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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include
<stdint.h>
#include
<stdlib.h>
#include
<stddef.h>
#include
<string.h>
#include
<assert.h>
#include
"py/binary.h"
#include
"py/smallint.h"
#include
"py/objint.h"
#include
"py/runtime.h"
// Helpers to work with binary-encoded data
#ifndef
alignof
#define
alignof
(
type
) offsetof(struct { char c; type t; }, t)
#endif
size_t
mp_binary_get_size
(
char
struct_type
,
char
val_type
,
mp_uint_t
*
palign
) {
size_t
size
=
0
;
int
align
=
1
;
switch
(
struct_type
) {
case
'<'
:
case
'>'
:
switch
(
val_type
) {
case
'b'
:
case
'B'
:
size
=
1
;
break
;
case
'h'
:
case
'H'
:
size
=
2
;
break
;
case
'i'
:
case
'I'
:
size
=
4
;
break
;
case
'l'
:
case
'L'
:
size
=
4
;
break
;
case
'q'
:
case
'Q'
:
size
=
8
;
break
;
case
'P'
:
case
'O'
:
case
'S'
:
size
=
sizeof
(
void
*
);
break
;
case
'f'
:
size
=
sizeof
(
float
);
break
;
case
'd'
:
size
=
sizeof
(
double
);
break
;
}
break
;
case
'@'
: {
// TODO:
// The simplest heuristic for alignment is to align by value
// size, but that doesn't work for "bigger than int" types,
// for example, long long may very well have long alignment
// So, we introduce separate alignment handling, but having
// formal support for that is different from actually supporting
// particular (or any) ABI.
switch
(
val_type
) {
case
BYTEARRAY_TYPECODE
:
case
'b'
:
case
'B'
:
align
=
size
=
1
;
break
;
case
'h'
:
case
'H'
:
align
=
alignof(
short
);
size
=
sizeof
(
short
);
break
;
case
'i'
:
case
'I'
:
align
=
alignof(
int
);
size
=
sizeof
(
int
);
break
;
case
'l'
:
case
'L'
:
align
=
alignof(
long
);
size
=
sizeof
(
long
);
break
;
case
'q'
:
case
'Q'
:
align
=
alignof(
long long
);
size
=
sizeof
(
long long
);
break
;
case
'P'
:
case
'O'
:
case
'S'
:
align
=
alignof(
void
*
);
size
=
sizeof
(
void
*
);
break
;
case
'f'
:
align
=
alignof(
float
);
size
=
sizeof
(
float
);
break
;
case
'd'
:
align
=
alignof(
double
);
size
=
sizeof
(
double
);
break
;
}
}
}
if
(
size
==
0
) {
mp_raise_ValueError
(
"bad typecode"
);
}
if
(
palign
!=
NULL
) {
*
palign
=
align
;
}
return
size
;
}
mp_obj_t
mp_binary_get_val_array
(
char
typecode
,
void
*
p
,
mp_uint_t
index
) {
mp_int_t
val
=
0
;
switch
(
typecode
) {
case
'b'
:
val
=
((
signed
char
*
)
p
)[
index
];
break
;
case
BYTEARRAY_TYPECODE
:
case
'B'
:
val
=
((
unsigned
char
*
)
p
)[
index
];
break
;
case
'h'
:
val
=
((
short
*
)
p
)[
index
];
break
;
case
'H'
:
val
=
((
unsigned short
*
)
p
)[
index
];
break
;
case
'i'
:
return
mp_obj_new_int
(((
int
*
)
p
)[
index
]);
case
'I'
:
return
mp_obj_new_int_from_uint
(((
unsigned
int
*
)
p
)[
index
]);
case
'l'
:
return
mp_obj_new_int
(((
long
*
)
p
)[
index
]);
case
'L'
:
return
mp_obj_new_int_from_uint
(((
unsigned long
*
)
p
)[
index
]);
#if
MICROPY_LONGINT_IMPL
!=
MICROPY_LONGINT_IMPL_NONE
case
'q'
:
return
mp_obj_new_int_from_ll
(((
long long
*
)
p
)[
index
]);
case
'Q'
:
return
mp_obj_new_int_from_ull
(((
unsigned long long
*
)
p
)[
index
]);
#endif
#if
MICROPY_PY_BUILTINS_FLOAT
case
'f'
:
return
mp_obj_new_float
((
mp_float_t
)((
float
*
)
p
)[
index
]);
case
'd'
:
return
mp_obj_new_float
(((
double
*
)
p
)[
index
]);
#endif
// Extension to CPython: array of objects
case
'O'
:
return
((
mp_obj_t
*
)
p
)[
index
];
// Extension to CPython: array of pointers
case
'P'
:
return
mp_obj_new_int
((
mp_int_t
)(
uintptr_t
)((
void
*
*
)
p
)[
index
]);
}
return
MP_OBJ_NEW_SMALL_INT
(
val
);
}
// The long long type is guaranteed to hold at least 64 bits, and size is at
// most 8 (for q and Q), so we will always be able to parse the given data
// and fit it into a long long.
