mirror of https://github.com/nealey/irc-bot
156 lines
2.9 KiB
C
156 lines
2.9 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include "cdb.h"
|
|
|
|
/* Some things I use for debugging */
|
|
#ifdef NODUMP
|
|
# define DUMPf(fmt, args...)
|
|
#else
|
|
# define DUMPf(fmt, args...) fprintf(stderr, "%s:%s:%d " fmt "\n", __FILE__, __FUNCTION__, __LINE__, ##args)
|
|
#endif
|
|
#define DUMP() DUMPf("")
|
|
#define DUMP_u(v) DUMPf("%s = %u", #v, v)
|
|
#define DUMP_d(v) DUMPf("%s = %d", #v, v)
|
|
#define DUMP_x(v) DUMPf("%s = 0x%x", #v, v)
|
|
#define DUMP_s(v) DUMPf("%s = %s", #v, v)
|
|
#define DUMP_c(v) DUMPf("%s = %c", #v, v)
|
|
#define DUMP_p(v) DUMPf("%s = %p", #v, v)
|
|
|
|
#ifndef min
|
|
#define min(a,b) ((a)<(b)?(a):(b))
|
|
#endif
|
|
|
|
uint32_t
|
|
hash(char *s, size_t len)
|
|
{
|
|
uint32_t h = 5381;
|
|
size_t i;
|
|
|
|
for (i = 0; i < len; i += 1) {
|
|
h = ((h << 5) + h) ^ s[i];
|
|
}
|
|
return h;
|
|
}
|
|
|
|
int
|
|
usage()
|
|
{
|
|
fprintf(stderr, "Usage: infobot\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint32_t
|
|
read_u32(FILE *f)
|
|
{
|
|
uint8_t d[4];
|
|
|
|
fread(d, 4, 1, f);
|
|
return ((d[0]<< 0) |
|
|
(d[1] << 8) |
|
|
(d[2] << 16) |
|
|
(d[3] << 24));
|
|
}
|
|
|
|
|
|
int
|
|
bufcmp(char *a, size_t alen, char *b, size_t blen)
|
|
{
|
|
if (alen == blen) {
|
|
return memcmp(a, b, blen);
|
|
} else {
|
|
return alen - blen;
|
|
}
|
|
}
|
|
|
|
void
|
|
cdb_init(struct cdb_ctx *ctx, FILE *f)
|
|
{
|
|
ctx->f = f;
|
|
ctx->key = NULL;
|
|
}
|
|
|
|
void
|
|
cdb_find(struct cdb_ctx *ctx, char *key, uint32_t keylen)
|
|
{
|
|
ctx->hash_val = hash(key, keylen);
|
|
|
|
ctx->key = key;
|
|
ctx->keylen = keylen;
|
|
|
|
/* Read pointer */
|
|
fseek(ctx->f, (ctx->hash_val % 256) * 8, SEEK_SET);
|
|
ctx->hash_pos = read_u32(ctx->f);
|
|
ctx->hash_len = read_u32(ctx->f);
|
|
ctx->entry = (ctx->hash_val / 256) % ctx->hash_len;
|
|
}
|
|
|
|
uint32_t
|
|
cdb_next(struct cdb_ctx *ctx, char *buf, uint32_t buflen)
|
|
{
|
|
uint32_t hashval;
|
|
uint32_t entry_pos;
|
|
uint32_t klen;
|
|
uint32_t dlen;
|
|
|
|
for (;;) {
|
|
fseek(ctx->f, ctx->hash_pos + (ctx->entry++ * 8), SEEK_SET);
|
|
hashval = read_u32(ctx->f);
|
|
entry_pos = read_u32(ctx->f);
|
|
if (entry_pos == 0) {
|
|
break;
|
|
}
|
|
if (hashval != ctx->hash_val) {
|
|
continue;
|
|
}
|
|
|
|
fseek(ctx->f, entry_pos, SEEK_SET);
|
|
klen = read_u32(ctx->f);
|
|
dlen = read_u32(ctx->f);
|
|
|
|
if (klen == ctx->keylen) {
|
|
uint32_t i;
|
|
|
|
for (i = 0; i < klen; i += 1) {
|
|
int c = fgetc(ctx->f);
|
|
|
|
if (c != ctx->key[i]) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i < klen) {
|
|
continue;
|
|
}
|
|
|
|
return fread(buf, 1, min(dlen, buflen), ctx->f);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
if (1 == argc) {
|
|
return usage();
|
|
}
|
|
|
|
{
|
|
struct cdb_ctx ctx;
|
|
char buf[8192];
|
|
int32_t r;
|
|
|
|
cdb_init(&ctx, stdin);
|
|
cdb_find(&ctx, argv[1], strlen(argv[1]));
|
|
while ((r = cdb_next(&ctx, buf, sizeof buf))) {
|
|
printf("%.*s\n", r, buf);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|