char write_buffer[128*1024];
void write_file(const char *readpath, const char *writepath)
{
    int fdin;
    int fdout;
    fdin = sceIoOpen(readpath, PSP_O_RDONLY, 0777);
    if(fdin >= 0)
    {
        int bytesRead = 1;
        fdout = sceIoOpen(writepath, PSP_O_WRONLY | PSP_O_CREAT | PSP_O_TRUNC, 0777);
        bytesRead = sceIoRead(fdin, write_buffer, sizeof(write_buffer));
        while((bytesRead > 0) && (fdout >= 0))
        {
            sceIoWrite(fdout, write_buffer, bytesRead);
            bytesRead = sceIoRead(fdin, write_buffer, sizeof(write_buffer));
        }

        if(fdout >= 0)
        {
            sceIoClose(fdout);
        }

        if(fdin >= 0)
        {
            sceIoClose(fdin);
        }
    }
}