From b130b507349952cbab2a371628891de78cc8dda2 Mon Sep 17 00:00:00 2001
From: Amaury Pouly <amaury.pouly@gmail.com>
Date: Mon, 23 Mar 2015 21:30:06 +0100
Subject: Add jz4760 tool

This tool can pack/unpack a jz4760 archive (like the one used for the fiio
x1/x3/x5), and can descramble/scramble (it's the same operation) a firmware
file (the sys.bin file in the archive). I did my best to keep the compatibility
with the leaked Fiio/Ingenic tool which has the same name.

I wrote the tools from scratch, but here are some remarks:
- the format used is a slightly modified IHFS used in the older JZ4640 series,
  I used the information on the wiki about the IHFS format
- the CRC computation done was already reversed engineered by someone on the
  forums but I realised this later
- There are a few unknown fields in the headers, see comments in the source code
- The firmware scrambling was discovered by pure guess, I realised there were
  some repetitve sequences, some I guessed it was a rotative XOR and ran some
  analysis to find the most probable sequence

Change-Id: Ib83735b3db8475be5de9c94231714e88668a0340
---
 utils/jz4760_tools/Makefile | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 utils/jz4760_tools/Makefile

(limited to 'utils/jz4760_tools/Makefile')

diff --git a/utils/jz4760_tools/Makefile b/utils/jz4760_tools/Makefile
new file mode 100644
index 0000000000..847539e38c
--- /dev/null
+++ b/utils/jz4760_tools/Makefile
@@ -0,0 +1,21 @@
+DEFINES=
+CC?=gcc
+CXX?=g++
+LD?=g++
+CFLAGS=-g -std=c99 -Wall $(DEFINES) -Ilib
+CXXFLAGS=-g -Wall $(DEFINES)
+LDFLAGS=
+SRC=$(wildcard *.c)
+SRCXX=$(wildcard *.cpp)
+EXEC=$(SRC:.c=) $(SRCXX:.cpp=)
+
+all: $(EXEC)
+
+%: %.c
+	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
+
+%: %.cpp
+	$(CXX) $(CXXFLAGS) -o $@ $< $(LDFLAGS)
+
+clean:
+	rm -fr $(EXEC)
-- 
cgit