Fixed: Downloading was not working.

* Fixed: `Online Books` were showing incorrect book sizes. The OPDS stream now provides sizes in bytes instead of kilobytes, so the code has been updated accordingly.
* Added the `io.coil-kt.coil3:coil-compose` library to load favicons for online books, as OPDS now returns favicon URLs instead of Base64-encoded strings.
* Since favicons are no longer provided in Base64 format when downloading ZIM files, we now extract the favicon from the Archive using libkiwix after the download completes. This allows us to display it locally on various screens such as the library, Wi-Fi hotspot, notes, history, and more.
* Cached the `LibkiwixBook` instance to avoid recreating it multiple times when adding or removing bookmarks.

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/online/DownloadBookItem.kt

@@ -44,7 +44,6 @@ import androidx.compose.ui.semantics.testTag
 import com.tonyodev.fetch2.Status
 import org.kiwix.kiwixmobile.R
 import org.kiwix.kiwixmobile.core.R.string
-import org.kiwix.kiwixmobile.core.downloader.model.toPainter
 import org.kiwix.kiwixmobile.core.ui.components.ContentLoadingProgressBar
 import org.kiwix.kiwixmobile.core.ui.components.ProgressBarStyle
 import org.kiwix.kiwixmobile.core.ui.models.IconItem
@@ -104,7 +103,7 @@ private fun DownloadBookContent(
       .fillMaxWidth(),
     verticalAlignment = Alignment.CenterVertically
   ) {
-    BookIcon(item.favIcon.toPainter())
+    BookIcon(item.favIconUrl, isOnlineLibrary = true)
     Column(
       modifier = Modifier
         .weight(1f)

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/online/OnlineBookItem.kt

@@ -48,8 +48,6 @@ import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.zIndex
 import org.kiwix.kiwixmobile.R
-import org.kiwix.kiwixmobile.core.downloader.model.Base64String
-import org.kiwix.kiwixmobile.core.downloader.model.toPainter
 import org.kiwix.kiwixmobile.core.extensions.toast
 import org.kiwix.kiwixmobile.core.ui.theme.KiwixTheme
 import org.kiwix.kiwixmobile.core.ui.theme.PureGrey
@@ -58,7 +56,7 @@ import org.kiwix.kiwixmobile.core.utils.ComposeDimens.FIVE_DP
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.ONLINE_BOOK_DISABLED_COLOR_ALPHA
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.SIXTEEN_DP
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.TWO_DP
-import org.kiwix.kiwixmobile.core.zim_manager.KiloByte
+import org.kiwix.kiwixmobile.core.zim_manager.Byte
 import org.kiwix.kiwixmobile.ui.BookDate
 import org.kiwix.kiwixmobile.ui.BookDescription
 import org.kiwix.kiwixmobile.ui.BookIcon
@@ -167,7 +165,7 @@ private fun OnlineBookContent(item: BookItem, bookUtils: BookUtils) {
       .fillMaxWidth(),
     verticalAlignment = Alignment.CenterVertically
   ) {
-    BookIcon(Base64String(item.book.favicon).toPainter())
+    BookIcon(item.book.favicon, isOnlineLibrary = true)
     Column(
       modifier = Modifier
         .weight(1f)
@@ -207,7 +205,7 @@ private fun BookSizeAndDateRow(item: BookItem) {
     verticalAlignment = Alignment.CenterVertically
   ) {
     BookSize(
-      KiloByte(item.book.size).humanReadable,
+      Byte(item.book.size).humanReadable,
       modifier = Modifier.weight(1f).testTag(ONLINE_BOOK_SIZE_TEXT_TESTING_TAG)
     )
     BookDate(item.book.date)

