#!/usr/bin/python
import hashlib

f="/home/agagag/media/images/dentro2.jpg"
s=open(f)
source=s.read()
m = hashlib.md5()
m.update(source)
m.update(source)
raw=m.digest()
dgst_raw=bytearray(raw)
print "hexdigest of input file %s : %s "  % (f, m.hexdigest(),)
print "length in bytes : %d"  % m.digest_size



# FLDBASE got to be even 
FLDBASE=8
FLDSIZE_Y=(FLDBASE + 1)
FLDSIZE_X=(FLDBASE * 2 + 1)

augmentation_string = " .o+=*BOX@%&#/^SE"
dgst_size=m.digest_size

# create a 2d array and fill it up with dots
field = [['.' for x in range(FLDSIZE_X)] for y in range(FLDSIZE_Y)]


length=len(augmentation_string)-1


# we start in the center.
x = FLDSIZE_X / 2
y = FLDSIZE_Y / 2

field[y][x]='x'
print "Initial value of x %d" % x
print "Initial value of y %d" % y

# process raw key
for i in range(0,dgst_size):
    mybyte= dgst_raw[i]
    
    if  mybyte > 128:
        y+=1
        x+=1
        field[y][x]='>'
        print 'x', x,
        if x==0 or y==0:
            x = max(x, 0)
            y = max(y, 0)
        else:
            if x > FLDSIZE_X-1 or y > FLDSIZE_Y-1:
                x = min(x, FLDSIZE_X - 1)
                y = min(y, FLDSIZE_Y - 1)
    else:
        if mybyte < 128:
            x-=1
            y-=1 
            field[y][x]='<'
            print 'y', y,

#print rows
for row in field:
    print "".join(row)