From d247e0b0a96c0a0feae7f3cb61de9227b9a4e789 Mon Sep 17 00:00:00 2001
From: Behzod Halil <behzoddev@gmail.com>
Date: Sun, 4 Feb 2024 22:04:40 +0900
Subject: [PATCH] feat: Add outer header option (#183)

---
 .../database/header/OuterHeaderOption.kt      | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 tinypass/src/commonMain/kotlin/io/spherelabs/crypto/tinypass/database/header/OuterHeaderOption.kt

diff --git a/tinypass/src/commonMain/kotlin/io/spherelabs/crypto/tinypass/database/header/OuterHeaderOption.kt b/tinypass/src/commonMain/kotlin/io/spherelabs/crypto/tinypass/database/header/OuterHeaderOption.kt
new file mode 100644
index 00000000..e465464c
--- /dev/null
+++ b/tinypass/src/commonMain/kotlin/io/spherelabs/crypto/tinypass/database/header/OuterHeaderOption.kt
@@ -0,0 +1,41 @@
+package io.spherelabs.crypto.tinypass.database.header
+
+import io.spherelabs.crypto.tinypass.database.signature.Signature
+import okio.Buffer
+import okio.BufferedSink
+
+data class OuterHeaderOption(
+    val signature: Signature,
+    val version: Version,
+    val cipherId: CipherId,
+    val compressionFlags: CompressionFlags
+) {
+    fun serialize(sink: BufferedSink) {
+        signature.serialize(sink)
+        version.serialize(sink)
+
+        sink.writeByte(CIPHER_ID)
+        sink.writeIntLe(16)
+        val bytes = Buffer().apply {
+            writeLong(cipherId.uuid.mostSignificantBits)
+            writeLong(cipherId.uuid.leastSignificantBits)
+        }
+        sink.write(bytes.readByteArray())
+
+        sink.writeByte(OuterHeader.COMPRESSION)
+        sink.writeIntLe(Int.SIZE_BYTES)
+        sink.writeIntLe(compressionFlags.ordinal)
+    }
+
+    companion object {
+        val Default = OuterHeaderOption(
+            signature = Signature.Default,
+            version = Version(4, 1),
+            compressionFlags = CompressionFlags.GZip,
+            cipherId = CipherId.Aes,
+        )
+
+        const val CIPHER_ID = 1
+        const val COMPRESSION = 2
+    }
+}