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/*
* Bindle Binaries Tools
* Copyright (C) 2022 David M. Syzdek <david@syzdek.net>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of David M. Syzdek nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M. SYZDEK BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _LIB_LIBBINDLE_LOBJ_C 1
#include "lobj.h"
///////////////
// //
// Headers //
// //
///////////////
// MARK: - Headers
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <syslog.h>
#include <stdatomic.h>
#include <assert.h>
///////////////////
// //
// Definitions //
// //
///////////////////
// MARK: - Definitions
// Magic number used to determine if memory passed to bindle_free() is a
// "bindle_obj_t" or raw virtual memory. The magic number purposely starts
// and ends with a byte equal to zero so that it cannot match a string.
#define BNDL_MAGIC ((const uint8_t *)"\0Bindle\0")
//////////////////
// //
// Prototypes //
// //
//////////////////
// MARK: - Prototypes
static int
bindle_verify_is_obj(
bindle_obj_t * obj );
/////////////////
// //
// Functions //
// //
/////////////////
// MARK: - Functions
void *
bindle_alloc(
size_t size,
void (*free_func)(void * ptr) )
{
bindle_obj_t * obj;
BindleDebugTrace();
assert(size >= BNDL_OBJ_SIZE);
if ((obj = malloc(size)) == NULL)
return(NULL);
memset(obj, 0, size);
memcpy(obj->magic, BNDL_MAGIC, 8);
atomic_init(&obj->ref_count, 0);
obj->free_func = ((free_func)) ? free_func : &free;
return(obj);
}
void
bindle_free(
void * ptr )
{
BindleDebugTrace();
if (!(ptr))
return;
if (bindle_verify_is_obj(ptr) == BNDL_NO)
{
free(ptr);
return;
};
bindle_release(ptr);
return;
}
void *
bindle_realloc(
void * ptr,
size_t size )
{
BindleDebugTrace();
assert(size >= BNDL_OBJ_SIZE);
return(realloc(ptr, size));
}
void
bindle_release(
bindle_obj_t * obj )
{
BindleDebugTrace();
assert(obj != NULL);
assert(bindle_verify_is_obj(obj) == BNDL_YES);
if (atomic_fetch_sub(&obj->ref_count, 1) > 1)
return;
obj->free_func(obj);
return;
}
void *
bindle_retain(
bindle_obj_t * obj )
{
BindleDebugTrace();
if (obj == NULL)
return(NULL);
assert(bindle_verify_is_obj(obj) == BNDL_YES);
atomic_fetch_add(&obj->ref_count, 1);
return(obj);
}
int
bindle_retain_count(
bindle_obj_t * obj )
{
BindleDebugTrace();
if (obj == NULL)
return(0);
assert(bindle_verify_is_obj(obj) == BNDL_YES);
return((int)atomic_fetch_add(&obj->ref_count, 0));
}
int
bindle_verify_is_obj(
bindle_obj_t * obj )
{
size_t pos;
BindleDebugTrace();
if (!(obj))
return(BNDL_NO);
for(pos = 0; (pos < 8); pos++)
if (obj->magic[pos] != BNDL_MAGIC[pos])
return(BNDL_NO);
return(BNDL_YES);
}
/* end of source */
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