app/src/main/java/org/kiwix/kiwixmobile/ui/BookItem.kt

@@ -19,6 +19,7 @@
 package org.kiwix.kiwixmobile.ui
 
 import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.Image
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -31,18 +32,17 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.Checkbox
-import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
+import coil3.compose.AsyncImage
 import org.kiwix.kiwixmobile.core.R
 import org.kiwix.kiwixmobile.core.downloader.model.Base64String
 import org.kiwix.kiwixmobile.core.downloader.model.toPainter
@@ -53,7 +53,7 @@ import org.kiwix.kiwixmobile.core.utils.ComposeDimens.FIVE_DP
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.FOUR_DP
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.SIXTEEN_DP
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.TWO_DP
-import org.kiwix.kiwixmobile.core.zim_manager.KiloByte
+import org.kiwix.kiwixmobile.core.zim_manager.Byte
 import org.kiwix.kiwixmobile.core.zim_manager.fileselect_view.ArticleCount
 import org.kiwix.kiwixmobile.core.zim_manager.fileselect_view.BooksOnDiskListItem.BookOnDisk
 import org.kiwix.kiwixmobile.core.zim_manager.fileselect_view.SelectionMode
@@ -116,7 +116,7 @@ private fun BookContent(
     if (selectionMode == SelectionMode.MULTI) {
       BookCheckbox(bookOnDisk, selectionMode, onMultiSelect, onClick, index)
     }
-    BookIcon(Base64String(bookOnDisk.book.favicon).toPainter())
+    BookIcon(bookOnDisk.book.favicon, isOnlineLibrary = false)
     BookDetails(Modifier.weight(1f), bookOnDisk)
   }
 }
@@ -142,14 +142,23 @@ private fun BookCheckbox(
 }
 
 @Composable
-fun BookIcon(painter: Painter) {
-  Icon(
-    painter = painter,
+fun BookIcon(iconSource: String, isOnlineLibrary: Boolean) {
+  val modifier = Modifier.size(BOOK_ICON_SIZE)
+  if (isOnlineLibrary) {
+    AsyncImage(
+      model = iconSource,
       contentDescription = stringResource(R.string.fav_icon),
-    modifier = Modifier
-      .size(BOOK_ICON_SIZE),
-    tint = Color.Unspecified
+      modifier = modifier,
+      placeholder = painterResource(R.drawable.default_zim_file_icon),
+      error = painterResource(R.drawable.default_zim_file_icon),
     )
+  } else {
+    Image(
+      painter = Base64String(iconSource).toPainter(),
+      contentDescription = stringResource(R.string.fav_icon),
+      modifier = modifier
+    )
+  }
 }
 
 @Composable
@@ -164,7 +173,7 @@ private fun BookDetails(modifier: Modifier, bookOnDisk: BookOnDisk) {
     ) {
       BookDate(bookOnDisk.book.date)
       Spacer(modifier = Modifier.width(EIGHT_DP))
-      BookSize(KiloByte(bookOnDisk.book.size).humanReadable)
+      BookSize(Byte(bookOnDisk.book.size).humanReadable)
       Spacer(modifier = Modifier.width(EIGHT_DP))
       BookArticleCount(
         ArticleCount(bookOnDisk.book.articleCount.orEmpty())

app/src/main/java/org/kiwix/kiwixmobile/zimManager/ZimManageViewModel.kt

@@ -446,13 +446,19 @@ class ZimManageViewModel @Inject constructor(
   ): Flow<List<LibkiwixBook>> = flow {
     downloadProgress.postValue(context.getString(R.string.starting_downloading_remote_library))
     val response = kiwixService.getLibrary()
+    val resolvedUrl = response.raw().networkResponse?.request?.url
+      ?: response.raw().request.url
+    val baseHostUrl = "${resolvedUrl.scheme}://${resolvedUrl.host}"
     downloadProgress.postValue(context.getString(R.string.parsing_remote_library))
-    val isLibraryParsed = onlineLibraryManager.parseOPDSStream(response, KIWIX_OPDS_LIBRARY_URL)
+    val libraryXml = response.body()
+    val isLibraryParsed = onlineLibraryManager.parseOPDSStream(libraryXml, baseHostUrl)
+    emit(
       if (isLibraryParsed) {
-      emit(onlineLibraryManager.getOnlineBooks())
+        onlineLibraryManager.getOnlineBooks()
       } else {
-      emit(emptyList())
+        emptyList()
       }
+    )
   }
     .retry(5)
     .catch { e ->

app/src/main/java/org/kiwix/kiwixmobile/zimManager/libraryView/AvailableSpaceCalculator.kt

