diff options
Diffstat (limited to 'src/main/java/org/pdfbox/io/ASCII85OutputStream.java')
| -rw-r--r-- | src/main/java/org/pdfbox/io/ASCII85OutputStream.java | 304 |
1 files changed, 304 insertions, 0 deletions
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();
+ }
+ }
+}
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