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-rwxr-xr-xdumpbits.py101
1 files changed, 101 insertions, 0 deletions
diff --git a/dumpbits.py b/dumpbits.py
new file mode 100755
index 0000000..a30afde
--- /dev/null
+++ b/dumpbits.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+import sys, re, traceback
+from argparse import ArgumentParser
+
+def convert(s):
+ if s.lower().startswith('0x'):
+ return int(s, 16)
+ elif s.lower().startswith('0b'):
+ return int(s, 2)
+ else:
+ return int(s)
+
+class Table:
+ def __init__(self, value, numbers):
+ self.value = value
+ self.numbers = numbers
+
+ def print(self):
+ self.print_border()
+ self.print_numbers()
+ self.print_border()
+ self.print_bits()
+ self.print_border()
+
+ def print_border(self):
+ total_w = 4 * len(self.numbers) + 2
+ for i in range(total_w):
+ c = '+' if i == 0 or i == total_w-1 else '-'
+ print(c, end='')
+ print()
+
+ def print_numbers(self):
+ print('|', end='')
+ for n in reversed(self.numbers):
+ print(' %s ' % (str(n).rjust(2)), end='')
+ print('|')
+
+ def print_bits(self):
+ print('|', end='')
+ for n in reversed(self.numbers):
+ b = (self.value >> n) & 1
+ print(' %s ' % (str(b).rjust(2)), end='')
+ print('|')
+
+def main():
+ parser = ArgumentParser(description='inspect values by bits')
+ parser.add_argument('-s', '--size', type=int, default=32, choices=(4, 8, 16, 32, 64),
+ help='size')
+ parser.add_argument('-r', '--range',
+ help='range (e.g. 31:28), numbers are inclusive')
+ parser.add_argument('value')
+ args = parser.parse_args()
+
+ value = convert(args.value)
+
+ if value.bit_length() > args.size:
+ raise Exception('bit length of %s is %d which is larger than specified size %d'
+ % (args.value, value.bit_length(), args.size))
+
+ if args.range:
+ r = re.search('^(\d+):(\d+)$', args.range)
+ if not r:
+ raise Exception('invalid range specified')
+
+ r_to = int(r.group(2))
+ r_from = int(r.group(1))
+
+ if r_to < 0 or r_from < 0 or r_to >= args.size or r_from >= args.size:
+ raise Exception('specified range is out of bounds')
+ else:
+ r_to = 0
+ r_from = args.size - 1
+
+ numbers = range(r_to, r_from + 1)
+
+ table = Table(value, numbers)
+ table.print()
+
+ print()
+ print(' Input: %s' % args.value)
+ print(' Binary: %s' % bin(value)[2:])
+ print('Decimal: %d' % value)
+ print(' Hex: %s' % hex(value)[2:])
+ print()
+
+ if args.range:
+ new_value = value >> r_to
+ mask = (2 ** (r_from - r_to + 1) - 1)
+ new_value &= mask
+
+ print(' [%d:%d]' % (r_from, r_to))
+ print(' Binary: %s' % bin(new_value)[2:])
+ print('Decimal: %d' % new_value)
+ print(' Hex: %s' % hex(new_value)[2:])
+
+if __name__ == '__main__':
+ try:
+ main()
+ except Exception as e:
+ print("error: %s" % str(e))
+ traceback.print_tb(e.__traceback__)