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402 lines
9.2 KiB
402 lines
9.2 KiB
//========================================================================
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//
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// PDFDoc.cc
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//
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// Copyright 1996-2003 Glyph & Cog, LLC
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//
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//========================================================================
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#include <aconf.h>
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#ifdef USE_GCC_PRAGMAS
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#pragma implementation
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#endif
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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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#ifdef WIN32
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# include <windows.h>
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#endif
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#include "GString.h"
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#include "config.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 "OutputDev.h"
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#include "Error.h"
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#include "ErrorCodes.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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#ifndef DISABLE_OUTLINE
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#include "Outline.h"
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#endif
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#include "PDFDoc.h"
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//------------------------------------------------------------------------
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#define headerSearchSize 1024 // read this many bytes at beginning of
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// file to look for '%PDF'
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//------------------------------------------------------------------------
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// PDFDoc
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//------------------------------------------------------------------------
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PDFDoc::PDFDoc(GString *fileNameA, GString *ownerPassword,
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GString *userPassword, void *guiDataA) {
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Object obj;
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GString *fileName1, *fileName2;
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ok = gFalse;
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errCode = errNone;
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guiData = guiDataA;
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file = NULL;
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str = NULL;
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xref = NULL;
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catalog = NULL;
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#ifndef DISABLE_OUTLINE
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outline = NULL;
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#endif
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fileName = fileNameA;
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fileName1 = fileName;
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// try to open file
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fileName2 = NULL;
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#ifdef VMS
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if (!(file = fopen(fileName1->getCString(), "rb", "ctx=stm"))) {
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error(-1, "Couldn't open file '%s'", fileName1->getCString());
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errCode = errOpenFile;
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return;
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}
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#else
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if (!(file = fopen(fileName1->getCString(), "rb"))) {
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fileName2 = fileName->copy();
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fileName2->lowerCase();
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if (!(file = fopen(fileName2->getCString(), "rb"))) {
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fileName2->upperCase();
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if (!(file = fopen(fileName2->getCString(), "rb"))) {
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error(-1, "Couldn't open file '%s'", fileName->getCString());
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delete fileName2;
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errCode = errOpenFile;
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return;
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}
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}
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delete fileName2;
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}
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#endif
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// create stream
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obj.initNull();
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str = new FileStream(file, 0, gFalse, 0, &obj);
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ok = setup(ownerPassword, userPassword);
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}
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#ifdef WIN32
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PDFDoc::PDFDoc(wchar_t *fileNameA, int fileNameLen, GString *ownerPassword,
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GString *userPassword, void *guiDataA) {
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OSVERSIONINFO version;
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wchar_t fileName2[_MAX_PATH + 1];
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Object obj;
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int i;
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ok = gFalse;
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errCode = errNone;
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guiData = guiDataA;
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file = NULL;
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str = NULL;
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xref = NULL;
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catalog = NULL;
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#ifndef DISABLE_OUTLINE
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outline = NULL;
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#endif
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//~ file name should be stored in Unicode (?)
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fileName = new GString();
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for (i = 0; i < fileNameLen; ++i) {
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fileName->append((char)fileNameA[i]);
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}
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// zero-terminate the file name string
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for (i = 0; i < fileNameLen && i < _MAX_PATH; ++i) {
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fileName2[i] = fileNameA[i];
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}
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fileName2[i] = 0;
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// try to open file
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// NB: _wfopen is only available in NT
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version.dwOSVersionInfoSize = sizeof(version);
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GetVersionEx(&version);
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if (version.dwPlatformId == VER_PLATFORM_WIN32_NT) {
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file = _wfopen(fileName2, L"rb");
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} else {
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file = fopen(fileName->getCString(), "rb");
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}
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if (!file) {
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error(-1, "Couldn't open file '%s'", fileName->getCString());
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errCode = errOpenFile;
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return;
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}
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// create stream
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obj.initNull();
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str = new FileStream(file, 0, gFalse, 0, &obj);
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ok = setup(ownerPassword, userPassword);
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}
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#endif
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PDFDoc::PDFDoc(BaseStream *strA, GString *ownerPassword,
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GString *userPassword, void *guiDataA) {
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ok = gFalse;
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errCode = errNone;
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guiData = guiDataA;
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if (strA->getFileName()) {
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fileName = strA->getFileName()->copy();
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} else {
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fileName = NULL;
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}
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file = NULL;
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str = strA;
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xref = NULL;
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catalog = NULL;
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#ifndef DISABLE_OUTLINE
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outline = NULL;
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#endif
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ok = setup(ownerPassword, userPassword);
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}
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GBool PDFDoc::setup(GString *ownerPassword, GString *userPassword) {
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str->reset();
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// check header
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checkHeader();
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// read xref table
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xref = new XRef(str);
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if (!xref->isOk()) {
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error(-1, "Couldn't read xref table");
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errCode = xref->getErrorCode();
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return gFalse;
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}
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// check for encryption
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if (!checkEncryption(ownerPassword, userPassword)) {
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errCode = errEncrypted;
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return gFalse;
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}
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// read catalog
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catalog = new Catalog(xref);
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if (!catalog->isOk()) {
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error(-1, "Couldn't read page catalog");
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errCode = errBadCatalog;
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return gFalse;
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}
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#ifndef DISABLE_OUTLINE
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// read outline
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outline = new Outline(catalog->getOutline(), xref);
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#endif
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// done
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return gTrue;
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}
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PDFDoc::~PDFDoc() {
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#ifndef DISABLE_OUTLINE
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if (outline) {
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delete outline;
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}
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#endif
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if (catalog) {
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delete catalog;
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}
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if (xref) {
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delete xref;
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}
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if (str) {
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delete str;
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}
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if (file) {
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fclose(file);
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}
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if (fileName) {
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delete fileName;
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}
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}
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// Check for a PDF header on this stream. Skip past some garbage
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// if necessary.
