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.

{
    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);
                }
            }
        }
}

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().

__bt_pgout()

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

Definition at line 129 of file bt_conv.c.

{
    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);
}

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().

__P()

static void mswap __P ( (PAGE *)  )

static

mswap()

static void mswap ( PAGE *  pg )

static

Definition at line 203 of file bt_conv.c.

{
    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);
}

Referenced by __bt_pgin(), and __bt_pgout().