Initial import of release 2.2.REL-2.2@923

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@4 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c
author: tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c> 2006-12-01 12:20:24 +0000
committer: tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c> 2006-12-01 12:20:24 +0000
commit: 6025b6016517c6d898d8957d1d7e03ba71431912 (patch)
tree: b15bd6fa5ffe9588a9bca3f2b8a7e358f83b6eba /src/main/java/org/pdfbox/io
parent: d2c77e820ab4aba8235d71275755021347b3ad10 (diff)
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10 files changed, 1657 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/io/ASCII85InputStream.java b/src/main/java/org/pdfbox/io/ASCII85InputStream.java
new file mode 100644
index 0000000..863d64d
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/ASCII85InputStream.java
@@ -0,0 +1,269 @@
+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.FilterInputStream;
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * This class represents an ASCII85 stream.
+ *
+ * @author Ben Litchfield
+ * @version $Revision: 1.5 $
+ */
+public class ASCII85InputStream extends FilterInputStream
+{
+    private int index;
+    private int n;
+    private boolean eof;
+
+    private byte[] ascii;
+    private byte[] b;
+
+    /**
+     * Constructor.
+     *
+     * @param is The input stream to actually read from.
+     */
+    public ASCII85InputStream( InputStream is )
+    {
+        super(is);
+        index = 0;
+        n = 0;
+        eof = false;
+        ascii = new byte[5];
+        b = new byte[4];
+    }
+
+    /**
+     * This will read the next byte from the stream.
+     *
+     * @return The next byte read from the stream.
+     *
+     * @throws IOException If there is an error reading from the wrapped stream.
+     */
+    public final int read() throws IOException
+    {
+        if( index >= n )
+        {
+            if(eof)
+            {
+                return -1;
+            }
+            index = 0;
+            int k;
+            byte z;
+            do
+            {
+                int zz=(byte)in.read();
+                if(zz==-1)
+                {
+                    eof=true;
+                    return -1;
+                }
+                z = (byte)zz;
+            }  while( z=='\n' || z=='\r' || z==' ');
+
+            if (z == '~' || z=='x')
+            {
+                eof=true;
+                ascii=b=null;
+                n = 0;
+                return -1;
+            }
+            else if (z == 'z')
+            {
+                b[0]=b[1]=b[2]=b[3]=0;
+                n = 4;
+            }
+            else
+            {
+                ascii[0]=z; // may be EOF here....
+                for (k=1;k<5;++k)
+                {
+                    do
+                    {
+                        int zz=(byte)in.read();
+                        if(zz==-1)
+                        {
+                            eof=true;
+                            return -1;
+                        }
+                        z=(byte)zz;
+                    } while ( z=='\n' || z=='\r' || z==' ' );
+                    ascii[k]=z;
+                    if (z == '~' || z=='x')
+                    {
+                        break;
+                    }
+                }
+                n = k - 1;
+                if ( n==0 )
+                {
+                    eof = true;
+                    ascii = null;
+                    b = null;
+                    return -1;
+                }
+                if ( k < 5 )
+                {
+                    for (++k; k < 5; ++k )
+                    {
+                        ascii[k] = 0x21;
+                    }
+                    eof=true;
+                }
+                // decode stream
+                long t=0;
+                for ( k=0; k<5; ++k)
+                {
+                    z=(byte)(ascii[k] - 0x21);
+                    if (z < 0 || z > 93)
+                    {
+                        n = 0;
+                        eof = true;
+                        ascii = null;
+                        b = null;
+                        throw new IOException("Invalid data in Ascii85 stream");
+                    }
+                    t = (t * 85L) + z;
+                }
+                for ( k = 3; k>=0; --k)
+                {
+                    b[k] = (byte)(t & 0xFFL);
+                    t>>>=8;
+                }
+            }
+        }
+        return b[index++] & 0xFF;
+    }
+
+    /**
+     * This will read a chunk of data.
+     *
+     * @param data The buffer to write data to.
+     * @param offset The offset into the data stream.
+     * @param len The number of byte to attempt to read.
+     *
+     * @return The number of bytes actually read.
+     *
+     * @throws IOException If there is an error reading data from the underlying stream.
+     */
+    public final int read(byte[] data, int offset, int len) throws IOException
+    {
+        if(eof && index>=n)
+        {
+            return -1;
+        }
+        for(int i=0;i<len;i++)
+        {
+            if(index<n)
+            {
+                data[i+offset]=b[index++];
+            }
+            else
+            {
+                int t = read();
+                if ( t == -1 )
+                {
+                    return i;
+                }
+                data[i+offset]=(byte)t;
+            }
+        }
+        return len;
+    }
+
+    /**
+     * This will close the underlying stream and release any resources.
