From 535a04fa05f739ec16dd81666e3b0f82dfbd442d Mon Sep 17 00:00:00 2001 From: tknall Date: Wed, 9 Jan 2013 15:41:29 +0000 Subject: pdf-as-lib maven project files moved to pdf-as-lib git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/pdf-as/trunk@926 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c --- .../helper/VerificationFilterBinaryHelper.java | 190 +++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java (limited to 'pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java') diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java new file mode 100644 index 0000000..735b874 --- /dev/null +++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/vfilter/helper/VerificationFilterBinaryHelper.java @@ -0,0 +1,190 @@ +/** + * Copyright 2006 by Know-Center, Graz, Austria + * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a + * joint initiative of the Federal Chancellery Austria and Graz University of + * Technology. + * + * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by + * the European Commission - subsequent versions of the EUPL (the "Licence"); + * You may not use this work except in compliance with the Licence. + * You may obtain a copy of the Licence at: + * http://www.osor.eu/eupl/ + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the Licence is distributed on an "AS IS" basis, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the Licence for the specific language governing permissions and + * limitations under the Licence. + * + * This product combines work with different licenses. See the "NOTICE" text + * file for details on the various modules and licenses. + * The "NOTICE" text file is part of the distribution. Any derivative works + * that you distribute must include a readable copy of the "NOTICE" text file. + */ +package at.gv.egiz.pdfas.impl.vfilter.helper; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; + +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' }; + + /** + * The log. + */ + private static final Log log = LogFactory.getLog(VerificationFilterBinaryHelper.class); + + /** + * Tells, if the given incremental update block contains a binary signature. + * + *

+ * According to definition, if a block is a binary block, it must/cannot + * contain other signatures than this one. + *

+ * + * @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(); + + int linesToProcess = (kz_apr.elements.size() / 2); + log.trace("Lines to process for KZ: " + linesToProcess); + /* + if (linesToProcess > 1) { + log.debug("Multiple KZHOTFIX: forcing single line to process"); + linesToProcess = 1; + } + */ + for (int i = 0; i < linesToProcess; 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; + si.pdf = pdf; + + log.trace("Adding KZ: " + si.toString()); + + 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); + } + } + +} -- cgit v1.2.3