/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/CondFormats/Common/src/MultiFileBlob.cc

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

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

MultiFileBlob::MultiFileBlob() : 
  compressed(false), isize(0), expanded(false) {}

MultiFileBlob::~MultiFileBlob() {}

void MultiFileBlob::finalized(bool compress) {
  if (!compress) return;
  if (0==isize) return;
  compressed=true;
  expanded=false;
  std::vector<unsigned char> out(isize);
  uLongf destLen = compressBound(isize);
  int zerr =  compress2(&out.front(), &destLen,
                        &blob.front(), isize,
                        9);
    if (zerr!=0) edm::LogError("MultiFileBlob")<< "Compression error " << zerr;
    out.resize(destLen);
    blob.swap(out);
}

 
void MultiFileBlob::read(const std::string& name, std::istream & is) {
  Positions::const_iterator pos = positions.find(name);
  if (pos!=positions.end()) {
    edm::LogError("MultiFileBlob:")<< name << "already in this object";
    return;
  }
  positions[name]=isize;
  char c;
  while (is.get(c))
    blob.push_back( (unsigned char)c);
  isize=blob.size();
}

void MultiFileBlob::write(const std::string& name, std::ostream & os) const {
  Range r = rawBlob(name);
  os.write((const char *)(r.first),r.second-r.first);

}

MultiFileBlob::Range MultiFileBlob::rawBlob(const std::string& name) const {
  const_cast<MultiFileBlob*>(this)->expand();
  Positions::const_iterator pos = positions.find(name);
  if (pos==positions.end()) {
    edm::LogError("MultiFileBlob:")<< name << "not in this object";
    return Range(0,0);
  }
  unsigned long long b = (*pos).second;
  unsigned long long e = isize;
  pos++;
  if (pos!=positions.end()) e= (*pos).second;
  
  return Range(&blob[b],&blob[e]);
}


unsigned long long MultiFileBlob::size(const std::string& name) const {
  Range r = rawBlob(name);
  return r.second-r.first;
}

void MultiFileBlob::expand() {
  if (expanded) return;
  if (!compressed) {
    expanded=true;
    return;
  }
  std::vector<unsigned char> out(isize);
  uLongf destLen = out.size();
  int zerr =  uncompress(&out.front(),  &destLen,
                         &blob.front(), blob.size());
  if (zerr!=0 || out.size()!=destLen) 
    edm::LogError("FileBlob")<< "uncompressing error " << zerr
                             << " original size was " << isize
                             << " new size is " << destLen;
  blob.swap(out);
  expanded=true;
}