1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
6 import java.util.zip.*;
10 /** base class for XWT resources */
11 public abstract class Res extends JS {
13 public String getDescriptiveName() { return ""; }
15 /** cache of subresources so that the equality operator works on them */
16 private Hash refCache = null;
18 public Template t = null;
20 public Res getParent() { return null; }
22 /** returns an InputStream containing the Resource's contents */
23 public InputStream getInputStream() throws IOException { return getInputStream(""); }
24 public abstract InputStream getInputStream(String path) throws IOException;
26 /** graft newResource in place of this resource on its parent */
27 public Res graft(Object newResource) { throw new JS.Exn("cannot graft onto this resource"); }
29 /** if the path of this resource does not end with extension, return a new one wit it appended */
30 public Res addExtension(String extension) { return new Ref(this, extension); }
32 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
33 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
34 public Object get(Object key) {
36 Template t = Template.getTemplate(addExtension(".xwt"));
37 return t == null ? null : t.getStatic();
39 Object ret = refCache == null ? null : refCache.get(key);
40 if (ret != null) return ret;
41 ret = new Ref(this, key);
42 if (refCache == null) refCache = new Hash();
43 refCache.put(key, ret);
47 public static Res stringToRes(String url) { return stringToRes(url, false); }
48 public static Res stringToRes(String url, boolean permitLocalFilesystem) {
49 if (url.indexOf('!') != -1)
50 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
51 if (url.startsWith("http://")) return new HTTP(url);
52 if (url.startsWith("https://")) return new HTTP(url);
53 if (url.startsWith("file:") && permitLocalFilesystem) return new File(url.substring(5));
54 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
55 throw new JS.Exn("invalid resource specifier " + url);
58 /** HTTP or HTTPS resource */
59 public static class HTTP extends Res {
61 HTTP(String url) { this.url = url; }
62 public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
66 public static class ByteArray extends Res {
68 ByteArray(byte[] bytes) { this.bytes = bytes; }
69 public InputStream getInputStream(String path) throws IOException {
70 if (!"".equals(path)) throw new JS.Exn("can't get subresources of a byte[] resource");
71 return new ByteArrayInputStream(bytes);
76 public static class File extends Res {
78 File(String path) { this.path = path; }
79 public InputStream getInputStream(String rest) throws IOException {
80 return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
83 /** wrap a Res around a preexisting InputStream */
84 public static class IS extends Res {
86 IS(InputStream parent) { this.parent = parent; }
87 public InputStream getInputStream(String path) {
88 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
93 /** "unwrap" a Zip archive */
94 public static class Zip extends Res {
96 Zip(Res parent) { this.parent = parent; }
97 public InputStream getInputStream(String path) throws IOException {
98 if (path.startsWith("/")) path = path.substring(1);
99 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
100 ZipEntry ze = zis.getNextEntry();
101 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
102 if (ze == null) throw new JS.Exn("requested file not found in archive");
107 /** what you get when you reference a subresource */
108 public static class Ref extends Res {
111 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
112 public String getDescriptiveName() {
113 String pdn = parent.getDescriptiveName();
114 return pdn.equals("") ? key.toString() : (pdn + "." + key.toString());
116 public Res addExtension(String extension) {
117 return (key instanceof String && ((String)key).endsWith(extension)) ? this : new Ref(parent, key + extension);
119 public InputStream getInputStream(String path) throws IOException {
120 return parent.getInputStream("/" + key + path);
122 public Res getParent() { return parent; }
123 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
126 /** shadow resource which replaces the graft */
127 public static class Graft extends Res {
131 Graft(Res graftee, Object key, Object val) { this.graftee = graftee; replaced_key = key; replaced_val = val; }
132 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
133 public int hashCode() { return graftee.hashCode(); }
134 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
135 public Object get(Object key) { return replaced_key.equals(key) ? replaced_val : graftee.get(key); }
136 public String getDescriptiveName() { return graftee.getDescriptiveName(); }
137 public Res getParent() { return graftee.getParent(); }
140 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
141 public static class CAB extends Res {
143 CAB(Res parent) { this.parent = parent; }
144 private int swap_endian(int i) {
145 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
147 public InputStream getInputStream(String path) throws IOException {
148 InputStream is = parent.getInputStream();
149 byte[] scan = new byte[4];
151 for(int i=0; i<2; i++) {
152 // wierdly, .exe files have three MSCF's
153 while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
154 System.arraycopy(scan, 1, scan, 0, 3);
155 int read = is.read();
156 if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
157 scan[3] = (byte)read;
162 Log.log(this, "found MSCF header at offset " + ofs);
163 return org.xwt.util.CAB.getFileInputStream(is, path, true);
167 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
168 if (method.equals("getUTF")) {
169 if (checkOnly) return Boolean.TRUE;
170 if (args.length() != 0) return null;
172 CharArrayWriter caw = new CharArrayWriter();
173 InputStream is = getInputStream();
174 BufferedReader r = new BufferedReader(new InputStreamReader(is));
175 char[] buf = new char[1024];
177 int numread = r.read(buf, 0, 1024);
178 if (numread == -1) break;
179 caw.write(buf, 0, numread);
181 return caw.toString();
182 } catch (IOException e) {
183 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
184 if (Log.on) Log.log(Res.class, e);
185 throw new JS.Exn("error while reading from Resource");
187 } else if (method.equals("getDOM")) {
188 if (checkOnly) return Boolean.TRUE;
189 if (args.length() != 0) return null;
190 return new XMLHelper().doParse();
192 if (checkOnly) return Boolean.FALSE;
196 private class XMLHelper extends XML {
197 Vector obStack = new Vector();
198 public XMLHelper() { super(BUFFER_SIZE); }
199 public void startElement(XML.Element c) throws XML.SchemaException {
201 o.put("$name", c.localName);
202 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
203 o.put("$numchildren", new Integer(0));
204 obStack.addElement(o);
206 public void endElement(XML.Element c) throws XML.SchemaException {
207 if (obStack.size() == 1) return;
208 JS me = (JS)obStack.lastElement();
209 obStack.setSize(obStack.size() - 1);
210 JS parent = (JS)obStack.lastElement();
211 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
212 parent.put("$numchildren", new Integer(numchildren + 1));
213 parent.put(new Integer(numchildren), me);
215 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
216 String s = new String(ch, start, length);
217 JS parent = (JS)obStack.lastElement();
218 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
219 Object lastChild = parent.get(new Integer(numchildren - 1));
220 if (lastChild instanceof String) {
221 parent.put(new Integer(numchildren - 1), lastChild + s);
223 parent.put("$numchildren", new Integer(numchildren + 1));
224 parent.put(new Integer(numchildren), s);
227 public void whitespace(char[] ch, int start, int length) {}
228 public JS doParse() throws JS.Exn {
230 InputStream is = getInputStream();
231 BufferedReader r = new BufferedReader(new InputStreamReader(is));
233 } catch (XML.XMLException e) {
234 throw new JS.Exn("error parsing XML: " + e.toString());
235 } catch (IOException e) {
236 if (Log.on) Log.log(this, "IO Exception while reading from file");
237 if (Log.on) Log.log(this, e);
238 throw new JS.Exn("error reading from Resource");
240 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
244 public void writeTo(OutputStream os) throws IOException {
245 InputStream is = getInputStream();
246 byte[] buf = new byte[1024];
248 int numread = is.read(buf, 0, 1024);
249 if (numread == -1) break;
250 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
251 os.write(buf, 0, numread);
255 // we have to close this because flush() doesn't work on Win32-GCJ