@@ -19,7 +19,6 @@
 package org.kiwix.kiwixmobile.zimManager.libraryView
 
 import eu.mhutti1.utils.storage.Bytes
-import eu.mhutti1.utils.storage.KB
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
 import org.kiwix.kiwixmobile.core.dao.DownloadRoomDao
@@ -42,7 +41,7 @@ class AvailableSpaceCalculator @Inject constructor(
       .map { downloads -> downloads.sumOf(DownloadModel::bytesRemaining) }
       .map { bytesToBeDownloaded -> storageCalculator.availableBytes() - bytesToBeDownloaded }
       .first()
-    if (bookItem.book.size.toLong() * KB < trueAvailableBytes) {
+    if (bookItem.book.size.toLong() < trueAvailableBytes) {
       successAction.invoke(bookItem)
     } else {
       failureAction.invoke(Bytes(trueAvailableBytes).humanReadable)
@@ -50,5 +49,5 @@ class AvailableSpaceCalculator @Inject constructor(
   }
 
   suspend fun hasAvailableSpaceForBook(book: LibkiwixBook) =
-    book.size.toLong() * KB < storageCalculator.availableBytes()
+    book.size.toLong() < storageCalculator.availableBytes()
 }

app/src/main/java/org/kiwix/kiwixmobile/zimManager/libraryView/adapter/LibraryListItem.kt

@@ -20,7 +20,6 @@ package org.kiwix.kiwixmobile.zimManager.libraryView.adapter
 
 import androidx.annotation.StringRes
 import com.tonyodev.fetch2.Status
-import org.kiwix.kiwixmobile.core.downloader.model.Base64String
 import org.kiwix.kiwixmobile.core.downloader.model.DownloadModel
 import org.kiwix.kiwixmobile.core.downloader.model.DownloadState
 import org.kiwix.kiwixmobile.core.downloader.model.Seconds
@@ -61,7 +60,7 @@ sealed class LibraryListItem {
 
   data class LibraryDownloadItem(
     val downloadId: Long,
-    val favIcon: Base64String,
+    val favIconUrl: String,
     val title: String,
     val description: String?,
     val bytesDownloaded: Long,
@@ -76,7 +75,7 @@ sealed class LibraryListItem {
 
     constructor(downloadModel: DownloadModel) : this(
       downloadModel.downloadId,
-      Base64String(downloadModel.book.favicon),
+      downloadModel.book.favicon,
       downloadModel.book.title,
       downloadModel.book.description,
       downloadModel.bytesDownloaded,

buildSrc/src/main/kotlin/Libs.kt

@@ -369,4 +369,7 @@ object Libs {
 
   const val COMPOSE_LIVE_DATA =
     "androidx.compose.runtime:runtime-livedata:${Versions.COMPOSE_VERSION}"
+
+  const val COIL3_COMPOSE = "io.coil-kt.coil3:coil-compose:${Versions.COIL_COMPOSE}"
+  const val COIL3_OKHTTP_COMPOSE = "io.coil-kt.coil3:coil-network-okhttp:${Versions.COIL_COMPOSE}"
 }

buildSrc/src/main/kotlin/Versions.kt

@@ -115,6 +115,8 @@ object Versions {
   const val COMPOSE_MATERIAL3 = "1.3.1"
 
   const val TURBINE_FLOW_TEST = "1.2.0"
+
+  const val COIL_COMPOSE = "3.2.0"
 }
 
 /**

buildSrc/src/main/kotlin/plugin/AllProjectConfigurer.kt

@@ -243,6 +243,8 @@ class AllProjectConfigurer {
       implementation(Libs.ANDROIDX_ACTIVITY_COMPOSE)
       implementation(Libs.COMPOSE_TOOLING_PREVIEW)
       implementation(Libs.COMPOSE_LIVE_DATA)
+      implementation(Libs.COIL3_COMPOSE)
+      implementation(Libs.COIL3_OKHTTP_COMPOSE)
 
       // Compose UI test implementation
       androidTestImplementation(Libs.COMPOSE_UI_TEST_JUNIT)

