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https://github.com/ONLYOFFICE/core.git
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341 lines
10 KiB
C++
341 lines
10 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2016
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
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* EU, LV-1021.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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*/
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#include "../../DesktopEditor/common/File.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include "StringExt.h"
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#include "Constants.h"
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#include "GlobalParams.h"
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#include "Page.h"
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#include "Catalog.h"
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#include "Stream.h"
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#include "XRef.h"
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#include "Link.h"
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#include "OutputDevice.h"
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#include "ErrorConstants.h"
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#include "Lexer.h"
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#include "Parser.h"
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#include "SecurityHandler.h"
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#include "Outline.h"
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#include "PDFDoc.h"
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#define HeaderSearchSize 1024 // Максимальное количество байт для считывания с начала файла, в которых мы ищем запись '%PDF'
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namespace PdfReader
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{
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//-------------------------------------------------------------------------------------------------------------------------------
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// PDFDoc
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//-------------------------------------------------------------------------------------------------------------------------------
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PDFDoc::PDFDoc(GlobalParams *pGlobalParams, const wchar_t* wsFileName, StringExt *seOwnerPassword, StringExt *seUserPassword)
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{
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m_pGlobalParams = pGlobalParams;
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m_bValid = false;
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m_eErrorCode = errorNone;
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m_pFile = NULL;
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m_pFileBuffer = NULL;
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m_pStream = NULL;
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m_pXref = NULL;
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m_pCatalog = NULL;
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m_pOutline = NULL;
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m_wsFileName = wsFileName;
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NSFile::CFileBinary oFile;
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oFile.OpenFile(wsFileName);
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long lFileSize = oFile.GetFileSize();
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m_pFileBuffer = new unsigned char[lFileSize];
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if (!m_pFileBuffer)
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{
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oFile.CloseFile();
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// Не смогли выделить память под весь файл, тогда работаем непосредственно с самим файлом
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m_pFileBuffer = NULL;
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m_pFile = NSFile::CFileBinary::OpenFileNative(wsFileName, L"rb");
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// Создаем поток
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Object oTemp;
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oTemp.InitNull();
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m_pStream = new FileStream(m_pFile, 0, false, 0, &oTemp);
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}
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else
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{
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DWORD lReadedSize;
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DWORD lTotallReadedSize = 0;
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DWORD lCounter = 0;
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while (lTotallReadedSize != lFileSize)
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{
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oFile.ReadFile(m_pFileBuffer + lTotallReadedSize, lFileSize - lTotallReadedSize, lReadedSize);
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lTotallReadedSize += lReadedSize;
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lCounter++;
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if (lCounter > 0x0FFFFFFF)
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{
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lTotallReadedSize = 0;
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break;
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}
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}
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oFile.CloseFile();
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if (lTotallReadedSize != lFileSize)
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{
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m_pFileBuffer = NULL;
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m_bValid = false;
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return;
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}
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// Создаем поток
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Object oTemp;
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oTemp.InitNull();
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m_pStream = new MemoryStream((char*)m_pFileBuffer, 0, lFileSize, &oTemp);
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}
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if (!m_pStream)
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m_bValid = false;
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m_bValid = Setup(seOwnerPassword, seUserPassword);
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}
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bool PDFDoc::Setup(StringExt *seOwnerPassword, StringExt *seUserPassword)
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{
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m_pStream->Reset();
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// Проверяем заголовок PDF файла
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CheckHeader();
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// Считываем таблицу Xref
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m_pXref = new XRef(m_pStream);
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if (!m_pXref->CheckValidate())
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{
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// TO DO: Error "Couldn't read xref table"
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m_eErrorCode = (EError)m_pXref->GetErrorCode();
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return false;
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}
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// Проверяем зашифрован ли документ
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if (!CheckEncryption(seOwnerPassword, seUserPassword))
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{
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m_eErrorCode = errorEncrypted;
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return false;
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}
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// Считываем объект Catalog
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m_pCatalog = new Catalog(m_pGlobalParams, m_pXref);
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if (!m_pCatalog->CheckValidation())
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{
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// TO DO: Error "Couldn't read page catalog"
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m_eErrorCode = errorBadCatalog;
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return false;
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}
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// Считываем объект Outline
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m_pOutline = new Outline(m_pCatalog->GetOutline(), m_pXref);
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return true;
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}
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PDFDoc::~PDFDoc()
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{
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if (m_pOutline)
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{
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delete m_pOutline;
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}
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if (m_pCatalog)
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{
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delete m_pCatalog;
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}
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if (m_pXref)
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{
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delete m_pXref;
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}
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if (m_pStream)
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{
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delete m_pStream;
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}
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if (m_pFileBuffer)
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{
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delete[] m_pFileBuffer;
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}
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if (m_pFile)
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{
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fclose(m_pFile);
