From 62b1eb927e5b2fb7a32a13eb4564457fa3adf3a0 Mon Sep 17 00:00:00 2001
From: Nik <werwolv98@gmail.com>
Date: Mon, 5 Sep 2022 22:09:23 +0200
Subject: [PATCH] patterns: Added Xilinx bitstream pattern

---
 README.md                  |  1 +
 patterns/xilinx_bit.hexpat | 52 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 patterns/xilinx_bit.hexpat

diff --git a/README.md b/README.md
index 811e89a..7eb6adf 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@ Hex patterns, include patterns and magic files for the use with the ImHex Hex Ed
 | VHDX | | `patterns/vhdx.hexpat` | Microsoft Hyper-V Virtual Hard Disk format | 
 | NTAG | | `patterns/ntag.hexpat` | NTAG213/NTAG215/NTAG216, NFC Forum Type 2 Tag compliant IC | 
 | Shell Link | `application/x-ms-shortcut` | `patterns/lnk.hexpat` | Windows Shell Link file format | 
+| Xilinx BIT | | `patterns/xilinx_bit.hexpat` | Xilinx FPGA Bitstreams | 
 
 ### Scripts
 
diff --git a/patterns/xilinx_bit.hexpat b/patterns/xilinx_bit.hexpat
new file mode 100644
index 0000000..7bff09d
--- /dev/null
+++ b/patterns/xilinx_bit.hexpat
@@ -0,0 +1,52 @@
+#include <std/mem.pat>
+#include <std/io.pat>
+
+struct Flags {
+	be u16 length;
+	u8 value[length];
+};
+
+struct TLV {
+	char tag[parent.keySize];
+	be u16 length;
+	char value[length];
+};
+
+struct Command {
+	be u32 value;
+} [[static, sealed, format("format_command")]];
+
+fn format_command(Command command) {
+	u32 x = command.value;
+	
+	if (x == 0x20000000) return "NOP";
+	if (x == 0xAA995566) return "SYNC";
+	if (x == 0x000000BB) return "Bus Width Sync";
+	if (x == 0x11220044) return "Bus Width Detect";
+	if (x == 0x30002001) return "Write to FAR";
+	if (x == 0x28006000) return "Write to FDRO";
+	if (x == 0x30000001) return "Write to CRC";
+	if (x == 0x30018001) return "Write to IDCODE";
+	if (x == 0x30004000) return "Write to FDRI";
+	if (x == 0x30008001) return "Write to CMD";
+	
+	if ((x & 0xF0000000) == 0x30000000)
+		return std::format("Write to Register {}", (x & 0x0003E000) >> 13);
+	
+	return std::format("0x{:08X}", x);
+};
+
+struct Commands {
+	char tag[parent.keySize];
+	be u32 length;
+	Command commands[length / 4];
+};
+
+struct Header {
+	Flags flags;
+	be u16 keySize;
+	TLV tlv[4];
+	Commands data;
+};
+
+Header header @ 0x00;
\ No newline at end of file