memmgt.h

/*
 * Copyright (c) 2008-2009 Carnegie Mellon University.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
#ifndef HEADER_MEMMGT
#define HEADER_MEMMGT


typedef struct mem_buffer {
   void *value;
   void *cursor;
   size_t length;
   size_t allocated;
} *mb_t;

struct mem_buffer *buf_alloc(size_t);
void buf_free(struct mem_buffer *);
int buf_grow(struct mem_buffer *, size_t);

#define reset_cursor(x) ((x)->cursor = (x)->value)
#define set_cursor(x, i) ((x)->cursor = &((char *)(x)->value)[i])
#define get_cursor(x) ((char *)(x)->cursor - (char *)(x)->value)
#define get_offset(x, p) (p - (char *)(x)->value)
int buf_putdata(struct mem_buffer *, const void *, const size_t);
int buf_appenddata(struct mem_buffer *, const void *, const size_t);
int buf_getdata(struct mem_buffer *, void *, const size_t);
int buf_putint(struct mem_buffer *, const unsigned int);
int buf_appendint(struct mem_buffer *, const unsigned int);
int buf_getint(struct mem_buffer *, unsigned int *);
int buf_putstring(struct mem_buffer *, const char *);
int buf_appendstring(struct mem_buffer *, const char *);
int buf_getstring(struct mem_buffer *, char **, void *(*)(size_t));
int buf_setlength(struct mem_buffer *, const size_t);
#endif