1007 lines
25 KiB
C
1007 lines
25 KiB
C
/*
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LICENSE:
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Copyright (c) 2004, Brian Hook
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All rights reserved.
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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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* 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
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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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* The names of this package'ss contributors contributors may not
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be used to endorse or promote products derived from this
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software without specific prior written permission.
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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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OWNER 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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/**
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@file posh.c
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@author Brian Hook
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@date 2002
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@brief Portable Open Source Harness primary source file
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*/
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#include "posh.h"
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#if !defined FORCE_DOXYGEN
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#if !defined POSH_NO_FLOAT
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# define POSH_FLOAT_STRING "enabled"
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#else
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# define POSH_FLOAT_STRING "disabled"
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#endif
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#if defined POSH_64BIT_INTEGER
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# define POSH_64BIT_INTEGER_STRING "yes"
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#else
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# define POSH_64BIT_INTEGER_STRING "no"
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#endif
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#if defined POSH_64BIT_POINTER
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# define POSH_POINTER_STRING "64-bits"
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#else
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# define POSH_POINTER_STRING "32-bits"
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#endif
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#if defined POSH_LITTLE_ENDIAN
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# define IS_BIG_ENDIAN 0
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# define NATIVE16 POSH_LittleU16
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# define NATIVE32 POSH_LittleU32
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# define NATIVE64 POSH_LittleU64
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# define FOREIGN16 POSH_BigU16
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# define FOREIGN32 POSH_BigU32
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# define FOREIGN64 POSH_BigU64
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#else
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# define IS_BIG_ENDIAN 1
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# define NATIVE16 POSH_BigU16
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# define NATIVE32 POSH_BigU32
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# define NATIVE64 POSH_BigU64
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# define FOREIGN16 POSH_LittleU16
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# define FOREIGN32 POSH_LittleU32
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# define FOREIGN64 POSH_LittleU64
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#endif /* POSH_LITTLE_ENDIAN */
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static
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int
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s_testBigEndian( void )
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{
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union
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{
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posh_byte_t c[ 4 ];
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posh_u32_t i;
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} u;
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u.i= 1;
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if ( u.c[ 0 ] == 1 )
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{
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return 0;
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}
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return 1;
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}
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static
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const char *
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s_testSerialization( void )
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{
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posh_byte_t serbuf[ 8 ];
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posh_u16_t tmp16;
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posh_u32_t tmp32;
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/* 16-bit serialization */
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POSH_WriteU16ToLittle( serbuf, 0xABCD );
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if ( ( tmp16 = POSH_ReadU16FromLittle( serbuf ) ) != 0xABCD )
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{
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return "*ERROR: failed little-endian 16-bit serialization test";
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}
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POSH_WriteU16ToBig( serbuf, 0xABCD );
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if ( ( tmp16 = POSH_ReadU16FromBig( serbuf ) ) != 0xABCD )
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{
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return "*ERROR: failed big-endian 16-bit serialization test";
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}
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/* 32-bit serialization */
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POSH_WriteU32ToLittle( serbuf, 0xABCD1234L );
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if ( ( tmp32 = POSH_ReadU32FromLittle( serbuf ) ) != 0xABCD1234 )
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{
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return "*ERROR: failed little-endian 32-bit serialization test";
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}
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POSH_WriteU32ToBig( serbuf, 0xABCD1234L );
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if ( ( tmp32 = POSH_ReadU32FromBig( serbuf ) ) != 0xABCD1234 )
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{
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return "*ERROR: failed big-endian 32-bit serialization test";
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}
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#if defined POSH_64BIT_INTEGER
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{
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#define REF64 POSH_U64(0xFEDCBA9876543210)
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posh_u64_t tmp64;
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POSH_WriteU64ToLittle( serbuf, REF64 );
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if ( ( tmp64 = POSH_ReadU64FromLittle( serbuf ) ) != REF64 )
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{
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return "*ERROR: failed little-endian 64-bit serialization test";
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}
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POSH_WriteU64ToBig( serbuf, REF64 );
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if ( ( tmp64 = POSH_ReadU64FromBig( serbuf ) ) != REF64 )
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{
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return "*ERROR: failed big-endian 64-bit serialization test";
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}
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}
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#endif
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return 0;
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}
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#if !defined POSH_NO_FLOAT
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static
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const char *
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s_testFloatingPoint( void )
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{
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float fRef = 10.0f/30.0f;
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double dRef = 10.0/30.0;