core/detekt_baseline.xml

@@ -21,7 +21,7 @@
     <ID>MagicNumber:DownloaderModule.kt$DownloaderModule$5</ID>
     <ID>MagicNumber:FileUtils.kt$FileUtils$3</ID>
     <ID>MagicNumber:JNIInitialiser.kt$JNIInitialiser$1024</ID>
-    <ID>MagicNumber:KiloByte.kt$KiloByte$1024.0</ID>
+    <ID>MagicNumber:Byte.kt$Byte$1024.0</ID>
     <ID>MagicNumber:MainMenu.kt$MainMenu$99</ID>
     <ID>MagicNumber:OnSwipeTouchListener.kt$OnSwipeTouchListener.GestureListener$100</ID>
     <ID>MagicNumber:SearchResultGenerator.kt$ZimSearchResultGenerator$200</ID>
@@ -42,7 +42,7 @@
     <ID>NestedBlockDepth:StorageDeviceUtils.kt$StorageDeviceUtils$// Amazingly file.canWrite() does not always return the correct value private fun canWrite(file: File): Boolean</ID>
     <ID>PackageNaming:ArticleCount.kt$package org.kiwix.kiwixmobile.core.zim_manager.fileselect_view</ID>
     <ID>PackageNaming:BooksOnDiskListItem.kt$package org.kiwix.kiwixmobile.core.zim_manager.fileselect_view</ID>
-    <ID>PackageNaming:KiloByte.kt$package org.kiwix.kiwixmobile.core.zim_manager</ID>
+    <ID>PackageNaming:Byte.kt$package org.kiwix.kiwixmobile.core.zim_manager</ID>
     <ID>PackageNaming:KiwixTag.kt$package org.kiwix.kiwixmobile.core.zim_manager</ID>
     <ID>PackageNaming:Language.kt$package org.kiwix.kiwixmobile.core.zim_manager</ID>
     <ID>PackageNaming:MountPointProducer.kt$package org.kiwix.kiwixmobile.core.zim_manager</ID>

core/src/main/java/org/kiwix/kiwixmobile/core/dao/DownloadRoomDao.kt

@@ -18,6 +18,7 @@
 
 package org.kiwix.kiwixmobile.core.dao
 
+import android.util.Base64
 import androidx.room.Dao
 import androidx.room.Delete
 import androidx.room.Insert
@@ -25,16 +26,20 @@ import androidx.room.Query
 import androidx.room.Update
 import com.tonyodev.fetch2.Download
 import com.tonyodev.fetch2.Status.COMPLETED
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.withContext
 import org.kiwix.kiwixmobile.core.dao.entities.DownloadRoomEntity
 import org.kiwix.kiwixmobile.core.downloader.DownloadRequester
 import org.kiwix.kiwixmobile.core.downloader.model.DownloadModel
 import org.kiwix.kiwixmobile.core.downloader.model.DownloadRequest
 import org.kiwix.kiwixmobile.core.entity.LibkiwixBook
+import org.kiwix.kiwixmobile.core.reader.ILLUSTRATION_SIZE
 import org.kiwix.kiwixmobile.core.zim_manager.fileselect_view.BooksOnDiskListItem
+import org.kiwix.libzim.Archive
 import javax.inject.Inject
 
 @Dao
@@ -53,13 +58,35 @@ abstract class DownloadRoomDao {
 
   fun allDownloads() = getAllDownloads().map { it.map(::DownloadModel) }
 
-  private fun moveCompletedToBooksOnDiskDao(downloadEntities: List<DownloadRoomEntity>) {
+  @Suppress("InjectDispatcher")
+  private suspend fun moveCompletedToBooksOnDiskDao(downloadEntities: List<DownloadRoomEntity>) {
     downloadEntities.filter { it.status == COMPLETED }
       .takeIf(List<DownloadRoomEntity>::isNotEmpty)
-      ?.let {
-        deleteDownloadsList(it)
-        newBookDao.insert(it.map(BooksOnDiskListItem::BookOnDisk))
+      ?.let { completedDownloads ->
+        deleteDownloadsList(completedDownloads)
+        // We now use the OPDS stream instead of the custom library.xml handling.
+        // In the OPDS stream, the favicon is a URL instead of a Base64 string.
+        // So when a download is completed, we extract the illustration directly from the archive.
+        val booksOnDisk = completedDownloads.map { download ->
+          val archive = withContext(Dispatchers.IO) {
+            Archive(download.file)
           }
+          val favicon = getOnlineBookFaviconForOfflineUsages(archive).orEmpty()
+          val updatedEntity = download.copy(favIcon = favicon)
+          BooksOnDiskListItem.BookOnDisk(updatedEntity)
+        }
+        newBookDao.insert(booksOnDisk)
+      }
+  }
+
+  private fun getOnlineBookFaviconForOfflineUsages(archive: Archive): String? =
+    if (archive.hasIllustration(ILLUSTRATION_SIZE)) {
+      Base64.encodeToString(
+        archive.getIllustrationItem(ILLUSTRATION_SIZE).data.data,
+        Base64.DEFAULT
+      )
+    } else {
+      null
     }
 
   fun update(download: Download) {

core/src/main/java/org/kiwix/kiwixmobile/core/dao/LibkiwixBookmarks.kt

@@ -285,6 +285,7 @@ class LibkiwixBookmarks @Inject constructor(
 
         // Check if the book has an illustration of the specified size and encode it to Base64.
         val favicon = book?.getFavicon()
+        Log.e(TAG, "getBookmarksList: $favicon")
 
         val zimReaderSource = book?.path?.let { ZimReaderSource(File(it)) }
         // Return the LibkiwixBookmarkItem, filtering out null results.

