int copiar_archivo(const char * src, const char * des, int ovw) {
	int fdsrc, fddes, bytes = -1;
	char buffer[1024*3]; int bufsize = sizeof(buffer);
 
	if (!fileexists(src) ) { return 0; }
	if ( fileexists(des) && !ovw ) { return 0; }
 
	fdsrc = sceIoOpen(src, PSP_O_RDONLY, 0777);
	if(fdsrc < 0) return 0;
	fddes = sceIoOpen(des, PSP_O_WRONLY | PSP_O_CREAT | PSP_O_TRUNC, 0777);
	if(fddes < 0) { sceIoClose(fdsrc); return 0; }
	bytes = sceIoRead(fdsrc, buffer, bufsize);
	while(bytes > 0) {
		sceIoWrite(fddes, buffer, bytes);
		bytes = sceIoRead(fdsrc, buffer, bufsize);
	}
	sceIoClose(fddes);
	sceIoClose(fdsrc);
	return 1;
}

int fileexists(const char* fpath) {
	SceUID temp = sceIoOpen(fpath, PSP_O_RDONLY, 0777); 
	if(temp>=0){ sceIoClose(temp); return 1; }
	return 0;
}

	int filedesc = sceIoDopen(src); 
	if (filedesc<0) { return 0; }
	SceIoDirent ent; memset(&ent, 0, sizeof(SceIoDirent));
 
	while (sceIoDread(filedesc,&ent)) {
          .... lo k sea con ent ...
        }
        sceIoDclose(filedesc);