blocks|key|3022510|text|我也有同样的问题，最初在Google+Code上找到了这个项目，该项目旨在为Garmin设备完成跨平台版本的工具……请参阅：http://code.google.com/p/garmintools/在该项目的首页有一个链接，指向您需要的协议，Garmin考虑周到，公开发布了该协议。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3022511|这里有一个到Garmin+/O规范的直接链接：http://www.garmin.com/support/pdf/IOSDK.zip|3022512|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/garmintools/|1|http://www.garmin.com/support/pdf/IOSDK.zip^0|1Q|11|0|0|N|17|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

I had the same problem and initially found this project at Google Code that aims to complete a cross-platform version of tools for the Garmin devices ... see: <a href="http://code.google.com/p/garmintools/" rel="nofollow noreferrer">http://code.google.com/p/garmintools/</a>. There's a link on the front page of that project to the protocols you need, which Garmin was thoughtful enough to release publically.

And here's a direct link to the Garmin I/O specification: <a href="http://www.garmin.com/support/pdf/IOSDK.zip" rel="nofollow noreferrer">http://www.garmin.com/support/pdf/IOSDK.zip</a>

blocks|key|766990|text|我开始在十六进制编辑器中查看数据，希望是一个好的编辑器，它知道最常见的编码(ASCII、Unicode等)。然后试着从你知道它已经存储的数据中找出它的意义。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|766991|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I'd start looking at the data in a hexadecimal editor, hopefully a good one which knows the most common encodings (ASCII, Unicode, etc.) and then try to make sense of it out of the data you know it has stored.

blocks|key|3022586|text|正如另一位发帖者所提到的，逆向工程可能是多此一举，不是在实践中，而是在合法性上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3022587|也就是说，你可以通过检查这个项目和它的code...and来找到与你手头的根本问题相关的一切。他们也可以处理跑步者的心率/GPS组合数据|3022588|http://www.gpsbabel.org/|offset|length|3022589|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|O|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

As another poster mentioned, reverse engineering can be hairy, not in practice but in legality. 

That being said, you may be able to find everything related to your root question at hand by checking out this project and its' code...and they do handle the runner's heart rate/GPS combo data as well

<a href="http://www.gpsbabel.org/" rel="nofollow noreferrer">http://www.gpsbabel.org/</a>

blocks|key|3022182|text|我建议你从检查反向工程在你的原产国的合法性开始。大多数国家都有非常严格的法律，关于反向工程设备和代码允许什么，不允许什么。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3022183|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I'd suggest you start with checking the legality of reverse engineering in your country of origin. Most countries have very strict laws about what is allowed and what isn't regarding reverse engineering devices and code.

blocks|key|5278595|text|我将从查看设备正在发送的数据开始，然后考虑如何表示和打包这些数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5278596|我首先会捕获许多样本，看看是否存在任何模式，因为心跳是有规律的东西，这表明它是与心脏本身相关的测量。我还会寻找单调递增的位域，因为这会暗示某种时间戳。|5278597|在形成了一个假设之后，我将编写一个程序来测试它，并将结果绘制成图形，看看它是否有意义。如果是这样，但不完全是这样，那么仔细检查可能会发现您需要一些缩放因子。这也是完全可能的，我需要首先处理数据，然后它看起来像他们的程序正在显示的任何东西，即可能需要集成数据点。如果我得到了垃圾，那么它又回到了绘图板上:-)|5278598|我还会查看制造商的网站，或者在他们的二进制文件上运行strings。寻找在生物医学工程领域工作的人也在我的清单上，因为他们可能知道通常使用的是什么协议，如果有的话。我也会寻找这些协议，看看是否有任何协议可以应用于我所看到的数据。|offset|length|style|CODE|5278599|entityMap^0|0|0|0|Q|7|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@$H|R|I|S|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

I would start by seeing what data is being sent by the device, then consider how such data could be represented and packed. 

I would first capture many samples, and see if any pattern presents itself, since heart beat is something which is regular and that would suggest it is measurement related to the heart itself. I would also look for bit fields which are monotonically increasing, as that would suggest some sort of time stamp.

Having formed a hypothesis for what is where, I would write a program to test it and graph the results and see if it makes sense. If it does but not quite, then closer inspection would probably reveal you need some scaling factors here or there. It is also entirely possible I need to process the data first before it looks anything like what their program is showing, i.e. might need to integrate the data points. If I get garbage, then it is back to the drawing board :-)

I would also check the manufacturer's website, or maybe run <code>strings</code> on their binaries. Finding someone who works in the field of biomedical engineering would also be on my list, as they would probably know what protocols are typically used, if any. I would also look for these protocols and see if any could be applied to the data I am seeing.

blocks|key|767123|text|首先，我会创建一个十六进制的数据转储。估计它可能被分成了2次方大小的块。开始寻找重复的模式。想一想他们可能要发送什么样的数据。他们要么单独记录每一次心跳，要么记录传感器以固定间隔发送的任何信息。如果它是个人节拍，那么就会有一个时间增量(从最后一个节拍开始)，一个持续时间，以及某种最大或平均强度。如果它是固定的间隔，那么它可能是一个简单的读数矢量。可能会有某种形式的前言，带有开始时间戳和采样率。您可以尝试自己解码时间戳，也可以简单地将其提供给ctime()，看看他们是否使用标准的绝对时间格式。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|767124|请记住，许多廉价的A/D转换器只产生12位的输出，因此您的读数不太可能大于16位(并且高位的4位可能用于标记)。我建议重置设备，使其为“空白”，转储并存储内容，然后获取一组读数，记录结果(无论设备正常报告的是什么)，然后再次转储内容，并尝试将记录的结果与“空白”转储后出现的任何数据相关联。|767125|entityMap^0|66|7|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