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posh_byte_t dbuf[ 8 ];
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float fTmp;
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double dTmp;
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fTmp = POSH_FloatFromLittleBits( POSH_LittleFloatBits( fRef ) );
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if ( fTmp != fRef )
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{
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return "*ERROR: POSH little endian floating point conversion failed. Please report this to poshlib@poshlib.org!\n";
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}
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fTmp = POSH_FloatFromBigBits( POSH_BigFloatBits( fRef ) );
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if ( fTmp != fRef )
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{
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return "*ERROR: POSH big endian floating point conversion failed. Please report this to poshlib@poshlib.org!\n";
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}
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POSH_DoubleBits( dRef, dbuf );
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dTmp = POSH_DoubleFromBits( dbuf );
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if ( dTmp != dRef )
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{
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return "*ERROR: POSH double precision floating point serialization failed. Please report this to poshlib@poshlib.org!\n";
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}
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return 0;
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}
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#endif /* !defined POSH_NO_FLOAT */
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static
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const char *
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s_testEndianess( void )
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{
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/* check endianess */
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if ( s_testBigEndian() != IS_BIG_ENDIAN )
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{
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return "*ERROR: POSH compile time endianess does not match run-time endianess verification. Please report this to poshlib@poshlib.org!\n";
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}
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/* make sure our endian swap routines work */
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if ( ( NATIVE32( 0x11223344L ) != 0x11223344L ) ||
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( FOREIGN32( 0x11223344L ) != 0x44332211L ) ||
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( NATIVE16( 0x1234 ) != 0x1234 ) ||
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( FOREIGN16( 0x1234 ) != 0x3412 ) )
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{
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return "*ERROR: POSH endianess macro selection failed. Please report this to poshlib@poshlib.org!\n";
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}
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/* test serialization routines */
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return 0;
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}
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#endif /* !defined FORCE_DOXYGEN */
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/**
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Returns a string describing this platform's basic attributes.
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POSH_GetArchString() reports on an architecture's statically determined
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attributes. In addition, it will perform run-time verification checks
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to make sure the various platform specific functions work. If an error
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occurs, please contact me at poshlib@poshlib.org so we can try to resolve
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what the specific failure case is.
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@returns a string describing this platform on success, or a string in the
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form "*ERROR: [text]" on failure. You can simply check to see if
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the first character returned is '*' to verify an error condition.
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*/
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const char *
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POSH_GetArchString( void )
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{
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const char *err;
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const char *s = "OS:.............."POSH_OS_STRING"\n"
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"CPU:............."POSH_CPU_STRING"\n"
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"endian:.........."POSH_ENDIAN_STRING"\n"
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"ptr size:........"POSH_POINTER_STRING"\n"
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"64-bit ints......"POSH_64BIT_INTEGER_STRING"\n"
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"floating point..."POSH_FLOAT_STRING"\n"
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"compiler........."POSH_COMPILER_STRING"\n";
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/* test endianess */
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err = s_testEndianess();
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if ( err != 0 )
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{
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return err;
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}
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/* test serialization */
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err = s_testSerialization();
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if ( err != 0 )
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{
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return err;
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}
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#if !defined POSH_NO_FLOAT
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/* check that our floating point support is correct */
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err = s_testFloatingPoint();
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if ( err != 0 )
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{
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return err;
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}
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#endif
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return s;
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}
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/* ---------------------------------------------------------------------------*/
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/* BYTE SWAPPING SUPPORT */
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/* ---------------------------------------------------------------------------*/
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/**
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* Byte swaps a 16-bit unsigned value
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*
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@ingroup ByteSwapFunctions
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@param v [in] unsigned 16-bit input value to swap
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@returns a byte swapped version of v
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*/
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posh_u16_t
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POSH_SwapU16( posh_u16_t v )
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{
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posh_u16_t swapped;
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swapped = v << 8;
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swapped |= v >> 8;
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return swapped;
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}
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/**
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* Byte swaps a 16-bit signed value
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*
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@ingroup ByteSwapFunctions
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@param v [in] signed 16-bit input value to swap
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@returns a byte swapped version of v
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@remarks This just calls back to the unsigned version, since byte swapping
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is independent of sign. However, we still provide this function to
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avoid signed/unsigned mismatch compiler warnings.
