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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.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
namespace System.Globalization
{
sealed partial class IdnMapping
{
private unsafe string GetAsciiCore(string unicodeString, char* unicode, int count)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(unicodeString != null && unicodeString.Length >= count);
uint flags = Flags;
CheckInvalidIdnCharacters(unicode, count, flags, nameof(unicode));
const int StackallocThreshold = 512;
// Each unicode character is represented by up to 3 ASCII chars
// and the whole string is prefixed by "xn--" (length 4)
int estimatedLength = (int)Math.Min(count * 3L + 4, StackallocThreshold);
int actualLength;
if (estimatedLength < StackallocThreshold)
{
char* outputStack = stackalloc char[estimatedLength];
actualLength = Interop.Globalization.ToAscii(flags, unicode, count, outputStack, estimatedLength);
if (actualLength > 0 && actualLength <= estimatedLength)
{
return GetStringForOutput(unicodeString, unicode, count, outputStack, actualLength);
}
}
else
{
actualLength = Interop.Globalization.ToAscii(flags, unicode, count, null, 0);
}
if (actualLength == 0)
{
throw new ArgumentException(SR.Argument_IdnIllegalName, nameof(unicode));
}
char[] outputHeap = new char[actualLength];
fixed (char* pOutputHeap = &outputHeap[0])
{
actualLength = Interop.Globalization.ToAscii(flags, unicode, count, pOutputHeap, actualLength);
if (actualLength == 0 || actualLength > outputHeap.Length)
{
throw new ArgumentException(SR.Argument_IdnIllegalName, nameof(unicode));
}
return GetStringForOutput(unicodeString, unicode, count, pOutputHeap, actualLength);
}
}
private unsafe string GetUnicodeCore(string asciiString, char* ascii, int count)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(asciiString != null && asciiString.Length >= count);
uint flags = Flags;
CheckInvalidIdnCharacters(ascii, count, flags, nameof(ascii));
const int StackAllocThreshold = 512;
if (count < StackAllocThreshold)
{
char* output = stackalloc char[count];
return GetUnicodeCore(asciiString, ascii, count, flags, output, count, reattempt: true);
}
else
{
char[] output = new char[count];
fixed (char* pOutput = &output[0])
{
return GetUnicodeCore(asciiString, ascii, count, flags, pOutput, count, reattempt: true);
}
}
}
private unsafe string GetUnicodeCore(string asciiString, char* ascii, int count, uint flags, char* output, int outputLength, bool reattempt)
{
Debug.Assert(!GlobalizationMode.Invariant);
Debug.Assert(asciiString != null && asciiString.Length >= count);
int realLen = Interop.Globalization.ToUnicode(flags, ascii, count, output, outputLength);
if (realLen == 0)
{
throw new ArgumentException(SR.Argument_IdnIllegalName, nameof(ascii));
}
else if (realLen <= outputLength)
{
return GetStringForOutput(asciiString, ascii, count, output, realLen);
}
else if (reattempt)
{
char[] newOutput = new char[realLen];
fixed (char* pNewOutput = newOutput)
{
return GetUnicodeCore(asciiString, ascii, count, flags, pNewOutput, realLen, reattempt: false);
}
}
throw new ArgumentException(SR.Argument_IdnIllegalName, nameof(ascii));
}
// -----------------------------
// ---- PAL layer ends here ----
// -----------------------------
private uint Flags
{
get
{
int flags =
(AllowUnassigned ? Interop.Globalization.AllowUnassigned : 0) |
(UseStd3AsciiRules ? Interop.Globalization.UseStd3AsciiRules : 0);
return (uint)flags;
}
}
/// <summary>
/// ICU doesn't check for invalid characters unless the STD3 rules option
/// is enabled.
///
/// To match Windows behavior, we walk the string ourselves looking for these
/// bad characters so we can continue to throw ArgumentException in these cases.
/// </summary>
private static unsafe void CheckInvalidIdnCharacters(char* s, int count, uint flags, string paramName)
{
if ((flags & Interop.Globalization.UseStd3AsciiRules) == 0)
{
for (int i = 0; i < count; i++)
{
char c = s[i];
// These characters are prohibited regardless of the UseStd3AsciiRules property.
// See https://msdn.microsoft.com/en-us/library/system.globalization.idnmapping.usestd3asciirules(v=vs.110).aspx
if (c <= 0x1F || c == 0x7F)
{
throw new ArgumentException(SR.Argument_IdnIllegalName, paramName);
}
}
}
}
}
}
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