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 Res getParent() { return null; }
20 /** returns an InputStream containing the Resource's contents */
21 public InputStream getInputStream() throws IOException { return getInputStream(""); }
22 public abstract InputStream getInputStream(String path) throws IOException;
24 /** graft newResource in place of this resource on its parent */
25 public Res graft(Object newResource) { throw new JS.Exn("cannot graft onto this resource"); }
27 /** if the path of this resource does not end with extension, return a new one wit it appended */
28 public Res addExtension(String extension) { return new Ref(this, extension); }
30 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
31 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
32 public Object get(Object key) {
34 Template t = Template.getTemplate(addExtension(".xwt"));
35 return t == null ? null : t.getStatic();
37 Object ret = refCache == null ? null : refCache.get(key);
38 if (ret != null) return ret;
39 ret = new Ref(this, key);
40 if (refCache == null) refCache = new Hash();
41 refCache.put(key, ret);
45 public static Res stringToRes(String url) { return stringToRes(url, false); }
46 public static Res stringToRes(String url, boolean permitLocalFilesystem) {
47 if (url.indexOf('!') != -1)
48 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
49 if (url.startsWith("http://")) return new HTTP(url);
50 if (url.startsWith("https://")) return new HTTP(url);
51 if (url.startsWith("file:") && permitLocalFilesystem) return new File(url.substring(5));
52 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
53 throw new JS.Exn("invalid resource specifier");
56 /** HTTP or HTTPS resource */
57 public static class HTTP extends Res {
59 HTTP(String url) { this.url = url; }
60 public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
64 public static class ByteArray extends Res {
66 ByteArray(byte[] bytes) { this.bytes = bytes; }
67 public InputStream getInputStream(String path) throws IOException {
68 if (!"".equals(path)) throw new JS.Exn("can't get subresources of a byte[] resource");
69 return new ByteArrayInputStream(bytes);
74 public static class File extends Res {
76 File(String path) { this.path = path; }
77 public InputStream getInputStream(String rest) throws IOException {
78 return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
81 /** wrap a Res around a preexisting InputStream */
82 public static class IS extends Res {
84 IS(InputStream parent) { this.parent = parent; }
85 public InputStream getInputStream(String path) {
86 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
91 /** "unwrap" a Zip archive */
92 public static class Zip extends Res {
94 Zip(Res parent) { this.parent = parent; }
95 public InputStream getInputStream(String path) throws IOException {
96 if (path.startsWith("/")) path = path.substring(1);
97 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
98 ZipEntry ze = zis.getNextEntry();
99 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
100 if (ze == null) throw new JS.Exn("requested file not found in archive");
105 /** what you get when you reference a subresource */
106 public static class Ref extends Res {
109 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
110 public String getDescriptiveName() {
111 String pdn = parent.getDescriptiveName();
112 return pdn.equals("") ? key.toString() : (pdn + "." + key.toString());
114 public Res addExtension(String extension) {
115 return (key instanceof String && ((String)key).endsWith(extension)) ? this : new Ref(parent, key + extension);
117 public InputStream getInputStream(String path) throws IOException {
118 return parent.getInputStream("/" + key + path);
120 public Res getParent() { return parent; }
121 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
124 /** shadow resource which replaces the graft */
125 public static class Graft extends Res {
129 Graft(Res graftee, Object key, Object val) { this.graftee = graftee; replaced_key = key; replaced_val = val; }
130 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
131 public int hashCode() { return graftee.hashCode(); }
132 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
133 public Object get(Object key) { return replaced_key.equals(key) ? replaced_val : graftee.get(key); }
134 public String getDescriptiveName() { return graftee.getDescriptiveName(); }
135 public Res getParent() { return graftee.getParent(); }
138 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
139 public static class CAB extends Res {
141 CAB(Res parent) { this.parent = parent; }
142 private int swap_endian(int i) {
143 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
145 public InputStream getInputStream(String path) throws IOException {
146 InputStream is = parent.getInputStream();
147 byte[] scan = new byte[4];
149 for(int i=0; i<2; i++) {
150 // wierdly, .exe files have three MSCF's
151 while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
152 System.arraycopy(scan, 1, scan, 0, 3);
153 int read = is.read();
154 if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
155 scan[3] = (byte)read;
160 Log.log(this, "found MSCF header at offset " + ofs);
161 return org.xwt.util.CAB.getFileInputStream(is, path, true);
165 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
166 if (method.equals("getUTF")) {
167 if (checkOnly) return Boolean.TRUE;
168 if (args.length() != 0) return null;
170 CharArrayWriter caw = new CharArrayWriter();
171 InputStream is = getInputStream();
172 BufferedReader r = new BufferedReader(new InputStreamReader(is));
173 char[] buf = new char[1024];
175 int numread = r.read(buf, 0, 1024);
176 if (numread == -1) break;
177 caw.write(buf, 0, numread);
179 return caw.toString();
180 } catch (IOException e) {
181 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
182 if (Log.on) Log.log(Res.class, e);
183 throw new JS.Exn("error while reading from Resource");
185 } else if (method.equals("getDOM")) {
186 if (checkOnly) return Boolean.TRUE;
187 if (args.length() != 0) return null;
188 return new XMLHelper().doParse();
190 if (checkOnly) return Boolean.FALSE;
194 private class XMLHelper extends XML {
195 Vector obStack = new Vector();
196 public XMLHelper() { super(BUFFER_SIZE); }
197 public void startElement(XML.Element c) throws XML.SchemaException {
199 o.put("$name", c.localName);
200 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
201 o.put("$numchildren", new Integer(0));
202 obStack.addElement(o);
204 public void endElement(XML.Element c) throws XML.SchemaException {
205 if (obStack.size() == 1) return;
206 JS me = (JS)obStack.lastElement();
207 obStack.setSize(obStack.size() - 1);
208 JS parent = (JS)obStack.lastElement();
209 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
210 parent.put("$numchildren", new Integer(numchildren + 1));
211 parent.put(new Integer(numchildren), me);
213 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
214 String s = new String(ch, start, length);
215 JS parent = (JS)obStack.lastElement();
216 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
217 Object lastChild = parent.get(new Integer(numchildren - 1));
218 if (lastChild instanceof String) {
219 parent.put(new Integer(numchildren - 1), lastChild + s);
221 parent.put("$numchildren", new Integer(numchildren + 1));
222 parent.put(new Integer(numchildren), s);
225 public void whitespace(char[] ch, int start, int length) {}
226 public JS doParse() throws JS.Exn {
228 InputStream is = getInputStream();
229 BufferedReader r = new BufferedReader(new InputStreamReader(is));
231 } catch (XML.XMLException e) {
232 throw new JS.Exn("error parsing XML: " + e.toString());
233 } catch (IOException e) {
234 if (Log.on) Log.log(this, "IO Exception while reading from file");
235 if (Log.on) Log.log(this, e);
236 throw new JS.Exn("error reading from Resource");
238 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
242 public void writeTo(OutputStream os) throws IOException {
243 InputStream is = getInputStream();
244 byte[] buf = new byte[1024];
246 int numread = is.read(buf, 0, 1024);
247 if (numread == -1) break;
248 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
249 os.write(buf, 0, numread);
253 // we have to close this because flush() doesn't work on Win32-GCJ