Remove PCRE

Jay Berkenbilt
1 parent 30f109e2
Showing 18 changed files with 54 additions and 686 deletions
ChangeLog
README
README-what-to-download.txt
README-windows.txt
README.maintainer
TODO
configure.ac
ispell-words
libqpdf.pc.in
libqpdf/PCRE.cc
libqpdf/build.mk
libqpdf/qpdf/PCRE.hh
libtests/build.mk
libtests/pcre.cc
libtests/qtest/pcre.test
libtests/qtest/pcre/pcre-unicode-classes.out
libtests/qtest/pcre/pcre.out
manual/qpdf-manual.xml
 2017-08-10  Jay Berkenbilt  <ejb@ql.org>
  
+	* Remove dependency on libpcre.
+
 	* Be more forgiving of certain types of errors in the xref table
 	that don't interfere with interpreting the table.
  
@@ -13,11 +13,11 @@ warranty.
 Prerequisites
 =============
  
-QPDF depends on external libraries "zlib" and "pcre".  These are part
-of virtually all Linux distributions and are readily available;
-download information appears in the documentation.  For Windows, you
-can download pre-built binary versions of those libraries for some
-compilers; see README-windows.txt for additional details.
+QPDF depends on the external library "zlib". This are part of every
+Linux distribution and is readily available. Download information
+appears in the documentation. For Windows, you can download pre-built
+binary versions of this libraries for some compilers; see
+README-windows.txt for additional details.
  
 QPDF requires a C++ compiler that works with STL.  Your compiler must
 also support "long long".  Almost all modern compilers do.  If you are
@@ -34,10 +34,9 @@ you had an otherwise working qpdf.
 Licensing terms of embedded software
 ====================================
  
-QPDF makes use of zlib and pcre for its functionality.  These packages
-can be downloaded separately from their own download locations, or
-they can be downloaded in the external-libs area of the qpdf download
-site.
+QPDF makes use of zlib for its functionality. This package can be
+downloaded separately from its own download location, or it can be
+downloaded in the external-libs area of the qpdf download site.
  
 The Rijndael encryption implementation used as the basis for AES
 encryption and decryption support comes from Philip J. Erdelsky's
@@ -147,11 +146,11 @@ user&#39;s manual can be found in the &quot;doc&quot; directory.  The docbook
 sources to the user's manual can be found in the "manual" directory.
  
 The software library is just libqpdf, and all the header files are in
-the qpdf subdirectory.  If you link statically with -lqpdf, then you
-will also need to link with -lpcre and -lz.  The shared qpdf library
-is linked with -lpcre and -lz, and none of qpdf's public header files
-directly include files from pcre or libz, so in many cases, qpdf's
-development files are self contained.
+the qpdf subdirectory. If you link statically with -lqpdf, then you
+will also need to link with -lz. The shared qpdf library is linked
+with -lz, and none of qpdf's public header files directly include
+files from libz, so in many cases, qpdf's development files are self
+contained.
  
 To learn about using the library, please read comments in the header
 files in include/qpdf, especially QPDF.hh, QPDFObjectHandle.hh, and
@@ -46,9 +46,8 @@ download.
  * qpdf-external-libs-src.zip
  
    If you want to build the external libraries on your own (for
-   Windows or anything else), you can download this archive.  In
-   addition to including unmodified distributions of pcre and zlib, it
-   includes a README file and some scripts to help you build them for
-   Windows.
+   Windows or anything else), you can download this archive. In
+   addition to including an unmodified distribution zlib, it includes
+   a README file and some scripts to help you build it for Windows.
  
 If you want to build on Windows, please see also README-windows.txt.
@@ -84,29 +84,32 @@ installers are provided, they might do that already by default.
 External Libraries
 ==================
  