+     *
+     * @throws IOException If there is an error closing the underlying stream.
+     */
+    public void close() throws IOException
+    {
+        ascii = null;
+        eof = true;
+        b = null;
+        super.close();
+    }
+
+    /**
+     * non supported interface methods.
+     *
+     * @return False always.
+     */
+    public boolean markSupported()
+    {
+        return false;
+    }
+
+    /**
+     * Unsupported.
+     *
+     * @param nValue ignored.
+     *
+     * @return Always zero.
+     */
+    public long skip(long nValue)
+    {
+        return 0;
+    }
+
+    /**
+     * Unsupported.
+     *
+     * @return Always zero.
+     */
+    public int available()
+    {
+        return 0;
+    }
+
+    /**
+     * Unsupported.
+     *
+     * @param readlimit ignored.
+     */
+    public void mark(int readlimit)
+    {
+    }
+
+    /**
+     * Unsupported.
+     *
+     * @throws IOException telling that this is an unsupported action.
+     */
+    public void reset() throws IOException
+    {
+        throw new IOException("Reset is not supported");
+    }
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/ASCII85OutputStream.java b/src/main/java/org/pdfbox/io/ASCII85OutputStream.java
new file mode 100644
index 0000000..a59f2df
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/ASCII85OutputStream.java
@@ -0,0 +1,304 @@
+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * This class represents an ASCII85 output stream.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.6 $
+ */
+public class ASCII85OutputStream extends FilterOutputStream
+{
+
+    private int lineBreak;
+    private int count;
+
+    private byte[] indata;
+    private byte[] outdata;
+
+    /**
+     * Function produces five ASCII printing characters from
+     * four bytes of binary data.
+     */
+    private int maxline;
+    private boolean flushed;
+    private char terminator;
+
+    /**
+     * Constructor.
+     *
+     * @param out The output stream to write to.
+     */
+    public ASCII85OutputStream( OutputStream out )
+    {
+        super( out );
+        lineBreak = 36*2;
+        maxline = 36*2;
+        count=0;
+        indata=new byte[4];
+        outdata=new byte[5];
+        flushed=true;
+        terminator='~';
+    }
+
+    /**
+     * This will set the terminating character.
+     *
+     * @param term The terminating character.
+     */
+    public void setTerminator(char term)
+    {
+        if(term<118 || term>126 || term=='z')
+        {
+            throw new IllegalArgumentException("Terminator must be 118-126 excluding z");
+        }
+        terminator=term;
+    }
+
+    /**
+     * This will get the terminating character.
+     *
+     * @return The terminating character.
+     */
+    public char getTerminator()
+    {
+        return terminator;
+    }
+
+    /**
+     * This will set the line length that will be used.
+     *
+     * @param l The length of the line to use.
+     */
+    public void setLineLength(int l)
+    {
+        if( lineBreak > l )
+        {
+            lineBreak = l;
+        }
+        maxline=l;
+    }
+
+    /**
+     * This will get the length of the line.
+     *
+     * @return The line length attribute.
+     */
+    public int getLineLength()
+    {
+        return maxline;
+    }
+
+    /**
+     * This will transform the next four ascii bytes.
+     */
+    private final void  transformASCII85()
+    {
+        long word;
+        word=( (((indata[0] << 8) | (indata[1] &0xFF)) << 16) |
+        ( (indata[2] & 0xFF) << 8) | (indata[3] & 0xFF)
+        )    & 0xFFFFFFFFL;
+        // System.out.println("word=0x"+Long.toString(word,16)+" "+word);
+
+        if (word == 0 )
+        {
+            outdata[0]=(byte)'z';
+            outdata[1]=0;
+            return;
+        }
+        long x;
+        x=word/(85L*85L*85L*85L);
+        // System.out.println("x0="+x);
+        outdata[0]=(byte)(x+'!');
+        word-=x*85L*85L*85L*85L;
+
+        x=word/(85L*85L*85L);
+        // System.out.println("x1="+x);
+        outdata[1]=(byte)(x+'!');
+        word-=x*85L*85L*85L;
+
+        x=word/(85L*85L);
+        // System.out.println("x2="+x);
+        outdata[2]=(byte)(x+'!');
+        word-=x*85L*85L;
+
+        x=word/85L;
+        // System.out.println("x3="+x);
+        outdata[3]=(byte)(x+'!');
+
+        // word-=x*85L;
+
+        // System.out.println("x4="+(word % 85L));
+        outdata[4]=(byte)((word%85L)+'!');
+    }
+
+    /**
+     * This will write a single byte.
