From 93d54c8f844b50fa9bd8ce8c1fa32d0d2133e13a Mon Sep 17 00:00:00 2001
From: Sucukdeluxe <Sucukdeluxe@users.noreply.github.com>
Date: Tue, 3 Mar 2026 16:15:44 +0100
Subject: [PATCH] Fix multi-part RAR: get first stream via callback, track
 current volume name

Two bugs in SevenZipVolumeCallback caused multi-part RAR extraction to fail:

1. getProperty(NAME) always returned firstFileName instead of tracking the
   last opened volume name. 7z-JBinding needs this to compute subsequent
   volume filenames.

2. The first IInStream was created separately instead of through the
   callback's getStream() method, so the volume name tracker was not
   properly initialized.

Verified with real multi-part RAR5 test archives (3 parts, WinRAR 7.01).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 ...ExtractorMain$SevenZipVolumeCallback.class | Bin 3729 -> 3742 bytes
 .../extractor/JBindExtractorMain.class        | Bin 20463 -> 20639 bytes
 .../extractor/JBindExtractorMain.java         |  53 ++++++++++--------
 3 files changed, 29 insertions(+), 24 deletions(-)

diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$SevenZipVolumeCallback.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$SevenZipVolumeCallback.class
index c97127d1ec733e14e3ac707fba5a690a1e8068d9..4e1cd8a092af00e74f40b4d76032258a9d95756c 100644
GIT binary patch
delta 323
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delta 305
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diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain.class
index 7b8993edb44640d08a4ab3623633cd281711fdc9..a6fa276959891ba0f5fe8c8a5c3619ea02444491 100644
GIT binary patch
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diff --git a/resources/extractor-jvm/src/com/sucukdeluxe/extractor/JBindExtractorMain.java b/resources/extractor-jvm/src/com/sucukdeluxe/extractor/JBindExtractorMain.java
index e179646..7ed46ec 100644
--- a/resources/extractor-jvm/src/com/sucukdeluxe/extractor/JBindExtractorMain.java
+++ b/resources/extractor-jvm/src/com/sucukdeluxe/extractor/JBindExtractorMain.java
@@ -337,37 +337,37 @@ public final class JBindExtractorMain {
             return new SevenZipArchiveContext(archive, null, volumed, callback);
         }
 
-        RandomAccessFile raf = new RandomAccessFile(archiveFile, "r");
-        RandomAccessFileInStream stream = new RandomAccessFileInStream(raf);
-
         // Multi-part RAR (.part1.rar, .part2.rar or old-style .rar/.r01/.r02):
-        // Auto-detection with null format can fail for multi-volume RAR because
-        // 7z-JBinding may not fully recognize the format from a single part.
-        // Specify the format explicitly (try RAR5 first, then RAR4).
-        if (RAR_MULTIPART_RE.matcher(nameLower).matches() || hasOldStyleRarSplits(archiveFile)) {
-            ArchiveFormat[] rarFormats = { ArchiveFormat.RAR5, ArchiveFormat.RAR };
+        // The first stream MUST be obtained via the callback so the volume name
+        // tracker is properly initialized. 7z-JBinding uses getProperty(NAME)
+        // to compute subsequent volume filenames.
+        boolean isMultiPartRar = RAR_MULTIPART_RE.matcher(nameLower).matches()
+            || hasOldStyleRarSplits(archiveFile);
+
+        if (isMultiPartRar) {
+            IInStream inStream = callback.getStream(archiveFile.getAbsolutePath());
+            if (inStream == null) {
+                throw new IOException("Archiv konnte nicht geoeffnet werden: " + archiveFile.getAbsolutePath());
+            }
+            // Try RAR5 first (modern), then RAR4, then auto-detect
             Exception lastError = null;
+            ArchiveFormat[] rarFormats = { ArchiveFormat.RAR5, ArchiveFormat.RAR, null };
             for (ArchiveFormat fmt : rarFormats) {
                 try {
-                    stream.seek(0L, 0);
-                    IInArchive archive = SevenZip.openInArchive(fmt, stream, callback);
-                    return new SevenZipArchiveContext(archive, stream, null, callback);
+                    inStream.seek(0L, 0);
+                    IInArchive archive = SevenZip.openInArchive(fmt, inStream, callback);
+                    return new SevenZipArchiveContext(archive, null, null, callback);
                 } catch (Exception e) {
                     lastError = e;
                 }
             }
-            // Final attempt with auto-detection
-            try {
-                stream.seek(0L, 0);
-                IInArchive archive = SevenZip.openInArchive(null, stream, callback);
-                return new SevenZipArchiveContext(archive, stream, null, callback);
-            } catch (Exception e) {
-                // Close the RAF since we're about to throw
-                try { raf.close(); } catch (Throwable ignored) {}
-                throw lastError != null ? lastError : e;
-            }
+            callback.close();
+            throw lastError != null ? lastError : new IOException("Archiv konnte nicht geoeffnet werden");
         }
 
+        // Single-file archives: open directly with auto-detection
+        RandomAccessFile raf = new RandomAccessFile(archiveFile, "r");
+        RandomAccessFileInStream stream = new RandomAccessFileInStream(raf);
         IInArchive archive = SevenZip.openInArchive(null, stream, callback);
         return new SevenZipArchiveContext(archive, stream, null, callback);
     }
@@ -840,20 +840,22 @@ public final class JBindExtractorMain {
 
     private static final class SevenZipVolumeCallback implements IArchiveOpenCallback, IArchiveOpenVolumeCallback, ICryptoGetTextPassword, Closeable {
         private final File archiveDir;
-        private final String firstFileName;
         private final String password;
         private final Map<String, RandomAccessFile> openRafs = new HashMap<String, RandomAccessFile>();
+        // Must track the LAST opened volume name — 7z-JBinding queries this via
+        // getProperty(NAME) to compute the next volume filename.
+        private volatile String currentVolumeName;
 
         SevenZipVolumeCallback(File archiveFile, String password) {
             this.archiveDir = archiveFile.getAbsoluteFile().getParentFile();
-            this.firstFileName = archiveFile.getName();
+            this.currentVolumeName = archiveFile.getName();
             this.password = password == null ? "" : password;
         }
 
         @Override
         public Object getProperty(PropID propID) {
             if (propID == PropID.NAME) {
-                return firstFileName;
+                return currentVolumeName;
             }
             return null;
         }
@@ -872,6 +874,9 @@ public final class JBindExtractorMain {
                     openRafs.put(key, raf);
                 }
                 raf.seek(0L);
+                // Update current volume name so getProperty(NAME) returns the
+                // correct value when 7z-JBinding computes the next volume.
+                currentVolumeName = filename;
                 return new RandomAccessFileInStream(raf);
             } catch (IOException error) {
                 throw new SevenZipException("Volume konnte nicht geoffnet werden: " + filename, error);