package org.xwt;
import java.io.*;
+import java.util.*;
+import java.util.zip.*;
+import org.xwt.js.*;
+import org.xwt.util.*;
+// FIXME: ByteStream fileName property
/** base class for XWT resources */
-public abstract class Res {
+public abstract class Res extends JS {
- public abstract InputStream getInputStream();
- public Res getSubResource(String key) { return Null.singleton; }
+ public final InputStream getInputStream() throws IOException { return getInputStream(""); }
+
+ public Res graft(Object newResource) { throw new JS.Exn("cannot graft onto this resource"); }
+
+ private Hash refCache = null;
+ public Object get(Object key) {
+ Object ret = refCache == null ? null : refCache.get(key);
+ if (ret != null) return ret;
+ ret = new Ref(this, key);
+ if (refCache == null) refCache = new Hash();
+ refCache.put(key, ret);
+ return ret;
+ }
+
+ public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
+ public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
+
+ public abstract InputStream getInputStream(String path) throws IOException;
+ //public abstract Res addExtension(String extension);
public static Res stringToRes(String url) {
- if (url.indexOf('!') == -1)
- return new Zip(stringToRes(url.substring(0, url.lastIndexOf('!'))),
- url.substring(url.lastIndexOf('!') + 1));
+ if (url.indexOf('!') != -1)
+ return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).get(url.substring(url.lastIndexOf('!') + 1)));
if (url.startsWith("http://")) return new HTTP(url);
if (url.startsWith("https://")) return new HTTP(url);
+ if (url.startsWith("file:")) return new File(url.substring(5));
+ if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
throw new JS.Exn("invalid resource specifier");
}
- /** the invalid resource; only causes an error if you actually try to use it */
- public static class Null extends Res {
- Null() { }
- private static singleton = new Null();
- public InputStream getInputStream() throws JS.Exn { throw new JS.Exn("invalid resource"); }
- }
-
/** HTTP or HTTPS resource */
public static class HTTP extends Res {
private String url;
HTTP(String url) { this.url = url; }
- public InputStream getInputStream() { return new HTTP(url).GET(); }
- public Res getSubResource(String key) { return new HTTP(url + "/" + key); }
+ public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
+ }
+
+ // FIXME: dangerous
+ /** a file */
+ public static class File extends Res {
+ private String path;
+ File(String path) { this.path = path; }
+ public InputStream getInputStream(String rest) throws IOException { return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
}
/** wrap a Res around a preexisting InputStream */
public static class IS extends Res {
InputStream parent;
IS(InputStream parent) { this.parent = parent; }
- public InputStream getInputStream() { return parent; }
+ public InputStream getInputStream(String path) {
+ if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
+ return parent;
+ }
}
/** "unwrap" a Zip archive */
public static class Zip extends Res {
private Res parent;
- private String path = "";
- Zip(Res parent, String path) { this.parent = parent; this.path = path; }
- public InputStream getInputStream() {
+ Zip(Res parent) { this.parent = parent; }
+ public InputStream getInputStream(String path) throws IOException {
ZipInputStream zis = new ZipInputStream(parent.getInputStream());
ZipEntry ze = zis.getNextEntry();
while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
if (ze == null) throw new JS.Exn("zip file not found in archive");
return zis;
}
- public Res getSubResource(String key) { return new Zip(parent, path + '/' + key); }
}
+ /** what you get when you reference a subresource */
+ public static class Ref extends Res {
+ Res parent;
+ Object key;
+ Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
+ public InputStream getInputStream(String path) throws IOException {
+ return parent.getInputStream("/" + key + path);
+ }
+ public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
+ }
+
+ /** shadow resource which replaces the graft */
+ public static class Graft extends Res {
+ Res graftee;
+ Object replaced_key;
+ Object replaced_val;
+ Graft(Res graftee, Object key, Object val) {
+ this.graftee = graftee; replaced_key = key; replaced_val = val; }
+ public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