-In order to build qpdf, you must have copies of zlib and pcre.  The
-easy way to get them is to download them from the qpdf download area.
-There are packages called external-libs-bin.zip and
-external-libs-src.zip.  If you are building with MSVC 2010 or MINGW,
-you can just extract the qpdf-external-libs-bin.zip zip file into the
-top-level qpdf source tree.  Note that you need the 2012-06-20 version
-(at least) to build qpdf 3.0 or greater since this includes 64-bit
-libraries.  It will create a directory called external-libs which
-contains header files and precompiled libraries.  Passing
---enable-external-libs to ./configure (which is done automatically if
-you follow the instructions below) is sufficient to find them.
-
-You can also obtain pcre and zlib directly on your own and install
-them.  If you are using mingw, you can just set CPPFLAGS, LDFLAGS, and
-LIBS when you run ./configure so that it can find the header files and
-libraries.  If you are building with msvc and you want to do this, it
-probably won't work because ./configure doesn't know how to interpret
-LDFLAGS and LIBS properly for MSVC (though qpdf's own build system
-does).  In this case, you can probably get away with cheating by
-passing --enable-external-libs to ./configure and then just editing
-CPPFLAGS, LDFLAGS, LIBS in the generated autoconf.mk file.  Note that
-you should use UNIX-like syntax (-I, -L, -l) even though this is not
-what cl takes on the command line.  qpdf's build rules will fix it.
+In order to build qpdf, you must have a copy of zlib. The easy way to
+get it is to download it from the qpdf download area. There are
+packages called external-libs-bin.zip and external-libs-src.zip. If
+you are building with MSVC 2010 or MINGW, you can just extract the
+qpdf-external-libs-bin.zip zip file into the top-level qpdf source
+tree. Note that you need the 2012-06-20 version (at least) to build
+qpdf 3.0 or greater since this includes 64-bit libraries. The
+2017-08-10 version includes libraries built with MSVC 2015 and
+contains only zlib. Older versions also contain pcre, which is no
+longer required as of qpdf 7.0.0. Extracting the zip will create a
+directory called external-libs which contains header files and
+precompiled libraries. Passing --enable-external-libs to ./configure
+(which is done automatically if you follow the instructions below) is
+sufficient to find them.
+
+You can also obtain zlib directly on your own and install it. If you
+are using mingw, you can just set CPPFLAGS, LDFLAGS, and LIBS when you
+run ./configure so that it can find the header files and libraries. If
+you are building with msvc and you want to do this, it probably won't
+work because ./configure doesn't know how to interpret LDFLAGS and
+LIBS properly for MSVC (though qpdf's own build system does). In this
+case, you can probably get away with cheating by passing
+--enable-external-libs to ./configure and then just editing CPPFLAGS,
+LDFLAGS, LIBS in the generated autoconf.mk file. Note that you should
+use UNIX-like syntax (-I, -L, -l) even though this is not what cl
+takes on the command line. qpdf's build rules will fix it.
  
 You can also download qpdf-external-libs-src.zip and follow the
 instructions in the README.txt there for how to build external libs.
@@ -113,7 +113,12 @@ Release Reminders
    version control system into a directory called qpdf-external-libs
    and just make a zip file of the result called
    qpdf-external-libs-src.zip.  See the README.txt file there for
-   information on creating binary external libs releases.
+   information on creating binary external libs releases. Run this
+   from the external-libs repository:
+
+   git archive --prefix=external-libs/ HEAD . | (cd /tmp; tar xf -)
+   cd /tmp
+   zip -r qpdf-external-libs-src.zip external-libs
  
  * To create Windows binary releases, extract the qpdf source
    distribution in Windows (MSYS + MINGW, MSVC).  From the extracted
@@ -7,9 +7,6 @@ version if needed.
 Soon
 ====
  
- * Eliminate dependency on PCRE. There aren't that many regular
-   expressions, and they are used only for internal purposes.
-
  * Consider whether there should be a mode in which QPDFObjectHandle
    returns nulls for operations on the wrong type instead of asserting
    the type. The way things are wired up now, this would have to be a
@@ -82,8 +82,6 @@ fi
 if test "$BUILD_INTERNAL_LIBS" = "0"; then
    AC_CHECK_HEADER(zlib.h,,[MISSING_ZLIB_H=1; MISSING_ANY=1])
    AC_SEARCH_LIBS(deflate,z zlib,,[MISSING_ZLIB=1; MISSING_ANY=1])
-   AC_CHECK_HEADER(pcre.h,,[MISSING_PCRE_H=1; MISSING_ANY=1])
-   AC_SEARCH_LIBS(pcre_compile,pcre,,[MISSING_PCRE=1; MISSING_ANY=1])
 fi
  
 if test "x$qpdf_OS_SECURE_RANDOM" = "x1"; then
@@ -453,14 +451,6 @@ if test &quot;$MISSING_ZLIB&quot; = &quot;1&quot;; then
   AC_MSG_WARN(unable to find required library z (or zlib))
 fi
  
