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// -*-c++-*-
/* $Id: cbuf.h,v 1.3 1999/11/29 19:18:18 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* 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, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#ifndef _ASYNC_CBUF_H_
#define _ASYNC_CBUF_H_ 1
#include "sysconf.h"
class cbuf {
char *buf;
size_t buflen;
bool empty;
size_t start;
size_t end;
iovec inv[2];
iovec outv[2];
public:
cbuf (size_t n)
: buf ((char *) xmalloc (n)), buflen (n), empty (true),
start (0), end (0) {}
~cbuf () { xfree (buf); }
void resize (size_t n);
void clear () { empty = false; start = end = 0; }
size_t space () const
{ return (empty || start < end ? buflen : 0) + start - end; }
const iovec *iniov ();
int iniovcnt ()
{ return empty || start < end ? 1 + !!start : start != end; }
void addbytes (size_t n);
size_t size () const
{ return (empty || start < end ? 0 : buflen) + end - start; }
char &at (size_t n) const
{ assert (n < size ()); return buf[(n + start) % buflen]; }
char &operator[] (ptrdiff_t n) const { return at (n); }
int find (char c);
const iovec *outiov ();
int outiovcnt () {
if (empty)
return 0;
if (start < end)
return 1;
else
return 1 + !!end;
}
void rembytes (size_t n) {
if (n) {
assert (n <= size ());
start = (start + n) % buflen;
empty = start == end;
}
}
void unrembytes (size_t n) {
if (n) {
assert (n >= space ());
start = (start >= n ? 0 : buflen) + start - n;
empty = false;
}
}
void copyout (void *_dst, size_t len);
private:
cbuf (const cbuf &c);
cbuf &operator= (const cbuf &c);
};
#endif /* !_ASYNC_CBUF_H_ */
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