Example usage for com.lowagie.text.pdf PRTokeniser checkObjectStart

Introduction

In this page you can find the example usage for com.lowagie.text.pdf PRTokeniser checkObjectStart.

Prototype

public static int[] checkObjectStart(byte line[]) 

Source Link

Usage

From source file:org.signserver.module.pdfsigner.PDFSigner.java

License:Open Source License

private void checkForDuplicateObjects(byte[] pdfbytes) throws IOException, SignServerException {
    if (LOG.isDebugEnabled()) {
        LOG.debug(">checkForDuplicateObjects");
    }//w  w w  . ja  va 2  s .co m
    final PRTokeniser tokens = new PRTokeniser(pdfbytes);
    final Set<String> idents = new HashSet<String>();
    final byte[] line = new byte[16];

    while (tokens.readLineSegment(line)) {
        final int[] obj = PRTokeniser.checkObjectStart(line);
        if (obj != null) {
            final String ident = obj[0] + " " + obj[1];

            if (idents.add(ident)) {
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Object: " + ident);
                }
            } else {
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Duplicate object: " + ident);
                }
                throw new SignServerException("Incorrect document");
            }
        }
    }
    if (LOG.isDebugEnabled()) {
        LOG.debug("<checkForDuplicateObjects");
    }
}

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