compression

问题 Introduction I want to combine my separate Minecraft worlds into a single world and it seemed like a relatively easy feat, but as I did research it evolved into the need to make a custom program. The Struggle I started by shifting the region files and combining them in one region folder, which seemed like the obvious solution and it almost worked. Note: I've opened the files and it seems entire sectors have their coordinates stored, not entities, hence the terrain itself is spatially

问题 Long Ascii String Text may or may not be crushed and compressed into hash kind of ascii "checksum" by using sophisticated mathematical formula/algorithm. Just like air which can be compressed. To compress megabytes of ascii text into a 128 or so bytes, by shuffling, then mixing new "patterns" of single "bytes" turn by turn from the first to the last. When we are decompressing it, the last character is extracted first, then we just go on decompression using the formula and the sequential keys

问题 I get them theoretically, but I'm grappling with gzipping files in practice. How should I go about gzip compressing my files, and what needs to be done in order to use them on a shared host? Would the following work? RewriteEngine On RewriteBase / RewriteCond %{HTTP:Accept-Encoding} .*gzip.* RewriteRule ^/(.*)\.js$ /$1.js.gz [L] RewriteRule ^/(.*)\.css$ /$1.css.gz [L] AddEncoding x-gzip text.gz 回答1: You're probably going to have trouble with the MIME type of the decompressed content still

问题 Given the input from example1 on page http://michael.dipperstein.com/lzw/#example1, I am unable to get the correct result: #include <stdio.h> #include <stdlib.h> #include <string.h> #include "lzw.h" void print_hex(unsigned char str[], int len) { int idx; for (idx = 0; idx < len; idx++) printf("%02x", str[idx]); } int main() { FILE *fpIn; /* pointer to open input file */ FILE *fpOut; /* pointer to open output file */ FILE *fptr; char test_str_lzw[] = { "this_is_his_thing" }; fptr = fopen("lzw

问题 I am trying to decompress a .7z (or .xz or .lzma) file using boost library 1.67.0 on a Linux platform with the following code: vector<T> readFromCompressedFile(string input_file_path, string output_file_path) { namespace io = boost::iostreams; stringstream strstream; ifstream file(input_file_path.c_str(), ios_base::in | ios_base::binary); ofstream out(output_file_path, ios_base::out | ios_base::binary); boost::iostreams::filtering_istream in; in.push(io::lzma_decompressor()); in.push(file);

问题 I'm looking for a file type for storing archives of systems that have been decomissioned. At the moment, we primarily use tar.gz, but finding and extracting just a few files from a 200GB tar.gz archive is unwieldy, since tar.gz doesn't support any sort of random-access read provision. (And before you get the idea, mounting a tgz using FUSE doen't make it better.) Here's what we've found so far -- I'd like to know what other options there are: tar.gz -- poor random-access read zip -- lacks

问题 I have some large files with several category columns. Category is kind of a generous word too because these are basically descriptions/partial sentences. Here are the unique values per category: Category 1 = 15 Category 2 = 94 Category 3 = 294 Category 4 = 401 Location 1 = 30 Location 2 = 60 Then there are even users with recurring data (first name, last name, IDs etc). I was thinking of the following solutions to make the file size smaller: 1) Create a file which matches each category with

问题 I have a RAR file and a ZIP file. Within these two there is a folder. Inside the folder there are several 7-zip (.7z) files. Inside every 7z there are multiple files with the same extension, but whose names vary. RAR or ZIP file |___folder |_____Multiple 7z |_____Multiple files with same extension and different name I want to extract just the ones I need from thousands of files... I need those files whose names include a certain substring. For example, if the name of a compressed file

问题 I have a RAR file and a ZIP file. Within these two there is a folder. Inside the folder there are several 7-zip (.7z) files. Inside every 7z there are multiple files with the same extension, but whose names vary. RAR or ZIP file |___folder |_____Multiple 7z |_____Multiple files with same extension and different name I want to extract just the ones I need from thousands of files... I need those files whose names include a certain substring. For example, if the name of a compressed file

问题 Is there a way to know if the byte[] has been compressed (or not) by GzipStream .net class? EDIT: Just want to know if the byte[] array has been compressed (since I will always be using GzipStream to compress and decompress) 回答1: A GZipStream is a DeflateStream with an additional header and trailer. The format is specified in RFC 1952. The .NET 4.0 GZipStream class writes the following bytes as header: byte[] headerBytes = new byte[] { 0x1f, 0x8b, 8, 0, 0, 0, 0, 0, 4, 0 }; if