Delta Copy for Linux version 0.2.1
This program uses the great xxHash algorithm to copy only the differences between two files on a Linux system.
It works well with large to extremly large files, for example copying a disk onto another.
Useful for making incremental full disk (block-level) backups.
It breaks down the source and destination files to smaller chunks and uses multiple threads to calculate
the (xx)hash of these chunks. Then only those that differ will be copied over.
Both files will be fully read (2x file I/O), but only differences will be copied (0%<write I/O<100%).
If only a few bytes differ in a very large file, this is the way.
Currently it's tested only on Linux and useful only on a local system.
Also comes a small utility dcp-cbr, which can change n bytes in a file to random values, for testing dcp.
dcp version 0.2.1, GPLv3
https://github.com/khimera.cloud/dcpAdditional licenses:
xxHash by Yann Collet - https://cyan4973.github.io/xxHash/
OpenSSL Project - https://openssl.org/
GNU C Library - https://gnu.org/software/libc/
Usage: dcp [OPTION]... <src dev/file> <dest dev/file>
Differential copy tool using multithreaded xxHashOptions:
-h, --help show this message and exit
-l, --licenses display licensing information and exit
-V, --version show version information and exit
-v, --verbose verbose mode
-n, --dry dry-run, no-opt mode
-s, --sha256 calculate (and display) SHA256 hash after copy
-c, --copy always copy the whole while if differs
-x, --skipxx skip the xxHash on the whole file, just do xxHash tablesAdvenced options:
-1, --one-thread use only one thread while computing the chunks' hashes
--io-buffer I/O buffer size for file operations in MB - Integer 1<=N<=100, default is 1
--hash-chunk Hash chunk size, multiplier of io-buffer - Integer 1<=N<=100, default is 20
cbr stands for Change Byte Randomly, no motorcycles involved ;)
It takes 1 parameter as a filename and optionally another for the number of runs (default is 1).
DCP Change Byte Randomly version 0.2.1, GPLv3
https://github.com/khimera.cloud/dcpUsage: dcp-cbr <#times (default is 1)>