| --- Log opened Fri Apr 04 00:00:10 2008 |
| 00:38 | | Vornicus is now known as Finerty |
| 01:10 | | Shoukanjuu [~Shoukanju@71.48.224.ns-3853] has joined #code |
| 02:00 | | Finerty is now known as Vornicus |
| 02:04 | | gnolam [lenin@Nightstar-10613.8.5.253.static.se.wasadata.net] has quit [Quit: Z?] |
| 02:12 | < Shoukanjuu> | >_> |
| 02:12 | <@McMartin> | Evening, S. |
| 02:12 | < Shoukanjuu> | Heya, McM. |
| 02:13 | < Vornicus> | It's Shou! |
| 02:14 | < Shoukanjuu> | Where?! *looks* |
| 02:15 | < Shoukanjuu> | Now, then. You said something about structs. |
| 02:15 | < Vornicus> | Yes. |
| 02:15 | < Vornicus> | Got a ROM or something handy? Something with binary data in it that you might want to extract? |
| 02:15 | < Shoukanjuu> | Shall we begin, then? Or do you need to do something first? |
| 02:15 | < Vornicus> | I can begin. |
| 02:16 | < Vornicus> | Actually before we get properly to struct, I need to do some random things with files. |
| 02:16 | < Shoukanjuu> | An n64 ROM would do, yes? |
| 02:16 | < Shoukanjuu> | Okay. |
| 02:17 | < Vornicus> | I think so, yes, so long as you know where in the rom you want to look. |
| 02:18 | < Vornicus> | and what you're looking for. |
| 02:18 | < Vornicus> | Anyway, files. |
| 02:18 | < Vornicus> | To open an existing file for reading: open(filename_as_a_string, 'r') |
| 02:19 | < Vornicus> | To open a file (existing or otherwise) for writing, obliterating hte original contents: open(filename_as_a_string, 'w') |
| 02:21 | < Shoukanjuu> | Hrm. |
| 02:22 | < Shoukanjuu> | so if the filename was "something.py" |
| 02:22 | | * McMartin has some C64 programs if you need Stuff To Look For. |
| 02:22 | <@McMartin> | Actually, I'm doing this *right now* to Java class files. |
| 02:22 | | * McMartin found a 90%-complete Java disassembler he wrote, is writing the last 10%. |
| 02:23 | < Vornicus> | Shoukanjuu: then the filename you ask for is, of course, "something.py" |
| 02:24 | < Shoukanjuu> | alright. |
| 02:24 | < Shoukanjuu> | Just to make sure. |
| 02:26 | < Vornicus> | Now, reading a file is not all that complicated: you use the file's read method to read data from the file; read(5) will read five bytes from the file, and read() will read the whole file. Both return a string. |
| 02:27 | < Vornicus> | the readline method will give you one line; if you give it a number, it will read at most that many bytes. |
| 02:27 | < Vornicus> | readlines will give you a list of all the lines in the file. |
| 02:27 | < Shoukanjuu> | Okay... |
| 02:28 | <@McMartin> | <<OS WARNING>> |
| 02:28 | < Shoukanjuu> | >_> |
| 02:28 | <@McMartin> | On Windows, newlines act funny depending on an option to open. |
| 02:28 | < Vornicus> | oh, it should be mentioned - all of these things advance the "cursor" if you go f.read(5) and then f.read(5) again, the second one will give you the five characters /after/ the result of the first one. |
| 02:28 | < Shoukanjuu> | Very big ship coming at full throttle? [/ikaruga] |
| 02:28 | < Shoukanjuu> | I see |
| 02:29 | < JeffL> | (Hey, does he know about objects?) |
| 02:29 | < Vornicus> | Actually, all three major operating systems use a different character or character pair for newlines; in text mode (the default), Python understands all three and replaces them with \n |
| 02:29 | <@McMartin> | (Not yet) |
| 02:29 | < Vornicus> | (Not yet) |
| 02:30 | <@McMartin> | (MacOS is no longer major.) |
| 02:30 | <@McMartin> | (OS X follows POSIX) |
| 02:30 | < Vornicus> | (well, okay, Classic MacOS isn't, you're right) |
| 02:30 | < JeffL> | (doesn't open() return an object?) |
| 02:30 | <@McMartin> | (Yes, but you can ignore that) |
| 02:31 | <@McMartin> | (class and friends have not yet come up) |
| 02:31 | < Shoukanjuu> | <open file 'soemthing.py', mode 'r' at 0x593c8> >_> |
| 02:32 | < Vornicus> | You can also force it to use binary mode, where it does not convert newlines; this is preferable when you're trying to use things like struct. |
| 02:32 | <@McMartin> | ( http://rafb.net/p/kIo5Il56.html ) |
| 02:32 | <@McMartin> | (In OCaml!) |
| 02:34 | < Vornicus> | To make the computer open your file in binary mode, add 'b' to the thing that already says 'r' or 'w' |
| 02:34 | < Vornicus> | so 'rb' or 'wb' for instance |
| 02:34 | <@McMartin> | I'd add that when you want text mode, it's good form to use "rt" or "wt" just to indicate that you mean it |
