64 lines
2.2 KiB
C#
64 lines
2.2 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.IO.Pipelines;
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using System.Text;
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using Microsoft.AspNetCore.Server.Kestrel.Internal.Infrastructure;
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namespace Microsoft.AspNetCore.Server.Kestrel.Internal.Http
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{
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public static class ChunkWriter
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{
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private static readonly ArraySegment<byte> _endChunkBytes = CreateAsciiByteArraySegment("\r\n");
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private static readonly byte[] _hex = Encoding.ASCII.GetBytes("0123456789abcdef");
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private static ArraySegment<byte> CreateAsciiByteArraySegment(string text)
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{
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var bytes = Encoding.ASCII.GetBytes(text);
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return new ArraySegment<byte>(bytes);
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}
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public static ArraySegment<byte> BeginChunkBytes(int dataCount)
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{
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var bytes = new byte[10]
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{
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_hex[((dataCount >> 0x1c) & 0x0f)],
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_hex[((dataCount >> 0x18) & 0x0f)],
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_hex[((dataCount >> 0x14) & 0x0f)],
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_hex[((dataCount >> 0x10) & 0x0f)],
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_hex[((dataCount >> 0x0c) & 0x0f)],
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_hex[((dataCount >> 0x08) & 0x0f)],
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_hex[((dataCount >> 0x04) & 0x0f)],
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_hex[((dataCount >> 0x00) & 0x0f)],
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(byte)'\r',
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(byte)'\n',
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};
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// Determine the most-significant non-zero nibble
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int total, shift;
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total = (dataCount > 0xffff) ? 0x10 : 0x00;
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dataCount >>= total;
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shift = (dataCount > 0x00ff) ? 0x08 : 0x00;
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dataCount >>= shift;
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total |= shift;
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total |= (dataCount > 0x000f) ? 0x04 : 0x00;
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var offset = 7 - (total >> 2);
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return new ArraySegment<byte>(bytes, offset, 10 - offset);
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}
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public static int WriteBeginChunkBytes(ref WritableBuffer start, int dataCount)
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{
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var chunkSegment = BeginChunkBytes(dataCount);
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start.Write(chunkSegment);
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return chunkSegment.Count;
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}
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public static void WriteEndChunkBytes(ref WritableBuffer start)
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{
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start.Write(_endChunkBytes);
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}
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}
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}
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