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/* |
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* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
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* |
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* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
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* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team |
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* Copyright (©) 1992,2007 Frank Tore Johansen |
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* |
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* Crossfire TRT is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the Free |
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* Software Foundation; either version 2 of the License, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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* The authors can be reached via e-mail to <crossfire@schmorp.de> |
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*/ |
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#ifndef DYNBUF_H__ |
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#define DYNBUF_H__ |
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#include <cstring> |
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#include <cassert> |
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#include "util.h" |
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#include "shstr.h" |
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// this is a "buffer" that can grow fast |
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// and is still somewhat space-efficient. |
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// unlike obstacks or other data structures, |
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// it never moves data around. basically, |
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// this is a fast strstream without the overhead. |
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1.4 |
struct dynbuf |
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{ |
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protected: |
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struct chunk |
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{ |
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chunk *next; |
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int alloc; |
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int size; |
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char data[0]; |
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}; |
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char *ptr, *end; |
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int ext; |
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int _size; |
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chunk *first, *last; |
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void _reserve (int size); |
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void _clear (); |
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void clear (); |
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void finish (); |
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public: |
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dynbuf (int initial = 4096, int extend = 16384); |
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~dynbuf (); |
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int size () const { return _size + (ptr - last->data); } |
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bool empty () const { return !size (); } |
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void linearise (void *data); |
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char *linearise (); // does not 0-terminate(!) |
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int room () const { return end - ptr; } |
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char *force (int size) |
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{ |
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if (expect_false (ptr + size >= end)) |
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_reserve (size); |
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return ptr; |
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} |
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char *falloc (int size) |
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{ |
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char *res = ptr; |
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ptr += size; |
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return res; |
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} |
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char *alloc (int size) |
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{ |
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force (size); |
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return falloc (size); |
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} |
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void fadd (char c) { *ptr++ = c; } |
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void fadd (unsigned char c) { fadd (char (c)); } |
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void fadd (const void *p, int len) |
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{ |
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memcpy (falloc (len), p, len); |
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} |
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void add (const void *p, int len) |
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{ |
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force (len); |
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fadd (p, len); |
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} |
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void add (char c) |
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{ |
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alloc (1)[0] = c; |
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} |
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void add (const char *s) |
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{ |
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add (s, strlen (s)); |
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} |
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void add (const shstr &s) |
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{ |
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add (s.s, s.length ()); |
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} |
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//TODO |
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//void add_destructive (dynbuf &buf); |
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dynbuf &operator << (char c) { add (c); return *this; } |
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dynbuf &operator << (unsigned char c) { return *this << char (c); } |
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dynbuf &operator << (const char *s) { add (s); return *this; } |
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dynbuf &operator << (const shstr &s) { add (s); return *this; } |
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dynbuf &operator << (const std::string &s) { add (s.data(), s.size ()); return *this; } |
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operator std::string (); |
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}; |
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struct dynbuf_text : dynbuf |
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{ |
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dynbuf_text (int initial = 4096, int extend = 16384) |
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: dynbuf (initial, extend) |
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{ } |
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using dynbuf::add; |
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void add (sint32 i); |
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void add (sint64 i); |
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void printf (const char *format, ...); |
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1.1 |
}; |
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#endif |
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