core/src/main/java/org/kiwix/kiwixmobile/core/data/remote/KiwixService.kt

@@ -21,14 +21,16 @@ package org.kiwix.kiwixmobile.core.data.remote
 
 import okhttp3.OkHttpClient
 import org.kiwix.kiwixmobile.core.entity.MetaLinkNetworkEntity
+import retrofit2.Response
 import retrofit2.Retrofit
 import retrofit2.converter.scalars.ScalarsConverterFactory
+import retrofit2.converter.simplexml.SimpleXmlConverterFactory
 import retrofit2.http.GET
 import retrofit2.http.Url
 
 interface KiwixService {
   @GET(OPDS_LIBRARY_NETWORK_PATH)
-  suspend fun getLibrary(): String?
+  suspend fun getLibrary(): Response<String>
 
   @GET
   suspend fun getMetaLinks(
@@ -43,7 +45,7 @@ interface KiwixService {
         .baseUrl(baseUrl)
         .client(okHttpClient)
         .addConverterFactory(ScalarsConverterFactory.create())
-        // .addConverterFactory(SimpleXmlConverterFactory.create())
+        .addConverterFactory(SimpleXmlConverterFactory.create())
         .build()
       return retrofit.create(KiwixService::class.java)
     }
@@ -52,6 +54,6 @@ interface KiwixService {
   companion object {
     // To fetch the full OPDS catalog.
     // TODO we will change this to pagination later once we migrate to OPDS properly.
-    const val OPDS_LIBRARY_NETWORK_PATH = "entries?count=-1"
+    const val OPDS_LIBRARY_NETWORK_PATH = "v2/entries?count=-1"
   }
 }

core/src/main/java/org/kiwix/kiwixmobile/core/di/modules/NetworkModule.kt

@@ -38,7 +38,7 @@ const val CONNECTION_TIMEOUT = 10L
 const val READ_TIMEOUT = 300L
 const val CALL_TIMEOUT = 300L
 const val USER_AGENT = "kiwix-android-version:${BuildConfig.VERSION_CODE}"
-const val KIWIX_OPDS_LIBRARY_URL = "https://opds.library.kiwix.org/v2/"
+const val KIWIX_OPDS_LIBRARY_URL = "https://opds.library.kiwix.org/"
 
 @Module
 class NetworkModule {

core/src/main/java/org/kiwix/kiwixmobile/core/downloader/model/Base64String.kt

@@ -38,7 +38,7 @@ value class Base64String(private val encodedString: String?) {
           BitmapFactory.decodeByteArray(it, 0, it.size)
         }
     }
-  } catch (illegalArgumentException: IllegalArgumentException) {
+  } catch (_: IllegalArgumentException) {
     null
   }
 }

core/src/main/java/org/kiwix/kiwixmobile/core/downloader/model/DownloadItem.kt

@@ -34,7 +34,7 @@ import org.kiwix.kiwixmobile.core.R
 
 data class DownloadItem(
   val downloadId: Long,
-  val favIcon: Base64String,
+  val favIconUrl: String,
   val title: String,
   val description: String?,
   val bytesDownloaded: Long,
@@ -47,7 +47,7 @@ data class DownloadItem(
 
   constructor(downloadModel: DownloadModel) : this(
     downloadModel.downloadId,
-    Base64String(downloadModel.book.favicon),
+    downloadModel.book.favicon,
     downloadModel.book.title,
     downloadModel.book.description,
     downloadModel.bytesDownloaded,

core/src/main/java/org/kiwix/kiwixmobile/core/extensions/BookExtensions.kt

@@ -19,6 +19,7 @@
 package org.kiwix.kiwixmobile.core.extensions
 
 import android.util.Base64
+import android.util.Log
 import org.kiwix.kiwixmobile.core.CoreApp
 import org.kiwix.kiwixmobile.core.entity.LibkiwixBook
 import org.kiwix.kiwixmobile.core.reader.ILLUSTRATION_SIZE
@@ -57,6 +58,20 @@ fun LibkiwixBook.buildSearchableText(bookUtils: BookUtils): String =
     }
   }.toString()
 
