100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
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* This file is part of the micropython-ulab project,
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*
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* https://github.com/v923z/micropython-ulab
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2020-2021 Zoltán Vörös
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "py/misc.h"
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#include "utils.h"
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#if ULAB_HAS_UTILS_MODULE
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#if ULAB_HAS_UTILS_HAS_FROM_INTBUFFER
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static mp_obj_t utils_from_intbuffer(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_, MP_ARG_REQUIRED | MP_ARG_OBJ, { .u_rom_obj = mp_const_none } } ,
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{ MP_QSTR_count, MP_ARG_KW_ONLY | MP_ARG_OBJ, { .u_rom_obj = MP_ROM_INT(-1) } },
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{ MP_QSTR_offset, MP_ARG_KW_ONLY | MP_ARG_OBJ, { .u_rom_obj = MP_ROM_INT(0) } },
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{ MP_QSTR_inplace, MP_ARG_OBJ, { .u_rom_obj = mp_const_false } },
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{ MP_QSTR_byteswap, MP_ARG_OBJ, { .u_rom_obj = mp_const_false } },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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if(args[3].u_obj == mp_const_true) {
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mp_raise_NotImplementedError(translate("inplace conversion is not implemented"));
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}
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size_t offset = mp_obj_get_int(args[2].u_obj);
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mp_buffer_info_t bufinfo;
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if(mp_get_buffer(args[0].u_obj, &bufinfo, MP_BUFFER_READ)) {
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if(bufinfo.len < offset) {
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mp_raise_ValueError(translate("offset is too large"));
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}
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size_t len = (bufinfo.len - offset) / sizeof(int32_t);
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if((len * sizeof(int32_t)) != (bufinfo.len - offset)) {
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mp_raise_ValueError(translate("buffer size must be a multiple of element size"));
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}
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if(mp_obj_get_int(args[1].u_obj) > 0) {
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size_t count = mp_obj_get_int(args[1].u_obj);
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if(len < count) {
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mp_raise_ValueError(translate("buffer is smaller than requested size"));
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} else {
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len = count;
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}
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}
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ndarray_obj_t *ndarray = ndarray_new_linear_array(len, NDARRAY_FLOAT);
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uint8_t *buffer = bufinfo.buf;
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mp_float_t *array = (mp_float_t *)ndarray->array;
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if(args[4].u_obj == mp_const_true) {
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// swap the bytes before conversion
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uint8_t *tmpbuff = m_new(uint8_t, 4);
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for(size_t i = 0; i < len; i++) {
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tmpbuff += sizeof(int32_t);
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for(uint8_t j = 0; j < sizeof(int32_t); j++) {
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memcpy(tmpbuff--, buffer++, 1);
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}
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*array++ = (mp_float_t)(*(int32_t *)tmpbuff);
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buffer += sizeof(int32_t);
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}
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} else {
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for(uint8_t i = 0; i < len; i++) {
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*array++ = (mp_float_t)(*(int32_t *)buffer);
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buffer += sizeof(int32_t);
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}
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}
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return MP_OBJ_FROM_PTR(ndarray);
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(utils_from_intbuffer_obj, 1, utils_from_intbuffer);
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#endif
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static const mp_rom_map_elem_t ulab_utils_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_utils) },
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#if ULAB_HAS_UTILS_HAS_FROM_INTBUFFER
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{ MP_OBJ_NEW_QSTR(MP_QSTR_from_intbuffer), (mp_obj_t)&utils_from_intbuffer_obj },
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#endif
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};
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static MP_DEFINE_CONST_DICT(mp_module_ulab_utils_globals, ulab_utils_globals_table);
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mp_obj_module_t ulab_utils_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mp_module_ulab_utils_globals,
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};
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#endif
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