139 lines
4.9 KiB
C#
139 lines
4.9 KiB
C#
//------------------------------------------------------------------------------
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// 此代码版权（除特别声明或在XREF结尾的命名空间的代码）归作者本人若汝棋茗所有
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// 源代码使用协议遵循本仓库的开源协议及附加协议，若本仓库没有设置，则按MIT开源协议授权
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// CSDN博客：https://blog.csdn.net/qq_40374647
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// 哔哩哔哩视频：https://space.bilibili.com/94253567
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// Gitee源代码仓库：https://gitee.com/RRQM_Home
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// Github源代码仓库：https://github.com/RRQM
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// API首页：https://touchsocket.net/
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// 交流QQ群：234762506
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// 感谢您的下载和使用
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//------------------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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namespace TouchSocket.Http
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{
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/// <summary>
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/// Range: bytes=0-499 表示第 0-499 字节范围的内容
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/// Range: bytes=500-999 表示第 500-999 字节范围的内容
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/// Range: bytes=-500 表示最后 500 字节的内容
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/// Range: bytes=500- 表示从第 500 字节开始到文件结束部分的内容
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/// Range: bytes=0-0,-1 表示第一个和最后一个字节
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/// Range: bytes=500-600,601-999 同时指定几个范围
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/// </summary>
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public class HttpRange
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{
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/// <summary>
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/// 转换获取的集合
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/// </summary>
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/// <param name="rangeStr"></param>
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/// <param name="size"></param>
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/// <returns></returns>
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public static HttpRange[] GetRanges(string rangeStr, long size)
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{
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var ranges = rangeStr.Split('=');
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if (ranges.Length != 2)
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{
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return new HttpRange[0];
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}
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rangeStr = ranges[1];
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if (string.IsNullOrEmpty(rangeStr))
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{
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return new HttpRange[0];
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}
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ranges = rangeStr.Split(',');
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var httpRanges = new List<HttpRange>();
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foreach (var range in ranges)
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{
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var httpRange = new HttpRange();
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ranges = range.Split('-');
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if (ranges.Length == 2)
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{
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if (range.StartsWith("-"))
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{
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httpRange.Length = Convert.ToInt64(ranges[1]);
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httpRange.Start = size - httpRange.Length;
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}
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else if (range.EndsWith("-"))
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{
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httpRange.Start = Convert.ToInt64(ranges[0]);
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httpRange.Length = size - httpRange.Start;
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}
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else
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{
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httpRange.Start = Convert.ToInt64(ranges[0]);
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httpRange.Length = Convert.ToInt64(ranges[1]) - httpRange.Start + 1;
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}
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}
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else
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{
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continue;
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}
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httpRanges.Add(httpRange);
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}
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return httpRanges.ToArray();
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}
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/// <summary>
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/// 转换获取的集合
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/// </summary>
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/// <param name="rangeStr"></param>
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/// <param name="size"></param>
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/// <returns></returns>
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public static HttpRange GetRange(string rangeStr, long size)
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{
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var ranges = rangeStr.Split('=');
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if (ranges.Length != 2)
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{
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return null;
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}
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rangeStr = ranges[1];
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if (string.IsNullOrEmpty(rangeStr))
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{
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return null;
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}
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ranges = rangeStr.Split(',');
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foreach (var range in ranges)
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{
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var httpRange = new HttpRange();
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ranges = range.Split('-');
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if (ranges.Length == 2)
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{
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if (range.StartsWith("-"))
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{
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httpRange.Length = Convert.ToInt64(ranges[1]);
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httpRange.Start = size - httpRange.Length;
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}
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else if (range.EndsWith("-"))
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{
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httpRange.Start = Convert.ToInt64(ranges[0]);
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httpRange.Length = size - httpRange.Start;
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}
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else
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{
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httpRange.Start = Convert.ToInt64(ranges[0]);
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httpRange.Length = Convert.ToInt64(ranges[1]) - httpRange.Start + 1;
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}
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}
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else
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{
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continue;
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}
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return httpRange;
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}
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return null;
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}
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/// <summary>
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/// 起始位置
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/// </summary>
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public long Start { get; set; } = -1;
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/// <summary>
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/// 长度
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/// </summary>
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public long Length { get; set; } = -1;
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}
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} |