+     *
+     * @param b The byte to write.
+     *
+     * @throws IOException If there is an error writing to the stream.
+     */
+    public final void write(int b) throws IOException
+    {
+        flushed=false;
+        indata[count++]=(byte)b;
+        if(count < 4 )
+        {
+            return;
+        }
+        transformASCII85();
+        for(int i=0;i<5;i++)
+        {
+            if(outdata[i]==0)
+            {
+                break;
+            }
+            out.write(outdata[i]);
+            if(--lineBreak==0)
+            {
+                out.write('\n');
+                lineBreak=maxline;
+            }
+        }
+        count = 0;
+    }
+
+    /**
+     * This will write a chunk of data to the stream.
+     *
+     * @param b The byte buffer to read from.
+     * @param off The offset into the buffer.
+     * @param sz The number of bytes to read from the buffer.
+     *
+     * @throws IOException If there is an error writing to the underlying stream.
+     */
+    public final void write(byte[] b,int off, int sz) throws IOException
+    {
+        for(int i=0;i<sz;i++)
+        {
+            if(count < 3)
+            {
+                indata[count++]=b[off+i];
+            }
+            else
+            {
+                write(b[off+i]);
+            }
+        }
+    }
+
+    /**
+     * This will flush the data to the stream.
+     *
+     * @throws IOException If there is an error writing the data to the stream.
+     */
+    public final void flush() throws IOException
+    {
+        if(flushed)
+        {
+            return;
+        }
+        if(count > 0 )
+        {
+            for( int i=count; i<4; i++ )
+            {
+                indata[i]=0;
+            }
+            transformASCII85();
+            if(outdata[0]=='z')
+            {
+                for(int i=0;i<5;i++) // expand 'z',
+                {
+                    outdata[i]=(byte)'!';
+                }
+            }
+            for(int i=0;i<count+1;i++)
+            {
+                out.write(outdata[i]);
+                if(--lineBreak==0)
+                {
+                    out.write('\n');
+                    lineBreak=maxline;
+                }
+            }
+        }
+        if(--lineBreak==0)
+        {
+            out.write('\n');
+        }
+        out.write(terminator);
+        out.write('\n');
+        count = 0;
+        lineBreak=maxline;
+        flushed=true;
+        super.flush();
+    }
+
+    /**
+     * This will close the stream.
+     *
+     * @throws IOException If there is an error closing the wrapped stream.
+     */
+    public void close() throws IOException
+    {
+        try
+        {
+            super.close();
+        }
+        finally
+        {
+            indata=outdata=null;
+        }
+    }
+
+    /**
+     * This will flush the stream.
+     *
+     * @throws Throwable If there is an error.
+     */
+    protected void finalize() throws Throwable
+    {
+        try
+        {
+            flush();
+        }
+        finally
+        {
+            super.finalize();
+        }
+    }
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/ByteArrayPushBackInputStream.java b/src/main/java/org/pdfbox/io/ByteArrayPushBackInputStream.java
new file mode 100644
index 0000000..e72cbbb
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/ByteArrayPushBackInputStream.java
@@ -0,0 +1,404 @@
+/**
+ * Copyright (c) 2004, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * PushBackInputStream for byte arrays. 
+ * 
+ * The inheritance from PushBackInputStream is only to avoid the
+ * introduction of an interface with all PushBackInputStream
+ * methods. The parent PushBackInputStream is not used in any way and
+ * all methods are overridden. (Thus when adding new methods to PushBackInputStream
+ * override them in this class as well!)
+ * unread() is limited to the number of bytes already read from this stream (i.e.
+ * the current position in the array). This limitation usually poses no problem 
+ * to a parser, but allows for some optimization since only one array has to
+ * be dealt with.
+ * 
+ * Note: This class is not thread safe. Clients must provide synchronization
+ * if needed.
+ * 
+ * Note: Calling unread() after mark() will cause (part of) the unread data to be 
+ * read again after reset(). Thus do not call unread() between mark() and reset().
+ * 
+ * @author Andreas Weiss (andreas.weiss@switzerland.org)
+ * @version $Revision: 1.2 $
+ */
+public class ByteArrayPushBackInputStream extends PushBackInputStream
+{
+    private byte[] data;
+    private int datapos;
+    private int datalen;
+    private int save;
+    
+    // dummy for base class constructor
+    private static final InputStream DUMMY = new ByteArrayInputStream("".getBytes());
+    
+    /**
+     * Constructor.
