C++ ArchiveMember::isSVR4SymbolTable方法代码示例

// Fill the ArchiveMemberHeader with the information from a member. If
// TruncateNames is true, names are flattened to 15 chars or less. The sz field
// is provided here instead of coming from the mbr because the member might be
// stored compressed and the compressed size is not the ArchiveMember's size.
// Furthermore compressed files have negative size fields to identify them as
// compressed.
bool
Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr,
                    int sz) const {

  // Set the permissions mode, uid and gid
  hdr.init();
  char buffer[32];
  sprintf(buffer, "%-8o", mbr.getMode());
  memcpy(hdr.mode,buffer,8);
  sprintf(buffer,  "%-6u", mbr.getUser());
  memcpy(hdr.uid,buffer,6);
  sprintf(buffer,  "%-6u", mbr.getGroup());
  memcpy(hdr.gid,buffer,6);

  // Set the last modification date
  uint64_t secondsSinceEpoch = mbr.getModTime().toEpochTime();
  sprintf(buffer,"%-12u", unsigned(secondsSinceEpoch));
  memcpy(hdr.date,buffer,12);

  std::string mbrPath = sys::path::filename(mbr.getPath());

  // Set the name field in one of its various flavors.
  bool writeLongName = false;
  if (mbr.isStringTable()) {
    memcpy(hdr.name,ARFILE_STRTAB_NAME,16);
  } else if (mbr.isSVR4SymbolTable()) {
    memcpy(hdr.name,ARFILE_SVR4_SYMTAB_NAME,16);
  } else if (mbr.isBSD4SymbolTable()) {
    memcpy(hdr.name,ARFILE_BSD4_SYMTAB_NAME,16);
  } else if (mbrPath.length() < 16 && mbrPath.find('/') == std::string::npos) {
    memcpy(hdr.name,mbrPath.c_str(),mbrPath.length());
    hdr.name[mbrPath.length()] = '/';
  } else {
    std::string nm = "#1/";
    nm += utostr(mbrPath.length());
    memcpy(hdr.name,nm.data(),nm.length());
    if (sz < 0)
      sz -= mbrPath.length();
    else
      sz += mbrPath.length();
    writeLongName = true;
  }

  // Set the size field
  if (sz < 0) {
    buffer[0] = '-';
    sprintf(&buffer[1],"%-9u",(unsigned)-sz);
  } else {
    sprintf(buffer, "%-10u", (unsigned)sz);
  }
  memcpy(hdr.size,buffer,10);

  return writeLongName;
}

// This function loads the entire archive and fully populates its ilist with
// the members of the archive file. This is typically used in preparation for
// editing the contents of the archive.
bool
Archive::loadArchive(std::string* error) {

  // Set up parsing
  members.clear();
  const char *At = base;
  const char *End = mapfile->getBufferEnd();

  if (!checkSignature(error))
    return false;

  At += 8;  // Skip the magic string.

  bool foundFirstFile = false;
  while (At < End) {
    // parse the member header
    const char* Save = At;
    ArchiveMember* mbr = parseMemberHeader(At, End, error);
    if (!mbr)
      return false;

    // check if this is the foreign symbol table
    if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
    } else if (mbr->isStringTable()) {
      // Simply suck the entire string table into a string
      // variable. This will be used to get the names of the
      // members that use the "/ddd" format for their names
      // (SVR4 style long names).
      strtab.assign(At, mbr->getSize());
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
      delete mbr;
    } else {
      // This is just a regular file. If its the first one, save its offset.
      // Otherwise just push it on the list and move on to the next file.
      if (!foundFirstFile) {
        firstFileOffset = Save - base;
        foundFirstFile = true;
      }
      members.push_back(mbr);
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
    }
  }
  return true;
}

// Load just the symbol table from the archive file
bool
Archive::loadSymbolTable(std::string* ErrorMsg) {

  // Set up parsing
  members.clear();
  const char *At = base;
  const char *End = mapfile->getBufferEnd();

  // Make sure we're dealing with an archive
  if (!checkSignature(ErrorMsg))
    return false;

  At += 8; // Skip signature

  // Parse the first file member header
  const char* FirstFile = At;
  ArchiveMember* mbr = parseMemberHeader(At, End, ErrorMsg);
  if (!mbr)
    return false;

  if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
    // Skip the foreign symbol table, we don't do anything with it
    At += mbr->getSize();
    if ((intptr_t(At) & 1) == 1)
      At++;
    delete mbr;

    // Read the next one
    FirstFile = At;
    mbr = parseMemberHeader(At, End, ErrorMsg);
    if (!mbr) {
      delete mbr;
      return false;
    }
  }

  if (mbr->isStringTable()) {
    // Process the string table entry
    strtab.assign((const char*)mbr->getData(), mbr->getSize());
    At += mbr->getSize();
    if ((intptr_t(At) & 1) == 1)
      At++;
    delete mbr;
    // Get the next one
    FirstFile = At;
    mbr = parseMemberHeader(At, End, ErrorMsg);
    if (!mbr) {
      delete mbr;
      return false;
    }
  }

