crc32

A crc32 calculator written in C and licensed under the GPLv3 license.

Compilation

gcc -ansi -pedantic -Wall -Werror -O3 main.c -o crc32

or for Visual Studio users

cl /O2 /Ot /W2 /WX /Fecrc32 main.c

Help

  -h, --help             display this text
  -i, --input f          open file f for reading (default: stdin)
  -s, --start-at n       start cycle with n (default: 0xFFFFFFFF)
  -p, --polynomial n     use n for crc calculations (default: 0x04C11DB7)
  -e, --big-endian       use big endian calculations (default: little)
  -b, --binary           output as binary (default: hex with newline)
  -x, --xor              xor the output by 0xFFFFFFFF
  -r, --reflect          reverse the bits of the output

numbers (n) can be entered as hexadecimal or octal with prefixes

Notes

• Does not pad input.
• Big endian calculations may not be accurate. I'll look into this.