Examples of java.io.BufferedInputStream.available()

java.io.BufferedInputStream.available()
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.
This method returns the sum of the number of bytes remaining to be read in the buffer (count - pos) and the result of calling the {@link java.io.FilterInputStream#in in}.available(). @return an estimate of the number of bytes that can be read (or skippedover) from this input stream without blocking. @exception IOException if this input stream has been closed byinvoking its {@link #close()} method,or an I/O error occurs.

                final String imageName = i.next();
                final ZipEntry zipEntry = zipFile.getEntry(imageName);


                final BufferedInputStream bufferedInputStream =
                        new BufferedInputStream(zipFile.getInputStream(zipEntry));
                final byte[] captchaCharData = new byte[bufferedInputStream.
                        available()];
                bufferedInputStream.read(captchaCharData);
                bufferedInputStream.close();


                final Image captchaChar =

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                FileInputStream crlStream = new FileInputStream(crlFile);
                BufferedInputStream crlBuffer = new BufferedInputStream(crlStream);
                
                crls.clear(); //remove existing CRLs
                while (crlBuffer.available() > 0) {
                    crl = (X509CRL)cf.generateCRL(crlBuffer);
                    Log.debug("ClientTrustManager: adding CRL for "+crl.getIssuerDN());
                    crls.add(crl);
                }
                useCRLs = true;

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    private void readTextFile( String fileName ) {
        try {
            String fileText, textLines[];
            BufferedInputStream bis =
              new BufferedInputStream( new FileInputStream( fileName ));
            int numBytes = bis.available();
            if (numBytes == 0) {
                throw new Exception("Text file " + fileName + " is empty");
            }
            byte byteData[] = new byte[ numBytes ];
            bis.read( byteData, 0, numBytes );

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    /// Loads saved options and applies them
    private void loadOptions( String fileName ) {
        try {
            BufferedInputStream bis =
              new BufferedInputStream( new FileInputStream( fileName ));
            int numBytes = bis.available();
            byte byteData[] = new byte[ numBytes ];
            bis.read( byteData, 0, numBytes );
            bis.close();
            if ( numBytes < 2 || 
    (byteData[0] != (byte) 0xFE || byteData[1] != (byte) 0xFF) )

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        }
        // put file into buffer
        bis = new BufferedInputStream(fis);
        bos = new BufferedOutputStream(fos);
        try { // read file, write and close
            b = new byte[bis.available()];
            bis.read(b);
            bos.write(b);
            bis.close();
            bos.close();
            file_copied = true;

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                // stop reading, so we cannot block
                // TODO propery implement support for chunked transfer, i.e. to
                // know when we have read the whole request, and therefore allow
                // the reading to block
                log.debug("Chunked");
                while(in.available() > 0 && ((length = in.read(buffer)) != -1)) {
                    out.write(buffer, 0, length);
                }
            }
            else {
                // The reqest has no body, or it has a transfer encoding we do not support.

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            }
            else {
                // The reqest has no body, or it has a transfer encoding we do not support.
                // In either case, we read any data available
                log.debug("Other");
                while(in.available() > 0 && ((length = in.read(buffer)) != -1)) {
                    log.debug("Read bytes: "+length);
                    out.write(buffer, 0, length);
                }
            }
            log.debug("Flush");

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                // stop reading, so we cannot block
                // TODO propery implement support for chunked transfer, i.e. to
                // know when we have read the whole request, and therefore allow
                // the reading to block
                log.debug("Chunked");
                while(in.available() > 0 && ((length = in.read(buffer)) != -1)) {
                    out.write(buffer, 0, length);
                }
            }
            else {
                // The reqest has no body, or it has a transfer encoding we do not support.

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            }
            else {
                // The reqest has no body, or it has a transfer encoding we do not support.
                // In either case, we read any data available
                log.debug("Other");
                while(in.available() > 0 && ((length = in.read(buffer)) != -1)) {
                    log.debug("Read bytes: "+length);
                    out.write(buffer, 0, length);
                }
            }
            log.debug("Flush");

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    }
  }
  public static byte[] readFileImage(String filename)throws IOException{
    BufferedInputStream bufferedInputStream=new BufferedInputStream(
        new FileInputStream(filename));
    int len =bufferedInputStream.available();
    byte[] bytes=new byte[len];
    int r=bufferedInputStream.read(bytes);
    if(len !=r){
      bytes=null;
      throw new IOException("读取文件不正确");

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