| 02:35 | < Vornicus> | What McM said. |
| 02:35 | < Shoukanjuu> | I see |
| 02:35 | < Shoukanjuu> | But uh |
| 02:36 | < Shoukanjuu> | It opened it to what looks like a memory address |
| 02:36 | < Shoukanjuu> | Now r eading it...I would need to specify the address |
| 02:36 | < Vornicus> | No, no |
| 02:36 | < Vornicus> | The file is not a string; the file is a file. If you want to get a string from it, use the read methods. |
| 02:38 | < Shoukanjuu> | And reading the file? I should do this after opening it, but putting in read() yields a "read not defined" thing |
| 02:38 | < Vornicus> | (this also saves memory - if you have a 2GB file you can read it in chunks, process the chunks one at a time, and then they will be discarded later)) |
| 02:38 | < Vornicus> | Show me how you opened it |
| 02:38 | < Shoukanjuu> | open("soemthing.py", 'r') |
| 02:39 | < Vornicus> | Okay. This opens the file, and returns a file object; you have to assign it to something to be able to use methods on it. |
| 02:39 | < JeffL> | (told you) |
| 02:40 | < Shoukanjuu> | It returned what I posted earlier |
| 02:40 | < Vornicus> | right |
| 02:41 | < Vornicus> | So you have to assign that to something. The usual name, if you're only working with one file, is f |
| 02:42 | < Shoukanjuu> | ....>_> f = 0x593c8 |
| 02:43 | <@McMartin> | That's just a magic number for debugging Python itself. |
| 02:43 | < Vornicus> | try f = open("something.py", 'r') |
| 02:43 | < Shoukanjuu> | Ah. Okay. |
| 02:44 | < Shoukanjuu> | Alright. |
| 02:44 | < Vornicus> | Then you call the methods on f |
| 02:45 | < Shoukanjuu> | It works :O |
| 02:46 | < Shoukanjuu> | f.read(5) yielded '#!/us' :D :D |
| 02:46 | < Vornicus> | Gasp |
| 02:46 | < Vornicus> | now try f.read(5) again. |
| 02:46 | < Shoukanjuu> | Should yield r/bin ...yes, it does |
| 02:47 | < Vornicus> | Okay, now try f.readline() |
| 02:47 | < JeffL> | (Argh, I really wish windows would let me close task manager windows once I open them) |
| 02:47 | <@McMartin> | (? Alt-F4 should work) |
| 02:48 | <@C_tiger> | JeffL try exit |
| 02:48 | < Shoukanjuu> | Read the rest of the line, ending with \n |
| 02:49 | < Shoukanjuu> | So it also shows where the newlines and assumedly, tabs are |
| 02:49 | < JeffL> | (Oh thank you McMartin. The first few days I was messing around with this computer, I accidentally found some way of triggering a way of changing the size... of the "master" bar that contains the minimize, maximize, and close buttons. And promptly somehow made it size 0, so I can't drag it to a decent size again, or reach the close button.) |
| 02:49 | < Shoukanjuu> | (I <3 Windows :D) |
| 02:49 | < Shoukanjuu> | (Wait no) |
| 02:50 | <@McMartin> | (If that's the bottom taskbar, there's this line that's still present you can drag near but not quite *at* the bottom of the screen) |
| 02:50 | < JeffL> | (Not the bottom taskbar) |
| 02:50 | <@McMartin> | (oh, wait, just read that again. o_O) |
| 02:50 | < JeffL> | (The thing that comes up when you press Ctrl-alt-del) |
| 02:50 | < Shoukanjuu> | (The heading bar for everything, where the three butons are in the vorner) |
| 02:50 | < JeffL> | (So if I ever need to end a process, I have that bar floating around above everything else... until I reboot.) |
| 02:50 | < Shoukanjuu> | (Corner, even. vV_) |
| 02:51 | < Vornicus> | Well, it fills the strings; what you're seeing in those returns is the "representation" of the string - a way of describing the string so that it can be read entirely in printable characters, without any unambiguity. |
| 02:52 | < Shoukanjuu> | Nifty :) |
| 02:52 | < Vornicus> | er |
| 02:52 | < Vornicus> | without any ambiguity |
| 02:52 | < Vornicus> | so if you were to take that string and dump it directly into another python script, it'd work as a string |
| 02:52 | <@C_tiger> | Jeff... "master bar"? |
| 02:53 | < Shoukanjuu> | Whoo :) |
| 02:57 | < Vornicus> | Aaaaanyway. |
| 02:57 | < Vornicus> | you can also iterate over files, using the for statement; it will consider each line in the file in turn. |
| 02:58 | < Vornicus> | (this is, obviously, only useful for text) |
| 02:58 | < Shoukanjuu> | Ah. |
| 02:59 | < Vornicus> | (but that's the first rule of data storage: if at all possible, Use Text Dammit) |
| 02:59 | < Shoukanjuu> | (XD) |
| 03:00 | <@C_tiger> | except when you want to frustrate other people. |
