1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
6 import java.util.zip.*;
10 // FIXME: ByteStream fileName property
11 /** base class for XWT resources */
12 public abstract class Res extends JS {
14 public final InputStream getInputStream() throws IOException { return getInputStream(""); }
16 public Res graft(Object newResource) { throw new JS.Exn("cannot graft onto this resource"); }
17 public Object get(Object key) { return new Ref(this, key); }
18 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
19 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
21 public abstract InputStream getInputStream(String path) throws IOException;
22 //public abstract Res addExtension(String extension);
24 public static Res stringToRes(String url) {
25 if (url.indexOf('!') != -1)
26 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
27 if (url.startsWith("http://")) return new HTTP(url);
28 if (url.startsWith("https://")) return new HTTP(url);
29 if (url.startsWith("file:")) return new File(url.substring(5));
30 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
31 throw new JS.Exn("invalid resource specifier");
34 /** HTTP or HTTPS resource */
35 public static class HTTP extends Res {
37 HTTP(String url) { this.url = url; }
38 public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
43 public static class File extends Res {
45 File(String path) { this.path = path; }
46 public InputStream getInputStream(String rest) throws IOException { return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
49 /** wrap a Res around a preexisting InputStream */
50 public static class IS extends Res {
52 IS(InputStream parent) { this.parent = parent; }
53 public InputStream getInputStream(String path) {
54 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
59 /** "unwrap" a Zip archive */
60 public static class Zip extends Res {
62 Zip(Res parent) { this.parent = parent; }
63 public InputStream getInputStream(String path) throws IOException {
64 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
65 ZipEntry ze = zis.getNextEntry();
66 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
67 if (ze == null) throw new JS.Exn("zip file not found in archive");
72 /** what you get when you reference a subresource */
73 public static class Ref extends Res {
76 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
77 public InputStream getInputStream(String path) throws IOException {
78 return parent.getInputStream("/" + key + path);
80 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
83 /** shadow resource which replaces the graft */
84 public static class Graft extends Res {
88 Graft(Res graftee, Object key, Object val) {
89 this.graftee = graftee; replaced_key = key; replaced_val = val; }
90 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
91 public int hashCode() { return graftee.hashCode(); }
92 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
93 public Object get(Object key) {
94 return replaced_key.equals(key) ? replaced_val : graftee.get(key);
98 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
99 public static class CAB extends Res {
101 CAB(Res parent) { this.parent = parent; }
102 private int swap_endian(int i) {
103 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
105 public InputStream getInputStream(String path) throws IOException {
106 InputStream is = parent.getInputStream();
107 byte[] scan = new byte[4];
109 for(int i=0; i<2; i++) {
110 // wierdly, .exe files have three MSCF's
111 while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
112 System.arraycopy(scan, 1, scan, 0, 3);
113 int read = is.read();
114 if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
115 scan[3] = (byte)read;
120 Log.log(this, "found MSCF header at offset " + ofs);
121 return org.xwt.util.CAB.getFileInputStream(is, path, true);
125 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
126 if (method.equals("getUTF")) {
127 if (checkOnly) return Boolean.TRUE;
128 if (args.length() != 0) return null;
130 CharArrayWriter caw = new CharArrayWriter();
131 InputStream is = getInputStream();
132 BufferedReader r = new BufferedReader(new InputStreamReader(is));
133 char[] buf = new char[1024];
135 int numread = r.read(buf, 0, 1024);
136 if (numread == -1) break;
137 caw.write(buf, 0, numread);
139 return caw.toString();
140 } catch (IOException e) {
141 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
142 if (Log.on) Log.log(Res.class, e);
143 throw new JS.Exn("error while reading from Resource");
145 } else if (method.equals("getDOM")) {
146 if (checkOnly) return Boolean.TRUE;
147 if (args.length() != 0) return null;
148 return new XMLHelper().doParse();
150 if (checkOnly) return Boolean.FALSE;
154 private class XMLHelper extends XML {
155 Vector obStack = new Vector();
156 public XMLHelper() { super(BUFFER_SIZE); }
157 public void startElement(XML.Element c) throws XML.SchemaException {
159 o.put("$name", c.localName);
160 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
161 o.put("$numchildren", new Integer(0));
162 obStack.addElement(o);
164 public void endElement(XML.Element c) throws XML.SchemaException {
165 if (obStack.size() == 1) return;
166 JS me = (JS)obStack.lastElement();
167 obStack.setSize(obStack.size() - 1);
168 JS parent = (JS)obStack.lastElement();
169 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
170 parent.put("$numchildren", new Integer(numchildren + 1));
171 parent.put(new Integer(numchildren), me);
173 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
174 String s = new String(ch, start, length);
175 JS parent = (JS)obStack.lastElement();
176 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
177 Object lastChild = parent.get(new Integer(numchildren - 1));
178 if (lastChild instanceof String) {
179 parent.put(new Integer(numchildren - 1), lastChild + s);
181 parent.put("$numchildren", new Integer(numchildren + 1));
182 parent.put(new Integer(numchildren), s);
185 public void whitespace(char[] ch, int start, int length) {}
186 public JS doParse() throws JS.Exn {
188 InputStream is = getInputStream();
189 BufferedReader r = new BufferedReader(new InputStreamReader(is));
191 } catch (XML.XMLException e) {
192 throw new JS.Exn("error parsing XML: " + e.toString());
193 } catch (IOException e) {
194 if (Log.on) Log.log(this, "IO Exception while reading from file");
195 if (Log.on) Log.log(this, e);
196 throw new JS.Exn("error reading from Resource");
198 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
202 public void writeTo(OutputStream os) throws IOException {
203 InputStream is = getInputStream();
204 byte[] buf = new byte[1024];
206 int numread = is.read(buf, 0, 1024);
207 if (numread == -1) break;
208 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
209 os.write(buf, 0, numread);
213 // we have to close this because flush() doesn't work on Win32-GCJ