General fixes (#19)

* fix OOM crash by refactoring EpubImage to use lazy loading

- Removed raw image ByteArray from EpubImage data class to prevent OutOfMemoryErrors on large books.
- Updated EpubParser and MobiParser to only store image paths in the EpubBook object.
- Images are now loaded on-demand from disk via file URIs in WebView and Coil, reducing initial heap allocation.

* fix(tts): resolve OutOfMemoryError by removing large strings from state bundle

- Removed 'currentText' from the TtsState bundle inside MediaSession custom layout.
- Updated TtsController to retrieve the current text chunk via MediaItem metadata.
- This prevents heap exhaustion caused by high-frequency serialization of large text strings during word tracking and polling updates.

app/src/main/java/com/aryan/reader/epub/EpubImage.kt

@@ -27,29 +27,9 @@ import kotlinx.serialization.protobuf.ProtoNumber
  * Represents an image in an epub book.
  *
  * @param absPath The absolute path of the image.
- * @param image The image data.
  */
 @OptIn(ExperimentalSerializationApi::class)
 @Serializable
 data class EpubImage @OptIn(ExperimentalSerializationApi::class) constructor(
-    @ProtoNumber(1) val absPath: String,
-    @ProtoNumber(2) val image: ByteArray
-) {
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (javaClass != other?.javaClass) return false
-
-        other as EpubImage
-
-        if (absPath != other.absPath) return false
-        if (!image.contentEquals(other.image)) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = absPath.hashCode()
-        result = 31 * result + image.contentHashCode()
-        return result
-    }
-}
+    @ProtoNumber(1) val absPath: String
+)

app/src/main/java/com/aryan/reader/epub/EpubParser.kt

@@ -577,30 +577,29 @@ class EpubParser(private val context: Context) {
     private fun parseEpubImages(
         manifestItems: Map<String, EpubManifestItem>,
         filesContentMap: Map<String, EpubFile>,
-        extractionRoot: File // Add this param
+        @Suppress("UNUSED_PARAMETER") extractionRoot: File
     ): List<EpubImage> {
-        val imageExtensions = listOf("png", "gif", "jpg", "jpeg", "webp", "svg").map { ".$it" }
+        val imageExtensions = setOf(".png", ".gif", ".jpg", ".jpeg", ".webp", ".svg")
 
         val listedImages = manifestItems.values
             .filter { it.mediaType.startsWith("image/") }
-            .mapNotNull { manifestItem ->
-                val bytes = filesContentMap[manifestItem.absPath]?.data?.takeIf { it.isNotEmpty() }
-                    ?: File(extractionRoot, manifestItem.absPath).takeIf { it.exists() }?.readBytes()
-
-                bytes?.let { EpubImage(absPath = manifestItem.absPath, image = it) }
+            .map { manifestItem ->
+                EpubImage(absPath = manifestItem.absPath)
             }
 
-        val unlistedImages = filesContentMap.asSequence()
-            .filter { (path, _) -> imageExtensions.any { path.endsWith(it, ignoreCase = true) } }
-            .filterNot { (path, _) -> listedImages.any { it.absPath == path } }
-            .mapNotNull { (path, file) ->
-                val bytes = file.data.takeIf { it.isNotEmpty() }
-                    ?: File(extractionRoot, path).takeIf { it.exists() }?.readBytes()
+        val listedPaths = listedImages.map { it.absPath }.toSet()
 
-                bytes?.let { EpubImage(absPath = path, image = it) }
+        val unlistedImages = filesContentMap.keys
+            .filter { path ->
+                val lowerPath = path.lowercase()
+                imageExtensions.any { lowerPath.endsWith(it) } && !listedPaths.contains(path)
+            }
+            .map { path ->
+                EpubImage(absPath = path)
             }
 
