To be friendly to other implementors of the format, the CRC field is now
zeroed out instead of completely gone.
Drop support for v2 and v3 of the ghost format, the ghost files should
have been automatically converted by the client already.
/media/ddnet/src/engine/shared/dilate.cpp:32:22: warning: The left expression of the compound assignment is an uninitialized value. The computed value will also be garbage [clang-analyzer-core.uninitialized.Assign]
and mark some false positives
/media/ddnet/src/engine/client/backend_sdl.cpp:329:30: warning: Call to 'malloc' has an allocation size of 0 bytes [clang-analyzer-optin.portability.UnixAPI]
src/engine/shared/snapshot.cpp:72:8: runtime error: signed integer overflow: -1297193910 + -1824658838 cannot be represented in type 'int'
#0 0x565165b0687d in CSnapshot::Crc() /media/ddnet/src/engine/shared/snapshot.cpp:72:8
#1 0x565165c4d20b in CClient::ProcessServerPacket(CNetChunk*) /media/ddnet/src/engine/client/client.cpp:1981:49
#2 0x565165c5d960 in CClient::PumpNetwork() /media/ddnet/src/engine/client/client.cpp:2589:6
#3 0x565165c67a71 in CClient::Update() /media/ddnet/src/engine/client/client.cpp:2856:2
#4 0x565165c72f4e in CClient::Run() /media/ddnet/src/engine/client/client.cpp:3237:4
#5 0x565165c94b7e in main /media/ddnet/src/engine/client/client.cpp:4341:11
#6 0x7fba5af2c151 in __libc_start_main (/usr/lib/libc.so.6+0x28151)
#7 0x5651659e1e0d in _start (/media/ddnet/DDNet+0x705e0d)
src/base/system.c:261:15: runtime error: null pointer passed as argument 2, which is declared to never be null
/usr/include/string.h:44:28: note: nonnull attribute specified here
#0 0x565165b348dc in mem_copy /media/ddnet/src/base/system.c:261:2
#1 0x565165aeb27d in CNetBase::SendControlMsg(NETSOCKET, NETADDR*, int, int, void const*, int, int, bool) /media/ddnet/src/engine/shared/network.cpp:313:2
#2 0x565165aeeb4e in CNetConnection::SendControl(int, void const*, int) /media/ddnet/src/engine/shared/network_conn.cpp:169:2
#3 0x565165af08c5 in CNetConnection::Feed(CNetPacketConstruct*, NETADDR*, int) /media/ddnet/src/engine/shared/network_conn.cpp:367:6
#4 0x565165aec7d2 in CNetClient::Recv(CNetChunk*) /media/ddnet/src/engine/shared/network_client.cpp:94:174
#5 0x565165c5d5ea in CClient::PumpNetwork() /media/ddnet/src/engine/client/client.cpp:2571:24
#6 0x565165c67a71 in CClient::Update() /media/ddnet/src/engine/client/client.cpp:2856:2
#7 0x565165c72f4e in CClient::Run() /media/ddnet/src/engine/client/client.cpp:3237:4
#8 0x565165c94b7e in main /media/ddnet/src/engine/client/client.cpp:4341:11
#9 0x7fba5af2c151 in __libc_start_main (/usr/lib/libc.so.6+0x28151)
#10 0x5651659e1e0d in _start (/media/ddnet/DDNet+0x705e0d)
3053: Optimize uuid lookup r=heinrich5991 a=Jupeyy
Already wrote that patch when i noticed its not about this, maybe we can use it, else nvm
Co-authored-by: Jupeyy <jupjopjap@gmail.com>
2893: Determine binary dir independently of data dir (fixes#2891) r=heinrich5991 a=def-
@Learath2 Could you check if this can be extended to also find the DDNet-Server executable on Mac?
2972: Add explicit button for current map as BG r=heinrich5991 a=def-
2974: Fix autoformatting wrt. generated files r=def- a=heinrich5991
Fix#2962.
