Escapes???

[Darrell Gallion]

Arinté wrote:
> I am trying to write this escape seq to a device from python
> "H\x1b\x23\x12art\x1b\x23\x01\n"
> The \x1b\x23\x12 is supposed to be a command tell the device to do
something
> special with "art", but python is making it look like this \x1b\x23\x12a
> "rt".  Am I missing something on how to work with escape sequences?  Is
> there another way to write hex values in a string.  I rather us \x00
because
> that is what are testers are familiar with.
>
Hope this is useful. I've been meaning to write this sort of thing for a
while.
--Darrell Gallion

import re, string, struct

hexData1='''
0016 4210 0100 0004 0000 0101 c042 0100
0242 0500 000f
'''
hexData2='''
0x0016 0x4210 0x0100 0x0004 0x0000 0x0101 0xc042 0x0100
0x0242 0x0500 0x000f
'''
hexData3=r'''
\x0016 \x4210 \x0100 \x0004 \x0000 \x0101 \xc042 \x0100
\x0242 \x0500 \x000f
'''
hexData3=r'''
\x00\x16 \x42\x10 \x01\x00 \x00\x04 \x00\x00 \x01\x01 \xc0\x42 \x01\x00
\x02\x42 \x05\x00 \x00\x0f
'''
hexData3=r'''
\x00\x16 \x42\x10 \x01\x00 \x00\x04 \x00\x00 \x01\x01 \xc0\x42 \x01\x00
\x02\x42 \x05\x00 \x00\x0f
'''
hexData4=r'''
0x0016 \x42\x10 0100 \x0004 \x00\x00 \x01\x01 \xc0\x42 \x01\x00
\x02\x42 \x05\x00 \x00\x0f
'''

bigEndian={1:"c", 2:"c", 3:">h", 4:">h", 5:">l", 6:">l"}
def binConvert(s, sizeMap={1:"c", 2:"c", 3:"h", 4:"h", 5:"l", 6:"l"}):
    """
    Convert s to binary
    s can be formated like:
    0xabcd \x11 \x9999 abcd

    sizeMap maps the size of each number to a struct format string
    for it's conversion. bigEndian was used for regression so that
    r"\x00\x16" == r"\x0016"
    """
    res=[]
    temp = re.findall(r"(?i)[^ \\x\n\t]+(?!x)",s)
    fmt=sizeMap[len(temp[0])]
    for v in temp:
        if fmt != 'c':
            res.append(struct.pack(fmt, eval("0x"+v)))
        else:
            res.append(struct.pack(fmt, eval(r'"\x%s"'%v)))

    return string.join(res,'')

def hexConvert(s, size=1, outPutStyle="0x%s "):
    """
    Convert binary string s to a hex format
    size        ==> how large should each hex value be
    outPutStyle ==> how should each value be formated
    """
    res=[]
    while s:
        temp=s[:size]
        s=s[size:]
        l=[]
        for i in temp:
            l.append("%x"%ord(i))
        val=string.join(l,'')
        res.append(outPutStyle%val)

    return string.join(res,'')

def regress(show=0):
    lastB=None
    for k,v in globals().items():
        if re.match("hexData", k):
            print 'Testing:', k
            b=binConvert(v, bigEndian)
            h=hexConvert(b)
            if show:
                print b
                print h
                print '-'*50
            assert(b==binConvert(h, bigEndian))
            if lastB:
                assert(b==LastB)
                lastB=b

regress(1)



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