kopia lustrzana https://github.com/micropython/micropython
434 wiersze
14 KiB
C
434 wiersze
14 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2017 Paul Sokolovsky
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* Copyright (c) 2014-2019 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <assert.h>
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#include "py/binary.h"
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#include "py/smallint.h"
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#include "py/objint.h"
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#include "py/runtime.h"
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// Helpers to work with binary-encoded data
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#ifndef alignof
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#define alignof(type) offsetof(struct { char c; type t; }, t)
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#endif
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size_t mp_binary_get_size(char struct_type, char val_type, size_t *palign) {
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size_t size = 0;
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int align = 1;
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switch (struct_type) {
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case '<':
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case '>':
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switch (val_type) {
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case 'b':
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case 'B':
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size = 1;
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break;
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case 'h':
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case 'H':
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size = 2;
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break;
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case 'i':
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case 'I':
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size = 4;
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break;
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case 'l':
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case 'L':
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size = 4;
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break;
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case 'q':
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case 'Q':
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size = 8;
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break;
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case 'P':
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case 'O':
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case 'S':
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size = sizeof(void *);
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break;
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case 'f':
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size = sizeof(float);
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break;
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case 'd':
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size = sizeof(double);
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break;
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}
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break;
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case '@': {
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// TODO:
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// The simplest heuristic for alignment is to align by value
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// size, but that doesn't work for "bigger than int" types,
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// for example, long long may very well have long alignment
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// So, we introduce separate alignment handling, but having
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// formal support for that is different from actually supporting
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// particular (or any) ABI.
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switch (val_type) {
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case BYTEARRAY_TYPECODE:
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case 'b':
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case 'B':
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align = size = 1;
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break;
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case 'h':
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case 'H':
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align = alignof(short);
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size = sizeof(short);
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break;
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case 'i':
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case 'I':
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align = alignof(int);
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size = sizeof(int);
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break;
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case 'l':
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case 'L':
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align = alignof(long);
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size = sizeof(long);
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break;
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case 'q':
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case 'Q':
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align = alignof(long long);
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size = sizeof(long long);
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break;
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case 'P':
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case 'O':
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case 'S':
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align = alignof(void *);
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size = sizeof(void *);
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break;
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case 'f':
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align = alignof(float);
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size = sizeof(float);
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break;
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case 'd':
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align = alignof(double);
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size = sizeof(double);
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break;
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}
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}
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}
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if (size == 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("bad typecode"));
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}
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if (palign != NULL) {
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*palign = align;
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}
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return size;
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}
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mp_obj_t mp_binary_get_val_array(char typecode, void *p, size_t index) {
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mp_int_t val = 0;
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switch (typecode) {
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case 'b':
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val = ((signed char *)p)[index];
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break;
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case BYTEARRAY_TYPECODE:
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case 'B':
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val = ((unsigned char *)p)[index];
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break;
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case 'h':
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val = ((short *)p)[index];
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break;
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case 'H':
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val = ((unsigned short *)p)[index];
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break;
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case 'i':
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return mp_obj_new_int(((int *)p)[index]);
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case 'I':
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return mp_obj_new_int_from_uint(((unsigned int *)p)[index]);
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case 'l':
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return mp_obj_new_int(((long *)p)[index]);
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case 'L':
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return mp_obj_new_int_from_uint(((unsigned long *)p)[index]);
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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case 'q':
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return mp_obj_new_int_from_ll(((long long *)p)[index]);
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case 'Q':
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return mp_obj_new_int_from_ull(((unsigned long long *)p)[index]);
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#endif
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#if MICROPY_PY_BUILTINS_FLOAT
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case 'f':
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return mp_obj_new_float_from_f(((float *)p)[index]);
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case 'd':
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return mp_obj_new_float_from_d(((double *)p)[index]);
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#endif
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// Extension to CPython: array of objects
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case 'O':
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return ((mp_obj_t *)p)[index];
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// Extension to CPython: array of pointers
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case 'P':
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return mp_obj_new_int((mp_int_t)(uintptr_t)((void **)p)[index]);
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}
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return MP_OBJ_NEW_SMALL_INT(val);
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}
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// The long long type is guaranteed to hold at least 64 bits, and size is at
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// most 8 (for q and Q), so we will always be able to parse the given data
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// and fit it into a long long.
