fix: Set active CP to UTF-8 on Windows 10 and 11

This notably allows passing unicode filenames as commandline arguments
to the demo utility `bin/base64` without them being mangled in case the
unicode filename cannot be represented in the currently active system
code page.

Note that this only works/takes effect on Windows 10 Version 1903 and
later.

See-Also: https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page

.github/workflows/test.yml

@@ -212,6 +212,13 @@ jobs:
       - name: CTest
         shell: msys2 {0}
         run: ctest --no-tests=error --test-dir out -VV --build-config Release
+      - name: Test demo utility with unicode filenames and file contents on Windows
+        shell: msys2 {0}
+        run: |
+          out/bin/base64 test/ci/😵‍💫.bin > test/ci/😵‍💫.bin.b64
+          out/bin/base64 -d test/ci/😵‍💫.bin.b64 > test/ci/😵‍💫.bin
+          cd test/ci
+          sha256sum -c checksums.txt
 
   msys2-makefile-test:
     name: msys2-makefile-${{ matrix.msystem }}

CMakeLists.txt

@@ -249,6 +249,10 @@ if (BASE64_BUILD_CLI)
     set_target_properties(base64-bin PROPERTIES
         OUTPUT_NAME base64
     )
+
+    if (WIN32)
+      target_sources(base64-bin PRIVATE bin/base64.rc)
+    endif ()
 endif()
 
 ########################################################################

bin/base64.manifest

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+	<assemblyIdentity type="win32" name="base64" version="0.5.2.0" />
+	<trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
+		<security>
+			<requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
+				<requestedExecutionLevel level="asInvoker" uiAccess="false" />
+			</requestedPrivileges>
+		</security>
+	</trustInfo>
+	<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+		<application>
+			<!-- Windows 10 and Windows 11 -->
+			<supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+		</application>
+	</compatibility>
+	<application>
+		<windowsSettings>
+			<activeCodePage
+				xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>
+		</windowsSettings>
+	</application>
+</assembly>

bin/base64.rc

@@ -0,0 +1,2 @@
+#include "winuser.h"
+CREATEPROCESS_MANIFEST_RESOURCE_ID RT_MANIFEST "base64.manifest"

test/ci/checksums.txt

@@ -0,0 +1 @@
+4cd842ba8dce30216f77d2d5bf8a648e2dba6d95be5b12884f81e55bfab7b3cc *😵‍💫.bin

test/ci/😵‍💫.bin

@@ -0,0 +1,2 @@
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+😵‍💫