Worked around some ZIP-related bugs.

src/com/sk89q/worldedit/data/TrueZipAlphaChunkStore.java

@@ -23,9 +23,11 @@ import de.schlichtherle.io.*;
 import de.schlichtherle.io.File;
 import de.schlichtherle.io.FileInputStream;
 import java.io.*;
+import java.util.regex.Pattern;
 
 /**
- * Represents the chunk store used by Minecraft alpha.
+ * Represents the chunk store used by Minecraft alpha. This driver uses
+ * TrueZip to read zip files, althoguh it currently does not work well.
  *
  * @author sk89q
  */
@@ -90,8 +92,9 @@ public class TrueZipAlphaChunkStore extends NestedFileChunkStore {
     protected InputStream getInputStream(String f1, String f2, String name)
             throws DataException, IOException {
         String file = f1 + File.separator + f2 + File.separator + name;
+        File f = new File(path, file);
         try {
-            return new FileInputStream(new File(path.getAbsolutePath(), file));
+            return new FileInputStream(f.getAbsolutePath());
         } catch (FileNotFoundException e) {
             throw new MissingChunkException();
         }
@@ -104,8 +107,10 @@ public class TrueZipAlphaChunkStore extends NestedFileChunkStore {
      * @return
      */
     private File findWorldPath(File path) {
-        if ((new File(path, "world")).exists()) {
-            return new File(path, "world");
+        File f = new File(path, "world");
+        
+        if (path.contains(f)) {
+            return f;
         }
 
         return searchForPath(path);
@@ -119,21 +124,15 @@ public class TrueZipAlphaChunkStore extends NestedFileChunkStore {
      */
     private File searchForPath(File path) {
         String[] children = path.list();
-        // listFiles() returns java.io.File[]
+        
+        Pattern pattern = Pattern.compile(".*[\\\\/]level\\.dat$");
 
         if (children == null) {
             return null;
         } else {
-            for (String child : children) {
-                File f = new File(path, child);
-                
-                if (f.isFile() && f.getName().equals("level.dat")) {
-                    return path;
-                } else if (f.isDirectory()) {
-                    File res = findWorldPath(f);
-                    if (res != null) {
-                        return res;
-                    }
+            for (String f : children) {
+                if (pattern.matcher(f).matches()) {
+                    return (File)(new File(path, f)).getParentFile();
                 }
             }
         }

src/com/sk89q/worldedit/data/TrueZipLegacyAlphaChunkStore.java

@@ -0,0 +1,166 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit.data;
+
+import java.io.*;
+import java.util.regex.Pattern;
+import java.util.zip.ZipException;
+import java.util.Enumeration;
+import de.schlichtherle.util.zip.*;
+
+/**
+ * Represents the chunk store used by Minecraft alpha but zipped. Uses
+ * the replacement classes for java.util.zip.* from TrueZip.
+ *
+ * @author sk89q
+ */
+public class TrueZipLegacyAlphaChunkStore extends NestedFileChunkStore {
+    /**
+     * ZIP file.
+     */
+    @SuppressWarnings("unused")
+    private File zipFile;
+    /**
+     * Actual ZIP.
+     */
+    private ZipFile zip;
+    /**
+     * Folder inside the ZIP file to read from, if any.
+     */
+    private String folder;
+
+    /**
+     * Create an instance. The folder argument lets you choose a folder or
+     * path to look into in the ZIP for the files. Use a blank string for
+     * the folder to not look into a subdirectory.
+     *
+     * @param zipFile
+     * @param folder
+     * @throws IOException
+     * @throws ZIPException
+     */
+    public TrueZipLegacyAlphaChunkStore(File zipFile, String folder)
+            throws IOException, ZipException {
+        this.zipFile = zipFile;
+        this.folder = folder;
+        
+        zip = new ZipFile(zipFile);
+    }
+
+    /**
+     * Create an instance. The subfolder containing the chunk data will
+     * be detected.
+     *
+     * @param zipFile
+     * @param folder
+     * @throws IOException
+     * @throws ZIPException
+     */
+    public TrueZipLegacyAlphaChunkStore(File zipFile)
+            throws IOException, ZipException {
+        this.zipFile = zipFile;
+
+        zip = new ZipFile(zipFile);
+    }
+
+    /**
+     * Get the input stream for a chunk file.
+     *
+     * @param f1
+     * @param f2
+     * @param name
+     * @return
+     * @throws IOException
+     * @throws DataException
+     */
+    @SuppressWarnings("unchecked")
+    protected InputStream getInputStream(String f1, String f2, String name)
+            throws IOException, DataException {
+        String file = f1 + "/" + f2 + "/" + name;
+
+        // Detect subfolder for the world's files
+        if (folder != null) {
+            if (!folder.equals("")) {
+                file = folder + "/" + file;
+            }
+        } else {
+            ZipEntry testEntry = zip.getEntry("level.dat");
+
+            // So, the data is not in the root directory
+            if (testEntry == null) {
+                // Let's try a world/ sub-directory
+                testEntry = getEntry("world/level.dat");
+                
+                Pattern pattern = Pattern.compile(".*[\\\\/]level\\.dat$");
+
+                // So not there either...
+                if (testEntry == null) {
+                    for (Enumeration<? extends ZipEntry> e = zip.entries();
+                            e.hasMoreElements(); ) {
+                        
+                        testEntry = (ZipEntry)e.nextElement();
+
+                        // Whoo, found level.dat!
+                        if (pattern.matcher(testEntry.getName()).matches()) {
+                            file = testEntry.getName().replaceAll("level\\.dat$", "")
+                                    + file;
+                            break;
+                        }
+                    }
+                } else {
+                    file = "world/" + file;
+                }
+            }
+        }
+
+        ZipEntry entry = getEntry(file);
+        if (entry == null) {
+            throw new MissingChunkException();
+        }
+        try {
+            return zip.getInputStream(entry);
+        } catch (ZipException e) {
+            throw new IOException("Failed to read " + file + " in ZIP");
+        }
+    }
+    
+    /**
+     * Get an entry from the ZIP, trying both types of slashes.
+     * 
+     * @param file
+     * @return
+     */
+    private ZipEntry getEntry(String file) {
+        ZipEntry entry = zip.getEntry(file);
+        if (entry != null) {
+            return entry;
+        }
+        return zip.getEntry(file.replace("/", "\\"));
+    }
+
+    /**
+     * Close resources.
+     *
+     * @throws IOException
+     */
+    public void close() throws IOException {
+        zip.close();
+    }
+}