long long
mp_binary_get_int
(
mp_uint_t
size
,
bool
is_signed
,
bool
big_endian
,
const
byte
*
src
) {
int
delta
;
if
(!
big_endian
) {
delta
=
-1
;
src
+=
size
-
1
;
}
else
{
delta
=
1
;
}
long long
val
=
0
;
if
(
is_signed
&&
*
src
&
0x80
) {
val
=
-1
;
}
for
(
uint
i
=
0
;
i
<
size
;
i
++
) {
val
<<=
8
;
val
|=
*
src
;
src
+=
delta
;
}
return
val
;
}
#define
is_signed
(
typecode
) (typecode > 'Z')
mp_obj_t
mp_binary_get_val
(
char
struct_type
,
char
val_type
,
byte
*
*
ptr
) {
byte
*
p
=
*
ptr
;
mp_uint_t
align
;
size_t
size
=
mp_binary_get_size
(
struct_type
,
val_type
,
&
align
);
if
(
struct_type
==
'@'
) {
// Make pointer aligned
p
=
(
byte
*
)
MP_ALIGN
(
p
, (
size_t
)
align
);
#if
MP_ENDIANNESS_LITTLE
struct_type
=
'<'
;
#else
struct_type
=
'>'
;
#endif
}
*
ptr
=
p
+
size
;
long long
val
=
mp_binary_get_int
(
size
,
is_signed
(
val_type
), (
struct_type
==
'>'
),
p
);
if
(
val_type
==
'O'
) {
return
(
mp_obj_t
)(
mp_uint_t
)
val
;
}
else
if
(
val_type
==
'S'
) {
const
char
*
s_val
=
(
const
char
*
)(
uintptr_t
)(
mp_uint_t
)
val
;
return
mp_obj_new_str
(
s_val
,
strlen
(
s_val
), false);
#if
MICROPY_PY_BUILTINS_FLOAT
}
else
if
(
val_type
==
'f'
) {
union
{
uint32_t
i
;
float
f
; }
fpu
=
{
val
};
return
mp_obj_new_float
((
mp_float_t
)
fpu
.
f
);
}
else
if
(
val_type
==
'd'
) {
union
{
uint64_t
i
;
double
f
; }
fpu
=
{
val
};
return
mp_obj_new_float
(
fpu
.
f
);
#endif
}
else
if
(
is_signed
(
val_type
)) {
if
((
long long
)
MP_SMALL_INT_MIN
<=
val
&&
val
<= (
long long
)
MP_SMALL_INT_MAX
) {
return
mp_obj_new_int
((
mp_int_t
)
val
);
}
else
{
return
mp_obj_new_int_from_ll
(
val
);
}
}
else
{
if
((
unsigned long long
)
val
<= (
unsigned long long
)
MP_SMALL_INT_MAX
) {
return
mp_obj_new_int_from_uint
((
mp_uint_t
)
val
);
}
else
{
return
mp_obj_new_int_from_ull
(
val
);
}
}
}
void
mp_binary_set_int
(
mp_uint_t
val_sz
,
bool
big_endian
,
byte
*
dest
,
mp_uint_t
val
) {
if
(
MP_ENDIANNESS_LITTLE
&&
!
big_endian
) {
memcpy
(
dest
,
&
val
,
val_sz
);
}
else
if
(
MP_ENDIANNESS_BIG
&&
big_endian
) {
// only copy the least-significant val_sz bytes
memcpy
(
dest
, (
byte
*
)
&
val
+
sizeof
(
mp_uint_t
)
-
val_sz
,
val_sz
);
}
else
{
const
byte
*
src
;
if
(
MP_ENDIANNESS_LITTLE
) {
src
=
(
const
byte
*
)
&
val
+
val_sz
;
}
else
{
src
=
(
const
byte
*
)
&
val
+
sizeof
(
mp_uint_t
);
}
while
(
val_sz
--
) {
*
dest
++
=
*
--
src
;
}
}
}
void
mp_binary_set_val
(
char
struct_type
,
char
val_type
,
mp_obj_t
val_in
,
byte
*
*
ptr
) {
byte
*
p
=
*
ptr
;
mp_uint_t
align
;
size_t
size
=
mp_binary_get_size
(
struct_type
,
val_type
,
&
align
);
if
(
struct_type
==
'@'
) {
// Make pointer aligned
p
=
(
byte
*
)
MP_ALIGN
(
p
, (
size_t
)
align
);
if
(
MP_ENDIANNESS_LITTLE
) {
struct_type
=
'<'
;
}
else
{
struct_type
=
'>'
;
}
}
*
ptr
=
p
+
size
;
mp_uint_t
val
;
switch
(
val_type
) {
case
'O'
:
val
=
(
mp_uint_t
)
val_in
;
break
;
#if
MICROPY_PY_BUILTINS_FLOAT
case
'f'
: {
union
{
uint32_t
i
;
float
f
; }
fp_sp
;
fp_sp
.