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long long mp_binary_get_int(size_t size, bool is_signed, bool big_endian, const byte *src) {
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int delta;
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if (!big_endian) {
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delta = -1;
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src += size - 1;
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} else {
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delta = 1;
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}
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long long val = 0;
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if (is_signed && *src & 0x80) {
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val = -1;
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}
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for (uint i = 0; i < size; i++) {
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val <<= 8;
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val |= *src;
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src += delta;
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}
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return val;
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}
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#define is_signed(typecode) (typecode > 'Z')
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mp_obj_t mp_binary_get_val(char struct_type, char val_type, byte *p_base, byte **ptr) {
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byte *p = *ptr;
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size_t align;
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size_t size = mp_binary_get_size(struct_type, val_type, &align);
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if (struct_type == '@') {
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// Align p relative to p_base
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p = p_base + (uintptr_t)MP_ALIGN(p - p_base, align);
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#if MP_ENDIANNESS_LITTLE
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struct_type = '<';
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#else
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struct_type = '>';
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#endif
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}
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*ptr = p + size;
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long long val = mp_binary_get_int(size, is_signed(val_type), (struct_type == '>'), p);
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if (val_type == 'O') {
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return (mp_obj_t)(mp_uint_t)val;
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} else if (val_type == 'S') {
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const char *s_val = (const char *)(uintptr_t)(mp_uint_t)val;
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return mp_obj_new_str(s_val, strlen(s_val));
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#if MICROPY_PY_BUILTINS_FLOAT
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} else if (val_type == 'f') {
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union { uint32_t i;
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float f;
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} fpu = {val};
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return mp_obj_new_float_from_f(fpu.f);
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} else if (val_type == 'd') {
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union { uint64_t i;
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double f;
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} fpu = {val};
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return mp_obj_new_float_from_d(fpu.f);
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#endif
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} else if (is_signed(val_type)) {
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if ((long long)MP_SMALL_INT_MIN <= val && val <= (long long)MP_SMALL_INT_MAX) {
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return mp_obj_new_int((mp_int_t)val);
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} else {
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return mp_obj_new_int_from_ll(val);
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}
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} else {
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if ((unsigned long long)val <= (unsigned long long)MP_SMALL_INT_MAX) {
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return mp_obj_new_int_from_uint((mp_uint_t)val);
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} else {
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return mp_obj_new_int_from_ull(val);
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}
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}
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}
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void mp_binary_set_int(size_t val_sz, bool big_endian, byte *dest, mp_uint_t val) {
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if (MP_ENDIANNESS_LITTLE && !big_endian) {
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memcpy(dest, &val, val_sz);
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} else if (MP_ENDIANNESS_BIG && big_endian) {
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// only copy the least-significant val_sz bytes
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memcpy(dest, (byte *)&val + sizeof(mp_uint_t) - val_sz, val_sz);
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} else {
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const byte *src;
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if (MP_ENDIANNESS_LITTLE) {
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src = (const byte *)&val + val_sz;
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} else {
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src = (const byte *)&val + sizeof(mp_uint_t);
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}
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while (val_sz--) {
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*dest++ = *--src;
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}
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}
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}
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void mp_binary_set_val(char struct_type, char val_type, mp_obj_t val_in, byte *p_base, byte **ptr) {
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byte *p = *ptr;
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size_t align;
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size_t size = mp_binary_get_size(struct_type, val_type, &align);
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if (struct_type == '@') {
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// Align p relative to p_base
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p = p_base + (uintptr_t)MP_ALIGN(p - p_base, align);
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if (MP_ENDIANNESS_LITTLE) {
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struct_type = '<';
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} else {
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struct_type = '>';
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}
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}
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*ptr = p + size;
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mp_uint_t val;
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switch (val_type) {
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case 'O':
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val = (mp_uint_t)val_in;
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break;
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#if MICROPY_PY_BUILTINS_FLOAT
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case 'f': {
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union { uint32_t i;
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float f;
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} fp_sp;
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fp_sp.f = mp_obj_get_float_to_f(val_in);
