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"); }
18 private Hash refCache = null;
19 public Object get(Object key) {
23 //who = addExtension(".xwt");
24 // FIXME: cache templates by the Res that created them, not their nodename
25 Template.buildTemplate(who.getInputStream(), "Resource");
26 // FIXME: return the static here
28 } catch (IOException e) {
33 Object ret = refCache == null ? null : refCache.get(key);
34 if (ret != null) return ret;
35 ret = new Ref(this, key);
36 if (refCache == null) refCache = new Hash();
37 refCache.put(key, ret);
41 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
42 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
44 public abstract InputStream getInputStream(String path) throws IOException;
45 //public abstract Res addExtension(String extension);
47 public static Res stringToRes(String url) {
48 if (url.indexOf('!') != -1)
49 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
50 if (url.startsWith("http://")) return new HTTP(url);
51 if (url.startsWith("https://")) return new HTTP(url);
52 if (url.startsWith("file:")) return new File(url.substring(5));
53 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
54 throw new JS.Exn("invalid resource specifier");
57 /** HTTP or HTTPS resource */
58 public static class HTTP extends Res {
60 HTTP(String url) { this.url = url; }
61 public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
66 public static class File extends Res {
68 File(String path) { this.path = path; }
69 public InputStream getInputStream(String rest) throws IOException { return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
72 /** wrap a Res around a preexisting InputStream */
73 public static class IS extends Res {
75 IS(InputStream parent) { this.parent = parent; }
76 public InputStream getInputStream(String path) {
77 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
82 /** "unwrap" a Zip archive */
83 public static class Zip extends Res {
85 Zip(Res parent) { this.parent = parent; }
86 public InputStream getInputStream(String path) throws IOException {
87 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
88 ZipEntry ze = zis.getNextEntry();
89 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
90 if (ze == null) throw new JS.Exn("zip file not found in archive");
95 /** what you get when you reference a subresource */
96 public static class Ref extends Res {
99 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
100 public InputStream getInputStream(String path) throws IOException {
101 return parent.getInputStream("/" + key + path);
103 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
106 /** shadow resource which replaces the graft */
107 public static class Graft extends Res {
111 Graft(Res graftee, Object key, Object val) {
112 this.graftee = graftee; replaced_key = key; replaced_val = val; }
113 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
114 public int hashCode() { return graftee.hashCode(); }
115 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
116 public Object get(Object key) {
117 return replaced_key.equals(key) ? replaced_val : graftee.get(key);
121 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
122 public static class CAB extends Res {
124 CAB(Res parent) { this.parent = parent; }
125 private int swap_endian(int i) {
126 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
128 public InputStream getInputStream(String path) throws IOException {
129 InputStream is = parent.getInputStream();
130 byte[] scan = new byte[4];
132 for(int i=0; i<2; i++) {
133 // wierdly, .exe files have three MSCF's
134 while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
135 System.arraycopy(scan, 1, scan, 0, 3);
136 int read = is.read();
137 if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
138 scan[3] = (byte)read;
143 Log.log(this, "found MSCF header at offset " + ofs);
144 return org.xwt.util.CAB.getFileInputStream(is, path, true);
148 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
149 if (method.equals("getUTF")) {
150 if (checkOnly) return Boolean.TRUE;
151 if (args.length() != 0) return null;
153 CharArrayWriter caw = new CharArrayWriter();
154 InputStream is = getInputStream();
155 BufferedReader r = new BufferedReader(new InputStreamReader(is));
156 char[] buf = new char[1024];
158 int numread = r.read(buf, 0, 1024);
159 if (numread == -1) break;
160 caw.write(buf, 0, numread);
162 return caw.toString();
163 } catch (IOException e) {
164 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
165 if (Log.on) Log.log(Res.class, e);
166 throw new JS.Exn("error while reading from Resource");
168 } else if (method.equals("getDOM")) {
169 if (checkOnly) return Boolean.TRUE;
170 if (args.length() != 0) return null;
171 return new XMLHelper().doParse();
173 if (checkOnly) return Boolean.FALSE;
177 private class XMLHelper extends XML {
178 Vector obStack = new Vector();
179 public XMLHelper() { super(BUFFER_SIZE); }
180 public void startElement(XML.Element c) throws XML.SchemaException {
182 o.put("$name", c.localName);
183 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
184 o.put("$numchildren", new Integer(0));
185 obStack.addElement(o);
187 public void endElement(XML.Element c) throws XML.SchemaException {
188 if (obStack.size() == 1) return;
189 JS me = (JS)obStack.lastElement();
190 obStack.setSize(obStack.size() - 1);
191 JS parent = (JS)obStack.lastElement();
192 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
193 parent.put("$numchildren", new Integer(numchildren + 1));
194 parent.put(new Integer(numchildren), me);
196 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
197 String s = new String(ch, start, length);
198 JS parent = (JS)obStack.lastElement();
199 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
200 Object lastChild = parent.get(new Integer(numchildren - 1));
201 if (lastChild instanceof String) {
202 parent.put(new Integer(numchildren - 1), lastChild + s);
204 parent.put("$numchildren", new Integer(numchildren + 1));
205 parent.put(new Integer(numchildren), s);
208 public void whitespace(char[] ch, int start, int length) {}
209 public JS doParse() throws JS.Exn {
211 InputStream is = getInputStream();
212 BufferedReader r = new BufferedReader(new InputStreamReader(is));
214 } catch (XML.XMLException e) {
215 throw new JS.Exn("error parsing XML: " + e.toString());
216 } catch (IOException e) {
217 if (Log.on) Log.log(this, "IO Exception while reading from file");
218 if (Log.on) Log.log(this, e);
219 throw new JS.Exn("error reading from Resource");
221 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
225 public void writeTo(OutputStream os) throws IOException {
226 InputStream is = getInputStream();
227 byte[] buf = new byte[1024];
229 int numread = is.read(buf, 0, 1024);
230 if (numread == -1) break;
231 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
232 os.write(buf, 0, numread);
236 // we have to close this because flush() doesn't work on Win32-GCJ