6663b6c9
 adorian
projet complet av...
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#include <ion.h>
constexpr uint32_t polynomial = 0x04C11DB7;
static uint32_t crc32(uint32_t crc, uint8_t data) {
crc ^= data << 24;
for (int i=8; i--;) {
crc = crc & 0x80000000 ? ((crc<<1)^polynomial) : (crc << 1);
}
return crc;
}
uint32_t Ion::crc32(const uint32_t * data, size_t length) {
uint32_t crc = 0xFFFFFFFF;
for (size_t i=0; i<length; i++) {
// FIXME: Assumes little-endian byte order!
crc = ::crc32(crc, (uint8_t)((data[i] >> 24) & 0xFF));
crc = ::crc32(crc, (uint8_t)((data[i] >> 16) & 0xFF));
crc = ::crc32(crc, (uint8_t)((data[i] >> 8) & 0xFF));
crc = ::crc32(crc, (uint8_t)(data[i] & 0xFF));
}
return crc;
}
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