[SETUPLIB] Introduce a helper for copying bootloader files (reactos#7310)

This function could be generalized later to copy other files necessary
for the bootloader; removing also the currently hardcoded placement in
the installation source directory, and instead, using a configurable
path (specified in txtsetup.sif); etc.

Adapted from a commit by Timo Kreuzer (see PR reactos#7420)

Co-Authored-By: Timo Kreuzer <[email protected]>

Author: HBelusca

base/setup/lib/bootsup.c

@@ -878,6 +878,31 @@ InstallMbrBootCodeToDisk(
 }
 
 
+static
+NTSTATUS
+InstallBootloaderFiles(
+    _In_ PCUNICODE_STRING SystemRootPath,
+    _In_ PCUNICODE_STRING SourceRootPath)
+{
+    NTSTATUS Status;
+    WCHAR SrcPath[MAX_PATH];
+    WCHAR DstPath[MAX_PATH];
+
+    /* Copy FreeLoader to the system partition, always overwriting the older version */
+    CombinePaths(SrcPath, ARRAYSIZE(SrcPath), 2, SourceRootPath->Buffer, L"\\loader\\freeldr.sys");
+    CombinePaths(DstPath, ARRAYSIZE(DstPath), 2, SystemRootPath->Buffer, L"freeldr.sys");
+
+    DPRINT1("Copy: %S ==> %S\n", SrcPath, DstPath);
+    Status = SetupCopyFile(SrcPath, DstPath, FALSE);
+    if (!NT_SUCCESS(Status))
+    {
+        DPRINT1("SetupCopyFile() failed (Status 0x%08lx)\n", Status);
+        return Status;
+    }
+
+    return STATUS_SUCCESS;
+}
+
 static
 NTSTATUS
 InstallFatBootcodeToPartition(
@@ -894,15 +919,11 @@ InstallFatBootcodeToPartition(
     /* FAT or FAT32 partition */
     DPRINT("System path: '%wZ'\n", SystemRootPath);
 
-    /* Copy FreeLoader to the system partition, always overwriting the older version */
-    CombinePaths(SrcPath, ARRAYSIZE(SrcPath), 2, SourceRootPath->Buffer, L"\\loader\\freeldr.sys");
-    CombinePaths(DstPath, ARRAYSIZE(DstPath), 2, SystemRootPath->Buffer, L"freeldr.sys");
-
-    DPRINT("Copy: %S ==> %S\n", SrcPath, DstPath);
-    Status = SetupCopyFile(SrcPath, DstPath, FALSE);
+    /* Install the bootloader */
+    Status = InstallBootloaderFiles(SystemRootPath, SourceRootPath);
     if (!NT_SUCCESS(Status))
     {
-        DPRINT1("SetupCopyFile() failed (Status %lx)\n", Status);
+        DPRINT1("InstallBootloaderFiles() failed (Status %lx)\n", Status);
         return Status;
     }
 
@@ -1187,15 +1208,11 @@ InstallBtrfsBootcodeToPartition(
     /* BTRFS partition */
     DPRINT("System path: '%wZ'\n", SystemRootPath);
 
-    /* Copy FreeLoader to the system partition, always overwriting the older version */
-    CombinePaths(SrcPath, ARRAYSIZE(SrcPath), 2, SourceRootPath->Buffer, L"\\loader\\freeldr.sys");
-    CombinePaths(DstPath, ARRAYSIZE(DstPath), 2, SystemRootPath->Buffer, L"freeldr.sys");
-
-    DPRINT("Copy: %S ==> %S\n", SrcPath, DstPath);
-    Status = SetupCopyFile(SrcPath, DstPath, FALSE);
+    /* Install the bootloader */
+    Status = InstallBootloaderFiles(SystemRootPath, SourceRootPath);
     if (!NT_SUCCESS(Status))
     {
-        DPRINT1("SetupCopyFile() failed (Status %lx)\n", Status);
+        DPRINT1("InstallBootloaderFiles() failed (Status %lx)\n", Status);
         return Status;
     }
 
@@ -1290,15 +1307,11 @@ InstallNtfsBootcodeToPartition(
     /* NTFS partition */
     DPRINT("System path: '%wZ'\n", SystemRootPath);
 
-    /* Copy FreeLoader to the system partition, always overwriting the older version */
-    CombinePaths(SrcPath, ARRAYSIZE(SrcPath), 2, SourceRootPath->Buffer, L"\\loader\\freeldr.sys");
-    CombinePaths(DstPath, ARRAYSIZE(DstPath), 2, SystemRootPath->Buffer, L"freeldr.sys");
-
-    DPRINT1("Copy: %S ==> %S\n", SrcPath, DstPath);
-    Status = SetupCopyFile(SrcPath, DstPath, FALSE);
+    /* Install the bootloader */
+    Status = InstallBootloaderFiles(SystemRootPath, SourceRootPath);
     if (!NT_SUCCESS(Status))
     {
-        DPRINT1("SetupCopyFile() failed (Status %lx)\n", Status);
+        DPRINT1("InstallBootloaderFiles() failed (Status %lx)\n", Status);
         return Status;
     }