fix: preserve timestamps when decompressing ZIP files

* Preserve modified date when unzip files.

* Preserve modified date when unzip files via actions menu

- Additionally handle the case with 0 last modified time.

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Preserve modified date when unzip files ([#176])
+
 ## [1.1.0] - 2025-05-21
 
 ### Added
@@ -66,3 +70,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#120]: https://github.com/FossifyOrg/File-Manager/issues/120
 [#149]: https://github.com/FossifyOrg/File-Manager/issues/149
 [#150]: https://github.com/FossifyOrg/File-Manager/issues/150
+[#176]: https://github.com/FossifyOrg/File-Manager/issues/176

app/src/main/kotlin/org/fossify/filemanager/activities/DecompressActivity.kt

@@ -26,6 +26,7 @@ import org.fossify.filemanager.R
 import org.fossify.filemanager.adapters.DecompressItemsAdapter
 import org.fossify.filemanager.databinding.ActivityDecompressBinding
 import org.fossify.filemanager.extensions.config
+import org.fossify.filemanager.extensions.setLastModified
 import org.fossify.filemanager.models.ListItem
 import java.io.BufferedInputStream
 import java.io.File
@@ -171,7 +172,9 @@ class DecompressActivity : SimpleActivity() {
                         continue
                     }
 
-                    val isVulnerableForZipPathTraversal = !File(newPath).canonicalPath.startsWith(parent)
+                    val outputFile = File(newPath)
+
+                    val isVulnerableForZipPathTraversal = !outputFile.canonicalPath.startsWith(parent)
                     if (isVulnerableForZipPathTraversal) {
                         continue
                     }
@@ -187,6 +190,7 @@ class DecompressActivity : SimpleActivity() {
                         fos!!.write(buffer, 0, count)
                     }
                     fos!!.close()
+                    outputFile.setLastModified(entry)
                 }
 
                 toast(R.string.decompression_successful)

app/src/main/kotlin/org/fossify/filemanager/adapters/ItemsAdapter.kt

@@ -101,6 +101,7 @@ import org.fossify.filemanager.extensions.config
 import org.fossify.filemanager.extensions.isPathOnRoot
 import org.fossify.filemanager.extensions.isZipFile
 import org.fossify.filemanager.extensions.setAs
+import org.fossify.filemanager.extensions.setLastModified
 import org.fossify.filemanager.extensions.sharePaths
 import org.fossify.filemanager.extensions.toggleItemVisibility
 import org.fossify.filemanager.extensions.tryOpenPathIntent
@@ -693,6 +694,7 @@ class ItemsAdapter(
             val fos = activity.getFileOutputStreamSync(newPath, newPath.getMimeType())
             if (fos != null) {
                 zipInputStream.copyTo(fos)
+                File(newPath).setLastModified(entry)
             }
         }
     }

app/src/main/kotlin/org/fossify/filemanager/extensions/Zip4j.kt

@@ -0,0 +1,15 @@
+package org.fossify.filemanager.extensions
+
+import net.lingala.zip4j.model.LocalFileHeader
+import java.io.File
+
+fun File.setLastModified(localFileHeader: LocalFileHeader) {
+    setLastModified(localFileHeader.lastModifiedOrCurrentTimeMillis)
+}
+
+private val LocalFileHeader.lastModifiedOrCurrentTimeMillis
+    get() = if (lastModifiedTimeEpoch == 0L) {
+        System.currentTimeMillis()
+    } else {
+        lastModifiedTimeEpoch
+    }