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/* $Id: MessageId.cpp,v 1.8 2004/08/19 23:52:51 terpstra Exp $
*
* MessageId.cpp - Helper class for manipulating internal message ids
*
* Copyright (C) 2002 - Wesley W. Terpstra
*
* License: GPL
*
* Authors: 'Wesley W. Terpstra' <wesley@terpstra.ca>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _XOPEN_SOURCE 500
#define _FILE_OFFSET_BITS 64
#include "MessageId.h"
#include <cstring>
#include <cstdio>
#include <cstdlib>
inline int dehex(char x)
{
if (x >= 'a' && x <= 'f') return x - 'a' + 10;
if (x >= 'A' && x <= 'F') return x - 'A' + 10;
return x - '0';
}
time_t my_timegm(struct tm* tm)
{
static bool initd = false;
static time_t delta;
if (!initd)
{ // use 'x' to calculate local time zone offset portably
time_t x = time(0);
time_t y = mktime(gmtime(&x));
delta = x - y;
initd = true;
}
struct tm hack = *tm;
hack.tm_sec += delta;
return mktime(&hack);
}
const unsigned int MessageId::time_len = 15;
const unsigned int MessageId::full_len = 24;
const unsigned int MessageId::raw_len = 8;
/** Note; the serialized time is always in UTC!
*
* This is so that the same message will have the same lurker id across
* all servers with the message, regardless of their timezone.
*/
MessageId::MessageId(const char* str)
{
if (strlen(str) > 14 && str[8] == '.')
{
struct tm t;
memset(&t, 0, sizeof(t));
t.tm_year = (str[ 0] - '0') * 1000 +
(str[ 1] - '0') * 100 +
(str[ 2] - '0') * 10 +
(str[ 3] - '0')
- 1900;
t.tm_mon = (str[ 4] - '0') * 10 +
(str[ 5] - '0')
- 1;
t.tm_mday = (str[ 6] - '0') * 10 +
(str[ 7] - '0');
t.tm_hour = (str[ 9] - '0') * 10 +
(str[10] - '0');
t.tm_min = (str[11] - '0') * 10 +
(str[12] - '0');
t.tm_sec = (str[13] - '0') * 10 +
(str[14] - '0');
time_t tm = my_timegm(&t);
time_[3] = (tm & 0xFF); tm >>= 8;
time_[2] = (tm & 0xFF); tm >>= 8;
time_[1] = (tm & 0xFF); tm >>= 8;
time_[0] = (tm & 0xFF);
}
else
{
time_[0] = time_[1] = time_[2] = time_[3] = 0;
}
if (strlen(str) > 23 && str[15] == '.')
{
hash_[0] = dehex(str[16]) * 16 + dehex(str[17]);
hash_[1] = dehex(str[18]) * 16 + dehex(str[19]);
hash_[2] = dehex(str[20]) * 16 + dehex(str[21]);
hash_[3] = dehex(str[22]) * 16 + dehex(str[23]);
}
else
{
hash_[0] = hash_[1] = hash_[2] = hash_[3] = 0;
}
}
string MessageId::serialize() const
{
char buf[26];
time_t then = timestamp();
strftime(buf, 25, "%Y%m%d.%H%M%S", gmtime(&then));
snprintf(&buf[15], 10, ".%02x%02x%02x%02x",
hash_[0], hash_[1], hash_[2], hash_[3]);
return buf;
}
static inline bool is_digit(char c)
{
return (c >= '0' && c <= '9');
}
static inline bool is_hex(char c)
{
return (c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F');
}
bool MessageId::is_time(const char* s)
{
return is_digit(s[0]) && is_digit(s[1]) &&
is_digit(s[2]) && is_digit(s[3]) &&
is_digit(s[4]) && is_digit(s[5]) &&
is_digit(s[6]) && is_digit(s[7]) &&
s[8] == '.' &&
is_digit(s[ 9]) && is_digit(s[10]) &&
is_digit(s[11]) && is_digit(s[12]) &&
is_digit(s[13]) && is_digit(s[14]);
}
bool MessageId::is_full(const char* s)
{
return is_time(s) &&
s[15] == '.' &&
is_hex(s[16]) && is_hex(s[17]) &&
is_hex(s[18]) && is_hex(s[19]) &&
is_hex(s[20]) && is_hex(s[21]) &&
is_hex(s[22]) && is_hex(s[23]);
}
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