Avoid some unnecessary static readonly arrays

src/libraries/Common/src/Interop/Windows/Version/Interop.GetFileVersionInfoEx.cs

@@ -10,11 +10,11 @@ internal static partial class Version
     {
         [LibraryImport(Libraries.Version, EntryPoint = "GetFileVersionInfoExW", StringMarshalling = StringMarshalling.Utf16)]
         [return: MarshalAs(UnmanagedType.Bool)]
-        internal static partial bool GetFileVersionInfoEx(
+        internal static unsafe partial bool GetFileVersionInfoEx(
                     uint dwFlags,
                     string lpwstrFilename,
                     uint dwHandle,
                     uint dwLen,
-                    IntPtr lpData);
+                    void* lpData);
     }
 }

src/libraries/Common/src/Interop/Windows/Version/Interop.VerQueryValue.cs

@@ -10,6 +10,6 @@ internal static partial class Version
     {
         [LibraryImport(Libraries.Version, EntryPoint = "VerQueryValueW", StringMarshalling = StringMarshalling.Utf16)]
         [return: MarshalAs(UnmanagedType.Bool)]
-        internal static partial bool VerQueryValue(IntPtr pBlock, string lpSubBlock, out IntPtr lplpBuffer, out uint puLen);
+        internal static unsafe partial bool VerQueryValue(void* pBlock, string lpSubBlock, out void* lplpBuffer, out uint puLen);
     }
 }

src/libraries/System.Diagnostics.FileVersionInfo/src/System/Diagnostics/FileVersionInfo.Windows.cs

@@ -12,110 +12,83 @@ private unsafe FileVersionInfo(string fileName)
         {
             _fileName = fileName;
 
-            uint handle;  // This variable is not used, but we need an out variable.
-            uint infoSize = Interop.Version.GetFileVersionInfoSizeEx(
-                (uint)Interop.Version.FileVersionInfoType.FILE_VER_GET_LOCALISED, _fileName, out handle);
-
+            uint infoSize = Interop.Version.GetFileVersionInfoSizeEx(Interop.Version.FileVersionInfoType.FILE_VER_GET_LOCALISED, _fileName, out _);
             if (infoSize != 0)
             {
-                byte[] mem = new byte[infoSize];
-                fixed (byte* memPtr = &mem[0])
+                void* memPtr = NativeMemory.Alloc(infoSize);
+                try
                 {
-                    IntPtr memIntPtr = new IntPtr((void*)memPtr);
                     if (Interop.Version.GetFileVersionInfoEx(
-                            (uint)Interop.Version.FileVersionInfoType.FILE_VER_GET_LOCALISED | (uint)Interop.Version.FileVersionInfoType.FILE_VER_GET_NEUTRAL,
-                            _fileName,
-                            0U,
-                            infoSize,
-                            memIntPtr))
+                        Interop.Version.FileVersionInfoType.FILE_VER_GET_LOCALISED | Interop.Version.FileVersionInfoType.FILE_VER_GET_NEUTRAL,
+                        _fileName,
+                        0U,
+                        infoSize,
+                        memPtr))
                     {
-                        uint langid = GetVarEntry(memIntPtr);
-                        if (!GetVersionInfoForCodePage(memIntPtr, ConvertTo8DigitHex(langid)))
-                        {
-                            // Some DLLs might not contain correct codepage information. In these cases we will fail during lookup.
-                            // Explorer will take a few shots in dark by trying several specific lang-codepages
-                            // (Explorer also randomly guesses 041D04B0=Swedish+CP_UNICODE and 040704B0=German+CP_UNICODE sometimes).
-                            // We will try to simulate similar behavior here.
-                            foreach (uint id in s_fallbackLanguageCodePages)
-                            {
-                                if (id != langid)
-                                {
-                                    if (GetVersionInfoForCodePage(memIntPtr, ConvertTo8DigitHex(id)))
-                                    {
-                                        break;
-                                    }
-                                }
-                            }
-                        }
+                        // Some dlls might not contain correct codepage information, in which case the lookup will fail. Explorer will take
+                        // a few shots in dark. We'll simulate similar behavior by falling back to the following lang-codepages.
+                        uint lcp = GetLanguageAndCodePage(memPtr);
+                        _ = GetVersionInfoForCodePage(memPtr, lcp.ToString("X8")) ||
+                            (lcp != 0x040904B0 && GetVersionInfoForCodePage(memPtr, "040904B0")) || // US English + CP_UNICODE
+                            (lcp != 0x040904E4 && GetVersionInfoForCodePage(memPtr, "040904E4")) || // US English + CP_USASCII
+                            (lcp != 0x04090000 && GetVersionInfoForCodePage(memPtr, "04090000"));   // US English + unknown codepage
                     }
                 }
+                finally
+                {
+                    NativeMemory.Free(memPtr);
+                }
             }
         }
 
