1 | #Region "Microsoft.VisualBasic::91762bbb449e95456d3322a02d642d4e, Microsoft.VisualBasic.Core\Net\HTTP\ZipStream.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Module ZipStreamExtensions |
35 | ' |
36 | ' Function: UnZipStream |
37 | ' |
38 | ' |
39 | ' /********************************************************************************/ |
40 | |
41 | #End Region |
42 | |
43 | Imports System.IO |
44 | Imports System.IO.Compression |
45 | Imports System.Runtime.CompilerServices |
46 | Imports Microsoft.VisualBasic.Linq |
47 | |
48 | Namespace Net.Http |
49 | |
50 | Public Module ZipStreamExtensions |
51 | |
52 | ''' <summary> |
53 | ''' 进行zlib数据流的zip解压缩 |
54 | ''' |
55 | ''' > https://bbs.csdn.net/topics/392275364 |
56 | ''' </summary> |
57 | ''' <param name="stream"></param> |
58 | ''' <returns></returns> |
59 | ''' <remarks> |
60 | ''' ###### 2018-11-15 经过测试,没有bug,与zlibnet的测试结果一致 |
61 | ''' </remarks> |
62 | <Extension> |
63 | Public Function UnZipStream(stream As IEnumerable(Of Byte)) As MemoryStream |
64 | Dim pBytes = stream.SafeQuery.ToArray |
65 | |
66 | ' Deflate 算法压缩之后的数据,第一个字节是 78h(120b),第二个字节是 DAh(218b) |
67 | If pBytes.Length < 2 OrElse (Not pBytes(0) = 120 AndAlso Not pBytes(1) = 218) Then |
68 | Return New MemoryStream(pBytes) |
69 | End If |
70 | |
71 | Using compress As New MemoryStream(pBytes) |
72 | Dim deflatMs As New MemoryStream() |
73 | |
74 | ' 先读取前两个deflate压缩算法标识字节,然后才能用deflateStream解压 |
75 | ' 这个行为与 zlib库、sharpZiplib库等不同(这些库都是直接传入解压) |
76 | compress.ReadByte() |
77 | compress.ReadByte() |
78 | |
79 | Using deflatestream As New DeflateStream(compress, CompressionMode.Decompress, False) |
80 | deflatestream.CopyTo(deflatMs, 8192) |
81 | End Using |
82 | |
83 | Return deflatMs |
84 | End Using |
85 | End Function |
86 | End Module |
87 | End Namespace |