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<div class="document" id="memory">
<h1 class="title">memory</h1>
<h2 class="subtitle" id="memory-allocation-deallocation-functions">Memory allocation/deallocation functions</h2>
<div class="contents topic" id="contents">
<p class="topic-title">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#magickallocfunctions" id="id15">MagickAllocFunctions</a></li>
<li><a class="reference internal" href="#magickmalloc" id="id16">MagickMalloc</a></li>
<li><a class="reference internal" href="#magickmallocaligned" id="id17">MagickMallocAligned</a></li>
<li><a class="reference internal" href="#magickmalloccleared" id="id18">MagickMallocCleared</a></li>
<li><a class="reference internal" href="#magickclonememory" id="id19">MagickCloneMemory</a></li>
<li><a class="reference internal" href="#magickrealloc" id="id20">MagickRealloc</a></li>
<li><a class="reference internal" href="#magickfree" id="id21">MagickFree</a></li>
<li><a class="reference internal" href="#magickfreealigned" id="id22">MagickFreeAligned</a></li>
</ul>
</div>
<div class="section" id="magickallocfunctions">
<h1><a class="toc-backref" href="#id15">MagickAllocFunctions</a></h1>
<div class="section" id="synopsis">
<h2>Synopsis</h2>
<pre class="literal-block">
void MagickAllocFunctions( MagickFreeFunc free_func, MagickMallocFunc malloc_func,
MagickReallocFunc realloc_func );
</pre>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>MagickAllocFunctions() provides a way for the user to supply a preferred
free(), malloc(), and realloc() functions. Otherwise the default system
versions are used. If an alternative allocator is to be used, this
function should be invoked prior to invoking InitializeMagick().</p>
<p>The format of the MagickAllocFunctions method is:</p>
<pre class="literal-block">
void MagickAllocFunctions( MagickFreeFunc free_func, MagickMallocFunc malloc_func,
MagickReallocFunc realloc_func );
</pre>
<dl class="docutils">
<dt>free_func:</dt>
<dd>Function to free memory.</dd>
<dt>malloc_func:</dt>
<dd>Function to allocate memory.</dd>
<dt>realloc_func:</dt>
<dd>Function to reallocate memory.</dd>
</dl>
</div>
</div>
<div class="section" id="magickmalloc">
<h1><a class="toc-backref" href="#id16">MagickMalloc</a></h1>
<div class="section" id="id1">
<h2>Synopsis</h2>
<pre class="literal-block">
void *MagickMalloc( const size_t size );
</pre>
</div>
<div class="section" id="id2">
<h2>Description</h2>
<p>MagickMalloc() returns a pointer to a block of memory of at least size
bytes suitably aligned for any use. NULL is returned if insufficient
memory is available or the requested size is zero.</p>
<p>The format of the MagickMalloc method is:</p>
<pre class="literal-block">
void *MagickMalloc( const size_t size );
</pre>
<p>A description of each parameter follows:</p>
<dl class="docutils">
<dt>size:</dt>
<dd>The size of the memory in bytes to allocate.</dd>
</dl>
</div>
</div>
<div class="section" id="magickmallocaligned">
<h1><a class="toc-backref" href="#id17">MagickMallocAligned</a></h1>
<div class="section" id="id3">
<h2>Synopsis</h2>
<pre class="literal-block">
void *MagickMallocAligned( size_t alignment, const size_t size );
</pre>
</div>
<div class="section" id="id4">
<h2>Description</h2>
<p>MagickMallocAligned() allocates memory and returns a pointer to a
block of memory capable of storing at least size bytes with the
allocation's base address being an even multiple of alignment.
