Performance

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@167 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c

1 files changed, 152 insertions, 0 deletions

diff --git a/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java b/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java
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+/**

+ * 

+ */

+package at.gv.egiz.pdfas.impl.vfilter.helper;

+

+import java.io.IOException;

+import java.util.ArrayList;

+import java.util.List;

+

+import at.gv.egiz.pdfas.exceptions.ErrorCode;

+

+import at.knowcenter.wag.egov.egiz.PdfASID;

+import at.knowcenter.wag.egov.egiz.exceptions.InvalidIDException;

+import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;

+import at.knowcenter.wag.egov.egiz.pdf.BinarySignature;

+import at.knowcenter.wag.egov.egiz.pdf.Placeholder;

+import at.knowcenter.wag.egov.egiz.pdf.StringInfo;

+import at.knowcenter.wag.exactparser.parsing.IndirectObjectReference;

+import at.knowcenter.wag.exactparser.parsing.PDFUtils;

+import at.knowcenter.wag.exactparser.parsing.results.ArrayParseResult;

+import at.knowcenter.wag.exactparser.parsing.results.DictionaryParseResult;

+import at.knowcenter.wag.exactparser.parsing.results.FooterParseResult;

+import at.knowcenter.wag.exactparser.parsing.results.IndirectObjectReferenceParseResult;

+import at.knowcenter.wag.exactparser.parsing.results.NumberParseResult;

+import at.knowcenter.wag.exactparser.parsing.results.ObjectParseResult;

+

+/**

+ * Contains helpful methods used by the VerificationFilter to analyze the PDF for binary signatures.

+ * 

+ * @author wprinz

+ */

+public final class VerificationFilterBinaryHelper

+{

+  /**

+   * The name of the egiz dict key.

+   */

+  public static final byte[] EGIZ_DICT_NAME = { 'E', 'G', 'I', 'Z', 'S', 'i', 'g', 'D', 'i', 'c', 't' };

+

+  /**

+   * The name of the ID (SIG_KZ) property in the egiz dict.

+   */

+  public static final byte[] EGIZ_KZ_NAME = { 'I', 'D' };

+

+  /**

+   * Tells, if the given incremental update block contains a binary signature.

+   * 

+   * <p>

+   * According to definition, if a block is a binary block, it must/cannot

+   * contain other signatures than this one.

+   * </p>

+   * 

+   * @param block

+   *          The incremental update block.

+   * @return Returns true, if this block is a binary signature block, false

+   *         otherwise.

+   */

+  public static boolean containsEGIZDict(final byte[] pdf, final FooterParseResult block)

+  {

+    int dict_index = PDFUtils.indexOfName(pdf, block.tpr.dpr.names, EGIZ_DICT_NAME);

+    if (dict_index <= 0)

+    {

+      return false;

+    }

+

+    return true;

+  }

+

+  /**

+   * Extracts the PDF AS ID of the egiz block.

+   * 

+   * @param pdf

+   *          The pdf.

+   * @param block

+   *          The IU block.

+   * @return Returns the extracted PDF AS ID.

+   * @throws PDFDocumentException

+   *           Forwarded exception.

+   * @throws InvalidIDException

+   *           Forwarded exception.

+   */

+  public static PdfASID extractKZFromEGIZBlock(final byte[] pdf, final FooterParseResult block) throws PDFDocumentException, InvalidIDException

+  {

+    int egiz_index = PDFUtils.indexOfName(pdf, block.tpr.dpr.names, EGIZ_DICT_NAME);

+    if (egiz_index < 0)

+    {

+      throw new PDFDocumentException(301, "egiz_index = " + egiz_index);

+    }

+

+    IndirectObjectReferenceParseResult egiz_dict_iorpr = (IndirectObjectReferenceParseResult) block.tpr.dpr.values.get(egiz_index);

+    // logger_.debug("egiz_dict_ir = " + egiz_dict_iorpr.ior.object_number

+    // + " " + egiz_dict_iorpr.ior.generation_number);

+

+    IndirectObjectReference ior = egiz_dict_iorpr.ior;

+

+    final int egiz_dict_offset = PDFUtils.getObjectOffsetFromXRefByIndirectObjectReference(block.xpr, ior);

+    // logger_.debug("egiz_dict_offset = " + egiz_dict_offset);

+

+    ObjectParseResult obj = PDFUtils.parseObject(pdf, egiz_dict_offset);

+    DictionaryParseResult egiz_dict = (DictionaryParseResult) obj.object;

+

+    int kz_index = PDFUtils.indexOfName(pdf, egiz_dict.names, EGIZ_KZ_NAME);

+    if (kz_index < 0)

+    {

+      throw new PDFDocumentException(301, "kz_index = " + kz_index);

+    }

+    ArrayParseResult kz_apr = (ArrayParseResult) egiz_dict.values.get(kz_index);

+

+    String kz_string = restoreKZ(pdf, kz_apr);

+    PdfASID kz = new PdfASID(kz_string);

+

+    return kz;

+  }

+

+  /**

+   * Restores the Kennzeichnung String from an Array.

+   * 

+   * @param pdf

+   *          The PDF.

+   * @param kz_apr

+   *          The Array, as parsed from the EGIZ Dict.

+   * @return Returns the restored KZ.

+   * @throws PDFDocumentException

+   *           Forwarded exception.

+   */

+  public static String restoreKZ(byte[] pdf, ArrayParseResult kz_apr) throws PDFDocumentException

+  {

+    try

+    {

+      List partition = new ArrayList();

+

+      for (int i = 0; i < kz_apr.elements.size() / 2; i++)

+      {

+        NumberParseResult start_npr = (NumberParseResult) kz_apr.elements.get(i * 2);

+        NumberParseResult length_npr = (NumberParseResult) kz_apr.elements.get(i * 2 + 1);

+

+        StringInfo si = new StringInfo();

+        si.string_start = start_npr.number;

+        si.string_length = length_npr.number;

+

+        partition.add(si);

+      }

+

+      String KZ = Placeholder.reconstructStringFromPartition(pdf, partition, BinarySignature.ENCODING_WIN);

+      return KZ;

+    }

+    catch (IOException e1)

+    {

+      throw new PDFDocumentException(ErrorCode.DOCUMENT_CANNOT_BE_READ, e1);

+    }

+  }

+

+}