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Annotation of embedaddon/rsync/byteorder.h, revision 1.1.1.4

1.1       misho       1: /*
                      2:  * Simple byteorder handling.
                      3:  *
                      4:  * Copyright (C) 1992-1995 Andrew Tridgell
1.1.1.4 ! misho       5:  * Copyright (C) 2007-2020 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: 
                     23: /* We know that the x86 can handle misalignment and has the same
                     24:  * byte order (LSB-first) as the 32-bit numbers we transmit. */
1.1.1.3   misho      25: #if defined __i386__ || defined __i486__ || defined __i586__ || defined __i686__ || __amd64
1.1       misho      26: #define CAREFUL_ALIGNMENT 0
                     27: #endif
                     28: 
                     29: #ifndef CAREFUL_ALIGNMENT
                     30: #define CAREFUL_ALIGNMENT 1
                     31: #endif
                     32: 
                     33: #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
                     34: #define UVAL(buf,pos) ((uint32)CVAL(buf,pos))
                     35: 
                     36: #if CAREFUL_ALIGNMENT
                     37: 
1.1.1.4 ! misho      38: static inline uint32
        !            39: IVALu(const uchar *buf, int pos)
        !            40: {
        !            41:        return UVAL(buf, pos)
        !            42:             | UVAL(buf, pos + 1) << 8
        !            43:             | UVAL(buf, pos + 2) << 16
        !            44:             | UVAL(buf, pos + 3) << 24;
        !            45: }
1.1       misho      46: 
1.1.1.4 ! misho      47: static inline void
        !            48: SIVALu(uchar *buf, int pos, uint32 val)
        !            49: {
        !            50:        CVAL(buf, pos)     = val;
        !            51:        CVAL(buf, pos + 1) = val >> 8;
        !            52:        CVAL(buf, pos + 2) = val >> 16;
        !            53:        CVAL(buf, pos + 3) = val >> 24;
        !            54: }
        !            55: 
        !            56: static inline int64
        !            57: IVAL64(const char *buf, int pos)
        !            58: {
        !            59:        return IVALu((uchar*)buf, pos) | (int64)IVALu((uchar*)buf, pos + 4) << 32;
        !            60: }
        !            61: 
        !            62: static inline void
        !            63: SIVAL64(char *buf, int pos, int64 val)
        !            64: {
        !            65:        SIVALu((uchar*)buf, pos, val);
        !            66:        SIVALu((uchar*)buf, pos + 4, val >> 32);
        !            67: }
1.1       misho      68: 
                     69: #else /* !CAREFUL_ALIGNMENT */
                     70: 
                     71: /* This handles things for architectures like the 386 that can handle alignment errors.
                     72:  * WARNING: This section is dependent on the length of an int32 (and thus a uint32)
                     73:  * being correct (4 bytes)!  Set CAREFUL_ALIGNMENT if it is not. */
                     74: 
                     75: static inline uint32
                     76: IVALu(const uchar *buf, int pos)
                     77: {
                     78:        union {
                     79:                const uchar *b;
                     80:                const uint32 *num;
                     81:        } u;
                     82:        u.b = buf + pos;
                     83:        return *u.num;
                     84: }
                     85: 
                     86: static inline void
                     87: SIVALu(uchar *buf, int pos, uint32 val)
                     88: {
                     89:        union {
                     90:                uchar *b;
                     91:                uint32 *num;
                     92:        } u;
                     93:        u.b = buf + pos;
                     94:        *u.num = val;
                     95: }
                     96: 
1.1.1.3   misho      97: static inline int64
                     98: IVAL64(const char *buf, int pos)
                     99: {
                    100:        union {
                    101:                const char *b;
                    102:                const int64 *num;
                    103:        } u;
                    104:        u.b = buf + pos;
                    105:        return *u.num;
                    106: }
                    107: 
                    108: static inline void
                    109: SIVAL64(char *buf, int pos, int64 val)
                    110: {
                    111:        union {
                    112:                char *b;
                    113:                int64 *num;
                    114:        } u;
                    115:        u.b = buf + pos;
                    116:        *u.num = val;
1.1       misho     117: }
                    118: 
                    119: #endif /* !CAREFUL_ALIGNMENT */
1.1.1.4 ! misho     120: 
        !           121: static inline uint32
        !           122: IVAL(const char *buf, int pos)
        !           123: {
        !           124:        return IVALu((uchar*)buf, pos);
        !           125: }
        !           126: 
        !           127: static inline void
        !           128: SIVAL(char *buf, int pos, uint32 val)
        !           129: {
        !           130:        SIVALu((uchar*)buf, pos, val);
        !           131: }
        !           132: