EncodingNLS.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Text;
 
internal abstract class EncodingNLS : Encoding
{
    private string _encodingName;
 
    private string _webName;
 
    public override string EncodingName
    {
        get
        {
            if (_encodingName == null)
            {
                _encodingName = GetLocalizedEncodingNameResource(CodePage);
                if (_encodingName == null)
                {
                    throw new NotSupportedException(System.SR.Format(System.SR.MissingEncodingNameResource, WebName, CodePage));
                }
                if (_encodingName.StartsWith("Globalization_cp_", StringComparison.OrdinalIgnoreCase))
                {
                    _encodingName = System.Text.EncodingTable.GetEnglishNameFromCodePage(CodePage);
                    if (_encodingName == null)
                    {
                        throw new NotSupportedException(System.SR.Format(System.SR.MissingEncodingNameResource, WebName, CodePage));
                    }
                }
            }
            return _encodingName;
        }
    }
 
    public override string WebName
    {
        get
        {
            if (_webName == null)
            {
                _webName = System.Text.EncodingTable.GetWebNameFromCodePage(CodePage);
                if (_webName == null)
                {
                    throw new NotSupportedException(System.SR.Format(System.SR.NotSupported_NoCodepageData, CodePage));
                }
            }
            return _webName;
        }
    }
 
    public override string HeaderName => CodePage switch
    {
        932 => "iso-2022-jp", 
        50221 => "iso-2022-jp", 
        50225 => "euc-kr", 
        _ => WebName, 
    };
 
    public override string BodyName => CodePage switch
    {
        932 => "iso-2022-jp", 
        1250 => "iso-8859-2", 
        1251 => "koi8-r", 
        1252 => "iso-8859-1", 
        1253 => "iso-8859-7", 
        1254 => "iso-8859-9", 
        50221 => "iso-2022-jp", 
        50225 => "iso-2022-kr", 
        _ => WebName, 
    };
 
    protected EncodingNLS(int codePage)
        : base(codePage)
    {
    }
 
    protected EncodingNLS(int codePage, EncoderFallback enc, DecoderFallback dec)
        : base(codePage, enc, dec)
    {
    }
 
    public unsafe abstract int GetByteCount(char* chars, int count, System.Text.EncoderNLS encoder);
 
    public unsafe abstract int GetBytes(char* chars, int charCount, byte* bytes, int byteCount, System.Text.EncoderNLS encoder);
 
    public unsafe abstract int GetCharCount(byte* bytes, int count, System.Text.DecoderNLS decoder);
 
    public unsafe abstract int GetChars(byte* bytes, int byteCount, char* chars, int charCount, System.Text.DecoderNLS decoder);
 
    public unsafe override int GetByteCount(char[] chars, int index, int count)
    {
        if (chars == null)
        {
            throw new ArgumentNullException("chars", System.SR.ArgumentNull_Array);
        }
        if (index < 0 || count < 0)
        {
            throw new ArgumentOutOfRangeException((index < 0) ? "index" : "count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        if (chars.Length - index < count)
        {
            throw new ArgumentOutOfRangeException("chars", System.SR.ArgumentOutOfRange_IndexCountBuffer);
        }
        if (chars.Length == 0)
        {
            return 0;
        }
        fixed (char* ptr = &chars[0])
        {
            return GetByteCount(ptr + index, count, null);
        }
    }
 
    public unsafe override int GetByteCount(string s)
    {
        if (s == null)
        {
            throw new ArgumentNullException("s");
        }
        fixed (char* chars = s)
        {
            return GetByteCount(chars, s.Length, null);
        }
    }
 
    public unsafe override int GetByteCount(char* chars, int count)
    {
        if (chars == null)
        {
            throw new ArgumentNullException("chars", System.SR.ArgumentNull_Array);
        }
        if (count < 0)
        {
            throw new ArgumentOutOfRangeException("count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        return GetByteCount(chars, count, null);
    }
 
