hex.h

// by petter wahlman, www.twitter.com/badeip
#ifndef HEX_H
#define HEX_H
#include <ctype.h>

void print_hex(void *data, size_t len, unsigned int flag);
//---[ flags: ]----------------------------------------------------------------
// hex output flags:
#define HEX_SKIP_ASCII   1
#define HEX_SKIP_WS      2
#define HEX_SKIP_TAB     4
#define HEX_SKIP_NL      8
#define HEX_SKIP_OFFSET 16
#define HEX_SKIP_HEX    32



//---[ macros: ]----------------------------------------------------------------
#define TOI(a) (a[0]<<24|a[1]<<16|a[2]<<8|a[3])
#define TOA(w) { \
    char *c = (char *)&w; \
    if (isprint(c[0]) && isprint(c[1]) && isprint(c[2]) && isprint(c[3])) \
        printf("%c%c%c%c\n", c[3], c[2], c[1], c[0]); \
}
#define TOX(s, bufsize, buf) \
{ \
    int i; \
    int slen = strlen(s); \
    for (i = 0; (i < slen) && (i < (bufsize << 1)); i++) { \
        s[i] |= 0x20; \
        if (s[i] >= '0' && (s[i] <= '9')) \
            s[i] -= '0'; \
        else \
            s[i] -= 87; \
        if (i % 2) \
            buf[i >> 1] |= s[i]; \
        else \
            buf[i >> 1] = s[i] << 4; \
    } \
}

#define print_hex(data, len, flag)                                      \
do {                                                                    \
    unsigned char *in = (unsigned char *)data;                          \
    int i, j;                                                           \
                                                                        \
    if (!(flag & HEX_SKIP_TAB))                                         \
        printf("\t");                                                   \
                                                                        \
    i = 0;                                                              \
    while (i < len) {                                                   \
        if (!(flag & HEX_SKIP_OFFSET))                                  \
            printf("%02x: ", i);                                        \
                                                                        \
        if (!(flag & HEX_SKIP_HEX)) {                                   \
            for (j = 0; j < 16 && i + j < len; j++) {                   \
                printf("%02x", in[i + j]);                              \
                if (!(flag & HEX_SKIP_WS))                              \
                    printf(" ");                                        \
            }                                                           \
                                                                        \
            while (j++ < 16)                                            \
                printf("   ");                                          \
        }                                                               \
                                                                        \
        if (!(flag & HEX_SKIP_ASCII)) {                                 \
            if (!(flag & HEX_SKIP_HEX))                                 \
                printf("| ");                                           \
            for (j = 0; j < 16 && i + j < len; j++)                     \
                printf("%c", isprint(in[i + j]) ? in[i + j] : '.');     \
        }                                                               \
        i += 16;                                                        \
        if (!(flag & HEX_SKIP_NL))                                      \
            printf("\n");                                               \
                                                                        \
        if (!(flag & HEX_SKIP_TAB))                                     \
            printf("\t");                                               \
    }                                                                   \
                                                                        \
    printf("\n");                                                       \
} while(0)

#endif