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/* Copyright (C) 2005 J.F.Dockes
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "autoconfig.h"
#include <stdlib.h>
#include <ctype.h>
#include <cstring>
#include <fstream>
#include <sstream>
#include "idfile.h"
#include "log.h"
#include "smallut.h"
using namespace std;
// Bogus code to avoid bogus valgrind mt warnings about the
// initialization of treat_mbox_... which I can't even remember the
// use of (it's not documented or ever set)
static int treat_mbox_as_rfc822;
class InitTMAR {
public:
InitTMAR() {
treat_mbox_as_rfc822 = getenv("RECOLL_TREAT_MBOX_AS_RFC822") ? 1 : -1;
}
};
static InitTMAR initTM;
/**
* This code is currently ONLY used to identify mbox and mail message files
* which are badly handled by standard mime type identifiers
* There is a very old (circa 1990) mbox format using blocks of ^A (0x01) chars
* to separate messages, that we don't recognize currently
*/
// Mail headers we compare to:
static const char *mailhs[] = {"From: ", "Received: ", "Message-Id: ", "To: ",
"Date: ", "Subject: ", "Status: ", "In-Reply-To: "};
static const int mailhsl[] = {6, 10, 12, 4, 6, 9, 8, 13};
static const int nmh = sizeof(mailhs) / sizeof(char *);
const int wantnhead = 3;
// fn is for message printing
static string idFileInternal(istream& input, const char *fn)
{
bool line1HasFrom = false;
bool gotnonempty = false;
int lookslikemail = 0;
// emacs VM sometimes inserts very long lines with continuations or
// not (for folder information). This forces us to look at many
// lines and long ones
int lnum = 1;
for (int loop = 1; loop < 200; loop++, lnum++) {
#define LL 2*1024
char cline[LL+1];
cline[LL] = 0;
input.getline(cline, LL-1);
if (input.fail()) {
if (input.bad()) {
LOGERR("idfile: error while reading [" << (fn) << "]\n");
return string();
}
// Must be eof ?
break;
}
// gcount includes the \n
std::streamsize ll = input.gcount() - 1;
if (ll > 0)
gotnonempty = true;
LOGDEB2("idfile: lnum " << lnum << " ll " << ll << ": [" << cline << "]\n");
// Check for a few things that can't be found in a mail file,
// (optimization to get a quick negative)
// Empty lines
if (ll <= 0) {
// Accept a few empty lines at the beginning of the file,
// otherwise this is the end of headers
if (gotnonempty || lnum > 10) {
LOGDEB2("Got empty line\n");
break;
} else {
// Don't increment the line counter for initial empty lines.
lnum--;
continue;
}
}
// emacs vm can insert VERY long header lines.
if (ll > LL - 20) {
LOGDEB2("idFile: Line too long\n");
return string();
}
// Check for mbox 'From ' line
if (lnum == 1 && !strncmp("From ", cline, 5)) {
if (treat_mbox_as_rfc822 == -1) {
line1HasFrom = true;
LOGDEB2("idfile: line 1 has From_\n");
}
continue;
}
// Except for a possible first line with 'From ', lines must
// begin with whitespace or have a colon
// (hope no one comes up with a longer header name !
// Take care to convert to unsigned char because ms ctype does
// like negative values
if (!isspace((unsigned char)cline[0])) {
char *cp = strchr(cline, ':');
if (nullptr == cp || (cp - cline) > 70) {
LOGDEB2("idfile: can't be mail header line: [" << (cline) << "]\n");
break;
}
}
// Compare to known headers
for (int i = 0; i < nmh; i++) {
if (!strncasecmp(mailhs[i], cline, mailhsl[i])) {
//fprintf(stderr, "Got [%s]\n", mailhs[i]);
lookslikemail++;
break;
}
}
if (lookslikemail >= wantnhead)
break;
}
if (line1HasFrom)
lookslikemail++;
if (lookslikemail >= wantnhead)
return line1HasFrom ? string("text/x-mail") : string("message/rfc822");
return string();
}
string idFile(const char *fn)
{
ifstream input;
input.open(fn, ios::in);
if (!input.is_open()) {
LOGERR("idFile: could not open [" << fn << "]\n");
return string();
}
return idFileInternal(input, fn);
}
string idFileMem(const string& data)
{
stringstream s(data, stringstream::in);
return idFileInternal(s, "");
}
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