Co-authored-by: def <dennis@felsin9.de>
Co-authored-by: Dennis Felsing <dennis@felsin9.de>
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
2948: Show File button in demo player r=heinrich5991 a=def-
to easily get the file instead of having to search for it in the file browser again. Complements #2946
2956: Add Background music volume slider r=heinrich5991 a=def-
as requested by hussainx3
2965: Clean up some data r=heinrich5991 a=def-
Co-authored-by: def <dennis@felsin9.de>
Not planning to do this automatically, but at least cleaning it up once
provides some benefit. Every header should include what it uses.
$ for i in src/**/*.h; do j=${i#"src/"}; echo $j; echo "#include <$j>\nint main() { return 0; }" | /usr/bin/c++ -DCONF_OPENSSL -DCONF_SQL -DCONF_VIDEORECORDER -DCONF_WAVPACK_CLOSE_FILE -DCONF_WAVPACK_OPEN_FILE_INPUT_EX -DGAME_RELEASE_VERSION=\"15.0.5\" -DGLEW_STATIC -D_FORTIFY_SOURCE=2 -I/usr/include/freetype2 -I/usr/include/opus -I/usr/include/SDL2 -I/usr/include/wavpack -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -Isrc -I/usr/include/mysql -I/home/deen/sys/include/ -O2 -g -DNDEBUG -fdiagnostics-color=always -fstack-protector-all -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wformat=2 -Wno-nullability-completeness -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wrestrict -std=gnu++11 -o /dev/null -x c++ -; done
Ignored: tuning.h, variables.h, config_common.h, mapitems_ex_types.h, mapbugs_list.h, protocol7.h, teehistorian_ex_chunks.h, protocol_ex_msgs.h, config.h, config_variables.h, external, keynames.h
Purely automatic change. In case of conflict with this change, apply the
other change and rerun the formatting to restore it:
$ python scripts/fix_style.py
2898: Inform players that they are in team already r=heinrich5991 a=def-
2901: Remove failed downloaded files immediately r=heinrich5991 a=def-
Especially skins were only deleted after they were requested again
2908: Don't log skin downloading progress r=heinrich5991 a=def-
since it's not really interesting for most players, as long as things work fine
Co-authored-by: def <dennis@felsin9.de>
As suggested by BannZay on Discord. We scale down when we notice that
no responses arrive. The idea is that player's internet has become
faster than when DDNet started, so increasing the default is ok.
2814: Remove saving to other servers r=Learath2 a=def-
sv_sql_valid_servernames is no longer required
2818: Load fonts from memory (fixes#2810) r=Learath2 a=def-
Missing: Freeing the memory again. But not so important since we keep
the same fonts until end of process anyway in our case.
@QingGo Could you give this a try from the Github build artifacts? If not, I can provide you a nightly build.
Co-authored-by: def <dennis@felsin9.de>
2598: Allow specifying an OpenGL version manually r=def- a=Jupeyy
Ofc don't merge, we'll test it first, and if we want merge it, i'd need to enable shader compability for OpenGL 4+, and general support for OpenGL 3.1 and 3.2(bcs i think they already don't allow some older GL commands).
Also i never really read in the OpenGL 1.x specification, i remember that older OpenGL versions required glBegin and stuff like that
Co-authored-by: Jupeyy <jupjopjap@gmail.com>
2595: Change default from borderless to fullscreen r=Learath2 a=def-
Switching the default means everyone with borderless window will be
switched to fullscreen. Fullscreen has lower latency and better
performance.
As suggested by Shyzo and voted on on Discord.
Co-authored-by: def <dennis@felsin9.de>
Switching the default means everyone with borderless window will be
switched to fullscreen. Fullscreen has lower latency and better
performance.
As suggested by Shyzo and voted on on Discord.
2465: Sqlite3 support and prepared statements r=heinrich5991 a=Zwelf
This PR changes the abstraction layer of the score backend to thin abstractions over the MySQL and SQLite3 library. It executes all Queries in one worker thread making it easier to use the ddnet thread pool. This doesn't change much, because each the mysql-connection was locked with `m_SqlLock` beforehand, serializing writes and reads respectively.
Behavior change (even though I tried to minimize them):
* `sv_use_sql` is used to determine if mysql server should be added
* `sv_sql_failure_file` is replaced by `sv_sqlite_file`
* `sv_sqlite_file` is either used as a backup server when `sv_use_sql` is enabled or as the primary read+write server when `sv_use_sql` is disabled
* `/load` now escapes the like-string
Since I am not good at designing config file commands, I would appreciate feedback on this part.
