| 1 | /* |
| 2 | * Simple byteorder handling. |
| 3 | * |
| 4 | * Copyright (C) 1992-1995 Andrew Tridgell |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. |
| 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. */ |
| 25 | #ifdef __i386__ |
| 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 | #define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val)) |
| 36 | |
| 37 | /* Our 64-bit numbers are sent in MSB-first order so that we can use |
| 38 | * the highest bits to indicate the number of bytes sent. */ |
| 39 | #define NVAL2(b,m) ((UVAL(b,0)&~(m))<<8|UVAL(b,1)) |
| 40 | #define NVAL3(b,m) (NVAL2(b,m)<<8|UVAL(b,2)) |
| 41 | #define NVAL4(b,m) (NVAL3(b,m)<<8|UVAL(b,3)) |
| 42 | #define NVAL5(b,m) ((int64)NVAL4(b,m)<<8|UVAL(b,4)) |
| 43 | #define NVAL6(b,m) (NVAL5(b,m)<<8|UVAL(b,5)) |
| 44 | #define NVAL7(b,m) (NVAL6(b,m)<<8|UVAL(b,6)) |
| 45 | #define NVAL8(b,m) (NVAL7(b,m)<<8|UVAL(b,7)) |
| 46 | |
| 47 | #if CAREFUL_ALIGNMENT |
| 48 | #define PVAL(buf,pos) (UVAL(buf,pos)|UVAL(buf,(pos)+1)<<8) |
| 49 | #define IVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+2)<<16) |
| 50 | #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8) |
| 51 | #define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16)) |
| 52 | #define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val))) |
| 53 | #else |
| 54 | /* this handles things for architectures like the 386 that can handle |
| 55 | alignment errors */ |
| 56 | /* |
| 57 | WARNING: This section is dependent on the length of int32 |
| 58 | being correct. set CAREFUL_ALIGNMENT if it is not. |
| 59 | */ |
| 60 | #define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos))) |
| 61 | #define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val)) |
| 62 | #endif |