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*/
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posh_i16_t
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POSH_SwapI16( posh_i16_t v )
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{
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return ( posh_i16_t ) POSH_SwapU16( v );
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}
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/**
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* Byte swaps a 32-bit unsigned value
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*
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@ingroup ByteSwapFunctions
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@param v [in] unsigned 32-bit input value to swap
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@returns a byte swapped version of v
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*/
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posh_u32_t
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POSH_SwapU32( posh_u32_t v )
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{
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posh_u32_t swapped;
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swapped = ( v & 0xFF ) << 24;
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swapped |= ( v & 0xFF00 ) << 8;
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swapped |= ( v >> 8 ) & 0xFF00;
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swapped |= ( v >> 24 );
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return swapped;
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}
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/**
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* Byte swaps a 32-bit signed value
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*
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@ingroup ByteSwapFunctions
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@param v [in] signed 32-bit input value to swap
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@returns a byte swapped version of v
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@remarks This just calls back to the unsigned version, since byte swapping
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is independent of sign. However, we still provide this function to
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avoid signed/unsigned mismatch compiler warnings.
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*/
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posh_i32_t
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POSH_SwapI32( posh_i32_t v )
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{
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return ( posh_i32_t ) POSH_SwapU32( ( posh_u32_t ) v );
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}
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#if defined POSH_64BIT_INTEGER
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/**
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* Byte swaps a 64-bit unsigned value
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@param v [in] a 64-bit input value to swap
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@ingroup SixtyFourBit
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@returns a byte swapped version of v
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*/
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posh_u64_t
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POSH_SwapU64( posh_u64_t v )
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{
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posh_byte_t tmp;
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union {
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posh_byte_t bytes[ 8 ];
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posh_u64_t u64;
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} u;
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u.u64 = v;
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tmp = u.bytes[ 0 ]; u.bytes[ 0 ] = u.bytes[ 7 ]; u.bytes[ 7 ] = tmp;
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tmp = u.bytes[ 1 ]; u.bytes[ 1 ] = u.bytes[ 6 ]; u.bytes[ 6 ] = tmp;
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tmp = u.bytes[ 2 ]; u.bytes[ 2 ] = u.bytes[ 5 ]; u.bytes[ 5 ] = tmp;
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tmp = u.bytes[ 3 ]; u.bytes[ 3 ] = u.bytes[ 4 ]; u.bytes[ 4 ] = tmp;
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return u.u64;
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}
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/**
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* Byte swaps a 64-bit signed value
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@param v [in] a 64-bit input value to swap
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@ingroup SixtyFourBit
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@returns a byte swapped version of v
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*/
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posh_i64_t
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POSH_SwapI64( posh_i64_t v )
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{
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return ( posh_i64_t ) POSH_SwapU64( ( posh_u64_t ) v );
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}
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#endif /* defined POSH_64BIT_INTEGER */
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/* ---------------------------------------------------------------------------*/
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/* IN-MEMORY SERIALIZATION */
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/* ---------------------------------------------------------------------------*/
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/**
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* Writes an unsigned 16-bit value to a little endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL. Alignment doesn't matter.
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@param value [in] host-endian unsigned 16-bit value
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@returns a pointer to the location two bytes after dst
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@remarks does no validation of the inputs
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*/
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posh_u16_t *
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POSH_WriteU16ToLittle( void *dst, posh_u16_t value )
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{
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posh_u16_t *p16 = ( posh_u16_t * ) dst;
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posh_byte_t *p = ( posh_byte_t * ) dst;
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p[ 0 ] = value & 0xFF;
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p[ 1 ] = ( value & 0xFF00) >> 8;
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return p16 + 1;
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}
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/**
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* Writes a signed 16-bit value to a little endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL
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@param value [in] host-endian signed 16-bit value
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@returns a pointer to the location two bytes after dst
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@remarks does no validation of the inputs. This simply calls
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POSH_WriteU16ToLittle() with appropriate casting.
