解压缩bzip2字节数组

Question

如何使用boost解压缩bzip2压缩的字节数组？我在这里找到了一个例子,但输入是一个文件,因此使用ifstream.文档对我来说不是很清楚:(.

编辑:我会接受提升的替代方案.

Answer 1

这是我在boost.iostreams库中使用DEFLATE压缩的代码; 我相信你可以挂钩相应的BZip2压缩器:

#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include <boost/iostreams/filter/bzip2.hpp>   // <--- this one for you
#include <boost/iostreams/write.hpp>

  // Output

  std::ofstream datfile(filename, std::ios::binary);
  boost::iostreams::filtering_ostreambuf zdat;
  zdat.push(boost::iostreams::zlib_compressor());  // your compressor here
  zdat.push(datfile);

  boost::iostreams::write(zdat, BUFFER, BUFFER_SIZE);

  // Input

  std::ifstream datfile(filename, std::ios::binary);
  boost::iostreams::filtering_istreambuf zdat;
  zdat.push(boost::iostreams::zlib_decompressor());
  zdat.push(datfile);

  boost::iostreams::read(zdat, BUFFER, BUFFER_SIZE);

调用bzip2压缩器bzip2_(de)compressor().

如果您需要字节缓冲区而不是文件,请使用字符串流:

char mydata[N];
std::string mydatastr(mydata, N);
std::istringstream iss(mydatastr, std::ios::binary);
std::ostringstream oss(mydatastr, std::ios::binary);