kopia lustrzana https://github.com/micropython/micropython
273 wiersze
7.8 KiB
C
273 wiersze
7.8 KiB
C
/*
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* This file is part of the Micro Python 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 <assert.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "binary.h"
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// Helpers to work with binary-encoded data
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int mp_binary_get_size(char struct_type, char val_type, uint *palign) {
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int 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':
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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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}
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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':
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align = size = 1; break;
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case 'h': case 'H':
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align = size = sizeof(short); break;
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case 'i': case 'I':
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align = size = sizeof(int); break;
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case 'l': case 'L':
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align = size = sizeof(long); break;
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case 'q': case 'Q':
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// TODO: This is for x86
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align = sizeof(int); size = sizeof(long long); break;
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case 'P': case 'O':
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align = size = sizeof(void*); break;
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}
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}
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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, int index) {
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machine_int_t val = 0;
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switch (typecode) {
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case 'b':
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val = ((int8_t*)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 = ((uint8_t*)p)[index];
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break;
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case 'h':
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val = ((int16_t*)p)[index];
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break;
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case 'H':
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val = ((uint16_t*)p)[index];
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break;
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case 'i':
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case 'l':
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return mp_obj_new_int(((int32_t*)p)[index]);
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case 'I':
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case 'L':
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return mp_obj_new_int_from_uint(((uint32_t*)p)[index]);
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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case 'q':
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case 'Q':
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// TODO: Explode API more to cover signedness
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return mp_obj_new_int_from_ll(((long long*)p)[index]);
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#endif
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#if MICROPY_ENABLE_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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}
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return MP_OBJ_NEW_SMALL_INT(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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uint align;
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int 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*)(((machine_uint_t)p + align - 1) & ~(align - 1));
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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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int delta;
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if (struct_type == '<') {
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delta = -1;
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p += size - 1;
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} else {
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delta = 1;
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}
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machine_int_t val = 0;
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if (is_signed(val_type) && *p & 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 |= *p;
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p += delta;
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}
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*ptr += size;
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if (val_type == 'O') {
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return (mp_obj_t)val;
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} else if (is_signed(val_type)) {
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return mp_obj_new_int(val);
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} else {
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return mp_obj_new_int_from_uint(val);
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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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uint align;
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int 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*)(((machine_uint_t)p + align - 1) & ~(align - 1));
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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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#if MP_ENDIANNESS_BIG
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#error Not implemented
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#endif
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machine_int_t val;
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byte *in = (byte*)&val;
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switch (val_type) {
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case 'O':
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in = (byte*)&val_in;
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break;
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default:
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val = mp_obj_get_int(val_in);
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}
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int in_delta, out_delta;
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uint val_sz = MIN(size, sizeof(val));
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if (struct_type == '>') {
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in_delta = -1;
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out_delta = 1;
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in += val_sz - 1;
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} else {
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in_delta = out_delta = 1;
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}
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for (uint i = val_sz; i > 0; i--) {
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*p = *in;
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p += out_delta;
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in += in_delta;
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}
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*ptr += size;
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}
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void mp_binary_set_val_array(char typecode, void *p, int index, mp_obj_t val_in) {
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switch (typecode) {
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#if MICROPY_ENABLE_FLOAT
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case 'f':
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((float*)p)[index] = mp_obj_float_get(val_in);
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break;
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case 'd':
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((double*)p)[index] = mp_obj_float_get(val_in);
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break;
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#endif
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default:
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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, int index, machine_int_t val) {
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switch (typecode) {
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case 'b':
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((int8_t*)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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val = ((uint8_t*)p)[index] = val;
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break;
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case 'h':
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val = ((int16_t*)p)[index] = val;
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break;
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case 'H':
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val = ((uint16_t*)p)[index] = val;
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break;
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case 'i':
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case 'l':
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((int32_t*)p)[index] = val;
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break;
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case 'I':
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case 'L':
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((uint32_t*)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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case 'Q':
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assert(0);
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((long long*)p)[index] = val;
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break;
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#endif
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#if MICROPY_ENABLE_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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}
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}
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