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*/
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posh_i16_t *
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POSH_WriteI16ToLittle( void *dst, posh_i16_t value )
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{
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return ( posh_i16_t * ) POSH_WriteU16ToLittle( dst, ( posh_u16_t ) value );
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}
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/**
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* Writes an unsigned 32-bit value to a little endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL
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@param value [in] host-endian signed 32-bit value
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@returns a pointer to the location four bytes after dst
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@remarks does no validation of the inputs.
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*/
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posh_u32_t *
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POSH_WriteU32ToLittle( void *dst, posh_u32_t value )
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{
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posh_u32_t *p32 = ( posh_u32_t * ) dst;
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posh_byte_t *p = ( posh_byte_t * ) dst;
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p[ 0 ] = ( value & 0xFF );
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p[ 1 ] = ( value & 0xFF00 ) >> 8;
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p[ 2 ] = ( value & 0xFF0000 ) >> 16;
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p[ 3 ] = ( value & 0xFF000000 ) >> 24;
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return p32 + 1;
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}
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/**
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* Writes a signed 32-bit value to a little endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL
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@param value [in] host-endian signed 32-bit value
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@returns a pointer to the location four bytes after dst
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@remarks does no validation of the inputs. This simply calls
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POSH_WriteU32ToLittle() with appropriate casting.
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*/
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posh_i32_t *
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POSH_WriteI32ToLittle( void *dst, posh_i32_t value )
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{
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return ( posh_i32_t * ) POSH_WriteU32ToLittle( dst, ( posh_u32_t ) value );
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}
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/**
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* Writes an unsigned 16-bit value to a big endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL
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@param value [in] host-endian unsigned 16-bit value
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@returns a pointer to the location two bytes after dst
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@remarks does no validation of the inputs
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*/
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posh_u16_t *
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POSH_WriteU16ToBig( void *dst, posh_u16_t value )
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{
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posh_u16_t *p16 = ( posh_u16_t * ) dst;
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posh_byte_t *p = ( posh_byte_t * ) dst;
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p[ 1 ] = ( value & 0xFF );
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p[ 0 ] = ( value & 0xFF00 ) >> 8;
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return p16 + 1;
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}
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/**
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* Writes a signed 16-bit value to a big endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL
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@param value [in] host-endian signed 16-bit value
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@returns a pointer to the location two bytes after dst
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@remarks does no validation of the inputs. This simply calls
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POSH_WriteU16ToLittle() with appropriate casting.
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*/
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posh_i16_t *
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POSH_WriteI16ToBig( void *dst, posh_i16_t value )
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{
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return ( posh_i16_t * ) POSH_WriteU16ToBig( dst, ( posh_u16_t ) value );
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}
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/**
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* Writes an unsigned 32-bit value to a big endian buffer
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@ingroup MemoryBuffer
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@param dst [out] pointer to the destination buffer, may not be NULL
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@param value [in] host-endian unsigned 32-bit value
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@returns a pointer to the location four bytes after dst
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@remarks does no validation of the inputs.
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*/
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posh_u32_t *
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POSH_WriteU32ToBig( void *dst, posh_u32_t value )
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{
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posh_u32_t *p32 = ( posh_u32_t * ) dst;
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posh_byte_t *p = ( posh_byte_t * ) dst;
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p[ 3 ] = ( value & 0xFF );
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p[ 2 ] = ( value & 0xFF00 ) >> 8;
|
|
p[ 1 ] = ( value & 0xFF0000 ) >> 16;
|
|
p[ 0 ] = ( value & 0xFF000000 ) >> 24;
|
|
|
|
return p32 + 1;
|
|
}
|
|
|
|
/**
|
|
* Writes a signed 32-bit value to a big endian buffer
|
|
|
|
@ingroup MemoryBuffer
|
|
@param dst [out] pointer to the destination buffer, may not be NULL
|
|
@param value [in] host-endian signed 32-bit value
|
|
@returns a pointer to the location four bytes after dst
|
|
@remarks does no validation of the inputs. This simply calls
|
|
POSH_WriteU32ToBig() with appropriate casting.