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val = fp_sp.i;
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break;
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}
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case 'd': {
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union { uint64_t i64;
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uint32_t i32[2];
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double f;
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} fp_dp;
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fp_dp.f = mp_obj_get_float_to_d(val_in);
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if (BYTES_PER_WORD == 8) {
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val = fp_dp.i64;
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} else {
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int be = struct_type == '>';
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mp_binary_set_int(sizeof(uint32_t), be, p, fp_dp.i32[MP_ENDIANNESS_BIG ^ be]);
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p += sizeof(uint32_t);
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val = fp_dp.i32[MP_ENDIANNESS_LITTLE ^ be];
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}
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break;
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}
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#endif
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default:
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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if (mp_obj_is_type(val_in, &mp_type_int)) {
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mp_obj_int_to_bytes_impl(val_in, struct_type == '>', size, p);
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return;
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}
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#endif
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val = mp_obj_get_int(val_in);
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// zero/sign extend if needed
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if (BYTES_PER_WORD < 8 && size > sizeof(val)) {
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int c = (mp_int_t)val < 0 ? 0xff : 0x00;
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memset(p, c, size);
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if (struct_type == '>') {
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p += size - sizeof(val);
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}
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}
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break;
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}
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mp_binary_set_int(MIN((size_t)size, sizeof(val)), struct_type == '>', p, val);
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}
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void mp_binary_set_val_array(char typecode, void *p, size_t index, mp_obj_t val_in) {
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switch (typecode) {
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#if MICROPY_PY_BUILTINS_FLOAT
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case 'f':
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((float *)p)[index] = mp_obj_get_float_to_f(val_in);
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break;
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case 'd':
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((double *)p)[index] = mp_obj_get_float_to_d(val_in);
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break;
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#endif
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// Extension to CPython: array of objects
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case 'O':
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((mp_obj_t *)p)[index] = val_in;
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break;
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default:
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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if (mp_obj_is_type(val_in, &mp_type_int)) {
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size_t size = mp_binary_get_size('@', typecode, NULL);
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mp_obj_int_to_bytes_impl(val_in, MP_ENDIANNESS_BIG,
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size, (uint8_t *)p + index * size);
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return;
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}
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#endif
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mp_binary_set_val_array_from_int(typecode, p, index, mp_obj_get_int(val_in));
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}
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}
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void mp_binary_set_val_array_from_int(char typecode, void *p, size_t index, mp_int_t val) {
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switch (typecode) {
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case 'b':
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((signed char *)p)[index] = val;
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break;
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case BYTEARRAY_TYPECODE:
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case 'B':
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((unsigned char *)p)[index] = val;
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break;
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case 'h':
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((short *)p)[index] = val;
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break;
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case 'H':
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((unsigned short *)p)[index] = val;
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break;
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case 'i':
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((int *)p)[index] = val;
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break;
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case 'I':
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((unsigned int *)p)[index] = val;
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break;
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case 'l':
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((long *)p)[index] = val;
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break;
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case 'L':
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((unsigned long *)p)[index] = val;
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break;
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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case 'q':
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((long long *)p)[index] = val;
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break;
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case 'Q':
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((unsigned long long *)p)[index] = val;
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break;
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#endif
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#if MICROPY_PY_BUILTINS_FLOAT
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case 'f':
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((float *)p)[index] = (float)val;
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break;
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case 'd':
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((double *)p)[index] = (double)val;
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break;
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#endif
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// Extension to CPython: array of pointers
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case 'P':
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((void **)p)[index] = (void *)(uintptr_t)val;
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break;
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}
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}
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