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gnujpdf reformat
This commit is contained in:
Jindra Petřík
@@ -25,194 +25,198 @@ import java.io.*;
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import java.util.*;
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/**
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* This class is used to write a PDF document. It acts as a wrapper
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* to a real OutputStream, but is necessary for certain internal PDF
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* structures to be built correctly.
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* This class is used to write a PDF document. It acts as a wrapper to a real
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* OutputStream, but is necessary for certain internal PDF structures to be
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* built correctly.
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*
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* @author Peter T. Mount
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* @author Eric Z. Beard, ericzbeard@hotmail.com
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* @version $Revision: 1.3 $, $Date: 2007/09/22 12:48:16 $
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*/
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public class PDFOutput
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{
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/**
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* This is the actual OutputStream used to write to.
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*/
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protected OutputStream os;
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/**
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* This is the OutputStream used to write each object to.
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*
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* <p>We use a separate stream, because we need to keep track of how
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* many bytes have been written for each object for the xref table to
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* work correctly.
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*/
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protected ByteArrayOutputStream baos;
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/**
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* This is the current position within the stream
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*/
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protected int offset;
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/**
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* This vector contains offsets of each object
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*/
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protected Vector<PDFXref> offsets;
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/**
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* This is used to track the /Root object (catalog)
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*/
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protected PDFObject rootID;
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/**
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* This is used to track the /Info object (info)
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*/
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protected PDFObject infoID;
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/**
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* This creates a PDF OutputStream
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*
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* @param os The output stream to write the PDF file to.
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* @throws IOException if there is an I/O error.
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*/
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public PDFOutput(OutputStream os) throws IOException
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{
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this.os = os;
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offset = 0;
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offsets = new Vector<PDFXref>();
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baos = new ByteArrayOutputStream();
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// Now write the PDF header
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//
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// Note: As the encoding is fixed here, we use getBytes().
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//
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baos.write("%PDF-1.2\n".getBytes());
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// This second comment is advised in the PDF Reference manual
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// page 61
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baos.write("%\342\343\317\323\n".getBytes());
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offset = baos.size();
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baos.writeTo(os);
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}
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/**
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* This method writes a PDFObject to the stream.
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*
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* @param ob PDFObject Obeject to write
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* @exception IOException on error
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*/
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protected void write(PDFObject ob) throws IOException
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{
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// Check the object to see if it's one that is needed in the trailer
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// object
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if(ob instanceof PDFCatalog) rootID=ob;
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if(ob instanceof PDFInfo) infoID=ob;
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offsets.addElement(new PDFXref(ob.getSerialID(),offset));
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baos.reset();
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ob.write(baos);
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offset+=baos.size();
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baos.writeTo(os);
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}
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/**
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* This closes the Stream, writing the xref table
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*/
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protected void close() throws IOException
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{
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// Make sure everything is written
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os.flush();
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// we use baos to speed things up a little.
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// Also, offset is preserved, and marks the begining of this block.
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// This is required by PDF at the end of the PDF file.
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baos.reset();
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baos.write("xref\n".getBytes());
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// Now a single subsection for object 0
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//baos.write("0 1\n0000000000 65535 f \n".getBytes());
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// Now scan through the offsets list. The should be in sequence,
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// but just in case:
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int firstid = 0; // First id in block
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int lastid = -1; // The last id used
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Vector<PDFXref> block = new Vector<PDFXref>(); // xrefs in this block
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// We need block 0 to exist
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block.addElement(new PDFXref(0,0,65535));
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for(PDFXref x : offsets) {
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if(firstid==-1) firstid=x.id;
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// check to see if block is in range (-1 means empty)
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if(lastid>-1 && x.id != (lastid+1)) {
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// no, so write this block, and reset
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writeblock(firstid,block);
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block.removeAllElements();
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firstid=-1;
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}
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// now add to block
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block.addElement(x);
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lastid = x.id;
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public class PDFOutput {
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/**
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* This is the actual OutputStream used to write to.
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*/
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protected OutputStream os;
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/**
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* This is the OutputStream used to write each object to.
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*
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* <p>
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* We use a separate stream, because we need to keep track of how many bytes
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* have been written for each object for the xref table to work correctly.
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*/
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protected ByteArrayOutputStream baos;
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/**
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* This is the current position within the stream
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*/
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protected int offset;
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/**
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* This vector contains offsets of each object
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*/
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protected Vector<PDFXref> offsets;
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/**
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* This is used to track the /Root object (catalog)
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*/
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protected PDFObject rootID;
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/**
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* This is used to track the /Info object (info)
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*/
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protected PDFObject infoID;
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/**
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* This creates a PDF OutputStream
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*
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* @param os The output stream to write the PDF file to.
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* @throws IOException if there is an I/O error.
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*/
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public PDFOutput(OutputStream os) throws IOException {
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this.os = os;
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offset = 0;
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offsets = new Vector<PDFXref>();
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baos = new ByteArrayOutputStream();
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// Now write the PDF header
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//
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// Note: As the encoding is fixed here, we use getBytes().
