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/***************************************************************************
sidendian.h - Improtant endian functions
-------------------
begin : Mon Jul 3 2000
copyright : (C) 2000 by Simon White
email : s_a_white@email.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/***************************************************************************
* $Log: sidendian.h,v $
* Revision 1.5 2001/07/03 22:44:13 s_a_white
* Added endian_16 to convert a 16 bit value to an array of 8s.
*
* Revision 1.4 2001/05/07 16:27:24 s_a_white
* Fix optimisation issues with gcc 2.96.
*
* Revision 1.3 2001/03/25 19:46:12 s_a_white
* _endian_h_ changed to _sidendian_h_.
*
* Revision 1.2 2001/03/10 19:49:32 s_a_white
* Removed bad include.
*
* Revision 1.1 2001/03/02 19:04:38 s_a_white
* Include structure modified for better compatibility
*
* Revision 1.5 2001/01/07 16:01:33 s_a_white
* sidendian.h is now installed, therefore endian defines updated.
*
* Revision 1.4 2000/12/13 17:53:01 s_a_white
* Fixes some of the endian calls.
*
* Revision 1.3 2000/12/12 19:39:15 s_a_white
* Removed bad const.
*
* Revision 1.2 2000/12/11 19:10:59 s_a_white
* AC99 Update.
*
***************************************************************************/
#ifndef _sidendian_h_
#define _sidendian_h_
// NOTE: The optimisations in this file rely on the structure of memory
// e.g. 2 shorts being contained in 1 long. Although these sizes are
// checked to make sure the optimisation is ok, gcc 2.96 (and above)
// introduced better optimisations. This results in caching of values
// in internal registers and therefore writes to ram through the aliases
// not being reflected in the CPU regs. The use of the volatile keyword
// fixes this.
#include "sidtypes.h"
#if defined(SID_WORDS_BIGENDIAN)
/* byte-order: HIHI..3210..LO */
#elif defined(SID_WORDS_LITTLEENDIAN)
/* byte-order: LO..0123..HIHI */
#else
#error Please check source code configuration!
#endif
/*
Labeling:
0 - LO
1 - HI
2 - HILO
3 - HIHI
*/
///////////////////////////////////////////////////////////////////
// INT16 FUNCTIONS
///////////////////////////////////////////////////////////////////
// Set the lo byte (8 bit) in a word (16 bit)
inline void endian_16lo8 (uint_least16_t &word, uint8_t byte)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
((volatile uint8_t *) &word)[0] = byte;
# else
((volatile uint8_t *) &word)[1] = byte;
# endif
word = *((volatile uint_least16_t *) &word);
#else
word &= 0xff00;
word |= byte;
#endif
}
// Get the lo byte (8 bit) in a word (16 bit)
inline uint8_t endian_16lo8 (uint_least16_t word)
{
return (uint8_t) word;
}
// Set the hi byte (8 bit) in a word (16 bit)
inline void endian_16hi8 (uint_least16_t &word, uint8_t byte)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
((volatile uint8_t *) &word)[1] = byte;
# else
((volatile uint8_t *) &word)[0] = byte;
# endif
word = *((volatile uint_least16_t *) &word);
#else
word &= 0x00ff;
word |= (uint_least16_t) byte << 8;
#endif
}
// Set the hi byte (8 bit) in a word (16 bit)
inline uint8_t endian_16hi8 (uint_least16_t word)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
return ((uint8_t *) &word)[1];
# else
return ((uint8_t *) &word)[0];
# endif
#else
return (uint8_t) (word >> 8);
#endif
}
// Swap word endian.
inline void endian_16swap8 (uint_least16_t &word)
{
uint8_t lo = endian_16lo8 (word);
uint8_t hi = endian_16hi8 (word);
endian_16lo8 (word, hi);
endian_16hi8 (word, lo);
}
// Convert high-byte and low-byte to 16-bit word.