WIP:
* [x] rewrite SQL statements to work in both MySQL and SQLite (preferable just ANSI-SQL)
* [x] create tables (`COLLATE BINARY` and encoding info)
* [x] store rank (UPSERT for points)
* [x] load birthday (different function in sqlite for time handling)
* [x] `/mapinfo` (`convert(? using utf8mb4) COLLATE utf8mb4_general_ci`)
* [x] `/map` (`convert(? using utf8mb4) COLLATE utf8mb4_general_ci`)
* [x] store teamrank (`GROUP_CONCAT`)
* [x] `/teamrank` (`GROUP_CONCAT`)
* [x] ~`/top5team` (`GROUP_CONCAT`)~ doesn't contain GROUP_CONCAT
* [x] `/times` (`UNIX_TIMESTAMP`)
* [x] `/load` without any arguments (`UNIX_TIMESTAMP`)
* [x] all commits compiling, making future bisect easier
* [x] write a sqlite_to_mysql script
* [x] write an old_file_server to sqlite script
* [x] gracefully shutdown DbPool
Co-authored-by: Zwelf <zwelf@strct.cc>
2390: Support cl_show_hook_coll_own/other 2 to always show (fixes#2383) r=heinrich5991 a=def-
hook collision, without broadcasting to other players.
Removed cl_show_hook_coll_always in return
Renamed cl_video_showhookcollother to cl_video_show_hook_coll_other for consistency
Co-authored-by: def <dennis@felsin9.de>
hook collision, without broadcasting to other players.
Removed cl_show_hook_coll_always in return
Renamed cl_video_showhookcollother to cl_video_show_hook_coll_other for consistency
2335: Make it more clear that this is a sixup translation server r=heinrich5991 a=def-
2336: Set skill level for Sixup (fixes#2334) r=heinrich5991 a=def-
2340: Keeping multiple states consistent is hard (fixes#2315) r=heinrich5991 a=def-
let's go recount every time
2342: Don't forget video recorder fps setting r=heinrich5991 a=def-
after switching to non-videorecorder client
2349: Document which MySQL/MariaDB versions we require (fixes#2343) r=heinrich5991 a=def-
Co-authored-by: def <dennis@felsin9.de>
2279: Only forbid resizing when videorecorder is recording r=heinrich5991 a=def-
2327: List data files in `CMakeLists.txt` r=def- a=heinrich5991
This fixes missing files for people recompiling when we add new data
files.
Co-authored-by: def <dennis@felsin9.de>
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
2202: Send DDNet version early in the connection process r=Learath2 a=heinrich5991
This gets rid of the problem that we don't know whether we should send
full snapshots to clients because they haven't told us about them being
DDNet yet.
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
This gets rid of the problem that we don't know whether we should send
full snapshots to clients because they haven't told us about them being
DDNet yet.
2070: Fix demo recording with broken maps r=heinrich5991 a=Learath2
Apparently there are maps out there with broken headers advertising the wrong map size. This allows demos to be recorded on those.
Example of such a map is `ctf4_old_d668e9fa_2f472051b26b6bffaa4af8990cf882cafd6364e00e1333b77762cb9911e49464.map`
Hosted on `Allround Network`
Reported by teini94 on discord
Co-authored-by: Learath <learath2@gmail.com>
2071: Add an option to only start a new demo when connect while automatically record demos r=def- a=sirius1242
Origin auto demo recording of ddnet will generate lots of demo files especially when playing in mods which have shorter rounds, such as infclass. I added a new option to open a new demo file only when connect to server (include map changing), this is disabled by default, and can use `cl_auto_demo_on_connect 1` to open. It works only when `cl_auto_demo_record` open.
Co-authored-by: sirius <sirius.ustc@gmail.com>
1981: Fix: background colors being set to white r=def- a=Aerll
After changing either of background colors in ddnet tab in settings and reopening the client, both become white.
Co-authored-by: Aerll <31746984+aerll@users.noreply.github.com>
1925: Don't bundle libcurl for Linux r=Learath2 a=heinrich5991
It's installed basically everywhere and just increases release size.
