From 35e84e652e0310dacd61e527cf6bd32e658c1b19 Mon Sep 17 00:00:00 2001
From: Sucukdeluxe <Sucukdeluxe@users.noreply.github.com>
Date: Tue, 3 Mar 2026 16:03:01 +0100
Subject: [PATCH] Fix multi-part RAR: use explicit ArchiveFormat instead of
 VolumedArchiveInStream

VolumedArchiveInStream only works for .7z.001 splits - it rejects RAR
filenames. For multi-part RAR (.partN.rar), use RandomAccessFileInStream
with explicit ArchiveFormat.RAR5/RAR format specification. Auto-detection
with null format can fail for multi-volume RAR archives.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .../extractor/JBindExtractorMain$1.class      | Bin 1710 -> 1710 bytes
 .../JBindExtractorMain$Backend.class          | Bin 2260 -> 2260 bytes
 .../JBindExtractorMain$ConflictMode.class     | Bin 2014 -> 2014 bytes
 ...JBindExtractorMain$ExtractionRequest.class | Bin 2539 -> 2539 bytes
 .../JBindExtractorMain$ProgressTracker.class  | Bin 1387 -> 1387 bytes
 ...ExtractorMain$SevenZipArchiveContext.class | Bin 1663 -> 1663 bytes
 ...ExtractorMain$SevenZipVolumeCallback.class | Bin 3729 -> 3729 bytes
 ...ExtractorMain$WrongPasswordException.class | Bin 458 -> 458 bytes
 .../extractor/JBindExtractorMain.class        | Bin 19881 -> 20463 bytes
 .../extractor/JBindExtractorMain.java         |  40 +++++++++++++++---
 10 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$1.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$1.class
index 126b7c0a34b08a35ba52135d51d74adeb8222c0b..55f87ba814f8112b2582c5f6d5035bc72c8d65a0 100644
GIT binary patch
delta 55
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delta 55
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L8KovCviSl49AyY{

diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$Backend.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$Backend.class
index ff477d8c5237dde0e2b7693fa677606e9a94f8d6..2c503da0737e1d30407c4a92d221262c657b17d3 100644
GIT binary patch
delta 97
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delta 97
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diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$ConflictMode.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$ConflictMode.class
index 44ea2eca3012029390ca530aa7461a378e542130..6376bb2641afbe8505a14e6de333b3739a7e4e4c 100644
GIT binary patch
delta 83
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delta 83
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diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$ExtractionRequest.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$ExtractionRequest.class
index 9653dc00b8a3c27233274b05ee7d793e694a5248..627e04160ff0f2b548a2f9741011252ccec264df 100644
GIT binary patch
delta 85
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delta 85
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diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$ProgressTracker.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$ProgressTracker.class
index e9e2f0652158e71d7ca45a21764bd07795281ba1..025b84d44cac3b58f497d7c93505e5d0e2ce9190 100644
GIT binary patch
delta 117
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delta 117
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diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$SevenZipArchiveContext.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$SevenZipArchiveContext.class
index 5535b311cbcf9efcca49e1a53d2b8ef410579cfa..4beedba981ffa5e25b753877496e616ca32fb351 100644
GIT binary patch
delta 101
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delta 101
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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 43368bf2544ed356886483d314af2688909e1cc9..c97127d1ec733e14e3ac707fba5a690a1e8068d9 100644
GIT binary patch
delta 219
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delta 219
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diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$WrongPasswordException.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain$WrongPasswordException.class
index 912a44b5802cc45f590c0654e800afcb72e60bde..d20b17361a1fe383b6c2dff4d253e38638b72bcf 100644
GIT binary patch
delta 17
ZcmX@be2RI)YDU(t46IDwCU0Pr0suVj2220|

delta 17
ZcmX@be2RI)YDU)E46ICdCU0Pr0suRL1{eSU

diff --git a/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain.class b/resources/extractor-jvm/classes/com/sucukdeluxe/extractor/JBindExtractorMain.class
index 41b88f198817b3e89f6fae5d6341c2d18d12300a..7b8993edb44640d08a4ab3623633cd281711fdc9 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 c50160d..e179646 100644
--- a/resources/extractor-jvm/src/com/sucukdeluxe/extractor/JBindExtractorMain.java
+++ b/resources/extractor-jvm/src/com/sucukdeluxe/extractor/JBindExtractorMain.java
@@ -11,6 +11,7 @@ import net.sf.sevenzipjbinding.IInStream;
 import net.sf.sevenzipjbinding.ISequentialOutStream;
 import net.sf.sevenzipjbinding.ICryptoGetTextPassword;
 import net.sf.sevenzipjbinding.PropID;
+import net.sf.sevenzipjbinding.ArchiveFormat;
 import net.sf.sevenzipjbinding.SevenZip;
 import net.sf.sevenzipjbinding.SevenZipException;
 import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
@@ -328,13 +329,9 @@ public final class JBindExtractorMain {
         String effectivePassword = password == null ? "" : password;
         SevenZipVolumeCallback callback = new SevenZipVolumeCallback(archiveFile, effectivePassword);
 
-        // Multi-volume archives need VolumedArchiveInStream so 7z-JBinding can
-        // request additional volumes via the IArchiveOpenVolumeCallback.
-        boolean isMultiVolume = SEVEN_ZIP_SPLIT_RE.matcher(nameLower).matches()
-            || RAR_MULTIPART_RE.matcher(nameLower).matches()
-            || hasOldStyleRarSplits(archiveFile);
-
-        if (isMultiVolume) {
+        // VolumedArchiveInStream is ONLY for .7z.001 split archives.
+        // It internally checks for the ".7z.001" suffix and rejects everything else.
+        if (SEVEN_ZIP_SPLIT_RE.matcher(nameLower).matches()) {
             VolumedArchiveInStream volumed = new VolumedArchiveInStream(archiveFile.getName(), callback);
             IInArchive archive = SevenZip.openInArchive(null, volumed, callback);
             return new SevenZipArchiveContext(archive, null, volumed, callback);
@@ -342,6 +339,35 @@ public final class JBindExtractorMain {
 
         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 };
+            Exception lastError = null;
+            for (ArchiveFormat fmt : rarFormats) {
+                try {
+                    stream.seek(0L, 0);
+                    IInArchive archive = SevenZip.openInArchive(fmt, stream, callback);
+                    return new SevenZipArchiveContext(archive, stream, 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;
+            }
+        }
+
         IInArchive archive = SevenZip.openInArchive(null, stream, callback);
         return new SevenZipArchiveContext(archive, stream, null, callback);
     }