inline uint_least16_t endian_16 (uint8_t hi, uint8_t lo)
{
uint_least16_t word;
endian_16lo8 (word, lo);
endian_16hi8 (word, hi);
return word;
}
// Convert high-byte and low-byte to 16-bit little endian word.
inline void endian_16 (uint8_t ptr[2], uint_least16_t word)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
*((uint_least16_t *) ptr) = word;
#else
# if defined(SID_WORDS_BIGENDIAN)
ptr[0] = endian_16hi8 (word);
ptr[1] = endian_16lo8 (word);
# else
ptr[0] = endian_16lo8 (word);
ptr[1] = endian_16hi8 (word);
# endif
#endif
}
inline void endian_16 (char ptr[2], uint_least16_t word)
{
endian_16 ((uint8_t *) ptr, word);
}
// Convert high-byte and low-byte to 16-bit little endian word.
inline uint_least16_t endian_little16 (const uint8_t ptr[2])
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_LITTLEENDIAN)
return *((uint_least16_t *) ptr);
#else
return endian_16 (ptr[1], ptr[0]);
#endif
}
// Write a little-endian 16-bit word to two bytes in memory.
inline void endian_little16 (uint8_t ptr[2], uint_least16_t word)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_LITTLEENDIAN)
*((uint_least16_t *) ptr) = word;
#else
ptr[0] = endian_16lo8 (word);
ptr[1] = endian_16hi8 (word);
#endif
}
// Convert high-byte and low-byte to 16-bit big endian word.
inline uint_least16_t endian_big16 (const uint8_t ptr[2])
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_BIGENDIAN)
return *((uint_least16_t *) ptr);
#else
return endian_16 (ptr[0], ptr[1]);
#endif
}
// Write a little-big 16-bit word to two bytes in memory.
inline void endian_big16 (uint8_t ptr[2], uint_least16_t word)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_BIGENDIAN)
*((uint_least16_t *) ptr) = word;
#else
ptr[0] = endian_16hi8 (word);
ptr[1] = endian_16lo8 (word);
#endif
}
///////////////////////////////////////////////////////////////////
// INT32 FUNCTIONS
///////////////////////////////////////////////////////////////////
// Set the lo word (16bit) in a dword (32 bit)
inline void endian_32lo16 (uint_least32_t &dword, uint_least16_t word)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
((volatile uint_least16_t *) &dword)[0] = word;
# else
((volatile uint_least16_t *) &dword)[1] = word;
# endif
dword = *((volatile uint_least32_t *) &dword);
#else
dword &= (uint_least32_t) 0xffff0000;
dword |= word;
#endif
}
// Get the lo word (16bit) in a dword (32 bit)
inline uint_least16_t endian_32lo16 (uint_least32_t dword)
{
return (uint_least16_t) dword & 0xffff;
}
// Set the hi word (16bit) in a dword (32 bit)
inline void endian_32hi16 (uint_least32_t &dword, uint_least16_t word)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
((volatile uint_least16_t *) &dword)[1] = word;
# else
((volatile uint_least16_t *) &dword)[0] = word;
# endif
dword = *((volatile uint_least32_t *) &dword);
#else
dword &= (uint_least32_t) 0x0000ffff;
dword |= (uint_least32_t) word << 16;
#endif
}
// Get the hi word (16bit) in a dword (32 bit)
inline uint_least16_t endian_32hi16 (uint_least32_t dword)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
return ((uint_least16_t *) &dword)[1];
# else
return ((uint_least16_t *) &dword)[0];
# endif
#else
return (uint_least16_t) (dword >> 16);
#endif
}
// Set the lo byte (8 bit) in a dword (32 bit)
inline void endian_32lo8 (uint_least32_t &dword, uint8_t byte)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
((volatile uint8_t *) &dword)[0] = byte;
# else
((volatile uint8_t *) &dword)[3] = byte;
# endif
dword = *((volatile uint_least32_t *) &dword);
#else
dword &= (uint_least32_t) 0xffffff00;
dword |= (uint_least32_t) byte;
#endif
}
// Get the lo byte (8 bit) in a dword (32 bit)
inline uint8_t endian_32lo8 (uint_least32_t dword)
{
return (uint8_t) dword;
}
// Set the hi byte (8 bit) in a dword (32 bit)
inline void endian_32hi8 (uint_least32_t &dword, uint8_t byte)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
((volatile uint8_t *) &dword)[1] = byte;
# else
((volatile uint8_t *) &dword)[2] = byte;
# endif
dword = *((volatile uint_least32_t *) &dword);
#else
dword &= (uint_least32_t) 0xffff00ff;
dword |= (uint_least32_t) byte << 8;
#endif
}
// Get the hi byte (8 bit) in a dword (32 bit)
inline uint8_t endian_32hi8 (uint_least32_t dword)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS)
# if defined(SID_WORDS_LITTLEENDIAN)
return ((uint8_t *) &dword)[1];
# else
return ((uint8_t *) &dword)[2];
# endif
#else
return (uint8_t) (dword >> 8);
#endif
}
// Swap hi and lo words endian in 32 bit dword.
