| 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 |