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113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/**
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* Copyright (c) 2013 Mozilla Foundation and Contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <webvtt/util.h>
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#include <stdlib.h>
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#include <string.h>
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static void *default_alloc( void *unused, webvtt_uint nb );
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static void default_free( void *unused, void *ptr );
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struct {
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/**
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* Number of allocated objects. Forbid changing the allocator if this is not
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* equal to 0
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*/
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webvtt_uint n_alloc;
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webvtt_alloc_fn_ptr alloc;
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webvtt_free_fn_ptr free;
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void *alloc_data;
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} allocator = { 0, default_alloc, default_free, 0 };
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static void *WEBVTT_CALLBACK
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default_alloc( void *unused, webvtt_uint nb )
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{
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(void)unused;
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return malloc( nb );
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}
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static void WEBVTT_CALLBACK
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default_free( void *unused, void *ptr )
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{
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(void)unused;
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free( ptr );
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}
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WEBVTT_EXPORT void
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webvtt_set_allocator( webvtt_alloc_fn_ptr alloc, webvtt_free_fn_ptr free, void *userdata )
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{
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/**
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* TODO:
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* This really needs a lock. But then, so does all the allocation/free
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* functions...
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* that could be a problem.
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*/
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if( allocator.n_alloc == 0 ) {
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if( alloc && free ) {
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allocator.alloc = alloc;
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allocator.free = free;
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allocator.alloc_data = userdata;
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} else if( !alloc && !free ) {
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allocator.alloc = &default_alloc;
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allocator.free = &default_free;
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allocator.alloc_data = 0;
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}
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}
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}
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/**
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* public alloc/dealloc functions
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*/
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WEBVTT_EXPORT void *
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webvtt_alloc( webvtt_uint nb )
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{
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void *ret = allocator.alloc( allocator.alloc_data, nb );
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if( ret )
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{ ++allocator.n_alloc; }
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return ret;
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}
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WEBVTT_EXPORT void *
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webvtt_alloc0( webvtt_uint nb )
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{
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void *ret = allocator.alloc( allocator.alloc_data, nb );
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if( ret ) {
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++allocator.n_alloc;
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memset( ret, 0, nb );
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}
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return ret;
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}
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WEBVTT_EXPORT void
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webvtt_free( void *data )
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{
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if( data && allocator.n_alloc ) {
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allocator.free( allocator.alloc_data, data );
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--allocator.n_alloc;
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}
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}
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