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/*
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
*/
#ifndef SQUID_STMEM_H
#define SQUID_STMEM_H
#include "splay.h"
#include "Range.h"
class mem_node;
class StoreIOBuffer;
class mem_hdr
{
public:
mem_hdr();
~mem_hdr();
void freeContent();
int64_t lowestOffset () const;
int64_t endOffset () const;
int64_t freeDataUpto (int64_t);
ssize_t copy (StoreIOBuffer const &) const;
bool hasContigousContentRange(Range<int64_t> const &range) const;
/* success or fail */
bool write (StoreIOBuffer const &);
void dump() const;
size_t size() const;
/* Not an iterator - thus the start, not begin() */
mem_node const *start() const;
mem_node *getBlockContainingLocation (int64_t location) const;
/* access the contained nodes - easier than punning
* as a contianer ourselves
*/
const Splay<mem_node *> &getNodes() const;
char * NodeGet(mem_node * aNode);
/* Only for use of MemObject */
void internalAppend(const char *data, int len);
static SplayNode<mem_node *>::SPLAYCMP NodeCompare;
private:
void debugDump() const;
bool unlink(mem_node *aNode);
void makeAppendSpace();
int appendToNode(mem_node *aNode, const char *data, int maxLength);
void appendNode (mem_node *aNode);
size_t copyAvailable(mem_node *aNode, int64_t location, size_t amount, char *target) const;
bool unionNotEmpty (StoreIOBuffer const &);
mem_node *nodeToRecieve(int64_t offset);
size_t writeAvailable(mem_node *aNode, int64_t location, size_t amount, char const *source);
int64_t inmem_hi;
Splay<mem_node *> nodes;
};
#endif /* SQUID_STMEM_H */
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