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nvs::Item class
Syntax
class Item
{
public:
union {
struct {
uint8_t nsIndex;
ItemType datatype;
uint8_t span;
uint8_t chunkIndex;
uint32_t crc32;
char key[NVS_KEY_NAME_MAX_SIZE];
union {
struct {
uint16_t dataSize;
uint16_t reserved;
uint32_t dataCrc32;
} varLength;
struct {
uint32_t dataSize;
uint8_t chunkCount;
VerOffset chunkStart;
uint16_t reserved;
} blobIndex;
uint8_t data[8];
};
};
uint8_t rawData[32];
};
static const size_t MAX_KEY_LENGTH = sizeof(key) - 1;
static const uint8_t CHUNK_ANY = 0xff;
Item(uint8_t nsIndex, ItemType datatype, uint8_t span, const char* key_, uint8_t chunkIdx = CHUNK_ANY)
: nsIndex(nsIndex), datatype(datatype), span(span), chunkIndex(chunkIdx)
{
std::fill_n(reinterpret_cast<uint32_t*>(key), sizeof(key) / 4, 0xffffffff);
std::fill_n(reinterpret_cast<uint32_t*>(data), sizeof(data) / 4, 0xffffffff);
if (key_) {
strncpy(key, key_, sizeof(key) - 1);
key[sizeof(key) - 1] = 0;
} else {
key[0] = 0;
}
}
Item()
{
}
uint32_t calculateCrc32() const;
uint32_t calculateCrc32WithoutValue() const;
static uint32_t calculateCrc32(const uint8_t* data, size_t size);
void getKey(char* dst, size_t dstSize)
{
strncpy(dst, key, min(dstSize, sizeof(key)));
dst[dstSize-1] = 0;
}
template<typename T>
esp_err_t getValue(T& dst)
{
NVS_ASSERT_OR_RETURN(itemTypeOf(dst) == datatype, ESP_FAIL);
dst = *reinterpret_cast<T*>(data);
return ESP_OK;
}
bool checkHeaderConsistency(const uint8_t entryIndex) const;
};
Fields
Related Functions
Found 8 other functions taking a Item
argument:
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