Bitvec.h

#pragma once

#include "pstdint.h"

#include <stdlib.h> // for _rotl, _rotr, etc.

//-----------------------------------------------------------------------------

void     printbits   ( void * blob, int len );
void     printhex32  ( void * blob, int len );
void     printbytes  ( void * blob, int len );

uint32_t getbit      ( void * blob, int len, uint32_t bit );
uint32_t getbit_wrap ( void * blob, int len, uint32_t bit );

void     setbit      ( void * blob, int len, uint32_t bit );
void     setbit      ( void * blob, int len, uint32_t bit, uint32_t val );

void     clearbit    ( void * blob, int len, uint32_t bit );

void     flipbit     ( void * blob, int len, uint32_t bit );

//----------

template< typename T >
inline uint32_t getbit ( T & blob, uint32_t bit )
{
	return getbit(&blob,sizeof(blob),bit);
}

template<> inline uint32_t getbit ( uint32_t & blob, uint32_t bit ) { return (blob >> (bit & 31)) & 1; }
template<> inline uint32_t getbit ( uint64_t & blob, uint32_t bit ) { return (blob >> (bit & 63)) & 1; }

//----------

template< typename T >
inline void setbit ( T & blob, uint32_t bit )
{
	return setbit(&blob,sizeof(blob),bit);
}

template<> inline void setbit ( uint32_t & blob, uint32_t bit ) { blob |= uint32_t(1) << (bit & 31); }
template<> inline void setbit ( uint64_t & blob, uint32_t bit ) { blob |= uint64_t(1) << (bit & 63); }

//----------

template< typename T >
inline void flipbit ( T & blob, uint32_t bit )
{
	flipbit(&blob,sizeof(blob),bit);
}

template<> inline void flipbit ( uint32_t & blob, uint32_t bit ) { bit &= 31; blob ^= (uint32_t(1) << bit); }
template<> inline void flipbit ( uint64_t & blob, uint32_t bit ) { bit &= 63; blob ^= (uint64_t(1) << bit); }

//-----------------------------------------------------------------------------
// Left and right shift of blobs. The shift(N) versions work on chunks of N
// bits at a time (faster)

void lshift1  ( void * blob, int len, int c );
void lshift8  ( void * blob, int len, int c );
void lshift32 ( void * blob, int len, int c );

void rshift1  ( void * blob, int len, int c );
void rshift8  ( void * blob, int len, int c );
void rshift32 ( void * blob, int len, int c );

inline void lshift ( void * blob, int len, int c )
{
	if((len & 3) == 0)
	{
		lshift32(blob,len,c);
	}
	else
	{
		lshift8(blob,len,c);
	}
}

inline void rshift ( void * blob, int len, int c )
{
	if((len & 3) == 0)
	{
		rshift32(blob,len,c);
	}
	else
	{
		rshift8(blob,len,c);
	}
}

template < typename T >
inline void lshift ( T & blob, int c )
{
	if((sizeof(T) & 3) == 0)
	{
		lshift32(&blob,sizeof(T),c);
	}
	else
	{
		lshift8(&blob,sizeof(T),c);
	}
}

template < typename T >
inline void rshift ( T & blob, int c )
{
	if((sizeof(T) & 3) == 0)
	{
		lshift32(&blob,sizeof(T),c);
	}
	else
	{
		lshift8(&blob,sizeof(T),c);
	}
}

template<> inline void lshift ( uint32_t & blob, int c ) { blob <<= c; }
template<> inline void lshift ( uint64_t & blob, int c ) { blob <<= c; }
template<> inline void rshift ( uint32_t & blob, int c ) { blob >>= c; }
template<> inline void rshift ( uint64_t & blob, int c ) { blob >>= c; }

//-----------------------------------------------------------------------------
// Left and right rotate of blobs. The rot(N) versions work on chunks of N
// bits at a time (faster)

void lrot1    ( void * blob, int len, int c );
void lrot8    ( void * blob, int len, int c );
void lrot32   ( void * blob, int len, int c );

void rrot1    ( void * blob, int len, int c );
void rrot8    ( void * blob, int len, int c );
void rrot32   ( void * blob, int len, int c );

inline void lrot ( void * blob, int len, int c )
{
	if((len & 3) == 0)
	{
		return lrot32(blob,len,c);
	}
	else
	{
		return lrot8(blob,len,c);
	}
}

inline void rrot ( void * blob, int len, int c )
{
	if((len & 3) == 0)
	{
		return rrot32(blob,len,c);
	}
	else
	{
		return rrot8(blob,len,c);
	}
}

template < typename T >
inline void lrot ( T & blob, int c )
{
	if((sizeof(T) & 3) == 0)
	{
		return lrot32(&blob,sizeof(T),c);
	}
	else
	{
		return lrot8(&blob,sizeof(T),c);
	}
}

template < typename T >
inline void rrot ( T & blob, int c )
{
	if((sizeof(T) & 3) == 0)
	{
		return rrot32(&blob,sizeof(T),c);
	}
	else
	{
		return rrot8(&blob,sizeof(T),c);
	}
}

template<> inline void lrot ( uint32_t & blob, int c ) { blob = _rotl(blob,c); }
template<> inline void lrot ( uint64_t & blob, int c ) { blob = _rotl64(blob,c); }
template<> inline void rrot ( uint32_t & blob, int c ) { blob = _rotr(blob,c); }
template<> inline void rrot ( uint64_t & blob, int c ) { blob = _rotr64(blob,c); }

//-----------------------------------------------------------------------------
// Bit-windowing functions - select some N-bit subset of the input blob

uint32_t window1  ( void * blob, int len, int start, int count );
uint32_t window8  ( void * blob, int len, int start, int count );
uint32_t window32 ( void * blob, int len, int start, int count );

inline uint32_t window ( void * blob, int len, int start, int count )
{
	if(len & 3)
	{
		return window8(blob,len,start,count);
	}
	else
	{
		return window32(blob,len,start,count);
	}
}

template < typename T >
inline uint32_t window ( T & blob, int start, int count )
{
	if((sizeof(T) & 3) == 0)
	{
		return window32(&blob,sizeof(T),start,count);
	}
	else
	{
		return window8(&blob,sizeof(T),start,count);
	}
}

template<> 
inline uint32_t window ( uint32_t & blob, int start, int count )
{
	return _rotr(blob,start) & ((1<<count)-1);
}

template<> 
inline uint32_t window ( uint64_t & blob, int start, int count )
{
	return (uint32_t)_rotr64(blob,start) & ((1<<count)-1);
}

//-----------------------------------------------------------------------------