[SETUPLIB][REACTOS][USETUP] Further improve the interfacing with INF and File-Queue APIs.

This allows using some of the SetupApi.dll functions when SETUPLIB is
used in the (Win32) GUI 1st-stage installer "REACTOS", while using the
custom implemented NT-aware functions in "USETUP".

base/setup/lib/spapisup/infsupp.c

@@ -0,0 +1,140 @@
+/*
+ * COPYRIGHT:       See COPYING in the top level directory
+ * PROJECT:         ReactOS Setup Library
+ * FILE:            base/setup/lib/infsupp.c
+ * PURPOSE:         Interfacing with Setup* API .INF Files support functions
+ * PROGRAMMERS:     Hervé Poussineau
+ *                  Hermes Belusca-Maito (hermes.belusca@sfr.fr)
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include "precomp.h"
+#include "infsupp.h"
+
+#define NDEBUG
+#include <debug.h>
+
+/* GLOBALS *******************************************************************/
+
+/*
+ * These externs should be defined by the user of this library.
+ * They are kept there for reference and ease of usage.
+ */
+#if 0
+
+pSpInfCloseInfFile  SpInfCloseInfFile  = NULL;
+pSpInfFindFirstLine SpInfFindFirstLine = NULL;
+pSpInfFindNextLine  SpInfFindNextLine  = NULL;
+pSpInfGetFieldCount SpInfGetFieldCount = NULL;
+pSpInfGetBinaryField  SpInfGetBinaryField  = NULL;
+pSpInfGetIntField     SpInfGetIntField     = NULL;
+pSpInfGetMultiSzField SpInfGetMultiSzField = NULL;
+pSpInfGetStringField  SpInfGetStringField  = NULL;
+pSpInfGetField    SpInfGetField    = NULL;
+pSpInfOpenInfFile SpInfOpenInfFile = NULL;
+
+#endif
+
+/* HELPER FUNCTIONS **********************************************************/
+
+BOOLEAN
+INF_GetDataField(
+    IN PINFCONTEXT Context,
+    IN ULONG FieldIndex,
+    OUT PCWSTR* Data)
+{
+#if 0
+
+    BOOL Success;
+    PWCHAR InfData;
+    DWORD dwSize;
+
+    *Data = NULL;
+
+    Success = SpInfGetStringField(Context,
+                                  FieldIndex,
+                                  NULL,
+                                  0,
+                                  &dwSize);
+    if (!Success)
+        return FALSE;
+
+    InfData = RtlAllocateHeap(ProcessHeap, 0, dwSize * sizeof(WCHAR));
+    if (!InfData)
+        return FALSE;
+
+    Success = SpInfGetStringField(Context,
+                                  FieldIndex,
+                                  InfData,
+                                  dwSize,
+                                  NULL);
+    if (!Success)
+    {
+        RtlFreeHeap(ProcessHeap, 0, InfData);
+        return FALSE;
+    }
+
+    *Data = InfData;
+    return TRUE;
+
+#else
+
+    *Data = SpInfGetField(Context, FieldIndex);
+    return !!*Data;
+
+#endif
+}
+
+BOOLEAN
+INF_GetData(
+    IN PINFCONTEXT Context,
+    OUT PCWSTR* Key,
+    OUT PCWSTR* Data)
+{
+    BOOL Success;
+    PCWSTR InfData[2] = {NULL, NULL};
+
+    if (Key)
+        *Key = NULL;
+
+    if (Data)
+        *Data = NULL;
+
+    /*
+     * Verify that the INF file has only one value field, in addition to its key name.
+     * Note that SpInfGetFieldCount() does not count the key name as a field.
+     */
+    if (SpInfGetFieldCount(Context) != 1)
+    {
+        DPRINT1("SpInfGetFieldCount != 1\n");
+        return FALSE;
+    }
+
+    if (Key)
+    {
+        Success = INF_GetDataField(Context, 0, &InfData[0]);
+        if (!Success)
+            return FALSE;
+    }
+
+    if (Data)
+    {
+        Success = INF_GetDataField(Context, 1, &InfData[1]);
+        if (!Success)
+        {
+            INF_FreeData(InfData[0]);
+            return FALSE;
+        }
+    }
+
+    if (Key)
+        *Key = InfData[0];
+
+    if (Data)
+        *Data = InfData[1];
+
+    return TRUE;
+}
+
+/* EOF */