-        return (listedImages + unlistedImages).distinctBy { it.absPath }.toList()
+        Timber.d("Identified ${listedImages.size + unlistedImages.size} images (content not loaded into memory).")
+        return (listedImages + unlistedImages).distinctBy { it.absPath }
     }
 
     private fun parseCoverImage(

app/src/main/java/com/aryan/reader/epub/MobiParser.kt

@@ -109,8 +109,6 @@ class MobiParser(private val context: Context) {
     private external fun parseMobiFile(filePath: String): ParsedMobiData?
 
     companion object {
-        private const val TAG = "MobiParser"
-        private const val AZW3_TAG = "AZW3_DEBUG"
         const val EXTRACTED_EPUB_DIR_NAME = "extracted_epubs"
 
         init {
@@ -135,7 +133,7 @@ class MobiParser(private val context: Context) {
             }
             Timber.d("MOBI stream saved to temporary file: ${tempFile.absolutePath}")
         } catch (e: Exception) {
-            Timber.e("Failed to write InputStream to temporary file.", e)
+            Timber.e(e, "Failed to write InputStream to temporary file.")
             tempFile.delete()
             return@withContext null
         }
@@ -143,7 +141,7 @@ class MobiParser(private val context: Context) {
         val parsedData = try {
             parseMobiFile(tempFile.absolutePath)
         } catch (e: UnsatisfiedLinkError) {
-            Timber.e("JNI call failed. Is the native library loaded correctly?", e)
+            Timber.e(e, "JNI call failed. Is the native library loaded correctly?")
             null
         } finally {
             tempFile.delete()
@@ -177,7 +175,7 @@ class MobiParser(private val context: Context) {
                 file.writeBytes(resource.data)
                 Timber.d("Wrote resource to disk -> Path: ${file.absolutePath}, Type: ${resource.mediaType}, Size: ${resource.data.size}")
             } catch (e: Exception) {
-                Timber.e("Parser: FAILED to write resource to disk: ${resource.path}", e)
+                Timber.e(e, "Parser: FAILED to write resource to disk: ${resource.path}")
             }
         }
 
@@ -229,7 +227,7 @@ class MobiParser(private val context: Context) {
         val chapterHtmlParts = mutableListOf<Pair<String, String>>()
 
         val sortedToc = parsedData.toc?.sorted()
-        if (sortedToc != null && sortedToc.isNotEmpty()) {
+        if (!sortedToc.isNullOrEmpty()) {
             Timber.d("Splitting content using TOC (${sortedToc.size} entries).")
             for (i in sortedToc.indices) {
                 val tocEntry = sortedToc[i]
@@ -268,14 +266,14 @@ class MobiParser(private val context: Context) {
                     plainTextContent = doc.text()
                 )
             } catch (e: Exception) {
-                Timber.e("Failed to process split chapter $index", e)
+                Timber.e(e, "Failed to process split chapter $index")
                 null
             }
         }
 
         val images = parsedData.resources
             .filter { it.mediaType.startsWith("image/") }
-            .map { EpubImage(absPath = it.path, image = it.data) }
+            .map { EpubImage(absPath = it.path) }
 
         val cssContent = parsedData.resources
             .filter { it.mediaType == "text/css" }

app/src/main/java/com/aryan/reader/tts/TtsController.kt

@@ -236,7 +236,7 @@ class TtsController(context: Context) : Player.Listener {
                 isPlaying = controller.isPlaying,
                 isLoading = isLoading,
                 currentText = if (isPlaybackActive) {
-                    currentTextFromMediaItem ?: customState.getString("currentText")
+                    currentTextFromMediaItem
                 } else {
                     if (isLoading) currentState.currentText else null
                 },

app/src/main/java/com/aryan/reader/tts/TtsPlaybackManager.kt

@@ -615,7 +615,6 @@ class TtsPlaybackManager(
     private fun createStateButton(state: TtsState): CommandButton {
         val bundle = Bundle().apply {
             putBoolean("isLoading", state.isLoading)
-            putString("currentText", state.currentText)
             putString("errorMessage", state.errorMessage)
             putString("speakerId", state.speakerId)
             putBoolean("sessionEndedByStop", state.sessionEndedByStop)