diff options
Diffstat (limited to 'shared/ossp_uuid/uuid_bm.h')
-rw-r--r-- | shared/ossp_uuid/uuid_bm.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/shared/ossp_uuid/uuid_bm.h b/shared/ossp_uuid/uuid_bm.h new file mode 100644 index 00000000..4cdcec05 --- /dev/null +++ b/shared/ossp_uuid/uuid_bm.h @@ -0,0 +1,80 @@ +/* +** OSSP uuid - Universally Unique Identifier +** Copyright (c) 2004-2008 Ralf S. Engelschall <rse@engelschall.com> +** Copyright (c) 2004-2008 The OSSP Project <http://www.ossp.org/> +** +** This file is part of OSSP uuid, a library for the generation +** of UUIDs which can found at http://www.ossp.org/pkg/lib/uuid/ +** +** Permission to use, copy, modify, and distribute this software for +** any purpose with or without fee is hereby granted, provided that +** the above copyright notice and this permission notice appear in all +** copies. +** +** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED +** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR +** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF +** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT +** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +** SUCH DAMAGE. +** +** uuid_bm.c: bitmask API implementation +*/ + +#ifndef __UUID_BM_H__ +#define __UUID_BM_H__ + +/* + * Bitmask Calculation Macros (up to 32 bit only) + * (Notice: bit positions are counted n...0, i.e. lowest bit is position 0) + */ + +/* generate a bitmask consisting of 1 bits from (and including) + bit position `l' (left) to (and including) bit position `r' */ +#define BM_MASK(l,r) \ + ((((unsigned int)1<<(((l)-(r))+1))-1)<<(r)) + +/* extract a value v from a word w at position `l' to `r' and return value */ +#define BM_GET(w,l,r) \ + (((w)>>(r))&BM_MASK((l)-(r),0)) + +/* insert a value v into a word w at position `l' to `r' and return word */ +#define BM_SET(w,l,r,v) \ + ((w)|(((v)&BM_MASK((l)-(r),0))<<(r))) + +/* generate a single bit `b' (0 or 1) at bit position `n' */ +#define BM_BIT(n,b) \ + ((b)<<(n)) + +/* generate a quad word octet of bits (a half byte, i.e. bit positions 3 to 0) */ +#define BM_QUAD(b3,b2,b1,b0) \ + (BM_BIT(3,(b3))|BM_BIT(2,(b2))|BM_BIT(1,(b1))|BM_BIT(0,(b0))) + +/* generate an octet word of bits (a byte, i.e. bit positions 7 to 0) */ +#define BM_OCTET(b7,b6,b5,b4,b3,b2,b1,b0) \ + ((BM_QUAD(b7,b6,b5,b4)<<4)|BM_QUAD(b3,b2,b1,b0)) + +/* generate the value 2^n */ +#define BM_POW2(n) \ + BM_BIT(n,1) + +/* shift word w k bits to the left or to the right */ +#define BM_SHL(w,k) \ + ((w)<<(k)) +#define BM_SHR(w,k) \ + ((w)>>(k)) + +/* rotate word w (of bits n..0) k bits to the left or to the right */ +#define BM_ROL(w,n,k) \ + ((BM_SHL((w),(k))&BM_MASK(n,0))|BM_SHR(((w)&BM_MASK(n,0)),(n)-(k))) +#define BM_ROR(w,n,k) \ + ((BM_SHR(((w)&BM_MASK(n,0)),(k)))|BM_SHL(((w),(n)-(k))&BM_MASK(n,0))) + +#endif /* __UUID_BM_H__ */ + |