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//
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baos.write("%PDF-1.2\n".getBytes());
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// This second comment is advised in the PDF Reference manual
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// page 61
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baos.write("%\342\343\317\323\n".getBytes());
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offset = baos.size();
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baos.writeTo(os);
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}
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// now write the last block
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if(firstid>-1)
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writeblock(firstid,block);
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// now the trailer object
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baos.write("trailer\n<<\n".getBytes());
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// the number of entries (REQUIRED)
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baos.write("/Size ".getBytes());
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baos.write(Integer.toString(offsets.size()+1).getBytes());
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baos.write("\n".getBytes());
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// the /Root catalog indirect reference (REQUIRED)
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if(rootID != null) {
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baos.write("/Root ".getBytes());
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baos.write(rootID.toString().getBytes());
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baos.write("\n".getBytes());
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} else
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throw new IOException("Root object is not present in document");
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// the /Info reference (OPTIONAL)
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if(infoID != null) {
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baos.write("/Info ".getBytes());
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baos.write(infoID.toString().getBytes());
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baos.write("\n".getBytes());
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/**
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* This method writes a PDFObject to the stream.
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*
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* @param ob PDFObject Obeject to write
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* @exception IOException on error
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*/
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protected void write(PDFObject ob) throws IOException {
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// Check the object to see if it's one that is needed in the trailer
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// object
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if (ob instanceof PDFCatalog) {
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rootID = ob;
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}
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if (ob instanceof PDFInfo) {
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infoID = ob;
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}
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offsets.addElement(new PDFXref(ob.getSerialID(), offset));
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baos.reset();
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ob.write(baos);
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offset += baos.size();
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baos.writeTo(os);
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}
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// end the trailer object
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baos.write(">>\nstartxref\n".getBytes());
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baos.write(Integer.toString(offset).getBytes());
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baos.write("\n%%EOF\n".getBytes());
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// now flush the stream
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baos.writeTo(os);
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os.flush();
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}
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/**
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* Writes a block of references to the PDF file
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* @param firstid ID of the first reference in this block
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* @param block Vector containing the references in this block
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* @exception IOException on write error
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*/
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protected void writeblock(int firstid,Vector<PDFXref> block) throws IOException
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{
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baos.write(Integer.toString(firstid).getBytes());
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baos.write(" ".getBytes());
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baos.write(Integer.toString(block.size()).getBytes());
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baos.write("\n".getBytes());
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//baos.write("\n0000000000 65535 f\n".getBytes());
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for(PDFXref x : block) {
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baos.write(x.toString().getBytes());
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baos.write("\n".getBytes());
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/**
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* This closes the Stream, writing the xref table
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*/
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protected void close() throws IOException {
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// Make sure everything is written
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os.flush();
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// we use baos to speed things up a little.
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// Also, offset is preserved, and marks the begining of this block.
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// This is required by PDF at the end of the PDF file.
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baos.reset();
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baos.write("xref\n".getBytes());
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// Now a single subsection for object 0
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//baos.write("0 1\n0000000000 65535 f \n".getBytes());
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// Now scan through the offsets list. The should be in sequence,
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// but just in case:
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int firstid = 0; // First id in block
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int lastid = -1; // The last id used
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Vector<PDFXref> block = new Vector<PDFXref>(); // xrefs in this block
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// We need block 0 to exist
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block.addElement(new PDFXref(0, 0, 65535));
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for (PDFXref x : offsets) {
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if (firstid == -1) {
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firstid = x.id;
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}
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// check to see if block is in range (-1 means empty)
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if (lastid > -1 && x.id != (lastid + 1)) {
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// no, so write this block, and reset
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writeblock(firstid, block);
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block.removeAllElements();
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firstid = -1;
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}
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// now add to block
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block.addElement(x);
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lastid = x.id;
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}
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// now write the last block
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if (firstid > -1) {
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writeblock(firstid, block);
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}
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// now the trailer object
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baos.write("trailer\n<<\n".getBytes());
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// the number of entries (REQUIRED)
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baos.write("/Size ".getBytes());
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baos.write(Integer.toString(offsets.size() + 1).getBytes());
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baos.write("\n".getBytes());
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// the /Root catalog indirect reference (REQUIRED)
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if (rootID != null) {
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baos.write("/Root ".getBytes());
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baos.write(rootID.toString().getBytes());
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baos.write("\n".getBytes());
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} else {
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throw new IOException("Root object is not present in document");
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}
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// the /Info reference (OPTIONAL)
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if (infoID != null) {
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baos.write("/Info ".getBytes());
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baos.write(infoID.toString().getBytes());
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baos.write("\n".getBytes());
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}
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// end the trailer object
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baos.write(">>\nstartxref\n".getBytes());
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baos.write(Integer.toString(offset).getBytes());
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baos.write("\n%%EOF\n".getBytes());
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// now flush the stream
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baos.writeTo(os);
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os.flush();
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}
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/**
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* Writes a block of references to the PDF file
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*
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* @param firstid ID of the first reference in this block
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* @param block Vector containing the references in this block
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* @exception IOException on write error
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*/
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protected void writeblock(int firstid, Vector<PDFXref> block) throws IOException {
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baos.write(Integer.toString(firstid).getBytes());
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baos.write(" ".getBytes());
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baos.write(Integer.toString(block.size()).getBytes());
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baos.write("\n".getBytes());
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//baos.write("\n0000000000 65535 f\n".getBytes());
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for (PDFXref x : block) {
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baos.write(x.toString().getBytes());
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baos.write("\n".getBytes());
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}
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}
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}
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} // end class PDFOutput
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