-        // Some dlls might not contain correct codepage information,
-        // in which case the lookup will fail. Explorer will take
-        // a few shots in dark. We'll simulate similar behavior by
-        // falling back to the following lang-codepages:
-        private static readonly uint[] s_fallbackLanguageCodePages = new uint[]
-        {
-            0x040904B0, // US English + CP_UNICODE
-            0x040904E4, // US English + CP_USASCII
-            0x04090000  // US English + unknown codepage
-        };
-
-        private static string ConvertTo8DigitHex(uint value)
-        {
-            return value.ToString("X8");
-        }
-
-        private static unsafe Interop.Version.VS_FIXEDFILEINFO GetFixedFileInfo(IntPtr memPtr)
+        private static unsafe Interop.Version.VS_FIXEDFILEINFO GetFixedFileInfo(void* memPtr)
         {
-            if (Interop.Version.VerQueryValue(memPtr, "\\", out IntPtr memRef, out _))
+            if (Interop.Version.VerQueryValue(memPtr, "\\", out void* memRef, out _))
             {
                 return *(Interop.Version.VS_FIXEDFILEINFO*)memRef;
             }
 
             return default;
         }
 
-        private static unsafe string GetFileVersionLanguage(IntPtr memPtr)
+        private static unsafe string GetFileVersionLanguage(void* memPtr)
         {
-            uint langid = GetVarEntry(memPtr) >> 16;
+            uint langid = GetLanguageAndCodePage(memPtr) >> 16;
 
             const int MaxLength = 256;
             char* lang = stackalloc char[MaxLength];
             int charsWritten = Interop.Kernel32.VerLanguageName(langid, lang, MaxLength);
             return new string(lang, 0, charsWritten);
         }
 
-        private static string GetFileVersionString(IntPtr memPtr, string name)
+        private static unsafe string GetFileVersionString(void* memPtr, string name)
         {
-            if (Interop.Version.VerQueryValue(memPtr, name, out IntPtr memRef, out _))
+            if (Interop.Version.VerQueryValue(memPtr, name, out void* memRef, out _) &&
+                memRef is not null)
             {
-                if (memRef != IntPtr.Zero)
-                {
-                    return Marshal.PtrToStringUni(memRef)!;
-                }
+                return Marshal.PtrToStringUni((IntPtr)memRef)!;
             }
 
             return string.Empty;
         }
 
-        private static uint GetVarEntry(IntPtr memPtr)
+        private static unsafe uint GetLanguageAndCodePage(void* memPtr)
         {
-            if (Interop.Version.VerQueryValue(memPtr, "\\VarFileInfo\\Translation", out IntPtr memRef, out _))
+            if (Interop.Version.VerQueryValue(memPtr, "\\VarFileInfo\\Translation", out void* memRef, out _))
             {
-                return (uint)((Marshal.ReadInt16(memRef) << 16) + Marshal.ReadInt16((IntPtr)((long)memRef + 2)));
+                return
+                    (uint)((*(ushort*)memRef << 16) +
+                    *((ushort*)memRef + 1));
             }
 
-            return 0x040904E4;
+            return 0x040904E4; // US English + CP_USASCII
         }
 