+ public int hashCode() { return graftee.hashCode(); }
+ public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
+ public Object get(Object key) {
+ return replaced_key.equals(key) ? replaced_val : graftee.get(key);
+ }
+ }
+
+ /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
+ public static class CAB extends Res {
+ private Res parent;
+ CAB(Res parent) { this.parent = parent; }
+ private int swap_endian(int i) {
+ return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
+ }
+ public InputStream getInputStream(String path) throws IOException {
+ InputStream is = parent.getInputStream();
+ byte[] scan = new byte[4];
+ int ofs = 0;
+ for(int i=0; i<2; i++) {
+ // wierdly, .exe files have three MSCF's
+ while(scan[0] != 'M' || scan[1] != 'S' || scan[2] != 'C' || scan[3] != 'F') {
+ System.arraycopy(scan, 1, scan, 0, 3);
+ int read = is.read();
+ if (read == -1) throw new JS.Exn("MSCF header tag not found in file");
+ scan[3] = (byte)read;
+ ofs++;
+ }
+ scan[0] = 0;
+ }
+ Log.log(this, "found MSCF header at offset " + ofs);
+ return org.xwt.util.CAB.getFileInputStream(is, path, true);
+ }
+ }
+
+ public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
+ if (method.equals("getUTF")) {
+ if (checkOnly) return Boolean.TRUE;
+ if (args.length() != 0) return null;
+ try {
+ CharArrayWriter caw = new CharArrayWriter();
+ InputStream is = getInputStream();
+ BufferedReader r = new BufferedReader(new InputStreamReader(is));
+ char[] buf = new char[1024];
+ while(true) {
+ int numread = r.read(buf, 0, 1024);
+ if (numread == -1) break;
+ caw.write(buf, 0, numread);
+ }
+ return caw.toString();
+ } catch (IOException e) {
+ if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
+ if (Log.on) Log.log(Res.class, e);
+ throw new JS.Exn("error while reading from Resource");
+ }
+ } else if (method.equals("getDOM")) {
+ if (checkOnly) return Boolean.TRUE;
+ if (args.length() != 0) return null;
+ return new XMLHelper().doParse();
+ }
+ if (checkOnly) return Boolean.FALSE;
+ return null;
+ }
+
+ private class XMLHelper extends XML {
+ Vector obStack = new Vector();
+ public XMLHelper() { super(BUFFER_SIZE); }
+ public void startElement(XML.Element c) throws XML.SchemaException {
+ JS o = new JS.Obj();
+ o.put("$name", c.localName);
+ for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
+ o.put("$numchildren", new Integer(0));
+ obStack.addElement(o);
+ }
+ public void endElement(XML.Element c) throws XML.SchemaException {
+ if (obStack.size() == 1) return;
+ JS me = (JS)obStack.lastElement();
+ obStack.setSize(obStack.size() - 1);
+ JS parent = (JS)obStack.lastElement();
+ int numchildren = ((Integer)parent.get("$numchildren")).intValue();
+ parent.put("$numchildren", new Integer(numchildren + 1));
+ parent.put(new Integer(numchildren), me);
+ }
+ public void characters(char[] ch, int start, int length) throws XML.SchemaException {
+ String s = new String(ch, start, length);
+ JS parent = (JS)obStack.lastElement();
+ int numchildren = ((Integer)parent.get("$numchildren")).intValue();
+ Object lastChild = parent.get(new Integer(numchildren - 1));
+ if (lastChild instanceof String) {
+ parent.put(new Integer(numchildren - 1), lastChild + s);
+ } else {
+ parent.put("$numchildren", new Integer(numchildren + 1));
+ parent.put(new Integer(numchildren), s);
+ }
+ }
+ public void whitespace(char[] ch, int start, int length) {}
+ public JS doParse() throws JS.Exn {
+ try {
+ InputStream is = getInputStream();
+ BufferedReader r = new BufferedReader(new InputStreamReader(is));
+ parse(r);
+ } catch (XML.XMLException e) {
+ throw new JS.Exn("error parsing XML: " + e.toString());
+ } catch (IOException e) {
+ if (Log.on) Log.log(this, "IO Exception while reading from file");
+ if (Log.on) Log.log(this, e);
+ throw new JS.Exn("error reading from Resource");
+ }
+ return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
+ }
+ }
+
+ public void writeTo(OutputStream os) throws IOException {
+ InputStream is = getInputStream();
+ byte[] buf = new byte[1024];
+ while(true) {
+ int numread = is.read(buf, 0, 1024);
+ if (numread == -1) break;
+ if (Log.on) Log.log(this, "wrote " + numread + " bytes");
+ os.write(buf, 0, numread);
+ }
+ os.flush();
+
+ // we have to close this because flush() doesn't work on Win32-GCJ
+ os.close();
+ }
}
projects / org.ibex.core.git / blobdiff