dttr_sigscan.h

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#ifndef DTTR_SIGSCAN_H
#define DTTR_SIGSCAN_H
 
#include <stddef.h>
#include <stdint.h>
#include <string.h>
 
// Scans bytes with 'x' mask entries as exact matches and all other entries as wildcards.
static inline const uint8_t *DTTR_Sigscan_Bytes(
    const uint8_t *base,
    size_t size,
    const void *sig,
    const char *mask
) {
    if (!base || !sig || !mask) {
        return NULL;
    }
 
    const uint8_t *sig_bytes = sig;
    const size_t mask_len = strlen(mask);
    if (mask_len == 0 || mask_len > size) {
        return NULL;
    }
 
    for (size_t i = 0; i <= size - mask_len; i++) {
        size_t j = 0;
        for (; j < mask_len; j++) {
            if (mask[j] != 'x') {
                continue;
            }
 
            if (base[i + j] != sig_bytes[j]) {
                break;
            }
        }
 
        if (j == mask_len) {
            return base + i;
        }
    }
 
    return NULL;
}
 
#endif // DTTR_SIGSCAN_H