Hxf-chinachip firmware analysis and source code

Reprinted please indicate the source and the author contact: http://blog.csdn.net/mimepp
Contact information: Yu Tao <yut616 at Sohu dot com>

 

Here, we will record the analysis of the firmware of huaxinfei hxf chinachip and open the source code as an open source project for your reference. Please leave a message.

 

[Open Source]

Open Source Project TRAC wiki address:

Http://trac.assembla.com/mimepp/wiki

 

[Environment]

Ubuntu Linux

 

[Analysis]

Generally, firmare contains a header, and hxf is no exception.

 

Typedef struct _ fw_header {<br/> char magic_number [8];/* e.g.: wadf0100 */<br/> char date [12];/* e.g.: 200902111654 */<br/> int package_size;/* Fw total size */<br/> int CRC; /* This is an unknown item */<br/> int reserved;/* always 0 */<br/> char version [32];/* e.g.: chinachip PMP firmware V1.0 */<br/>} fw_header;

 

It contains the firmware build date and time, the complete size of the firmware package, and the 32-bit firmware version tag.

The total length is 64 bytes.

 

The following files are followed by the firmware header.

Typedef struct _ fw_file_info {<br/> int name_len; <br/> char * Name; <br/> char space [1];/* This is a space flag? */<Br/> int size; <br/> void * content; <br/>} fw_file_info;

Generally, the file name and length are included, and the length and content of the file are connected.

Space is not completely determined. The general value is 0x20.

If name_len is 0, it indicates that no file is available.

 

For details, you can view the source code.

It can be compiled, executed, and decompiled with firmware.

 

 

[Todo]

Unimplemented parts include:

* Processing of Chinese Characters

* Processing of input parameters

* Process the output target directory

* How can I calculate CRC in detail?

* Package program

 

[Experience]

During the analysis process, a lot of content needs to be guessed and tested. This is not a one-stop process. It feels a bit like feeling over the river.

I have never seen a complete open source project to track the analysis of hxf firmware, So I established a project to discuss and develop together, hoping to serve as a reference for interested friends.

 

You are also welcome to join us for development.

You can send a mail to contact yut616 _ AT _ sohu.com.