    public unsafe override int GetBytes(string s, int charIndex, int charCount, byte[] bytes, int byteIndex)
    {
        if (s == null || bytes == null)
        {
            throw new ArgumentNullException((s == null) ? "s" : "bytes", System.SR.ArgumentNull_Array);
        }
        if (charIndex < 0 || charCount < 0)
        {
            throw new ArgumentOutOfRangeException((charIndex < 0) ? "charIndex" : "charCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        if (s.Length - charIndex < charCount)
        {
            throw new ArgumentOutOfRangeException("s", System.SR.ArgumentOutOfRange_IndexCount);
        }
        if (byteIndex < 0 || byteIndex > bytes.Length)
        {
            throw new ArgumentOutOfRangeException("byteIndex", System.SR.ArgumentOutOfRange_Index);
        }
        int byteCount = bytes.Length - byteIndex;
        if (bytes.Length == 0)
        {
            bytes = new byte[1];
        }
        fixed (char* ptr = s)
        {
            fixed (byte* ptr2 = &bytes[0])
            {
                return GetBytes(ptr + charIndex, charCount, ptr2 + byteIndex, byteCount, null);
            }
        }
    }
 
    public unsafe override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
    {
        if (chars == null || bytes == null)
        {
            throw new ArgumentNullException((chars == null) ? "chars" : "bytes", System.SR.ArgumentNull_Array);
        }
        if (charIndex < 0 || charCount < 0)
        {
            throw new ArgumentOutOfRangeException((charIndex < 0) ? "charIndex" : "charCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        if (chars.Length - charIndex < charCount)
        {
            throw new ArgumentOutOfRangeException("chars", System.SR.ArgumentOutOfRange_IndexCountBuffer);
        }
        if (byteIndex < 0 || byteIndex > bytes.Length)
        {
            throw new ArgumentOutOfRangeException("byteIndex", System.SR.ArgumentOutOfRange_Index);
        }
        if (chars.Length == 0)
        {
            return 0;
        }
        int byteCount = bytes.Length - byteIndex;
        if (bytes.Length == 0)
        {
            bytes = new byte[1];
        }
        fixed (char* ptr = &chars[0])
        {
            fixed (byte* ptr2 = &bytes[0])
            {
                return GetBytes(ptr + charIndex, charCount, ptr2 + byteIndex, byteCount, null);
            }
        }
    }
 
    public unsafe override int GetBytes(char* chars, int charCount, byte* bytes, int byteCount)
    {
        if (bytes == null || chars == null)
        {
            throw new ArgumentNullException((bytes == null) ? "bytes" : "chars", System.SR.ArgumentNull_Array);
        }
        if (charCount < 0 || byteCount < 0)
        {
            throw new ArgumentOutOfRangeException((charCount < 0) ? "charCount" : "byteCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        return GetBytes(chars, charCount, bytes, byteCount, null);
    }
 
    public unsafe override int GetCharCount(byte[] bytes, int index, int count)
    {
        if (bytes == null)
        {
            throw new ArgumentNullException("bytes", System.SR.ArgumentNull_Array);
        }
        if (index < 0 || count < 0)
        {
            throw new ArgumentOutOfRangeException((index < 0) ? "index" : "count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        if (bytes.Length - index < count)
        {
            throw new ArgumentOutOfRangeException("bytes", System.SR.ArgumentOutOfRange_IndexCountBuffer);
        }
        if (bytes.Length == 0)
        {
            return 0;
        }
        fixed (byte* ptr = &bytes[0])
        {
            return GetCharCount(ptr + index, count, null);
        }
    }
 
    public unsafe override int GetCharCount(byte* bytes, int count)
    {
        if (bytes == null)
        {
            throw new ArgumentNullException("bytes", System.SR.ArgumentNull_Array);
        }
        if (count < 0)
        {
            throw new ArgumentOutOfRangeException("count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        return GetCharCount(bytes, count, null);
    }
 
