Portability issues: off_t, unlink

New header qpdf/Types.h attempts to make sure size_t and off_t are
defined on any platform and in a way that would work with large file
support.  Additionally, missing header files are included to get
unlink.

examples/pdf-mod-info.cc

@@ -8,6 +8,13 @@
 #include <iostream>
 #include <string.h>
 #include <stdlib.h>
+#ifdef _WIN32
+#include <Windows.h>
+#include <direct.h>
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
 
 static char const* version = "1.1";
 static char const* whoami = 0;

include/qpdf/QPDF.hh

@@ -15,6 +15,7 @@
 #include <iostream>
 
 #include <qpdf/DLL.h>
+#include <qpdf/Types.h>
 
 #include <qpdf/QPDFXRefEntry.hh>
 #include <qpdf/QPDFObjectHandle.hh>

include/qpdf/QPDFExc.hh

@@ -10,6 +10,7 @@
 
 #include <qpdf/DLL.h>
 #include <qpdf/Constants.h>
+#include <qpdf/Types.h>
 #include <stdexcept>
 
 class QPDFExc: public std::runtime_error

include/qpdf/QPDFObjectHandle.hh

@@ -14,6 +14,7 @@
 #include <map>
 
 #include <qpdf/DLL.h>
+#include <qpdf/Types.h>
 
 #include <qpdf/PointerHolder.hh>
 #include <qpdf/Buffer.hh>

include/qpdf/QPDFXRefEntry.hh

@@ -9,6 +9,7 @@
 #define __QPDFXREFENTRY_HH__
 
 #include <qpdf/DLL.h>
+#include <qpdf/Types.h>
 
 class QPDFXRefEntry
 {

include/qpdf/Types.h

@@ -0,0 +1,16 @@
+#ifndef __QPDFTYPES_H__
+#define __QPDFTYPES_H__
+
+/* Attempt to provide off_t and size_t on any recent platform.  To
+ * make cross compilation easier and to be more portable across
+ * platforms, QPDF avoids having any public header files use the
+ * results of autoconf testing, so we have to handle this ourselves in
+ * a static way.
+ */
+
+#define _FILE_OFFSET_BITS 64
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+
+#endif /* __QPDFTYPES_H__ */