using System.Buffers; using System.Diagnostics.CodeAnalysis; using System.Runtime.CompilerServices; using System.Text.Encodings.Web; namespace System.Text.Json { public readonly struct JsonEncodedText : IEquatable<JsonEncodedText> { internal readonly byte[] _utf8Value; internal readonly string _value; public ReadOnlySpan<byte> EncodedUtf8Bytes => _utf8Value; [System.Runtime.CompilerServices.Nullable(1)] public string Value { [System.Runtime.CompilerServices.NullableContext(1)] get { return _value ?? string.Empty; } } private JsonEncodedText(byte[] utf8Value) { _value = JsonReaderHelper.GetTextFromUtf8(utf8Value); _utf8Value = utf8Value; } [System.Runtime.CompilerServices.NullableContext(1)] public static JsonEncodedText Encode(string value, [System.Runtime.CompilerServices.Nullable(2)] JavaScriptEncoder encoder = null) { if (value == null) ThrowHelper.ThrowArgumentNullException("value"); return Encode(value.AsSpan(), encoder); } public static JsonEncodedText Encode(ReadOnlySpan<char> value, [System.Runtime.CompilerServices.Nullable(2)] JavaScriptEncoder encoder = null) { if (value.Length == 0) return new JsonEncodedText(Array.Empty<byte>()); return TranscodeAndEncode(value, encoder); } private unsafe static JsonEncodedText TranscodeAndEncode(ReadOnlySpan<char> value, JavaScriptEncoder encoder) { JsonWriterHelper.ValidateValue(value); int utf8ByteCount = JsonReaderHelper.GetUtf8ByteCount(value); byte[] array = null; Span<byte> span = (utf8ByteCount > 256) ? ((Span<byte>)(array = ArrayPool<byte>.Shared.Rent(utf8ByteCount))) : new Span<byte>(stackalloc byte[256], 256); Span<byte> span2 = span; int utf8FromText = JsonReaderHelper.GetUtf8FromText(value, span2); span2 = span2.Slice(0, utf8FromText); JsonEncodedText result = EncodeHelper(span2, encoder); if (array != null) { span2.Clear(); ArrayPool<byte>.Shared.Return(array, false); } return result; } public static JsonEncodedText Encode(ReadOnlySpan<byte> utf8Value, [System.Runtime.CompilerServices.Nullable(2)] JavaScriptEncoder encoder = null) { if (utf8Value.Length == 0) return new JsonEncodedText(Array.Empty<byte>()); JsonWriterHelper.ValidateValue(utf8Value); return EncodeHelper(utf8Value, encoder); } private static JsonEncodedText EncodeHelper(ReadOnlySpan<byte> utf8Value, JavaScriptEncoder encoder) { int num = JsonWriterHelper.NeedsEscaping(utf8Value, encoder); if (num != -1) return new JsonEncodedText(JsonHelpers.EscapeValue(utf8Value, num, encoder)); return new JsonEncodedText(utf8Value.ToArray()); } public bool Equals(JsonEncodedText other) { if (_value == null) return other._value == null; return _value.Equals(other._value); } [System.Runtime.CompilerServices.NullableContext(2)] public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object obj) { if (obj is JsonEncodedText) { JsonEncodedText other = (JsonEncodedText)obj; return Equals(other); } return false; } [System.Runtime.CompilerServices.NullableContext(1)] public override string ToString() { return _value ?? string.Empty; } public override int GetHashCode() { if (_value != null) return _value.GetHashCode(); return 0; } } }