They're serious about backward compatibility and haven't had a breaking
change in ages.
1929: Remove space at end of cfg description r=Learath2 a=ChillerDragon
Happy hacktoberfest :octocat:
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
Co-authored-by: ChillerDragon <chillerdragon@gmail.com>
- videorecorder only works for recording demos now
- demoplayer was modified to allow controll over the time that passed
in order to get perfect fps, IVideo controlls how much time passed,
basically every rendercall sets the time to record the next frame
I talked to coffee (creator of both mods) and he said it is okay to use zoom on the mods, also: eye emotes work there so the eye wheel is also supported. I have updated both mods to ddnet master so they have all the new stuff
1845: Fix infectionZ gamemode seen as DDNet r=heinrich5991 a=fokkonaut
InfectionZ's gametype is somehow infection, instead of infectionZ
Co-authored-by: fokkonaut <35420825+fokkonaut@users.noreply.github.com>
OK, maybe not actually remove because it is kept for fallback when the
new method isn't available.
The whole gametype parsing business had the same downsides as user agent
parsing on the web, hence I removed it while keeping behavior the same.
This allows servers to explicitly opt in or out of certain bug
workarounds and other client behavior. This increases the complexity of
different configurations that are available in the client (which is a
bad thing).
Number of minutes of active racing time before being asked to confirm
disconnecting, disconnecting dummy or quitting through GUI. Defaults to
20 minutes, -1 to disable, 0 to always enable.
Also removed confirmation to quit when in main menu, except when having
an unsaved map in editor.
Spectate and kill should already be safe thanks to server-side kill
protection.
- As requested by qshar and KoG players
- Similar to DDNet tab
- Info fetched from servers-kog entry from https://info.ddnet.tw/info
- Also supports countries and types
- Doesn't inform whether map has been finished
- Generalized the code a bit but it's still ugly
- Depends on #1533, also shows KoG servers as official/verified
And persist the result. Helps with the workflow described by Shyzo on
Discord:
> I mean after i press ctrl-f or fetch info. then i want to sort by marker (from ... to 0) and just delete every demo without a marker. either in a whole (not possible i think) or just one by one. but I think after deleting one demo the order of demos change again
> so i have to fetch info again, delete one. fetch info again. delete one
> and so on
Previously it removed one entry from m_aTimestamps before having filled
it entirely, so there was a small chance that it was not the smallest
one. Only after we have filled more entries than we want to keep can we
know which ones can be deleted for sure.
1316: code improvement on gameclient.cpp r=def- a=Ryozuki
1341: Mark unused envelopes r=def- a=Learath2
Thought I'd do this one as well while looking at the editor code.
1349: Don't ignore CONNECT packets with data that we don't know r=def- a=heinrich5991
This specifically affects 0.6.5. Just treat them the same way as those
without any data.
Co-authored-by: Ryozuki <edgar@ryobyte.com>
Co-authored-by: Learath <learath2@gmail.com>
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
1329: Add support for extra map items in datafiles r=Learath2 a=heinrich5991
This works by utilizing the good old UUIDs – this way we can make sure
that we don't clash with other people extending the map format.
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
SHA256 was chosen because it is reasonably standard, the file names
don't explode in length (this rules out SHA512) and it is supported by
basically all versions of OpenSSL (this rules out SHA512/256 and SHA3).
The protocol is changed in a backward compatible way: The supporting
server sends the SHA256 corresponding to the map in the `MAP_DETAILS`
message prior to sending the `MAP_CHANGE` message. The client saves the
SHA256 obtained from the `MAP_DETAILS` message until the next
`MAP_CHANGE` message.
For servers not supporting this protocol, the client falls back to
simply opening maps like in the previous scheme.
Remove the `map_version` tool, it is not being used and would have been
a little bit effort to update.
Use the OpenSSL implementation of SHA256 if it is supported, otherwise
fall back to a public domain one.
Fix#1127.
1157: Add a way to call for external moderator help r=Learath2 a=heinrich5991
This is done by HTTP POSTing to a location specified by
`sv_modhelp_url`. We also provide a `src/modhelp/server.py` which can
use theses POSTs to forward them to Discord servers.
