// normal linux
static void hexdump(uint8_t *_data, size_t size) {
    uint8_t *data = (uint8_t *)_data;
    size_t offset = 0;
    size_t i = 0;
    while (offset < size) {
        printf("0x%04x  ", offset);

        size_t n = size - offset;
        if (n > 16) {
            n = 16;
        }

        for (i = 0; i < 16; ++i) {
            if (i == 8) {
                printf(" ");
            }

            if (offset + i < size) {
                printf("%02x ", data[offset + i]);
            } else {
                printf("   ");
            }
        }

        printf(" ");

        for (i = 0; i < n; ++i) {
            if (isprint(data[offset + i])) {
                printf("%c", data[offset + i]);
            } else {
                printf(".");
            }
        }

        printf("\n");

        offset += 16;
    }
}

Android의 경우는 printf대신 ALOGI 혹은 ALOGV, ALOGE등을 사용하시면 됩니다.