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//========================================================================
//
// PDFDoc.cc
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#ifdef _WIN32
# include <windows.h>
#endif
#include "gmempp.h"
#include "GString.h"
#include "gfile.h"
#include "config.h"
#include "GlobalParams.h"
#include "Page.h"
#include "Catalog.h"
#include "Stream.h"
#include "XRef.h"
#include "Link.h"
#include "OutputDev.h"
#include "Error.h"
#include "ErrorCodes.h"
#include "Lexer.h"
#include "Parser.h"
#include "SecurityHandler.h"
#include "UTF8.h"
#ifndef DISABLE_OUTLINE
#include "Outline.h"
#endif
#include "OptionalContent.h"
#include "PDFDoc.h"
//------------------------------------------------------------------------
#define headerSearchSize 1024 // read this many bytes at beginning of
// file to look for '%PDF'
// Avoid sharing files with child processes on Windows, where sharing
// can cause problems.
#ifdef _WIN32
# define fopenReadMode "rbN"
# define wfopenReadMode L"rbN"
#else
# define fopenReadMode "rb"
#endif
//------------------------------------------------------------------------
// PDFDoc
//------------------------------------------------------------------------
PDFDoc::PDFDoc(GString *fileNameA, GString *ownerPassword,
GString *userPassword, PDFCore *coreA) {
Object obj;
GString *fileName1, *fileName2;
#ifdef _WIN32
int n, i;
#endif
init(coreA);
fileName = fileNameA;
#ifdef _WIN32
n = fileName->getLength();
fileNameU = (wchar_t *)gmallocn(n + 1, sizeof(wchar_t));
for (i = 0; i < n; ++i) {
fileNameU[i] = (wchar_t)(fileName->getChar(i) & 0xff);
}
fileNameU[n] = L'\0';
#endif
fileName1 = fileName;
// try to open file
fileName2 = NULL;
#ifdef VMS
if (!(file = fopen(fileName1->getCString(), fopenReadMode, "ctx=stm"))) {
error(errIO, -1, "Couldn't open file '{0:t}'", fileName1);
errCode = errOpenFile;
return;
}
#else
if (!(file = fopen(fileName1->getCString(), fopenReadMode))) {
fileName2 = fileName->copy();
fileName2->lowerCase();
if (!(file = fopen(fileName2->getCString(), fopenReadMode))) {
fileName2->upperCase();
if (!(file = fopen(fileName2->getCString(), fopenReadMode))) {
error(errIO, -1, "Couldn't open file '{0:t}'", fileName);
delete fileName2;
errCode = errOpenFile;
return;
}
}
delete fileName2;
}
#endif
// create stream
obj.initNull();
str = new FileStream(file, 0, gFalse, 0, &obj);
ok = setup(ownerPassword, userPassword);
}
#if 0
#ifdef _WIN32
PDFDoc::PDFDoc(wchar_t *fileNameA, int fileNameLen, GString *ownerPassword,
GString *userPassword, PDFCore *coreA) {
OSVERSIONINFO version;
Object obj;
int i;
init(coreA);
// handle a Windows shortcut
wchar_t wPath[MAX_PATH + 1];
int n = fileNameLen < MAX_PATH ? fileNameLen : MAX_PATH;
memcpy(wPath, fileNameA, n * sizeof(wchar_t));
wPath[n] = L'\0';
readWindowsShortcut(wPath, MAX_PATH + 1);
int wPathLen = (int)wcslen(wPath);
// save both Unicode and 8-bit copies of the file name
fileName = new GString();
fileNameU = (wchar_t *)gmallocn(wPathLen + 1, sizeof(wchar_t));
memcpy(fileNameU, wPath, (wPathLen + 1) * sizeof(wchar_t));
for (i = 0; i < wPathLen; ++i) {
fileName->append((char)fileNameA[i]);
}
// try to open file
// NB: _wfopen is only available in NT
version.dwOSVersionInfoSize = sizeof(version);
GetVersionEx(&version);
if (version.dwPlatformId == VER_PLATFORM_WIN32_NT) {
file = _wfopen(fileNameU, wfopenReadMode);
} else {
file = fopen(fileName->getCString(), fopenReadMode);
}
if (!file) {
error(errIO, -1, "Couldn't open file '{0:t}'", fileName);
errCode = errOpenFile;
return;
}
// create stream
obj.initNull();
str = new FileStream(file, 0, gFalse, 0, &obj);
ok = setup(ownerPassword, userPassword);
}
#endif
#endif /* 0 */
PDFDoc::PDFDoc(char *fileNameA, GString *ownerPassword,
