FRDEventMessage.cc

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#include "IOPool/Streamer/interface/FRDEventMessage.h"
 
FRDEventMsgView::FRDEventMsgView(void* buf)
    : buf_((uint8*)buf),
      payload_(nullptr),
      size_(0),
      version_(0),
      run_(0),
      lumi_(0),
      event_(0),
      eventSize_(0),
      paddingSize_(0),
      adler32_(0),
      crc32c_(0) {
  uint32* bufPtr = static_cast<uint32*>(buf);
  version_ = *bufPtr;
  // if the version number is rather large, then we assume that the true
  // version number is one.  (In version one of the format, there was
  // no version number in the data, and the run number appeared first.)
  if (version_ >= 32) {
    version_ = 1;
  }
 
  size_ = 0;
 
  // version number
  if (version_ >= 2) {
    size_ += sizeof(uint32);
    ++bufPtr;
  }
 
  // run number
  run_ = *bufPtr;
  size_ += sizeof(uint32);
  ++bufPtr;
 
  // lumi number
  if (version_ >= 2) {
    lumi_ = *bufPtr;
    size_ += sizeof(uint32);
    ++bufPtr;
  }
 
  // event number
  if (version_ == 4) {
    uint64 eventLow = *bufPtr;
    size_ += sizeof(uint32);
    ++bufPtr;
 
    uint64 eventHigh = *bufPtr;
    size_ += sizeof(uint32);
    ++bufPtr;
 
    event_ = (eventHigh << 32) | eventLow;
 
  } else {
    event_ = *bufPtr;
    size_ += sizeof(uint32);
    ++bufPtr;
  }
 
  if (version_ >= 3) {
    // event size
    eventSize_ = *bufPtr;
    size_ += sizeof(uint32) + eventSize_;
    ++bufPtr;
 
    if (version_ >= 5) {
      crc32c_ = *bufPtr;
      size_ += sizeof(uint32);
      ++bufPtr;
    } else {
      // padding size up to V4
      paddingSize_ = *bufPtr;
      size_ += sizeof(uint32) + paddingSize_;
      ++bufPtr;
 
      adler32_ = *bufPtr;
      size_ += sizeof(uint32);
      ++bufPtr;
    }
  } else {
    for (int idx = 0; idx < 1024; idx++) {
      size_ += sizeof(uint32);  // FED N size
      size_ += *bufPtr;         // FED N data
      eventSize_ += *bufPtr;
      ++bufPtr;
    }
  }
 
  payload_ = (void*)bufPtr;
}