Month: February 2010

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eDonkey2000 Hash in Python

As part of a filesystem watcher program I maintain as part of a larger site, I need to obtain the ed2k hash of some files. Believe me when I tell you I have searched high and low for an Edonkey2000 hash algorithm in python. I’ve seen massive libraries that scared the bejesus out of me, but nothing clean, concise, and without external dependencies. Enjoy the below. It’s worth noting it’s just as fast as the C version.

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import hashlib
 
def hash_file(self, file_path):
    """ Returns the ed2k hash of a given file. """
 
    md4 = hashlib.new('md4').copy
 
    def gen(f):
        while True:
            x = f.read(9728000)
            if x: yield x
            else: return
 
    def md4_hash(data):
        m = md4()
        m.update(data)
        return m
 
    with open(file_path, 'rb') as f:
        a = gen(f)
        hashes = [md4_hash(data).digest() for data in a]
        if len(hashes) == 1:
            return hashes[0].encode("hex")
        else: return md4_hash(reduce(lambda a,d: a + d, hashes, "")).hexdigest()
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Linux Hates my Palm Pre

For the life of me, I can not get my desktop Linux to recognize (and thus charge or give filesystem access to) my Palm Pre. Apparently no one else on the Internet has this problem.

I’ve tried enabling low level usb debugging in the kernel, and I can see when I plug the device in:

usb 7-5.1.3: no configuration chosen from 1 choice

If I reboot the device, I see it automount for half a second during its “bootup” phase, having:

usb 7-5.1.3: configuration #1 chosen from 1 choice
sd 20:0:0:0: [sdf] Attached SCSI removable disk

But then it defaults to nothing once again. Works fine in Windows, which pains me to say. Works fine also when my computer itself boots up- Pre must negotiate with the hardware directly since the “charge” menu shows up… but once the Linux kernel kicks in, that’s all over.

It’s not a lack of power on the USB bus, I can trigger that error by other means, but it’s certainly not one of the log lines normally.

Ideas? I’m running out of my own.

My kernel: 2.6.31-gentoo-r6 SMP

EDIT:
“Solution”: root into the pre. execute as root:

usbnet disable

/sbin/reboot