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Diffstat (limited to 'thirdparty/thekla_atlas/poshlib/posh.c')
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diff --git a/thirdparty/thekla_atlas/poshlib/posh.c b/thirdparty/thekla_atlas/poshlib/posh.c new file mode 100644 index 0000000000..bd3fcc66ea --- /dev/null +++ b/thirdparty/thekla_atlas/poshlib/posh.c @@ -0,0 +1,1006 @@ +/* +LICENSE: + +Copyright (c) 2004, Brian Hook +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + * 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. + + * The names of this package'ss contributors contributors may not + be used to endorse or promote products derived from this + software without specific prior written permission. + + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 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. +*/ +/** + @file posh.c + @author Brian Hook + @date 2002 + @brief Portable Open Source Harness primary source file +*/ +#include "posh.h" + +#if !defined FORCE_DOXYGEN + +#if !defined POSH_NO_FLOAT +# define POSH_FLOAT_STRING "enabled" +#else +# define POSH_FLOAT_STRING "disabled" +#endif + +#if defined POSH_64BIT_INTEGER +# define POSH_64BIT_INTEGER_STRING "yes" +#else +# define POSH_64BIT_INTEGER_STRING "no" +#endif + +#if defined POSH_64BIT_POINTER +# define POSH_POINTER_STRING "64-bits" +#else +# define POSH_POINTER_STRING "32-bits" +#endif + +#if defined POSH_LITTLE_ENDIAN +# define IS_BIG_ENDIAN 0 + +# define NATIVE16 POSH_LittleU16 +# define NATIVE32 POSH_LittleU32 +# define NATIVE64 POSH_LittleU64 +# define FOREIGN16 POSH_BigU16 +# define FOREIGN32 POSH_BigU32 +# define FOREIGN64 POSH_BigU64 +#else +# define IS_BIG_ENDIAN 1 + +# define NATIVE16 POSH_BigU16 +# define NATIVE32 POSH_BigU32 +# define NATIVE64 POSH_BigU64 +# define FOREIGN16 POSH_LittleU16 +# define FOREIGN32 POSH_LittleU32 +# define FOREIGN64 POSH_LittleU64 +#endif /* POSH_LITTLE_ENDIAN */ + +static +int +s_testBigEndian( void ) +{ + union + { + posh_byte_t c[ 4 ]; + posh_u32_t i; + } u; + + u.i= 1; + + if ( u.c[ 0 ] == 1 ) + { + return 0; + } + return 1; +} + +static +const char * +s_testSerialization( void ) +{ + posh_byte_t serbuf[ 8 ]; + posh_u16_t tmp16; + posh_u32_t tmp32; + + /* 16-bit serialization */ + POSH_WriteU16ToLittle( serbuf, 0xABCD ); + if ( ( tmp16 = POSH_ReadU16FromLittle( serbuf ) ) != 0xABCD ) + { + return "*ERROR: failed little-endian 16-bit serialization test"; + } + + POSH_WriteU16ToBig( serbuf, 0xABCD ); + if ( ( tmp16 = POSH_ReadU16FromBig( serbuf ) ) != 0xABCD ) + { + return "*ERROR: failed big-endian 16-bit serialization test"; + } + + /* 32-bit serialization */ + POSH_WriteU32ToLittle( serbuf, 0xABCD1234L ); + if ( ( tmp32 = POSH_ReadU32FromLittle( serbuf ) ) != 0xABCD1234 ) + { + return "*ERROR: failed little-endian 32-bit serialization test"; + } + + POSH_WriteU32ToBig( serbuf, 0xABCD1234L ); + if ( ( tmp32 = POSH_ReadU32FromBig( serbuf ) ) != 0xABCD1234 ) + { + return "*ERROR: failed big-endian 32-bit serialization test"; + } + +#if defined POSH_64BIT_INTEGER + { +#define REF64 POSH_U64(0xFEDCBA9876543210) + + posh_u64_t tmp64; + + POSH_WriteU64ToLittle( serbuf, REF64 ); + + if ( ( tmp64 = POSH_ReadU64FromLittle( serbuf ) ) != REF64 ) + { + return "*ERROR: failed little-endian 64-bit serialization test"; + } + + POSH_WriteU64ToBig( serbuf, REF64 ); + + if ( ( tmp64 = POSH_ReadU64FromBig( serbuf ) ) != REF64 ) + { + return "*ERROR: failed big-endian 64-bit serialization test"; + } + } +#endif + + return 0; +} + +#if !defined POSH_NO_FLOAT +static +const char * +s_testFloatingPoint( void ) +{ + float fRef = 10.0f/30.0f; + double dRef = 10.0/30.0; + posh_byte_t dbuf[ 8 ]; + float fTmp; + double dTmp; + + fTmp = POSH_FloatFromLittleBits( POSH_LittleFloatBits( fRef ) ); + + if ( fTmp != fRef ) + { + return "*ERROR: POSH little endian floating point conversion failed. Please report this to poshlib@poshlib.org!\n"; + } + + fTmp = POSH_FloatFromBigBits( POSH_BigFloatBits( fRef ) ); + if ( fTmp != fRef ) + { + return "*ERROR: POSH big endian floating point conversion failed. Please report this to poshlib@poshlib.org!\n"; + } + + POSH_DoubleBits( dRef, dbuf ); + + dTmp = POSH_DoubleFromBits( dbuf ); + + if ( dTmp != dRef ) + { + return "*ERROR: POSH double precision floating point serialization failed. Please report this to poshlib@poshlib.org!\n"; + } + + return 0; +} +#endif /* !defined POSH_NO_FLOAT */ + +static +const char * +s_testEndianess( void ) +{ + /* check endianess */ + if ( s_testBigEndian() != IS_BIG_ENDIAN ) + { + return "*ERROR: POSH compile time endianess does not match run-time endianess verification. Please report this to poshlib@poshlib.org!\n"; + } + + /* make sure our endian swap routines work */ + if ( ( NATIVE32( 0x11223344L ) != 0x11223344L ) || + ( FOREIGN32( 0x11223344L ) != 0x44332211L ) || + ( NATIVE16( 0x1234 ) != 0x1234 ) || + ( FOREIGN16( 0x1234 ) != 0x3412 ) ) + { + return "*ERROR: POSH endianess macro selection failed. Please report this to poshlib@poshlib.org!\n"; + } + + /* test serialization routines */ + + return 0; +} +#endif /* !defined FORCE_DOXYGEN */ + +/** + Returns a string describing this platform's basic attributes. + + POSH_GetArchString() reports on an architecture's statically determined + attributes. In addition, it will perform run-time verification checks + to make sure the various platform specific functions work. If an error + occurs, please contact me at poshlib@poshlib.org so we can try to resolve + what the specific failure case is. + @returns a string describing this platform on success, or a string in the + form "*ERROR: [text]" on failure. You can simply check to see if + the first character returned is '*' to verify an error condition. +*/ +const char * +POSH_GetArchString( void ) +{ + const char *err; + const char *s = "OS:.............."POSH_OS_STRING"\n" + "CPU:............."POSH_CPU_STRING"\n" + "endian:.........."POSH_ENDIAN_STRING"\n" + "ptr size:........"POSH_POINTER_STRING"\n" + "64-bit ints......"POSH_64BIT_INTEGER_STRING"\n" + "floating point..."POSH_FLOAT_STRING"\n" + "compiler........."POSH_COMPILER_STRING"\n"; + + /* test endianess */ + err = s_testEndianess(); + + if ( err != 0 ) + { + return err; + } + + /* test serialization */ + err = s_testSerialization(); + + if ( err != 0 ) + { + return err; + } + +#if !defined POSH_NO_FLOAT + /* check that our floating point support is correct */ + err = s_testFloatingPoint(); + + if ( err != 0 ) + { + return err; + } + +#endif + + return s; +} + +/* ---------------------------------------------------------------------------*/ +/* BYTE SWAPPING SUPPORT */ +/* ---------------------------------------------------------------------------*/ +/** + * Byte swaps a 16-bit unsigned value + * + @ingroup ByteSwapFunctions + @param v [in] unsigned 16-bit input value to swap + @returns a byte swapped version of v + */ +posh_u16_t +POSH_SwapU16( posh_u16_t v ) +{ + posh_u16_t swapped; + + swapped = v << 8; + swapped |= v >> 8; + + return swapped; +} + +/** + * Byte swaps a 16-bit signed value + * + @ingroup ByteSwapFunctions + @param v [in] signed 16-bit input value to swap + @returns a byte swapped version of v + @remarks This just calls back to the unsigned version, since byte swapping + is independent of sign. However, we still provide this function to + avoid signed/unsigned mismatch compiler warnings. + */ +posh_i16_t +POSH_SwapI16( posh_i16_t v ) +{ + return ( posh_i16_t ) POSH_SwapU16( v ); +} + +/** + * Byte swaps a 32-bit unsigned value + * + @ingroup ByteSwapFunctions + @param v [in] unsigned 32-bit input value to swap + @returns a byte swapped version of v + */ +posh_u32_t +POSH_SwapU32( posh_u32_t v ) +{ + posh_u32_t swapped; + + swapped = ( v & 0xFF ) << 24; + swapped |= ( v & 0xFF00 ) << 8; + swapped |= ( v >> 8 ) & 0xFF00; + swapped |= ( v >> 24 ); + + return swapped; +} + +/** + * Byte swaps a 32-bit signed value + * + @ingroup ByteSwapFunctions + @param v [in] signed 32-bit input value to swap + @returns a byte swapped version of v + @remarks This just calls back to the unsigned version, since byte swapping + is independent of sign. However, we still provide this function to + avoid signed/unsigned mismatch compiler warnings. + */ +posh_i32_t +POSH_SwapI32( posh_i32_t v ) +{ + return ( posh_i32_t ) POSH_SwapU32( ( posh_u32_t ) v ); +} + +#if defined POSH_64BIT_INTEGER +/** + * Byte swaps a 64-bit unsigned value + + @param v [in] a 64-bit input value to swap + @ingroup SixtyFourBit + @returns a byte swapped version of v +*/ +posh_u64_t +POSH_SwapU64( posh_u64_t v ) +{ + posh_byte_t tmp; + union { + posh_byte_t bytes[ 8 ]; + posh_u64_t u64; + } u; + + u.u64 = v; + + tmp = u.bytes[ 0 ]; u.bytes[ 0 ] = u.bytes[ 7 ]; u.bytes[ 7 ] = tmp; + tmp = u.bytes[ 1 ]; u.bytes[ 1 ] = u.bytes[ 6 ]; u.bytes[ 6 ] = tmp; + tmp = u.bytes[ 2 ]; u.bytes[ 2 ] = u.bytes[ 5 ]; u.bytes[ 5 ] = tmp; + tmp = u.bytes[ 3 ]; u.bytes[ 3 ] = u.bytes[ 4 ]; u.bytes[ 4 ] = tmp; + + return u.u64; +} + +/** + * Byte swaps a 64-bit signed value + + @param v [in] a 64-bit input value to swap + @ingroup SixtyFourBit + @returns a byte swapped version of v +*/ +posh_i64_t +POSH_SwapI64( posh_i64_t v ) +{ + return ( posh_i64_t ) POSH_SwapU64( ( posh_u64_t ) v ); +} + +#endif /* defined POSH_64BIT_INTEGER */ + +/* ---------------------------------------------------------------------------*/ +/* IN-MEMORY SERIALIZATION */ +/* ---------------------------------------------------------------------------*/ + +/** + * Writes an unsigned 16-bit