-if test "$MISSING_PCRE_H" = "1"; then
-  AC_MSG_WARN(unable to find required header pcre.h)
-fi
-
-if test "$MISSING_PCRE" = "1"; then
-  AC_MSG_WARN(unable to find required library pcre)
-fi
-
 if test "$MISSING_DOCBOOK_FO" = "1"; then
   AC_MSG_WARN(docbook fo stylesheets are required to build PDF documentation)
 fi
@@ -497,7 +487,7 @@ if test &quot;$USE_EXTERNAL_LIBS&quot; = &quot;1&quot;; then
    # much trouble getting it to work with a different compiler.
    CPPFLAGS="$CPPFLAGS -Iexternal-libs/include"
    LDFLAGS="$LDFLAGS -Lexternal-libs/lib-$BUILDRULES$WINDOWS_WORDSIZE"
-   LIBS="$LIBS -lz -lpcre"
+   LIBS="$LIBS -lz"
 fi
  
 AC_OUTPUT
@@ -727,7 +727,6 @@ lld
 lookup
 lossy
 LowPart
-lpcre
 lqpdf
 lsb
 lt
@@ -914,7 +913,6 @@ pb
 pbytes
 pc
 pcre
-pcreapi
 pdf
 PDFâ
 PDFContext
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: libqpdf
 Description: PDF transformation library
 Version: @PACKAGE_VERSION@
-Requires.private: zlib, libpcre
+Requires.private: zlib
 Libs: -L${libdir} -lqpdf
 Cflags: -I${includedir}
-#include <qpdf/PCRE.hh>
-#include <qpdf/QUtil.hh>
-
-#include <stdexcept>
-#include <iostream>
-#include <string.h>
-
-PCRE::NoBackref::NoBackref() :
-    std::logic_error("PCRE error: no match")
-{
-}
-
-PCRE::Match::Match(int nbackrefs, char const* subject)
-{
-    this->init(-1, nbackrefs, subject);
-}
-
-PCRE::Match::~Match()
-{
-    this->destroy();
-}
-
-PCRE::Match::Match(Match const& rhs)
-{
-    this->copy(rhs);
-}
-
-PCRE::Match&
-PCRE::Match::operator=(Match const& rhs)
-{
-    if (this != &rhs)
-    {
-	this->destroy();
-	this->copy(rhs);
-    }
-    return *this;
-}
-
-void
-PCRE::Match::init(int nmatches, int nbackrefs, char const* subject)
-{
-    this->nmatches = nmatches;
-    this->nbackrefs = nbackrefs;
-    this->subject = subject;
-    this->ovecsize = 3 * (1 + nbackrefs);
-    this->ovector = 0;
-    if (this->ovecsize)
-    {
-	this->ovector = new int[this->ovecsize];
-    }
-}
-
-void
-PCRE::Match::copy(Match const& rhs)
-{
-    this->init(rhs.nmatches, rhs.nbackrefs, rhs.subject);
-    int i;
-    for (i = 0; i < this->ovecsize; ++i)
-    {
-	this->ovector[i] = rhs.ovector[i];
-    }
-}
-
-void
-PCRE::Match::destroy()
-{
-    delete [] this->ovector;
-}
-
-PCRE::Match::operator bool()
-{
-    return (this->nmatches >= 0);
-}
-
-std::string
-PCRE::Match::getMatch(int n, int flags)
-{
-    // This method used to be implemented in terms of
-    // pcre_get_substring, but that function gives you an empty string
-    // for an unmatched backreference that is in range.
-
-    int offset;
-    int length;
-    try
-    {
-	getOffsetLength(n, offset, length);
-    }
-    catch (NoBackref&)
-    {
-	if (flags & gm_no_substring_returns_empty)
-	{
-	    return "";
-	}
-	else
-	{
-	    throw;
-	}
-    }
-
-    return std::string(this->subject).substr(offset, length);
-}
-
-void
-PCRE::Match::getOffsetLength(int n, int& offset, int& length)
-{
-    if ((this->nmatches < 0) ||
-	(n > this->nmatches - 1) ||
-	(this->ovector[n * 2] == -1))
-    {
-	throw NoBackref();
-    }
-    offset = this->ovector[n * 2];
-    length = this->ovector[n * 2 + 1] - offset;
-}
-
-int
-PCRE::Match::getOffset(int n)
