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from pypy.interpreter.error import oefmt
from pypy.interpreter.gateway import unwrap_spec
from rpython.rlib.rstring import StringBuilder
from rpython.rlib.rarithmetic import ovfcheck
from pypy.module.binascii.interp_binascii import raise_Error
from pypy.module.binascii.interp_binascii import AsciiBufferUnwrapper
# ____________________________________________________________
def _value2char(value):
if value < 10:
return chr(ord('0') + value)
else:
return chr((ord('a')-10) + value)
_value2char._always_inline_ = True
@unwrap_spec(data='bufferstr')
def hexlify(space, data, w_sep=None, w_bytes_per_sep=None):
'''Hexadecimal representation of binary data.
sep
An optional single character or byte to separate hex bytes.
bytes_per_sep
How many bytes between separators. Positive values count from the
right, negative values count from the left.
The return value is a bytes object. This function is also
available as "b2a_hex()".'''
from pypy.objspace.std.bytearrayobject import _array_to_hexstring, unwrap_hex_sep_arguments
from pypy.interpreter.buffer import StringBuffer
sep, bytes_per_sep = unwrap_hex_sep_arguments(space, w_sep, w_bytes_per_sep)
w_res = _array_to_hexstring(space, StringBuffer(data), 0, 1,
len(data), sep=sep, bytes_per_sep=bytes_per_sep)
# it's a string, need to turn it into a bytes
return space.newbytes(space.text_w(w_res))
# ____________________________________________________________
def _char2value(space, c):
if c <= '9':
if c >= '0':
return ord(c) - ord('0')
elif c <= 'F':
if c >= 'A':
return ord(c) - (ord('A')-10)
elif c <= 'f':
if c >= 'a':
return ord(c) - (ord('a')-10)
raise_Error(space, 'Non-hexadecimal digit found')
_char2value._always_inline_ = True
@unwrap_spec(hexstr=AsciiBufferUnwrapper)
def unhexlify(space, hexstr):
'''Binary data of hexadecimal representation.
hexstr must contain an even number of hex digits (upper or lower case).
This function is also available as "unhexlify()".'''
if len(hexstr) & 1:
raise_Error(space, 'Odd-length string')
res = StringBuilder(len(hexstr) >> 1)
for i in range(0, len(hexstr), 2):
a = _char2value(space, hexstr[i])
b = _char2value(space, hexstr[i+1])
res.append(chr((a << 4) | b))
return space.newbytes(res.build())
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