winhttp(1/12): Implement WinHttpGetDefaultProxyConfiguration

[Juan Lang]

>> +static inline void copy_char_to_wchar_sz(const BYTE *src, DWORD len, WCHAR *dst)
>> +{
>> +    const BYTE *begin;
>> +
>> +    for (begin = src; src - begin < len; src++, dst++)
>> +        *dst = *src;
>> +    *dst = 0;
>> +}
>
> That looks very wrong. Is there really evidence that Unicode chars are
> truncated?

Until IDN is widely supported, non-ASCII characters are not valid in
the DNS.  There are of course several implementations of IDN, but
they're not standardized.  Would a FIXME be better if a wide character
is encountered?

>> +        l = RegQueryValueExW( key, WinHttpSettings, NULL, &type, NULL, &size );
>> +        if (!l && type == REG_BINARY && size >= 5 * sizeof(DWORD))
>> +        {
>> +            BYTE *buf = HeapAlloc( GetProcessHeap(), 0, size );
>> +
>> +            if (buf)
>> +            {
>> +                DWORD *magic = (DWORD *)buf;
>> +                DWORD *unknown = magic + 1;
>> +                DWORD *flags = unknown + 1;
>> +                DWORD *len = flags + 1;
>
> Please define an appropriate structure.

I can for the first three DWORDs, but the strings are packed.  Would
you like a structure for the first three DWORDs?
--Juan