The size of the buffer allocation is rounded up as required in
order to consume a block of memory starting at least at the requested
alignment and ending at at least the requested alignment.</p>
<p>The requested alignment should be a power of 2 at least as large as
sizeof a void pointer.</p>
<p>NULL is returned if insufficient memory is available, the requested
size is zero, or integer overflow was detected.</p>
<p>This function is intended for allocating special-purpose buffers
which benefit from specific alignment.</p>
<p>The allocated memory should only be freed using MagickFreeAligned()
and may not be reallocated.</p>
<p>The format of the MagickMallocAligned method is:</p>
<pre class="literal-block">
void *MagickMallocAligned( size_t alignment, const size_t size );
</pre>
<p>A description of each parameter follows:</p>
<dl class="docutils">
<dt>alignment:</dt>
<dd>The alignment of the base and size of the allocated
memory.</dd>
<dt>size:</dt>
<dd>The size of the memory in bytes to allocate.</dd>
</dl>
</div>
</div>
<div class="section" id="magickmalloccleared">
<h1><a class="toc-backref" href="#id18">MagickMallocCleared</a></h1>
<div class="section" id="id5">
<h2>Synopsis</h2>
<pre class="literal-block">
void *MagickMallocCleared( const size_t size );
</pre>
</div>
<div class="section" id="id6">
<h2>Description</h2>
<p>MagickMallocCleared() returns a pointer to a block of memory of at least
size bytes suitably aligned for any use. NULL is returned if insufficient
memory is available or the requested size is zero. This version differs
from MagickMalloc in that the allocated bytes are cleared to zero.</p>
<p>The format of the MagickMallocCleared method is:</p>
<pre class="literal-block">
void *MagickMallocCleared( const size_t size );
</pre>
<p>A description of each parameter follows:</p>
<dl class="docutils">
<dt>size:</dt>
<dd>The size of the memory in bytes to allocate.</dd>
</dl>
</div>
</div>
<div class="section" id="magickclonememory">
<h1><a class="toc-backref" href="#id19">MagickCloneMemory</a></h1>
<div class="section" id="id7">
<h2>Synopsis</h2>
<pre class="literal-block">
void *MagickCloneMemory( void *destination, const void *source, const size_t size );
</pre>
</div>
<div class="section" id="id8">
<h2>Description</h2>
<p>MagickCloneMemory() copies size bytes from memory area source to the
destination. Copying between objects that overlap will take place
correctly. It returns destination.</p>
<p>The format of the MagickCloneMemory method is:</p>
<pre class="literal-block">
void *MagickCloneMemory( void *destination, const void *source, const size_t size );
</pre>
<dl class="docutils">
<dt>size:</dt>
<dd>The size of the memory in bytes to allocate.</dd>
</dl>
</div>
</div>
<div class="section" id="magickrealloc">
<h1><a class="toc-backref" href="#id20">MagickRealloc</a></h1>
<div class="section" id="id9">
<h2>Synopsis</h2>
<pre class="literal-block">
void *MagickRealloc( void *memory, const size_t size );
</pre>
</div>
<div class="section" id="id10">
<h2>Description</h2>
<p>MagickRealloc() changes the size of the memory and returns a pointer to
the (possibly moved) block. The contents will be unchanged up to the
lesser of the new and old sizes. If size is zero, then the memory is
freed and a NULL value is returned. If the memory allocation fails, then
the existing memory is freed, and a NULL value is returned.</p>
<p>Note that the behavior of this function is similar to BSD reallocf(3),
see <a class="reference external" href="https://www.freebsd.org/cgi/man.cgi?query=reallocf">https://www.freebsd.org/cgi/man.cgi?query=reallocf</a></p>
<p>The format of the MagickRealloc method is:</p>
<pre class="literal-block">
void *MagickRealloc( void *memory, const size_t size );
</pre>
<p>A description of each parameter follows:</p>
<dl class="docutils">
<dt>memory:</dt>
<dd>A pointer to a memory allocation.</dd>
<dt>size:</dt>
<dd>The new size of the allocated memory.</dd>
</dl>
</div>
</div>
<div class="section" id="magickfree">
<h1><a class="toc-backref" href="#id21">MagickFree</a></h1>
<div class="section" id="id11">
<h2>Synopsis</h2>
<pre class="literal-block">
void MagickFree( void *memory );
</pre>
</div>
<div class="section" id="id12">
<h2>Description</h2>
<p>MagickFree() frees memory that has already been allocated by
MagickMalloc() or other other other allocators directly compatible
with the currently defined memory allocator (which defaults to the
system malloc()). For convenience, a NULL argument is ignored.</p>
<p>The format of the MagickFree method is:</p>
<pre class="literal-block">
void MagickFree( void *memory );
</pre>
<p>A description of each parameter follows:</p>
<dl class="docutils">
<dt>memory:</dt>
<dd>A pointer to a block of memory to free for reuse.</dd>
</dl>
</div>
</div>
<div class="section" id="magickfreealigned">
<h1><a class="toc-backref" href="#id22">MagickFreeAligned</a></h1>
<div class="section" id="id13">
<h2>Synopsis</h2>
<pre class="literal-block">
void MagickFreeAligned( void *memory );
</pre>
</div>
<div class="section" id="id14">
<h2>Description</h2>
<p>MagickFreeAligned() frees aligned memory that has previously been
allocated via MagickMallocAligned(). For convenience, a NULL argument is
ignored.</p>
<p>This function exists in case the pointer allocated by
MagickMallocAligned() can not be used directly with MagickFree().</p>
<p>The format of the MagickFreeAligned method is:</p>
<pre class="literal-block">
void MagickFreeAligned( void *memory );
</pre>
<p>A description of each parameter follows:</p>
<dl class="docutils">
<dt>memory:</dt>
<dd>A pointer to a block of memory to free for reuse.</dd>
</dl>
</div>
</div>
</div>
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