The POST contains a JSON object payload, with the keys `"port"` which
contains the server port, `"player_id"` which contains the calling
player's client ID, `"player_name"` which contains the calling player's
nick and `"message"` which is the user-specified message.
Make JSON-escaping function public, add tests and fix bugs uncovered by
these tests.
Supersedes #1129.
1160: Fix warning about incompatible function pointers r=Learath2 a=heinrich5991
This comes at the cost of one allocation per started thread. This should
be okay because we're about to invoke a syscall anyway.
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
This is done by HTTP POSTing to a location specified by
`sv_modhelp_url`. We also provide a `src/modhelp/server.py` which can
use theses POSTs to forward them to Discord servers.
The POST contains a JSON object payload, with the keys `"port"` which
contains the server port, `"player_id"` which contains the calling
player's client ID, `"player_name"` which contains the calling player's
nick and `"message"` which is the user-specified message.
Make JSON-escaping function public, add tests and fix bugs uncovered by
these tests.
Supersedes #1129.
1128: Remove superfluous parameter from `CServer::NewClientNoAuthCallback` r=Learath2 a=heinrich5991
The `Reset` parameter was only ever set to true, at the only call site.
Co-authored-by: heinrich5991 <heinrich5991@gmail.com>
Replace `mem_free` by `free`, and `mem_alloc` by `malloc` or `calloc`
(the latter one being used to allocate a zeroed array of elements,
sometimes, this makes a call to `mem_zero` superfluous).
This results in having to remove `mem_stats` which previously recorded
the number of allocations and their size that the Teeworlds code did
directly.
Remove OOM handling in `src/game/client/components/binds.cpp`.
Remove needless copying in the CSV code in
`src/game/client/components/statboard.cpp`.
1055: Keep track of lost frames and update time r=heinrich5991 a=Jupeyy
The problem a friend was occuring was, that on a fresh Windows install settings like cl_refresh_rate are set to 480.
Since the render calls take longer time than no render calls, it happened that client was sleeping on one update cycle and then took to long in another, where it called the render functions, leeding to less FPS than the cl_refresh_rate. this caused mouse lags and rarely frame drops.
another thing is, that select on Windows is non microsecond accurate, or just often returns too early, which caused that the refresh rate is much too high, or even ignored, (probably windows can only sleep on milliseconds, or again, is extremly inaccurate).
Another things on windows is that time_freq might be a "very odd" number ^^
i mean like on unix it's one microsecond (1,000,000 = 1s), but on windows the time_freq depends on the CPU leading to inaccurate calculation of the sleep time and render time.
This wasn't insanly huge issue, but probably skipped a few microseconds here and there.
This fix should stabilize the frames. I'd like to hear your opinion on this tho.
947: Add support for extra chunks in teehistorian r=Learath2 a=heinrich5991
This allows to add rarely-used chunks without increasing the file format
version.
953: Overhauled job system r=Learath2 a=heinrich5991
The engine now takes `std::shared_ptr<IJob>`, this will ensure the
appropriate lifetime of the given parameters, it also allows for proper
destruction. Remove the now obsolete `IFetcher` interface and `CFetcher`
class.
Also adds some locks to `CUpdater`, previously it didn't have any locks
at all.
The engine now takes `std::shared_ptr<IJob>`, this will ensure the
appropriate lifetime of the given parameters, it also allows for proper
destruction. Remove the now obsolete `IFetcher` interface and `CFetcher`
class.
Also adds some locks to `CUpdater`, previously it didn't have any locks
at all.
869: Complete rework of the ghost and race recorder r=Learath2 a=Redix
This PR fixes a lot of issues with the ghost and race recorder, introduces a new ghost file format and implements some pretty useful features.
**A quick overview:**
- When you cross the start line multiple times, both (ghost and recorder) will only restart if it is a non-solo server
- If available, both will use the race timer to recognize the start instead of searching for the start line
- Fastcap support for both
- The recorder immediately starts when the Tee spawns, so the preparation steps (which are quite important for speedruns) will be included in the demo. If you do not cross the start-line within 20 seconds, it will stop the demo until you really start.
