Package com.kitfox.svg.xml.cpx

Class CPXInputStream

  • All Implemented Interfaces:
    CPXConsts, java.io.Closeable, java.lang.AutoCloseable
    public class CPXInputStream
extends java.io.FilterInputStream
implements CPXConsts
    This class reads/decodes the CPX file format. This format is a simple compression/encryption transformer for XML data. This stream takes in encrypted XML and outputs decrypted. It does this by checking for a magic number at the start of the stream. If absent, it treats the stream as raw XML data and passes it through unaltered. This is to aid development in debugging versions, where the XML files will not be in CPX format. See http://java.sun.com/developer/technicalArticles/Security/Crypto/

    • Field Summary

      Fields 
      Modifier and Type Field Description
      (package private) byte[] decryptBuffer  
      (package private) byte[] head  
      (package private) int headPtr  
      (package private) int headSize  
      (package private) byte[] inBuffer  
      (package private) java.util.zip.Inflater inflater  
      (package private) boolean reachedEOF  
      (package private) java.security.SecureRandom sec  
      (package private) int xlateMode  

      • Fields inherited from class java.io.FilterInputStream

        in

    • Constructor Summary

      Constructors 
      Constructor Description
      CPXInputStream​(java.io.InputStream in)
      Creates a new instance of CPXInputStream

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int available()
      This method returns 1 if we've not reached EOF, 0 if we have.
      void close()
      Closes this input stream and releases any system resources associated with the stream.
      protected boolean decryptChunk()
      Call when inflater indicates that it needs more bytes.
      boolean markSupported()
      We do not allow marking
      int read()
      Reads the next byte of data from this input stream.
      int read​(byte[] b)
      Reads up to byte.length bytes of data from this input stream into an array of bytes.
      int read​(byte[] b, int off, int len)
      Reads up to len bytes of data from this input stream into an array of bytes.
      long skip​(long n)
      Skips bytes by reading them into a cached buffer

      • Methods inherited from class java.io.FilterInputStream

        mark, reset

      • Methods inherited from class java.io.InputStream

        nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • sec

        java.security.SecureRandom sec

      • inflater

        java.util.zip.Inflater inflater

      • xlateMode

        int xlateMode

      • head

        byte[] head

      • headSize

        int headSize

      • headPtr

        int headPtr

      • reachedEOF

        boolean reachedEOF

      • inBuffer

        byte[] inBuffer

      • decryptBuffer

        byte[] decryptBuffer

    • Constructor Detail

      • CPXInputStream

        public CPXInputStream​(java.io.InputStream in)
               throws java.io.IOException
        Creates a new instance of CPXInputStream
        Parameters:
        in -
        Throws:
        java.io.IOException

    • Method Detail

      • markSupported

        public boolean markSupported()
        We do not allow marking
        Overrides:
        markSupported in class java.io.FilterInputStream

      • close

        public void close()
           throws java.io.IOException
        Closes this input stream and releases any system resources associated with the stream. This method simply performs in.close().
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Overrides:
        close in class java.io.FilterInputStream
        Throws:
        java.io.IOException - if an I/O error occurs.
        See Also:
        FilterInputStream.in

      • read

        public int read()
         throws java.io.IOException
        Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

        This method simply performs in.read() and returns the result.

        Overrides:
        read in class java.io.FilterInputStream
        Returns:
        the next byte of data, or -1 if the end of the stream is reached.
        Throws:
        java.io.IOException - if an I/O error occurs.
        See Also:
        FilterInputStream.in

      • read

        public int read​(byte[] b)
         throws java.io.IOException
        Reads up to byte.length bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

        This method simply performs the call read(b, 0, b.length) and returns the result. It is important that it does not do in.read(b) instead; certain subclasses of FilterInputStream depend on the implementation strategy actually used.

        Overrides:
        read in class java.io.FilterInputStream
        Parameters:
        b - the buffer into which the data is read.
        Returns:
        the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
        Throws:
        java.io.IOException - if an I/O error occurs.
        See Also:
        FilterInputStream.read(byte[], int, int)

      • read

        public int read​(byte[] b,
                int off,
                int len)
         throws java.io.IOException
        Reads up to len bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

        This method simply performs in.read(b, off, len) and returns the result.

        Overrides:
        read in class java.io.FilterInputStream
        Parameters:
        b - the buffer into which the data is read.
        off - the start offset of the data.
        len - the maximum number of bytes read.
        Returns:
        the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
        Throws:
        java.io.IOException - if an I/O error occurs.
        See Also:
        FilterInputStream.in

      • decryptChunk

        protected boolean decryptChunk()
                        throws java.io.IOException
        Call when inflater indicates that it needs more bytes.
        Returns:
        - true if we decrypted more bytes to deflate, false if we encountered the end of stream
        Throws:
        java.io.IOException

      • available

        public int available()
        This method returns 1 if we've not reached EOF, 0 if we have. Programs should not rely on this to determine the number of bytes that can be read without blocking.
        Overrides:
        available in class java.io.FilterInputStream

      • skip

        public long skip​(long n)
          throws java.io.IOException
        Skips bytes by reading them into a cached buffer
        Overrides:
        skip in class java.io.FilterInputStream
        Throws:
        java.io.IOException