using System.Buffers.Text; namespace System.Text.Json.Serialization.Converters { internal sealed class TimeSpanConverter : JsonConverter<TimeSpan> { private const int MinimumTimeSpanFormatLength = 8; private const int MaximumTimeSpanFormatLength = 26; private const int MaximumEscapedTimeSpanFormatLength = 156; public unsafe override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) { if (reader.TokenType != JsonTokenType.String) ThrowHelper.ThrowInvalidOperationException_ExpectedString(reader.TokenType); if (!JsonHelpers.IsInRangeInclusive(reader.ValueLength, 8, 156)) ThrowHelper.ThrowFormatException(DataType.TimeSpan); ReadOnlySpan<byte> source; if (!reader.HasValueSequence && !reader.ValueIsEscaped) source = reader.ValueSpan; else { Span<byte> span = new Span<byte>(stackalloc byte[156], 156); Span<byte> utf8Destination = span; int length = reader.CopyString(utf8Destination); source = utf8Destination.Slice(0, length); } byte b = source[0]; if (!JsonHelpers.IsDigit(b) && b != 45) ThrowHelper.ThrowFormatException(DataType.TimeSpan); if (!Utf8Parser.TryParse(source, out TimeSpan value, out int bytesConsumed, 'c') || source.Length != bytesConsumed) ThrowHelper.ThrowFormatException(DataType.TimeSpan); return value; } public unsafe override void Write(Utf8JsonWriter writer, TimeSpan value, JsonSerializerOptions options) { Span<byte> span = new Span<byte>(stackalloc byte[26], 26); Span<byte> destination = span; int bytesWritten; bool flag = Utf8Formatter.TryFormat(value, destination, out bytesWritten, 'c'); writer.WriteStringValue(destination.Slice(0, bytesWritten)); } } }