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#include <sstream>
#include <string>
#include "misc.h"
#include "inttypes.h"
namespace nitrokey {
namespace misc {
std::string hexdump(const char *p, size_t size, bool print_header) {
std::stringstream out;
char formatbuf[128];
const char *pstart = p;
for (const char *pend = p + size; p < pend;) {
if (print_header){
snprintf(formatbuf, 128, "%04lx\t", p - pstart);
out << formatbuf;
}
for (const char *le = p + 16; p < le && p < pend; p++) {
snprintf(formatbuf, 128, "%02x ", uint8_t(*p));
out << formatbuf;
}
out << std::endl;
}
return out.str();
}
static uint32_t _crc32(uint32_t crc, uint32_t data) {
int i;
crc = crc ^ data;
for (i = 0; i < 32; i++) {
if (crc & 0x80000000)
crc = (crc << 1) ^ 0x04C11DB7; // polynomial used in STM32
else
crc = (crc << 1);
}
return crc;
}
uint32_t stm_crc32(const uint8_t *data, size_t size) {
uint32_t crc = 0xffffffff;
const uint32_t *pend = (const uint32_t *)(data + size);
for (const uint32_t *p = (const uint32_t *)(data); p < pend; p++)
crc = _crc32(crc, *p);
return crc;
}
}
}
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