         //
         // This function tries to find version information for a specific codepage.
         // Returns true when version information is found.
         //
-        private bool GetVersionInfoForCodePage(IntPtr memIntPtr, string codepage)
+        private unsafe bool GetVersionInfoForCodePage(void* memIntPtr, string codepage)
         {
             Span<char> stackBuffer = stackalloc char[256];
 
@@ -144,24 +117,18 @@ private bool GetVersionInfoForCodePage(IntPtr memIntPtr, string codepage)
             _productBuild = (int)HIWORD(ffi.dwProductVersionLS);
             _productPrivate = (int)LOWORD(ffi.dwProductVersionLS);
 
-            _isDebug = (ffi.dwFileFlags & (uint)Interop.Version.FileVersionInfo.VS_FF_DEBUG) != 0;
-            _isPatched = (ffi.dwFileFlags & (uint)Interop.Version.FileVersionInfo.VS_FF_PATCHED) != 0;
-            _isPrivateBuild = (ffi.dwFileFlags & (uint)Interop.Version.FileVersionInfo.VS_FF_PRIVATEBUILD) != 0;
-            _isPreRelease = (ffi.dwFileFlags & (uint)Interop.Version.FileVersionInfo.VS_FF_PRERELEASE) != 0;
-            _isSpecialBuild = (ffi.dwFileFlags & (uint)Interop.Version.FileVersionInfo.VS_FF_SPECIALBUILD) != 0;
+            _isDebug = (ffi.dwFileFlags & Interop.Version.FileVersionInfo.VS_FF_DEBUG) != 0;
+            _isPatched = (ffi.dwFileFlags & Interop.Version.FileVersionInfo.VS_FF_PATCHED) != 0;
+            _isPrivateBuild = (ffi.dwFileFlags & Interop.Version.FileVersionInfo.VS_FF_PRIVATEBUILD) != 0;
+            _isPreRelease = (ffi.dwFileFlags & Interop.Version.FileVersionInfo.VS_FF_PRERELEASE) != 0;
+            _isSpecialBuild = (ffi.dwFileFlags & Interop.Version.FileVersionInfo.VS_FF_SPECIALBUILD) != 0;
 
             // fileVersion is chosen based on best guess. Other fields can be used if appropriate.
             return (_fileVersion != string.Empty);
         }
 
-        private static uint HIWORD(uint dword)
-        {
-            return (dword >> 16) & 0xffff;
-        }
+        private static uint HIWORD(uint dword) => (dword >> 16) & 0xffff;
 
-        private static uint LOWORD(uint dword)
-        {
-            return dword & 0xffff;
-        }
+        private static uint LOWORD(uint dword) => dword & 0xffff;
     }
 }

src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/MultiProxy.cs

@@ -11,16 +11,13 @@ namespace System.Net.Http
     /// </summary>
     internal struct MultiProxy
     {
-        private static readonly char[] s_proxyDelimiters = { ';', ' ', '\n', '\r', '\t' };
         private readonly FailedProxyCache? _failedProxyCache;
         private readonly Uri[]? _uris;
         private readonly string? _proxyConfig;
         private readonly bool _secure;
         private int _currentIndex;
         private Uri? _currentUri;
 
-        public static MultiProxy Empty => new MultiProxy(null, Array.Empty<Uri>());
-
         private MultiProxy(FailedProxyCache? failedProxyCache, Uri[] uris)
         {
             _failedProxyCache = failedProxyCache;
@@ -41,6 +38,8 @@ private MultiProxy(FailedProxyCache failedProxyCache, string proxyConfig, bool s
             _currentUri = null;
         }
 