    public unsafe override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
    {
        if (bytes == null || chars == null)
        {
            throw new ArgumentNullException((bytes == null) ? "bytes" : "chars", System.SR.ArgumentNull_Array);
        }
        if (byteIndex < 0 || byteCount < 0)
        {
            throw new ArgumentOutOfRangeException((byteIndex < 0) ? "byteIndex" : "byteCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        if (bytes.Length - byteIndex < byteCount)
        {
            throw new ArgumentOutOfRangeException("bytes", System.SR.ArgumentOutOfRange_IndexCountBuffer);
        }
        if (charIndex < 0 || charIndex > chars.Length)
        {
            throw new ArgumentOutOfRangeException("charIndex", System.SR.ArgumentOutOfRange_Index);
        }
        if (bytes.Length == 0)
        {
            return 0;
        }
        int charCount = chars.Length - charIndex;
        if (chars.Length == 0)
        {
            chars = new char[1];
        }
        fixed (byte* ptr = &bytes[0])
        {
            fixed (char* ptr2 = &chars[0])
            {
                return GetChars(ptr + byteIndex, byteCount, ptr2 + charIndex, charCount, null);
            }
        }
    }
 
    public unsafe override int GetChars(byte* bytes, int byteCount, char* chars, int charCount)
    {
        if (bytes == null || chars == null)
        {
            throw new ArgumentNullException((bytes == null) ? "bytes" : "chars", System.SR.ArgumentNull_Array);
        }
        if (charCount < 0 || byteCount < 0)
        {
            throw new ArgumentOutOfRangeException((charCount < 0) ? "charCount" : "byteCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        return GetChars(bytes, byteCount, chars, charCount, null);
    }
 
    public unsafe override string GetString(byte[] bytes, int index, int count)
    {
        if (bytes == null)
        {
            throw new ArgumentNullException("bytes", System.SR.ArgumentNull_Array);
        }
        if (index < 0 || count < 0)
        {
            throw new ArgumentOutOfRangeException((index < 0) ? "index" : "count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
        }
        if (bytes.Length - index < count)
        {
            throw new ArgumentOutOfRangeException("bytes", System.SR.ArgumentOutOfRange_IndexCountBuffer);
        }
        if (bytes.Length == 0)
        {
            return string.Empty;
        }
        fixed (byte* ptr = &bytes[0])
        {
            return GetString(ptr + index, count);
        }
    }
 
    public override Decoder GetDecoder()
    {
        return new System.Text.DecoderNLS(this);
    }
 
    public override Encoder GetEncoder()
    {
        return new System.Text.EncoderNLS(this);
    }
 
    internal void ThrowBytesOverflow(System.Text.EncoderNLS encoder, bool nothingEncoded)
    {
        if ((encoder?.m_throwOnOverflow ?? true) || nothingEncoded)
        {
            if (encoder != null && encoder.InternalHasFallbackBuffer)
            {
                encoder.FallbackBuffer.Reset();
            }
            ThrowBytesOverflow();
        }
        encoder.ClearMustFlush();
    }
 
    internal void ThrowCharsOverflow(System.Text.DecoderNLS decoder, bool nothingDecoded)
    {
        if ((decoder?.m_throwOnOverflow ?? true) || nothingDecoded)
        {
            if (decoder != null && decoder.InternalHasFallbackBuffer)
            {
                decoder.FallbackBuffer.Reset();
            }
            ThrowCharsOverflow();
        }
        decoder.ClearMustFlush();
    }
 
    [DoesNotReturn]
    internal void ThrowBytesOverflow()
    {
        throw new ArgumentException(System.SR.Format(System.SR.Argument_EncodingConversionOverflowBytes, EncodingName, base.EncoderFallback.GetType()), "bytes");
    }
 
