int GZDecompress(Stream& out, Stream& in, int size, Gate2<int, int> progress)
{
byte buffer[10];
if(!in.GetAll(buffer, 10) || buffer[0] != GZ_MAGIC1 || buffer[1] != GZ_MAGIC2) {
out.SetError();
return -1;
}
int flags = buffer[3];
if(buffer[2] != Z_DEFLATED || (flags & RESERVED) != 0)
return false;
size -= 10;
if(flags & EXTRA_FIELD) {
int len = in.Get16le();
in.SeekCur(len);
size -= len;
}
if(flags & ORIG_NAME)
size -= sSkipZ(in);
if(flags & COMMENT)
size -= sSkipZ(in);
if(flags & HEAD_CRC) {
in.Get16le();
size -= 2;
}
if(in.IsEof() || size < 0) {
out.SetError();
return -1;
}
dword crc;
int sz = ZDecompress(out, in, size, progress, true, &crc);
return sz < 0 || in.Get32le() != (int)crc || in.Get32le() != sz ? -1 : sz;
}
NAMESPACE_UPP
static void sLoadBom(Stream& in, String *t, WString *wt, byte def_charset)
{
if(in.IsOpen()) {
String s;
if(in.GetLeft() > 3) {
word header = in.Get16le();
if(header == 0xfffe || header == 0xfeff) {
int n = (int)in.GetLeft() / 2;
WStringBuffer ws(n);
ws.SetLength(in.Get(~ws, 2 * n) / 2);
if(header == 0xfffe)
EndianSwap((word *)~ws, ws.GetCount());
if(wt)
*wt = ws;
else
*t = FromUnicode(ws);
return;
}
int c = in.Get();
if(c < 0)
return;
byte *h = (byte *)&header;
if(h[0] == 0xef && h[1] == 0xbb && c == 0xbf) {
if(wt)
*wt = FromUtf8(LoadStream(in));
else
*t = ToCharset(CHARSET_DEFAULT, LoadStream(in), CHARSET_UTF8);
return;
}
s.Cat(h, 2);
s.Cat(c);
}
s.Cat(LoadStream(in));
if(wt)
*wt = ToUnicode(s, def_charset);
else
*t = ToCharset(CHARSET_DEFAULT, s, def_charset);
return;
}
return;
}
