Difference between revisions of "Sims 3:DBPF"

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== Package Header ==
 +
96 bytes: "standard" DBPF 2.0 format; DBBF not seen; DPPF is encrypted.
 
<pre>
 
<pre>
 
Package Header - 96 bytes: "standard" DBPF 2.0 format; DBBF not seen.
 
 
Code:
 
 
DWORD    magic ;; "DBPF"
 
DWORD    magic ;; "DBPF"
 
DWORD    major ;; 2
 
DWORD    major ;; 2
Line 13: Line 11:
 
BYTE[12] unknown3
 
BYTE[12] unknown3
 
DWORD    index_version ;; always 3
 
DWORD    index_version ;; always 3
DWORD    ;; position of index (absolute)
+
DWORD    ;; ''position'' of index (absolute)
 
BYTE[28] unknown4
 
BYTE[28] unknown4
 
+
</pre>
If position is not zero, at that position:
+
== The Index ==
DWORD ;; Index type
+
If ''position'' is not zero, at that position:
 +
<pre>DWORD ;; Index type</pre>
  
 
The count of set bits in the index type is the number of additional DWORD entries in index header:
 
The count of set bits in the index type is the number of additional DWORD entries in index header:
DWORD[(for each bit in Index type)]
+
<pre>DWORD[(for each bit in Index type)]</pre>
  
 
The number of DWORDs in an actual index entry is 8.  The entry is stored in two parts - the index header and then the entry on disk.  The header provides the data that is constant to all entries, essentially a kind of compression.
 
The number of DWORDs in an actual index entry is 8.  The entry is stored in two parts - the index header and then the entry on disk.  The header provides the data that is constant to all entries, essentially a kind of compression.
  
 
;; For each index entry on disk:
 
;; For each index entry on disk:
DWORD[(8 - number of bits in Index type)]
+
<pre>DWORD[(8 - number of bits in Index type)]</pre>
  
 
Each DWORD in an actual index entry can either come from the header or from the index entry on disk, depending on the bits set in the index type.  The order of the DWORDs in an index entry is (with matching bit number):
 
Each DWORD in an actual index entry can either come from the header or from the index entry on disk, depending on the bits set in the index type.  The order of the DWORDs in an index entry is (with matching bit number):
0 - ResourceType
+
{| class="wikitable" border="1"
1 - ResourceGroup
+
|-
2 - InstanceHi
+
|0
3 - InstanceLo
+
|ResourceType
4 - Chunkoffset ;; Absolute location in package
+
|
5 - Filesize ;; Length of data in package
+
|-
6 - Memsize ;; Length of uncompressed data
+
|1
7 - Compressed(lo WORD) | Unknown2(hi WORD) ;; Compressed is 0x0000 or 0xFFFF
+
|ResourceGroup
 +
|
 +
|-
 +
|2
 +
|InstanceHi
 +
|
 +
|-
 +
|3
 +
|InstanceLo
 +
|
 +
|-
 +
|4
 +
|Chunkoffset
 +
|Absolute location in package
 +
|-
 +
|5
 +
|Filesize
 +
|Length of data in package
 +
|-
 +
|6
 +
|Memsize
 +
|Length of uncompressed data
 +
|-
 +
|7
 +
|Compressed(lo WORD) , Unknown2(hi WORD)
 +
|Compressed is 0x0000 or 0xFFFF
 +
|}
 
(That's a total of 32 bytes per entry.)
 
(That's a total of 32 bytes per entry.)
  
Line 41: Line 66:
  
 
By Peter Jones
 
By Peter Jones
 
</pre>
 

Revision as of 04:40, 9 June 2009

Package Header

96 bytes: "standard" DBPF 2.0 format; DBBF not seen; DPPF is encrypted.

DWORD    magic ;; "DBPF"
DWORD    major ;; 2
DWORD    minor ;; 0
BYTE[24] unknown1
DWORD    ;; number of index entries - if zero, size and position also zero
BYTE[4]  unknown2
DWORD    ;; size of index on disk in bytes
BYTE[12] unknown3
DWORD    index_version ;; always 3
DWORD    ;; ''position'' of index (absolute)
BYTE[28] unknown4

The Index

If position is not zero, at that position:

DWORD ;; Index type

The count of set bits in the index type is the number of additional DWORD entries in index header:

DWORD[(for each bit in Index type)]

The number of DWORDs in an actual index entry is 8. The entry is stored in two parts - the index header and then the entry on disk. The header provides the data that is constant to all entries, essentially a kind of compression.

For each index entry on disk
DWORD[(8 - number of bits in Index type)]

Each DWORD in an actual index entry can either come from the header or from the index entry on disk, depending on the bits set in the index type. The order of the DWORDs in an index entry is (with matching bit number):

0 ResourceType
1 ResourceGroup
2 InstanceHi
3 InstanceLo
4 Chunkoffset Absolute location in package
5 Filesize Length of data in package
6 Memsize Length of uncompressed data
7 Compressed(lo WORD) , Unknown2(hi WORD) Compressed is 0x0000 or 0xFFFF

(That's a total of 32 bytes per entry.)

(Possibly confusingly, in my implementation, I actually store the index type along with the entries - keeps the data structure simpler..!)

By Peter Jones

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