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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
namespace System.Globalization
{
public sealed partial class IdnMapping
{
private unsafe string NlsGetAsciiCore(string unicodeString, char* unicode, int count)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(GlobalizationMode.UseNls);
Debug.Assert(unicodeString != null && unicodeString.Length >= count);
uint flags = NlsFlags;
// Determine the required length
int length = Interop.Normaliz.IdnToAscii(flags, unicode, count, null, 0);
if (length == 0)
{
ThrowForZeroLength(unicode: true);
}
// Do the conversion
const int StackAllocThreshold = 512; // arbitrary limit to switch from stack to heap allocation
if (length < StackAllocThreshold)
{
char* output = stackalloc char[length];
return NlsGetAsciiCore(unicodeString, unicode, count, flags, output, length);
}
else
{
char[] output = new char[length];
fixed (char* pOutput = &output[0])
{
return NlsGetAsciiCore(unicodeString, unicode, count, flags, pOutput, length);
}
}
}
private static unsafe string NlsGetAsciiCore(string unicodeString, char* unicode, int count, uint flags, char* output, int outputLength)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(GlobalizationMode.UseNls);
Debug.Assert(unicodeString != null && unicodeString.Length >= count);
int length = Interop.Normaliz.IdnToAscii(flags, unicode, count, output, outputLength);
if (length == 0)
{
ThrowForZeroLength(unicode: true);
}
Debug.Assert(length == outputLength);
return GetStringForOutput(unicodeString, unicode, count, output, length);
}
private unsafe string NlsGetUnicodeCore(string asciiString, char* ascii, int count)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(GlobalizationMode.UseNls);
Debug.Assert(asciiString != null && asciiString.Length >= count);
uint flags = NlsFlags;
// Determine the required length
int length = Interop.Normaliz.IdnToUnicode(flags, ascii, count, null, 0);
if (length == 0)
{
ThrowForZeroLength(unicode: false);
}
// Do the conversion
const int StackAllocThreshold = 512; // arbitrary limit to switch from stack to heap allocation
if (length < StackAllocThreshold)
{
char* output = stackalloc char[length];
return NlsGetUnicodeCore(asciiString, ascii, count, flags, output, length);
}
else
{
char[] output = new char[length];
fixed (char* pOutput = &output[0])
{
return NlsGetUnicodeCore(asciiString, ascii, count, flags, pOutput, length);
}
}
}
private static unsafe string NlsGetUnicodeCore(string asciiString, char* ascii, int count, uint flags, char* output, int outputLength)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(GlobalizationMode.UseNls);
Debug.Assert(asciiString != null && asciiString.Length >= count);
int length = Interop.Normaliz.IdnToUnicode(flags, ascii, count, output, outputLength);
if (length == 0)
{
ThrowForZeroLength(unicode: false);
}
Debug.Assert(length == outputLength);
return GetStringForOutput(asciiString, ascii, count, output, length);
}
private uint NlsFlags
{
get
{
int flags =
(AllowUnassigned ? Interop.Normaliz.IDN_ALLOW_UNASSIGNED : 0) |
(UseStd3AsciiRules ? Interop.Normaliz.IDN_USE_STD3_ASCII_RULES : 0);
return (uint)flags;
}
}
[DoesNotReturn]
private static void ThrowForZeroLength(bool unicode)
{
int lastError = Marshal.GetLastPInvokeError();
throw new ArgumentException(
lastError == Interop.Errors.ERROR_INVALID_NAME ? SR.Argument_IdnIllegalName :
(unicode ? SR.Argument_InvalidCharSequenceNoIndex : SR.Argument_IdnBadPunycode),
unicode ? "unicode" : "ascii");
}
}
}
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