xapian-applications/omega/values.h

   1 /* values.h: constants and functions for document value handling.
   2  *
   3  * Copyright (C) 2006,2010,2015 Olly Betts
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #ifndef OMEGA_INCLUDED_VALUES_H
  21 #define OMEGA_INCLUDED_VALUES_H
  22
  23 #include <cstring>
  24 #include <string>
  25
  26 #include <cstdint>
  27 using std::uint32_t;
  28
  29 // Include these to get htonl, etc.
  30 #ifdef HAVE_ARPA_INET_H
  31 # include <arpa/inet.h>
  32 #endif
  33 #ifdef HAVE_NETINET_IN_H
  34 # include <netinet/in.h>
  35 #endif
  36 #ifdef __WIN32__
  37 inline uint32_t htonl(uint32_t v) {
  38     return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
  39 }
  40 # define ntohl(V) htonl(V)
  41 #endif
  42
  43 enum value_slot {
  44     VALUE_LASTMOD = 0,  // 4 byte big endian value - seconds since 1970.
  45     VALUE_MD5 = 1,      // 16 byte MD5 checksum of original document.
  46     VALUE_SIZE = 2,     // sortable_serialise(<file size in bytes>).
  47     VALUE_CTIME = 3     // Like VALUE_LASTMOD, but for last metadata change.
  48 };
  49
  50 inline uint32_t binary_string_to_int(const std::string &s)
  51 {
  52     if (s.size() != 4) return static_cast<uint32_t>(-1);
  53     uint32_t v;
  54     std::memcpy(&v, s.data(), 4);
  55     return ntohl(v);
  56 }
  57
  58 inline std::string int_to_binary_string(uint32_t v)
  59 {
  60     v = htonl(v);
  61     return std::string(reinterpret_cast<const char*>(&v), 4);
  62 }
  63
  64 #endif