| 03:00 | < Shoukanjuu> | Heehee |
| 03:00 | < Vornicus> | There are of course exceptions; images, sounds, and movies, for instance, should all be in binary, because text would be silly. |
| 03:01 | < Vornicus> | Anyway. |
| 03:02 | < Vornicus> | You saw how earlier I talked about how you can open files for writing? There's only one method unique to writable files: write. |
| 03:02 | < Vornicus> | WHich will write any string you give it to the file. |
| 03:03 | <@C_tiger> | Question from the gallery: will it clobber? |
| 03:03 | < Vornicus> | That depends on the mode you opened the file in. |
| 03:03 | < Shoukanjuu> | Okay... |
| 03:04 | < Vornicus> | Using 'w', you will start at the beginning of the file, and you will clobber anything already in the file - even if the file was bigger than what you're putting in. |
| 03:04 | < Vornicus> | using 'a' instead, you will start at the /end/ of the file, and you will not clobber anything - the stuff just adds on to the end of the file. |
| 03:04 | < Shoukanjuu> | Okay. ^^ |
| 03:05 | <@McMartin> | "append" |
| 03:05 | <@C_tiger> | You should be aware of which you're using. |
| 03:05 | < Vornicus> | (there's also "+" modes, which are a bit tricky) |
| 03:05 | <@C_tiger> | The key lesson to learn: know how you opened the file BEFORE you write to it. |
| 03:06 | <@McMartin> | Oh yeah, also, if you're writing text, you can corrupt print to your will. |
| 03:06 | <@McMartin> | print>>f, "anything else you'd send to a print statement" |
| 03:06 | <@McMartin> | will write that stuff to f, followed by whatever counts as a newline in your current OS. |
| 03:07 | < Shoukanjuu> | Ah. |
| 03:08 | < Vornicus> | Okay. Two last methods on files; these work on both kinds. seek and tell. |
| 03:08 | < Vornicus> | Seek will move the position of the cursor in the file; by seeking, you can skip to any point in the file. |
| 03:08 | < Vornicus> | Tell tells you the cursor's position in the file; it's kinda like the opposite of seek. |
| 03:09 | | * Vornicus randomly floods the channels with rabites. |
| 03:09 | <@McMartin> | Oh, also |
| 03:09 | < Shoukanjuu> | ...Rabites? |
| 03:09 | <@McMartin> | There are "files" that represent "the keyboard" and "the screen". |
| 03:10 | | * Shoukanjuu gets the sword of mana out |
| 03:10 | <@McMartin> | DAAAAAAAAAAAAAAAAAA |
| 03:10 | | * McMartin counters them with Rabbids. |
| 03:10 | < Shoukanjuu> | Oh? |
| 03:10 | < Vornicus> | Yes. |
| 03:10 | <@McMartin> | sys.stdin and sys.stdout are "standard input" and "standard output". |
| 03:10 | < Vornicus> | (you will, of course, have to import sys first) |
| 03:10 | <@McMartin> | You'll need to import sys first, of course. |
| 03:10 | <@McMartin> | Yeah |
| 03:10 | < Shoukanjuu> | Oh, okay :_ |
| 03:14 | | mode/#code [+ooooo Bobsentme JeffL Serah Shoukanjuu Vornicus] by Vornicus |
| 03:14 | <@Vornicus> | http://docs.python.org/lib/bltin-file-objects.html <--- here are all the methods on files. |
| 03:15 | | * Shoukanjuu bookmarks this too |
| 03:16 | <@McMartin> | For struct meat, if you don't have a binary file of known format, I suggest grabbing http://www.stanford.edu/~mcmartin/misc/Hello.class |
| 03:16 | <@McMartin> | It's got some easy-to-grab stuff at the beginning, at least |
| 03:16 | <@McMartin> | (4 byte magic number, then 2-byte integers for minor version, major version, and constant count) |
| 03:16 | <@McMartin> | (all big-endian) |
| 03:20 | | * Vornicus hunts around. |
| 03:20 | <@Shoukanjuu> | Mmm... |
| 03:21 | <@Vornicus> | Okay, let's use his. |
| 03:21 | <@McMartin> | Also, the Java Class magic number is entertaining. |
| 03:21 | <@Vornicus> | Okay, put that thing in a directory that you can navigate to easily. |
| 03:23 | <@Shoukanjuu> | done |
| 03:23 | <@Vornicus> | Okay. Now, in your interactive prompt: import struct |
| 03:25 | <@Shoukanjuu> | 'okay |
| 03:27 | <@Vornicus> | struct has four functions in it: pack, unpack, pack_into, and unpack_from. We'll be working mainly with pack and unpack. |
| 03:28 | <@Vornicus> | Okay, so: f = open("Hello.class", 'r') or whatever the appropriate path to get to that file is. |
| 03:28 | <@McMartin> | rb |
| 03:28 | <@Vornicus> | oh, yes |
| 03:28 | <@Vornicus> | rb. |
| 03:28 | <@Vornicus> | want to make sure you're in binary mode, because this is a binary file. |
| 03:28 | <@Vornicus> | (we are living in a binary world, and I am a binary girl...) |
