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[libretiny] Optimize preferences is_changed() by replacing temporary vector with unique_ptr (#10272)

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This commit is contained in:
J. Nick Koston
2025-08-19 21:48:04 -05:00
committed by GitHub
parent 56b6dd31f1
commit 2cbf4f30f9
1 changed files with 13 additions and 5 deletions
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18
esphome/components/libretiny/preferences.cpp
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@@ -5,7 +5,7 @@
#include "esphome/core/preferences.h"
#include <flashdb.h>
#include <cstring>
#include <vector>
#include <memory>
#include <string>
namespace esphome {
@@ -139,21 +139,29 @@ class LibreTinyPreferences : public ESPPreferences {
}
bool is_changed(const fdb_kvdb_t db, const NVSData &to_save) {
NVSData stored_data{};
struct fdb_kv kv;
fdb_kv_t kvp = fdb_kv_get_obj(db, to_save.key.c_str(), &kv);
if (kvp == nullptr) {
ESP_LOGV(TAG, "fdb_kv_get_obj('%s'): nullptr - the key might not be set yet", to_save.key.c_str());
return true;
}
stored_data.data.resize(kv.value_len);
fdb_blob_make(&blob, stored_data.data.data(), kv.value_len);
// Check size first - if different, data has changed
if (kv.value_len != to_save.data.size()) {
return true;
}
// Allocate buffer on heap to avoid stack allocation for large data
auto stored_data = std::make_unique<uint8_t[]>(kv.value_len);
fdb_blob_make(&blob, stored_data.get(), kv.value_len);
size_t actual_len = fdb_kv_get_blob(db, to_save.key.c_str(), &blob);
if (actual_len != kv.value_len) {
ESP_LOGV(TAG, "fdb_kv_get_blob('%s') len mismatch: %u != %u", to_save.key.c_str(), actual_len, kv.value_len);
return true;
}
return to_save.data != stored_data.data;
// Compare the actual data
return memcmp(to_save.data.data(), stored_data.get(), kv.value_len) != 0;
}
bool reset() override {