inline void endian_32swap16 (uint_least32_t &dword)
{
uint_least16_t lo = endian_32lo16 (dword);
uint_least16_t hi = endian_32hi16 (dword);
endian_32lo16 (dword, hi);
endian_32hi16 (dword, lo);
}
// Swap word endian.
inline void endian_32swap8 (uint_least32_t &dword)
{
uint_least16_t lo, hi;
lo = endian_32lo16 (dword);
hi = endian_32hi16 (dword);
endian_16swap8 (lo);
endian_16swap8 (hi);
endian_32lo16 (dword, hi);
endian_32hi16 (dword, lo);
}
// Convert high-byte and low-byte to 32-bit word.
inline uint_least32_t endian_32 (uint8_t hihi, uint8_t hilo, uint8_t hi, uint8_t lo)
{
uint_least32_t dword;
uint_least16_t word;
endian_32lo8 (dword, lo);
endian_32hi8 (dword, hi);
endian_16lo8 (word, hilo);
endian_16hi8 (word, hihi);
endian_32hi16 (dword, word);
return dword;
}
// Convert high-byte and low-byte to 32-bit little endian word.
inline uint_least32_t endian_little32 (const uint8_t ptr[4])
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_LITTLEENDIAN)
return *((uint_least32_t *) ptr);
#else
return endian_32 (ptr[3], ptr[2], ptr[1], ptr[0]);
#endif
}
// Write a little-endian 32-bit word to four bytes in memory.
inline void endian_little32 (uint8_t ptr[4], uint_least32_t dword)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_LITTLEENDIAN)
*((uint_least32_t *) ptr) = dword;
#else
uint_least16_t word;
ptr[0] = endian_32lo8 (dword);
ptr[1] = endian_32hi8 (dword);
word = endian_32hi16 (dword);
ptr[2] = endian_16lo8 (word);
ptr[3] = endian_16hi8 (word);
#endif
}
// Convert high-byte and low-byte to 32-bit big endian word.
inline uint_least32_t endian_big32 (const uint8_t ptr[4])
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_BIGENDIAN)
return *((uint_least32_t *) ptr);
#else
return endian_32 (ptr[0], ptr[1], ptr[2], ptr[3]);
#endif
}
// Write a big-endian 32-bit word to four bytes in memory.
inline void endian_big32 (uint8_t ptr[4], uint_least32_t dword)
{
#if defined(SID_OPTIMISE_MEMORY_ACCESS) && \
defined(SID_WORDS_BIGENDIAN)
*((uint_least32_t *) ptr) = dword;
#else
uint_least16_t word;
word = endian_32hi16 (dword);
ptr[1] = endian_16lo8 (word);
ptr[0] = endian_16hi8 (word);
ptr[2] = endian_32hi8 (dword);
ptr[3] = endian_32lo8 (dword);
#endif
}
#endif // _sidendian_h_
|
