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rsync 3.1.2

    1: /*
    2:  * Simple byteorder handling.
    3:  *
    4:  * Copyright (C) 1992-1995 Andrew Tridgell
    5:  * Copyright (C) 2007-2015 Wayne Davison
    6:  *
    7:  * This program is free software; you can redistribute it and/or modify
    8:  * it under the terms of the GNU General Public License as published by
    9:  * the Free Software Foundation; either version 3 of the License, or
   10:  * (at your option) any later version.
   11:  *
   12:  * This program is distributed in the hope that it will be useful,
   13:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:  * GNU General Public License for more details.
   16:  *
   17:  * You should have received a copy of the GNU General Public License along
   18:  * with this program; if not, visit the http://fsf.org website.
   19:  */
   20: 
   21: #undef CAREFUL_ALIGNMENT
   22: #undef AVOID_BYTEORDER_INLINE
   23: 
   24: /* We know that the x86 can handle misalignment and has the same
   25:  * byte order (LSB-first) as the 32-bit numbers we transmit. */
   26: #if defined __i386__ || defined __i486__ || defined __i586__ || defined __i686__ || __amd64
   27: #define CAREFUL_ALIGNMENT 0
   28: #endif
   29: 
   30: #ifndef CAREFUL_ALIGNMENT
   31: #define CAREFUL_ALIGNMENT 1
   32: #endif
   33: 
   34: #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
   35: #define UVAL(buf,pos) ((uint32)CVAL(buf,pos))
   36: 
   37: #if CAREFUL_ALIGNMENT
   38: 
   39: #define PVAL(buf,pos) (UVAL(buf,pos)|UVAL(buf,(pos)+1)<<8)
   40: #define IVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+2)<<16)
   41: #define IVAL64(buf,pos) (IVAL(buf,pos)|(int64)IVAL(buf,(pos)+4)<<32)
   42: #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
   43: #define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16))
   44: #define SIVAL(buf,pos,val) SIVALX(buf,pos,(uint32)(val))
   45: #define SIVAL64(buf,pos,val) (SIVAL(buf,pos,val),SIVAL(buf,(pos)+4,(val)>>32))
   46: 
   47: #define IVALu(buf,pos) IVAL(buf,pos)
   48: #define SIVALu(buf,pos,val) SIVAL(buf,pos,val)
   49: 
   50: #else /* !CAREFUL_ALIGNMENT */
   51: 
   52: /* This handles things for architectures like the 386 that can handle alignment errors.
   53:  * WARNING: This section is dependent on the length of an int32 (and thus a uint32)
   54:  * being correct (4 bytes)!  Set CAREFUL_ALIGNMENT if it is not. */
   55: 
   56: # ifdef AVOID_BYTEORDER_INLINE
   57: 
   58: #define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos)))
   59: #define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val))
   60: 
   61: #define IVALu(buf,pos) IVAL(buf,pos)
   62: #define SIVALu(buf,pos,val) SIVAL(buf,pos,val)
   63: 
   64: # else /* !AVOID_BYTEORDER_INLINE */
   65: 
   66: static inline uint32
   67: IVALu(const uchar *buf, int pos)
   68: {
   69: 	union {
   70: 		const uchar *b;
   71: 		const uint32 *num;
   72: 	} u;
   73: 	u.b = buf + pos;
   74: 	return *u.num;
   75: }
   76: 
   77: static inline void
   78: SIVALu(uchar *buf, int pos, uint32 val)
   79: {
   80: 	union {
   81: 		uchar *b;
   82: 		uint32 *num;
   83: 	} u;
   84: 	u.b = buf + pos;
   85: 	*u.num = val;
   86: }
   87: 
   88: static inline uint32
   89: IVAL(const char *buf, int pos)
   90: {
   91: 	return IVALu((uchar*)buf, pos);
   92: }
   93: 
   94: static inline void
   95: SIVAL(char *buf, int pos, uint32 val)
   96: {
   97: 	SIVALu((uchar*)buf, pos, val);
   98: }
   99: 
  100: static inline int64
  101: IVAL64(const char *buf, int pos)
  102: {
  103: 	union {
  104: 		const char *b;
  105: 		const int64 *num;
  106: 	} u;
  107: 	u.b = buf + pos;
  108: 	return *u.num;
  109: }
  110: 
  111: static inline void
  112: SIVAL64(char *buf, int pos, int64 val)
  113: {
  114: 	union {
  115: 		char *b;
  116: 		int64 *num;
  117: 	} u;
  118: 	u.b = buf + pos;
  119: 	*u.num = val;
  120: }
  121: 
  122: # endif /* !AVOID_BYTEORDER_INLINE */
  123: 
  124: #endif /* !CAREFUL_ALIGNMENT */