GString *userPassword, PDFCore *coreA) {
/*
#ifdef _WIN32
OSVERSIONINFO version;
#endif
*/
Object obj;
/*
#ifdef _WIN32
Unicode u;
int i, j;
#endif
*/
init(coreA);
fileName = new GString(fileNameA);
#if defined(_WIN32)
#if 0
wchar_t wPath[MAX_PATH + 1];
i = 0;
j = 0;
while (j < MAX_PATH && getUTF8(fileName, &i, &u)) {
wPath[j++] = (wchar_t)u;
}
wPath[j] = L'\0';
readWindowsShortcut(wPath, MAX_PATH + 1);
int wPathLen = (int)wcslen(wPath);
fileNameU = (wchar_t *)gmallocn(wPathLen + 1, sizeof(wchar_t));
memcpy(fileNameU, wPath, (wPathLen + 1) * sizeof(wchar_t));
// NB: _wfopen is only available in NT
version.dwOSVersionInfoSize = sizeof(version);
GetVersionEx(&version);
if (version.dwPlatformId == VER_PLATFORM_WIN32_NT) {
file = _wfopen(fileNameU, wfopenReadMode);
} else {
#endif /* 0 */
file = fopen(fileName->getCString(), fopenReadMode);
#if 0
}
#endif /* 0 */
#elif defined(VMS)
file = fopen(fileName->getCString(), fopenReadMode, "ctx=stm");
#else
file = fopen(fileName->getCString(), fopenReadMode);
#endif
if (!file) {
error(errIO, -1, "Couldn't open file '{0:t}'", fileName);
errCode = errOpenFile;
return;
}
// create stream
obj.initNull();
str = new FileStream(file, 0, gFalse, 0, &obj);
ok = setup(ownerPassword, userPassword);
}
PDFDoc::PDFDoc(BaseStream *strA, GString *ownerPassword,
GString *userPassword, PDFCore *coreA) {
#ifdef _WIN32
int n, i;
#endif
init(coreA);
if (strA->getFileName()) {
fileName = strA->getFileName()->copy();
#ifdef _WIN32
n = fileName->getLength();
fileNameU = (wchar_t *)gmallocn(n + 1, sizeof(wchar_t));
for (i = 0; i < n; ++i) {
fileNameU[i] = (wchar_t)(fileName->getChar(i) & 0xff);
}
fileNameU[n] = L'\0';
#endif
} else {
fileName = NULL;
#ifdef _WIN32
fileNameU = NULL;
#endif
}
str = strA;
ok = setup(ownerPassword, userPassword);
}
void PDFDoc::init(PDFCore *coreA) {
ok = gFalse;
errCode = errNone;
core = coreA;
file = NULL;
str = NULL;
xref = NULL;
catalog = NULL;
#ifndef DISABLE_OUTLINE
outline = NULL;
#endif
optContent = NULL;
}
GBool PDFDoc::setup(GString *ownerPassword, GString *userPassword) {
str->reset();
// check header
checkHeader();
// read the xref and catalog
if (!PDFDoc::setup2(ownerPassword, userPassword, gFalse)) {
if (errCode == errDamaged || errCode == errBadCatalog) {
// try repairing the xref table
error(errSyntaxWarning, -1,
"PDF file is damaged - attempting to reconstruct xref table...");
if (!PDFDoc::setup2(ownerPassword, userPassword, gTrue)) {
return gFalse;
}
} else {
return gFalse;
}
}
#ifndef DISABLE_OUTLINE
// read outline
outline = new Outline(catalog->getOutline(), xref);
#endif
// read the optional content info
optContent = new OptionalContent(this);
// done
return gTrue;
}
GBool PDFDoc::setup2(GString *ownerPassword, GString *userPassword,
GBool repairXRef) {
// read xref table
xref = new XRef(str, repairXRef);
if (!xref->isOk()) {
error(errSyntaxError, -1, "Couldn't read xref table");
errCode = xref->getErrorCode();
delete xref;
xref = NULL;
return gFalse;
}
// check for encryption
if (!checkEncryption(ownerPassword, userPassword)) {
errCode = errEncrypted;
delete xref;
xref = NULL;
return gFalse;
}
// read catalog
catalog = new Catalog(this);
if (!catalog->isOk()) {
error(errSyntaxError, -1, "Couldn't read page catalog");
errCode = errBadCatalog;
delete catalog;
catalog = NULL;
delete xref;
xref = NULL;
return gFalse;
}
return gTrue;
}
PDFDoc::~PDFDoc() {
if (optContent) {
delete optContent;
}
#ifndef DISABLE_OUTLINE
if (outline) {
delete outline;
}
#endif
if (catalog) {
delete catalog;
}
if (xref) {
delete xref;
}
if (str) {
delete str;
}
if (file) {
fclose(file);
}
if (fileName) {
delete fileName;
}
#ifdef _WIN32
if (fileNameU) {
gfree(fileNameU);
}
#endif
}
// Check for a PDF header on this stream. Skip past some garbage
// if necessary.
