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extmod/modubinascii: Add "separator" argument to hexlify().

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This is extension to CPython, it allows to easily produce human-readable
hex dump:

>>> ubinascii.hexlify(b"\xaa\x55\xaa\x55", b" ")
b'aa 55 aa 55'
This commit is contained in:
Paul Sokolovsky 2015-12-26 02:12:15 +02:00
parent b4c65c253f
commit 7203b58e87
1 changed files with 11 additions and 2 deletions
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13
extmod/modubinascii.c
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@ -37,12 +37,18 @@
mp_obj_t mod_binascii_hexlify(mp_uint_t n_args, const mp_obj_t *args) {
// Second argument is for an extension to allow a separator to be used
// between values.
(void)n_args;
const char *sep = NULL;
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
vstr_t vstr;
vstr_init_len(&vstr, bufinfo.len * 2);
size_t out_len = bufinfo.len * 2;
if (n_args > 1) {
// 1-char separator between hex numbers
out_len += bufinfo.len - 1;
sep = mp_obj_str_get_str(args[1]);
}
vstr_init_len(&vstr, out_len);
byte *in = bufinfo.buf, *out = (byte*)vstr.buf;
for (mp_uint_t i = bufinfo.len; i--;) {
byte d = (*in >> 4);
@ -55,6 +61,9 @@ mp_obj_t mod_binascii_hexlify(mp_uint_t n_args, const mp_obj_t *args) {
d += 'a' - '9' - 1;
}
*out++ = d + '0';
if (sep != NULL && i != 0) {
*out++ = *sep;
}
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}