Allow jagidir modules to include other compiled modules.
[jagi.git] / src / jagi / Utils.java
1 package jagi;
2
3 import java.util.*;
4 import java.io.*;
5 import java.nio.*;
6 import java.nio.channels.*;
7
8 public class Utils {
9     public static final java.nio.charset.Charset UTF8 = java.nio.charset.Charset.forName("UTF-8");
10     public static final java.nio.charset.Charset LATIN1 = java.nio.charset.Charset.forName("ISO-8859-1");
11     public static final java.nio.charset.Charset ASCII = java.nio.charset.Charset.forName("US-ASCII");
12
13     public static int read(ReadableByteChannel ch) throws IOException {
14         ByteBuffer buf = ByteBuffer.allocate(1);
15         while(true) {
16             int rv = ch.read(buf);
17             if(rv < 0)
18                 return(-1);
19             else if(rv == 1)
20                 return(buf.get(0) & 0xff);
21             else if(rv > 1)
22                 throw(new AssertionError());
23         }
24     }
25
26     public static ByteBuffer readall(ReadableByteChannel ch, ByteBuffer dst) throws IOException {
27         while(dst.remaining() > 0)
28             ch.read(dst);
29         return(dst);
30     }
31
32     public static void writeall(WritableByteChannel ch, ByteBuffer src) throws IOException {
33         while(src.remaining() > 0)
34             ch.write(src);
35     }
36
37     public static void transfer(WritableByteChannel dst, ReadableByteChannel src) throws IOException {
38         ByteBuffer buf = ByteBuffer.allocate(65536);
39         while(true) {
40             buf.clear();
41             if(src.read(buf) < 0)
42                 break;
43             buf.flip();
44             while(buf.remaining() > 0)
45                 dst.write(buf);
46         }
47     }
48
49     public static String htmlquote(CharSequence text) {
50         StringBuilder buf = new StringBuilder();
51         for(int i = 0; i < text.length(); i++) {
52             char c = text.charAt(i);
53             switch(c) {
54             case '&': buf.append("&amp;"); break;
55             case '<': buf.append("&lt;"); break;
56             case '>': buf.append("&gt;"); break;
57             case '"': buf.append("&quot;"); break;
58             default: buf.append(c); break;
59             }
60         }
61         return(buf.toString());
62     }
63
64     public static Map<Object, Object> simpleerror(int code, CharSequence title, CharSequence msg) {
65         StringBuilder buf = new StringBuilder();
66         buf.append("<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\n");
67         buf.append("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">\n");
68         buf.append("<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en-US\">\n");
69         buf.append("<head>\n");
70         buf.append("<title>" + title + "</title>\n");
71         buf.append("</head>\n");
72         buf.append("<body>\n");
73         buf.append("<h1>" + title + "</h1>\n");
74         buf.append("<p>" + htmlquote(msg) + "</p>\n");
75         buf.append("</body>\n");
76         buf.append("</html>\n");
77         ByteBuffer out = ASCII.encode(CharBuffer.wrap(buf));
78         Map<Object, Object> resp = new HashMap<>();
79         resp.put("http.status", code + " " + title);
80         resp.put("http.Content-Type", "text/html; charset=us-ascii");
81         resp.put("http.Content-Length", Integer.toString(out.remaining()));
82         resp.put("jagi.output", out);
83         return(resp);
84     }
85 }