|
|
*/
|
|
posh_i32_t *
|
|
POSH_WriteI32ToBig( void *dst, posh_i32_t value )
|
|
{
|
|
return ( posh_i32_t * ) POSH_WriteU32ToBig( dst, ( posh_u32_t ) value );
|
|
}
|
|
|
|
#if defined POSH_64BIT_INTEGER
|
|
/**
|
|
* Writes an unsigned 64-bit value to a little-endian buffer
|
|
|
|
@ingroup SixtyFourBit
|
|
@param dst [out] pointer to the destination buffer, may not be NULL
|
|
@param value [in] host-endian unsigned 64-bit value
|
|
@returns a pointer to the location eight bytes after dst
|
|
@remarks does no validation of the inputs.
|
|
*/
|
|
posh_u64_t *
|
|
POSH_WriteU64ToLittle( void *dst, posh_u64_t value )
|
|
{
|
|
posh_u64_t *p64 = ( posh_u64_t * ) dst;
|
|
posh_byte_t *p = ( posh_byte_t * ) dst;
|
|
int i;
|
|
|
|
for ( i = 0; i < 8; i++, value >>= 8 )
|
|
{
|
|
p[ i ] = ( posh_byte_t ) ( value & 0xFF );
|
|
}
|
|
|
|
return p64 + 1;
|
|
}
|
|
|
|
/**
|
|
* Writes a signed 64-bit value to a little-endian buffer
|
|
|
|
@ingroup SixtyFourBit
|
|
@param dst [out] pointer to the destination buffer, may not be NULL
|
|
@param value [in] host-endian unsigned 64-bit value
|
|
@returns a pointer to the location eight bytes after dst
|
|
@remarks does no validation of the inputs.
|
|
*/
|
|
posh_i64_t *
|
|
POSH_WriteI64ToLittle( void *dst, posh_i64_t value )
|
|
{
|
|
return ( posh_i64_t * ) POSH_WriteU64ToLittle( dst, ( posh_u64_t ) value );
|
|
}
|
|
|
|
/**
|
|
* Writes an unsigned 64-bit value to a big-endian buffer
|
|
|
|
@ingroup SixtyFourBit
|
|
@param dst [out] pointer to the destination buffer, may not be NULL
|
|
@param value [in] host-endian unsigned 64-bit value
|
|
@returns a pointer to the location eight bytes after dst
|
|
@remarks does no validation of the inputs.
|
|
*/
|
|
posh_u64_t *
|
|
POSH_WriteU64ToBig( void *dst, posh_u64_t value )
|
|
{
|
|
posh_u64_t *p64 = ( posh_u64_t * ) dst;
|
|
posh_byte_t *p = ( posh_byte_t * ) dst;
|
|
int i;
|
|
|
|
for ( i = 0; i < 8; i++, value >>= 8 )
|
|
{
|
|
p[ 7-i ] = ( posh_byte_t ) ( value & 0xFF );
|
|
}
|
|
|
|
return p64 + 8;
|
|
}
|
|
|
|
/**
|
|
* Writes a signed 64-bit value to a big-endian buffer
|
|
|
|
@ingroup SixtyFourBit
|
|
@param dst [out] pointer to the destination buffer, may not be NULL
|
|
@param value [in] host-endian signed 64-bit value
|
|
@returns a pointer to the location eight bytes after dst
|
|
@remarks does no validation of the inputs.
