[USETUP][SETUPLIB] Code refactoring.

- Move several global setup variables into a structure "USETUP_DATA",
  similar to the syssetup structure "SETUPDATA" (or the WIP 1st-stage
  installer structure of the same name), so that these variables can be
  set easily by different helper setup functions;

- Move CheckUnattendedSetup() and GetSourcePaths() to setuplib and make
  CheckUnattendedSetup() use the USETUP_DATA structure;

- Add a LoadSetupInf() function that loads the txtsetup.sif file
  (factoring out the corresponding code in USETUP);

- Add a InstallSetupInfFile() function (that I'll probably rename later on)
  whose purpose is to create a valid "$winnt$.inf" setup installation file
  in the ReactOS\system32 directory, which should help the 2nd-stage installer
  to correctly retrieve the source installation media we used during 1st-stage,
  and contain the unattended setup lines copied from unattend.inf. This is
  done in a Windows-compatible way.

svn path=/branches/setup_improvements/; revision=75518

[USETUP] Close the txtsetup.sif file at the end of the operations.

svn path=/branches/setup_improvements/; revision=75539

base/setup/lib/setuplib.h

@@ -32,6 +32,7 @@ extern HANDLE ProcessHeap;
 #include "filesup.h"
 #include "fsutil.h"
 #include "genlist.h"
+#include "infsupp.h"
 #include "inicache.h"
 #include "partlist.h"
 #include "arcname.h"
@@ -49,4 +50,74 @@ extern HANDLE ProcessHeap;
 // #define PB (KB*KB*KB*KB*KB)
 
 
+/* TYPEDEFS *****************************************************************/
+
+typedef struct _USETUP_DATA
+{
+/* SOURCE Paths *****/
+    UNICODE_STRING SourceRootPath;
+    UNICODE_STRING SourceRootDir;
+    UNICODE_STRING SourcePath;
+
+/* DESTINATION Paths *****/
+    /*
+     * Path to the system partition, where the boot manager resides.
+     * On x86 PCs, this is usually the active partition.
+     * On ARC, (u)EFI, ... platforms, this is a dedicated partition.
+     *
+     * For more information, see:
+     * https://en.wikipedia.org/wiki/System_partition_and_boot_partition
+     * http://homepage.ntlworld.com/jonathan.deboynepollard/FGA/boot-and-system-volumes.html
+     * http://homepage.ntlworld.com/jonathan.deboynepollard/FGA/arc-boot-process.html
+     * http://homepage.ntlworld.com/jonathan.deboynepollard/FGA/efi-boot-process.html
+     * http://homepage.ntlworld.com/jonathan.deboynepollard/FGA/determining-system-volume.html
+     * http://homepage.ntlworld.com/jonathan.deboynepollard/FGA/determining-boot-volume.html
+     */
+    UNICODE_STRING SystemRootPath;
+
+    /* Path to the installation directory inside the ReactOS boot partition */
+    UNICODE_STRING DestinationPath;     /** Equivalent of 'NTOS_INSTALLATION::SystemNtPath' **/
+    UNICODE_STRING DestinationArcPath;  /** Equivalent of 'NTOS_INSTALLATION::SystemArcPath' **/
+    UNICODE_STRING DestinationRootPath;
+
+    LONG DestinationDiskNumber;
+    LONG DestinationPartitionNumber;
+    LONG MBRInstallType;
+
+    LONG FormatPartition;
+    LONG AutoPartition;
+
+    WCHAR LocaleID[9];
+    LANGID LanguageId;
+
+    ULONG RequiredPartitionDiskSpace;
+    WCHAR InstallationDirectory[MAX_PATH];
+} USETUP_DATA, *PUSETUP_DATA;
+
+// HACK!!
+extern BOOLEAN IsUnattendedSetup;
+
+
+/* FUNCTIONS ****************************************************************/
+
+VOID
+CheckUnattendedSetup(
+    IN OUT PUSETUP_DATA pSetupData);
+
+VOID
+InstallSetupInfFile(
+    IN OUT PUSETUP_DATA pSetupData);
+
+NTSTATUS
+GetSourcePaths(
+    OUT PUNICODE_STRING SourcePath,
+    OUT PUNICODE_STRING SourceRootPath,
+    OUT PUNICODE_STRING SourceRootDir);
+
+ERROR_NUMBER
+LoadSetupInf(
+    OUT HINF* SetupInf,
+    IN OUT PUSETUP_DATA pSetupData);
+
+
 /* EOF */