FF7/LGP format - Revision history

Mav: /* Introduction */

2025-12-13T23:29:08Z

‎Introduction

2025-12-13T23:27:41Z

Rewrote the whole article with up to date information

2022-08-27T03:53:16Z

‎Section 2: Section formerly designated as "CRC Code"

2022-08-27T03:51:45Z

‎Section 2: Section formerly designated as "CRC Code"

2022-08-27T03:48:20Z

‎Section 2: Section formerly designated as "CRC Code"

2022-08-27T03:44:42Z

‎Section 2: Section formerly designated as "CRC Code"

2022-08-27T03:39:50Z

2022-08-27T03:36:42Z

2019-05-23T02:19:29Z

9 revisions imported

2018-04-04T09:34:50Z

7 revisions imported

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 == Introduction ==
-LGP (Large Game Package) is an archive format used by Final Fantasy VII to store game assets. The format is used across PC, PlayStation and other versions to package various game resources including textures, models, scripts, and other data files.
+LGP is an archive format used by Final Fantasy VII to store game assets. The format is used in the PC version of the game to package various game resources including textures, models, scripts, and other data files.
 An LGP archive consists of a header, table of contents (TOC), hash lookup table, optional path table for directories, and the actual file data. All multi-byte integers in the format are stored in '''little-endian''' format.

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 The first letter, minus the value for ascii 'a' (0x61) is the index of the set to which the file belongs.
-The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.  Since the second letter in all of the file names is ascii 'a' or greater, it means that the lowest entry index is 1, so the first entry in every group is always zero (0x0000).
+The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.  Since the second letter in all of the file names is ascii 'a' or greater, it means that the lowest entry index is 1, so the first entry (at index 0) in every group is always zero (0x0000).
 Each entry is two words.

@@ Line 47: / Line 47: @@
 The first letter, minus the value for ascii 'a' (0x61) is the index of the set to which the file belongs.
-The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.  Since the second letter in all of the file names is ascii 'a' or greater, it means that the first entry in every group is always zero (0x0000).
+The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.  Since the second letter in all of the file names is ascii 'a' or greater, it means that the lowest entry index is 1, so the first entry in every group is always zero (0x0000).
 Each entry is two words.

@@ Line 47: / Line 47: @@
 The first letter, minus the value for ascii 'a' (0x61) is the index of the set to which the file belongs.
-The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.
+The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.  Since the second letter in all of the file names is ascii 'a' or greater, it means that the first entry in every group is always zero (0x0000).
 Each entry is two words.

@@ Line 47: / Line 47: @@
 The first letter, minus the value for ascii 'a' (0x61) is the index of the set to which the file belongs.
-The second letter, minus the value for ascii ''' (0x60) is the index of the entry within the set.
+The second letter, minus the value for ascii ' ' ' (0x60) is the index of the entry within the set.
 Each entry is two words.

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 |}
-====  Section 2: CRC Code  ====
+====  Section 2: Section formerly designated as "CRC Code"  ====
-This code is used to validate the LGP archive. The bad news is I have no idea how to make it (I've figured out how to decode it, ie. find out whether the archive is valid, but I can't create my own). The good news is you don't need to! The only thing this CRC is based on is the number of files in the archive (maybe the filenames too, haven't checked that). Anyway, the TOC is the only thing this check relates to. So if you're replicating an archive from FF7 for use in the game with the same number of files and filenames you can just copy the CRC section from an existing file.
+This section is 3600 bytes.  It is 30 sets of 30 entries containing two 16-bit words each (30 x 30 x 2 x 2 = 3600)
-Normally it's 3602 bytes long (one archive may be different, possibly MAGIC.LGP). Anyway, one normally-safe way of calculating the CRC size is to find the end of the TOC and the beginning of the first file. Anything in between is probably CRC code (this is not guaranteed to work. It works with "official" archives but editors - such as [http://www.ficedula.com/ LGP Editor] - can alter the TOC to achieve extra things).
+The sets contain file-group information which is based on the first two letters of each file name.
 ====  Section 3: Actual Data  ====

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