|
|
*/
|
|
posh_i64_t *
|
|
POSH_WriteI64ToBig( void *dst, posh_i64_t value )
|
|
{
|
|
return ( posh_i64_t * ) POSH_WriteU64ToBig( dst, ( posh_u64_t ) value );
|
|
}
|
|
|
|
#endif /* POSH_64BIT_INTEGER */
|
|
|
|
/* ---------------------------------------------------------------------------*/
|
|
/* IN-MEMORY DESERIALIZATION */
|
|
/* ---------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Reads an unsigned 16-bit value from a little-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian unsigned 16-bit value
|
|
*/
|
|
posh_u16_t
|
|
POSH_ReadU16FromLittle( const void *src )
|
|
{
|
|
posh_u16_t v = 0;
|
|
posh_byte_t *p = ( posh_byte_t * ) src;
|
|
|
|
v |= p[ 0 ];
|
|
v |= ( ( posh_u16_t ) p[ 1 ] ) << 8;
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* Reads a signed 16-bit value from a little-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian signed 16-bit value
|
|
*/
|
|
posh_i16_t
|
|
POSH_ReadI16FromLittle( const void *src )
|
|
{
|
|
return ( posh_i16_t ) POSH_ReadU16FromLittle( src );
|
|
}
|
|
|
|
/**
|
|
* Reads an unsigned 32-bit value from a little-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian unsigned 32-bit value
|
|
*/
|
|
posh_u32_t
|
|
POSH_ReadU32FromLittle( const void *src )
|
|
{
|
|
posh_u32_t v = 0;
|
|
posh_byte_t *p = ( posh_byte_t * ) src;
|
|
|
|
v |= p[ 0 ];
|
|
v |= ( ( posh_u32_t ) p[ 1 ] ) << 8;
|
|
v |= ( ( posh_u32_t ) p[ 2 ] ) << 16;
|
|
v |= ( ( posh_u32_t ) p[ 3 ] ) << 24;
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* Reads a signed 32-bit value from a little-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian signed 32-bit value
|
|
*/
|
|
posh_i32_t
|
|
POSH_ReadI32FromLittle( const void *src )
|
|
{
|
|
return ( posh_i32_t ) POSH_ReadU32FromLittle( src );
|
|
}
|
|
|
|
|
|
/**
|
|
* Reads an unsigned 16-bit value from a big-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian unsigned 16-bit value
|
|
*/
|
|
posh_u16_t
|
|
POSH_ReadU16FromBig( const void *src )
|
|
{
|
|
posh_u16_t v = 0;
|
|
posh_byte_t *p = ( posh_byte_t * ) src;
|
|
|
|
v |= p[ 1 ];
|
|
v |= ( ( posh_u16_t ) p[ 0 ] ) << 8;
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* Reads a signed 16-bit value from a big-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian signed 16-bit value
|
|
*/
|
|
posh_i16_t
|
|
POSH_ReadI16FromBig( const void *src )
|
|
{
|
|
return ( posh_i16_t ) POSH_ReadU16FromBig( src );
|
|
}
|
|
|
|
/**
|
|
* Reads an unsigned 32-bit value from a big-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian unsigned 32-bit value
|
|
*/
|
|
posh_u32_t
|
|
POSH_ReadU32FromBig( const void *src )
|
|
{
|
|
posh_u32_t v = 0;
|
|
posh_byte_t *p = ( posh_byte_t * ) src;
|
|
|
|
v |= p[ 3 ];
|
|
v |= ( ( posh_u32_t ) p[ 2 ] ) << 8;
|
|
v |= ( ( posh_u32_t ) p[ 1 ] ) << 16;
|
|
v |= ( ( posh_u32_t ) p[ 0 ] ) << 24;
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* Reads a signed 32-bit value from a big-endian buffer
|
|
@ingroup MemoryBuffer
|
|
@param src [in] source buffer
|
|
@returns host-endian signed 32-bit value
|
|
*/
|
|
posh_i32_t
|
|
POSH_ReadI32FromBig( const void *src )
|
|
{
|
|
return POSH_BigI32( (*(const posh_i32_t*)src ) );
|
|
}
|
|
|
|
#if defined POSH_64BIT_INTEGER
|
|
|
|
/**
|
|
* Reads an unsigned 64-bit value from a little-endian buffer
|
|
@param src [in] source buffer
|
|
@returns host-endian unsigned 32-bit value
|
|
*/
|
|
posh_u64_t
|
|
POSH_ReadU64FromLittle( const void *src )
|
|
{
|
|
posh_u64_t v = 0;
|
|
posh_byte_t *p = ( posh_byte_t * ) src;
|
|
int i;
|
|
|
|
for ( i = 0; i < 8; i++ )
|
|
{
|
|
