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#include <EEPROM.h>
#include <strings.h>
#include "config.h"
#include "logging.h"
#define GET_DATA_CRC(data) \
eeprom_crc(reinterpret_cast<uint8_t*>(&(data))+4, sizeof(ConfigData)-4)
namespace homekit::config {
static const uint32_t magic = 0xdeadbeef;
static const uint32_t crc_table[16] PROGMEM = {
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};
static uint32_t eeprom_crc(const uint8_t* data, size_t len) {
uint32_t crc = ~0L;
for (size_t index = 0; index < len; index++) {
crc = pgm_read_word(&crc_table[(crc ^ data[index]) & 0x0f]) ^ (crc >> 4);
crc = pgm_read_word(&crc_table[(crc ^ (data[index] >> 4)) & 0x0f]) ^ (crc >> 4);
crc = ~crc;
}
return crc;
}
ConfigData read() {
ConfigData data;
EEPROM.begin(sizeof(ConfigData));
EEPROM.get(0, data);
EEPROM.end();
#ifdef DEBUG
if (!isValid(data)) {
PRINTLN("config::read(): data is not valid!");
}
#endif
return data;
}
void write(ConfigData& data) {
EEPROM.begin(sizeof(ConfigData));
data.magic = magic;
data.crc = GET_DATA_CRC(data);
EEPROM.put(0, data);
EEPROM.end();
}
void erase() {
ConfigData data;
erase(data);
}
void erase(ConfigData& data) {
bzero(reinterpret_cast<uint8_t*>(&data), sizeof(data));
write(data);
}
bool isValid(ConfigData& data) {
return data.crc == GET_DATA_CRC(data);
}
bool isDirty(ConfigData& data) {
return data.magic != magic;
}
char* ConfigData::escapeHomeId(char* buf, size_t len) {
if (len < 32)
return nullptr;
size_t id_len = strlen(home_id);
char* c = home_id;
char* dst = buf;
for (size_t i = 0; i < id_len; i++) {
if (*c == '"')
*(dst++) = '\\';
*(dst++) = *c;
c++;
}
*dst = '\0';
return buf;
}
}
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