bt_conv.c File Reference

#include <sys/param.h>
#include <stdio.h>
#include "../include/db.h"
#include "btree.h"

Include dependency graph for bt_conv.c:

Go to the source code of this file.

Functions
void	__bt_pgin (void *t, pgno_t pg, void *pp)
void	__bt_pgout (void *t, pgno_t pg, void *pp)
static void mswap	__P ((PAGE *))
static void	mswap (PAGE *pg)

Function Documentation

__bt_pgin()

void __bt_pgin	(	void *	t,
		pgno_t	pg,
		void *	pp
	)

Definition at line 61 of file bt_conv.c.

References B_NEEDSWAP, F_ISSET, _page::flags, GETBINTERNAL, GETBLEAF, _page::linp, _page::lower, mswap(), NEXTINDEX, _page::nextpg, P_BIGDATA, P_BIGKEY, P_BINTERNAL, P_BLEAF, P_META, P_TYPE, _page::pgno, _page::prevpg, and _page::upper.

Referenced by __bt_open().

{
   PAGE *h;
   indx_t i, top;
   u_char flags;
   char *p;

   if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
      return;
   if (pg == P_META) {
      mswap(pp);
      return;
   }

   h = pp;
   M_32_SWAP(h->pgno);
   M_32_SWAP(h->prevpg);
   M_32_SWAP(h->nextpg);
   M_32_SWAP(h->flags);
   M_16_SWAP(h->lower);
   M_16_SWAP(h->upper);

   top = NEXTINDEX(h);
   if ((h->flags & P_TYPE) == P_BINTERNAL)
      for (i = 0; i < top; i++) {
         M_16_SWAP(h->linp[i]);
         p = (char *)GETBINTERNAL(h, i);
         P_32_SWAP(p);
         p += sizeof(u_int32_t);
         P_32_SWAP(p);
         p += sizeof(pgno_t);
         if (*(u_char *)p & P_BIGKEY) {
            p += sizeof(u_char);
            P_32_SWAP(p);
            p += sizeof(pgno_t);
            P_32_SWAP(p);
         }
      }
   else if ((h->flags & P_TYPE) == P_BLEAF)
      for (i = 0; i < top; i++) {
         M_16_SWAP(h->linp[i]);
         p = (char *)GETBLEAF(h, i);
         P_32_SWAP(p);
         p += sizeof(u_int32_t);
         P_32_SWAP(p);
         p += sizeof(u_int32_t);
         flags = *(u_char *)p;
         if (flags & (P_BIGKEY | P_BIGDATA)) {
            p += sizeof(u_char);
            if (flags & P_BIGKEY) {
               P_32_SWAP(p);
               p += sizeof(pgno_t);
               P_32_SWAP(p);
            }
            if (flags & P_BIGDATA) {
               p += sizeof(u_int32_t);
               P_32_SWAP(p);
               p += sizeof(pgno_t);
               P_32_SWAP(p);
            }
         }
      }
}

__bt_pgout()

void __bt_pgout	(	void *	t,
		pgno_t	pg,
		void *	pp
	)

Definition at line 129 of file bt_conv.c.

References B_NEEDSWAP, F_ISSET, _page::flags, GETBINTERNAL, GETBLEAF, _page::linp, _page::lower, mswap(), NEXTINDEX, _page::nextpg, P_BIGDATA, P_BIGKEY, P_BINTERNAL, P_BLEAF, P_META, P_TYPE, _page::pgno, _page::prevpg, and _page::upper.

Referenced by __bt_open().

{
   PAGE *h;
   indx_t i, top;
   u_char flags;
   char *p;

   if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
      return;
   if (pg == P_META) {
      mswap(pp);
      return;
   }

   h = pp;
   top = NEXTINDEX(h);
   if ((h->flags & P_TYPE) == P_BINTERNAL)
      for (i = 0; i < top; i++) {
         p = (char *)GETBINTERNAL(h, i);
         P_32_SWAP(p);
         p += sizeof(u_int32_t);
         P_32_SWAP(p);
         p += sizeof(pgno_t);
         if (*(u_char *)p & P_BIGKEY) {
            p += sizeof(u_char);
            P_32_SWAP(p);
            p += sizeof(pgno_t);
            P_32_SWAP(p);
         }
         M_16_SWAP(h->linp[i]);
      }
   else if ((h->flags & P_TYPE) == P_BLEAF)
      for (i = 0; i < top; i++) {
         p = (char *)GETBLEAF(h, i);
         P_32_SWAP(p);
         p += sizeof(u_int32_t);
         P_32_SWAP(p);
         p += sizeof(u_int32_t);
         flags = *(u_char *)p;
         if (flags & (P_BIGKEY | P_BIGDATA)) {
            p += sizeof(u_char);
            if (flags & P_BIGKEY) {
               P_32_SWAP(p);
               p += sizeof(pgno_t);
               P_32_SWAP(p);
            }
            if (flags & P_BIGDATA) {
               p += sizeof(u_int32_t);
               P_32_SWAP(p);
               p += sizeof(pgno_t);
               P_32_SWAP(p);
            }
         }
         M_16_SWAP(h->linp[i]);
      }

   M_32_SWAP(h->pgno);
   M_32_SWAP(h->prevpg);
   M_32_SWAP(h->nextpg);
   M_32_SWAP(h->flags);
   M_16_SWAP(h->lower);
   M_16_SWAP(h->upper);
}

__P()

static void mswap __P ( (PAGE *)  )

static

mswap()

static void mswap ( PAGE *  pg )

static

Definition at line 203 of file bt_conv.c.

Referenced by __bt_pgin(), and __bt_pgout().

{
   char *p;

   p = (char *)pg;
   P_32_SWAP(p);     /* magic */
   p += sizeof(u_int32_t);
   P_32_SWAP(p);     /* version */
   p += sizeof(u_int32_t);
   P_32_SWAP(p);     /* psize */
   p += sizeof(u_int32_t);
   P_32_SWAP(p);     /* free */
   p += sizeof(u_int32_t);
   P_32_SWAP(p);     /* nrecs */
   p += sizeof(u_int32_t);
   P_32_SWAP(p);     /* flags */
   p += sizeof(u_int32_t);
}