Category : checksum

currently i used from Cpp20 the Filesystem Libary and tried to create a checksum for a file with "hash_value(p)". The thing is, the value does not change. Can you provide me some advice ho to accomplish a checksum, that changes when file content is changed. I would like to stay within the range of CPP ..

Read more

I need to compare given text data with checkSumCalculator method and I try to send the data with command method. I find and changed the code according to my own needs. But I dont understand some parts. How can 0x00 hex char will be increase with given data? and how/what is the point of comparing ..

Read more

I’ve been looking for the equivalent c++ function for the linux cksum command Linux doc here: https://man7.org/linux/man-pages/man1/cksum.1.html The output looks like: $ cksum ./temp.bin 1605138151 712368 ./temp.bin I am seeking advice on if there’s any libraries or clean code snippet that can be used as the equivalent of linux cksum command in C++. Thanks for ..

Read more

I am currently attempting to use ARMv8 CRC Instructions to accelerate the calculation of CRC32/MPEG2 Checksums. The only examples I found about using these Instructions calculate regular CRC32 Checksums. uint32_t ZLIB_INTERNAL armv8_crc32_little(unsigned long crc, const unsigned char *buf, z_size_t len) { uint32_t c = (uint32_t) ~crc; while (len && ((uintptr_t)buf & 7)) { c = ..

Read more

I get WSA error code 10022 (invalid argument) when I run the following code: DWORD optValue = TRUE; if (setsockopt(s, IPPROTO_UDP, UDP_CHECKSUM_COVERAGE, (const char *)&optValue, sizeof(optValue)) == -1) { printf("setsockopt failed with error: %dn", WSAGetLastError()); exit(EXIT_FAILURE); } Prior to that I initialize winsock and my socket "s" without errors. Within my header/library include list I ..

Read more