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}
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}
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void PDFDoc::CheckHeader()
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{
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char hdrBuf[HeaderSearchSize + 1];
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char *p;
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int nIndex = 0;
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m_dPDFVersion = 0;
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for (nIndex = 0; nIndex < HeaderSearchSize; ++nIndex)
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{
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hdrBuf[nIndex] = m_pStream->GetChar();
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}
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hdrBuf[HeaderSearchSize] = '\0';
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for (nIndex = 0; nIndex < HeaderSearchSize - 5; ++nIndex)
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{
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if (!strncmp(&hdrBuf[nIndex], "%PDF-", 5))
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{
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break;
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}
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}
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if (nIndex >= HeaderSearchSize - 5)
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{
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// TO DO: Error "May not be a PDF file"
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return;
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}
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m_pStream->SetStartPos(nIndex);
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if (!(p = strtok(&hdrBuf[nIndex + 5], " \t\n\r")))
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{
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// TO DO: Error "May not be a PDF file"
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return;
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}
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m_dPDFVersion = atof(p);
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if (!(hdrBuf[nIndex + 5] >= '0' && hdrBuf[nIndex + 5] <= '9') || m_dPDFVersion > SupportedPDFVersionNum + 0.0001)
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{
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// TO DO: Error "Unsupported PDF version"
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}
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}
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bool PDFDoc::CheckEncryption(StringExt *ownerPassword, StringExt *userPassword)
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{
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bool bEncrypted = false;
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bool bResult = true;
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Object oEncypt;
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m_pXref->GetTrailerDict()->DictLookup("Encrypt", &oEncypt);
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if ((bEncrypted = oEncypt.IsDict()))
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{
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SecurityHandler *pSecurityHandler = NULL;
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if ((pSecurityHandler = SecurityHandler::Make(this, &oEncypt)))
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{
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if (pSecurityHandler->CheckEncryption(ownerPassword, userPassword))
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{
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// Авторизация пройдена
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m_pXref->SetEncryption(pSecurityHandler->GetPermissionFlags(), pSecurityHandler->GetOwnerPasswordValid(), pSecurityHandler->GetFileKey(), pSecurityHandler->GetFileKeyLength(), pSecurityHandler->GetEncodingVersion(), pSecurityHandler->GetEncodingAlgorithm());
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bResult = true;
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}
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else
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{
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// Авторизация не пройдена
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bResult = false;
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}
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delete pSecurityHandler;
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}
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else
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{
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bResult = false;
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}
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}
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else
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{
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// Данный PDF файл не зашифрован
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bResult = true;
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}
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oEncypt.Free();
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return bResult;
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}
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void PDFDoc::DisplayPage(OutputDev *pOut, int nPageIndex, double dHorDPI, double dVerDPI, int nRotate, bool bUseMediaBox, bool bCrop, bool bPrinting, bool(*pAbortCheckCbk)(void *pData), void *pAbortCheckCbkData)
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{
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m_pCatalog->GetPage(nPageIndex)->Display(pOut, dHorDPI, dVerDPI, nRotate, bUseMediaBox, bCrop, bPrinting, m_pCatalog, pAbortCheckCbk, pAbortCheckCbkData);
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}
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void PDFDoc::DisplayPages(OutputDev *pOut, int nFirstPageIndex, int nLastPageIndex, double dHorDPI, double dVerDPI, int nRotate, bool bUseMediaBox, bool bCrop, bool bPrinting, bool(*pAbortCheckCbk)(void *pData), void *pAbortCheckCbkData)
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{
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for (int nPageIndex = nFirstPageIndex; nPageIndex <= nLastPageIndex; ++nPageIndex)
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{
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DisplayPage(pOut, nPageIndex, dHorDPI, dVerDPI, nRotate, bUseMediaBox, bCrop, bPrinting, pAbortCheckCbk, pAbortCheckCbkData);
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}
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}
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void PDFDoc::DisplayPageSlice(OutputDev *pOut, int nPageIndex, double dHorDPI, double dVerDPI, int nRotate, bool bUseMediaBox, bool bCrop, bool bPrinting, int nSliceX, int nSliceY, int nSliceW, int nSliceH, bool(*pAbortCheckCbk)(void *pData), void *pAbortCheckCbkData)
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{
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m_pCatalog->GetPage(nPageIndex)->DisplaySlice(pOut, dHorDPI, dVerDPI, nRotate, bUseMediaBox, bCrop, nSliceX, nSliceY, nSliceW, nSliceH, bPrinting, m_pCatalog, pAbortCheckCbk, pAbortCheckCbkData);
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}
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Links *PDFDoc::GetLinks(int nPageIndex)
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{
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return m_pCatalog->GetPage(nPageIndex)->GetLinks(m_pCatalog);
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}
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void PDFDoc::ProcessLinks(OutputDev *pOut, int nPageIndex)
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{
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m_pCatalog->GetPage(nPageIndex)->ProcessLinks(pOut, m_pCatalog);
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}
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bool PDFDoc::IsLinearized()
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{
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bool bLinearized = false;
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Object oTemp;
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oTemp.InitNull();
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Parser *pParser = new Parser(m_pXref, new Lexer(m_pXref, m_pStream->MakeSubStream(m_pStream->GetStartPos(), false, 0, &oTemp)), true);
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if (!pParser)
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{
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// TO DO: Error "Can't allocate memory"
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oTemp.Free();
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return false;
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}
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oTemp.Free();
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Object oNum, oGen, oObj, oDict;
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pParser->GetObject(&oNum);
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pParser->GetObject(&oGen);
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pParser->GetObject(&oObj);
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pParser->GetObject(&oDict);
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if (oNum.IsInt() && oGen.IsInt() && oObj.IsCommand("obj") && oDict.IsDict())
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{
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Object oVersion;
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oDict.DictLookup("Linearized", &oVersion);
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if (oVersion.IsNum() && oVersion.GetNum() > 0)
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{
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bLinearized = true;
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}
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oVersion.Free();
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}
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oDict.Free();
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oObj.Free();
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oGen.Free();
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oNum.Free();
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delete pParser;
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return bLinearized;
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}
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} |