| 03:30 | <@McMartin> | (The classfile is just a Hello World program; I posted its disassembly about an hour ago here) |
| 03:30 | <@Vornicus> | Then let's read ten bytes from that file, and call it, idunno, header |
| 03:31 | <@Shoukanjuu> | Okay |
| 03:31 | <@Shoukanjuu> | \xca\xfe\xba\xbe\x00\x00\x002\x00\x1d |
| 03:31 | <@Vornicus> | There you are. |
| 03:32 | <@Vornicus> | Now: we need to take that, and unpack it into the numbers that it represents. |
| 03:32 | <@Vornicus> | unpack takes a format string and a string full of data, and returns a tuple of the stuff. |
| 03:34 | <@Vornicus> | so, here: struct.unpack(">I3H", header) |
| 03:34 | <@Vornicus> | actually, assign that to unpacked_header |
| 03:37 | <@Shoukanjuu> | struct.unpack(">l3H", unpacked_header) ? |
| 03:37 | <@McMartin> | Capital i. |
| 03:37 | <@Vornicus> | no |
| 03:37 | <@Shoukanjuu> | Also, is that a capital i or a lowercase l ? |
| 03:37 | <@Shoukanjuu> | Okay |
| 03:37 | <@Vornicus> | Capital i, and unpacked_header = struct.unpack... |
| 03:37 | <@Shoukanjuu> | The font I'm using barely differentiates the two |
| 03:37 | <@C_tiger> | Shoukanjuu use one that does. |
| 03:39 | <@Shoukanjuu> | headr notdefined? O_o; |
| 03:39 | <@Vornicus> | header? And did you assign the stuff from before to it? |
| 03:40 | <@Shoukanjuu> | not yet Xd; |
| 03:41 | <@McMartin> | You'll have to reopen the file then or you'll be trying to decode the constant pool instead of the header |
| 03:41 | <@Shoukanjuu> | so header = \xca... |
| 03:42 | <@Vornicus> | Or, you can just copy past |
| 03:42 | <@Vornicus> | and use quotes around that. |
| 03:42 | <@Shoukanjuu> | Okay |
| 03:44 | <@Vornicus> | Once you have the unpack working, tell me |
| 03:46 | <@Shoukanjuu> | I think I got it |
| 03:46 | <@Shoukanjuu> | a long number is included >_> |
| 03:46 | <@Vornicus> | All right. |
| 03:46 | <@McMartin> | Try passing that long number to hex(). |
| 03:47 | <@Shoukanjuu> | Okay |
| 03:47 | <@McMartin> | (Despite being a 32-bit number, it's larger than will fit in 32-bit signed, so it was promoted to long automatically) |
| 03:50 | <@McMartin> | Anyway, doing this should grant you something readable, once you strip off the "0x" at the front and the "L" at the end. |
| 03:50 | <@McMartin> | That's the so-called "magic number" for the binary file, that indicates which value it is. |
| 03:50 | <@Shoukanjuu> | I see |
| 03:51 | <@McMartin> | The other three values are, in order, "minor version", "major version", and "size of the constant pool" |
| 03:51 | <@Shoukanjuu> | Okay :) |
| 03:51 | <@Vornicus> | The magic number on a binary file is a number used to identify that kind of file. |
| 03:51 | <@McMartin> | So you should now be able to write a script that, given a filename: |
| 03:52 | <@McMartin> | (a) tells you whether or not it's a Java Classfile |
| 03:52 | <@McMartin> | (b) If it is, tells you the version number (major.minor, as in "46.3") and the size of the constant pool |
| 03:54 | <@McMartin> | (Java class files have a magic number that spells stuff out in hex; many others spell stuff out in ASCII) |
| 03:56 | <@McMartin> | (an iNES file, for instance is "NES" and then binary 26, the DOS EOF character) |
| 03:57 | <@McMartin> | (And a .png file has 0x89 and then "PNG") |
| 03:58 | <@Shoukanjuu> | Ahhhh. |
| 03:59 | <@McMartin> | Hmm. Actually |
| 04:00 | <@McMartin> | It's that, and then 0x0d, 0x0a, 0x1a, 0x0a. |
| 04:00 | <@McMartin> | Which is a Windows Newline, a Windows EOF, and then a POSIX newline. |
| 04:00 | <@Shoukanjuu> | Ooh. |
| 04:01 | <@Vornicus> | PNG is designed to go "oh, shit, your transfer modes are messed up" when your transfer modes are messed up. |
| 04:03 | <@Shoukanjuu> | bebafeca is the magic number for the javascript |
| 04:03 | <@Vornicus> | nope. |
| 04:03 | <@Vornicus> | cafebabe |
| 04:03 | <@Shoukanjuu> | It isn't in that order >_> |
| 04:03 | <@McMartin> | You forgot the >, I suspect. |
| 04:04 | <@McMartin> | Time for me to get dinner. |
| 04:05 | <@McMartin> | But before I go, a quick reminder that Java != Javascript |
| 04:34 | <@Vornicus> | Anyway. |
| 04:35 | <@Vornicus> | Given the format, and a tuple similar to the one generated by unpack, you can use pack, and it works backwards - it will give you a string. |
| 04:36 | <@Shoukanjuu> | o the tuple that was the long number, minor, major, and constant pool size |
