Remove dependency on commons-io library

Android.bp

@@ -37,7 +37,6 @@ android_app {
         "seedvault-lib-androidx-lifecycle-viewmodel-ktx",
         "seedvault-lib-koin-android",
         "seedvault-lib-koin-androidx-viewmodel",
-        "seedvault-lib-commons-io",
         "seedvault-lib-koin-core",
         "seedvault-lib-novacrypto-bip39",
         "seedvault-lib-novacrypto-sha256",

app/build.gradle

@@ -121,7 +121,6 @@ dependencies {
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 
-    implementation 'commons-io:commons-io:2.6'
     implementation 'io.github.novacrypto:BIP39:2019.01.27'
     implementation 'org.koin:koin-androidx-viewmodel:2.0.1'
 

app/src/main/java/com/stevesoltys/seedvault/transport/backup/FullBackup.kt

@@ -12,7 +12,7 @@ import com.stevesoltys.seedvault.crypto.Crypto
 import com.stevesoltys.seedvault.header.HeaderWriter
 import com.stevesoltys.seedvault.header.VersionHeader
 import libcore.io.IoUtils.closeQuietly
-import org.apache.commons.io.IOUtils
+import java.io.EOFException
 import java.io.IOException
 import java.io.InputStream
 import java.io.OutputStream
@@ -156,7 +156,9 @@ internal class FullBackup(
             state.outputStreamInit = null // the stream init lambda is not needed beyond that point
 
             // read backup data, encrypt it and write it to output stream
-            val payload = IOUtils.readFully(state.inputStream, numBytes)
+            val payload = ByteArray(numBytes)
+            val read = state.inputStream.read(payload, 0, numBytes)
+            if (read != numBytes) throw EOFException("Read $read bytes instead of $numBytes.")
             crypto.encryptSegment(outputStream, payload)
             TRANSPORT_OK
         } catch (e: IOException) {

libs/Android.bp

@@ -34,13 +34,6 @@ android_library_import {
     sdk_version: "current",
 }
 
-java_import {
-    name: "seedvault-lib-commons-io",
-    host_supported: true,
-    jars: ["commons-io-2.6.jar"],
-    sdk_version: "current",
-}
-
 java_import {
     name: "seedvault-lib-koin-core",
     host_supported: true,