111 lines
3.8 KiB
VB.net
111 lines
3.8 KiB
VB.net
#Region "Microsoft.VisualBasic::7e6e1cf52e25389a0f7fd11b13cfccdd, Microsoft.VisualBasic.Core\Net\HTTP\GZStream.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module GZStream
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'
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' Function: GZipAsBase64, GZipStream, UnGzipBase64, UnGzipStream
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.IO
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Imports System.IO.Compression
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Imports System.Runtime.CompilerServices
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Namespace Net.Http
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''' <summary>
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''' 请注意，这个模块是处理http请求或者响应之中的gzip压缩的数据，
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''' 对于zip压缩的数据需要使用<see cref="ZipStreamExtensions"/>模块之中的帮助函数来完成
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''' </summary>
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Public Module GZStream
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''' <summary>
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''' Unzip the stream data in the <paramref name="base64"/> string.
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''' </summary>
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''' <param name="base64$"></param>
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''' <returns></returns>
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'''
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function UnGzipBase64(base64$) As MemoryStream
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Return Convert.FromBase64String(base64).UnGzipStream
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End Function
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''' <summary>
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''' 将输入的流数据进行gzip解压缩
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''' </summary>
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''' <remarks>
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''' 使用这个函数得到的结果需要注意进行<see cref="IDisposable.Dispose()"/>,否则很容易造成内存泄漏
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''' </remarks>
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''' <param name="stream"></param>
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''' <returns></returns>
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<Extension>
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Public Function UnGzipStream(stream As IEnumerable(Of Byte)) As MemoryStream
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Using gz As New GZipStream(New MemoryStream(stream.ToArray), CompressionMode.Decompress)
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Dim ms As New MemoryStream
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Call gz.CopyTo(ms)
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Return ms
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End Using
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End Function
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''' <summary>
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''' 对所输入的流进行gzip压缩
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''' </summary>
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''' <param name="stream"></param>
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''' <returns></returns>
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<Extension>
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Public Function GZipStream(stream As Stream) As MemoryStream
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Dim ms As New MemoryStream
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Using gz As New GZipStream(ms, CompressionMode.Compress)
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Call stream.CopyTo(gz)
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Return ms
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End Using
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End Function
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''' <summary>
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''' 将目标流对象之中的数据进行zip压缩，然后转换为base64字符串
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''' </summary>
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''' <param name="stream"></param>
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''' <returns></returns>
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<Extension> Public Function GZipAsBase64(stream As Stream) As String
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Dim bytes As Byte() = stream.GZipStream.ToArray
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Dim s$ = Convert.ToBase64String(bytes)
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Return s
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End Function
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End Module
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End Namespace
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