-{
-    int offset;
-    int length;
-    this->getOffsetLength(n, offset, length);
-    return offset;
-}
-
-int
-PCRE::Match::getLength(int n)
-{
-    int offset;
-    int length;
-    this->getOffsetLength(n, offset, length);
-    return length;
-}
-
-int
-PCRE::Match::nMatches() const
-{
-    return this->nmatches;
-}
-
-PCRE::PCRE(char const* pattern, int options)
-{
-    char const *errptr;
-    int erroffset;
-    this->code = pcre_compile(pattern, options, &errptr, &erroffset, 0);
-    if (this->code)
-    {
-	pcre_fullinfo(this->code, 0, PCRE_INFO_CAPTURECOUNT, &(this->nbackrefs));
-    }
-    else
-    {
-	std::string message = (std::string("compilation of ") + pattern +
-			  " failed at offset " +
-			  QUtil::int_to_string(erroffset) + ": " +
-			  errptr);
-	throw std::runtime_error("PCRE error: " + message);
-    }
-}
-
-PCRE::~PCRE()
-{
-    pcre_free(this->code);
-}
-
-PCRE::Match
-PCRE::match(char const* subject, int options, int startoffset, int size)
-{
-    if (size == -1)
-    {
-	size = strlen(subject);
-    }
-
-    Match result(this->nbackrefs, subject);
-    int status = pcre_exec(this->code, 0, subject, size,
-			   startoffset, options,
-			   result.ovector, result.ovecsize);
-    if (status >= 0)
-    {
-	result.nmatches = status;
-    }
-    else
-    {
-	std::string message;
-
-	switch (status)
-	{
-	  case PCRE_ERROR_NOMATCH:
-	    break;
-
-	  case PCRE_ERROR_BADOPTION:
-	    message = "bad option passed to PCRE::match()";
-	    throw std::logic_error(message);
-	    break;
-
-	  case PCRE_ERROR_NOMEMORY:
-	    message = "insufficient memory";
-	    throw std::runtime_error(message);
-	    break;
-
-	  case PCRE_ERROR_NULL:
-	  case PCRE_ERROR_BADMAGIC:
-	  case PCRE_ERROR_UNKNOWN_NODE:
-	  default:
-	    message = "pcre_exec returned " + QUtil::int_to_string(status);
-	    throw std::logic_error(message);
-	}
-    }
-
-    return result;
-}
-
-void
-PCRE::test(int n)
-{
-    try
-    {
-	if (n == 1)
-	{
-	    static char const* utf8 = "abπdefq";
-	    PCRE u1("^([[:alpha:]]+)");
-	    PCRE u2("^([\\p{L}]+)", PCRE_UTF8);
-	    PCRE::Match m1 = u1.match(utf8);
-	    if (m1)
-	    {
-		std::cout << "no utf8: " << m1.getMatch(1) << std::endl;
-	    }
-	    PCRE::Match m2 = u2.match(utf8);
-	    if (m2)
-	    {
-		std::cout << "utf8: " << m2.getMatch(1) << std::endl;
-	    }
-	    return;
-	}
-
-	try
-	{
-	    PCRE pcre1("a**");
-	}
-	catch (std::exception& e)
-	{
-	    std::cout << e.what() << std::endl;
-	}
-
-	PCRE pcre2("^([^\\s:]*)\\s*:\\s*(.*?)\\s*$");
-	PCRE::Match m2 = pcre2.match("key: value one two three ");
-	if (m2)
-	{
-	    std::cout << m2.nMatches() << std::endl;
-	    std::cout << m2.getMatch(0) << std::endl;
-	    std::cout << m2.getOffset(0) << std::endl;
-	    std::cout << m2.getLength(0) << std::endl;
-	    std::cout << m2.getMatch(1) << std::endl;
-	    std::cout << m2.getOffset(1) << std::endl;
-	    std::cout << m2.getLength(1) << std::endl;
-	    std::cout << m2.getMatch(2) << std::endl;
-	    std::cout << m2.getOffset(2) << std::endl;
-	    std::cout << m2.getLength(2) << std::endl;
-	    try
-	    {
-		std::cout << m2.getMatch(3) << std::endl;
-	    }
