Make Visual Studio compiler happy.

added windows.h header for GetTempPathA

CHANGES.md

@@ -12,6 +12,10 @@ v1.1.2 (TBD)
 - Fixed an issue with PDF files produced by Crystal Reports (Issue #45)
 - Fixed an issue with PDF files produced by Microsoft Reporting Services
   (Issue #46)
+- Fixed support for compound filters where the filter array consists of a
+  single named filter (Issue #47)
+- Fixed builds on Windows - needed windows.h header for temporary files
+  (Issue #48)
 
 
 v1.1.1 (March 20, 2023)

pdfio-private.h

@@ -23,6 +23,7 @@
 #  ifdef _WIN32
 #    include <io.h>
 #    include <direct.h>
+#    include <windows.h> // GetTempPathA
 #    define access	_access		// Map standard POSIX/C99 names
 #    define close	_close
 #    define fileno	_fileno

pdfio-stream.c

@@ -464,11 +464,19 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
     // Try to decode/decompress the contents of this object...
     const char	*filter = pdfioDictGetName(dict, "Filter");
 					// Filter value
+    pdfio_array_t *fa = pdfioDictGetArray(dict, "Filter");
+					// Filter array
+
+    if (!filter && fa && pdfioArrayGetSize(fa) == 1)
+    {
+      // Support single-valued arrays...
+      filter = pdfioArrayGetName(fa, 0);
+    }
 
     if (!filter)
     {
       // No single filter name, do we have a compound filter?
-      if (pdfioDictGetArray(dict, "Filter"))
+      if (fa)
       {
 	// TODO: Implement compound filters...
 	_pdfioFileError(st->pdf, "Unsupported compound stream filter.");