    [DoesNotReturn]
    internal void ThrowCharsOverflow()
    {
        throw new ArgumentException(System.SR.Format(System.SR.Argument_EncodingConversionOverflowChars, EncodingName, base.DecoderFallback.GetType()), "chars");
    }
 
    internal static string GetLocalizedEncodingNameResource(int codePage)
    {
        return codePage switch
        {
            37 => System.SR.Globalization_cp_37, 
            437 => System.SR.Globalization_cp_437, 
            500 => System.SR.Globalization_cp_500, 
            708 => System.SR.Globalization_cp_708, 
            720 => System.SR.Globalization_cp_720, 
            737 => System.SR.Globalization_cp_737, 
            775 => System.SR.Globalization_cp_775, 
            850 => System.SR.Globalization_cp_850, 
            852 => System.SR.Globalization_cp_852, 
            855 => System.SR.Globalization_cp_855, 
            857 => System.SR.Globalization_cp_857, 
            858 => System.SR.Globalization_cp_858, 
            860 => System.SR.Globalization_cp_860, 
            861 => System.SR.Globalization_cp_861, 
            862 => System.SR.Globalization_cp_862, 
            863 => System.SR.Globalization_cp_863, 
            864 => System.SR.Globalization_cp_864, 
            865 => System.SR.Globalization_cp_865, 
            866 => System.SR.Globalization_cp_866, 
            869 => System.SR.Globalization_cp_869, 
            870 => System.SR.Globalization_cp_870, 
            874 => System.SR.Globalization_cp_874, 
            875 => System.SR.Globalization_cp_875, 
            932 => System.SR.Globalization_cp_932, 
            936 => System.SR.Globalization_cp_936, 
            949 => System.SR.Globalization_cp_949, 
            950 => System.SR.Globalization_cp_950, 
            1026 => System.SR.Globalization_cp_1026, 
            1047 => System.SR.Globalization_cp_1047, 
            1140 => System.SR.Globalization_cp_1140, 
            1141 => System.SR.Globalization_cp_1141, 
            1142 => System.SR.Globalization_cp_1142, 
            1143 => System.SR.Globalization_cp_1143, 
            1144 => System.SR.Globalization_cp_1144, 
            1145 => System.SR.Globalization_cp_1145, 
            1146 => System.SR.Globalization_cp_1146, 
            1147 => System.SR.Globalization_cp_1147, 
            1148 => System.SR.Globalization_cp_1148, 
            1149 => System.SR.Globalization_cp_1149, 
            1250 => System.SR.Globalization_cp_1250, 
            1251 => System.SR.Globalization_cp_1251, 
            1252 => System.SR.Globalization_cp_1252, 
            1253 => System.SR.Globalization_cp_1253, 
            1254 => System.SR.Globalization_cp_1254, 
            1255 => System.SR.Globalization_cp_1255, 
            1256 => System.SR.Globalization_cp_1256, 
            1257 => System.SR.Globalization_cp_1257, 
            1258 => System.SR.Globalization_cp_1258, 
            1361 => System.SR.Globalization_cp_1361, 
            10000 => System.SR.Globalization_cp_10000, 
            10001 => System.SR.Globalization_cp_10001, 
            10002 => System.SR.Globalization_cp_10002, 
            10003 => System.SR.Globalization_cp_10003, 
            10004 => System.SR.Globalization_cp_10004, 
            10005 => System.SR.Globalization_cp_10005, 
            10006 => System.SR.Globalization_cp_10006, 
            10007 => System.SR.Globalization_cp_10007, 
            10008 => System.SR.Globalization_cp_10008, 
            10010 => System.SR.Globalization_cp_10010, 
            10017 => System.SR.Globalization_cp_10017, 
            10021 => System.SR.Globalization_cp_10021, 
            10029 => System.SR.Globalization_cp_10029, 
            10079 => System.SR.Globalization_cp_10079, 
            10081 => System.SR.Globalization_cp_10081, 
            10082 => System.SR.Globalization_cp_10082, 
            20000 => System.SR.Globalization_cp_20000, 
            20001 => System.SR.Globalization_cp_20001, 
            20002 => System.SR.Globalization_cp_20002, 
            20003 => System.SR.Globalization_cp_20003, 
