crc

问题 How does the probability of undetected error vary as a function of link type ? are they related at all? I mean if the link is lossy or has a higher bit error rate how this would affect the Undetected Error Probability? Is there any formula to calculate that? 回答1: What you really mean by "link type" is the error characteristics of the channel. On a channel with a high bit error rate, e.g. the number of bits in the CRC ( n ) in error somewhere in each message (where each messages gets a CRC),

问题 Which CRC-32 algorithm is used in the Java CRC-32 class ? The java doc does not give any details. What is the polynomail used and the initial value for calculaton ? 回答1: According to the source: Computes CRC32 data checksum of a data stream. The actual CRC32 algorithm is described in RFC 1952 (GZIP file format specification version 4.3). Can be used to get the CRC32 over a stream if used with checked input/output streams. The RFC1952 can be found here, but presents a quite technical read. The

问题 Which CRC-32 algorithm is used in the Java CRC-32 class ? The java doc does not give any details. What is the polynomail used and the initial value for calculaton ? 回答1: According to the source: Computes CRC32 data checksum of a data stream. The actual CRC32 algorithm is described in RFC 1952 (GZIP file format specification version 4.3). Can be used to get the CRC32 over a stream if used with checked input/output streams. The RFC1952 can be found here, but presents a quite technical read. The

来源： https://stackoverflow.com/questions/63664444/calculating-the-crc-on-the-fly-possible-or-not

来源： https://stackoverflow.com/questions/62732203/crc-error-detection-and-undetected-error-probabilities

问题 I know that implementations exist for SHA-1 and SHA-256 in System.Security.Cryptography. Is there anything built in that can compute CRC hashes? 回答1: I don't think there is one built into the .NET Framework. Use an open source version such as Damien Guard's library. 来源： https://stackoverflow.com/questions/25250651/is-there-a-c-net-standard-implementation-of-crc

问题 I know that implementations exist for SHA-1 and SHA-256 in System.Security.Cryptography. Is there anything built in that can compute CRC hashes? 回答1: I don't think there is one built into the .NET Framework. Use an open source version such as Damien Guard's library. 来源： https://stackoverflow.com/questions/25250651/is-there-a-c-net-standard-implementation-of-crc

问题 I have modified the implementation found here, to build a table generating function for a CRC4 as follows: #define bufferSize 16 crc crcTable[bufferSize]; #define POLYNOMIAL 0x13 void Init() { crc remainder; for(int dividend = 0; dividend < bufferSize; ++dividend) { remainder = dividend; for(uint8_t bit = 8; bit > 0; --bit) { if(remainder & 1) remainder = (remainder >> 1) ^ POLYNOMIAL; else remainder = (remainder >> 1); } crcTable[dividend] = remainder; printf("%hu\n", remainder); } } And

问题 The bounty expires in 5 days . Answers to this question are eligible for a +50 reputation bounty. bluejayke is looking for a canonical answer : Hi, I and probably many people, have never before heard of CRC32, and all references online seem to be for advanced users only. I need to understand in very simple terms, with a simple example, using any set of bytes as an input, how to calculate the CRC32, from complete beginning to complete end, given a simple string of bytes at section 5.5 of the

问题 For example, I calculated CRC checksum of a file of size 1024 KB and file includes 22 KB of padding of zeros at the end of the file. If given checksum of 1024 KB and size of the padding of zeros of given file Is it possible to calculate the checksum of the file without the passing. That is in above case getting the checksum of 1002 KB of the file. Assuming we don't have to recalculate the checksum again and reuse the checksum already calculated for the entire file with padding. 回答1: After a