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) {
20 Object ret = refCache == null ? null : refCache.get(key);
21 if (ret != null) return ret;
22 ret = new Ref(this, key);
23 if (refCache == null) refCache = new Hash();
24 refCache.put(key, ret);
28 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
29 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
31 public abstract InputStream getInputStream(String path) throws IOException;
32 //public abstract Res addExtension(String extension);
34 public static Res stringToRes(String url) {
35 if (url.indexOf('!') != -1)
36 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
37 if (url.startsWith("http://")) return new HTTP(url);
38 if (url.startsWith("https://")) return new HTTP(url);
39 if (url.startsWith("file:")) return new File(url.substring(5));
40 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
41 throw new JS.Exn("invalid resource specifier");
44 /** HTTP or HTTPS resource */
45 public static class HTTP extends Res {
47 HTTP(String url) { this.url = url; }
48 public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
53 public static class File extends Res {
55 File(String path) { this.path = path; }
56 public InputStream getInputStream(String rest) throws IOException { return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
59 /** wrap a Res around a preexisting InputStream */
60 public static class IS extends Res {
62 IS(InputStream parent) { this.parent = parent; }
63 public InputStream getInputStream(String path) {
64 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
69 /** "unwrap" a Zip archive */
70 public static class Zip extends Res {
72 Zip(Res parent) { this.parent = parent; }
73 public InputStream getInputStream(String path) throws IOException {
74 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
75 ZipEntry ze = zis.getNextEntry();
76 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
77 if (ze == null) throw new JS.Exn("zip file not found in archive");
82 /** what you get when you reference a subresource */
83 public static class Ref extends Res {
86 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
87 public InputStream getInputStream(String path) throws IOException {
88 return parent.getInputStream("/" + key + path);
90 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
93 /** shadow resource which replaces the graft */
94 public static class Graft extends Res {
98 Graft(Res graftee, Object key, Object val) {
99 this.graftee = graftee; replaced_key = key; replaced_val = val; }
100 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
101 public int hashCode() { return graftee.hashCode(); }
102 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
103 public Object get(Object key) {
104 return replaced_key.equals(key) ? replaced_val : graftee.get(key);
108 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
109 public static class CAB extends Res {
111 CAB(Res parent) { this.parent = parent; }
112 private int swap_endian(int i) {
113 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
115 public InputStream getInputStream(String path) throws IOException {
116 InputStream is = parent.getInputStream();
117 byte[] scan = new byte[4];
119 for(int i=0; i<2; i++) {
120 // wierdly, .exe files have three MSCF's
121 while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
122 System.arraycopy(scan, 1, scan, 0, 3);
123 int read = is.read();
124 if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
125 scan[3] = (byte)read;
130 Log.log(this, "found MSCF header at offset " + ofs);
131 return org.xwt.util.CAB.getFileInputStream(is, path, true);
135 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
136 if (method.equals("getUTF")) {
137 if (checkOnly) return Boolean.TRUE;
138 if (args.length() != 0) return null;
140 CharArrayWriter caw = new CharArrayWriter();
141 InputStream is = getInputStream();
142 BufferedReader r = new BufferedReader(new InputStreamReader(is));
143 char[] buf = new char[1024];
145 int numread = r.read(buf, 0, 1024);
146 if (numread == -1) break;
147 caw.write(buf, 0, numread);
149 return caw.toString();
150 } catch (IOException e) {
151 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
152 if (Log.on) Log.log(Res.class, e);
153 throw new JS.Exn("error while reading from Resource");
155 } else if (method.equals("getDOM")) {
156 if (checkOnly) return Boolean.TRUE;
157 if (args.length() != 0) return null;
158 return new XMLHelper().doParse();
160 if (checkOnly) return Boolean.FALSE;
164 private class XMLHelper extends XML {
165 Vector obStack = new Vector();
166 public XMLHelper() { super(BUFFER_SIZE); }
167 public void startElement(XML.Element c) throws XML.SchemaException {
169 o.put("$name", c.localName);
170 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
171 o.put("$numchildren", new Integer(0));
172 obStack.addElement(o);
174 public void endElement(XML.Element c) throws XML.SchemaException {
175 if (obStack.size() == 1) return;
176 JS me = (JS)obStack.lastElement();
177 obStack.setSize(obStack.size() - 1);
178 JS parent = (JS)obStack.lastElement();
179 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
180 parent.put("$numchildren", new Integer(numchildren + 1));
181 parent.put(new Integer(numchildren), me);
183 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
184 String s = new String(ch, start, length);
185 JS parent = (JS)obStack.lastElement();
186 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
187 Object lastChild = parent.get(new Integer(numchildren - 1));
188 if (lastChild instanceof String) {
189 parent.put(new Integer(numchildren - 1), lastChild + s);
191 parent.put("$numchildren", new Integer(numchildren + 1));
192 parent.put(new Integer(numchildren), s);
195 public void whitespace(char[] ch, int start, int length) {}
196 public JS doParse() throws JS.Exn {
198 InputStream is = getInputStream();
199 BufferedReader r = new BufferedReader(new InputStreamReader(is));
201 } catch (XML.XMLException e) {
202 throw new JS.Exn("error parsing XML: " + e.toString());
203 } catch (IOException e) {
204 if (Log.on) Log.log(this, "IO Exception while reading from file");
205 if (Log.on) Log.log(this, e);
206 throw new JS.Exn("error reading from Resource");
208 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
212 public void writeTo(OutputStream os) throws IOException {
213 InputStream is = getInputStream();
214 byte[] buf = new byte[1024];
216 int numread = is.read(buf, 0, 1024);
217 if (numread == -1) break;
218 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
219 os.write(buf, 0, numread);
223 // we have to close this because flush() doesn't work on Win32-GCJ