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micropython/py/binary.c
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/* | |
* This file is part of the MicroPython project, http://micropython.org/ | |
* | |
* The MIT License (MIT) | |
* | |
* Copyright (c) 2014-2017 Paul Sokolovsky | |
* Copyright (c) 2014-2019 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, size_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 'e': | |
size = 2; | |
break; | |
case 'f': | |
size = 4; | |
break; | |
case 'd': | |
size = 8; | |
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 'e': | |
align = 2; | |
size = 2; | |
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(MP_ERROR_TEXT("bad typecode")); | |
} | |
if (palign != NULL) { | |
*palign = align; | |
} | |
return size; | |
} | |
#if MICROPY_PY_BUILTINS_FLOAT && MICROPY_FLOAT_USE_NATIVE_FLT16 | |
static inline float mp_decode_half_float(uint16_t hf) { | |
union { | |
uint16_t i; | |
_Float16 f; | |
} fpu = { .i = hf }; | |
return fpu.f; | |
} | |
static inline uint16_t mp_encode_half_float(float x) { | |
union { | |
uint16_t i; | |
_Float16 f; | |
} fp_sp = { .f = (_Float16)x }; | |
return fp_sp.i; | |
} | |
#elif MICROPY_PY_BUILTINS_FLOAT | |
static float mp_decode_half_float(uint16_t hf) { | |
union { | |
uint32_t i; | |
float f; | |
} fpu; | |
uint16_t m = hf & 0x3ff; | |
int e = (hf >> 10) & 0x1f; | |
if (e == 0x1f) { | |
// Half-float is infinity. | |
e = 0xff; | |
} else if (e) { | |
// Half-float is normal. | |
e += 127 - 15; | |
} else if (m) { | |
// Half-float is subnormal, make it normal. | |
e = 127 - 15; | |
while (!(m & 0x400)) { | |
m <<= 1; | |
--e; | |
} | |
m -= 0x400; | |
++e; | |
} | |
fpu.i = ((hf & 0x8000) << 16) | (e << 23) | (m << 13); | |
return fpu.f; | |
} | |
static uint16_t mp_encode_half_float(float x) { | |
union { | |
uint32_t i; | |
float f; | |
} fpu = { .f = x }; | |
uint16_t m = (fpu.i >> 13) & 0x3ff; | |
if (fpu.i & (1 << 12)) { | |
// Round up. | |
++m; | |
} | |
int e = (fpu.i >> 23) & 0xff; | |
if (e == 0xff) { | |
// Infinity. | |
e = 0x1f; | |
} else if (e != 0) { | |
e -= 127 - 15; | |
if (e < 0) { | |
// Underflow: denormalized, or zero. | |
if (e >= -11) { | |
m = (m | 0x400) >> -e; | |
if (m & 1) { | |
m = (m >> 1) + 1; | |
} else { | |
m >>= 1; | |
} | |
} else { | |
m = 0; | |
} | |
e = 0; | |
} else if (e > 0x3f) { | |
// Overflow: infinity. | |
e = 0x1f; | |
m = 0; | |
} | |
} | |
uint16_t bits = ((fpu.i >> 16) & 0x8000) | (e << 10) | m; | |
return bits; | |
} | |
#endif | |
mp_obj_t mp_binary_get_val_array(char typecode, void *p, size_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_from_f(((float *)p)[index]); | |
case 'd': | |
return mp_obj_new_float_from_d(((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(size_t size, bool is_signed, bool big_endian, const byte *src) { | |
int delta; | |
if (!big_endian) { | |
delta = -1; | |
src += size - 1; | |
} else { | |
delta = 1; | |
} | |
unsigned 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 *p_base, byte **ptr) { | |
byte *p = *ptr; | |
size_t align; | |
size_t size = mp_binary_get_size(struct_type, val_type, &align); | |
if (struct_type == '@') { | |
// Align p relative to p_base | |
p = p_base + (uintptr_t)MP_ALIGN(p - p_base, 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)); | |
#if MICROPY_PY_BUILTINS_FLOAT | |
} else if (val_type == 'e') { | |
return mp_obj_new_float_from_f(mp_decode_half_float(val)); | |
} else if (val_type == 'f') { | |
union { | |
uint32_t i; | |
float f; | |
} fpu = {val}; | |
return mp_obj_new_float_from_f(fpu.f); | |
} else if (val_type == 'd') { | |
union { | |
uint64_t i; | |
double f; | |
} fpu = {val}; | |
return mp_obj_new_float_from_d(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(size_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 *p_base, byte **ptr) { | |
byte *p = *ptr; | |
size_t align; | |
size_t size = mp_binary_get_size(struct_type, val_type, &align); | |
if (struct_type == '@') { | |
// Align p relative to p_base | |
p = p_base + (uintptr_t)MP_ALIGN(p - p_base, 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 'e': | |
val = mp_encode_half_float(mp_obj_get_float_to_f(val_in)); | |
break; | |
case 'f': { | |
union { | |
uint32_t i; | |
float f; | |
} fp_sp; | |
fp_sp.f = mp_obj_get_float_to_f(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_to_d(val_in); | |
if (MP_BYTES_PER_OBJ_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_exact_type(val_in, &mp_type_int)) { | |
mp_obj_int_to_bytes_impl(val_in, struct_type == '>', size, p); | |
return; | |
} | |
#endif | |
val = mp_obj_get_int(val_in); | |
// zero/sign extend if needed | |
if (MP_BYTES_PER_OBJ_WORD < 8 && size > sizeof(val)) { | |
int c = (mp_int_t)val < 0 ? 0xff : 0x00; | |
memset(p, c, size); | |
if (struct_type == '>') { | |
p += size - sizeof(val); | |
} | |
} | |
break; | |
} | |
mp_binary_set_int(MIN((size_t)size, sizeof(val)), struct_type == '>', p, val); | |
} | |
void mp_binary_set_val_array(char typecode, void *p, size_t index, mp_obj_t val_in) { | |
switch (typecode) { | |
#if MICROPY_PY_BUILTINS_FLOAT | |
case 'f': | |
((float *)p)[index] = mp_obj_get_float_to_f(val_in); | |
break; | |
case 'd': | |
((double *)p)[index] = mp_obj_get_float_to_d(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_exact_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, size_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] = (float)val; | |
break; | |
case 'd': | |
((double *)p)[index] = (double)val; | |
break; | |
#endif | |
// Extension to CPython: array of pointers | |
case 'P': | |
((void **)p)[index] = (void *)(uintptr_t)val; | |
break; | |
} | |
} |