<![CDATA[Redump Forum — combinecrcs-0.1]]> http://forum.redump.org/topic/13082/combinecrcs01/ Thu, 08 Aug 2013 21:06:44 +0000 PunBB 1.4.4 <![CDATA[Re: combinecrcs-0.1]]> http://forum.redump.org/post/44513/#p44513 Great tool!

ps. ir0b0t will be adding the combined crc-32 hash to the dump info page of all multitrack dumps soon, in case people want to check the integrity of their combined images.. Also, a cuesheets pack will be available as download for these images smile

]]> Thu, 08 Aug 2013 21:06:44 +0000 http://forum.redump.org/post/44513/#p44513 <![CDATA[Re: combinecrcs-0.1]]> http://forum.redump.org/post/44512/#p44512 Simply impressive, calculated (instantly) combined CRCs of individual tracks matches the one from the actual concatenated dump:

http://img822.imageshack.us/img822/8628/huq1.png

]]> Thu, 08 Aug 2013 21:00:03 +0000 http://forum.redump.org/post/44512/#p44512 <![CDATA[combinecrcs-0.1]]> http://forum.redump.org/post/44505/#p44505 Hi,

This is a tool to combine crcs.

Readme:

What:
 This can be used to combine several crc values into one.

How:
 combinecrcs <CHUNKSIZE> <CRC> [<CHUNKSIZE> <CRC>]...

Why:
 Useful for finding combined crc values of tracks in the redump.org database.

Compiling:
 Use "make" on any linux/unix/bsd console nearby, or if you must, an msys or cygwin environment.
 You need to use a relatively recent gcc (4.5.0+ ish I guess).

 This software uses crcutil-1.0 for providing fast crc calculations.
 crcutil is made by Andrew Kadatch and Bob Jenkins and can be found on http://code.google.com/p/crcutil/
 Do not contact them for support on this software.
 The Makefile will try to pull in version 1.0 through wget if it is not supplied yet.

Small word of caution:
 Relying on a crc for checking a complete image is reasonably robust against data corruption.
 However, it is not robust for data integrity checking.
 Data can easily be faked to produce any crc of ones liking, so a collide is easy to compute.
 If you want to be sure about data integrity, use a crypto hash, such as md5 or sha1.

Contact:
 At the moment, see the redump.org forum thread where you got this.

-V.

Small word of caution:
Relying on a crc for checking a complete image is reasonably robust against data corruption, but not for data integrity checking.
Data can easily be faked to produce any crc of ones liking, so a collide is easy to compute.
If you want to be sure about data integrity, use a crypto hash, such as md5 or sha1.

I updated the 0.1 archives with this warning included in the readme.
Please redownload if yours doesn't contain it.

Source: combinecrcs-0.1.tar.gz
Win32 binary: combinecrcs-0.1-bin-win32.zip

]]> Thu, 08 Aug 2013 19:28:09 +0000 http://forum.redump.org/post/44505/#p44505