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@ircmaxell ircmaxell/bin2hex.c
Last active Jul 29, 2017

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#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/resource.h>
double get_time()
{
struct timeval t;
struct timezone tzp;
gettimeofday(&t, &tzp);
return t.tv_sec + t.tv_usec * 1e-6;
}
static char hexconvtab[] = "0123456789abcdef";
static char* ts_bin2hex(const unsigned char *old, const size_t oldlen)
{
char *result = (char*) malloc(oldlen * 2 + 1);
size_t i, j;
int b = 0;
for (i = j = 0; i < oldlen; i++) {
b = old[i] >> 4;
result[j++] = (char) (87 + b + (((b - 10) >> 31) & -39));
b = old[i] & 0xf;
result[j++] = (char) (87 + b + (((b - 10) >> 31) & -39));
}
result[j] = '\0';
return result;
}
static char* php_bin2hex(const unsigned char *old, const size_t oldlen)
{
char *result = (char*) malloc(oldlen * 2 + 1);
size_t i, j;
for (i = j = 0; i < oldlen; i++) {
result[j++] = hexconvtab[old[i] >> 4];
result[j++] = hexconvtab[old[i] & 15];
}
result[j] = '\0';
return result;
}
main()
{
char *t, *s = "this is a test";
size_t len = sizeof("this is a test");
int i;
double start, end;
start = get_time();
for (i = 0; i < 1000000; i++) {
t = php_bin2hex(s, len);
free(t);
}
end = get_time();
printf("PHP bin2hex In %f Seconds\r\n", end - start);
start = get_time();
for (i = 0; i < 1000000; i++) {
t = ts_bin2hex(s, len);
free(t);
}
end = get_time();
printf("TS bin2hex In %f Seconds\r\n", end - start);
}
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/resource.h>
double get_time()
{
struct timeval t;
struct timezone tzp;
gettimeofday(&t, &tzp);
return t.tv_sec + t.tv_usec * 1e-6;
}
static char *php_hex2bin(const unsigned char *old, const size_t oldlen)
{
size_t target_length = oldlen >> 1;
char *str = (char *) malloc(target_length);
unsigned char *ret = str;
size_t i, j;
for (i = j = 0; i < target_length; i++) {
unsigned char c = old[j++];
unsigned char d;
if (c >= '0' && c <= '9') {
d = (c - '0') << 4;
} else if (c >= 'a' && c <= 'f') {
d = (c - 'a' + 10) << 4;
} else if (c >= 'A' && c <= 'F') {
d = (c - 'A' + 10) << 4;
} else {
free(str);
return NULL;
}
c = old[j++];
if (c >= '0' && c <= '9') {
d |= c - '0';
} else if (c >= 'a' && c <= 'f') {
d |= c - 'a' + 10;
} else if (c >= 'A' && c <= 'F') {
d |= c - 'A' + 10;
} else {
free(str);
return NULL;
}
ret[i] = d;
}
ret[i] = '\0';
return str;
}
static char *ts_hex2bin(const unsigned char *old, const size_t oldlen) {
size_t target_length = oldlen >> 1;
char *str = (char *) malloc(target_length);
size_t i;
for (i = 0; i < target_length; i++) {
int temp = -1;
int t2 = 0;
int ch = (unsigned char) old[2 * i];
// if (ch > 0x2f && ch < 0x3a) ret += ch - 0x30 + 1; // -47
temp += (((0x2f - ch) & (ch - 0x3a)) >> 8) & (ch - 47);
ch |= 0x20;
// if (ch > 0x60 && ch < 0x67) ret += ch - 0x61 + 10 + 1; // -86
temp += (((0x60 - ch) & (ch - 0x67)) >> 8) & (ch - 86);
t2 = temp << 4;
temp = -1;
ch = (unsigned char) old[2 * i + 1];
// if (ch > 0x2f && ch < 0x3a) ret += ch - 0x30 + 1; // -47
temp += (((0x2f - ch) & (ch - 0x3a)) >> 8) & (ch - 47);
ch |= 0x20;
// if (ch > 0x60 && ch < 0x67) ret += ch - 0x61 + 10 + 1; // -86
temp += (((0x60 - ch) & (ch - 0x67)) >> 8) & (ch - 86);
t2 |= temp;
if (0 != (t2 >> 8)) {
free(str);
return NULL;
}
str[i] = (char) t2 & 0xFF;
}
str[i] = '\0';
return str;
}
main()
{
char *t, *s = "fFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfF";
size_t len = sizeof("fFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfFfF");
int i;
double start, end;
start = get_time();
for (i = 0; i < 1000000; i++) {
t = php_hex2bin(s, len);
free(t);
}
end = get_time();
printf("PHP hex2bin In %f Seconds\r\n", end - start);
start = get_time();
for (i = 0; i < 1000000; i++) {
t = ts_hex2bin(s, len);
free(t);
}
end = get_time();
printf("TS hex2bin In %f Seconds\r\n", end - start);
}
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