Support for XISF

2022-04-12 08:17:18 +02:00
parent e5cd25cc77
commit 0fb27266c7
278 changed files with 209068 additions and 7 deletions
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+//     ____   ______ __
+//    / __ \ / ____// /
+//   / /_/ // /    / /
+//  / ____// /___ / /___   PixInsight Class Library
+// /_/     \____//_____/   PCL 2.4.23
+// ----------------------------------------------------------------------------
+// pcl/EndianConversions.h - Released 2022-03-12T18:59:29Z
+// ----------------------------------------------------------------------------
+// This file is part of the PixInsight Class Library (PCL).
+// PCL is a multiplatform C++ framework for development of PixInsight modules.
+//
+// Copyright (c) 2003-2022 Pleiades Astrophoto S.L. All Rights Reserved.
+//
+// Redistribution and use in both source and binary forms, with or without
+// modification, is permitted provided that the following conditions are met:
+//
+// 1. All redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//
+// 2. All 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. Neither the names "PixInsight" and "Pleiades Astrophoto", nor the names
+//    of their contributors, may be used to endorse or promote products derived
+//    from this software without specific prior written permission. For written
+//    permission, please contact info@pixinsight.com.
+//
+// 4. All products derived from this software, in any form whatsoever, must
+//    reproduce the following acknowledgment in the end-user documentation
+//    and/or other materials provided with the product:
+//
+//    "This product is based on software from the PixInsight project, developed
+//    by Pleiades Astrophoto and its contributors (https://pixinsight.com/)."
+//
+//    Alternatively, if that is where third-party acknowledgments normally
+//    appear, this acknowledgment must be reproduced in the product itself.
+//
+// THIS SOFTWARE IS PROVIDED BY PLEIADES ASTROPHOTO AND ITS 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 PLEIADES ASTROPHOTO OR ITS
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, BUSINESS
+// INTERRUPTION; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; AND LOSS OF USE,
+// DATA OR PROFITS) 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.
+// ----------------------------------------------------------------------------
+
+#ifndef __PCL_EndianConversions_h
+#define __PCL_EndianConversions_h
+
+/// \file pcl/EndianConversions.h
+
+#include <pcl/Defs.h>
+
+#include <pcl/Math.h>
+
+namespace pcl
+{
+
+// ----------------------------------------------------------------------------
+
+/*!
+ * \defgroup endianness_conversion_and_detection Endianness Conversion and Detection Functions
+ */
+
+/*!
+ * Converts a 16-bit unsigned integer from big endian to little endian byte
+ * storage order.
+ *
+ * \ingroup endianness_conversion_and_detection
+ */
+inline uint16 BigToLittleEndian( uint16 x )
+{
+   return (x << 8) | (x >> 8);
+}
+
+/*!
+ * Converts a 32-bit unsigned integer from big endian to little endian byte
+ * storage order.
+ *
+ * \ingroup endianness_conversion_and_detection
+ */
+inline uint32 BigToLittleEndian( uint32 x )
+{
+   return (RotL( x, 8 ) & 0x00ff00ffu) | (RotR( x, 8 ) & 0xff00ff00u);
+
+}
+
+/*!
+ * Converts a 64-bit unsigned integer from big endian to little endian byte
+ * storage order.
+ *
+ * \ingroup endianness_conversion_and_detection
+ */
+inline uint64 BigToLittleEndian( uint64 x )
+{
+   return (uint64( BigToLittleEndian( uint32( x ) ) ) << 32) | uint64( BigToLittleEndian( uint32( x >> 32 ) ) );
+}
+
+/*!
+ * A convenience synonym function for little-to-big endian conversions, which
+ * we define for the sake of code legibility. It is obviously equivalent to
+ * BigToLittleEndian( x ).
+ *
+ * \ingroup endianness_conversion_and_detection
+ */
+template <typename T> inline T LittleToBigEndian( T x )
+{
+   return BigToLittleEndian( x );
+}
+
+// ----------------------------------------------------------------------------
+
+union __pcl_endian_check__ { uint32 w; uint8 b[ sizeof( uint32 ) ]; };
+
+constexpr __pcl_endian_check__ __pcl_endian_check_sample__ = { 0xdeadbeef };
+
+#ifdef __clang__
+
+inline bool IsLittleEndianMachine()
+{
+   return __pcl_endian_check_sample__.b[0] == 0xef;
+}
+
+inline bool IsBigEndianMachine()
+{
+   return __pcl_endian_check_sample__.b[0] == 0xde;
+}
+
+#else
+
+// Clang fails here with "read of member 'b' of union with active member 'w' is
+// not allowed in a constant expression".
+
+/*!
+ * Returns true iff the caller is running on a little-endian architecture.
+ *
+ * \ingroup endianness_conversion_and_detection
+ */
+constexpr bool IsLittleEndianMachine()
+{
+   return __pcl_endian_check_sample__.b[0] == 0xef;
+}
+
+/*!
+ * Returns true iff the caller is running on a big-endian architecture.
+ *
+ * \ingroup endianness_conversion_and_detection
+ */
+constexpr bool IsBigEndianMachine()
+{
+   return __pcl_endian_check_sample__.b[0] == 0xde;
+}
+
+#endif // __clang__
+
+// ----------------------------------------------------------------------------
+
+} // pcl
+
+#endif   // __PCL_EndianConversions_h
+
+// ----------------------------------------------------------------------------
+// EOF pcl/EndianConversions.h - Released 2022-03-12T18:59:29Z