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void PDFDoc::checkHeader() {
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char hdrBuf[headerSearchSize+1];
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char *p;
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int i;
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pdfVersion = 0;
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for (i = 0; i < headerSearchSize; ++i) {
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hdrBuf[i] = str->getChar();
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}
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hdrBuf[headerSearchSize] = '\0';
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for (i = 0; i < headerSearchSize - 5; ++i) {
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if (!strncmp(&hdrBuf[i], "%PDF-", 5)) {
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break;
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}
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}
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if (i >= headerSearchSize - 5) {
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error(-1, "May not be a PDF file (continuing anyway)");
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return;
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}
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str->moveStart(i);
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if (!(p = strtok(&hdrBuf[i+5], " \t\n\r"))) {
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error(-1, "May not be a PDF file (continuing anyway)");
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return;
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}
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pdfVersion = atof(p);
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if (!(hdrBuf[i+5] >= '0' && hdrBuf[i+5] <= '9') ||
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pdfVersion > supportedPDFVersionNum + 0.0001) {
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error(-1, "PDF version %s -- xpdf supports version %s"
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" (continuing anyway)", p, supportedPDFVersionStr);
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}
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}
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GBool PDFDoc::checkEncryption(GString *ownerPassword, GString *userPassword) {
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Object encrypt;
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GBool encrypted;
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SecurityHandler *secHdlr;
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GBool ret;
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xref->getTrailerDict()->dictLookup("Encrypt", &encrypt);
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if ((encrypted = encrypt.isDict())) {
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if ((secHdlr = SecurityHandler::make(this, &encrypt))) {
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if (secHdlr->checkEncryption(ownerPassword, userPassword)) {
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// authorization succeeded
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xref->setEncryption(secHdlr->getPermissionFlags(),
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secHdlr->getOwnerPasswordOk(),
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secHdlr->getFileKey(),
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secHdlr->getFileKeyLength(),
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secHdlr->getEncVersion(),
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secHdlr->getEncAlgorithm());
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ret = gTrue;
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} else {
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// authorization failed
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ret = gFalse;
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}
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delete secHdlr;
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} else {
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// couldn't find the matching security handler
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ret = gFalse;
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}
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} else {
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// document is not encrypted
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ret = gTrue;
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}
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encrypt.free();
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return ret;
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}
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void PDFDoc::displayPage(OutputDev *out, int page,
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double hDPI, double vDPI, int rotate,
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GBool useMediaBox, GBool crop, GBool printing,
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GBool (*abortCheckCbk)(void *data),
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void *abortCheckCbkData) {
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if (globalParams->getPrintCommands()) {
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printf("***** page %d *****\n", page);
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}
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catalog->getPage(page)->display(out, hDPI, vDPI,
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rotate, useMediaBox, crop, printing, catalog,
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abortCheckCbk, abortCheckCbkData);
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}
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void PDFDoc::displayPages(OutputDev *out, int firstPage, int lastPage,
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double hDPI, double vDPI, int rotate,
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GBool useMediaBox, GBool crop, GBool printing,
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GBool (*abortCheckCbk)(void *data),
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void *abortCheckCbkData) {
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int page;
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for (page = firstPage; page <= lastPage; ++page) {
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displayPage(out, page, hDPI, vDPI, rotate, useMediaBox, crop, printing,
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abortCheckCbk, abortCheckCbkData);
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}
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}
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void PDFDoc::displayPageSlice(OutputDev *out, int page,
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double hDPI, double vDPI, int rotate,
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GBool useMediaBox, GBool crop, GBool printing,
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int sliceX, int sliceY, int sliceW, int sliceH,
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GBool (*abortCheckCbk)(void *data),
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void *abortCheckCbkData) {
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catalog->getPage(page)->displaySlice(out, hDPI, vDPI,
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rotate, useMediaBox, crop,
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sliceX, sliceY, sliceW, sliceH,
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printing, catalog,
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abortCheckCbk, abortCheckCbkData);
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}
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Links *PDFDoc::getLinks(int page) {
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return catalog->getPage(page)->getLinks(catalog);
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}
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void PDFDoc::processLinks(OutputDev *out, int page) {
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catalog->getPage(page)->processLinks(out, catalog);
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}
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GBool PDFDoc::isLinearized() {
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Parser *parser;
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Object obj1, obj2, obj3, obj4, obj5;
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GBool lin;
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lin = gFalse;
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obj1.initNull();
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parser = new Parser(xref,
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new Lexer(xref,
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str->makeSubStream(str->getStart(), gFalse, 0, &obj1)),
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gTrue);
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parser->getObj(&obj1);
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parser->getObj(&obj2);
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parser->getObj(&obj3);
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parser->getObj(&obj4);
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if (obj1.isInt() && obj2.isInt() && obj3.isCmd("obj") &&
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obj4.isDict()) {
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obj4.dictLookup("Linearized", &obj5);
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if (obj5.isNum() && obj5.getNum() > 0) {
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lin = gTrue;
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}
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obj5.free();
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}
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obj4.free();
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obj3.free();
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obj2.free();
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obj1.free();
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delete parser;
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return lin;
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}
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GBool PDFDoc::saveAs(GString *name) {
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FILE *f;
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int c;
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if (!(f = fopen(name->getCString(), "wb"))) {
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error(-1, "Couldn't open file '%s'", name->getCString());
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return gFalse;
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}
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str->reset();
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while ((c = str->getChar()) != EOF) {
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fputc(c, f);
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}
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str->close();
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fclose(f);
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return gTrue;
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}
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