FileBlob.cc

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#include "CondFormats/Common/interface/FileBlob.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include <iostream>
#include <fstream>
#include <string>
#include <zlib.h>

FileBlob::FileBlob(const std::string& fname, bool zip) : isize(0) {
  compressed = zip;
  /*  
  std::cout << "isize = " << isize 
        << "  zip = " << (zip? "true" : "false")
        << std::endl;
  */
  if (isize == 0)
    isize = computeFileSize(fname);
  // std::cout << "isize = " << isize << std::endl;
  blob.reserve(isize);
  read(fname);
}
FileBlob::FileBlob(std::istream& is, bool zip) : isize(0) {
  compressed = zip;
  if (isize == 0)
    isize = computeStreamSize(is);
  blob.reserve(isize);
  read(is);
}

void FileBlob::read(std::istream& is) {
  if (compressed) {
    std::vector<unsigned char> in;
    in.reserve(isize);
    char c;
    while (is.get(c))
      in.push_back((unsigned char)c);
    /*
    for(int i=0;i<in.size();i++){
      std::cout<<in[i];
    }
    std::cout<<std::endl;
    */
    blob.resize(isize);
    uLongf destLen = compressBound(in.size());
    int zerr = compress2(&*blob.begin(), &destLen, &*in.begin(), in.size(), 9);
    if (zerr != 0)
      edm::LogError("FileBlob") << "Compression error " << zerr;
    blob.resize(destLen);
  } else {
    //std::cout << "reading uncompressed" << std::endl;
    char c;
    while (is.get(c))
      blob.push_back((unsigned char)c);
    blob.resize(blob.size());
    isize = blob.size();
  }
}

void FileBlob::write(std::ostream& os) const {
  if (compressed) {
    std::vector<unsigned char> out(isize);
    uLongf destLen = out.size();
    int zerr = uncompress(&*out.begin(), &destLen, &*blob.begin(), blob.size());
    if (zerr != 0 || out.size() != destLen)
      edm::LogError("FileBlob") << "uncompressing error " << zerr << " original size was " << isize << " new size is "
                                << destLen;
    os.write(reinterpret_cast<const char*>(&*out.begin()), out.size());
  } else {
    os.write(reinterpret_cast<const char*>(&*blob.begin()), blob.size());
  }
}

std::unique_ptr<std::vector<unsigned char> > FileBlob::getUncompressedBlob() const {
  std::unique_ptr<std::vector<unsigned char> > newblob;
  if (compressed) {
    newblob.reset(new std::vector<unsigned char>(isize));
    uLongf destLen = newblob->size();
    //    std::cout<<"Store isize = "<<isize<<"; newblob->size() = "<<newblob->size()<<"; destLen = "<<destLen<<std::endl;
    int zerr = uncompress(&*(newblob->begin()), &destLen, &*blob.begin(), blob.size());
    if (zerr != 0 || newblob->size() != destLen)
      edm::LogError("FileBlob") << "uncompressing error " << zerr << " original size was " << isize << " new size is "
                                << destLen;
  } else {
    newblob.reset(new std::vector<unsigned char>(blob));
  }
  return newblob;
}

void FileBlob::getUncompressedBlob(std::vector<unsigned char>& myblobcopy) const {
  if (compressed) {
    myblobcopy.reserve(isize);
    uLongf destLen = isize;
    int zerr = uncompress(&*myblobcopy.begin(), &destLen, &*blob.begin(), blob.size());
    if (zerr != 0 || myblobcopy.size() != destLen)
      edm::LogError("FileBlob") << "uncompressing error " << zerr << " original size was " << isize << " new size is "
                                << destLen;
  } else {
    myblobcopy = blob;
  }
}

void FileBlob::read(const std::string& fname) {
  std::ifstream ifile(fname.c_str());
  if (!ifile) {
    edm::LogError("FileBlob") << "file " << fname << " does not exist...";
  } else
    read(ifile);
  ifile.close();
}

void FileBlob::write(const std::string& fname) const {
  std::ofstream ofile(fname.c_str());
  write(ofile);
  ofile.close();
}

unsigned int FileBlob::computeFileSize(const std::string& fname) {
  unsigned int is = 0;
  std::ifstream ifile(fname.c_str());
  if (!ifile) {
    edm::LogError("FileBlob") << "file " << fname << " does not exist...";
  } else
    is = computeStreamSize(ifile);
  ifile.close();
  return is;
}

unsigned int FileBlob::computeStreamSize(std::istream& is) {
  unsigned int rs = 0;
  char c;
  while (is.get(c))
    rs++;
  is.clear();
  is.seekg(0);
  return rs;
}