1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
6 import java.util.zip.*;
9 import org.bouncycastle.util.encoders.Base64;
11 /** base class for XWT resources */
12 public abstract class Res extends JS {
14 public String getDescriptiveName() { return ""; }
16 /** cache of subresources so that the equality operator works on them */
17 private Hash refCache = null;
19 public Template t = null;
21 public Res getParent() { return null; }
23 /** returns an InputStream containing the Resource's contents */
24 public InputStream getInputStream() throws IOException { return getInputStream(""); }
25 public abstract InputStream getInputStream(String path) throws IOException;
27 /** graft newResource in place of this resource on its parent */
28 public Res graft(Object newResource) { throw new JS.Exn("cannot graft onto this resource"); }
30 /** if the path of this resource does not end with extension, return a new one wit it appended */
31 public Res addExtension(String extension) { return new Ref(this, extension); }
33 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
34 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
35 public Object get(Object key) {
37 Template t = Template.getTemplate(addExtension(".xwt"));
38 return t == null ? null : t.getStatic();
40 Object ret = refCache == null ? null : refCache.get(key);
41 if (ret != null) return ret;
42 ret = new Ref(this, key);
43 if (refCache == null) refCache = new Hash();
44 refCache.put(key, ret);
48 public static Res stringToRes(String url) { return stringToRes(url, false); }
49 public static Res stringToRes(String url, boolean permitLocalFilesystem) {
50 if (url.indexOf('!') != -1)
51 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
52 if (url.startsWith("http://")) return new HTTP(url);
53 if (url.startsWith("https://")) return new HTTP(url);
54 if (url.startsWith("file:") && permitLocalFilesystem) return new File(url.substring(5));
55 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
56 if (url.startsWith("data:")) return new ByteArray(Base64.decode(url.substring(5)));
57 throw new JS.Exn("invalid resource specifier " + url);
60 /** HTTP or HTTPS resource */
61 public static class HTTP extends Res {
63 HTTP(String url) { this.url = url; }
64 public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
68 public static class ByteArray extends Res {
70 ByteArray(byte[] bytes) { this.bytes = bytes; }
71 public InputStream getInputStream(String path) throws IOException {
72 if (!"".equals(path)) throw new JS.Exn("can't get subresources of a byte[] resource");
73 return new ByteArrayInputStream(bytes);
78 public static class File extends Res {
80 File(String path) { this.path = path; }
81 public InputStream getInputStream(String rest) throws IOException {
82 return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
85 /** wrap a Res around a preexisting InputStream */
86 public static class IS extends Res {
88 IS(InputStream parent) { this.parent = parent; }
89 public InputStream getInputStream(String path) {
90 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
95 /** "unwrap" a Zip archive */
96 public static class Zip extends Res {
98 Zip(Res parent) { this.parent = parent; }
99 public InputStream getInputStream(String path) throws IOException {
100 if (path.startsWith("/")) path = path.substring(1);
101 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
102 ZipEntry ze = zis.getNextEntry();
103 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
104 if (ze == null) throw new JS.Exn("requested file not found in archive");
109 /** what you get when you reference a subresource */
110 public static class Ref extends Res {
113 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
114 public String getDescriptiveName() {
115 String pdn = parent.getDescriptiveName();
116 return pdn.equals("") ? key.toString() : (pdn + "." + key.toString());
118 public Res addExtension(String extension) {
119 return (key instanceof String && ((String)key).endsWith(extension)) ? this : new Ref(parent, key + extension);
121 public InputStream getInputStream(String path) throws IOException {
122 return parent.getInputStream("/" + key + path);
124 public Res getParent() { return parent; }
125 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
128 /** shadow resource which replaces the graft */
129 public static class Graft extends Res {