f
=
mp_obj_get_float
(
val_in
);
val
=
fp_sp
.
i
;
break
;
}
case
'd'
: {
union
{
uint64_t
i64
;
uint32_t
i32
[
2
];
double
f
; }
fp_dp
;
fp_dp
.
f
=
mp_obj_get_float
(
val_in
);
if
(
BYTES_PER_WORD
==
8
) {
val
=
fp_dp
.
i64
;
}
else
{
int
be
=
struct_type
==
'>'
;
mp_binary_set_int
(
sizeof
(
uint32_t
),
be
,
p
,
fp_dp
.
i32
[
MP_ENDIANNESS_BIG
^
be
]);
p
+=
sizeof
(
uint32_t
);
val
=
fp_dp
.
i32
[
MP_ENDIANNESS_LITTLE
^
be
];
}
break
;
}
#endif
default
:
#if
MICROPY_LONGINT_IMPL
!=
MICROPY_LONGINT_IMPL_NONE
if
(
MP_OBJ_IS_TYPE
(
val_in
,
&
mp_type_int
)) {
mp_obj_int_to_bytes_impl
(
val_in
,
struct_type
==
'>'
,
size
,
p
);
return
;
}
else
#endif
{
val
=
mp_obj_get_int
(
val_in
);
// zero/sign extend if needed
if
(
BYTES_PER_WORD
<
8
&&
size
>
sizeof
(
val
)) {
int
c
=
(
is_signed
(
val_type
)
&&
(
mp_int_t
)
val
<
0
) ?
0xff
:
0x00
;
memset
(
p
,
c
,
size
);
if
(
struct_type
==
'>'
) {
p
+=
size
-
sizeof
(
val
);
}
}
}
}
mp_binary_set_int
(
MIN
((
size_t
)
size
,
sizeof
(
val
)),
struct_type
==
'>'
,
p
,
val
);
}
void
mp_binary_set_val_array
(
char
typecode
,
void
*
p
,
mp_uint_t
index
,
mp_obj_t
val_in
) {
switch
(
typecode
) {
#if
MICROPY_PY_BUILTINS_FLOAT
case
'f'
:
((
float
*
)
p
)[
index
]
=
mp_obj_get_float
(
val_in
);
break
;
case
'd'
:
((
double
*
)
p
)[
index
]
=
mp_obj_get_float
(
val_in
);
break
;
#endif
// Extension to CPython: array of objects
case
'O'
:
((
mp_obj_t
*
)
p
)[
index
]
=
val_in
;
break
;
default
:
#if
MICROPY_LONGINT_IMPL
!=
MICROPY_LONGINT_IMPL_NONE
if
(
MP_OBJ_IS_TYPE
(
val_in
,
&
mp_type_int
)) {
size_t
size
=
mp_binary_get_size
(
'@'
,
typecode
,
NULL
);
mp_obj_int_to_bytes_impl
(
val_in
,
MP_ENDIANNESS_BIG
,
size
, (
uint8_t
*
)
p
+
index
*
size
);
return
;
}
#endif
mp_binary_set_val_array_from_int
(
typecode
,
p
,
index
,
mp_obj_get_int
(
val_in
));
}
}
void
mp_binary_set_val_array_from_int
(
char
typecode
,
void
*
p
,
mp_uint_t
index
,
mp_int_t
val
) {
switch
(
typecode
) {
case
'b'
:
((
signed
char
*
)
p
)[
index
]
=
val
;
break
;
case
BYTEARRAY_TYPECODE
:
case
'B'
:
((
unsigned
char
*
)
p
)[
index
]
=
val
;
break
;
case
'h'
:
((
short
*
)
p
)[
index
]
=
val
;
break
;
case
'H'
:
((
unsigned short
*
)
p
)[
index
]
=
val
;
break
;
case
'i'
:
((
int
*
)
p
)[
index
]
=
val
;
break
;
case
'I'
:
((
unsigned
int
*
)
p
)[
index
]
=
val
;
break
;
case
'l'
:
((
long
*
)
p
)[
index
]
=
val
;
break
;
case
'L'
:
((
unsigned long
*
)
p
)[
index
]
=
val
;
break
;
#if
MICROPY_LONGINT_IMPL
!=
MICROPY_LONGINT_IMPL_NONE
case
'q'
:
((
long long
*
)
p
)[
index
]
=
val
;
break
;
case
'Q'
:
((
unsigned long long
*
)
p
)[
index
]
=
val
;
break
;
#endif
#if
MICROPY_PY_BUILTINS_FLOAT
case
'f'
:
((
float
*
)
p
)[
index
]
=
val
;
break
;
case
'd'
:
((
double
*
)
p
)[
index
]
=
val
;
break
;
#endif
// Extension to CPython: array of pointers
case
'P'
:
((
void
*
*
)
p
)[
index
]
=
(
void
*
)(
uintptr_t
)
val
;
break
;
}
}
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