void PDFDoc::checkHeader() {
char hdrBuf[headerSearchSize+1];
char *p;
int i;
pdfVersion = 0;
memset(hdrBuf, 0, headerSearchSize + 1);
str->getBlock(hdrBuf, headerSearchSize);
for (i = 0; i < headerSearchSize - 5; ++i) {
if (!strncmp(&hdrBuf[i], "%PDF-", 5)) {
break;
}
}
if (i >= headerSearchSize - 5) {
error(errSyntaxWarning, -1, "May not be a PDF file (continuing anyway)");
return;
}
str->moveStart(i);
if (!(p = strtok(&hdrBuf[i+5], " \t\n\r"))) {
error(errSyntaxWarning, -1, "May not be a PDF file (continuing anyway)");
return;
}
pdfVersion = atof(p);
if (!(hdrBuf[i+5] >= '0' && hdrBuf[i+5] <= '9') ||
pdfVersion > supportedPDFVersionNum + 0.0001) {
error(errSyntaxWarning, -1,
"PDF version {0:s} -- xpdf supports version {1:s} (continuing anyway)",
p, supportedPDFVersionStr);
}
}
GBool PDFDoc::checkEncryption(GString *ownerPassword, GString *userPassword) {
Object encrypt;
GBool encrypted;
SecurityHandler *secHdlr;
GBool ret;
xref->getTrailerDict()->dictLookup("Encrypt", &encrypt);
if ((encrypted = encrypt.isDict())) {
if ((secHdlr = SecurityHandler::make(this, &encrypt))) {
if (secHdlr->isUnencrypted()) {
// no encryption
ret = gTrue;
} else if (secHdlr->checkEncryption(ownerPassword, userPassword)) {
// authorization succeeded
xref->setEncryption(secHdlr->getPermissionFlags(),
secHdlr->getOwnerPasswordOk(),
secHdlr->getFileKey(),
secHdlr->getFileKeyLength(),
secHdlr->getEncVersion(),
secHdlr->getEncAlgorithm());
ret = gTrue;
} else {
// authorization failed
ret = gFalse;
}
delete secHdlr;
} else {
// couldn't find the matching security handler
ret = gFalse;
}
} else {
// document is not encrypted
ret = gTrue;
}
encrypt.free();
return ret;
}
void PDFDoc::displayPage(OutputDev *out, int page,
double hDPI, double vDPI, int rotate,
GBool useMediaBox, GBool crop, GBool printing,
GBool (*abortCheckCbk)(void *data),
void *abortCheckCbkData) {
if (globalParams->getPrintCommands()) {
printf("***** page %d *****\n", page);
}
catalog->getPage(page)->display(out, hDPI, vDPI,
rotate, useMediaBox, crop, printing,
abortCheckCbk, abortCheckCbkData);
}
void PDFDoc::displayPages(OutputDev *out, int firstPage, int lastPage,
double hDPI, double vDPI, int rotate,
GBool useMediaBox, GBool crop, GBool printing,
GBool (*abortCheckCbk)(void *data),
void *abortCheckCbkData) {
int page;
for (page = firstPage; page <= lastPage; ++page) {
displayPage(out, page, hDPI, vDPI, rotate, useMediaBox, crop, printing,
abortCheckCbk, abortCheckCbkData);
catalog->doneWithPage(page);
}
}
void PDFDoc::displayPageSlice(OutputDev *out, int page,
double hDPI, double vDPI, int rotate,
GBool useMediaBox, GBool crop, GBool printing,
int sliceX, int sliceY, int sliceW, int sliceH,
GBool (*abortCheckCbk)(void *data),
void *abortCheckCbkData) {
catalog->getPage(page)->displaySlice(out, hDPI, vDPI,
rotate, useMediaBox, crop,
sliceX, sliceY, sliceW, sliceH,
printing,
abortCheckCbk, abortCheckCbkData);
}
Links *PDFDoc::getLinks(int page) {
return catalog->getPage(page)->getLinks();
}
void PDFDoc::processLinks(OutputDev *out, int page) {
catalog->getPage(page)->processLinks(out);
}
#ifndef DISABLE_OUTLINE
int PDFDoc::getOutlineTargetPage(OutlineItem *outlineItem) {
LinkAction *action;
LinkActionKind kind;
LinkDest *dest;
GString *namedDest;
Ref pageRef;
int pg;
if (outlineItem->pageNum >= 0) {
return outlineItem->pageNum;
}
if (!(action = outlineItem->getAction())) {
outlineItem->pageNum = 0;
return 0;
}
