317 lines
9.9 KiB
C
317 lines
9.9 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 <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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// 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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int mp_binary_get_size(char struct_type, char val_type, mp_uint_t *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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case 'P': case 'O': case 'S':
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size = sizeof(void*); break;
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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':
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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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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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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 (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 = ((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_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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}
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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 <<= 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 **ptr) {
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byte *p = *ptr;
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mp_uint_t 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*)(((mp_uint_t)p + align - 1) & ~((mp_uint_t)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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*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*)(mp_uint_t)val;
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return mp_obj_new_str(s_val, strlen(s_val), false);
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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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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*)(((mp_uint_t)p + align - 1) & ~((mp_uint_t)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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}
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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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default:
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// we handle large ints here by calling the truncated accessor
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if (MP_OBJ_IS_TYPE(val_in, &mp_type_int)) {
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val = mp_obj_int_get_truncated(val_in);
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} else {
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val = mp_obj_get_int(val_in);
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}
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}
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mp_binary_set_int(MIN(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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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, mp_uint_t index, mp_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_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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}
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}
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