-	    catch (std::exception& e)
-	    {
-		std::cout << e.what() << std::endl;
-	    }
-	    try
-	    {
-		std::cout << m2.getOffset(3) << std::endl;
-	    }
-	    catch (std::exception& e)
-	    {
-		std::cout << e.what() << std::endl;
-	    }
-	}
-	PCRE pcre3("^(a+)(b+)?$");
-	PCRE::Match m3 = pcre3.match("aaa");
-	try
-	{
-	    if (m3)
-	    {
-		std::cout << m3.nMatches() << std::endl;
-		std::cout << m3.getMatch(0) << std::endl;
-		std::cout << m3.getMatch(1) << std::endl;
-		std::cout << "-"
-			  << m3.getMatch(
-			      2, Match::gm_no_substring_returns_empty)
-			  << "-" << std::endl;
-		std::cout << "hello" << std::endl;
-		std::cout << m3.getMatch(2) << std::endl;
-		std::cout << "can't see this" << std::endl;
-	    }
-	}
-	catch (std::exception& e)
-	{
-	    std::cout << e.what() << std::endl;
-	}
-
-	// backref: 1   2 3        4      5
-	PCRE pcre4("^((?:(a(b)?)(?:,(c))?)|(c))?$");
-	static char const* candidates[] = {
-	    "qqqcqqq",		// no match
-	    "ab,c",		// backrefs: 0, 1, 2, 3, 4
-	    "ab",		// backrefs: 0, 1, 2, 3
-	    "a",		// backrefs: 0, 1, 2
-	    "a,c",		// backrefs: 0, 1, 2, 4
-	    "c",		// backrefs: 0, 1, 5
-	    "",			// backrefs: 0
-	    0
-	};
-	for (char const** p = candidates; *p; ++p)
-	{
-	    PCRE::Match m(pcre4.match(*p));
-	    if (m)
-	    {
-		int nmatches = m.nMatches();
-		for (int i = 0; i < nmatches; ++i)
-		{
-		    std::cout << *p << ": " << i << ": ";
-		    try
-		    {
-			std::string match = m.getMatch(i);
-			std::cout << match;
-		    }
-		    catch (NoBackref&)
-		    {
-			std::cout << "no backref (getMatch)";
-		    }
-		    std::cout << std::endl;
-
-		    std::cout << *p << ": " << i << ": ";
-		    try
-		    {
-			int offset;
-			int length;
-			m.getOffsetLength(i, offset, length);
-			std::cout << offset << ", " << length;
-		    }
-		    catch (NoBackref&)
-		    {
-			std::cout << "no backref (getOffsetLength)";
-		    }
-		    std:: cout << std::endl;
-		}
-	    }
-	    else
-	    {
-		std::cout << *p << ": no match" << std::endl;
-	    }
-	}
-    }
-    catch (std::exception& e)
-    {
-	std::cout << "unexpected exception: " << e.what() << std::endl;
-    }
-}
@@ -14,7 +14,6 @@ SRCS_libqpdf = \
 	libqpdf/InsecureRandomDataProvider.cc \
 	libqpdf/MD5.cc \
 	libqpdf/OffsetInputSource.cc \
-	libqpdf/PCRE.cc \
 	libqpdf/Pipeline.cc \
 	libqpdf/Pl_AES_PDF.cc \
 	libqpdf/Pl_ASCII85Decoder.cc \
-// This is a C++ wrapper class around Philip Hazel's perl-compatible
-// regular expressions library.
-//
-
-#ifndef __PCRE_HH__
-#define __PCRE_HH__
-
-#include <qpdf/DLL.h>
-
-#ifdef _WIN32
-# define PCRE_STATIC
-#endif
-#include <pcre.h>
-#include <string>
-#include <stdexcept>
-
-// Note: this class does not encapsulate all features of the PCRE
-// package -- only those that I actually need right now are here.
-
-class PCRE
-{
-  public:
-    // This is thrown when an attempt is made to access a non-existent
-    // back reference.
-    class NoBackref: public std::logic_error
-    {
-      public:
-	QPDF_DLL
-	NoBackref();
-	virtual ~NoBackref() throw() {}
-    };
-
-    class Match
-    {
-	friend class PCRE;
-      public:
-	QPDF_DLL
-	Match(int nbackrefs, char const* subject);
