0d96f1906b
Left shift of negative numbers is undefined in the "C" standard. Multiplying by 256 has the intended effect (in the absence of integer overflow, anyway), can be implemented using the same shift instruction, but does not invoke undefined behavior. This problem was found using clang 7's scan-build static analyzer.
426 lines
14 KiB
C
426 lines
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) 2013, 2014 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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#include "supervisor/shared/translate.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, mp_uint_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 '<': case '>':
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switch (val_type) {
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case 'b': case 'B': case 'x':
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size = 1; break;
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case 'h': case 'H':
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size = 2; break;
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case 'i': case 'I':
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size = 4; break;
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case 'l': case 'L':
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size = 4; break;
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case 'q': case 'Q':
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size = 8; break;
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#if MICROPY_NONSTANDARD_TYPECODES
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case 'P': case 'O': case 'S':
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size = sizeof(void*); break;
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#endif
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case 'f':
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size = sizeof(float); break;
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case 'd':
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size = sizeof(double); 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': case 'B': case 'x':
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align = size = 1; break;
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case 'h': case 'H':
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align = alignof(short);
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size = sizeof(short); break;
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case 'i': case 'I':
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align = alignof(int);
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size = sizeof(int); break;
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case 'l': case 'L':
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align = alignof(long);
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size = sizeof(long); break;
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case 'q': case 'Q':
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align = alignof(long long);
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size = sizeof(long long); break;
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#if MICROPY_NONSTANDARD_TYPECODES
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case 'P': case 'O': case 'S':
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align = alignof(void*);
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size = sizeof(void*); break;
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#endif
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case 'f':
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align = alignof(float);
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size = sizeof(float); break;
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case 'd':
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align = alignof(double);
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size = sizeof(double); 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(translate("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, mp_uint_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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case 'x': // value will be discarded
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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(((float*)p)[index]);
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case 'd':
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return mp_obj_new_float(((double*)p)[index]);
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#endif
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#if MICROPY_NONSTANDARD_TYPECODES
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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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#endif
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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(mp_uint_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 *= 256;
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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 **ptr) {
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byte *p = *ptr;
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mp_uint_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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// Make pointer aligned
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p = (byte*)MP_ALIGN(p, (size_t)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 (MICROPY_NONSTANDARD_TYPECODES && (val_type == 'O')) {
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return (mp_obj_t)(mp_uint_t)val;
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#if MICROPY_NONSTANDARD_TYPECODES
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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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#endif
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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; float f; } fpu = {val};
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return mp_obj_new_float((mp_float_t) fpu.f);
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} else if (val_type == 'd') {
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union { uint64_t i; double f; } fpu = {val};
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return mp_obj_new_float(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(mp_uint_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 **ptr) {
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byte *p = *ptr;
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mp_uint_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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// Make pointer aligned
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p = (byte*)MP_ALIGN(p, (size_t)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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#if MICROPY_NONSTANDARD_TYPECODES
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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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#endif
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#if MICROPY_PY_BUILTINS_FLOAT
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case 'f': {
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union { uint32_t i; float f; } fp_sp;
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fp_sp.f = mp_obj_get_float(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; uint32_t i32[2]; double f; } fp_dp;
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fp_dp.f = mp_obj_get_float(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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bool signed_type = is_signed(val_type);
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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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// It's a longint.
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mp_obj_int_buffer_overflow_check(val_in, size, signed_type);
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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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} else
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#endif
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{
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val = mp_obj_get_int(val_in);
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// Small int checking is separate, to be fast.
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mp_small_int_buffer_overflow_check(val, size, signed_type);
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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 = (is_signed(val_type) && (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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}
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}
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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, mp_uint_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(val_in);
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break;
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case 'd':
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((double*)p)[index] = mp_obj_get_float(val_in);
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break;
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#endif
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#if MICROPY_NONSTANDARD_TYPECODES
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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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#endif
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default: {
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size_t size = mp_binary_get_size('@', typecode, NULL);
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bool signed_type = is_signed(typecode);
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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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// It's a long int.
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mp_obj_int_buffer_overflow_check(val_in, size, signed_type);
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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_int_t val = mp_obj_get_int(val_in);
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// Small int checking is separate, to be fast.
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mp_small_int_buffer_overflow_check(val, size, signed_type);
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mp_binary_set_val_array_from_int(typecode, p, index, val);
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}
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}
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}
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void mp_binary_set_val_array_from_int(char typecode, void *p, mp_uint_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 'x':
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((unsigned char*)p)[index] = 0;
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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] = val;
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break;
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case 'd':
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((double*)p)[index] = val;
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break;
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#endif
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#if MICROPY_NONSTANDARD_TYPECODES
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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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#endif
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}
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}
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