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z_cdbb.c
488 lines (403 loc) · 8.88 KB
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z_cdbb.c
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#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <uint32.h>
#include <time.h>
#include <array.h>
#include <str.h>
#include <open.h>
#include <cdb_make.h>
#include "z_entry.h"
#include "z_blog.h"
#include "z_cdbb.h"
#include "z_features.h"
void init_nentry(struct nentry *n)
{
memset(&n->e, 0, sizeof(array));
memset(&n->k, 0, sizeof(array));
}
struct nentry *new_nentry(void)
{
struct nentry *n;
n = malloc(sizeof(struct nentry));
init_nentry(n);
return n;
}
void reset_nentry(struct nentry *n)
{
array_reset(&n->e);
array_reset(&n->k);
}
void free_nentry(struct nentry *n)
{
reset_nentry(n);
free(n);
}
/* OPERATIONS / FILTER SETUP */
/* LEVEL 0 - FILE */
int cdbb_open_read(struct cdbb *a, const char *f)
{
int fd = open_read(f);
if (fd < 0)
return fd;
a->r = malloc(sizeof(struct cdb));
if (a->r == NULL) {
close(fd);
return -1;
}
/* suppress valgrind warning:
* "Uninitialised value was created by a heap allocation" in cdb_free */
a->r->map = 0;
cdb_init(a->r, fd);
return fd;
}
void cdbb_close_read(struct cdbb *a)
{
if (a->r->fd > 0)
close(a->r->fd);
cdb_free(a->r);
free(a->r);
}
#ifdef ADMIN_MODE
int cdbb_open_write(struct cdbb *a, const char *f)
{
int fp;
unlink(f);
fp = open_write(f);
if (fp < 0)
return -1;
a->w = malloc(sizeof(struct cdb_make));
if (a->w == NULL) {
close(fp);
return -1;
}
cdb_make_start(a->w, fp);
a->fnum = 0;
a->tnum = 0;
return fp;
}
void cdbb_close_write(struct cdbb *a)
{
cdb_make_finish(a->w);
free(a->w);
}
/* LEVLEL COPYING LOGIC */
static int cdbb_check_ops(struct cdbb *a, unsigned char *k,
size_t ks, unsigned char *v, size_t vs)
{
struct op *t;
int i, f;
f = 0;
for (i = 0; i < a->tnum; i++) {
t = &a->ops[i];
if (array_bytes(&t->n) == ks && !memcmp(k, t->n.p, ks) && ks) {
t->kf = 1;
if (t->t != O_ADD)
f = 1;
/* no value trigger */
if ((array_bytes(&t->v) != 0)) {
if (t->t == O_MOD || t->t == O_ADD_MOD)
continue;
/* value trigger */
t->sv = realloc(t->sv, vs);
if (t->sv == NULL)
continue;
memcpy(t->sv, v, vs);
/* values do match */
if (!memcmp(t->v.p, t->sv, vs))
t->vf = 1;
else
f = 0; /* reset found */
}
}
}
return f;
}
/* LEVLEL COPYING LOGIC */
static int cdbb_check_filter(struct cdbb *a, unsigned char *k, size_t ks,
unsigned char *v, size_t vs)
{
int i;
for (i = 0; i < a->fnum; i++) {
if (a->fil[i] (k, ks, v, vs))
return 1;
}
return 0;
}
static int cdbb_handle_ops(struct cdbb *a)
{
int i;
int num;
struct op *t;
num = 0;
for (i = 0; i < a->tnum; i++) {
t = &a->ops[i];
if (t->kf) { /* trigger was fired */
switch (t->t) {
case O_ADD:
case O_ADD_MOD:
/* fall-trought */
case O_MOD:
cdb_make_add(a->w,
(unsigned char *)t->n.p,
array_bytes(&t->n),
(unsigned char *)t->v.p,
array_bytes(&t->v));
num++;
break;