+     * @param input Data to read from. Note that calls to unread() will
+     * modify this array! If this is not desired, pass a copy.
+     * 
+     * @throws IOException If there is an IO error.
+     */
+    public ByteArrayPushBackInputStream(byte[] input) throws IOException
+    {
+        super(DUMMY, 1);
+        data = input;
+        datapos = 0;
+        save = datapos;
+        datalen = input != null ? input.length : 0;
+    }
+    
+    /**
+     * This will peek at the next byte.
+     *
+     * @return The next byte on the stream, leaving it as available to read.
+     */
+    public int peek()
+    {
+        try
+        {
+            // convert negative values to 128..255
+            return (data[datapos] + 0x100) & 0xff;
+        }
+        catch (ArrayIndexOutOfBoundsException ex)
+        {
+            // could check this before, but this is a rare case 
+            // and this method is called sufficiently often to justify this
+            // optimization
+            return -1;
+        }
+    }
+
+    /**
+     * A simple test to see if we are at the end of the stream.
+     *
+     * @return true if we are at the end of the stream.
+     */
+    public boolean isEOF()
+    {
+        return datapos >= datalen;
+    }
+    
+    /**
+     * Save the state of this stream.
+     * @param readlimit Has no effect.
+     * @see InputStream#mark(int)
+     */
+    public void mark(int readlimit)
+    {
+        if (false)
+        {
+            ++readlimit; // avoid unused param warning
+        }
+        save = datapos;
+    }
+    
+    /**
+     * Check if mark is supported.
+     * @return Always true.
+     * @see InputStream#markSupported()
+     */
+    public boolean markSupported()
+    {
+        return true;
+    }
+    
+    /**
+     * Restore the state of this stream to the last saveState call.
+     * @see InputStream#reset()
+     */
+    public void reset()
+    {
+        datapos = save;
+    }
+    
+    /** Available bytes.
+     * @see InputStream#available()
+     * @return Available bytes.
+     */
+    public int available()
+    {
+        int av = datalen - datapos;
+        return av > 0 ? av : 0;
+    }
+    
+    /** Totally available bytes in the underlying array.
+     * @return Available bytes.
+     */
+    public int size()
+    {
+        return datalen;
+    }
+    
+    /**
+     * Pushes back a byte. 
+     * After this method returns, the next byte to be read will have the value (byte)by.
+     * @param by the int value whose low-order byte is to be pushed back. 
+     * @throws IOException - If there is not enough room in the buffer for the byte.
+     * @see java.io.PushbackInputStream#unread(int)
+     */
+    public void unread(int by) throws IOException
+    {
+        if (datapos == 0) 
+        {
+            throw new IOException("ByteArrayParserInputStream.unread(int): " +
+                                  "cannot unread 1 byte at buffer position " + datapos);
+        }
+        --datapos;
+        data[datapos] = (byte)by;
+    }
+
+    /**
+     * Pushes back a portion of an array of bytes by copying it to the 
+     * front of the pushback buffer. After this method returns, the next byte 
+     * to be read will have the value b[off], the byte after that will have 
+     * the value b[off+1], and so forth.
+     * @param buffer the byte array to push back.
+     * @param off the start offset of the data.
+     * @param len the number of bytes to push back. 
+     * @throws IOException If there is not enough room in the pushback buffer 
+     * for the specified number of bytes.
+     * @see java.io.PushbackInputStream#unread(byte[], int, int)
+     */
+    public void unread(byte[] buffer, int off, int len) throws IOException
+    {
+        if (len <= 0 || off >= buffer.length) 
+        {
+            return;
+        }
+        if (off < 0) 
+        {
+            off = 0;
+        }
+        if (len > buffer.length) 
+        {
+            len = buffer.length;
+        }
+        localUnread(buffer, off, len);
+    }
+    
+    /**
+     * Pushes back a portion of an array of bytes by copying it to the 
+     * front of the pushback buffer. After this method returns, the next byte 
+     * to be read will have the value buffer[0], the byte after that will have 
+     * the value buffer[1], and so forth.
+     * @param buffer the byte array to push back.
+     * @throws IOException If there is not enough room in the pushback buffer 
+     * for the specified number of bytes.
+     * @see java.io.PushbackInputStream#unread(byte[])
+     */
+    public void unread(byte[] buffer) throws IOException
+    {
+        localUnread(buffer, 0, buffer.length);
+    }
+ 
+    /**
+     * Pushes back a portion of an array of bytes by copying it to the 
+     * front of the pushback buffer. After this method returns, the next byte 
+     * to be read will have the value buffer[off], the byte after that will have 
+     * the value buffer[off+1], and so forth.