v |= ( ( posh_u64_t ) p[ i ] ) << (i*8);
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* Reads a signed 64-bit value from a little-endian buffer
|
|
@param src [in] source buffer
|
|
@returns host-endian signed 32-bit value
|
|
*/
|
|
posh_i64_t
|
|
POSH_ReadI64FromLittle( const void *src )
|
|
{
|
|
return ( posh_i64_t ) POSH_ReadU64FromLittle( src );
|
|
}
|
|
|
|
/**
|
|
* Reads an unsigned 64-bit value from a big-endian buffer
|
|
@param src [in] source buffer
|
|
@returns host-endian unsigned 32-bit value
|
|
*/
|
|
posh_u64_t
|
|
POSH_ReadU64FromBig( const void *src )
|
|
{
|
|
posh_u64_t v = 0;
|
|
posh_byte_t *p = ( posh_byte_t * ) src;
|
|
int i;
|
|
|
|
for ( i = 0; i < 8; i++ )
|
|
{
|
|
v |= ( ( posh_u64_t ) p[ 7-i ] ) << (i*8);
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* Reads an signed 64-bit value from a big-endian buffer
|
|
@param src [in] source buffer
|
|
@returns host-endian signed 32-bit value
|
|
*/
|
|
posh_i64_t
|
|
POSH_ReadI64FromBig( const void *src )
|
|
{
|
|
return ( posh_i64_t ) POSH_ReadU64FromBig( src );
|
|
}
|
|
|
|
#endif /* POSH_64BIT_INTEGER */
|
|
|
|
/* ---------------------------------------------------------------------------*/
|
|
/* FLOATING POINT SUPPORT */
|
|
/* ---------------------------------------------------------------------------*/
|
|
|
|
#if !defined POSH_NO_FLOAT
|
|
|
|
/** @ingroup FloatingPoint
|
|
@param[in] f floating point value
|
|
@returns a little-endian bit representation of f
|
|
*/
|
|
posh_u32_t
|
|
POSH_LittleFloatBits( float f )
|
|
{
|
|
union
|
|
{
|
|
float f32;
|
|
posh_u32_t u32;
|
|
} u;
|
|
|
|
u.f32 = f;
|
|
|
|
return POSH_LittleU32( u.u32 );
|
|
}
|
|
|
|
/**
|
|
* Extracts raw big-endian bits from a 32-bit floating point value
|
|
*
|
|
@ingroup FloatingPoint
|
|
@param f [in] floating point value
|
|
@returns a big-endian bit representation of f
|
|
*/
|
|
posh_u32_t
|
|
POSH_BigFloatBits( float f )
|
|
{
|
|
union
|
|
{
|
|
float f32;
|
|
posh_u32_t u32;
|
|
} u;
|
|
|
|
u.f32 = f;
|
|
|
|
return POSH_BigU32( u.u32 );
|
|
}
|
|
|
|
/**
|
|
* Extracts raw, little-endian bit representation from a 64-bit double.
|
|
*
|
|
@param d [in] 64-bit double precision value
|
|
@param dst [out] 8-byte storage buffer
|
|
@ingroup FloatingPoint
|
|
@returns the raw bits used to represent the value 'd', in the form dst[0]=LSB
|
|
*/
|
|
void
|
|
POSH_DoubleBits( double d, posh_byte_t dst[ 8 ] )
|
|
{
|
|
union
|
|
{
|
|
double d64;
|
|
posh_byte_t bytes[ 8 ];
|
|
} u;
|
|
|
|
u.d64 = d;
|
|
|
|
#if defined POSH_LITTLE_ENDIAN
|
|
dst[ 0 ] = u.bytes[ 0 ];
|
|
dst[ 1 ] = u.bytes[ 1 ];
|
|
dst[ 2 ] = u.bytes[ 2 ];
|
|
dst[ 3 ] = u.bytes[ 3 ];
|
|
dst[ 4 ] = u.bytes[ 4 ];
|
|
dst[ 5 ] = u.bytes[ 5 ];
|
|
dst[ 6 ] = u.bytes[ 6 ];
|
|
dst[ 7 ] = u.bytes[ 7 ];
|
|
#else
|
|
dst[ 0 ] = u.bytes[ 7 ];
|
|
dst[ 1 ] = u.bytes[ 6 ];
|
|
dst[ 2 ] = u.bytes[ 5 ];
|
|
dst[ 3 ] = u.bytes[ 4 ];
|
|
dst[ 4 ] = u.bytes[ 3 ];
|
|
dst[ 5 ] = u.bytes[ 2 ];
|
|
dst[ 6 ] = u.bytes[ 1 ];
|
|
dst[ 7 ] = u.bytes[ 0 ];
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Creates a double-precision, 64-bit floating point value from a set of raw,
|
|
* little-endian bits
|
|
|
|
@ingroup FloatingPoint
|
|
@param src [in] little-endian byte representation of 64-bit double precision
|
|
floating point value
|
|
@returns double precision floating point representation of the raw bits
|
|
@remarks No error checking is performed, so there are no guarantees that the
|
|
result is a valid number, nor is there any check to ensure that src is
|
|
non-NULL. BE CAREFUL USING THIS.
