88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
#include <assert.h>
|
|
#include <limits.h>
|
|
#include <unistd.h>
|
|
|
|
#include "hex.h"
|
|
|
|
static uint8_t hex_table[256];
|
|
static uint8_t hex_upper_table[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', };
|
|
static uint8_t hex_lower_table[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', };
|
|
|
|
#define HEX_INVALID 0xff
|
|
|
|
void hex_init() {
|
|
for (size_t i = 0; i < sizeof(hex_table) / sizeof(*hex_table); i++) {
|
|
hex_table[i] = HEX_INVALID;
|
|
}
|
|
for (uint8_t i = '0'; i <= '9'; i++) {
|
|
hex_table[i] = i - '0';
|
|
}
|
|
for (uint8_t i = 'a'; i <= 'f'; i++) {
|
|
hex_table[i] = 10 + i - 'a';
|
|
}
|
|
for (uint8_t i = 'A'; i <= 'F'; i++) {
|
|
hex_table[i] = 10 + i - 'A';
|
|
}
|
|
}
|
|
|
|
bool hex_to_bin(uint8_t *out, const uint8_t *in, size_t bytes) {
|
|
for (size_t i = 0, j = 0; i < bytes; i++, j += 2) {
|
|
uint8_t val1 = hex_table[in[j]], val2 = hex_table[in[j + 1]];
|
|
if (val1 == HEX_INVALID || val2 == HEX_INVALID) {
|
|
return false;
|
|
}
|
|
out[i] = (uint8_t) (val1 << 4) | val2;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
int64_t hex_to_int(const uint8_t *in, size_t bytes) {
|
|
const uint8_t *in2 = (const uint8_t *) in;
|
|
uint64_t ret = 0;
|
|
bytes *= 2;
|
|
for (size_t i = 0; i < bytes; i++) {
|
|
ret <<= 4;
|
|
uint8_t val = hex_table[in2[i]];
|
|
if (val == 0xff) {
|
|
return -1;
|
|
}
|
|
ret |= val;
|
|
}
|
|
if (ret > INT64_MAX) {
|
|
return -1;
|
|
}
|
|
return (int64_t) ret;
|
|
}
|
|
|
|
static void hex_from_bin(uint8_t *out, const uint8_t *in, size_t bytes, uint8_t table[]) {
|
|
for (size_t i = 0, j = 0; i < bytes; i++, j += 2) {
|
|
out[j] = table[in[i] >> 4];
|
|
out[j + 1] = table[in[i] & 0xf];
|
|
}
|
|
}
|
|
|
|
static void hex_from_int(uint8_t *out, uint64_t in, size_t bytes, uint8_t table[]) {
|
|
bytes *= 2;
|
|
assert(bytes < SSIZE_MAX);
|
|
for (ssize_t o = (ssize_t) bytes - 1; o >= 0; o--) {
|
|
out[o] = table[in & 0xf];
|
|
in >>= 4;
|
|
}
|
|
}
|
|
|
|
void hex_from_bin_upper(uint8_t *out, const uint8_t *in, size_t bytes) {
|
|
hex_from_bin(out, in, bytes, hex_upper_table);
|
|
}
|
|
|
|
void hex_from_bin_lower(uint8_t *out, const uint8_t *in, size_t bytes) {
|
|
hex_from_bin(out, in, bytes, hex_lower_table);
|
|
}
|
|
|
|
void hex_from_int_upper(uint8_t *out, uint64_t in, size_t bytes) {
|
|
hex_from_int(out, in, bytes, hex_upper_table);
|
|
}
|
|
|
|
void hex_from_int_lower(uint8_t *out, uint64_t in, size_t bytes) {
|
|
hex_from_int(out, in, bytes, hex_lower_table);
|
|
}
|