case O_DEL:
/* do nothing, fall-trough */
case O_NONE:
default:
break;
}
} else {
switch (t->t) {
case O_ADD_MOD:
/* key not found so add, fall-trough */
case O_ADD:
cdb_make_add(a->w,
(unsigned char *)t->n.p,
array_bytes(&t->n),
(unsigned char *)t->v.p,
array_bytes(&t->v));
num++;
break;
case O_DEL:
/* key not found error */
break;
case O_MOD:
/* key not found error */
break;
case O_NONE:
/* fall-trought */
default:
break;
}
}
}
return num;
}
static int __cdbb_copy(struct cdbb *a, size_t ks, size_t vs)
{
unsigned char k[ks];
unsigned char v[vs];
uint32 kp, dp;
int found, filter;
found = 0;
kp = cdb_keypos(a->r);
cdb_read(a->r, k, ks, kp);
dp = cdb_datapos(a->r);
/* in some cases we do not need to read e.g. when deleting
* or filtering but for simplicity we just do it anyways */
cdb_read(a->r, v, vs, dp);
found = cdbb_check_ops(a, k, ks, v, vs);
filter = cdbb_check_filter(a, k, ks, v, vs);
/* if an operation applied or a filter, don't copy */
if (!found && !filter && kp) {
cdb_make_add(a->w, k, ks, v, vs);
return 1;
}
return 0;
}
int cdbb_copy(struct cdbb *a)
{
uint32 kfindpos, ks, vs;
int num = 0;
if (!cdb_firstkey(a->r, &kfindpos))
return 0;
do {
ks = cdb_keylen(a->r);
vs = cdb_datalen(a->r);
num += __cdbb_copy(a, ks, vs);
} while (cdb_nextkey(a->r, &kfindpos) == 1);
return num;
}
/* LEVEL 1 - SETUP */
void cdbb_add_filter(struct cdbb *a, filter cb)
{
a->fil[a->fnum++] = cb;
}
void cdbb_add_op(struct cdbb *a, char *n, size_t ns, enum opt t)
{
array *c = &a->ops[a->tnum].n;
memset(&a->ops[a->tnum].v, 0, sizeof(array));
a->ops[a->tnum].svs = 0;
a->ops[a->tnum].sv = NULL;
a->ops[a->tnum].t = t;
memset(c, 0, sizeof(array));
array_catb(c, n, ns);
++(a->tnum);
}
void cdbb_add_vop(struct cdbb *a, char *n,
size_t ns, char *v, size_t vs, enum opt t)
{
cdbb_add_op(a, n, ns, t);
/* write to tnum -1 because add_op already incremented */
array_catb(&a->ops[a->tnum - 1].v, v, vs);
}
void free_ops(struct cdbb *a)
{
int i;
for (i = 0; i < a->tnum; i++) {
if (a->ops[i].sv)
free(a->ops[i].sv);
array_reset(&a->ops[i].n);
array_reset(&a->ops[i].v);
}
}
int cdbb_start_mod(struct cdbb *a, char *f)
{
int err;
a->f = f;
a->t = malloc(strlen(a->f) + 5);
if (a->t == NULL)
return -1;
strcpy(a->t, a->f);
strcat(a->t, ".tmp");
err = cdbb_open_write(a, a->t);
if (err <= 0)
return -1;
err = cdbb_open_read(a, a->f);
return err;
}
int cdbb_apply(struct cdbb *a)
{
int err = 0;
err = cdbb_copy(a);
err += cdbb_handle_ops(a);
rename(a->t, a->f);
if (err == 0)
unlink(a->f);
if (a->t)
free(a->t);
cdbb_close_read(a);
cdbb_close_write(a);
free_ops(a);
return err;
}
/* HIGH LEVEL OPERATIONS, let the compiler do inlining, clang seems to have a bug when
* using explicit inlining*/
void cdbb_add(struct cdbb *a, char *k, size_t ks, char *v, size_t vs)
{
cdbb_add_vop(a, k, ks, v, vs, O_ADD);
}
void cdbb_mod(struct cdbb *a, char *k, size_t ks, char *v, size_t vs)
{