|
|
*/
|
|
double
|
|
POSH_DoubleFromBits( const posh_byte_t src[ 8 ] )
|
|
{
|
|
union
|
|
{
|
|
double d64;
|
|
posh_byte_t bytes[ 8 ];
|
|
} u;
|
|
|
|
#if defined POSH_LITTLE_ENDIAN
|
|
u.bytes[ 0 ] = src[ 0 ];
|
|
u.bytes[ 1 ] = src[ 1 ];
|
|
u.bytes[ 2 ] = src[ 2 ];
|
|
u.bytes[ 3 ] = src[ 3 ];
|
|
u.bytes[ 4 ] = src[ 4 ];
|
|
u.bytes[ 5 ] = src[ 5 ];
|
|
u.bytes[ 6 ] = src[ 6 ];
|
|
u.bytes[ 7 ] = src[ 7 ];
|
|
#else
|
|
u.bytes[ 0 ] = src[ 7 ];
|
|
u.bytes[ 1 ] = src[ 6 ];
|
|
u.bytes[ 2 ] = src[ 5 ];
|
|
u.bytes[ 3 ] = src[ 4 ];
|
|
u.bytes[ 4 ] = src[ 3 ];
|
|
u.bytes[ 5 ] = src[ 2 ];
|
|
u.bytes[ 6 ] = src[ 1 ];
|
|
u.bytes[ 7 ] = src[ 0 ];
|
|
#endif
|
|
|
|
return u.d64;
|
|
}
|
|
|
|
/**
|
|
* Creates a floating point number from little endian bits
|
|
*
|
|
@ingroup FloatingPoint
|
|
@param bits [in] raw floating point bits in little-endian form
|
|
@returns a floating point number based on the given bit representation
|
|
@remarks No error checking is performed, so there are no guarantees that the
|
|
result is a valid number. BE CAREFUL USING THIS.
|
|
*/
|
|
float
|
|
POSH_FloatFromLittleBits( posh_u32_t bits )
|
|
{
|
|
union
|
|
{
|
|
float f32;
|
|
posh_u32_t u32;
|
|
} u;
|
|
|
|
u.u32 = bits;
|
|
#if defined POSH_BIG_ENDIAN
|
|
u.u32 = POSH_SwapU32( u.u32 );
|
|
#endif
|
|
|
|
return u.f32;
|
|
}
|
|
|
|
/**
|
|
* Creates a floating point number from big-endian bits
|
|
*
|
|
@ingroup FloatingPoint
|
|
@param bits [in] raw floating point bits in big-endian form
|
|
@returns a floating point number based on the given bit representation
|
|
@remarks No error checking is performed, so there are no guarantees that the
|
|
result is a valid number. BE CAREFUL USING THIS.
|
|
*/
|
|
float
|
|
POSH_FloatFromBigBits( posh_u32_t bits )
|
|
{
|
|
union
|
|
{
|
|
float f32;
|
|
posh_u32_t u32;
|
|
} u;
|
|
|
|
u.u32 = bits;
|
|
#if defined POSH_LITTLE_ENDIAN
|
|
u.u32 = POSH_SwapU32( u.u32 );
|
|
#endif
|
|
|
|
return u.f32;
|
|
}
|
|
|
|
#endif /* !defined POSH_NO_FLOAT */
|