133 Graft(Res graftee, Object key, Object val) { this.graftee = graftee; replaced_key = key; replaced_val = val; }
134 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
135 public int hashCode() { return graftee.hashCode(); }
136 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
137 public Object get(Object key) { return replaced_key.equals(key) ? replaced_val : graftee.get(key); }
138 public String getDescriptiveName() { return graftee.getDescriptiveName(); }
139 public Res getParent() { return graftee.getParent(); }
142 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
143 public static class CAB extends Res {
145 CAB(Res parent) { this.parent = parent; }
146 private int swap_endian(int i) {
147 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
149 public InputStream getInputStream(String path) throws IOException {
150 InputStream is = parent.getInputStream();
151 byte[] scan = new byte[4];
153 for(int i=0; i<2; i++) {
154 // wierdly, .exe files have three MSCF's
155 while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
156 System.arraycopy(scan, 1, scan, 0, 3);
157 int read = is.read();
158 if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
159 scan[3] = (byte)read;
164 Log.log(this, "found MSCF header at offset " + ofs);
165 return org.xwt.util.CAB.getFileInputStream(is, path, true);
169 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
170 if (method.equals("getUTF")) {
171 if (checkOnly) return Boolean.TRUE;
172 if (args.length() != 0) return null;
174 CharArrayWriter caw = new CharArrayWriter();
175 InputStream is = getInputStream();
176 BufferedReader r = new BufferedReader(new InputStreamReader(is));
177 char[] buf = new char[1024];
179 int numread = r.read(buf, 0, 1024);
180 if (numread == -1) break;
181 caw.write(buf, 0, numread);
183 return caw.toString();
184 } catch (IOException e) {
185 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
186 if (Log.on) Log.log(Res.class, e);
187 throw new JS.Exn("error while reading from Resource");
189 } else if (method.equals("getDOM")) {
190 if (checkOnly) return Boolean.TRUE;
191 if (args.length() != 0) return null;
192 return new XMLHelper().doParse();
194 if (checkOnly) return Boolean.FALSE;
198 private class XMLHelper extends XML {
199 Vector obStack = new Vector();
200 public XMLHelper() { super(BUFFER_SIZE); }
201 public void startElement(XML.Element c) throws XML.SchemaException {
203 o.put("$name", c.localName);
204 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
205 o.put("$numchildren", new Integer(0));
206 obStack.addElement(o);
208 public void endElement(XML.Element c) throws XML.SchemaException {
209 if (obStack.size() == 1) return;
210 JS me = (JS)obStack.lastElement();
211 obStack.setSize(obStack.size() - 1);
212 JS parent = (JS)obStack.lastElement();
213 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
214 parent.put("$numchildren", new Integer(numchildren + 1));
215 parent.put(new Integer(numchildren), me);
217 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
218 String s = new String(ch, start, length);
219 JS parent = (JS)obStack.lastElement();
220 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
221 Object lastChild = parent.get(new Integer(numchildren - 1));
222 if (lastChild instanceof String) {
223 parent.put(new Integer(numchildren - 1), lastChild + s);
225 parent.put("$numchildren", new Integer(numchildren + 1));
226 parent.put(new Integer(numchildren), s);
229 public void whitespace(char[] ch, int start, int length) {}
230 public JS doParse() throws JS.Exn {
232 InputStream is = getInputStream();
233 BufferedReader r = new BufferedReader(new InputStreamReader(is));
235 } catch (XML.XMLException e) {
236 throw new JS.Exn("error parsing XML: " + e.toString());
237 } catch (IOException e) {
238 if (Log.on) Log.log(this, "IO Exception while reading from file");
239 if (Log.on) Log.log(this, e);
240 throw new JS.Exn("error reading from Resource");
242 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
246 public void writeTo(OutputStream os) throws IOException {
247 InputStream is = getInputStream();
248 byte[] buf = new byte[1024];
250 int numread = is.read(buf, 0, 1024);
251 if (numread == -1) break;
252 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
253 os.write(buf, 0, numread);
257 // we have to close this because flush() doesn't work on Win32-GCJ