C++压缩解压之snappy

引文出处：http://wiki.dreamrunner.org/public_html/C-C++/Library-Notes/Snappy.html

Snappy

Table of Contents

Overview

• homepage: http://google.github.io/snappy/
• git: https://github.com/google/snappy

Snappy is a compression/decompression library. It does not aim for maximum compression, or compatibility with any other compression library; instead, it aims for very high speeds and reasonable compression

• Fast: Compression speeds at 250 MB/sec and beyond, with no assembler code. See "Performance" below.
• Stable: Over the last few years, Snappy has compressed and decompressed petabytes of data in Google's production environment. The Snappy bitstream format is stable and will not change between versions.
• Robust: The Snappy decompressor is designed not to crash in the face of corrupted or malicious input.

Compile and install

./autogen.sh
./configure
make
# to static library
ar rcs libsnappy.a ./*.o

Use

To use Snappy from your own C++ program, include the file "snappy.h" from your calling file, and link against the compiled library.

There are many ways to call Snappy, but the simplest possible is

snappy::Compress(input.data(), input.size(), &output);
snappy::Uncompress(input.data(), input.size(), &output);

where "input" and "output" are both instances of std::string.

Example

#include 
#include 
#include 
using namespace std;

int main() {
  string input = "Hello World";
  string output;
  for (int i = 0; i < 5; ++i) {
    input += input;
  }
  snappy::Compress(input.data(), input.size(), &output);
  cout << "input size:" << input.size() << " output size:"
       << output.size() << endl;
  string output_uncom;
  snappy::Uncompress(output.data(), output.size(), &output_uncom);
  if (input == output_uncom) {
    cout << "Equal" << endl;
  } else {
    cout << "ERROR: not equal" << endl;
  }
  return 0;
}

$ g++ -o example ./snappy-example.cc -I. -L. -lsnappy
$ ./example 
input size:352 output size:32
Equal

Author: Shi Shougang

Created: 2016-03-13 Sun 22:15

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