            20004 => System.SR.Globalization_cp_20004, 
            20005 => System.SR.Globalization_cp_20005, 
            20105 => System.SR.Globalization_cp_20105, 
            20106 => System.SR.Globalization_cp_20106, 
            20107 => System.SR.Globalization_cp_20107, 
            20108 => System.SR.Globalization_cp_20108, 
            20261 => System.SR.Globalization_cp_20261, 
            20269 => System.SR.Globalization_cp_20269, 
            20273 => System.SR.Globalization_cp_20273, 
            20277 => System.SR.Globalization_cp_20277, 
            20278 => System.SR.Globalization_cp_20278, 
            20280 => System.SR.Globalization_cp_20280, 
            20284 => System.SR.Globalization_cp_20284, 
            20285 => System.SR.Globalization_cp_20285, 
            20290 => System.SR.Globalization_cp_20290, 
            20297 => System.SR.Globalization_cp_20297, 
            20420 => System.SR.Globalization_cp_20420, 
            20423 => System.SR.Globalization_cp_20423, 
            20424 => System.SR.Globalization_cp_20424, 
            20833 => System.SR.Globalization_cp_20833, 
            20838 => System.SR.Globalization_cp_20838, 
            20866 => System.SR.Globalization_cp_20866, 
            20871 => System.SR.Globalization_cp_20871, 
            20880 => System.SR.Globalization_cp_20880, 
            20905 => System.SR.Globalization_cp_20905, 
            20924 => System.SR.Globalization_cp_20924, 
            20932 => System.SR.Globalization_cp_20932, 
            20936 => System.SR.Globalization_cp_20936, 
            20949 => System.SR.Globalization_cp_20949, 
            21025 => System.SR.Globalization_cp_21025, 
            21027 => System.SR.Globalization_cp_21027, 
            21866 => System.SR.Globalization_cp_21866, 
            28592 => System.SR.Globalization_cp_28592, 
            28593 => System.SR.Globalization_cp_28593, 
            28594 => System.SR.Globalization_cp_28594, 
            28595 => System.SR.Globalization_cp_28595, 
            28596 => System.SR.Globalization_cp_28596, 
            28597 => System.SR.Globalization_cp_28597, 
            28598 => System.SR.Globalization_cp_28598, 
            28599 => System.SR.Globalization_cp_28599, 
            28603 => System.SR.Globalization_cp_28603, 
            28605 => System.SR.Globalization_cp_28605, 
            29001 => System.SR.Globalization_cp_29001, 
            38598 => System.SR.Globalization_cp_38598, 
            50000 => System.SR.Globalization_cp_50000, 
            50220 => System.SR.Globalization_cp_50220, 
            50221 => System.SR.Globalization_cp_50221, 
            50222 => System.SR.Globalization_cp_50222, 
            50225 => System.SR.Globalization_cp_50225, 
            50227 => System.SR.Globalization_cp_50227, 
            50229 => System.SR.Globalization_cp_50229, 
            50930 => System.SR.Globalization_cp_50930, 
            50931 => System.SR.Globalization_cp_50931, 
            50933 => System.SR.Globalization_cp_50933, 
            50935 => System.SR.Globalization_cp_50935, 
            50937 => System.SR.Globalization_cp_50937, 
            50939 => System.SR.Globalization_cp_50939, 
            51932 => System.SR.Globalization_cp_51932, 
            51936 => System.SR.Globalization_cp_51936, 
            51949 => System.SR.Globalization_cp_51949, 
            52936 => System.SR.Globalization_cp_52936, 
            54936 => System.SR.Globalization_cp_54936, 
            57002 => System.SR.Globalization_cp_57002, 
            57003 => System.SR.Globalization_cp_57003, 
            57004 => System.SR.Globalization_cp_57004, 
            57005 => System.SR.Globalization_cp_57005, 
            57006 => System.SR.Globalization_cp_57006, 
            57007 => System.SR.Globalization_cp_57007, 
            57008 => System.SR.Globalization_cp_57008, 
            57009 => System.SR.Globalization_cp_57009, 
            57010 => System.SR.Globalization_cp_57010, 
            57011 => System.SR.Globalization_cp_57011, 
            _ => null, 
        };
    }
}