/**
 * GDBM wrapper functions for Vala bindings.
 * 
 * These wrapper functions handle the datum struct conversion between
 * C and Vala types.
 */

#include "gdbm_wrapper.h"
#include <string.h>

int gdbm_exists_wrapper(GDBM_FILE dbf, const char *key) {
    datum key_datum;
    key_datum.dptr = (char *)key;
    key_datum.dsize = strlen(key);
    return gdbm_exists(dbf, key_datum);
}

GBytes* gdbm_fetch_wrapper(GDBM_FILE dbf, const char *key) {
    datum key_datum;
    key_datum.dptr = (char *)key;
    key_datum.dsize = strlen(key);
    
    datum result = gdbm_fetch(dbf, key_datum);
    if (result.dptr == NULL) {
        return NULL;
    }
    
    GBytes *bytes = g_bytes_new(result.dptr, result.dsize);
    free(result.dptr);  /* GDBM allocates memory that we need to free */
    
    return bytes;
}

int gdbm_store_wrapper(GDBM_FILE dbf, const char *key, GBytes *content, int flag) {
    datum key_datum;
    key_datum.dptr = (char *)key;
    key_datum.dsize = strlen(key);
    
    gsize content_size;
    gconstpointer content_data = g_bytes_get_data(content, &content_size);
    
    datum content_datum;
    content_datum.dptr = (char *)content_data;
    content_datum.dsize = content_size;
    
    return gdbm_store(dbf, key_datum, content_datum, flag);
}

int gdbm_delete_wrapper(GDBM_FILE dbf, const char *key) {
    datum key_datum;
    key_datum.dptr = (char *)key;
    key_datum.dsize = strlen(key);
    
    return gdbm_delete(dbf, key_datum);
}

char* gdbm_firstkey_wrapper(GDBM_FILE dbf) {
    datum key = gdbm_firstkey(dbf);
    if (key.dptr == NULL) {
        return NULL;
    }
    
    char *result = g_strndup(key.dptr, key.dsize);
    free(key.dptr);  /* GDBM allocates memory that we need to free */
    
    return result;
}

char* gdbm_nextkey_wrapper(GDBM_FILE dbf, const char *prev_key) {
    datum prev_datum;
    prev_datum.dptr = (char *)prev_key;
    prev_datum.dsize = strlen(prev_key);
    
    datum key = gdbm_nextkey(dbf, prev_datum);
    if (key.dptr == NULL) {
        return NULL;
    }
    
    char *result = g_strndup(key.dptr, key.dsize);
    free(key.dptr);  /* GDBM allocates memory that we need to free */
    
    return result;
}