| 04:36 | <@Shoukanjuu> | in conjunction with 'pack' |
| 04:36 | <@Shoukanjuu> | will give me a string vaguely reminiscent of the one earlier. I got it, I think. |
| 04:38 | <@McMartin> | Should be identical |
| 04:38 | <@Shoukanjuu> | The same one, identical, or identical in syntax? |
| 04:38 | <@Shoukanjuu> | Er...Not syntax. Not the word I'm looking for... :/ |
| 04:39 | <@Vornicus> | The same exact string. |
| 04:39 | <@Shoukanjuu> | Okay, then. |
| 04:40 | <@Shoukanjuu> | And the magic number will be different for other file types, yes? |
| 04:41 | <@McMartin> | Right. |
| 04:41 | <@McMartin> | Also how long it is, etc. |
| 04:41 | <@Shoukanjuu> | Whoo. |
| 04:41 | <@McMartin> | Basically, well-designed binary files have some way of identifying what kind of file they are. |
| 04:42 | <@Shoukanjuu> | Okay O: |
| 04:43 | <@McMartin> | (Not all files are well-designed, but the chances of a non-well-designed file accidentally having the right magic number are slim indeed) |
| 04:43 | <@Shoukanjuu> | (I would imagine s) |
| 04:43 | <@Shoukanjuu> | (so&*) |
| 05:00 | | AnnoDomini [AnnoDomini@83.21.59.ns-4888] has joined #Code |
| 05:00 | | mode/#code [+o AnnoDomini] by ChanServ |
| 05:07 | <@Vornicus> | Shoukanjuu: so, the reason I was wondering about ROMs - you can run a hex editor, right? |
| 05:07 | <@Shoukanjuu> | Yes |
| 05:08 | | JeffL [JPL@Nightstar-12038.dsl.sndg02.pacbell.net] has quit [Connection reset by peer] |
| 05:08 | <@Vornicus> | Haven't you occasionally said "dammit, I wish I didn't have to do all this crap by hand"? |
| 05:09 | <@Shoukanjuu> | Not really |
| 05:09 | <@Vornicus> | Heh. Well, okay. The point of struct is, you don't have to do all this crap any more. |
| 05:10 | | JeffL [JPL@Nightstar-12038.dsl.sndg02.pacbell.net] has joined #code |
| 05:11 | <@Shoukanjuu> | :O |
| 05:11 | <@Shoukanjuu> | Find and replace? XD |
| 05:12 | <@C_tiger> | Ok, find and replace is a sign of bad programming practice :P |
| 05:12 | <@Vornicus> | Only if you're using it to program. |
| 05:13 | <@Shoukanjuu> | Well, I never used it |
| 05:13 | <@Shoukanjuu> | It was nasty >.> |
| 05:15 | <@Vornicus> | YOu can use struct to take apart a big chunk of data, then edit it at your leisure (programmatically or by hand!) and then stuff it back together and put it back in place. |
| 05:16 | <@Shoukanjuu> | Ooh. |
| 05:17 | <@Vornicus> | I'm currently using struct to reverse engineer the probability distribution for planet and star types from Master of Orion. |
| 05:17 | <@Shoukanjuu> | >_> |
| 05:18 | <@C_tiger> | Don't forget, vorn-level crazy isn't the same as everyone-else-level crazy. |
| 05:18 | <@Shoukanjuu> | hehe |
| 05:18 | <@Vornicus> | (I open MoO, make a game, save it, then point the script at it) |
| 05:19 | <@Shoukanjuu> | See, I started with messing around with growth percentages in Fire Emblem games >_> |
| 05:19 | <@C_tiger> | This is one reason not to save your data in parseable text. |
| 05:20 | <@Vornicus> | What? |
| 05:20 | <@C_tiger> | vorn-hacking. |
| 05:20 | <@Vornicus> | reverse engineering? If you want to prevent that, you have to /encrypt/. Just not documenting isn't enough, when faced with a dedicated hacker. |
| 05:21 | <@C_tiger> | True. |
| 05:21 | <@Vornicus> | And even encryption won't stop the real crazies. They'll attach a debugger. |
| 05:22 | <@C_tiger> | I was trying to be funny... I guess vorncrazy is not QUITE the highest level of crazy there is. |
| 05:22 | | * Vornicus is not as crazy as TF. |
| 05:22 | <@Shoukanjuu> | Hehehe |
| 05:23 | <@Vornicus> | TF, see, one of his main projects is a level editor for System Shock. |
| 05:24 | <@Vornicus> | Where the data files are compressed with an absolutely insane algorithm. |
| 05:26 | | * McMartin uses Python a lot for reorganizing large chunks of the UQM codebase. |
| 05:26 | <@Vornicus> | ah, code that writes code. |
| 05:40 | <@McMartin> | Sort of |
| 05:40 | <@McMartin> | More "too much data to collate by hand" these days |
| 05:41 | <@Vornicus> | Well, okay. |
| 05:41 | <@McMartin> | I'M GIVE UP YOUR APPELLATION'S TECHNICAL MONKEY |
| 05:41 | <@Vornicus> | okay. |
| 05:42 | | * Vornicus imagines the guy from Zero Wing saying that. |
| 05:42 | <@McMartin> | That's actually Gradius III |
| 05:42 | <@McMartin> | I have no idea. |
| 05:42 | <@Shoukanjuu> | Say what |