cdbb_add_vop(a, k, ks, v, vs, O_MOD);
}
void cdbb_rep(struct cdbb *a, char *k, size_t ks, char *v, size_t vs)
{
cdbb_add_vop(a, k, ks, v, vs, O_ADD_MOD);
}
void cdbb_del(struct cdbb *a, char *k, size_t ks)
{
cdbb_add_op(a, k, ks, O_DEL);
}
void cdbb_del_val(struct cdbb *a, char *k, size_t ks, char *v, size_t vs)
{
cdbb_add_vop(a, k, ks, v, vs, O_DEL);
}
#endif
int cdbb_readn(struct cdbb *a, char *k, size_t ks, char *v, size_t n)
{
int dlen;
if (cdb_find(a->r, (unsigned char *)k, ks) <= 0)
return -1;
dlen = cdb_datalen(a->r);
if (dlen > n)
return -2;
if (cdb_read(a->r, (unsigned char *)v, dlen, cdb_datapos(a->r)) < 0)
return -3;
return 1;
}
int cdbb_firstkey(struct cdbb *a)
{
if (!cdb_firstkey(a->r, &a->kfindpos))
return -1;
return 1;
}
/* from VLC
* http://goalbit.git.sourceforge.net/git/gitweb.cgi?p=goalbit/goalbit;a=blob_plain;f=compat/strcasestr.c;h=e01e5c39acb9848b1bf86a9565282ece4b61b368;hb=779d38a
* The dietlibc does not have strcasestr or similar. (Or I am too blind to find it).
* This sucks badly. */
static char *strcasestr(const char *psz_big, const char *psz_little)
{
char *p_pos = (char *)psz_big;
if (!*psz_little)
return p_pos;
while (*p_pos) {
if (toupper(*p_pos) == toupper(*psz_little)) {
char *psz_cur1 = p_pos + 1;
char *psz_cur2 = (char *)psz_little + 1;
while (*psz_cur1 && *psz_cur2 &&
toupper(*psz_cur1) == toupper(*psz_cur2)) {
psz_cur1++;
psz_cur2++;
}
if (!*psz_cur2)
return p_pos;
}
p_pos++;
}
return NULL;
}
static int __cdbb_findnext(struct cdbb *a, const char *needle, struct nentry *n,
int ignorecase)
{
uint32 kp, dp, ks, vs;
unsigned char *k, *v;
if (cdb_nextkey(a->r, &a->kfindpos) != 1)
return -1;
kp = cdb_keypos(a->r);
ks = cdb_keylen(a->r);
k = alloca(ks);
cdb_read(a->r, k, ks, kp);
dp = cdb_datapos(a->r);
vs = cdb_datalen(a->r);
/* in some cases we do not need to read e.g. when deleting
* or filtering but for simplicity we just do it anyways */
v = alloca(vs);
cdb_read(a->r, v, vs, dp);
/* search value */
if (ignorecase) {
if (strcasestr((char *)v, needle) == NULL)
return 0;
} else {
if (strstr((char *)v, needle) == NULL)
return 0;
}
array_catb(&n->k, (char *)k, ks);
array_catb(&n->e, (char *)v, vs);
return 1;
}
int cdbb_findnext_ignorecase(struct cdbb *a, const char *needle,
struct nentry *n)
{
return __cdbb_findnext(a, needle, n, 1);
}
int cdbb_findnext(struct cdbb *a, const char *needle, struct nentry *n)
{
return __cdbb_findnext(a, needle, n, 0);
}
int cdbb_read_nentry(struct cdbb *a, char *k, size_t ks, struct nentry *n)
{
int err, dlen;
unsigned char *buf;
array_catb(&n->k, k, ks);
err = cdb_find(a->r, (unsigned char *)k, ks);
if (err <= 0)
return err;
err = 0; /* num */
do {
dlen = cdb_datalen(a->r);
buf = alloca(dlen);
if (cdb_read(a->r, buf, dlen, cdb_datapos(a->r)) < 0)
return -2;
array_catb(&n->e, (char *)buf, dlen);
err++;
} while (cdb_findnext(a->r, (unsigned char *)k, ks) > 0);
return err;
}