-	QPDF_DLL
-	Match(Match const&);
-	QPDF_DLL
-	Match& operator=(Match const&);
-	QPDF_DLL
-	~Match();
-	QPDF_DLL
-	operator bool();
-
-	// All the back reference accessing routines may throw the
-	// special exception NoBackref (derived from Exception) if the
-	// back reference does not exist.  Exception will be thrown
-	// for other error conditions.  This allows callers to trap
-	// this condition explicitly when they care about the
-	// difference between a backreference matching an empty string
-	// and not matching at all.
-
-	// see getMatch flags below
-	QPDF_DLL
-	std::string getMatch(int n, int flags = 0);
-	QPDF_DLL
-	void getOffsetLength(int n, int& offset, int& length);
-	QPDF_DLL
-	int getOffset(int n);
-	QPDF_DLL
-	int getLength(int n);
-
-	// nMatches returns the number of available matches including
-	// match 0 which is the whole string.  In other words, if you
-	// have one backreference in your expression and the
-	// expression matches, nMatches() will return 2, getMatch(0)
-	// will return the whole string, getMatch(1) will return the
-	// text that matched the backreference, and getMatch(2) will
-	// throw an exception because it is out of range.
-	QPDF_DLL
-	int nMatches() const;
-
-	// Flags for getMatch
-
-	// getMatch on a substring that didn't match should return
-	// empty string instead of throwing an exception
-	static int const gm_no_substring_returns_empty = (1 << 0);
-
-      private:
-	void init(int nmatches, int nbackrefs, char const* subject);
-	void copy(Match const&);
-	void destroy();
-
-	int nbackrefs;
-	char const* subject;
-	int* ovector;
-	int ovecsize;
-	int nmatches;
-    };
-
-    // The value passed in as options is passed to pcre_exec.  See man
-    // pcreapi for details.
-    QPDF_DLL
-    PCRE(char const* pattern, int options = 0);
-    QPDF_DLL
-    ~PCRE();
-
-    QPDF_DLL
-    Match match(char const* subject, int options = 0, int startoffset = 0,
-		int size = -1);
-
-    QPDF_DLL
-    static void test(int n = 0);
-
-  private:
-    // prohibit copying and assignment
-    PCRE(PCRE const&);
-    PCRE& operator=(PCRE const&);
-
-    pcre* code;
-    int nbackrefs;
-};
-
-#endif // __PCRE_HH__
@@ -9,7 +9,6 @@ BINS_libtests = \
 	input_source \
 	lzw \
 	md5 \
-	pcre \
 	png_filter \
 	pointer_holder \
 	qutil \
-#include <qpdf/PCRE.hh>
-#include <iostream>
-#include <string.h>
-
-int main(int argc, char* argv[])
-{
-    if ((argc == 2) && (strcmp(argv[1], "--unicode-classes-supported") == 0))
-    {
-	try
-	{
-	    PCRE("^([\\p{L}]+)", PCRE_UTF8);
-	    std::cout << "1" << std::endl;
-	}
-	catch (std::exception&)
-	{
-	    std::cout << "0" << std::endl;
-	}
-	return 0;
-    }
-
-    if ((argc == 2) && (strcmp(argv[1], "--unicode-classes") == 0))
-    {
-	PCRE::test(1);
-    }
-    else
-    {
-	PCRE::test();
-    }
-    return 0;
-}
-#!/usr/bin/env perl
-require 5.008;
-BEGIN { $^W = 1; }
-use strict;
-
-chdir("pcre") or die "chdir testdir failed: $!\n";
-
-require TestDriver;
-
-my $td = new TestDriver('pcre');
-
-$td->runtest("PCRE",
-	     {$td->COMMAND => "pcre"},
-	     {$td->FILE => "pcre.out",
-	      $td->EXIT_STATUS => 0},