+        public static MultiProxy Empty => new MultiProxy(null, Array.Empty<Uri>());
+
         /// <summary>
         /// Parses a WinHTTP proxy config into a MultiProxy instance.
         /// </summary>
@@ -198,6 +197,7 @@ private static bool TryParseProxyConfigPart(ReadOnlySpan<char> proxyString, bool
         {
             const int SECURE_FLAG = 1;
             const int INSECURE_FLAG = 2;
+            const string ProxyDelimiters = "; \n\r\t";
 
             int wantedFlag = secure ? SECURE_FLAG : INSECURE_FLAG;
             int originalLength = proxyString.Length;
@@ -206,7 +206,7 @@ private static bool TryParseProxyConfigPart(ReadOnlySpan<char> proxyString, bool
             {
                 // Skip any delimiters.
                 int iter = 0;
-                while (iter < proxyString.Length && Array.IndexOf(s_proxyDelimiters, proxyString[iter]) >= 0)
+                while (iter < proxyString.Length && ProxyDelimiters.Contains(proxyString[iter]))
                 {
                     ++iter;
                 }
@@ -245,7 +245,7 @@ private static bool TryParseProxyConfigPart(ReadOnlySpan<char> proxyString, bool
                 }
 
                 // Find the next delimiter, or end of string.
-                iter = proxyString.IndexOfAny(s_proxyDelimiters);
+                iter = proxyString.IndexOfAny(ProxyDelimiters);
                 if (iter < 0)
                 {
                     iter = proxyString.Length;

src/libraries/System.Net.HttpListener/src/System/Net/HttpListenerResponse.cs

@@ -79,20 +79,11 @@ public bool SendChunked
             set => EntitySendFormat = value ? EntitySendFormat.Chunked : EntitySendFormat.ContentLength;
         }
 
-        // We MUST NOT send message-body when we send responses with these Status codes
-        private static readonly int[] s_noResponseBody = { 100, 101, 204, 205, 304 };
 
-        private static bool CanSendResponseBody(int responseCode)
-        {
-            for (int i = 0; i < s_noResponseBody.Length; i++)
-            {
-                if (responseCode == s_noResponseBody[i])
-                {
-                    return false;
-                }
-            }
-            return true;
-        }
+
+        private static bool CanSendResponseBody(int responseCode) =>
+            // We MUST NOT send message-body when we send responses with these Status codes
+            responseCode is not (100 or 101 or 204 or 205 or 304);
 
         public long ContentLength64
         {

src/libraries/System.Net.HttpListener/src/System/Net/Managed/HttpListenerRequest.Managed.cs

@@ -73,11 +73,9 @@ internal HttpListenerRequest(HttpListenerContext context)
             _version = HttpVersion.Version10;
         }
 
-        private static readonly char[] s_separators = new char[] { ' ' };
-
         internal void SetRequestLine(string req)
         {
-            string[] parts = req.Split(s_separators, 3);
+            string[] parts = req.Split(' ', 3);
             if (parts.Length != 3)
             {
                 _context.ErrorMessage = "Invalid request line (parts).";

src/libraries/System.Net.Primitives/src/System/Net/Cookie.cs

@@ -41,8 +41,7 @@ public sealed class Cookie
 
         internal static readonly char[] PortSplitDelimiters = new char[] { ' ', ',', '\"' };
         // Space (' ') should be reserved as well per RFCs, but major web browsers support it and some web sites use it - so we support it too
-        internal static readonly char[] ReservedToName = new char[] { '\t', '\r', '\n', '=', ';', ',' };
-        internal static readonly char[] ReservedToValue = new char[] { ';', ',' };
+        internal const string ReservedToName = "\t\r\n=;,";
 
         private string m_comment = string.Empty; // Do not rename (binary serialization)
         private Uri? m_commentUri; // Do not rename (binary serialization)
@@ -239,7 +238,7 @@ internal bool InternalSetName(string? value)
                 || value.StartsWith('$')
                 || value.StartsWith(' ')
                 || value.EndsWith(' ')
-                || value.IndexOfAny(ReservedToName) >= 0)
+                || value.AsSpan().IndexOfAny(ReservedToName) >= 0)
             {
                 m_name = string.Empty;
                 return false;
@@ -347,7 +346,7 @@ internal bool VerifySetDefaults(CookieVariant variant, Uri uri, bool isLocalDoma
                 m_name.StartsWith('$') ||
                 m_name.StartsWith(' ') ||
                 m_name.EndsWith(' ') ||
-                m_name.IndexOfAny(ReservedToName) >= 0)
+                m_name.AsSpan().IndexOfAny(ReservedToName) >= 0)
             {
                 if (shouldThrow)
                 {
@@ -358,7 +357,7 @@ internal bool VerifySetDefaults(CookieVariant variant, Uri uri, bool isLocalDoma
 
