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extmod: Add a2b_base64 and b2a_base64 functions to ubinascii.

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This commit is contained in:
Galen Hazelwood
2015-07-01 22:15:06 -07:00
committed by Paul Sokolovsky
parent b19d273beb
commit 616986a5f3
5 changed files with 159 additions and 2 deletions
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104
extmod/modubinascii.c
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@@ -89,14 +89,114 @@ mp_obj_t mod_binascii_unhexlify(mp_obj_t data) {
}
MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_unhexlify_obj, mod_binascii_unhexlify);
mp_obj_t mod_binascii_a2b_base64(mp_obj_t data) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
if (bufinfo.len % 4 != 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "incorrect padding"));
}
vstr_t vstr;
byte *in = bufinfo.buf;
if (bufinfo.len == 0) {
vstr_init_len(&vstr, 0);
}
else {
vstr_init_len(&vstr, ((bufinfo.len / 4) * 3) - ((in[bufinfo.len-1] == '=') ? ((in[bufinfo.len-2] == '=') ? 2 : 1 ) : 0));
}
byte *out = (byte*)vstr.buf;
for (mp_uint_t i = bufinfo.len; i; i -= 4) {
char hold[4];
for (int j = 4; j--;) {
if (in[j] >= 'A' && in[j] <= 'Z') {
hold[j] = in[j] - 'A';
} else if (in[j] >= 'a' && in[j] <= 'z') {
hold[j] = in[j] - 'a' + 26;
} else if (in[j] >= '0' && in[j] <= '9') {
hold[j] = in[j] - '0' + 52;
} else if (in[j] == '+') {
hold[j] = 62;
} else if (in[j] == '/') {
hold[j] = 63;
} else if (in[j] == '=') {
if (j < 2 || i > 4) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid padding"));
}
hold[j] = 64;
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid character"));
}
}
in += 4;
*out++ = (hold[0]) << 2 | (hold[1]) >> 4;
if (hold[2] != 64) {
*out++ = (hold[1] & 0x0F) << 4 | hold[2] >> 2;
if (hold[3] != 64) {
*out++ = (hold[2] & 0x03) << 6 | hold[3];
}
}
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_a2b_base64_obj, mod_binascii_a2b_base64);
mp_obj_t mod_binascii_b2a_base64(mp_obj_t data) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
vstr_t vstr;
vstr_init_len(&vstr, ((bufinfo.len != 0) ? (((bufinfo.len - 1) / 3) + 1) * 4 : 0) + 1);
byte *in = bufinfo.buf, *out = (byte*)vstr.buf;
for (mp_uint_t i = bufinfo.len; i >= 3; i -= 3) {
*out++ = (in[0] & 0xFC) >> 2;
*out++ = (in[0] & 0x03) << 4 | (in[1] & 0xF0) >> 4;
*out++ = (in[1] & 0x0F) << 2 | (in[2] & 0xC0) >> 6;
*out++ = in[2] & 0x3F;
in += 3;
}
if (bufinfo.len % 3 != 0) {
*out++ = (in[0] & 0xFC) >> 2;
if (bufinfo.len % 3 == 2) {
*out++ = (in[0] & 0x03) << 4 | (in[1] & 0xF0) >> 4;
*out++ = (in[1] & 0x0F) << 2;
}
else {
*out++ = (in[0] & 0x03) << 4;
*out++ = 64;
}
*out++ = 64;
}
out = (byte*)vstr.buf;
for (mp_uint_t i = vstr.len - 1; i--;) {
if (*out < 26) {
*out += 'A';
} else if (*out < 52) {
*out += 'a' - 26;
} else if (*out < 62) {
*out += '0' - 52;
} else if (*out == 62) {
*out ='+';
} else if (*out == 63) {
*out = '/';
} else {
*out = '=';
}
out++;
}
*out = '\n';
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_b2a_base64_obj, mod_binascii_b2a_base64);
#if MICROPY_PY_UBINASCII
STATIC const mp_map_elem_t mp_module_binascii_globals_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_ubinascii) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_hexlify), (mp_obj_t)&mod_binascii_hexlify_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_unhexlify), (mp_obj_t)&mod_binascii_unhexlify_obj },
// { MP_OBJ_NEW_QSTR(MP_QSTR_a2b_base64), (mp_obj_t)&mod_binascii_a2b_base64_obj },
// { MP_OBJ_NEW_QSTR(MP_QSTR_b2a_base64), (mp_obj_t)&mod_binascii_b2a_base64_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_a2b_base64), (mp_obj_t)&mod_binascii_a2b_base64_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_b2a_base64), (mp_obj_t)&mod_binascii_b2a_base64_obj },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_binascii_globals, mp_module_binascii_globals_table);