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[core] Add fnv1_hash_extend() string overloads, use in atm90e32 (#13326)

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This commit is contained in:
J. Nick Koston
2026-01-17 15:52:19 -10:00
committed by GitHub
parent d6a0c8ffbb
commit 01cdc4ed58
2 changed files with 28 additions and 3 deletions
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9
esphome/components/atm90e32/atm90e32.cpp
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@@ -158,12 +158,14 @@ void ATM90E32Component::setup() {
if (this->enable_offset_calibration_) {
// Initialize flash storage for offset calibrations
uint32_t o_hash = fnv1_hash(std::string("_offset_calibration_") + this->cs_summary_);
uint32_t o_hash = fnv1_hash("_offset_calibration_");
o_hash = fnv1_hash_extend(o_hash, this->cs_summary_);
this->offset_pref_ = global_preferences->make_preference<OffsetCalibration[3]>(o_hash, true);
this->restore_offset_calibrations_();
// Initialize flash storage for power offset calibrations
uint32_t po_hash = fnv1_hash(std::string("_power_offset_calibration_") + this->cs_summary_);
uint32_t po_hash = fnv1_hash("_power_offset_calibration_");
po_hash = fnv1_hash_extend(po_hash, this->cs_summary_);
this->power_offset_pref_ = global_preferences->make_preference<PowerOffsetCalibration[3]>(po_hash, true);
this->restore_power_offset_calibrations_();
} else {
@@ -183,7 +185,8 @@ void ATM90E32Component::setup() {
if (this->enable_gain_calibration_) {
// Initialize flash storage for gain calibration
uint32_t g_hash = fnv1_hash(std::string("_gain_calibration_") + this->cs_summary_);
uint32_t g_hash = fnv1_hash("_gain_calibration_");
g_hash = fnv1_hash_extend(g_hash, this->cs_summary_);
this->gain_calibration_pref_ = global_preferences->make_preference<GainCalibration[3]>(g_hash, true);
this->restore_gain_calibrations_();

22
esphome/core/helpers.h
View File

@@ -395,6 +395,28 @@ constexpr uint32_t FNV1_OFFSET_BASIS = 2166136261UL;
/// FNV-1 32-bit prime
constexpr uint32_t FNV1_PRIME = 16777619UL;
/// Extend a FNV-1 hash with an integer (hashes each byte).
template<std::integral T> constexpr uint32_t fnv1_hash_extend(uint32_t hash, T value) {
using UnsignedT = std::make_unsigned_t<T>;
UnsignedT uvalue = static_cast<UnsignedT>(value);
for (size_t i = 0; i < sizeof(T); i++) {
hash *= FNV1_PRIME;
hash ^= (uvalue >> (i * 8)) & 0xFF;
}
return hash;
}
/// Extend a FNV-1 hash with additional string data.
constexpr uint32_t fnv1_hash_extend(uint32_t hash, const char *str) {
if (str) {
while (*str) {
hash *= FNV1_PRIME;
hash ^= *str++;
}
}
return hash;
}
inline uint32_t fnv1_hash_extend(uint32_t hash, const std::string &str) { return fnv1_hash_extend(hash, str.c_str()); }
/// Extend a FNV-1a hash with additional string data.
constexpr uint32_t fnv1a_hash_extend(uint32_t hash, const char *str) {
if (str) {