  // There's no symbol table in the file. We have to rebuild it from scratch
  // because the intent of this method is to get the symbol table loaded so
  // it can be searched efficiently.
  // Add the member to the members list
  members.push_back(mbr);

  firstFileOffset = FirstFile - base;
  return true;
}

// Fill the ArchiveMemberHeader with the information from a member. If
// TruncateNames is true, names are flattened to 15 chars or less. The sz field
// is provided here instead of coming from the mbr because the member might be
// stored compressed and the compressed size is not the ArchiveMember's size.
// Furthermore compressed files have negative size fields to identify them as
// compressed.
bool
Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr,
                    int sz, bool TruncateNames) const {

  // Set the permissions mode, uid and gid
  hdr.init();
  char buffer[32];
  sprintf(buffer, "%-8o", mbr.getMode());
  memcpy(hdr.mode,buffer,8);
  sprintf(buffer,  "%-6u", mbr.getUser());
  memcpy(hdr.uid,buffer,6);
  sprintf(buffer,  "%-6u", mbr.getGroup());
  memcpy(hdr.gid,buffer,6);

  // Set the last modification date
  uint64_t secondsSinceEpoch = mbr.getModTime().toEpochTime();
  sprintf(buffer,"%-12u", unsigned(secondsSinceEpoch));
  memcpy(hdr.date,buffer,12);

  // Get rid of trailing blanks in the name
  std::string mbrPath = mbr.getPath().str();
  size_t mbrLen = mbrPath.length();
  while (mbrLen > 0 && mbrPath[mbrLen-1] == ' ') {
    mbrPath.erase(mbrLen-1,1);
    mbrLen--;
  }

  // Set the name field in one of its various flavors.
  bool writeLongName = false;
  if (mbr.isStringTable()) {
    memcpy(hdr.name,ARFILE_STRTAB_NAME,16);
  } else if (mbr.isSVR4SymbolTable()) {
    memcpy(hdr.name,ARFILE_SVR4_SYMTAB_NAME,16);
  } else if (mbr.isBSD4SymbolTable()) {
    memcpy(hdr.name,ARFILE_BSD4_SYMTAB_NAME,16);
  } else if (mbr.isLLVMSymbolTable()) {
    memcpy(hdr.name,ARFILE_LLVM_SYMTAB_NAME,16);
  } else if (TruncateNames) {
    const char* nm = mbrPath.c_str();
    unsigned len = mbrPath.length();
    size_t slashpos = mbrPath.rfind('/');
    if (slashpos != std::string::npos) {
      nm += slashpos + 1;
      len -= slashpos +1;
    }
    if (len > 15)
      len = 15;
    memcpy(hdr.name,nm,len);
    hdr.name[len] = '/';
  } else if (mbrPath.length() < 16 && mbrPath.find('/') == std::string::npos) {
    memcpy(hdr.name,mbrPath.c_str(),mbrPath.length());
    hdr.name[mbrPath.length()] = '/';
  } else {
    std::string nm = "#1/";
    nm += utostr(mbrPath.length());
    memcpy(hdr.name,nm.data(),nm.length());
    if (sz < 0)
      sz -= mbrPath.length();
    else
      sz += mbrPath.length();
    writeLongName = true;
  }

  // Set the size field
  if (sz < 0) {
    buffer[0] = '-';
    sprintf(&buffer[1],"%-9u",(unsigned)-sz);
  } else {
    sprintf(buffer, "%-10u", (unsigned)sz);
  }
  memcpy(hdr.size,buffer,10);

  return writeLongName;
}

// This function loads the entire archive and fully populates its ilist with
// the members of the archive file. This is typically used in preparation for
// editing the contents of the archive.
bool
Archive::loadArchive(std::string* error) {

  // Set up parsing
  members.clear();
  symTab.clear();
  const char *At = base;
  const char *End = mapfile->getBufferEnd();

  if (!checkSignature(error))
    return false;

  At += 8;  // Skip the magic string.

  bool seenSymbolTable = false;
  bool foundFirstFile = false;
  while (At < End) {
    // parse the member header
    const char* Save = At;
    ArchiveMember* mbr = parseMemberHeader(At, End, error);
    if (!mbr)
      return false;

    // check if this is the foreign symbol table
    if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
      // We just save this but don't do anything special
      // with it. It doesn't count as the "first file".
      if (foreignST) {
        // What? Multiple foreign symbol tables? Just chuck it
        // and retain the last one found.
        delete foreignST;
      }
      foreignST = mbr;
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
    } else if (mbr->isStringTable()) {
      // Simply suck the entire string table into a string
      // variable. This will be used to get the names of the
      // members that use the "/ddd" format for their names
      // (SVR4 style long names).
      strtab.assign(At, mbr->getSize());
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
      delete mbr;
    } else if (mbr->isLLVMSymbolTable()) {
      // This is the LLVM symbol table for the archive. If we've seen it
      // already, its an error. Otherwise, parse the symbol table and move on.
      if (seenSymbolTable) {
        if (error)
          *error = "invalid archive: multiple symbol tables";
        return false;
      }
      if (!parseSymbolTable(mbr->getData(), mbr->getSize(), error))
        return false;
      seenSymbolTable = true;
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
      delete mbr; // We don't need this member in the list of members.
    } else {
      // This is just a regular file. If its the first one, save its offset.
      // Otherwise just push it on the list and move on to the next file.
      if (!foundFirstFile) {
        firstFileOffset = Save - base;
        foundFirstFile = true;
      }
      members.push_back(mbr);
      At += mbr->getSize();
      if ((intptr_t(At) & 1) == 1)
        At++;
    }
  }
  return true;
}