LCP Decryption Fails for Large PDF (~180MB) with OutOfMemoryError in LcpDecryptorKt.decryptFully

[nageshwararao1988]

Describe the bug

I am encountering a java.lang.OutOfMemoryError when attempting to decrypt a large LCP-protected resource using the readium-lcp module.

I tried with android:largeHeap="true in Manifest, Still app getting crash issue

Here is the The stack trace:

java.lang.OutOfMemoryError: Failed to allocate a 189462448 byte allocation with 25099808 free bytes and 23MB until OOM, target footprint 603979776, growth limit 603979776 at java.util.Arrays.copyOfRange(Arrays.java:3870) at kotlin.collections.ArraysKt___ArraysJvmKt.copyOfRange(_ArraysJvm.kt:1475) at org.readium.r2.lcp.LcpDecryptorKt.decryptFully(LcpDecryptor.kt:281) at org.readium.r2.lcp.LcpDecryptorKt.access$decryptFully(LcpDecryptor.kt:1) at org.readium.r2.lcp.LcpDecryptorKt$decryptFully$1.invokeSuspend(Unknown Source:14) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100) at android.os.Handler.handleCallback(Handler.java:959) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loopOnce(Looper.java:232) at android.os.Looper.loop(Looper.java:317) at android.app.ActivityThread.main(ActivityThread.java:8705) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:886) Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@b4fa5e1, Dispatchers.Main.immediate]

How to reproduce?

Trying to open PDF books After download

Readium version

3.1.2

Android API version

Android 15

Additional context

The stack trace indicates that the library is attempting to allocate a very large ByteArrayin memory using Arrays.copyOfRange within the decryptFully function, which is the root cause of the OOM crash.