value to a little endian buffer + + @ingroup MemoryBuffer + @param dst [out] pointer to the destination buffer, may not be NULL. Alignment doesn't matter. + @param value [in] host-endian unsigned 16-bit value + @returns a pointer to the location two bytes after dst + @remarks does no validation of the inputs +*/ +posh_u16_t * +POSH_WriteU16ToLittle( void *dst, posh_u16_t value ) +{ + posh_u16_t *p16 = ( posh_u16_t * ) dst; + posh_byte_t *p = ( posh_byte_t * ) dst; + + p[ 0 ] = value & 0xFF; + p[ 1 ] = ( value & 0xFF00) >> 8; + + return p16 + 1; +} + +/** + * Writes a signed 16-bit value to a little endian buffer + + @ingroup MemoryBuffer + @param dst [out] pointer to the destination buffer, may not be NULL + @param value [in] host-endian signed 16-bit value + @returns a pointer to the location two bytes after dst + @remarks does no validation of the inputs. This simply calls + POSH_WriteU16ToLittle() with appropriate casting. +*/ +posh_i16_t * +POSH_WriteI16ToLittle( void *dst, posh_i16_t value ) +{ + return ( posh_i16_t * ) POSH_WriteU16ToLittle( dst, ( posh_u16_t ) value ); +} + +/** + * Writes an unsigned 32-bit value to a little 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. +*/ +posh_u32_t * +POSH_WriteU32ToLittle( void *dst, posh_u32_t value ) +{ + posh_u32_t *p32 = ( posh_u32_t * ) dst; + posh_byte_t *p = ( posh_byte_t * ) dst; + + p[ 0 ] = ( value & 0xFF ); + p[ 1 ] = ( value & 0xFF00 ) >> 8; + p[ 2 ] = ( value & 0xFF0000 ) >> 16; + p[ 3 ] = ( value & 0xFF000000 ) >> 24; + + return p32 + 1; +} + +/** + * Writes a signed 32-bit value to a little 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_WriteU32ToLittle() with appropriate casting. +*/ +posh_i32_t * +POSH_WriteI32ToLittle( void *dst, posh_i32_t value ) +{ + return ( posh_i32_t * ) POSH_WriteU32ToLittle( dst, ( posh_u32_t ) value ); +} + +/** + * Writes an unsigned 16-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 unsigned 16-bit value + @returns a pointer to the location two bytes after dst + @remarks does no validation of the inputs +*/ +posh_u16_t * +POSH_WriteU16ToBig( void *dst, posh_u16_t value ) +{ + posh_u16_t *p16 = ( posh_u16_t * ) dst; + posh_byte_t *p = ( posh_byte_t * ) dst; + + p[ 1 ] = ( value & 0xFF ); + p[ 0 ] = ( value & 0xFF00 ) >> 8; + + return p16 + 1; +} + +/** + * Writes a signed 16-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 16-bit value + @returns a pointer to the location two bytes after dst + @remarks does no validation of the inputs. This simply calls + POSH_WriteU16ToLittle() with appropriate casting. +*/ +posh_i16_t * +POSH_WriteI16ToBig( void *dst, posh_i16_t value ) +{ + return ( posh_i16_t * ) POSH_WriteU16ToBig( dst, ( posh_u16_t ) value ); +} + +/** + * Writes an unsigned 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 unsigned 32-bit value + @returns a pointer to the location four bytes after dst + @remarks does no validation of the inputs. +*/ +posh_u32_t * +POSH_WriteU32ToBig( void *dst, posh_u32_t value ) +{ + posh_u32_t *p32 = ( posh_u32_t * ) dst; + posh_byte_t *p = ( posh_byte_t * ) dst; + + p[ 3 ] = ( value & 0xFF ); + 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 */ |