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panda/src/downloader/httpEntityTag.cxx

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// Filename: httpEntityTag.cxx
// Created by:  drose (28Jan03)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#include "httpEntityTag.h"


////////////////////////////////////////////////////////////////////
//     Function: HTTPEntityTag::Constructor
//       Access: Published
//  Description: This constructor accepts a string as formatted from
//               an HTTP server (e.g. the tag is quoted, with an
//               optional W/ prefix.)
////////////////////////////////////////////////////////////////////
HTTPEntityTag::
HTTPEntityTag(const string &text) {
  _weak = false;

  size_t p = 0;
  if (text.length() >= 2) {
    string sub = text.substr(0, 2);
    if (sub == "W/" || sub == "w/") {
      _weak = true;
      p = 2;
    }
  }

  // Unquote the string.
  bool quoted = false;
  if (p < text.length() && text[p] == '"') {
    quoted = true;
    p++;
  }
  while (p < text.length() && !(quoted && text[p] == '"')) {
    if (text[p] == '\\') {
      p++;
    }
    _tag += text[p];
    p++;
  }
}

////////////////////////////////////////////////////////////////////
//     Function: HTTPEntityTag::get_string
//       Access: Published
//  Description: Returns the entity tag formatted for sending to an
//               HTTP server (the tag is quoted, with a conditional W/
//               prefix).
////////////////////////////////////////////////////////////////////
string HTTPEntityTag::
get_string() const {
  ostringstream result;
  if (_weak) {
    result << "W/";
  }
  result << '"';
  
  for (string::const_iterator ti = _tag.begin(); ti != _tag.end(); ++ti) {
    switch (*ti) {
    case '"':
    case '\\':
      result << '\\';
      // fall through

    default:
      result << (*ti);
    }
  }

  result << '"';

  return result.str();
}

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