FreeBSD/Linux Kernel Cross Reference
sys/sys/mchain.h

     /*
      * Copyright (c) 2000, 2001 Boris Popov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *    This product includes software developed by Boris Popov.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS 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 AUTHOR OR 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.
     *
     * $FreeBSD: releng/5.0/sys/sys/mchain.h 106667 2002-11-08 21:26:32Z jhb $
     */
    #ifndef _SYS_MCHAIN_H_
    #define _SYS_MCHAIN_H_
    
    #include <machine/endian.h>
    
    #ifdef _KERNEL
    
    /*
     * XXX: remove these defines and change the function calls in the code. Use
     * it unconditionally if (when) the extended byte order functions become
     * available in user space.
     */
    #define htoles(x)       htole16((x))
    #define letohs(x)       le16toh((x))
    #define htolel(x)       htole32((x))
    #define letohl(x)       le32toh((x))
    #define htoleq(x)       htole64((int64_t)(x))
    #define letohq(x)       le64toh((int64_t)(x))
    
    #define htobes(x)       htobe16((x))
    #define betohs(x)       be16toh((x))
    #define htobel(x)       htobe32((x))
    #define betohl(x)       be32toh((x))
    #define htobeq(x)       htobe64((int64_t)(x))
    #define betohq(x)       be64toh((int64_t)(x))
    
    #else
    /*
     * This macros probably belongs to the endian.h
     */
    #if (BYTE_ORDER == LITTLE_ENDIAN)
    
    #define htoles(x)       ((u_int16_t)(x))
    #define letohs(x)       ((u_int16_t)(x))
    #define htolel(x)       ((u_int32_t)(x))
    #define letohl(x)       ((u_int32_t)(x))
    #define htoleq(x)       ((int64_t)(x))
    #define letohq(x)       ((int64_t)(x))
    
    #define htobes(x)       (__htons(x))
    #define betohs(x)       (__ntohs(x))
    #define htobel(x)       (__htonl(x))
    #define betohl(x)       (__ntohl(x))
    
    static __inline int64_t
    htobeq(int64_t x)
    {
            return (int64_t)__htonl((u_int32_t)(x >> 32)) |
                (int64_t)__htonl((u_int32_t)(x & 0xffffffff)) << 32;
    }
    
    static __inline int64_t
    betohq(int64_t x)
    {
            return (int64_t)__ntohl((u_int32_t)(x >> 32)) |
                (int64_t)__ntohl((u_int32_t)(x & 0xffffffff)) << 32;
    }
    
    #else   /* (BYTE_ORDER == LITTLE_ENDIAN) */
    
    #error "Macros for Big-Endians are incomplete"
    
    /*
    #define htoles(x)       ((u_int16_t)(x))
    #define letohs(x)       ((u_int16_t)(x))
    #define htolel(x)       ((u_int32_t)(x))
   #define letohl(x)       ((u_int32_t)(x))
   */
   #endif  /* (BYTE_ORDER == LITTLE_ENDIAN) */
   #endif  /* _KERNEL */
   
   
   #ifdef _KERNEL
   
   /*
    * Type of copy for mb_{put|get}_mem()
    */
   #define MB_MSYSTEM      0               /* use bcopy() */
   #define MB_MUSER        1               /* use copyin()/copyout() */
   #define MB_MINLINE      2               /* use an inline copy loop */
   #define MB_MZERO        3               /* bzero(), mb_put_mem only */
   #define MB_MCUSTOM      4               /* use an user defined function */
   
   struct mbuf;
   struct mbchain;
   
   typedef int mb_copy_t(struct mbchain *mbp, c_caddr_t src, caddr_t dst, size_t len);
   
   struct mbchain {
           struct mbuf *   mb_top;         /* head of mbufs chain */
           struct mbuf *   mb_cur;         /* current mbuf */
           int             mb_mleft;       /* free space in the current mbuf */
           int             mb_count;       /* total number of bytes */
           mb_copy_t *     mb_copy;        /* user defined copy function */
           void *          mb_udata;       /* user data */
   };
   
   struct mdchain {
           struct mbuf *   md_top;         /* head of mbufs chain */
           struct mbuf *   md_cur;         /* current mbuf */
           u_char *        md_pos;         /* offset in the current mbuf */
   };
   
   int  mb_init(struct mbchain *mbp);
   void mb_initm(struct mbchain *mbp, struct mbuf *m);
   void mb_done(struct mbchain *mbp);
   struct mbuf *mb_detach(struct mbchain *mbp);
   int  mb_fixhdr(struct mbchain *mbp);
   caddr_t mb_reserve(struct mbchain *mbp, int size);
   
   int  mb_put_uint8(struct mbchain *mbp, u_int8_t x);
   int  mb_put_uint16be(struct mbchain *mbp, u_int16_t x);
   int  mb_put_uint16le(struct mbchain *mbp, u_int16_t x);
   int  mb_put_uint32be(struct mbchain *mbp, u_int32_t x);
   int  mb_put_uint32le(struct mbchain *mbp, u_int32_t x);
   int  mb_put_int64be(struct mbchain *mbp, int64_t x);
   int  mb_put_int64le(struct mbchain *mbp, int64_t x);
   int  mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type);
   int  mb_put_mbuf(struct mbchain *mbp, struct mbuf *m);
   int  mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size);
   
   int  md_init(struct mdchain *mdp);
   void md_initm(struct mdchain *mbp, struct mbuf *m);
   void md_done(struct mdchain *mdp);
   void md_append_record(struct mdchain *mdp, struct mbuf *top);
   int  md_next_record(struct mdchain *mdp);
   int  md_get_uint8(struct mdchain *mdp, u_int8_t *x);
   int  md_get_uint16(struct mdchain *mdp, u_int16_t *x);
   int  md_get_uint16le(struct mdchain *mdp, u_int16_t *x);
   int  md_get_uint16be(struct mdchain *mdp, u_int16_t *x);
   int  md_get_uint32(struct mdchain *mdp, u_int32_t *x);
   int  md_get_uint32be(struct mdchain *mdp, u_int32_t *x);
   int  md_get_uint32le(struct mdchain *mdp, u_int32_t *x);
   int  md_get_int64(struct mdchain *mdp, int64_t *x);
   int  md_get_int64be(struct mdchain *mdp, int64_t *x);
   int  md_get_int64le(struct mdchain *mdp, int64_t *x);
   int  md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type);
   int  md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **m);
   int  md_get_uio(struct mdchain *mdp, struct uio *uiop, int size);
   
   #endif  /* ifdef _KERNEL */
   
   #endif  /* !_SYS_MCHAIN_H_ */

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