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using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security;
namespace System.Text
{
internal static partial class EncodingHelper
{
//
// Only internal, to be used by the class libraries: Unmarked and non-input-validating
//
internal static Encoding UTF8Unmarked {
get {
if (utf8EncodingWithoutMarkers == null) {
lock (lockobj){
if (utf8EncodingWithoutMarkers == null){
utf8EncodingWithoutMarkers = new UTF8Encoding (false, false);
utf8EncodingWithoutMarkers.setReadOnly ();
}
}
}
return utf8EncodingWithoutMarkers;
}
}
//
// Only internal, to be used by the class libraries: Unmarked and non-input-validating
//
internal static Encoding UTF8UnmarkedUnsafe {
get {
if (utf8EncodingUnsafe == null) {
lock (lockobj){
if (utf8EncodingUnsafe == null){
utf8EncodingUnsafe = new UTF8Encoding (false, false);
utf8EncodingUnsafe.setReadOnly (false);
utf8EncodingUnsafe.DecoderFallback = new DecoderReplacementFallback (String.Empty);
utf8EncodingUnsafe.setReadOnly ();
}
}
}
return utf8EncodingUnsafe;
}
}
// Get the standard big-endian UTF-32 encoding object.
internal static Encoding BigEndianUTF32
{
get {
if (bigEndianUTF32Encoding == null) {
lock (lockobj) {
if (bigEndianUTF32Encoding == null) {
bigEndianUTF32Encoding = new UTF32Encoding (true, true);
bigEndianUTF32Encoding.setReadOnly ();
}
}
}
return bigEndianUTF32Encoding;
}
}
static volatile Encoding utf8EncodingWithoutMarkers;
static volatile Encoding utf8EncodingUnsafe;
static volatile Encoding bigEndianUTF32Encoding;
static readonly object lockobj = new object ();
[MethodImpl (MethodImplOptions.InternalCall)]
extern internal static string InternalCodePage (ref int code_page);
#if !MONOTOUCH && !WASM
internal static Encoding GetDefaultEncoding ()
{
Encoding enc = null;
// See if the underlying system knows what
// code page handler we should be using.
int code_page = 1;
string code_page_name = InternalCodePage (ref code_page);
try {
if (code_page == -1)
enc = Encoding.GetEncoding (code_page_name);
else {
// map the codepage from internal to our numbers
code_page = code_page & 0x0fffffff;
switch (code_page){
case 1: code_page = 20127; break; // ASCIIEncoding.ASCII_CODE_PAGE
case 2: code_page = 65007; break; // UTF7Encoding.UTF7_CODE_PAGE
case 3: code_page = 65001; break; // UTF8Encoding.UTF8_CODE_PAGE
case 4: code_page = 1200; break; // UnicodeEncoding.UNICODE_CODE_PAGE
case 5: code_page = 1201; break; // UnicodeEncoding.BIG_UNICODE_CODE_PAGE
case 6: code_page = 1252; break; // Latin1Encoding.ISOLATIN_CODE_PAGE
}
enc = Encoding.GetEncoding (code_page);
}
} catch (NotSupportedException) {
// code_page is not supported on underlying platform
enc = EncodingHelper.UTF8Unmarked;
} catch (ArgumentException) {
// code_page_name is not a valid code page, or is
// not supported by underlying OS
enc = EncodingHelper.UTF8Unmarked;
}
return enc;
}
#endif
// Loaded copy of the "I18N" assembly. We need to move
// this into a class in "System.Private" eventually.
private static Assembly i18nAssembly;
private static bool i18nDisabled;
// Invoke a specific method on the "I18N" manager object.
// Returns NULL if the method failed.
internal static Object InvokeI18N (String name, params Object[] args)
{
lock (lockobj) {
// Bail out if we previously detected that there
// is insufficent engine support for I18N handling.
if (i18nDisabled) {
return null;
}
// Find or load the "I18N" assembly.
if (i18nAssembly == null) {
try {
try {
i18nAssembly = Assembly.Load (Consts.AssemblyI18N);
} catch (NotImplementedException) {
// Assembly loading unsupported by the engine.
i18nDisabled = true;
return null;
}
if (i18nAssembly == null) {
return null;
}
} catch (SystemException) {
return null;
}
}
// Find the "I18N.Common.Manager" class.
Type managerClass;
try {
managerClass = i18nAssembly.GetType ("I18N.Common.Manager");
} catch (NotImplementedException) {
// "GetType" is not supported by the engine.
i18nDisabled = true;
return null;
}
if (managerClass == null) {
return null;
}
// Get the value of the "PrimaryManager" property.
Object manager;
try {
manager = managerClass.InvokeMember
("PrimaryManager",
BindingFlags.GetProperty |
BindingFlags.Static |
BindingFlags.Public,
null, null, null, null, null, null);
if (manager == null) {
return null;
}
} catch (MissingMethodException) {
return null;
} catch (SecurityException) {
return null;
} catch (NotImplementedException) {
// "InvokeMember" is not supported by the engine.
i18nDisabled = true;
return null;
}
// Invoke the requested method on the manager.
try {
return managerClass.InvokeMember
(name,
BindingFlags.InvokeMethod |
BindingFlags.Instance |
BindingFlags.Public,
null, manager, args, null, null, null);
} catch (MissingMethodException) {
return null;
} catch (SecurityException) {
return null;
}
}
}
}
}
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