94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/*
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* Copyright (c) 2020 Genome Research Ltd.
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* Author(s): James Bonfield
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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 met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* 3. Neither the names Genome Research Ltd and Wellcome Trust Sanger
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* Institute nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY GENOME RESEARCH LTD AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENOME RESEARCH
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* LTD 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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#ifndef HTSCODECS_ENDIAN_H
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#define HTSCODECS_ENDIAN_H
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// Endianness checking.
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// Sets HTSCODECS_ENDIAN_KNOWN if system type detected and either
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// HTSCODECS_LITTLE_ENDIAN or HTSCODECS_BIG_ENDIAN.
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/*
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* In general our preferred route is to write code in an endian agnostic
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* fashion, but our data formats are natively little endian. Therefore
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* in time critical code it's sometimes best to exploit that.
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*
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* Therefore we'll optimise code along the lines of:
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*
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* #ifdef HTSCODECS_LITTLE_ENDIAN
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* // do something little endian specific
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* #else
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* // do something in an endian agnostic fashion
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* #endif
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*
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* This means our code works even if we fail to recognise the
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* specific machine type.
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*/
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#if (defined(__i386__) \
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|| defined(__i386) \
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|| defined(__amd64__) \
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|| defined(__amd64) \
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|| defined(__x86_64__) \
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|| defined(__x86_64) \
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|| defined(__i686__) \
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|| defined(__i686)) \
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|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
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|| defined(__LITTLE_ENDIAN__) \
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|| defined(__ARMEL__) \
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|| defined(__THUMBEL__) \
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|| defined(__AARCH64EL__) \
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|| defined(_MIPSEL) \
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|| defined(__MIPSEL) \
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|| defined(__MIPSEL__)
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// Little endian
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# define HTSCODECS_LITTLE_ENDIAN
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# define HTSCODECS_ENDIAN_KNOWN
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#elif (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
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|| defined(__BIG_ENDIAN__) \
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|| defined(__ARMEB__) \
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|| defined(__THUMBEB__) \
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|| defined(__AAARCHEB__) \
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|| defined(_MIPSEB) \
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|| defined(__MIPSEB) \
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|| defined(__MIPSEB__)
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// Big endian
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# define HTSCODECS_BIG_ENDIAN
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# define HTSCODECS_ENDIAN_KNOWN
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#else
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// Unknown - code will need to check HTSCODES_ENDIAN_KNOWN and do endian agnostic
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#endif
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#endif /* HTSCODECS_ENDIAN_H */
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