140 lines
4.5 KiB
C
140 lines
4.5 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 <assert.h>
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#include <string.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 "builtin.h"
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#include "objtuple.h"
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#include "objstr.h"
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#include "binary.h"
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#if MICROPY_ENABLE_MOD_STRUCT
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STATIC char get_fmt_type(const char **fmt) {
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char t = **fmt;
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switch (t) {
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case '!':
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t = '>';
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break;
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case '@':
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case '=':
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case '<':
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case '>':
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break;
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default:
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return '@';
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}
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// Skip type char
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(*fmt)++;
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return t;
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}
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STATIC uint calcsize_items(const char *fmt) {
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// TODO
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return strlen(fmt);
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}
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STATIC mp_obj_t struct_calcsize(mp_obj_t fmt_in) {
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const char *fmt = mp_obj_str_get_str(fmt_in);
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char fmt_type = get_fmt_type(&fmt);
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machine_uint_t size;
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for (size = 0; *fmt; fmt++) {
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uint align;
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int sz = mp_binary_get_size(fmt_type, *fmt, &align);
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// TODO
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assert(sz != -1);
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// Apply alignment
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size = (size + align - 1) & ~(align - 1);
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size += sz;
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}
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return MP_OBJ_NEW_SMALL_INT(size);
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}
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MP_DEFINE_CONST_FUN_OBJ_1(struct_calcsize_obj, struct_calcsize);
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STATIC mp_obj_t struct_unpack(mp_obj_t fmt_in, mp_obj_t data_in) {
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// TODO: "The buffer must contain exactly the amount of data required by the format (len(bytes) must equal calcsize(fmt))."
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const char *fmt = mp_obj_str_get_str(fmt_in);
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char fmt_type = get_fmt_type(&fmt);
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uint size = calcsize_items(fmt);
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mp_obj_tuple_t *res = mp_obj_new_tuple(size, NULL);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(data_in, &bufinfo, MP_BUFFER_READ);
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byte *p = bufinfo.buf;
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for (uint i = 0; i < size; i++) {
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mp_obj_t item = mp_binary_get_val(fmt_type, *fmt++, &p);
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res->items[i] = item;
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}
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return res;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(struct_unpack_obj, struct_unpack);
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STATIC mp_obj_t struct_pack(uint n_args, mp_obj_t *args) {
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// TODO: "The arguments must match the values required by the format exactly."
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const char *fmt = mp_obj_str_get_str(args[0]);
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char fmt_type = get_fmt_type(&fmt);
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int size = MP_OBJ_SMALL_INT_VALUE(struct_calcsize(args[0]));
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byte *p;
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mp_obj_t res = mp_obj_str_builder_start(&mp_type_bytes, size, &p);
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memset(p, 0, size);
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for (uint i = 1; i < n_args; i++) {
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mp_binary_set_val(fmt_type, *fmt++, args[i], &p);
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}
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return res;
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(struct_pack_obj, 1, -1, struct_pack);
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STATIC const mp_map_elem_t mp_module_struct_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_struct) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_calcsize), (mp_obj_t)&struct_calcsize_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_pack), (mp_obj_t)&struct_pack_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_unpack), (mp_obj_t)&struct_unpack_obj },
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};
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STATIC const mp_obj_dict_t mp_module_struct_globals = {
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.base = {&mp_type_dict},
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.map = {
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.all_keys_are_qstrs = 1,
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.table_is_fixed_array = 1,
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.used = ARRAY_SIZE(mp_module_struct_globals_table),
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.alloc = ARRAY_SIZE(mp_module_struct_globals_table),
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.table = (mp_map_elem_t*)mp_module_struct_globals_table,
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},
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};
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const mp_obj_module_t mp_module_struct = {
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.base = { &mp_type_module },
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.name = MP_QSTR_struct,
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.globals = (mp_obj_dict_t*)&mp_module_struct_globals,
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};
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#endif
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