crc32

I'm looking for an implementation of CRC32 in C or C++ that is explicitly licensed as being no cost or public domain. The implementation here seems nice, but the only thing it says about the license is "source code", which isn't good enough. I'd prefer non LGPL so I don't have to fool around with a DLL (my app is closed source). I saw the adler32 implementation in zlib, but I'm checking small chunks of data, which adler is not good for. Zan Lynx Use the Boost C++ libraries . There is a CRC included there and the license is good. The SNIPPETS C Source Code Archive has a CRC32 implementation

The the other day I ran into the question GZipStream doesn't detect corrupt data (even CRC32 passes)? (Of which this might very well be a "duplicate", I have mixed feelings on the subject. I was also the one who added the CRC32 to the title, but in retrospect that feels out of place with the remainder of the post). After exploring the problem a bit on my own, I think that the issue is far greater than the other question initially portrays. I expanded upon the other question and made the test code runnable under LINQPad and attempt to better showcase the CRC32 (Cyclic Redundancy Check) issue,

I'm looking for a way to reverse a CRC32 checksum . There are solutions around, but they are either badly written , extremely technical and/or in Assembly . Assembly is (currently) beyond my ken, so I'm hoping someone can piece together an implementation in a higher level language. Ruby is ideal, but I can parse PHP, Python, C, Java, etc. Any takers? A CRC32 is only reversible if the original string is 4 bytes or less. Read the document called "Reversing CRC Theory and Practice" . This is C#: public class Crc32 { public const uint poly = 0xedb88320; public const uint startxor = 0xffffffff;

How do I calculate the CRC32 (Cyclic Redundancy Checksum) of a string in .NET? Pete This guy seems to have your answer. https://damieng.com/blog/2006/08/08/calculating_crc32_in_c_and_net And in case the blog ever goes away or breaks the url, here's the github link: https://github.com/damieng/DamienGKit/blob/master/CSharp/DamienG.Library/Security/Cryptography/Crc32.cs Usage of the Crc32 class from the blog post: Crc32 crc32 = new Crc32(); String hash = String.Empty; using (FileStream fs = File.Open("c:\\myfile.txt", FileMode.Open)) foreach (byte b in crc32.ComputeHash(fs)) hash += b.ToString(

So I have a design which incorporates CRC32C checksums to ensure data hasn't been damaged. I decided to use CRC32C because I can have both a software version and a hardware-accelerated version if the computer the software runs on supports SSE 4.2 I'm going by Intel's developer manual (vol 2A), which seems to provide the algorithm behind the crc32 instruction. However, I'm having little luck. Intel's developer guide says the following: BIT_REFLECT32: DEST[31-0] = SRC[0-31] MOD2: Remainder from Polynomial division modulus 2 TEMP1[31-0] <- BIT_REFLECT(SRC[31-0]) TEMP2[31-0] <- BIT_REFLECT(DEST[31