src/com/sk89q/worldedit/data/ZippedAlphaChunkStore.java

@@ -20,6 +20,7 @@
 package com.sk89q.worldedit.data;
 
 import java.io.*;
+import java.util.regex.Pattern;
 import java.util.zip.*;
 import java.util.Enumeration;
 
@@ -102,7 +103,9 @@ public class ZippedAlphaChunkStore extends NestedFileChunkStore {
             // So, the data is not in the root directory
             if (testEntry == null) {
                 // Let's try a world/ sub-directory
-                testEntry = zip.getEntry("world/level.dat");
+                testEntry = getEntry("world/level.dat");
+                
+                Pattern pattern = Pattern.compile(".*[\\\\/]level\\.dat$");
 
                 // So not there either...
                 if (testEntry == null) {
@@ -112,7 +115,7 @@ public class ZippedAlphaChunkStore extends NestedFileChunkStore {
                         testEntry = (ZipEntry)e.nextElement();
 
                         // Whoo, found level.dat!
-                        if (testEntry.getName().matches(".+/level\\.dat")) {
+                        if (pattern.matcher(testEntry.getName()).matches()) {
                             file = testEntry.getName().replaceAll("level\\.dat$", "")
                                     + file;
                             break;
@@ -124,7 +127,7 @@ public class ZippedAlphaChunkStore extends NestedFileChunkStore {
             }
         }
 
-        ZipEntry entry = zip.getEntry(file);
+        ZipEntry entry = getEntry(file);
         if (entry == null) {
             throw new MissingChunkException();
         }
@@ -134,6 +137,20 @@ public class ZippedAlphaChunkStore extends NestedFileChunkStore {
             throw new IOException("Failed to read " + file + " in ZIP");
         }
     }
+    
+    /**
+     * Get an entry from the ZIP, trying both types of slashes.
+     * 
+     * @param file
+     * @return
+     */
+    private ZipEntry getEntry(String file) {
+        ZipEntry entry = zip.getEntry(file);
+        if (entry != null) {
+            return entry;
+        }
+        return zip.getEntry(file.replace("/", "\\"));
+    }
 
     /**
      * Close resources.

src/com/sk89q/worldedit/snapshots/Snapshot.java

@@ -57,7 +57,7 @@ public class Snapshot {
     public ChunkStore getChunkStore() throws IOException, DataException {
         if (file.getName().toLowerCase().endsWith(".zip")) {
             try {
-                return new TrueZipAlphaChunkStore(file);
+                return new TrueZipLegacyAlphaChunkStore(file);
             } catch (NoClassDefFoundError e) {
                 return new ZippedAlphaChunkStore(file);
             }