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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "engine.h"
static const uint32_t ND_MARK = 0xffffffff;
static const uint32_t V_MARK = 0xfeffffff;
static const char *HEAD = "XDBF";
static int check(char **known, int len, char *str);
static void freeknown(char ***known, int len);
static long getsz(FILE *fp);
static int checkmark(char *buf, int pos);
static char *readidx(char *buf, int *i, char ***known, int *len, int *pos);
tablist_t *readdb(char *filename) {
FILE *fp;
int len = 2;
tablist_t *list = calloc(len, sizeof(tablist_t));
list[0].len = len;
if (filename == NULL || (fp = fopen(filename, "rb")) == NULL)
return list;
long sz = getsz(fp);
char *buf = calloc(sz, sizeof(char));
fread(buf, sizeof(char), sz, fp);
fclose(fp);
if (strncmp(buf, HEAD, 4)) {
free(buf);
free(list);
return NULL;
}
int tlen, vlen, t = 0, v = 0, l = -1;
char **ktags = calloc((tlen = 2), sizeof(char *));
char **kvalues = calloc((vlen = 2), sizeof(char *));
char *key, *value;
for (int i = 4; i < sz; ++i) {
if (checkmark(buf, i) == 2) {
i += 4;
value = readidx(buf, &i, &kvalues, &vlen, &v);
char *pair = calloc(strlen(key) + strlen(value) + 2, sizeof(char));
sprintf(pair, "%s:%s", key, value);
setkeys(&list, l, &pair, 1);
free(pair);
key = value = NULL;
} else {
key = readidx(buf, &i, &ktags, &tlen, &t);
if (!strcmp(key, "document"))
++l;
}
}
freeknown(&ktags, t);
freeknown(&kvalues, v);
free(buf);
return list;
}
static char *readidx(char *buf, int *i, char ***known, int *len, int *pos) {
char *r = NULL;
if (checkmark(buf, *i) == 1) {
if (*len >= *pos) {
*len *= 2;
*known = realloc(*known, *len * sizeof(char *));
}
*i += 4;
int nlen;
memcpy(&nlen, buf + *i, sizeof(int));
*i += sizeof(int);
(*known)[*pos] = calloc(nlen + 1, sizeof(char));
strncpy((*known)[(*pos)++], buf + *i, nlen);
r = (*known)[(*pos) - 1];
*i += nlen - 1;
} else {
int idx;
memcpy(&idx, buf + *i, sizeof(int));
*i += sizeof(int) - 1;
if (idx > *pos)
return NULL;
r = (*known)[idx];
}
return r;
}
static int checkmark(char *buf, int pos) {
if (!memcmp(buf + pos, &ND_MARK, sizeof(uint32_t)))
return 1;
else if (!memcmp(buf + pos, &V_MARK, sizeof(uint32_t)))
return 2;
return 0;
}
static long getsz(FILE *fp) {
fseek(fp, 0, SEEK_END);
long sz = ftell(fp);
fseek(fp, 0, SEEK_SET);
return sz;
}
static void newtag(char *tag, FILE *fp);
static void writeidx(char ***known, int *len, int *pos, char *str, FILE *fp);
void writedb(char *filename, tablist_t *list) {
FILE *fp = fopen(filename, "wb");
if (fp == NULL)
return;
fwrite(HEAD, sizeof(char), 4, fp);
int tlen, vlen, t = 0, v = 0;
char **ktags = calloc((tlen = 2), sizeof(char *));
writeidx(&ktags, &tlen, &t, "documents", fp);
writeidx(&ktags, &tlen, &t, "document", fp);
char buf[64];
char **kvalues = calloc((vlen = 2), sizeof(char *));
tablist_t *indexes = getkeys(list, -1, NULL, 0);
for (int i = 0; i < indexes[0].len; ++i) {
if (i > 0)
writeidx(&ktags, &tlen, &t, "document", fp);
for (int j = 0; indexes[i].tab[j].flag; ++j) {
writeidx(&ktags, &tlen, &t, indexes[i].tab[j].key, fp);
fwrite(&V_MARK, sizeof(uint32_t), 1, fp);
switch (indexes[i].tab[j].flag) {
case 1:
snprintf(buf, 64, "%g", indexes[i].tab[j].value.num);
writeidx(&kvalues, &vlen, &v, buf, fp);
break;
case 2:
writeidx(&kvalues, &vlen, &v,
indexes[i].tab[j].value.boolean ? "true" : "false",
fp);
break;
case 3:
writeidx(&kvalues, &vlen, &v, indexes[i].tab[j].value.str, fp);
break;
}
}
}
freeknown(&ktags, t);
freeknown(&kvalues, v);
free(indexes);
fclose(fp);
}
static void newtag(char *tag, FILE *fp) {
int len = strlen(tag);
fwrite(&ND_MARK, sizeof(uint32_t), 1, fp);
fwrite(&len, sizeof(int), 1, fp);
fwrite(tag, sizeof(char), len, fp);
}
static void writeidx(char ***known, int *len, int *pos, char *str, FILE *fp) {
int n;
if ((n = check(*known, *pos, str)) >= 0)
fwrite(&n, sizeof(int), 1, fp);
else {
if (*pos >= *len) {
*len *= 2;
*known = realloc(*known, *len * sizeof(char *));
}
(*known)[*pos] = calloc(strlen(str) + 1, sizeof(char));
strcpy((*known)[*pos], str);
newtag((*known)[(*pos)++], fp);
}
}
static void freeknown(char ***known, int pos) {
for (int i = 0; i < pos; ++i)
free((*known)[i]);
free(*known);
}
static int check(char **known, int len, char *str) {
for (int i = 0; i < len; ++i) {
if (!strcmp(str, known[i]))
return i;
}
return -1;
}
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