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292 lines
7.5 KiB
292 lines
7.5 KiB
4 months ago
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/*****************************************************************************/
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// Copyright 2006-2007 Adobe Systems Incorporated
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// All Rights Reserved.
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//
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// NOTICE: Adobe permits you to use, modify, and distribute this file in
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// accordance with the terms of the Adobe license agreement accompanying it.
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/*****************************************************************************/
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/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_ref_counted_block.h#2 $ */
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/* $DateTime: 2012/07/31 22:04:34 $ */
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/* $Change: 840853 $ */
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/* $Author: tknoll $ */
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/** Support for a refcounted block, with optional copy-on-write
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*/
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/*****************************************************************************/
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#ifndef __dng_ref_counted_block__
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#define __dng_ref_counted_block__
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/*****************************************************************************/
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#include "dng_types.h"
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#include "dng_mutex.h"
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/*****************************************************************************/
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/// \brief Class to provide resource acquisition is instantiation discipline
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/// for small memory allocations.
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///
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/// This class does not use dng_memory_allocator for memory allocation.
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class dng_ref_counted_block
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{
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private:
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struct header
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{
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dng_mutex fMutex;
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uint32 fRefCount;
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uint32 fSize;
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header (uint32 size)
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: fMutex ("dng_ref_counted_block")
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, fRefCount (1)
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, fSize (size)
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{
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}
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~header ()
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{
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}
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};
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void *fBuffer;
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public:
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/// Construct an empty memory buffer using malloc.
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/// \exception dng_memory_full with fErrorCode equal to dng_error_memory.
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dng_ref_counted_block ();
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/// Construct memory buffer of size bytes using malloc.
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/// \param size Number of bytes of memory needed.
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/// \exception dng_memory_full with fErrorCode equal to dng_error_memory.
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dng_ref_counted_block (uint32 size);
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/// Release memory buffer using free.
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~dng_ref_counted_block ();
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/// Copy constructore, which takes a reference to data and does not copy the block.
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dng_ref_counted_block (const dng_ref_counted_block &data);
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/// Assignment operatore takes a reference to right hand side and does not copy the data.
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dng_ref_counted_block & operator= (const dng_ref_counted_block &data);
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/// Clear existing memory buffer and allocate new memory of size bytes.
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/// \param size Number of bytes of memory needed.
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/// \exception dng_memory_full with fErrorCode equal to dng_error_memory.
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void Allocate (uint32 size);
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/// Release any allocated memory using free. Object is still valid and
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/// Allocate can be called again.
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void Clear ();
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/// If there is only one reference, do nothing, otherwise copy the data into a new block and return an object with that block as the data.
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void EnsureWriteable ();
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/// Return pointer to allocated memory as a void *..
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/// \retval void * valid for as many bytes as were allocated.
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uint32 LogicalSize ()
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{
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return ((header *)fBuffer)->fSize;
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}
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void * Buffer ()
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{
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return (void *)((char *)fBuffer + sizeof (header));
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}
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/// Return pointer to allocated memory as a const void *.
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/// \retval const void * valid for as many bytes as were allocated.
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const void * Buffer () const
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{
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return (const void *)((char *)fBuffer + sizeof (header));
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}
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/// Return pointer to allocated memory as a char *.
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/// \retval char * valid for as many bytes as were allocated.
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char * Buffer_char ()
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{
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return (char *) Buffer ();
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}
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/// Return pointer to allocated memory as a const char *.
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/// \retval const char * valid for as many bytes as were allocated.
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const char * Buffer_char () const
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{
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return (const char *) Buffer ();
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}
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/// Return pointer to allocated memory as a uint8 *.
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/// \retval uint8 * valid for as many bytes as were allocated.
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uint8 * Buffer_uint8 ()
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{
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return (uint8 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const uint8 *.
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/// \retval const uint8 * valid for as many bytes as were allocated.
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const uint8 * Buffer_uint8 () const
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{
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return (const uint8 *) Buffer ();
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}
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/// Return pointer to allocated memory as a uint16 *.
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/// \retval uint16 * valid for as many bytes as were allocated.
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uint16 * Buffer_uint16 ()
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{
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return (uint16 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const uint16 *.
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/// \retval const uint16 * valid for as many bytes as were allocated.
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const uint16 * Buffer_uint16 () const
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{
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return (const uint16 *) Buffer ();
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}
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/// Return pointer to allocated memory as a int16 *.
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/// \retval int16 * valid for as many bytes as were allocated.
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int16 * Buffer_int16 ()
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{
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return (int16 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const int16 *.
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/// \retval const int16 * valid for as many bytes as were allocated.
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const int16 * Buffer_int16 () const
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{
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return (const int16 *) Buffer ();
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}
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/// Return pointer to allocated memory as a uint32 *.
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/// \retval uint32 * valid for as many bytes as were allocated.
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uint32 * Buffer_uint32 ()
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{
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return (uint32 *) Buffer ();
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}
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/// Return pointer to allocated memory as a uint32 *.
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/// \retval uint32 * valid for as many bytes as were allocated.
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const uint32 * Buffer_uint32 () const
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{
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return (const uint32 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const int32 *.
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/// \retval const int32 * valid for as many bytes as were allocated.
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int32 * Buffer_int32 ()
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{
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return (int32 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const int32 *.
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/// \retval const int32 * valid for as many bytes as were allocated.
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const int32 * Buffer_int32 () const
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{
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return (const int32 *) Buffer ();
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}
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/// Return pointer to allocated memory as a uint64 *.
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/// \retval uint64 * valid for as many bytes as were allocated.
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uint64 * Buffer_uint64 ()
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{
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return (uint64 *) Buffer ();
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}
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/// Return pointer to allocated memory as a uint64 *.
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/// \retval uint64 * valid for as many bytes as were allocated.
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const uint64 * Buffer_uint64 () const
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{
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return (const uint64 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const int64 *.
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/// \retval const int64 * valid for as many bytes as were allocated.
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int64 * Buffer_int64 ()
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{
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return (int64 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const int64 *.
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/// \retval const int64 * valid for as many bytes as were allocated.
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const int64 * Buffer_int64 () const
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{
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return (const int64 *) Buffer ();
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}
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/// Return pointer to allocated memory as a real32 *.
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/// \retval real32 * valid for as many bytes as were allocated.
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real32 * Buffer_real32 ()
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{
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return (real32 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const real32 *.
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/// \retval const real32 * valid for as many bytes as were allocated.
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const real32 * Buffer_real32 () const
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{
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return (const real32 *) Buffer ();
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}
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/// Return pointer to allocated memory as a real64 *.
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/// \retval real64 * valid for as many bytes as were allocated.
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real64 * Buffer_real64 ()
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{
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return (real64 *) Buffer ();
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}
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/// Return pointer to allocated memory as a const real64 *.
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/// \retval const real64 * valid for as many bytes as were allocated.
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const real64 * Buffer_real64 () const
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{
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return (const real64 *) Buffer ();
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}
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};
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/*****************************************************************************/
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#endif
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/*****************************************************************************/
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