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Annotation of embedaddon/rsync/byteorder.h, revision 1.1.1.3

1.1       misho       1: /*
                      2:  * Simple byteorder handling.
                      3:  *
                      4:  * Copyright (C) 1992-1995 Andrew Tridgell
1.1.1.3 ! misho       5:  * Copyright (C) 2007-2015 Wayne Davison
1.1       misho       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. */
1.1.1.3 ! misho      26: #if defined __i386__ || defined __i486__ || defined __i586__ || defined __i686__ || __amd64
1.1       misho      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)
1.1.1.3 ! misho      41: #define IVAL64(buf,pos) (IVAL(buf,pos)|(int64)IVAL(buf,(pos)+4)<<32)
1.1       misho      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))
1.1.1.3 ! misho      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))
1.1       misho      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);
1.1.1.3 ! misho      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;
1.1       misho     120: }
                    121: 
                    122: # endif /* !AVOID_BYTEORDER_INLINE */
                    123: 
                    124: #endif /* !CAREFUL_ALIGNMENT */