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from https://bitbucket.org/cherry9/plan9-loongson/
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encryption
this is in preparation for replacing DES ticket encryption with
something better. but first need to make the code stop making
assumptions.
the wire encoding of the Ticket might be variable length
with TICKETLEN just giving an upper bound. the details will be
handled by libauthsrv _asgetticket() and _asgetresp() funciotns.
the Authenticator and Passwordreq structures are encrypted
with the random ticket key. The encryption schmeme will depend
on the Ticket format used, so we pass the Ticket* structure
instead of the DES key.
introduce Authkey structure that will hold all the required
cryptographic keys instead of passing DES key.
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mthing->angle is a signed short, and if ANG45 * mthing->angle/45 < 0, the
result of the right shift is sign extended.
afaik, an being 16bit in the dos version of doom, you'd endup with a
negative array offset, which would just access values from adjacent arrays
(finetangent[] for finecosine[], and finecosine[] for finesine[]), and it
would result in a misplaced teleport fog in some circumstances (fog is not
in front of the player on respawn, hence "silent teleport"). so, this fix is
bug incompatible, but this only affects live multiplay.
to test:
% hget http://doomedsda.us/dm/ahfx7_2.zip | unzip -sv
extracting AHFX7_2.TXT
extracting AHFX7_2.LMP
% mv AHFX7_2.LMP ahfx7_2.lmp
% games/doom -playdemo ahfx7_2
[...]
doom 10553: suicide: sys: trap: fault read addr=0x400429e10 pc=0x205b45
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KEY_F11 and KEY_F12 are not KEY_F1+11 and KEY_F1+12 as it is assumed in
runetokey(), which prevents these keystrokes from being used. rather than
change runetokey(), it seems better to just change the key definitions in
doomdef.h (the new values don't correspond to any other keys anyway).
F11 is the gamma correction key. to make gamma correction actually work,
i_video.c:I_SetPalette must also take into account usegamma (this was just
never ported). cf i_video.c:UploadNewPalette in source code release.
F12 is the spycam key. the spycam switches the renderview to a different player
during a coop game, or when watching a multiplayer demo. this feature only
changes the renderview; sounds, palette effects, status bar, etc. are still
from the first player's perspective.
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a typo in st_stuff.c:ST_Responder prevents idclev (change level) cheat to work
in doom2 and final doom (gamemode == commercial): episode is set to 0, when
that's invalid, and ST_Responder just returns.
to test, while ingame type idclev, followed by:
. doom1: episode (1-3 or 1-4) then map number (1-9)
. doom2/final doom: map number (1-32)
incidentally, if the last digit typed is 1, the player's weapon will switch to
the fist, because of a different bug (basically kbdproc registering two events
when pressing a key, for 'c' and 'k' case).
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this bug was introduced in the plan9 port, and since i_sound.c compiles with
no warning, it was never noticed. in effect, the statement between the
unterminated comment and the next is ignored. channelids[] is used in addsfx()
to avoid re-adding certain sounds if they are already playing. one of those is
sfx_sawful, and because of this bug, it is added again each tic during which
the player fires the chainsaw, rather than reset every tic.
compare firing the chainsaw continuously with and without the patch (without
hitting an enemy).
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theres code that assumes one can dereference a char[] buffer on the stack
as a long (ghostscript gxblend.c), so make sure all automatics on the stack
are word aligned. this is not strictrly neccesary, but avoids some
trouble with unportable code.
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quanstro)
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