pdfbox-trunk/preflight/src/main/java/org/apache/pdfbox/preflight/process/XRefValidationProcess.java
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 * to you under the Apache License, Version 2.0 (the
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package org.apache.pdfbox.preflight.process;

import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.preflight.PreflightConstants;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_SYNTAX_INDIRECT_OBJ_RANGE;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_SYNTAX_TRAILER;
import org.apache.pdfbox.preflight.PreflightContext;
import org.apache.pdfbox.preflight.ValidationResult.ValidationError;
import org.apache.pdfbox.preflight.exception.ValidationException;

public class XRefValidationProcess extends AbstractProcess
{

    @Override
    public void validate(PreflightContext ctx) throws ValidationException
    {
        COSDocument document = ctx.getDocument().getDocument();
        if (document.isXRefStream())
        {
            addValidationError(ctx, new ValidationError(ERROR_SYNTAX_TRAILER, "/XRef cross reference streams are not allowed"));
        }
        if (document.getXrefTable().size() > PreflightConstants.MAX_INDIRECT_OBJ)
        {
            addValidationError(ctx, new ValidationError(ERROR_SYNTAX_INDIRECT_OBJ_RANGE, "Too many indirect objects"));
        }
    }

}
