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pygorithm/pygorithm/binary/base16.py at master · lambdafunc/pygorithm · GitHub
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base16.py
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base16.py
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"""
Binary: Base16
Conversions from base16 to:
- base2
- base10
- ASCII
Author: Ian Doarn
"""
from
pygorithm
.
binary
.
base2
import
to_ascii
as
b2_to_ascii
from
pygorithm
.
binary
.
binary_utils
import
pad
from
math
import
pow
HEX_BINARY_VALUES
=
{
'0'
:
'0000'
,
'1'
:
'0001'
,
'2'
:
'0010'
,
'3'
:
'0011'
,
'4'
:
'0100'
,
'5'
:
'0101'
,
'6'
:
'0110'
,
'7'
:
'0111'
,
'8'
:
'1000'
,
'9'
:
'1001'
,
'A'
:
'1010'
,
'B'
:
'1011'
,
'C'
:
'1100'
,
'D'
:
'1101'
,
'E'
:
'1110'
,
'F'
:
'1111'
}
HEX_LETTER_VALUES
=
{
'0'
:
0
,
'1'
:
1
,
'2'
:
2
,
'3'
:
3
,
'4'
:
4
,
'5'
:
5
,
'6'
:
6
,
'7'
:
7
,
'8'
:
8
,
'9'
:
9
,
'A'
:
10
,
'B'
:
11
,
'C'
:
12
,
'D'
:
13
,
'E'
:
14
,
'F'
:
15
}
def
to_base2
(
h
,
visualize
=
False
):
"""
Convert hexadecimal to binary number
:param h: hexadecimal number
:param visualize: Show process
:return: binary number
"""
hex_char_list
=
list
(
h
)
_list
=
[]
for
value
in
hex_char_list
:
if
visualize
:
print
(
"{} -> {}"
.
format
(
value
,
HEX_BINARY_VALUES
[
value
]
))
_list
.
append
(
pad
(
HEX_BINARY_VALUES
[
value
]))
return
int
(
''
.
join
(
_list
))
def
to_base10
(
h
,
visualize
=
False
):
"""
Convert hexadecimal number to decimal number
Send hex to a list and reverse. Evaluate each hex value
via HEX_LETTER_VALUES map. Enumerate the list,
using the equation: value * 16 ^ index
value is the hex char value: F -> 15
index is its position in the list: ['1', 'A', 'F'] F's index = 2
Continue this for each hex letter until we reach the end of the list,
summing all evaluated values.
:param h: hexadecimal number
:param visualize: Show process
:return: decimal number
"""
# Check to see if '0x' is at the beginning and remove it
if
h
[
0
:
2
]
==
'0x'
:
hex_char_list
=
list
(
h
[
2
:])[::
-
1
]
else
:
hex_char_list
=
list
(
h
)[::
-
1
]
value
=
0
for
i
,
v
in
enumerate
(
hex_char_list
):
if
visualize
:
print
(
"{} -> {} || {} * (16 ^ {}) = {}"
.
format
(
v
,
str
(
HEX_LETTER_VALUES
[
v
]),
str
(
HEX_LETTER_VALUES
[
v
]),
str
(
i
),
str
(
HEX_LETTER_VALUES
[
v
]
*
(
pow
(
16
,
i
)))
))
value
+=
HEX_LETTER_VALUES
[
v
]
*
(
pow
(
16
,
i
))
return
int
(
value
)
def
to_ascii
(
h_array
,
visualize
=
False
):
"""
Convert base16 array to ASCII string
Input must be a list of strings:
Example::
array = [
'74', '68', '65',
'20', '71', '75',
'69', '63', '6B',
'20', '62', '72',
'6F', '77', '6E',
'20', '66', '6F',
'78', '20', '6A',
'75', '6D', '70',
'73', '20', '6F',
'76', '65', '72',
'20', '74', '68',
'65', '20', '6C',
'61', '7A', '79',
'20', '64', '6F',
'67'
]
result -> the quick brown fox jumps over the lazy dog
:param h_array: hex value array
:param visualize: Show process
:return: ASCII string
"""
string
=
''
for
h_value
in
h_array
:
if
visualize
:
print
(
"{} -> {} -> {}"
.
format
(
h_value
,
to_base2
(
h_value
),
b2_to_ascii
(
str
(
to_base2
(
h_value
)))
))
string
+=
b2_to_ascii
(
str
(
to_base2
(
h_value
)))
return
string
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