFEFF: charset = "UTF-16BE"; // We don't want to read the BOM. in2.skip(2); break; case 0xFFFE: charset = "UTF-16LE"; in2.skip(2); break; case 0xEFBB: if (byteCount >= 3 && (bytes[2] & 0xFF) == 0xBF) { charset = "UTF-8"; in2.skip(3); } break; } } if (charset == null) { // Unsupported characters are replaced by U+FFFD. String text = new String(bytes, 0, byteCount, "US-ASCII"); if (text.startsWith("<?xml")) { Pattern pattern = Pattern.compile("encoding\\s*=\\s*['\"]([^'\"]+)"); Matcher matcher = pattern.matcher(text); if (matcher.find()) { charset = matcher.group(1); } else { charset = "UTF-8"; } } } } if (charset == null) { charset = fallbackEncoding; if (charset == null) { charset = "UTF-8"; } } if (encoding != null) { encoding[0] = charset; } return new InputStreamReader(in2, charset); }
From source file:org.apache.pulsar.io.file.utils.GZipFiles.java
/** * Returns true if the given file is a gzip file. *//*from www .j a v a 2 s. c o m*/ @SuppressWarnings("deprecation") public static boolean isGzip(File f) { InputStream input = null; try { input = new FileInputStream(f); PushbackInputStream pb = new PushbackInputStream(input, 2); byte[] signature = new byte[2]; int len = pb.read(signature); //read the signature pb.unread(signature, 0, len); //push back the signature to the stream // check if matches standard gzip magic number return (signature[0] == (byte) 0x1f && signature[1] == (byte) 0x8b); } catch (final Exception e) { return false; } finally { IOUtils.closeQuietly(input); } }
From source file:org.jcodec.codecs.mjpeg.JpegParser.java
public CodedImage parse(InputStream is) throws IOException { CountingInputStream counter = new CountingInputStream(is); return parse(new PushbackInputStream(counter, 2), counter); }
From source file:org.jcodec.codecs.mjpeg.MJPEGParser.java
@Test @Ignore/*from w w w . j av a 2 s .c o m*/ public void testPerformance() throws Exception { JpegDecoder dec = new JpegDecoder(); JpegParser parser = new JpegParser(); InputStream is = new BufferedInputStream(new FileInputStream("/Users/zhukov/Movies/MVI_0636.mjpg")); CountingInputStream counter = new CountingInputStream(is); PushbackInputStream push = new PushbackInputStream(counter, 2); CodedImage codedImage = parser.parse(is); DecodedImage decode = new DecodedImage(codedImage.getWidth(), codedImage.getHeight()); dec.decode(codedImage, decode); long start = System.currentTimeMillis(); for (int i = 1; i < 2; i++) { if (i % 10 == 0) { long time = System.currentTimeMillis() - start; long fps = i * 1000 / time; System.out.println(i + " " + fps + "fps"); } codedImage = parser.parse(push, counter); dec.decode(codedImage, decode); } }