+     * Internal method that assumes off and len to be valid.
+     * @param buffer the byte array to push back.
+     * @param off the start offset of the data.
+     * @param len the number of bytes to push back. 
+     * @throws IOException If there is not enough room in the pushback buffer 
+     * for the specified number of bytes.
+     * @see java.io.PushbackInputStream#unread(byte[], int, int)
+     */
+    private void localUnread(byte[] buffer, int off, int len) throws IOException
+    {
+        if (datapos < len) 
+        {
+            throw new IOException("ByteArrayParserInputStream.unread(int): " +
+                                  "cannot unread " + len + 
+                                  " bytes at buffer position " + datapos);
+        }
+        datapos -= len;
+        System.arraycopy(buffer, off, data, datapos, len);
+    }
+       
+    /** 
+     * Read a byte.
+     * @see InputStream#read()
+     * @return Byte read or -1 if no more bytes are available.
+     */
+    public int read() 
+    {
+        try
+        {
+            // convert negative values to 128..255
+            return (data[datapos++] + 0x100) & 0xff;
+        }
+        catch (ArrayIndexOutOfBoundsException ex)
+        {
+            // could check this before, but this is a rare case 
+            // and this method is called sufficiently often to justify this
+            // optimization
+            datapos = datalen;
+            return -1;
+        }
+    }
+    
+    /** 
+     * Read a number of bytes.
+     * @see InputStream#read(byte[])
+     * @param buffer the buffer into which the data is read.
+     * @return 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.
+     */
+    public int read(byte[] buffer)
+    {
+        return localRead(buffer, 0, buffer.length);
+    }
+    
+    /** 
+     * Read a number of bytes.
+     * @see InputStream#read(byte[], int, int)
+     * @param buffer the buffer into which the data is read.
+     * @param off the start offset in array buffer at which the data is written.
+     * @param len the maximum number of bytes to read.
+     * @return 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.
+     */
+    public int read(byte[] buffer, int off, int len)
+    {
+        if (len <= 0 || off >= buffer.length) 
+        {
+            return 0;
+        }
+        if (off < 0) 
+        {
+            off = 0;
+        }
+        if (len > buffer.length) 
+        {
+            len = buffer.length;
+        }
+        return localRead(buffer, off, len);
+    }
+    
+    
+    /** 
+     * Read a number of bytes. Internal method that assumes off and len to be 
+     * valid.
+     * @see InputStream#read(byte[], int, int)
+     * @param buffer the buffer into which the data is read.
+     * @param off the start offset in array buffer at which the data is written.
+     * @param len the maximum number of bytes to read.
+     * @return 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.
+     */
+    public int localRead(byte[] buffer, int off, int len)
+    {
+        if (len == 0) 
+        {
+            return 0; // must return 0 even if at end!
+        }
+        else if (datapos >= datalen) 
+        {
+            return -1;
+        }
+        else 
+        {
+            int newpos = datapos + len;
+            if (newpos > datalen) 
+            {
+                newpos = datalen;
+                len = newpos - datapos;
+            }
+            System.arraycopy(data, datapos, buffer, off, len);
+            datapos = newpos;
+            return len;
+        }
+    }
+    
+    /**
+     * Skips over and discards n bytes of data from this input stream. 
+     * The skip method may, for a variety of reasons, end up skipping over some 
+     * smaller number of bytes, possibly 0. This may result from any of a number 
+     * of conditions; reaching end of file before n bytes have been skipped is 
+     * only one possibility. The actual number of bytes skipped is returned. 
+     * If n is negative, no bytes are skipped.
+     * @param num the number of bytes to be skipped. 
+     * @return the actual number of bytes skipped. 
+     * @see InputStream#skip(long)
+     */
+    public long skip(long num)
+    {
+        if (num <= 0) 
+        {
+            return 0;
+        }
+        else 
+        {
+            long newpos = datapos + num;
+            if (newpos >= datalen) 
+            {
+                num = datalen - datapos;
+                datapos = datalen;
+            }
+            else 
+            {
+                datapos = (int)newpos;
+            }
+            return num;
+        }
+    }
+    
+    /** Position the stream at a given index. Positioning the stream
+     * at position size() will cause the next call to read() to return -1.
+     * 
+     * @param newpos Position in the underlying array. A negative value will be 
+     * interpreted as 0, a value greater than size() as size().
+     * @return old position.
