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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "engine.h"
static int check(char **known, int len, char *str);
static long getsz(FILE *fp);
static char *makepair(char *key, char *value);
// TODO: reimplement this to read file in FI (Fast Infoset) format
// TODO: make this smaller
tablist_t *readdb(char *filename)
{
FILE *fp;
int llen = 2, tlen = 2;
char **ktags = calloc(tlen, sizeof(char *));
tablist_t *list = calloc(llen, sizeof(tablist_t));
list[0].len = llen;
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);
char *v, *k;
for (int i = 0, j = 0, id = 0; i < sz; ++i) {
if (buf[i] == '\n')
continue;
if (j >= tlen)
ktags = realloc(ktags, ++tlen * sizeof(char *));
if (buf[i] == '<' || buf[i] == ':') {
if (buf[i] == '<') {
int t;
for (t = i + 1; buf[t] != '>'; ++t) ;
ktags[j] = calloc(t - i, sizeof(char));
strncpy(ktags[j++], buf + i + 1, t - i - 1);
k = ktags[j - 1];
i += t - i;
} else {
int t;
for (t = i + 1; buf[t] != '\n'; ++t) ;
v = calloc(t - i, sizeof(char));
strncpy(v, buf + i + 1, t - i - 1);
i += t - i;
char *pair = makepair(k, v);
setkeys(&list, id, &pair, 1);
free(pair);
free(v);
}
} else {
int idx = 0;
memcpy(&idx, buf + i, sizeof(int));
i += sizeof(int) - 1;
if (idx == 1)
id++;
k = ktags[idx];
}
}
for (int i = 0; i < tlen - 1; ++i)
free(ktags[i]);
free(ktags);
free(buf);
fclose(fp);
return list;
}
// TODO: Make this write to a file in the FI (Fast Infoset) format
// TODO: Make this smaller
void writedb(char *filename, tablist_t *list)
{
FILE *fp = fopen(filename, "wb");
if (fp == NULL)
return;
int len = 2;
char **ktags = calloc(len, sizeof(char *));
fprintf(fp, "<documents>\n");
fprintf(fp, "<document>\n");
ktags[0] = "documents";
ktags[1] = "document";
tablist_t *indexes = getkeys(list, -1, NULL, 0);
for (int i = 0, j = 2; i < indexes[0].len; ++i) {
int n = 1;
if (i > 0)
fwrite(&n, sizeof(int), 1, fp);
for (int k = 0; indexes[i].tab[k].flag; ++k) {
if ((n = check(ktags, len, indexes[i].tab[k].key)) >= 0)
fwrite(&n, sizeof(int), 1, fp);
else {
fprintf(fp, "<%s>", indexes[i].tab[k].key);
if (j >= len)
ktags = realloc(ktags, ++len * sizeof(char *));
ktags[j] = calloc(strlen(indexes[i].tab[k].key) + 1, sizeof(char));
strcpy(ktags[j++], indexes[i].tab[k].key);
}
switch (indexes[i].tab[k].flag) {
case 1:
fprintf(fp, ":%g\n", indexes[i].tab[k].value.num);
break;
case 2:
fprintf(fp, ":%s\n", indexes[i].tab[k].value.boolean ? "true" : "false");
break;
case 3:
fprintf(fp, ":%s\n", indexes[i].tab[k].value.str);
break;
}
}
}
for (int i = 2; i < len; ++i)
free(ktags[i]);
free(ktags);
free(indexes);
fclose(fp);
}
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;
}
static long getsz(FILE *fp)
{
fseek(fp, 0, SEEK_END);
long sz = ftell(fp);
fseek(fp, 0, SEEK_SET);
return sz;
}
static char *makepair(char *key, char *value)
{
char *pair = calloc(strlen(key) + strlen(value) + 2, sizeof(char));
sprintf(pair, "%s:%s", key, value);
return pair;
}
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