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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.
#nullable enable
namespace System.Buffers.Text
{
public static partial class Utf8Parser
{
//
// Parse an RFC1123 date string.
//
// 01234567890123456789012345678
// -----------------------------
// Tue, 03 Jan 2017 08:08:05 GMT
//
private static bool TryParseDateTimeOffsetR(ReadOnlySpan<byte> source, uint caseFlipXorMask, out DateTimeOffset dateTimeOffset, out int bytesConsumed)
{
if (source.Length < 29)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
DayOfWeek dayOfWeek;
{
uint dow0 = source[0] ^ caseFlipXorMask;
uint dow1 = source[1];
uint dow2 = source[2];
uint comma = source[3];
uint dowString = (dow0 << 24) | (dow1 << 16) | (dow2 << 8) | comma;
switch (dowString)
{
case 0x53756E2c /* 'Sun,' */: dayOfWeek = DayOfWeek.Sunday; break;
case 0x4d6f6e2c /* 'Mon,' */: dayOfWeek = DayOfWeek.Monday; break;
case 0x5475652c /* 'Tue,' */: dayOfWeek = DayOfWeek.Tuesday; break;
case 0x5765642c /* 'Wed,' */: dayOfWeek = DayOfWeek.Wednesday; break;
case 0x5468752c /* 'Thu,' */: dayOfWeek = DayOfWeek.Thursday; break;
case 0x4672692c /* 'Fri,' */: dayOfWeek = DayOfWeek.Friday; break;
case 0x5361742c /* 'Sat,' */: dayOfWeek = DayOfWeek.Saturday; break;
default:
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
}
if (source[4] != Utf8Constants.Space)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
int day;
{
uint digit1 = source[5] - 48u; // '0'
uint digit2 = source[6] - 48u; // '0'
if (digit1 > 9 || digit2 > 9)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
day = (int)(digit1 * 10 + digit2);
}
if (source[7] != Utf8Constants.Space)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
int month;
{
uint mon0 = source[8] ^ caseFlipXorMask;
uint mon1 = source[9];
uint mon2 = source[10];
uint space = source[11];
uint monthString = (mon0 << 24) | (mon1 << 16) | (mon2 << 8) | space;
switch (monthString)
{
case 0x4a616e20 /* 'Jan ' */ : month = 1; break;
case 0x46656220 /* 'Feb ' */ : month = 2; break;
case 0x4d617220 /* 'Mar ' */ : month = 3; break;
case 0x41707220 /* 'Apr ' */ : month = 4; break;
case 0x4d617920 /* 'May ' */ : month = 5; break;
case 0x4a756e20 /* 'Jun ' */ : month = 6; break;
case 0x4a756c20 /* 'Jul ' */ : month = 7; break;
case 0x41756720 /* 'Aug ' */ : month = 8; break;
case 0x53657020 /* 'Sep ' */ : month = 9; break;
case 0x4f637420 /* 'Oct ' */ : month = 10; break;
case 0x4e6f7620 /* 'Nov ' */ : month = 11; break;
case 0x44656320 /* 'Dec ' */ : month = 12; break;
default:
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
}
int year;
{
uint digit1 = source[12] - 48u; // '0'
uint digit2 = source[13] - 48u; // '0'
uint digit3 = source[14] - 48u; // '0'
uint digit4 = source[15] - 48u; // '0'
if (digit1 > 9 || digit2 > 9 || digit3 > 9 || digit4 > 9)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
year = (int)(digit1 * 1000 + digit2 * 100 + digit3 * 10 + digit4);
}
if (source[16] != Utf8Constants.Space)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
int hour;
{
uint digit1 = source[17] - 48u; // '0'
uint digit2 = source[18] - 48u; // '0'
if (digit1 > 9 || digit2 > 9)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
hour = (int)(digit1 * 10 + digit2);
}
if (source[19] != Utf8Constants.Colon)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
int minute;
{
uint digit1 = source[20] - 48u; // '0'
uint digit2 = source[21] - 48u; // '0'
if (digit1 > 9 || digit2 > 9)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
minute = (int)(digit1 * 10 + digit2);
}
if (source[22] != Utf8Constants.Colon)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
int second;
{
uint digit1 = source[23] - 48u; // '0'
uint digit2 = source[24] - 48u; // '0'
if (digit1 > 9 || digit2 > 9)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
second = (int)(digit1 * 10 + digit2);
}
{
uint space = source[25];
uint g = source[26] ^ caseFlipXorMask;
uint m = source[27] ^ caseFlipXorMask;
uint t = source[28] ^ caseFlipXorMask;
uint gmtString = (space << 24) | (g << 16) | (m << 8) | t;
if (gmtString != 0x20474d54 /* ' GMT' */)
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
}
if (!TryCreateDateTimeOffset(year: year, month: month, day: day, hour: hour, minute: minute, second: second, fraction: 0, offsetNegative: false, offsetHours: 0, offsetMinutes: 0, out dateTimeOffset))
{
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
if (dayOfWeek != dateTimeOffset.DayOfWeek)
{
// If we got here, the day of week did not match the actual date.
bytesConsumed = 0;
dateTimeOffset = default;
return false;
}
bytesConsumed = 29;
return true;
}
}
}
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