kind = action->getKind();
if (kind != actionGoTo) {
outlineItem->pageNum = 0;
return 0;
}
if ((dest = ((LinkGoTo *)action)->getDest())) {
dest = dest->copy();
} else if ((namedDest = ((LinkGoTo *)action)->getNamedDest())) {
dest = findDest(namedDest);
}
pg = 0;
if (dest) {
if (dest->isPageRef()) {
pageRef = dest->getPageRef();
pg = findPage(pageRef.num, pageRef.gen);
} else {
pg = dest->getPageNum();
}
delete dest;
}
outlineItem->pageNum = pg;
return pg;
}
#endif
GBool PDFDoc::isLinearized() {
Parser *parser;
Object obj1, obj2, obj3, obj4, obj5;
GBool lin;
lin = gFalse;
obj1.initNull();
parser = new Parser(xref,
new Lexer(xref,
str->makeSubStream(str->getStart(), gFalse, 0, &obj1)),
gTrue);
parser->getObj(&obj1);
parser->getObj(&obj2);
parser->getObj(&obj3);
parser->getObj(&obj4);
if (obj1.isInt() && obj2.isInt() && obj3.isCmd("obj") &&
obj4.isDict()) {
obj4.dictLookup("Linearized", &obj5);
if (obj5.isNum() && obj5.getNum() > 0) {
lin = gTrue;
}
obj5.free();
}
obj4.free();
obj3.free();
obj2.free();
obj1.free();
delete parser;
return lin;
}
GBool PDFDoc::saveAs(GString *name) {
FILE *f;
char buf[4096];
int n;
if (!(f = fopen(name->getCString(), "wb"))) {
error(errIO, -1, "Couldn't open file '{0:t}'", name);
return gFalse;
}
str->reset();
while ((n = str->getBlock(buf, sizeof(buf))) > 0) {
fwrite(buf, 1, n, f);
}
str->close();
fclose(f);
return gTrue;
}
GBool PDFDoc::saveEmbeddedFile(int idx, const char *path) {
FILE *f;
GBool ret;
if (!(f = fopen(path, "wb"))) {
return gFalse;
}
ret = saveEmbeddedFile2(idx, f);
fclose(f);
return ret;
}
GBool PDFDoc::saveEmbeddedFileU(int idx, const char *path) {
FILE *f;
GBool ret;
if (!(f = openFile(path, "wb"))) {
return gFalse;
}
ret = saveEmbeddedFile2(idx, f);
fclose(f);
return ret;
}
#ifdef _WIN32
GBool PDFDoc::saveEmbeddedFile(int idx, const wchar_t *path, int pathLen) {
FILE *f;
OSVERSIONINFO version;
wchar_t path2w[_MAX_PATH + 1];
char path2c[_MAX_PATH + 1];
int i;
GBool ret;
// NB: _wfopen is only available in NT
/*
version.dwOSVersionInfoSize = sizeof(version);
GetVersionEx(&version);
if (version.dwPlatformId == VER_PLATFORM_WIN32_NT) {
for (i = 0; i < pathLen && i < _MAX_PATH; ++i) {
path2w[i] = path[i];
}
path2w[i] = 0;
f = _wfopen(path2w, L"wb");
} else {
*/
for (i = 0; i < pathLen && i < _MAX_PATH; ++i) {
path2c[i] = (char)path[i];
}
path2c[i] = 0;
f = fopen(path2c, "wb");
/*
}
*/
if (!f) {
return gFalse;
}
ret = saveEmbeddedFile2(idx, f);
fclose(f);
return ret;
}
#endif
GBool PDFDoc::saveEmbeddedFile2(int idx, FILE *f) {
Object strObj;
char buf[4096];
int n;
if (!catalog->getEmbeddedFileStreamObj(idx, &strObj)) {
return gFalse;
}
strObj.streamReset();
while ((n = strObj.streamGetBlock(buf, sizeof(buf))) > 0) {
fwrite(buf, 1, n, f);
}
strObj.streamClose();
strObj.free();
return gTrue;
}
char *PDFDoc::getEmbeddedFileMem(int idx, int *size) {
Object strObj;
char *buf;
int bufSize, sizeInc, n;
if (!catalog->getEmbeddedFileStreamObj(idx, &strObj)) {
return NULL;
}
strObj.streamReset();
bufSize = 0;
buf = NULL;
do {
sizeInc = bufSize ? bufSize : 1024;
if (bufSize > INT_MAX - sizeInc) {
error(errIO, -1, "embedded file is too large");
*size = 0;
return NULL;
}
buf = (char *)grealloc(buf, bufSize + sizeInc);
n = strObj.streamGetBlock(buf + bufSize, sizeInc);
bufSize += n;
} while (n == sizeInc);
strObj.streamClose();
strObj.free();
*size = bufSize;
return buf;
}
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