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/*************************************************************************
*
* HTCd - Copyright (C) 1998-2006 Henrik Rydberg
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef FILEMAPH
#define FILEMAPH
#include <mt/mstring.h>
#include <mt/lock.h>
#include <mt/mlock.h>
#include <mt/mlock.h>
#include <netinet/in.h>
//////////////////////////////////////////////
//
// NOTE that filemap is MT unsafe:
// it needs to be called from dbmap
//
// The exception is when filelocking;
// that's MT safe per filemap, and hence
// should not be locked further
//
#define HEADLOCK(fm) headlock_t headlock(fm)
//////////////////////////////////////////////////////
// network byteorder
class byte4 {
public:
byte4() {} // must be uninitialized
explicit byte4(int h): n(htonl(h)) {}
void set(int h) { n=htonl(h); }
void add(int h) { n=htonl(ntohl(n)+h); }
int get() const { return ntohl(n); }
private:
long n;
};
//////////////////////////////////////////////////////
class filemap {
public:
typedef char char32[32];
static const int maxtabs=32;
////////////////////////////////////////////////////
struct head_t {
char32 ident;
byte4 lock;
byte4 minor;
byte4 major;
byte4 fatal;
byte4 filesize;
byte4 filetop;
byte4 tables;
byte4 index;
char32 compname;
char32 tabs[maxtabs];
byte4 frame;
head_t();
head_t(const head_t* hd,int mem);
void setcomp(int idx, const sref& cp);
sref get(int col) const { return sref(tabs[col]); }
void set(int col,const sref& s);
void insert(int col,const sref& s);
void remove(int col);
};
head_t* head() { return hd; }
const head_t* head() const { return hd; }
///////////////////////////////////////////////////////
struct rec_t {
byte4 mem;
byte4 caps;
};
rec_t* at(int off) {
for(chunk_t* p=mem;p;p=p->next) if(p->own(off)) return p->at(off); return 0;
}
const rec_t* at(int off) const {
for(const chunk_t* p=mem;p;p=p->next) if(p->own(off)) return p->at(off);
return 0;
}
int recs() const { return hd->frame.get(); }
int size(int off) const {
if(off<hd->filetop.get()) {
for(const chunk_t* p=mem;p;p=p->next)
if(p->own(off)) return p->at(off)->mem.get();
}
return 0;
}
///////////////////////////////////////////////////////
void remap();
rec_t* add(int n);
void rem(rec_t* rec);
///////////////////////////////////////////////////////
filemap(filemap* p);
filemap(filemap* p,const mstring& path,int update=0,int prot=0600);
~filemap();
filemap* next;
///////////////////////////////////////////////////////
void open(const mstring& path,int update=0,int prot=0600) throw(merror_t);
void save(const mstring& path,int prot=0600) throw(merror_t);
void check() throw(merror_t);
void close();
void sync();
const mstring& Pathname() const { return pathname; }
time_t Lastmod() const;
int reference() const { return refs; }
int writable() const { return wok; }
void pushref() { refs++; }
void popref() { refs--; }
///////////////////////////////////////////////////////
void lock();
void unlock();
///////////////////////////////////////////////////////
protected:
struct chunk_t {
chunk_t* next;
long begin;
long end;
char* map;
int size() const { return end-begin; }
chunk_t(chunk_t* p,int fd,int wok,int off,int size);
~chunk_t();
int own(int off) const { return off>=begin&&off<end; }
void sync();
rec_t* at(int off) { return (rec_t*)(map+(off-begin)); }
const rec_t* at(int off) const { return (rec_t*)(map+(off-begin)); }
int fill(int off);
};
private:
int fd,wok,refs;
mstring pathname;
head_t* hd;
chunk_t* mem;
mutex_t mutex;
nodelock_t* nodelock;
private:
filemap(const filemap&) {}
void operator=(const filemap&) {}
};
//////////////////////////////////////////////////////
struct headlock_t {
filemap* fm;
headlock_t(filemap* f) : fm(f) { fm->lock(); }
~headlock_t() { if(fm) fm->unlock(); }
};
#endif
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