WININET: implement InternetTime{From,To}SystemTime{A,W} (#4)

[Joris Huizer]

Hans Leidekker wrote:

Well, if you really want to be sure no bad string overflows occur, this 
function is still not save:

> +/***********************************************************************
> + *           InternetTimeToSystemTimeW (WININET.@)
> + */
> +BOOL WINAPI InternetTimeToSystemTimeW( LPCWSTR string, SYSTEMTIME* time, DWORD reserved )
> +{
> +    unsigned int i;
> +    WCHAR *s = (LPWSTR)string;
> +
> +    TRACE( "%s %p 0x%08lx\n", debugstr_w(string), time, reserved );
> +
> +    if (!string || !time || reserved != 0) return FALSE;
> +
> +    /*  Convert an RFC1123 time such as 'Fri, 07 Jan 2005 12:06:35 GMT' into
> +     *  a SYSTEMTIME structure.
> +     */
> +
> +    while (*s && !isalphaW( *s )) s++;
> +    if (*s == '\0' || *(s + 1) == '\0' || *(s + 2) == '\0') return FALSE;
> +    time->wDayOfWeek = 7;
> +
> +    for (i = 0; i < 7; i++)
> +    {
> +        if (toupperW( WININET_wkday[i][0] ) == toupperW( *s ) &&
> +            toupperW( WININET_wkday[i][1] ) == toupperW( *(s + 1) ) &&
> +            toupperW( WININET_wkday[i][2] ) == toupperW( *(s + 2) ) )
> +        {
> +            time->wDayOfWeek = i;
> +            break;
> +        }
> +    }

What happens if, the string ends with WININET_wkday[i][0] or 
WININET_wkday[i][1] ?

> +
> +    if (time->wDayOfWeek > 6) return FALSE;
> +    while (*s && !isdigitW( *s )) s++;

What happens if s just became NULL in this loop ?

> +    time->wDay = strtolW( s, &s, 10 );
> +
> +    while (*s && !isalphaW( *s )) s++;
> +    if (*s == '\0' || *(s + 1) == '\0' || *(s + 2) == '\0') return FALSE;
> +    time->wMonth = 0;
> +
> +    for (i = 0; i < 12; i++)
> +    {
> +        if (toupperW( WININET_month[i][0]) == toupperW( *s ) &&
> +            toupperW( WININET_month[i][1]) == toupperW( *(s + 1) ) &&
> +            toupperW( WININET_month[i][2]) == toupperW( *(s + 2) ) )
> +        {
> +            time->wMonth = i + 1;
> +            break;
> +        }
> +    }

What happens if, the string ends with WININET_month[i][0] or 
WININET_month[i][1] ?


> +    if (time->wMonth == 0) return FALSE;
> +
> +    while (*s && !isdigitW( *s )) s++;
> +    if (*s == '\0') return FALSE;
> +    time->wYear = strtolW( s, &s, 10 );
> +
> +    while (*s && !isdigitW( *s )) s++;
> +    if (*s == '\0') return FALSE;
> +    time->wHour = strtolW( s, &s, 10 );
> +
> +    while (*s && !isdigitW( *s )) s++;
> +    if (*s == '\0') return FALSE;
> +    time->wMinute = strtolW( s, &s, 10 );
> +
> +    while (*s && !isdigitW( *s )) s++;
> +    if (*s == '\0') return FALSE;
> +    time->wSecond = strtolW( s, &s, 10 );
> +
> +    time->wMilliseconds = 0;
> +    return TRUE;
> +}

Yes it's a pain, but if you want to be really strict on this, this is 
not save yet

regards,

Joris