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diff --git a/native/expo-modules/comm-expo-package/android/src/main/java/app/comm/android/utils/BlobUtilsModule.kt b/native/expo-modules/comm-expo-package/android/src/main/java/app/comm/android/utils/BlobUtilsModule.kt
new file mode 100644
--- /dev/null
+++ b/native/expo-modules/comm-expo-package/android/src/main/java/app/comm/android/utils/BlobUtilsModule.kt
@@ -0,0 +1,62 @@
+package app.comm.android.utils
+
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.modules.blob.BlobModule
+import expo.modules.kotlin.exception.CodedException
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+import expo.modules.kotlin.records.Field
+import expo.modules.kotlin.records.Record
+import expo.modules.kotlin.records.Required
+import expo.modules.kotlin.typedarray.TypedArray
+import expo.modules.kotlin.typedarray.Uint8Array
+
+// This type corresponds to the BlobData interface in react-native
+class BlobMetadata: Record {
+ @Required @Field val blobId: String = ""
+ @Required @Field val size: Int = -1
+ @Required @Field val offset: Int = 0
+}
+
+class BlobUtilsModule : Module() {
+ override fun definition() = ModuleDefinition {
+ Name("BlobUtils")
+
+ Function("copyBlobToTypedArray") { blob: BlobMetadata,
+ destination: Uint8Array ->
+ val blobBytes = blobManager.resolve(blob.blobId, blob.offset, blob.size)
+ ?: throw NoSuchBlobException(blob.blobId)
+
+ destination.write(blobBytes, 0, blob.size)
+ }
+
+ Function("blobFromTypedArray") { source: TypedArray ->
+ val bytes = ByteArray(source.byteLength).also {
+ source.read(it, 0, source.byteLength)
+ }
+ val blobID = blobManager.store(bytes)
+ ?: throw BlobCreationFailedException()
+ return@Function blobID
+ }
+ }
+
+ private val reactContext
+ get() = requireNotNull(
+ this.appContext.reactContext as? ReactApplicationContext
+ ) { "React context is null or is not a ReactApplicationContext" }
+
+ private val blobManager: BlobModule
+ get() = requireNotNull(
+ this.reactContext.getNativeModule(BlobModule::class.java)
+ ) { "Couldn't load react-native's BlobModule" }
+}
+
+// region Exception definitions
+
+private class NoSuchBlobException(blobID: String) :
+ CodedException("No blob data found for blob id=$blobID")
+
+private class BlobCreationFailedException :
+ CodedException("Failed to store blob")
+
+// endregion
diff --git a/native/expo-modules/comm-expo-package/expo-module.config.json b/native/expo-modules/comm-expo-package/expo-module.config.json
--- a/native/expo-modules/comm-expo-package/expo-module.config.json
+++ b/native/expo-modules/comm-expo-package/expo-module.config.json
@@ -7,7 +7,8 @@
"modules": [
"app.comm.android.aescrypto.AESCryptoModule",
"app.comm.android.lifecycle.AndroidLifecycleModule",
- "app.comm.android.thumbhash.ThumbhashModule"
+ "app.comm.android.thumbhash.ThumbhashModule",
+ "app.comm.android.utils.BlobUtilsModule"
]
}
}

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