I've come to work with a strange database file format. Each DB comes with two files: one is "database.db" and the other is "database.key".
The ".db" file always starts with a 0x78 0x9C binary header, while the ".key" always contains, in a random part of the file, the string "1.00 Peter's B Tree" inside.
Looking online I found that the header 0x78 0x9C could refer to compression Zlib, but have not found any way to view the contents of the database.
Does anyone here know something that could help me with this format ? Thnaks :)
Edit 1: It appears that the ".db" file contains more than one zlib deflated streams: The signature 0x78 0x9C is not only present at the beginning of the file but in different parts of it. Fo example this are some of the streams i can find in one file:
78 9C CB 63 40 07 33 76 5B 6A AF 78 DD 54 23 CE C9 90 C4 78 89 81 89 81 F1 22 86 9A ED 6A D7 44 F6 03 D5 B0 31 30 94 60 91 F6 D4 2A 76 3B 0C 94 E6 63 60 2C 51 B6 63 00 00 22 13 11 57
78 9C CB 63 40 07 2F 53 D7 B8 9F EC 8B B2 E1 7A F1 32 87 F1 12 03 23 03 E3 45 0C 35 4B B7 68 5B CD 90 2E E7 65 67 60 2A 51 B6 63 00 00 A6 E8 0C 5D
By inflating thoose 2 streams i get 2 new uncompressed streams.
What i did then is a C# program that loaded a ".db" file and created a list of byte arrays; a byte array is a deflated stream. To do this I simply split the file at every 78 9C.
This seems to work with some of the ".db" files but, in other situations it gave me some errors like "Invalid distance code", with this stream
78 9C E2 13 FD 2F 14 9F CD 9B 29 3E 65 9F A0 F8 BC 7C 92 E2 93 EF 29 8A CF B0 A7 29 3E 8D FE 4A F1 B9 F2 0C C5 27 C4 B3 14 EF F5 5B 28 DE B5 B7 52 BC FF 6E A3 78 27 DD 4E F1 9E B8 83 E2 DD 6D 27 C5 FB D4 2E FA F0 6A EE A6 78 EF 78 EE EA 2F AA D3 91 FE 1F 2F 94 78 6C
or "Invalid stored block lenght", with this stream
78 9C 90 35 CE 34 2F 0C 7D FE A5 57 C9 FF D5 2B 47 5B B7 C4 7F 69 EA 3F 0F AC 25 F4 45 49 3D CC FF 00 E5 AE 30 40
Maybe simply splitting the file at each 78 9C is not the correct way of doing it ...
As for the ".key" files: I was able to open them using the library of Peter Graf "PBL". With the "pblKfGetAbs ()" (http://www.mission-base.com/peter/source/pbl/doc/keyfile.html) I managed to get all records related to each key in the file. These records are of 4-byte values. Searching for these values on a decompressed ".db" file (In a file that did not give me errors during the inflate process) with an hex editor I was able to get some results but nothing more. I don't understand wat thoose records on the key file means...
Thank you for the help !
