Kotlin conversion: ArmoredInputStreamFactory

pgpainless-core/src/main/kotlin/org/pgpainless/util/ArmoredInputStreamFactory.kt

@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.util
+
+import org.bouncycastle.bcpg.ArmoredInputStream
+import java.io.IOException
+import java.io.InputStream
+
+/**
+ * Factory class for instantiating preconfigured [ArmoredInputStream] instances.
+ * [get] will return an [ArmoredInputStream] that is set up to properly detect CRC errors v4 style.
+ */
+class ArmoredInputStreamFactory {
+
+    companion object {
+
+        /**
+         * Return an instance of [ArmoredInputStream] which will detect CRC errors.
+         *
+         * @param inputStream input stream
+         * @return armored input stream
+         * @throws IOException in case of an IO error
+         */
+        @JvmStatic
+        @Throws(IOException::class)
+        fun get(inputStream: InputStream): ArmoredInputStream {
+            return when (inputStream) {
+                is CRCingArmoredInputStreamWrapper -> inputStream
+                is ArmoredInputStream -> CRCingArmoredInputStreamWrapper(inputStream)
+                else -> CRCingArmoredInputStreamWrapper(ArmoredInputStream(inputStream))
+            }
+        }
+    }
+}