Source Code for Module biana.utilities.int_ascii

  1  """ 
  2      BIANA: Biologic Interactions and Network Analysis 
  3      Copyright (C) 2009  Javier Garcia-Garcia, Emre Guney, Baldo Oliva 
  4   
  5      This program is free software: you can redistribute it and/or modify 
  6      it under the terms of the GNU General Public License as published by 
  7      the Free Software Foundation, either version 3 of the License, or 
  8      (at your option) any later version. 
  9   
 10      This program is distributed in the hope that it will be useful, 
 11      but WITHOUT ANY WARRANTY; without even the implied warranty of 
 12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 13      GNU General Public License for more details. 
 14   
 15      You should have received a copy of the GNU General Public License 
 16      along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 17   
 18  """ 
 19   
 20  #PRIMARY METHODS 
 21   
 22  # For signed and unsigned values 
 23   
 24 -def int_to_ascii(max_bytes,value): 
 25      value = int(value) 
 26      if value<0: 
 27          value = -1*value | pow(2,max_bytes*8-1) 
 28      temp = [ '\x00' for x in xrange(max_bytes) ] 
 29      del x 
 30      pos = max_bytes-1 
 31      while value>255: 
 32          temp[pos] = chr(value%255) 
 33          pos-=1 
 34          value/=255 
 35      if value==255: temp[pos] = chr(255) 
 36      else: temp[pos] = chr(value%255) 
 37      return "".join(temp) 
 38   
 39 -def ascii_to_int(ascii): 
 40      value = 0 
 41      pos = len(ascii)-1 
 42      for x in xrange(len(ascii)): 
 43          value += ord(ascii[x])*pow(255,pos) 
 44          pos-=1 
 45      if ord(ascii[0])&128: 
 46          return -1* value ^ pow(2,len(ascii)*8-1) 
 47      else: 
 48          return value 
 49   
 50   
 51  # For unsigned values 
 52   
 53 -def unsigned_int_to_ascii(max_bytes,value): 
 54   
 55      value = int(value) 
 56      temp = [ '\x00' for x in xrange(max_bytes) ] 
 57      del x 
 58      pos = max_bytes-1 
 59      while value>255: 
 60          temp[pos] = chr(value%255) 
 61          pos-=1 
 62          value/=255 
 63      if value==255: temp[pos] = chr(255) 
 64      else: temp[pos] = chr(value%255) 
 65   
 66      return "".join(temp) 
 67   
 68   
 69 -def ascii_to_unsigned_int(ascii): 
 70   
 71      value = 0 
 72   
 73      pos = len(ascii)-1 
 74       
 75      for x in xrange(len(ascii)): 
 76          value += ord(ascii[x])*pow(255,pos) 
 77          pos-=1 
 78   
 79      return value 
 80   
 81   
 82   
 83  # DERIVED METHODS 
 84   
 85 -def unsigned_float_to_ascii(bytes,dec_positions,value): 
 86   
 87      return unsigned_int_to_ascii(bytes,float(value)*pow(10,dec_positions)) 
 88       
 89 -def ascii_to_unsigned_float(dec_positions, ascii): 
 90   
 91      return ascii_to_unsigned_int(ascii)/float(pow(10,dec_positions)) 
 92   
 93 -def float_to_ascii(bytes,dec_positions,value): 
 94   
 95      return int_to_ascii(bytes,float(value)*pow(10,dec_positions)) 
 96   
 97 -def ascii_to_float(dec_positions,ascii): 
 98   
 99      return ascii_to_int(ascii)/float(pow(10,dec_positions)) 
100   
101   
102   
103  # ITERATIVE METHODS 
104   
105   
106 -def unsigned_int_list_to_ascii(bytes,list): 
107   
108      return "".join( [unsigned_int_to_ascii(bytes,x) for x in list] ) 
109   
110 -def ascii_to_unsigned_int_list(bytes,ascii): 
111   
112      return [ ascii_to_unsigned_int(ascii[x:x+bytes]) for x in xrange(0,len(ascii),bytes)] 
113   
114 -def unsigned_float_list_to_ascii(int_bytes,dec_bytes,list): 
115   
116      return "".join( [unsigned_float_to_ascii(int_bytes,dec_bytes,x) for x in list] ) 
117   
118 -def ascii_to_unsigned_float_list(bytes,dec_bytes,ascii): 
119   
120      return [ ascii_to_unsigned_float(dec_bytes,ascii[x:x+bytes]) for x in xrange(0,len(ascii),bytes)] 
121   
122   
123 -def int_list_to_ascii(bytes,list): 
124   
125      return "".join( [int_to_ascii(bytes,x) for x in list] ) 
126   
127 -def ascii_to_int_list(bytes,ascii): 
128   
129      return [ ascii_to_int(ascii[x:x+bytes]) for x in xrange(0,len(ascii),bytes)] 
130   
131 -def float_list_to_ascii(int_bytes,dec_bytes,list): 
132   
133      return "".join( [float_to_ascii(int_bytes,dec_bytes,x) for x in list] ) 
134   
135 -def ascii_to_float_list(bytes,dec_bytes,ascii): 
136   
137      return [ ascii_to_float(dec_bytes,ascii[x:x+bytes]) for x in xrange(0,len(ascii),bytes)] 
138