internal int SetDictionary(ZlibCodec z, byte[] dictionary)
{
int index = 0;
int length = dictionary.Length;
if (z == null || z.istate == null || z.istate.mode != DICT0)
throw new ZlibException ("Stream error.");
if (Adler.Adler32 (1L, dictionary, 0, dictionary.Length) != z._Adler32) {
return ZlibConstants.Z_DATA_ERROR;
}
z._Adler32 = Adler.Adler32 (0, null, 0, 0);
if (length >= (1 << z.istate.wbits)) {
length = (1 << z.istate.wbits) - 1;
index = dictionary.Length - length;
}
z.istate.blocks.SetDictionary (dictionary, index, length);
z.istate.mode = BLOCKS;
return ZlibConstants.Z_OK;
}