-fun Book.getFavicon(): String? = getIllustration(ILLUSTRATION_SIZE)?.data?.let {
+fun Book?.getFavicon(): String? =
+  runCatching {
+    val illustration = this?.getIllustration(ILLUSTRATION_SIZE)
+    illustration?.url()?.ifBlank {
+      illustration.data?.let {
         Base64.encodeToString(it, Base64.DEFAULT)
       }
+    }
+  }.getOrElse {
+    it.printStackTrace().also {
+      this?.illustrations?.forEach { illustration ->
+        Log.e("BOOK", "getFavicon: ${illustration.data} and ${illustration.url()}")
+      }
+      Log.e("BOOK", "getFavicon: ${this?.title}")
+    }
+    ""
+  }

core/src/main/java/org/kiwix/kiwixmobile/core/extensions/ImageViewExtensions.kt

@@ -24,20 +24,6 @@ import androidx.annotation.ColorInt
 import androidx.annotation.DrawableRes
 import androidx.core.content.ContextCompat
 import androidx.core.widget.ImageViewCompat
-import org.kiwix.kiwixmobile.core.R
-import org.kiwix.kiwixmobile.core.downloader.model.Base64String
-
-fun ImageView.setBitmap(base64String: Base64String) {
-  base64String.toBitmap()
-    ?.let(::setImageBitmap)
-    ?: kotlin.run { setImageDrawableCompat(R.drawable.default_zim_file_icon) }
-}
-
-// methods that accept inline classes as parameters are not allowed to be called from java
-// hence this facade
-fun ImageView.setBitmapFromString(string: String?) {
-  setBitmap(Base64String(string))
-}
 
 fun ImageView.setImageDrawableCompat(
   @DrawableRes id: Int

core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreReaderFragment.kt

@@ -340,6 +340,7 @@ abstract class CoreReaderFragment :
   private val navigationHistoryList: MutableList<NavigationHistoryListItem> = ArrayList()
   private var isReadSelection = false
   private var isReadAloudServiceRunning = false
+  private var libkiwixBook: Book? = null
   private var readerLifeCycleScope: CoroutineScope? = null
 
   val coreReaderLifeCycleScope: CoroutineScope?
@@ -2038,9 +2039,7 @@ abstract class CoreReaderFragment :
       lifecycleScope.launch {
         getCurrentWebView()?.url?.let { articleUrl ->
           zimReaderContainer?.zimFileReader?.let { zimFileReader ->
-            val libKiwixBook = Book().apply {
-              update(zimFileReader.jniKiwixReader)
-            }
+            val libKiwixBook = getLibkiwixBook(zimFileReader)
             if (isBookmarked) {
               repositoryActions?.deleteBookmark(libKiwixBook.id, articleUrl)
               snackBarRoot?.snack(R.string.bookmark_removed)
@@ -2071,6 +2070,19 @@ abstract class CoreReaderFragment :
     }
   }
 
+  /**
+   * Returns the libkiwix book evertime when user saves or remove the bookmark.
+   * the object will be created once to avoid creating it multiple times.
+   */
+  private fun getLibkiwixBook(zimFileReader: ZimFileReader): Book {
+    libkiwixBook?.let { return it }
+    val book = Book().apply {
+      update(zimFileReader.jniKiwixReader)
+    }
+    libkiwixBook = book
+    return book
+  }
+
   override fun onResume() {
     super.onResume()
     updateBottomToolbarVisibility()

core/src/main/java/org/kiwix/kiwixmobile/core/zim_manager/Byte.kt

@@ -23,10 +23,10 @@ import kotlin.math.log10
 import kotlin.math.pow
 
 @JvmInline
-value class KiloByte(private val kilobyteString: String?) {
+value class Byte(private val byteString: String?) {
   val humanReadable
-    get() = kilobyteString?.toLongOrNull()?.let {
-      val units = arrayOf("KB", "MB", "GB", "TB")
+    get() = byteString?.toLongOrNull()?.let {
+      val units = arrayOf("B", "KB", "MB", "GB", "TB")
       val conversion = (log10(it.toDouble()) / log10(1024.0)).toInt()
       DecimalFormat("#,##0.#")
         .format(it / 1024.0.pow(conversion.toDouble())) +