+     */
+    public int seek(int newpos)
+    {
+        if (newpos < 0) 
+        {
+            newpos = 0;
+        }
+        else if (newpos > datalen)
+        {
+            newpos = datalen;
+        }
+        int oldpos = pos;
+        pos = newpos;
+        return oldpos;
+    }
+
+}
diff --git a/src/main/java/org/pdfbox/io/FastByteArrayOutputStream.java b/src/main/java/org/pdfbox/io/FastByteArrayOutputStream.java
new file mode 100644
index 0000000..1e5fdc6
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/FastByteArrayOutputStream.java
@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.ByteArrayOutputStream;
+
+/**
+ * An byte array output stream that allows direct access to the byte array.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.3 $
+ */
+public class FastByteArrayOutputStream extends ByteArrayOutputStream
+{
+    /**
+     * Constructor.
+     *
+     * @param size An initial size of the stream.
+     */
+    public FastByteArrayOutputStream( int size )
+    {
+        super( size );
+    }
+
+    /**
+     * This will get the underlying byte array.
+     *
+     * @return The underlying byte array at this moment in time.
+     */
+    public byte[] getByteArray()
+    {
+        return buf;
+    }
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/NBitInputStream.java b/src/main/java/org/pdfbox/io/NBitInputStream.java
new file mode 100644
index 0000000..d8254b2
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/NBitInputStream.java
@@ -0,0 +1,124 @@
+/**
+  * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * This is an n-bit input stream.  This means that you can read chunks of data
+ * as any number of bits, not just 8 bits like the regular input stream.  Just set the
+ * number of bits that you would like to read on each call.  The default is 8.
+ *
+ * @author  Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.3 $
+ */
+public class NBitInputStream
+{
+    private int bitsInChunk;
+    private InputStream in;
+
+    private int currentByte;
+    private int bitsLeftInCurrentByte;
+
+    /**
+     * Constructor.
+     *
+     * @param is The input stream to read from.
+     */
+    public NBitInputStream( InputStream is )
+    {
+        in = is;
+        bitsLeftInCurrentByte = 0;
+        bitsInChunk = 8;
+    }
+
+    /**
+     * This will unread some data.
+     *
+     * @param data The data to put back into the stream.
+     */
+    public void unread( long data )
+    {
+        data <<= bitsLeftInCurrentByte;
+        currentByte |= data;
+        bitsLeftInCurrentByte += bitsInChunk;
+    }
+
+    /**
+     * This will read the next n bits from the stream and return the unsigned
+     * value of  those bits.
+     *
+     * @return The next n bits from the stream.
+     *
+     * @throws IOException If there is an error reading from the underlying stream.
+     */
+    public long read() throws IOException
+    {
+        long retval = 0;
+        for( int i=0; i<bitsInChunk && retval != -1; i++ )
+        {
+            if( bitsLeftInCurrentByte == 0 )
+            {
+                currentByte = in.read();
+                bitsLeftInCurrentByte = 8;
+            }
+            if( currentByte == -1 )
+            {
+                retval = -1;
+            }
+            else
+            {
+                retval <<= 1;
+                retval |= ((currentByte >> (bitsLeftInCurrentByte-1))&0x1);
+                bitsLeftInCurrentByte--;
+            }
+        }
+        return retval;
+    }
+
+    /** Getter for property bitsToRead.
+     * @return Value of property bitsToRead.
+     */
+    public int getBitsInChunk()
+    {
+        return bitsInChunk;
+    }
+
+    /** Setter for property bitsToRead.
+     * @param bitsInChunkValue New value of property bitsToRead.
+     */
+    public void setBitsInChunk(int bitsInChunkValue)
+    {
+        bitsInChunk = bitsInChunkValue;
+    }
+
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/NBitOutputStream.java b/src/main/java/org/pdfbox/io/NBitOutputStream.java
new file mode 100644
index 0000000..f944b8a
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/NBitOutputStream.java
@@ -0,0 +1,116 @@
+/**
+  * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.OutputStream;
+import java.io.IOException;
+
+/**
+ * This is an n-bit output stream.  This means that you write data in n-bit chunks.
+ *
+ * @author  Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.3 $
+ */
+public class NBitOutputStream
+{
+    private int bitsInChunk;
+    private OutputStream out;
+
+    private int currentByte;
+    private int positionInCurrentByte;
+
+    /**
+     * Constructor.
+     *
+     * @param os The output stream to write to.
+     */
+    public NBitOutputStream( OutputStream os )
+    {
+        out = os;
+        currentByte = 0;
+        positionInCurrentByte = 7;
+    }
+
+    /**
+     * This will write the next n-bits to the stream.
+     *
+     * @param chunk The next chunk of data to write.