- Better ghost menu (colors, reloading, deleting and saving ghosts)
- The ghosts are more resistant against lags (old ones were sometimes completely useless due to small lags)
- New ghosts files are significantly smaller
- Cleanup, bugfixes..
**About the new ghost format (version 4/5):**
This format is used by Teerace for over a year now. The code for handling the binary files was moved to the engine. It includes an auto updater which creates a backup of all ghosts and converts them to the new format afterwards. The major differences from the format used by DDNet right now (version 2), are the ability to store multiple types of data, the usage of delta-encoding and a more portable header.
For whatever reason, the ghost stores values for every predicted tick, but without tick information, so lost snapshots can make them unusable. The new code uses the original values from the snapshots including ticks but it can also handle the old ones without. Since hardly any server uses the high bandwidth option this practically reduces the file size.
Like the demo recorder the ghost recorder directly stores the data to a file (every 50 snapshots) instead of writing the whole file at the end of the race. Indeed this can be changed with only a few lines if the old behavior is preferred.
The updater can handle version 2 (DDNet) and 3 (old teerace format, only slightly different from version 2) files. The updating already happens when the files are scanned for generating the list in the menu and not only when you activate them. The change from version 4 to 5 was only needed due to a bug in the implementation, the ghost loader can read both.
Some numbers about the file size: (map: hotrun, both about 30 seconds)
- Old ghost: 30.4 kB (converted: 10.7 kB)
- New ghost: 5.4 kB
**One thing about the race recorder:**
The old implementation compared the new file only with the first file it found for the particular map. The new one compares with all related demos and deletes them possibly, so that only the best demo is left. Since DDNet can also store the demos without name, this might also delete demos from other players, that you might have in your directory.
To prevent this I at least check whether the demo contains the player name if `cl_demo_name` is on.
In my opinion the better solution would be to remove `cl_demo_name` and always use the player name.
teehistorian records all inputs from the players as well as the player
positions in each tick. It stores this info in a highly compressible
output format (I've achived 5x compression using xz or bz2).
- Single json file containing all information for the client
- Fetched from https://info.ddnet.tw/info?name=deen
- Replaces versionsrv, news, ddnet-maps.json and ddnet-ranks.json
- Servers are sorted by most popular ones for respective player
- Always stays < 100 ms response time, compared to occasional 50 s for
old ddnet-ranks.json
Also annotate `dbg_msg`, `str_format` and `str_timestamp_ex` so that the
compiler can determine whether the format strings are correct.
Fix the compiler warnings generated by these extra warnings -- some of
them were security issues.
This uses an extended protocol message to signal that rcon
authentication might require a username, allowing the client to enable
the username prompt.
Add a forgotten logout on key update
This also fixes a couple of potential buffer overflows. The affected
code is still buggy (doesn't do the right thing on potential buffer
overflow), but at least it won't result in crashes/out of bound writes
anymore.
This system can easily be extended by independent authors without
collisions, something the old system with plain increasing integers did
not allow.
Do this by utilizing the previously unused message code `NETMSG_NULL`
which has a value of 0.
This works for engine and game messages, snapshot items and events.
This means that we have a reliable and fast way to query for extended info,
while also not wasting network bandwidth.
The protocol is designed to be extensible, there's four bytes space for
encoding more request types (currently zeroed), and there's one string in each
response packet and one string for each player available (currently the empty
string).
The protocol itself has no problems with more than 64 players, although the
current client implementation will drop the player info after the 64th player,
because it uses a static array for storage.
Also fixes#130, the player list is just sorted each time new player info
arrives.
This prevents player name exploits due to tab completion of nicknames
that could result in unwanted commands being executed.
Print a deprecation message that is supposed to be removed in the
future.
This way, servers can no longer hijack the timeout codes of clients.
Timeout codes are generated from md5(seed + dummy + server address).
If `cl_timeout_seed` is set to the empty string, the old config options
are used instead.
reading from and writing to several different servers is now possible
TODO:
-handle Exceptions properly (try another sqlserver)
-if everything fails while writing write the insert to a file
CDataFileReader::Open(): Check the return status of io_read()
before reading the buffer, to avoid reading uninitialized data
in case the file was shorter than a full header.
CSkins::SkinScan(): Check that the image is high enough.
Edgar
ChillerDragon
