Added a new function SetFilePermissions to set permissions of a file. I'm not sure about the Windows implementation. See this feature request: https://bugs.alliedmods.net/show_bug.cgi?id=6152

core/logic/smn_filesystem.cpp

@@ -39,6 +39,11 @@
 #include <ITranslator.h>
 #include "common_logic.h"
 
+#if defined PLATFORM_WINDOWS
+#include <io.h>
+#include "smn_filesystem.h"
+#endif
+
 HandleType_t g_FileType;
 HandleType_t g_DirType;
 IChangeableForward *g_pLogHook = NULL;
@@ -465,6 +470,31 @@ static cell_t sm_FileSize(IPluginContext *pContext, const cell_t *params)
 #endif
 }
 
+static cell_t sm_SetFilePermissions(IPluginContext *pContext, const cell_t *params)
+{
+	char *name;
+	char realpath[PLATFORM_MAX_PATH];
+
+	pContext->LocalToString(params[1], &name);
+	g_pSM->BuildPath(Path_Game, realpath, sizeof(realpath), "%s", name);
+
+#if defined PLATFORM_WINDOWS
+	int mask;
+	if (params[2] & FPERM_U_WRITE || params[2] & FPERM_G_WRITE || params[2] & FPERM_O_WRITE)
+	{
+		mask |= _S_IWRITE;
+	}
+	if (params[2] & FPERM_U_READ || params[2] & FPERM_G_READ || params[2] & FPERM_O_READ ||
+		params[2] & FPERM_U_EXEC || params[2] & FPERM_G_EXEC || params[2] & FPERM_O_EXEC)
+	{
+		mask |= _S_IREAD;
+	}
+	return _chmod(realpath, mask) == 0;
+#else
+	return chmod(realpath, params[2]) == 0;
+#endif
+}
+
 static cell_t sm_CreateDirectory(IPluginContext *pContext, const cell_t *params)
 {
 	char *name;
@@ -971,5 +1001,6 @@ REGISTER_NATIVES(filesystem)
 	{"AddGameLogHook",			sm_AddGameLogHook},
 	{"RemoveGameLogHook",		sm_RemoveGameLogHook},
 	{"CreateDirectory",			sm_CreateDirectory},
+	{"SetFilePermissions",		sm_SetFilePermissions},
 	{NULL,						NULL},
 };