| 05:42 | <@Shoukanjuu> | I have pings on Gradius III |
| 05:42 | <@Shoukanjuu> | >_> |
| 05:43 | | * McMartin was watching a tool-assisted superplay video of Gradius III - that line appeared after the credits. |
| 05:43 | <@Shoukanjuu> | Hehe |
| 05:43 | <@Shoukanjuu> | I beat Gradius III in hard without options :3 |
| 05:43 | <@McMartin> | Which edition? |
| 05:44 | <@Shoukanjuu> | SNES |
| 05:44 | <@Vornicus> | "superplay" video? What, does he kill /everything/? |
| 05:45 | <@Shoukanjuu> | Well |
| 05:45 | <@McMartin> | Vornicus: Almost. Stage 7 it is physically impossible to do so. |
| 05:45 | <@Shoukanjuu> | Yeah >_> |
| 05:45 | <@Vornicus> | ...wow. |
| 05:45 | <@Shoukanjuu> | See, in Hard Mode, when you aren't using Options |
| 05:45 | <@Shoukanjuu> | Superplay can mean any mumber of things. |
| 05:45 | <@Shoukanjuu> | Like surviving. |
| 05:46 | <@McMartin> | This was "Arcade Mode" |
| 05:46 | <@McMartin> | Which is even worse |
| 05:46 | <@McMartin> | And still vastly weaker than the actual arcade mode. |
| 05:46 | <@McMartin> | None of the After Burner stages, for one. |
| 05:46 | <@McMartin> | (Actual Arcade Mode available with Gradius IV for PS2!) |
| 05:47 | <@Shoukanjuu> | Hehe |
| 05:47 | <@Shoukanjuu> | Ikaruga! |
| 05:47 | <@McMartin> | Ikaruga didn't do it for me. |
| 05:47 | | * McMartin is Not A Fan of bullethell shooters. |
| 05:48 | <@Shoukanjuu> | Heheh |
| 05:48 | <@McMartin> | Particularly not ones that mandate the use of some gimmick, which seems to be a defining feature. |
| 05:48 | <@McMartin> | Also not a fan of memorization shooters, which pretty much leaves the Gradii and a few special cases. |
| 05:48 | <@McMartin> | Zanac being the big one. |
| 05:49 | <@Shoukanjuu> | Heh |
| 06:11 | <@Kazriko> | Like Superstardust HD? :) |
| 06:14 | <@Shoukanjuu> | Ikaruga and Vic Viper prints :3 |
| 06:15 | <@Shoukanjuu> | We've got the Ikaruga http://i210.photobucket.com/albums/bb76/TruthinLies/100_0925.jpg and Vic Viper http://i210.photobucket.com/albums/bb76/TruthinLies/100_0931.jpg |
| 06:16 | | * Vornicus tried McM on Bullet Heck, Bullet Jeez, and Bullet Aw Fiddlesticks shooters. |
| 06:16 | <@Shoukanjuu> | I like calling it Bullet Hail instead of Hell |
| 06:16 | <@Shoukanjuu> | Because nothing gets the blood pumpimg like OMG BULLETS *dead* |
| 06:16 | <@Vornicus> | tries* |
| 06:17 | | * Vornicus also tries Bullet Phooey. |
| 06:25 | <@McMartin> | Well, see, OMG BULLETS I don't mind as long as it's relying on sweet spots instead of quirky defensive mechanics. |
| 06:26 | <@Vornicus> | What is your opinion on Meritous? |
| 06:26 | <@McMartin> | I haven't played it. |
| 06:26 | <@Shoukanjuu> | Nor have I. |
| 06:26 | <@Vornicus> | (Meritous is... hard to describe, frankly) |
| 06:27 | | * Shoukanjuu traps Vornicus in Parodius |
| 06:27 | | * Vornicus is attacked by a very large woman. |
| 06:28 | <@McMartin> | Wielding ears of corn. |
| 06:28 | <@Vornicus> | (it's a top-down rooms-shooter, vaguely like SmashTV; but your weapon is a circular shockwave) |
| 06:29 | <@Shoukanjuu> | Parsec47 D: |
| 06:43 | | * McMartin fires up Geometry Wars Galaxies for the first time in awhile. |
| 06:44 | <@Shoukanjuu> | Geometry Wars is fun :> |
| 06:44 | | * Vornicus does not know this Geometry Wars. |
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| 06:47 | <@Shoukanjuu> | I have it for DS (usign the R4DS) and for Wii( D2pro ftw >.>) |
| 06:50 | <@McMartin> | Vornicus: Robotron meets tempest. |
| 06:50 | <@McMartin> | With lots and lots of gimmicks |
| 06:50 | <@McMartin> | GW:RE is the base game which isn't nearly as much fun |
| 06:53 | <@McMartin> | Still only Bronze on CLATRIS. =( |
| 06:53 | <@Shoukanjuu> | which one was that? |
| 06:54 | <@McMartin> | Well, like it says on the tin, it's the third "classic" board. |
| 06:54 | <@McMartin> | Also the first planet in Delta system. |
| 06:54 | <@Shoukanjuu> | Ah. |
| 06:55 | <@Shoukanjuu> | I got 11,172,975 on it |
| 06:56 | <@Shoukanjuu> | SURTRIS fails ; ; |
| 06:57 | | * McMartin has a silver on SURPENTE. |
| 06:57 | | * McMartin is mainly just collecting XP for the last few drone behaviors now. |
| 07:00 | <@McMartin> | Got my silver in BATTRIS. |
| 07:00 | | * Shoukanjuu only bothered maxing out sweep |
| 07:06 | <@Vornicus> | Aha |
| 07:12 | <@McMartin> | So. COLLECT drone. Noooot one of my favorites. |
