UE1 - UT UT Package signature

Zur · 19th Mar 2009, 10:38 PM

I'm trying to create a utility in Java to read the information contained in a package file.

However, the information on the link below doesn't seem to correspond. For example, the signature at the start should be "0x9E2A83C1" but it's not.

Am I doing things wrong or was the format changed after this was written ?

http://wiki.beyondunreal.com/Legacy:Package_File_Format

Wormbo · 20th Mar 2009, 02:34 AM

Open packages with a hex editor to see the real thing. Keep in mind that Java, unlike most other programming languages, uses big-endian byte order by default. The Unreal package file format is defined to use little-endian, though.

Zur · 20th Mar 2009, 03:06 PM

Quote:

Originally Posted by Wormbo

Keep in mind that Java, unlike most other programming languages, uses big-endian byte order by default.

Good remark. I'll see if it's possible to convert from little-endian to big-endian.

Wormbo · 20th Mar 2009, 04:03 PM

Either use "Integer.reverseBytes(in.readInt())" or simply read the value byte-wise and use bit-shifting and bitwise OR to combine them in little endian order.

19th Mar 2009, 10:38 PM	#1
Zur surrealistic mad cow Join Date: Jul. 8th, 2002 Posts: 11,313	UT Package signature I'm trying to create a utility in Java to read the information contained in a package file. However, the information on the link below doesn't seem to correspond. For example, the signature at the start should be "0x9E2A83C1" but it's not. Am I doing things wrong or was the format changed after this was written ? http://wiki.beyondunreal.com/Legacy:Package_File_Format __________________ Last edited by Zur; 20th Mar 2009 at 08:50 AM.

20th Mar 2009, 02:34 AM	#2
Wormbo Join Date: Jun. 4th, 2001 Location: Germany Posts: 5,484	Open packages with a hex editor to see the real thing. Keep in mind that Java, unlike most other programming languages, uses big-endian byte order by default. The Unreal package file format is defined to use little-endian, though. __________________ Wormbo's UT/UT2004/UT3 mods \| PlanetJailbreak \| Unreal Wiki \| Liandri Archives Everything you ever wanted to know about replication (but were afraid to ask) [in German] \| UnrealScript security considerations <elmuerte> you shouldn't do all-nighters, it's a waste of time and effort <TNSe> nono <TNSe> its always funny to find code a week later you dont even remember writing <Pfhoenix> what's worse is when you have a Star Wars moment <Pfhoenix> "Luke! I am your code!" "No! Impossible! It can't be!"

20th Mar 2009, 04:03 PM	#4
Wormbo Join Date: Jun. 4th, 2001 Location: Germany Posts: 5,484	Either use "Integer.reverseBytes(in.readInt())" or simply read the value byte-wise and use bit-shifting and bitwise OR to combine them in little endian order. __________________ Wormbo's UT/UT2004/UT3 mods \| PlanetJailbreak \| Unreal Wiki \| Liandri Archives Everything you ever wanted to know about replication (but were afraid to ask) [in German] \| UnrealScript security considerations <elmuerte> you shouldn't do all-nighters, it's a waste of time and effort <TNSe> nono <TNSe> its always funny to find code a week later you dont even remember writing <Pfhoenix> what's worse is when you have a Star Wars moment <Pfhoenix> "Luke! I am your code!" "No! Impossible! It can't be!"

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