             // Check the value
             if (m_value == null ||
-                (!(m_value.Length > 2 && m_value.StartsWith('\"') && m_value.EndsWith('\"')) && m_value.IndexOfAny(ReservedToValue) >= 0))
+                (!(m_value.Length > 2 && m_value.StartsWith('\"') && m_value.EndsWith('\"')) && m_value.AsSpan().IndexOfAny(';', ',') >= 0))
             {
                 if (shouldThrow)
                 {
@@ -369,7 +368,7 @@ internal bool VerifySetDefaults(CookieVariant variant, Uri uri, bool isLocalDoma
 
             // Check Comment syntax
             if (Comment != null && !(Comment.Length > 2 && Comment.StartsWith('\"') && Comment.EndsWith('\"'))
-                && (Comment.IndexOfAny(ReservedToValue) >= 0))
+                && (Comment.AsSpan().IndexOfAny(';', ',') >= 0))
             {
                 if (shouldThrow)
                 {
@@ -380,7 +379,7 @@ internal bool VerifySetDefaults(CookieVariant variant, Uri uri, bool isLocalDoma
 
             // Check Path syntax
             if (Path != null && !(Path.Length > 2 && Path.StartsWith('\"') && Path.EndsWith('\"'))
-                && (Path.IndexOfAny(ReservedToValue) >= 0))
+                && (Path.AsSpan().IndexOfAny(';', ',') != -1))
             {
                 if (shouldThrow)
                 {

src/libraries/System.Private.CoreLib/src/System/Convert.cs

@@ -101,13 +101,9 @@ public static partial class Convert
         // Need to special case Enum because typecode will be underlying type, e.g. Int32
         private static readonly Type EnumType = typeof(Enum);
 
-        internal static readonly char[] base64Table = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
-                                                        'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
-                                                        'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
-                                                        't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
-                                                        '8', '9', '+', '/', '=' };
+        internal const string Base64Table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
-        private const int base64LineBreakPosition = 76;
+        private const int Base64LineBreakPosition = 76;
 
 #if DEBUG
         static Convert()
@@ -2473,14 +2469,14 @@ private static unsafe int ConvertToBase64Array(char* outChars, byte* inData, int
             // Convert three bytes at a time to base64 notation.  This will consume 4 chars.
             int i;
 
-            // get a pointer to the base64Table to avoid unnecessary range checking
-            fixed (char* base64 = &base64Table[0])
+            // get a pointer to the Base64Table to avoid unnecessary range checking
+            fixed (char* base64 = Base64Table)
             {
                 for (i = offset; i < calcLength; i += 3)
                 {
                     if (insertLineBreaks)
                     {
-                        if (charcount == base64LineBreakPosition)
+                        if (charcount == Base64LineBreakPosition)
                         {
                             outChars[j++] = '\r';
                             outChars[j++] = '\n';
@@ -2498,7 +2494,7 @@ private static unsafe int ConvertToBase64Array(char* outChars, byte* inData, int
                 // Where we left off before
                 i = calcLength;
 
-                if (insertLineBreaks && (lengthmod3 != 0) && (charcount == base64LineBreakPosition))
+                if (insertLineBreaks && (lengthmod3 != 0) && (charcount == Base64LineBreakPosition))
                 {
                     outChars[j++] = '\r';
                     outChars[j++] = '\n';
@@ -2536,7 +2532,7 @@ private static int ToBase64_CalculateAndValidateOutputLength(int inputLength, bo
 
             if (insertLineBreaks)
             {
-                (uint newLines, uint remainder) = Math.DivRem(outlen, base64LineBreakPosition);
+                (uint newLines, uint remainder) = Math.DivRem(outlen, Base64LineBreakPosition);
                 if (remainder == 0)
                 {
                     --newLines;