From 8f39ecd879022e1101eeac8522b85bad6e61515c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Alvarez?= <nicolas.alvarez@gmail.com>
Date: Sat, 17 Dec 2022 18:36:41 -0500
Subject: [PATCH] patterns: Added pattern file for Apple PBZX compressed
 streams (#63)

This is used by Apple for Xcode .xip files (cpio in pbzx in xar), OTA
updates of iOS, and other files.
---
 patterns/pbzx.hexpat | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 patterns/pbzx.hexpat

diff --git a/patterns/pbzx.hexpat b/patterns/pbzx.hexpat
new file mode 100644
index 0000000..a61cbc7
--- /dev/null
+++ b/patterns/pbzx.hexpat
@@ -0,0 +1,30 @@
+// pbzx compression stream
+// Used by Apple on .xip files and OTA updates.
+//
+// Copyright (c) 2022 Nicolás Alvarez <nicolas.alvarez@gmail.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <std/mem.pat>
+
+#pragma endian big
+
+#define SHOW_DATA 0
+
+struct Chunk {
+    u64 uncompressed_size;
+    u64 compressed_size;
+    if (SHOW_DATA) {
+        u8 data[compressed_size] [[sealed]];
+    } else {
+        padding[compressed_size];
+    }
+};
+
+struct PBZX {
+    char magic[4];
+    u64 chunk_size;
+    Chunk chunks[while(!std::mem::eof())];
+};
+
+PBZX pbzx @ 0;