+     *
+     * @throws IOException If there is an error writing the chunk.
+     */
+    public void write( long chunk ) throws IOException
+    {
+        long bitToWrite;
+        for( int i=(bitsInChunk-1); i>=0; i-- )
+        {
+            bitToWrite = (chunk >> i) & 0x1;
+            bitToWrite <<= positionInCurrentByte;
+            currentByte |= bitToWrite;
+            positionInCurrentByte--;
+            if( positionInCurrentByte < 0 )
+            {
+                out.write( currentByte );
+                currentByte = 0;
+                positionInCurrentByte = 7;
+            }
+        }
+    }
+
+    /**
+     * This will close the stream.
+     *
+     * @throws IOException if there is an error closing the stream.
+     */
+    public void close() throws IOException
+    {
+        if( positionInCurrentByte < 7 )
+        {
+            out.write( currentByte );
+        }
+    }
+
+    /** Getter for property bitsToRead.
+     * @return Value of property bitsToRead.
+     */
+    public int getBitsInChunk()
+    {
+        return bitsInChunk;
+    }
+
+    /** Setter for property bitsToRead.
+     * @param bitsInChunkValue New value of property bitsToRead.
+     */
+    public void setBitsInChunk(int bitsInChunkValue)
+    {
+        bitsInChunk = bitsInChunkValue;
+    }
+
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/PushBackInputStream.java b/src/main/java/org/pdfbox/io/PushBackInputStream.java
new file mode 100644
index 0000000..d519900
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/PushBackInputStream.java
@@ -0,0 +1,92 @@
+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * A simple subclass that adds a few convience methods.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.4 $
+ */
+public class PushBackInputStream extends java.io.PushbackInputStream
+{
+
+    /**
+     * Constructor.
+     *
+     * @param input The input stream.
+     * @param size The size of the push back buffer.
+     * 
+     * @throws IOException If there is an error with the stream. 
+     */
+    public PushBackInputStream( InputStream input, int size ) throws IOException
+    {
+        super( input, size );
+        if( input == null )
+        {
+            throw new IOException( "Error: input was null" );
+        }
+    }
+
+    /**
+     * This will peek at the next byte.
+     *
+     * @return The next byte on the stream, leaving it as available to read.
+     *
+     * @throws IOException If there is an error reading the next byte.
+     */
+    public int peek() throws IOException
+    {
+        int result = read();
+        if( result != -1 )
+        {
+            unread( result );
+        }
+        return result;
+    }
+
+    /**
+     * A simple test to see if we are at the end of the stream.
+     *
+     * @return true if we are at the end of the stream.
+     *
+     * @throws IOException If there is an error reading the next byte.
+     */
+    public boolean isEOF() throws IOException
+    {
+        int peek = peek();
+        return peek == -1;
+    }
+    
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/RandomAccessFileInputStream.java b/src/main/java/org/pdfbox/io/RandomAccessFileInputStream.java
new file mode 100644
index 0000000..6589bcb
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/RandomAccessFileInputStream.java
@@ -0,0 +1,132 @@
+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+/**
+ * This class allows a section of a RandomAccessFile to be accessed as an
+ * input stream.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.3 $
+ */
+public class RandomAccessFileInputStream extends InputStream
+{
+    private RandomAccessFile file;
+    private long currentPosition;
+    private long endPosition;
+
+    /**
+     * Constructor.
+     *
+     * @param raFile The file to read the data from.
+     * @param startPosition The position in the file that this stream starts.
+     * @param length The length of the input stream.
+     */
+    public RandomAccessFileInputStream( RandomAccessFile raFile, long startPosition, long length )
+    {
+        file = raFile;
+        currentPosition = startPosition;
+        endPosition = currentPosition+length;
+    }
+    /**
+     * @see InputStream#available()
+     */
+    public int available()
+    {
+        return (int)(endPosition - currentPosition);
+    }
+    /**
+     * @see InputStream#close()
+     */
+    public void close()
+    {
+        //do nothing because we want to leave the random access file open.
+    }
+    /**
+     * @see InputStream#read()
+     */
+    public int read() throws IOException
+    {
+        synchronized(file)
+        {
+            int retval = -1;
+            if( currentPosition < endPosition )
+            {
+                file.seek( currentPosition );
+                currentPosition++;
+                retval = file.read();
+            }
+            return retval;
+        }
+    }
+    /**
+     * @see InputStream#read( byte[], int, int )
+     */
+    public int read( byte[] b, int offset, int length ) throws IOException
+    {
+        //only allow a read of the amount available.
