The implementation I have written achieves its speed through use of x86 assembly code. In fact, the entire implementation of the CRC32 algorithm is written in assembly.
I use assembly via some tricks involving class modules and the object's vtable. I allocate a block of memory, write the machine code to the memory, then rewrite the functions vtable entry to point to my block of code.
It is roughly 25x faster than the current "fastest" implementation found on pscode.con that gets its speed through asm assisted bitshifting (which was written by me too) and probably 100x to 150x faster than a pure VB approach.
The project and code file(s) can be found here:
http://www27.brinkster.com/wsckvbupdates/CRC32.zip
P.S. because it is hosted on a free web server, you might have to copy the link and manually paste it rather than clicking on it.
Also, look forward to more hashing algorithms, encryptions, and etc to be written in asm taylored for use with vb6 to be released in the future!
I use assembly via some tricks involving class modules and the object's vtable. I allocate a block of memory, write the machine code to the memory, then rewrite the functions vtable entry to point to my block of code.
It is roughly 25x faster than the current "fastest" implementation found on pscode.con that gets its speed through asm assisted bitshifting (which was written by me too) and probably 100x to 150x faster than a pure VB approach.
The project and code file(s) can be found here:
http://www27.brinkster.com/wsckvbupdates/CRC32.zip
P.S. because it is hosted on a free web server, you might have to copy the link and manually paste it rather than clicking on it.
Also, look forward to more hashing algorithms, encryptions, and etc to be written in asm taylored for use with vb6 to be released in the future!