I'd start by creating a hex dump of the data. Figure it's probably blocked in some power-of-two-sized chunks. Start looking for repeating patterns. Think about what kind of data they're probably sending. Either they're recording each heart beat individually, or they're recording whatever the sensor is sending at fixed intervals. If it's individual beats, then there's going to be a time delta (since the last beat), a duration, and a max or avg strength of some sort. If it's fixed intervals, then it'll probably be a simple vector of readings. There'll probably be a preamble of some sort, with a start timestamp and the sampling rate. You can try decoding the timestamp yourself, or you might try simply feeding it to <code>ctime()</code> and see if they're using standard absolute time format.

Keep in mind that lots of cheap A/D converters only produce 12-bit outputs, so your readings are unlikely to be larger than 16 bits (and the high-order 4 bits may be used for flags). I'd recommend resetting the device so that it's "blank", dumping and storing the contents, then take a set of readings, record the results (whatever the device normally reports), then dump the contents again and try to correlate the recorded results with whatever data appeared after the "blank" dump.

blocks|key|3867432|text|我不确定这是否是你想要的，但是Garmin已经创建了一个可以在你的浏览器上运行的API。它似乎支持OSX，以及Windows浏览器...我会在Google+Chromium上尝试一下，看看是否可以用它来代替这种逆向工程……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3867433|http://developer.garmin.com/web-device/garmin-communicator-plugin/|offset|length|3867434|接口功能|style|BOLD|3867435|3867436|自动检测连接到计算机的设备访问设备产品信息，如产品名称和软件版本从支持的娱乐、健身和导航设备读取轨迹、路线和路点写入轨迹、路线和路点到支持的娱乐、健身和导航设备读取健身数据地理编码地址并保存到设备作为路点或收藏夹读写Garmin+XML文件(GPX和TCX)以及二进制文件。支持大多数Garmin设备(USB、USB大容量存储、大多数串行设备)，支持Microsoft+Windows上的Internet+Explorer、Firefox和Chrome。在Mac上支持Safari、Firefox和Chrome。|blockquote|3867437|3867438|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1U|0|0|0|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@$D|11|E|12|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|14|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|C]]]]

Unsure if this is what you're looking for but Garmin has created an API that runs with your browser. It seems OSX is supported, as well as Windows browsers... I would try it from Google Chromium to see if it can be used instead of this reverse engineering...

<a href="http://developer.garmin.com/web-device/garmin-communicator-plugin/" rel="nofollow">http://developer.garmin.com/web-device/garmin-communicator-plugin/</a>

API Features

<blockquote>
 Auto-detection of devices connected to a computer Access to device
 product information like product name and software version Read
 tracks, routes and waypoints from supported recreational, fitness and
 navigation devices Write tracks, routes and waypoints to supported
 recreational, fitness and navigation devices Read fitness data from
 supported fitness devices Geo-code address and save to a device as a
 waypoint or favorite Read and write Garmin XML files (GPX and TCX) as
 well as binary files. Support for most Garmin devices (USB, USB
 mass-storage, most serial devices) Support for Internet Explorer,
 Firefox and Chrome on Microsoft Windows. Support for Safari, Firefox
 and Chrome on Mac OS X.
</blockquote>

blocks|key|3867000|text|你能用电脑扬声器之类的东西来合成心跳吗？(我不知道这些设备实际上是如何工作的)。观察基于不同输入的二进制结果是如何变化的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3867001|拆开设备并检查里面有什么可能也会有帮助。|3867002|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Can you synthesize a heart beat using something like a computer speaker? (I have no idea how such devices actually work). Watch how the binary results change based on different inputs.

Ripping apart the device and checking out what's inside would probably help too.

A friend of mine brought up this questiont he other day, he's recently bought a garmin heart rate moniter device which keeps track of his heart rate and allows him to upload his heart rate stats for a day to his computer.

The only problem is there are no linux drivers for the garmin USB device, he's managed to interpret some of the data, such as the model number and his user details and has identified that there are some binary datatables essentially which we assume represent a series of recordings of his heart rate and the time the recording was taken.

Where does one start when reverse engineering data when you know nothing about the structure?

How would you go about reverse engineering a set of binary data pulled from a device?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我的一个朋友前几天提出了这个问题，他最近买了一个garmin心率监测仪，它可以跟踪他的心率，并允许他将一天的心率数据上传到他的电脑上。唯一的问题是garmin USB设备没有linux驱动程序，他设法解释了一些数据，如型号和他的用户详细信息，并确定了一些二进制数据表，我们假设这些数据表代表了他的心率和记录时间的一系列记录。当你对结构一无所知时，当你对数据进行逆向工程时，你从哪里开始呢？

问如何对从设备中提取的一组二进制数据进行逆向工程？
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