+        if( length > available() )
+        {
+            length = available();
+        }
+        int amountRead = -1;
+        //only read if there are bytes actually available, otherwise
+        //return -1 if the EOF has been reached.
+        if( available() > 0 )
+        {
+            synchronized(file)
+            {
+                file.seek( currentPosition );
+                amountRead = file.read( b, offset, length );
+            }
+        }
+        //update the current cursor position.
+        if( amountRead > 0 )
+        {
+            currentPosition += amountRead;
+        }
+        return amountRead;
+    }
+
+    /**
+     * @see InputStream#skip( long )
+     */
+    public long skip( long amountToSkip )
+    {
+        long amountSkipped = Math.min( amountToSkip, available() );
+        currentPosition+= amountSkipped;
+        return amountSkipped;
+    }
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/RandomAccessFileOutputStream.java b/src/main/java/org/pdfbox/io/RandomAccessFileOutputStream.java
new file mode 100644
index 0000000..b2e7511
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/RandomAccessFileOutputStream.java
@@ -0,0 +1,145 @@
+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.RandomAccessFile;
+
+import org.pdfbox.cos.COSBase;
+import org.pdfbox.cos.COSObject;
+import org.pdfbox.cos.COSNumber;
+
+/**
+ * This will write to a RandomAccessFile in the filesystem and keep track
+ * of the position it is writing to and the length of the stream.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.3 $
+ */
+public class RandomAccessFileOutputStream extends OutputStream
+{
+    private RandomAccessFile file;
+    private long position;
+    private long lengthWritten = 0;
+    private COSBase expectedLength = null;
+
+    /**
+     * Constructor to create an output stream that will write to the end of a
+     * random access file.
+     *
+     * @param raf The file to write to.
+     *
+     * @throws IOException If there is a problem accessing the raf.
+     */
+    public RandomAccessFileOutputStream( RandomAccessFile raf ) throws IOException
+    {
+        file = raf;
+        //first get the position that we will be writing to
+        position = raf.length();
+    }
+
+    /**
+     * This will get the position in the RAF that the stream was written
+     * to.
+     *
+     * @return The position in the raf where the file can be obtained.
+     */
+    public long getPosition()
+    {
+        return position;
+    }
+
+    /**
+     * The number of bytes written to the stream.
+     *
+     * @return The number of bytes read to the stream.
+     */
+    public long getLength()
+    {
+        long length = -1;
+        if( expectedLength instanceof COSNumber )
+        {
+            length = ((COSNumber)expectedLength).intValue();
+        }
+        else if( expectedLength instanceof COSObject &&
+                 ((COSObject)expectedLength).getObject() instanceof COSNumber )
+        {
+            length = ((COSNumber)((COSObject)expectedLength).getObject()).intValue();
+        }
+        if( length == -1 )
+        {
+            length = lengthWritten;
+        }
+        return length;
+    }
+
+    /**
+     * @see OutputStream#write( byte[], int, int )
+     */
+    public void write( byte[] b, int offset, int length ) throws IOException
+    {
+        file.seek( position+lengthWritten );
+        lengthWritten += length;
+        file.write( b, offset, length );
+
+    }
+    /**
+     * @see OutputStream#write( int )
+     */
+    public void write( int b ) throws IOException
+    {
+        file.seek( position+lengthWritten );
+        lengthWritten++;
+        file.write( b );
+    }
+
+    /**
+     * This will get the length that the PDF document specified this stream
+     * should be.  This may not match the number of bytes read.
+     *
+     * @return The expected length.
+     */
+    public COSBase getExpectedLength()
+    {
+        return expectedLength;
+    }
+
+    /**
+     * This will set the expected length of this stream.
+     *
+     * @param value The expected value.
+     */
+    public void setExpectedLength(COSBase value)
+    {
+        expectedLength = value;
+    }
+}
+\ No newline at end of file
diff --git a/src/main/java/org/pdfbox/io/package.html b/src/main/java/org/pdfbox/io/package.html
new file mode 100644
index 0000000..12261f4
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/package.html
@@ -0,0 +1,9 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
+<html>
+<head>
+
+</head>
+<body>
+This package contains IO streams.
+</body>
+</html>
author	tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>	2006-12-01 12:20:24 +0000
committer	tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>	2006-12-01 12:20:24 +0000
commit	6025b6016517c6d898d8957d1d7e03ba71431912 (patch)
tree	b15bd6fa5ffe9588a9bca3f2b8a7e358f83b6eba /src/main/java/org/pdfbox/io
parent	d2c77e820ab4aba8235d71275755021347b3ad10 (diff)
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