dagon.core.vfs source code

1 /*
2 Copyright (c) 2017-2018 Timur Gafarov
3 
4 Boost Software License - Version 1.0 - August 17th, 2003
5 Permission is hereby granted, free of charge, to any person or organization
6 obtaining a copy of the software and accompanying documentation covered by
7 this license (the "Software") to use, reproduce, display, distribute,
8 execute, and transmit the Software, and to prepare derivative works of the
9 Software, and to permit third-parties to whom the Software is furnished to
10 do so, all subject to the following:
11 
12 The copyright notices in the Software and this entire statement, including
13 the above license grant, this restriction and the following disclaimer,
14 must be included in all copies of the Software, in whole or in part, and
15 all derivative works of the Software, unless such copies or derivative
16 works are solely in the form of machine-executable object code generated by
17 a source language processor.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
22 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
23 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
24 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 DEALINGS IN THE SOFTWARE.
26 */
27 
28 module dagon.core.vfs;
29 
30 import std.string;
31 import std.path;
32 import dlib.core.memory;
33 import dlib.core.stream;
34 import dlib.container.array;
35 import dlib.container.dict;
36 import dlib.filesystem.filesystem;
37 import dlib.filesystem.stdfs;
38 
39 class StdDirFileSystem: ReadOnlyFileSystem
40 {
41     StdFileSystem stdfs;
42     string rootDir;
43 
44     this(string rootDir)
45     {
46         this.rootDir = rootDir;
47         stdfs = New!StdFileSystem();
48     }
49 
50     bool stat(string filename, out FileStat stat)
51     {
52         string path = format("%s/%s", rootDir, filename);
53         return stdfs.stat(path, stat);
54     }
55 
56     InputStream openForInput(string filename)
57     {
58         string path = format("%s/%s", rootDir, filename);
59         return stdfs.openForInput(path);
60     }
61 
62     Directory openDir(string dir)
63     {
64         string path = format("%s/%s", rootDir, dir);
65         return stdfs.openDir(path);
66     }
67 
68     ~this()
69     {
70         Delete(stdfs);
71     }
72 }
73 
74 class VirtualFileSystem: ReadOnlyFileSystem
75 {
76     DynamicArray!ReadOnlyFileSystem mounted;
77 
78     this()
79     {
80     }
81 
82     void mount(string dir)
83     {
84         StdDirFileSystem fs = New!StdDirFileSystem(dir);
85         mounted.append(fs);
86     }
87 
88     void mount(ReadOnlyFileSystem fs)
89     {
90         mounted.append(fs);
91     }
92 
93     string containingDir(string filename)
94     {
95         string res;
96         foreach(i, fs; mounted)
97         {
98             if (cast(StdDirFileSystem)fs)
99             {
100                 FileStat s;
101                 if (fs.stat(filename, s))
102                 {
103                     res = (cast(StdDirFileSystem)fs).rootDir;
104                     break;
105                 }
106             }
107         }
108         return res;
109     }
110 
111     bool stat(string filename, out FileStat stat)
112     {
113         bool res = false;
114         foreach(i, fs; mounted)
115         {
116             FileStat s;
117             if (fs.stat(filename, s))
118             {
119                 stat = s;
120                 res = true;
121                 break;
122             }
123         }
124 
125         return res;
126     }
127 
128     InputStream openForInput(string filename)
129     {
130         foreach(i, fs; mounted)
131         {
132             FileStat s;
133             if (fs.stat(filename, s))
134             {
135                 return fs.openForInput(filename);
136             }
137         }
138 
139         return null;
140     }
141 
142     Directory openDir(string path)
143     {
144         // TODO
145         return null;
146     }
147 
148     ~this()
149     {
150         foreach(i, fs; mounted)
151             Delete(fs);
152         mounted.free();
153     }
154 }