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[esp8266] Replace std::vector with std::unique_ptr in preferences to save flash (#10245)

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This commit is contained in:
J. Nick Koston
2025-08-18 09:01:39 -04:00
committed by GitHub
parent c29f8d0187
commit 0a77423073
1 changed files with 19 additions and 22 deletions
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41
esphome/components/esp8266/preferences.cpp
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@@ -12,7 +12,7 @@ extern "C" {
#include "preferences.h"
#include <cstring>
#include <vector>
#include <memory>
namespace esphome {
namespace esp8266 {
@@ -67,6 +67,8 @@ static uint32_t get_esp8266_flash_sector() {
}
static uint32_t get_esp8266_flash_address() { return get_esp8266_flash_sector() * SPI_FLASH_SEC_SIZE; }
static inline size_t bytes_to_words(size_t bytes) { return (bytes + 3) / 4; }
template<class It> uint32_t calculate_crc(It first, It last, uint32_t type) {
uint32_t crc = type;
while (first != last) {
@@ -123,41 +125,36 @@ class ESP8266PreferenceBackend : public ESPPreferenceBackend {
size_t length_words = 0;
bool save(const uint8_t *data, size_t len) override {
if ((len + 3) / 4 != length_words) {
if (bytes_to_words(len) != length_words) {
return false;
}
std::vector<uint32_t> buffer;
buffer.resize(length_words + 1);
memcpy(buffer.data(), data, len);
buffer[buffer.size() - 1] = calculate_crc(buffer.begin(), buffer.end() - 1, type);
size_t buffer_size = length_words + 1;
std::unique_ptr<uint32_t[]> buffer(new uint32_t[buffer_size]()); // Note the () for zero-initialization
memcpy(buffer.get(), data, len);
buffer[length_words] = calculate_crc(buffer.get(), buffer.get() + length_words, type);
if (in_flash) {
return save_to_flash(offset, buffer.data(), buffer.size());
} else {
return save_to_rtc(offset, buffer.data(), buffer.size());
return save_to_flash(offset, buffer.get(), buffer_size);
}
return save_to_rtc(offset, buffer.get(), buffer_size);
}
bool load(uint8_t *data, size_t len) override {
if ((len + 3) / 4 != length_words) {
if (bytes_to_words(len) != length_words) {
return false;
}
std::vector<uint32_t> buffer;
buffer.resize(length_words + 1);
bool ret;
if (in_flash) {
ret = load_from_flash(offset, buffer.data(), buffer.size());
} else {
ret = load_from_rtc(offset, buffer.data(), buffer.size());
}
size_t buffer_size = length_words + 1;
std::unique_ptr<uint32_t[]> buffer(new uint32_t[buffer_size]());
bool ret = in_flash ? load_from_flash(offset, buffer.get(), buffer_size)
: load_from_rtc(offset, buffer.get(), buffer_size);
if (!ret)
return false;
uint32_t crc = calculate_crc(buffer.begin(), buffer.end() - 1, type);
if (buffer[buffer.size() - 1] != crc) {
uint32_t crc = calculate_crc(buffer.get(), buffer.get() + length_words, type);
if (buffer[length_words] != crc) {
return false;
}
memcpy(data, buffer.data(), len);
memcpy(data, buffer.get(), len);
return true;
}
};
@@ -178,7 +175,7 @@ class ESP8266Preferences : public ESPPreferences {
}
ESPPreferenceObject make_preference(size_t length, uint32_t type, bool in_flash) override {
uint32_t length_words = (length + 3) / 4;
uint32_t length_words = bytes_to_words(length);
if (in_flash) {
uint32_t start = current_flash_offset;
uint32_t end = start + length_words + 1;