| 07:12 | | * McMartin just maxed out RAM. |
| 07:12 | | * McMartin is also fond of Attack, Defend, and Snipe. |
| 07:12 | <@McMartin> | Defend is particularly nice on survival missions. |
| 07:12 | <@McMartin> | Still sucking at the VAR and CLA boards, though. |
| 07:12 | <@McMartin> | Oh, and FLI and ORB. =( |
| 07:12 | <@McMartin> | MAS I'm pretty decent on, though. |
| 07:14 | <@McMartin> | YES |
| 07:14 | <@McMartin> | Got the Bronze on SURTETRA. |
| 07:27 | <@McMartin> | And on CLAPENTE. And Collect is up to level 5. |
| 07:27 | <@McMartin> | That's good enough for tonight, I think. |
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| 18:28 | <@Bobsentme> | Ok, after asking several people, reading half the internet, and so forth, I am still at a loss. |
| 18:29 | <@Bobsentme> | I cannot, for the life of me, figure out how to turn the second field of a text file into a variable in bash |
| 18:56 | <@Vornicus-Latens> | You'll need to use awk, but I don't know awk |
| 18:56 | <@C_tiger> | I didn't know text files had multiple fields :( |
| 19:00 | | AnnoDomini is now known as Lance |
| 19:04 | <@ToxicFrog> | You don |
| 19:04 | <@Bobsentme> | C_tiger: That may very well be my problem. |
| 19:04 | <@ToxicFrog> | t need awk, but it makes things easier |
| 19:04 | <@ToxicFrog> | However, the way I generally do it - |
| 19:05 | <@ToxicFrog> | cat file | { while read first second rest; do echo "first field is $first, second is $second, the rest of the line is $rest"; done } |
| 19:05 | <@Bobsentme> | The goal is to take two text files, formatted as "NAME PHONE#" and "NAME DAYOFWEEK" and make one file that has "NAME PHONE# DAYOFWEEK" |
| 19:06 | <@Bobsentme> | Oh, and just to make it hard, we HAVE to use a FOR loop |
| 19:06 | <@Vornicus-Latens> | Okay, /that/ has awk /all over it/ |
| 19:06 | <@ToxicFrog> | Personally I wouldn't use awk for that either |
| 19:06 | <@Vornicus-Latens> | no? |
| 19:07 | | * ToxicFrog fiddles for a moment |
| 19:07 | <@Vornicus-Latens> | ...well, true, you'll probably want something that throws objects around, drop into perl or python or something |
| 19:07 | <@ToxicFrog> | No, I mean, I'd use plain bash |
| 19:07 | <@Bobsentme> | crap, I got my scripts mixed up. THIS one doesn't need a for loop. |
| 19:08 | <@C_tiger> | Oh... as in a text file with multiple columns? |
| 19:08 | <@Bobsentme> | I thought it would be easier to use one though. |
| 19:08 | <@Bobsentme> | c_tiger: technically, no. There is only 1 space after each name, and the names are varying lenghts |
| 19:09 | <@ToxicFrog> | It made slightly more complicated by having multiple input files, but not hugely so |
| 19:09 | <@Bobsentme> | lengths. |
| 19:09 | <@C_tiger> | Bobsentme: ok, but it's all one text file. |
| 19:10 | <@C_tiger> | Somehow I was under the impression that you had a magic text file with two "parts" |
| 19:10 | <@ToxicFrog> | No, he has two text files containing newline-seperated records with space-seperated fields |
| 19:10 | <@C_tiger> | Like you'd read halfway, hit a EOF but there's a second magic section. |
| 19:10 | <@Bobsentme> | yes, "NAME(space)PHONE#" is one, and "NAME(space)DAYOFWEEK" is the second. |
| 19:10 | <@Vornicus-Latens> | Do they both have the same names in them? |
| 19:11 | <@Bobsentme> | I have to combine them into text file #3 as columns with "NAME PHONE# DAYOFWEEK" |
| 19:11 | <@Bobsentme> | Yes |
| 19:11 | <@ToxicFrog> | Oh, right, that makes it trivial |
| 19:11 | <@Vornicus-Latens> | Are they sorted? |
| 19:11 | <@ToxicFrog> | You don't even need to sort it |
| 19:11 | <@Bobsentme> | No, but I know how to sort them. |
| 19:11 | <@ToxicFrog> | Although that will help if you can guarantee that each contains exactly the same set of names |
| 19:11 | <@Bobsentme> | My problem is string manipulation. Every loop I do counts the space as a new line |
| 19:12 | <@C_tiger> | Are any of the names repeated? |
| 19:12 | <@C_tiger> | can you guarantee that the names are the same and in the same order? |
| 19:12 | <@Bobsentme> | So, when I do: for name in `cat textfile1`; do echo $name; done; I get the name AND Phone # |
| 19:13 | <@Bobsentme> | The names are the same, but in different orders |
| 19:13 | <@C_tiger> | Ok, do the names have spaces in them? |
| 19:13 | <@ToxicFrog> | I'd just do it like: cat file1 | { while read name phone; do egrep "^$name" file2 | read _ date; echo "$name $phone $date"; done } |
