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beedy, posted Fri Mar 02, 2018 1:07 pm (32823)

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Hi,
I need help to calculate crc hash value from EA's .Big and .bh files. CRC value is same for same file in Big archive with EB identifier and BIG4 archive with .bh-files. For example "fe/ion/game/menus/onlinepostgame.big" crc calculation in bh-file is 0x194A2099. I tried CRC-32 checksum calculator and crc_scan.bms (I'm not sure how to use it) to get correct value, but I didn't get right one.

a lot of EA games has mc02 checksums, but I'm not sure is the values in big-archives calculated with that.

.big and .bh samples in attachment.

HPAndroid, posted Tue Mar 13, 2018 12:15 am (33148)

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beedy wrote:

Hi,
I need help to calculate crc hash value from EA's .Big and .bh files. CRC value is same for same file in Big archive with EB identifier and BIG4 archive with .bh-files. For example "fe/ion/game/menus/onlinepostgame.big" crc calculation in bh-file is 0x194A2099. I tried CRC-32 checksum calculator and crc_scan.bms (I'm not sure how to use it) to get correct value, but I didn't get right one.

a lot of EA games has mc02 checksums, but I'm not sure is the values in big-archives calculated with that.

.big and .bh samples in attachment.

This is what I extracted from the file patch.big

HPAndroid, posted Tue Mar 13, 2018 12:24 am (33149)

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Your patch.bh file is only the national Internet domain name (ccTLD) for Bahrain. It is managed by BATELCO.

beedy, posted Thu Aug 02, 2018 6:50 am (37163)

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Hey,

I haven't solved yet crc algorithm for files. I have tried to use crc scanner for a file which iclude path string but didn't match any results. Also I have tried calculate a custom crc32 checksum with various polynomials without correct result.

Is it possible to get correct algorithm if I know CRC and string where it is calculated. I want to add some files in .big archive that's why I need to know how the crc is calculated.

Example crcs:
attribdb/renddb.bin 3C12BC16
attribdb/renddb.opt 3C12F450
attribdb/renddb.vlt 3C131193

beedy, posted Wed Apr 17, 2019 11:49 am (47022)

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Finally solved it. Fifafs_5_3_10_alpha can generate .bh files for .big archives with right hash algorithm. Fifafs support Big4 archive types, but algorithm is same for .big with "EB" magic.
Fifafs:
http://www.playground.ru/files/fifafs_5_3_10_alpha-38781/

GHFear, posted Wed Apr 17, 2019 12:16 pm (47023)

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beedy wrote:

Finally solved it. Fifafs_5_3_10_alpha can generate .bh files for .big archives with right hash algorithm. Fifafs support Big4 archive types, but algorithm is same for .big with "EB" magic.
Fifafs:
http://www.playground.ru/files/fifafs_5_3_10_alpha-38781/

I love you man.
How does one use it tho?
I can't seem to figure it out.

beedy, posted Wed Apr 17, 2019 1:04 pm (47025)

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This found in console.txt in docs folder:
fifaFS.exe -makebh | generate .bh file for big file

GHFear, posted Wed Apr 17, 2019 1:56 pm (47026)

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beedy wrote:

This found in console.txt in docs folder:
fifaFS.exe -makebh | generate .bh file for big file

It seems to generate an extra second checksum for the .bh file that Skate doesn't use, I will make a script that rebuilds it without that second checksum and then it will be perfect

GHFear, posted Tue Apr 23, 2019 9:28 pm (47228)

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I made a batch UI to make working with fifafs simple and also added all the scripts I could find that I have made or use for EA related work.
If anyone has more scripts for EA package types and other tasks, please add them to the scripts folder and reupload everything here.
This is a BIG4/BIGF tool and will not work properly with BIG/EB files.
The tool also relies on 2 of the scripts, so don't delete the scripts folder or files.

EA BIG TOOL: https://mega.nz/#!6xpWgCKY!1uv6WGXV9JHe ... vN3cRUyq0A

beedy, posted Wed Apr 24, 2019 5:47 am (47235)

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That's great, Thank you!