bzip2

I have about 200,000 text files that are placed in a bz2 file. The issue I have is that when I scan the bz2 file to extract the data I need, it goes extremely slow. It has to look through the entire bz2 file to fine the single file I am looking for. Is there anyway to speed this up? Also, I thought about possibly organizing the files in the tar.bz2 so I can instead have it know where to look. Is there anyway to organize files that are put into a bz2? More Info/Edit: I need to query the compressed file for each textfile. Is there a better compression method that supports such a large number of

I am a new-grad SWE learning Go (and loving it). I am building a parser for Wikipedia dump files - basically a huge bzip2-compressed XML file (~50GB uncompressed). I want to do both streaming decompression and parsing, which sounds simple enough. For decompression, I do: inputFilePath := flag.Arg(0) inputReader := bzip2.NewReader(inputFile) And then pass the reader to the XML parser: decoder := xml.NewDecoder(inputFile) However, since both decompressing and parsing are expensive operations, I would like to have them run on separate Go routines to make use of additional cores. How would I go

The Question I am parsing large compressed files in Python 2.7.6 and would like to know the uncompressed file size before starting. I am trying to use the second technique presented in this SO answer . It works for bzip2 formatted files but not gzip formatted files. What is different about the two compression algorithms that causes this? Example Code This code snipped demonstrates the behavior, assuming you have "test.bz2" and "test.gz" present in your current working directory: import os import bz2 import gzip bz = bz2.BZ2File('test.bz2', mode='r') bz.seek(0, os.SEEK_END) bz.close() gz = gzip

I currently need some help learning how to use bzlib.h header. I was wondering if anyone would be as so kind to help me figure out a compressToBZ2() function in C++ without using any Boost libraries? void compressBZ2(std::string file) { std::ifstream infile; int fileDestination = infile.open(file.c_str()); char bz2Filename[] = "file.bz2"; FILE *bz2File = fopen(bz2Filename, "wb"); int bzError; const int BLOCK_MULTIPLIER = 7; BZFILE *myBZ = BZ2_bzWriteOpen(&bzError, bz2File, BLOCK_MULTIPLIER, 0, 0); const int BUF_SIZE = 10000; char* buf = new char[BUF_SIZE]; ssize_t bytesRead; while ((bytesRead

Are there any javascript libraries that can take a byte array and bz2 decompress it into another byte array? I know that many browsers have this capability for an entire stream, but this array is at an offset from the start of the stream. Yes. Here's ont for byte array: https://github.com/antimatter15/bzip2.js And for binary strings: https://github.com/kirilloid/bzip2-js 来源： https://stackoverflow.com/questions/9434613/bz2-in-javascript

I am trying to use the bz2 and/or lzma packages in python. I am trying to compress a database dump in csv format and then put it to a zip file. I got it to work with one-shot compression with both the packages. Code for which looks like this: with ZipFile('something.zip', 'w') as zf: content = bz2.compress(bytes(csv_string, 'UTF-8')) # also with lzma zf.writestr( 'something.csv' + '.bz2', content, compress_type=ZIP_DEFLATED ) When I try to use incremental compression then it creates a .zip file which when I try to extract keeps giving some archive file recursively. Code for which looks like

This is the question about bzip2 archive format . Any Bzip2 archive consists of file header, one or more blocks and tail structure. All blocks should start with "1AY&SY", 6 bytes of BCD-encoded digits of the Pi number, 0x314159265359. According to the source of bzip2 : /*-- A 6-byte block header, the value chosen arbitrarily as 0x314159265359 :-). A 32 bit value does not really give a strong enough guarantee that the value will not appear by chance in the compressed datastream. Worst-case probability of this event, for a 900k block, is about 2.0e-3 for 32 bits, 1.0e-5 for 40 bits and 4.0e-8