| 19:13 | <@Bobsentme> | No, it's just first names |
| 19:13 | <@ToxicFrog> | Or similar. |
| 19:14 | | * Vornicus-Latens Learns! |
| 19:14 | <@ToxicFrog> | You could alternately do entertaining things by opening both files at once and feeding them to read usig the -u option, which has the advantage of being much faster |
| 19:14 | <@Bobsentme> | -u option? |
| 19:15 | <@ToxicFrog> | you can go "read -u fd" to read from a given file descriptor rather than stdin |
| 19:16 | <@ToxicFrog> | Like, say: |
| 19:16 | <@ToxicFrog> | 5<>file1 |
| 19:16 | <@ToxicFrog> | 6<>file2 |
| 19:17 | <@ToxicFrog> | read -u 5 name date; read -u 6 _ phone; |
| 19:17 | <@ToxicFrog> | echo $name $date $phone |
| 19:17 | <@Vornicus-Latens> | That there only works if they're in the same order; |
| 19:17 | <@ToxicFrog> | Aah, yes |
| 19:17 | <@Vornicus-Latens> | you should sort first if you do it that way. |
| 19:18 | <@ToxicFrog> | So you sort them first |
| 19:19 | <@Bobsentme> | http://rafb.net/p/0Hph6b89.html |
| 19:19 | <@Bobsentme> | That's file one |
| 19:20 | <@Bobsentme> | File 2 |
| 19:20 | <@Bobsentme> | http://rafb.net/p/3Bias272.html |
| 19:20 | <@Bobsentme> | AFTER the sort. |
| 19:20 | | Vornicus-Latens is now known as Vornicus |
| 19:25 | <@Bobsentme> | I think name is already taken, as when I just tried to echo it, it echoed MY name |
| 19:26 | <@Bobsentme> | Which is nowhere in the file. XD |
| 19:42 | <@Vornicus> | There are some reserved names |
| 19:43 | <@Vornicus> | So, use something other than "name" |
| 19:43 | <@Vornicus> | say "on_call_name", or something silly |
| 19:43 | <@Bobsentme> | right |
| 19:45 | <@Bobsentme> | ok, I'm lost. |
| 19:46 | <@Bobsentme> | Per you guys, use a while loop, with read -u fd, right? |
| 19:46 | <@Vornicus> | Looks it, yes. |
| 19:46 | <@Bobsentme> | ok, just checking. |
| 19:50 | <@Bobsentme> | sadly, I think I am now more confused than I started. |
| 19:52 | <@Bobsentme> | I was hoping there was some bash equivilent to just typing "for %f %f in (file1) do echo %f %g", but it looks like there isn't. |
| 20:23 | | Alek [~omegaboot@70.131.130.ns-21959] has joined #code |
| 20:23 | < Alek> | grep '[n-z](ac)+k' |
| 20:23 | < Alek> | what does this do? >_> |
| 20:26 | <@jerith> | Searches (on stdin, unless you give it a list of files) for something that matches "any lowercase letter from n to z, followed by one or more instances of 'ac', followed by k". |
| 20:26 | <@jerith> | Examples of matching strings are "lacack" and "yack" and "nacacacacacacack" |
| 20:27 | <@jerith> | I heartily recommend finding and read a good regular expression tutorial. |
| 20:32 | < Alek> | interestingly enough, it requires either egrep or the -e option, apparently. |
| 20:33 | < Alek> | or whatever the option is to force extended. I forget. |
| 20:33 | < Alek> | with plain grep, it returns nothing. |
| 20:33 | < Alek> | no matches. |
| 20:38 | <@jerith> | Oh, because of the grouping. |
| 20:38 | < Alek> | how do you tell sed to use more than one pattern file? |
| 20:38 | <@jerith> | Try \( and \) in plain grep. |
| 20:38 | < Alek> | sed -f pattern -f pattern file |
| 20:38 | < Alek> | will that work? |
| 20:38 | <@jerith> | Dunno. I tend to chain seds if I need more than one. |
| 20:39 | < Alek> | If you had more than one sed command (cmd1 and cmd2) to execute |
| 20:39 | < Alek> | again a file (inFile), identify 2 different ways (with a single sed command) |
| 20:39 | < Alek> | that you could process these sed commands: |
| 20:48 | | * Bobsentme sighs |
| 20:49 | <@Bobsentme> | all I get when testing commands are errors. |
| 20:55 | <@Bobsentme> | What if I do if statements? Something along the lines of "If $name in `cat file1` != $name in `cat file2`, do echo $name >> phonelist else $name >> name" |
| 21:06 | <@Bobsentme> | Interesting to note: |
| 21:06 | <@Bobsentme> | When you say: oncall=`cat file1` |
| 21:06 | <@Bobsentme> | it sets $oncall to the entire file |
| 21:07 | <@Bobsentme> | If you try "for oncall in `cat file1`; echo $oncall; done", you get ONE LINE AT A TIME |
| 21:08 | | * Bobsentme beats bourne |
| 21:17 | < Alek> | huh |
| 21:17 | < Alek> | -f -f works |
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| 22:04 | <@Bobsentme> | ? |
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| --- Log closed Sat Apr 05 00:00:21 2008 |