1 | #Region "Microsoft.VisualBasic::ceb6354319261aae8d03df0bc8bc2aac, Microsoft.VisualBasic.Core\Net\HTTP\DataURI.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 | ' Class DataURI |
35 | ' |
36 | ' Properties: base64, chartSet, mime |
37 | ' |
38 | ' Constructor: (+3 Overloads) Sub New |
39 | ' Function: FromFile, SVGImage, ToStream, ToString, URIParser |
40 | ' |
41 | ' |
42 | ' /********************************************************************************/ |
43 | |
44 | #End Region |
45 | |
46 | Imports System.Drawing |
47 | Imports System.IO |
48 | Imports System.Runtime.CompilerServices |
49 | Imports Microsoft.VisualBasic.ApplicationServices |
50 | Imports Microsoft.VisualBasic.Net.Protocols |
51 | Imports Microsoft.VisualBasic.Text |
52 | |
53 | Namespace Net.Http |
54 | |
55 | ''' <summary> |
56 | ''' Data URI scheme |
57 | ''' </summary> |
58 | Public Class DataURI |
59 | |
60 | ''' <summary> |
61 | ''' File mime type |
62 | ''' </summary> |
63 | Public ReadOnly Property mime As String |
64 | ''' <summary> |
65 | ''' The base64 string |
66 | ''' </summary> |
67 | Public ReadOnly Property base64 As String |
68 | Public ReadOnly Property chartSet As String |
69 | |
70 | ''' <summary> |
71 | ''' |
72 | ''' </summary> |
73 | ''' <param name="file"></param> |
74 | ''' <param name="codepage$"> |
75 | ''' The chartset codepage name, by default is ``ASCII``. |
76 | ''' </param> |
77 | Sub New(file$, Optional codepage$ = Nothing) |
78 | mime = Strings.LCase(file.FileMimeType.MIMEType) |
79 | base64 = file.ReadBinary.ToBase64String |
80 | codepage = codepage |
81 | End Sub |
82 | |
83 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
84 | Sub New(image As Image) |
85 | Call Me.New(image.ToBase64String, ContentTypes.MIME.Png, Nothing) |
86 | End Sub |
87 | |
88 | Public Sub New(base64$, mine$, Optional charset$ = Nothing) |
89 | Me.base64 = base64 |
90 | Me.mime = mime |
91 | Me.chartSet = charset |
92 | End Sub |
93 | |
94 | ''' <summary> |
95 | ''' <see cref="Convert.FromBase64String"/> |
96 | ''' </summary> |
97 | ''' <returns></returns> |
98 | Public Function ToStream() As Stream |
99 | Return New MemoryStream(Convert.FromBase64String(base64)) |
100 | End Function |
101 | |
102 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
103 | Public Shared Function FromFile(file As String) As DataURI |
104 | Return New DataURI(file) |
105 | End Function |
106 | |
107 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
108 | Public Shared Function SVGImage(svg As String) As DataURI |
109 | Return New DataURI(base64:=TextEncodings.UTF8WithoutBOM.GetBytes(svg).ToBase64String, mine:="image/svg+xml") |
110 | End Function |
111 | |
112 | Public Shared Function URIParser(uri As String) As DataURI |
113 | Dim t = uri.Split(";"c) _ |
114 | .Select(Function(p) p.StringSplit("[:=,]")) _ |
115 | .ToDictionary(Function(k) k(0).ToLower, |
116 | Function(value) value(1)) |
117 | |
118 | Return New DataURI( |
119 | base64:=t.TryGetValue("base64"), |
120 | charset:=t.TryGetValue("charset"), |
121 | mine:=t.TryGetValue("data") |
122 | ) |
123 | End Function |
124 | |
125 | ''' <summary> |
126 | ''' Output this data uri string text |
127 | ''' </summary> |
128 | ''' <returns></returns> |
129 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
130 | Public Overrides Function ToString() As String |
131 | If chartSet.StringEmpty Then |
132 | Return $"data:{mime};base64,{base64}" |
133 | Else |
134 | Return $"data:{mime};charset={chartSet};base64,{base64}" |
135 | End If |
136 | End Function |
137 | End Class |
138 | End Namespace |