221 lines
6.5 KiB
C
221 lines
6.5 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) 2016 Paul Sokolovsky
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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* Copyright (c) 2017 Michael McWethy
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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 "py/runtime.h"
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#include "py/binary.h"
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#include "py/parsenum.h"
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#include "supervisor/shared/translate/translate.h"
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#include "shared-bindings/struct/__init__.h"
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STATIC void struct_validate_format(char fmt) {
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#if MICROPY_NONSTANDARD_TYPECODES
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if (fmt == 'S' || fmt == 'O') {
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mp_raise_RuntimeError(translate("'S' and 'O' are not supported format types"));
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}
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#endif
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}
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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 mp_uint_t get_fmt_num(const char **p) {
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const char *num = *p;
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uint len = 1;
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while (unichar_isdigit(*++num)) {
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len++;
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}
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mp_uint_t val = (mp_uint_t)MP_OBJ_SMALL_INT_VALUE(mp_parse_num_integer(*p, len, 10, NULL));
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*p = num;
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return val;
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}
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STATIC mp_uint_t calcsize_items(const char *fmt) {
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mp_uint_t cnt = 0;
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while (*fmt) {
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int num = 1;
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if (unichar_isdigit(*fmt)) {
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num = get_fmt_num(&fmt);
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if (*fmt == 's') {
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num = 1;
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}
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}
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// Pad bytes are skipped and don't get included in the item count.
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if (*fmt != 'x') {
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cnt += num;
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}
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fmt++;
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}
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return cnt;
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}
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mp_uint_t shared_modules_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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mp_uint_t size;
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for (size = 0; *fmt; fmt++) {
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struct_validate_format(*fmt);
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mp_uint_t cnt = 1;
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if (unichar_isdigit(*fmt)) {
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cnt = get_fmt_num(&fmt);
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}
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if (*fmt == 's') {
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size += cnt;
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} else {
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mp_uint_t align;
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size_t sz = mp_binary_get_size(fmt_type, *fmt, &align);
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while (cnt--) {
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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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}
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}
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return size;
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}
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void shared_modules_struct_pack_into(mp_obj_t fmt_in, byte *p, byte *end_p, size_t n_args, const mp_obj_t *args) {
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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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const mp_uint_t total_sz = shared_modules_struct_calcsize(fmt_in);
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if (p + total_sz > end_p) {
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mp_raise_RuntimeError(translate("Buffer too small"));
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}
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size_t i = 0;
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byte *p_base = p;
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while (*fmt) {
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mp_uint_t sz = 1;
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struct_validate_format(*fmt);
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if (unichar_isdigit(*fmt)) {
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sz = get_fmt_num(&fmt);
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}
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if (*fmt == 's') {
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if (i < n_args) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[i], &bufinfo, MP_BUFFER_READ);
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mp_uint_t to_copy = sz;
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if (bufinfo.len < to_copy) {
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to_copy = bufinfo.len;
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}
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memcpy(p, bufinfo.buf, to_copy);
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memset(p + to_copy, 0, sz - to_copy);
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}
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i++;
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p += sz;
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} else {
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while (sz--) {
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// Pad bytes don't have a corresponding argument.
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if (*fmt == 'x') {
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mp_binary_set_val(fmt_type, *fmt, MP_OBJ_NEW_SMALL_INT(0), p_base, &p);
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} else {
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if (i < n_args) {
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mp_binary_set_val(fmt_type, *fmt, args[i], p_base, &p);
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}
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i++;
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}
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}
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}
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fmt++;
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}
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(void)mp_arg_validate_length(n_args, i, MP_QSTR_values);
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}
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mp_obj_tuple_t *shared_modules_struct_unpack_from(mp_obj_t fmt_in, byte *p, byte *end_p, bool exact_size) {
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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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const mp_uint_t num_items = calcsize_items(fmt);
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const mp_uint_t total_sz = shared_modules_struct_calcsize(fmt_in);
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mp_obj_tuple_t *res = MP_OBJ_TO_PTR(mp_obj_new_tuple(num_items, NULL));
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// If exact_size, make sure the buffer is exactly the right size.
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// Otherwise just make sure it's big enough.
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if (exact_size) {
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if (p + total_sz != end_p) {
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mp_raise_RuntimeError(translate("buffer size must match format"));
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}
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} else {
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if (p + total_sz > end_p) {
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mp_raise_RuntimeError(translate("buffer too small"));
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}
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}
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byte *p_base = p;
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for (uint i = 0; i < num_items;) {
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mp_uint_t sz = 1;
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struct_validate_format(*fmt);
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if (unichar_isdigit(*fmt)) {
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sz = get_fmt_num(&fmt);
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}
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mp_obj_t item;
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if (*fmt == 's') {
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item = mp_obj_new_bytes(p, sz);
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p += sz;
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res->items[i++] = item;
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} else {
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while (sz--) {
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item = mp_binary_get_val(fmt_type, *fmt, p_base, &p);
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// Pad bytes are not stored.
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if (*fmt != 'x') {
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res->items[i++] = item;
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}
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}
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}
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fmt++;
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}
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return res;
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}
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