bin2hex.c

#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);
}

hex2bin.c

#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);

}