-	     $td->NORMALIZE_NEWLINES);
-
-chop(my $supported = `pcre --unicode-classes-supported`);
-if ($supported =~ m/^1/)
-{
-    my $xflags = 0;
-    if (`pcre --unicode-classes | wc -l` == 1)
-    {
-	# On Red Hat Enterprise Linux 5, the version of pcre provided
-	# by default claims to support unicode character classes, but
-	# they don't actually work.  Since qpdf doesn't use this
-	# functionality, we won't care if this particular test case
-	# fails.  If someone were to make general use of this wrapper,
-	# this test should be re-enabled, but on the other hand, they
-	# could just use the C++ interface that's been added to pcre
-	# since this code was written.
-	$xflags |= $td->EXPECT_FAILURE;
-    }
-    $td->runtest("unicode character classes",
-		 {$td->COMMAND => "pcre --unicode-classes"},
-		 {$td->FILE => "pcre-unicode-classes.out",
-		  $td->EXIT_STATUS => 0},
-		 $td->NORMALIZE_NEWLINES | $xflags);
-}
-else
-{
-    $td->runtest("unicode classes are not supported",
-		 {$td->STRING => "1"},
-		 {$td->STRING => "1"});
-}
-
-$td->report(2);
-no utf8: ab
-utf8: abπdefq
-PCRE error: compilation of a** failed at offset 2: nothing to repeat
-3
-key: value one two three 
-0
-25
-key
-0
-3
-value one two three
-5
-19
-PCRE error: no match
-PCRE error: no match
-2
-aaa
-aaa
---
-hello
-PCRE error: no match
-qqqcqqq: no match
-ab,c: 0: ab,c
-ab,c: 0: 0, 4
-ab,c: 1: ab,c
-ab,c: 1: 0, 4
-ab,c: 2: ab
-ab,c: 2: 0, 2
-ab,c: 3: b
-ab,c: 3: 1, 1
-ab,c: 4: c
-ab,c: 4: 3, 1
-ab: 0: ab
-ab: 0: 0, 2
-ab: 1: ab
-ab: 1: 0, 2
-ab: 2: ab
-ab: 2: 0, 2
-ab: 3: b
-ab: 3: 1, 1
-a: 0: a
-a: 0: 0, 1
-a: 1: a
-a: 1: 0, 1
-a: 2: a
-a: 2: 0, 1
-a,c: 0: a,c
-a,c: 0: 0, 3
-a,c: 1: a,c
-a,c: 1: 0, 3
-a,c: 2: a
-a,c: 2: 0, 1
-a,c: 3: no backref (getMatch)
-a,c: 3: no backref (getOffsetLength)
-a,c: 4: c
-a,c: 4: 2, 1
-c: 0: c
-c: 0: 0, 1
-c: 1: c
-c: 1: 0, 1
-c: 2: no backref (getMatch)
-c: 2: no backref (getOffsetLength)
-c: 3: no backref (getMatch)
-c: 3: no backref (getOffsetLength)
-c: 4: no backref (getMatch)
-c: 4: no backref (getOffsetLength)
-c: 5: c
-c: 5: 0, 1
-: 0: 
-: 0: 0, 0
@@ -93,7 +93,7 @@
   <sect1 id="ref.prerequisites">
    <title>System Requirements</title>
    <para>
-    The qpdf package has relatively few external dependencies.  In
+    The qpdf package has only one external dependencies.  In
     order to build qpdf, the following packages are required:
     <itemizedlist>
      <listitem>
@@ -103,11 +103,6 @@
      </listitem>
      <listitem>
       <para>
-       pcre: <ulink url="http://www.pcre.org/">http://www.pcre.org/</ulink>
-      </para>
-     </listitem>
-     <listitem>
-      <para>
        gnu make 3.81 or newer: <ulink url="http://www.gnu.org/software/make">http://www.gnu.org/software/make</ulink>
       </para>
      </listitem>
@@ -1466,7 +1461,7 @@ outfile.pdf&lt;/option&gt;
    </para>
    <para>
     When linking against the qpdf static library, you may also need to
-    specify <literal>-lpcre -lz</literal> on your link command.  If
+    specify <literal>-lz</literal> on your link command.  If
     your system understands how to read libtool
     <filename>.la</filename> files, this may not be necessary.
    </para>