/*

Copyright (c) 1998-2018 University Corporation for Atmospheric Research/Unidata

See LICENSE.txt for license information.

*/

#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#ifdef HAVE_STDINT_H

#include <stdint.h>

#endif

#include "ncdispatch.h"

#include "nccrc.h"

#include "nchashmap.h"

#include "nc3internal.h"

#undef DEBUG

#undef DEBUGTRACE

#undef ASSERTIONS

/**

@Internal

This hashmap is optimized to use counted strings as its

key value. It is assumed in most cases that a string plus its

length are passed in for doing lookups.

When an entry is added, a copy of the string is kept in the hash table

entry. Since we also keep the hashkey, the probability is high that

we will only do string comparisons when they will match.

*/

#undef SMALLTABLE

#ifdef ASSERTIONS

#define ASSERT(x) assert(x)

#else

#define ASSERT(x)

#endif

#ifdef DEBUGTRACE

#define Trace(x) {fprintf(stderr,"NC_hashmap: %s\n",x); fflush(stderr);}

#else

#define Trace(x)

#endif

#define SEED 37

/* See lookup3.c */

extern nchashkey_t hash_fast(const char*, size_t length);

/* this should be prime */

#ifdef SMALLTABLE

#define MINTABLESIZE 7U

#else

#define MINTABLESIZE 131U

#endif

/* Flags must be powers of 2 */

/* Slot has data */

#define ACTIVE 1

/* Slot had its value deleted */

#define DELETED 2

/* Slot is unused */

#define EMPTY 0

#define MAX(a,b) ((a) > (b) ? (a) : (b))

/* Forward */

static const unsigned int NC_nprimes;

static const unsigned int NC_primes[16386];

static unsigned int findPrimeGreaterThan(size_t val);

extern void printhashmapstats(NC_hashmap* hm);

extern void printhashmap(NC_hashmap* hm);

static int

rehash(NC_hashmap* hm)

{

    size_t alloc = hm->alloc;

#ifdef ASSERTIONS

    size_t active = hm->active;

#endif

    NC_hentry* oldtable = hm->table;

    Trace("rehash");

    hm->alloc = findPrimeGreaterThan(alloc<<1);

    if(hm->alloc == 0) return 0;

    hm->table = (NC_hentry*)calloc(sizeof(NC_hentry), hm->alloc);

    hm->active = 0;

    while(alloc > 0) {

        NC_hentry* h = &oldtable[--alloc];

        if(h->flags == ACTIVE) {

            NC_hashmapadd(hm, h->data, h->key, h->keysize);

      if(h->key) free(h->key);

        }

    }

    free(oldtable);

    ASSERT(active == hm->active);

    return 1;

}

/* Locate where given object is or should be placed in indexp.

   if fail to find spot return 0 else 1.

   If deletok then a deleted slot is ok to return;

   return invariant: return == 0 || *indexp is defined

 */

static int

locate(NC_hashmap* hash, nchashkey_t hashkey, const char* key, size_t keysize, size_t* indexp, int deletedok)

{

    size_t i;

    size_t index;

    size_t step = 1; /* simple linear probe */

    int deletefound = 0;

    size_t deletedindex = 0; /* first deleted entry encountered */

    NC_hentry* entry;

    Trace("locate");

    /* Compute starting point */

    assert(hash->alloc > 0);

    index = (size_t)(hashkey % hash->alloc);

    /* Search table using linear probing */

    for (i = 0; i < hash->alloc; i++) {

      entry = &hash->table[index];

      if(entry->flags & ACTIVE) {

      if(indexp) *indexp = index; /* assume a match */

            if(entry->hashkey == hashkey && entry->keysize == keysize) {

    /* Check content */

    if(memcmp(entry->key,key,keysize)==0)

        return 1;

            }

      /* Keep looking */

  } else if(entry->flags & DELETED) {

      if(!deletefound) {/* save this position */

          deletefound = 1;

    deletedindex = index;

      }

      /* Keep looking */

  } else { /* Empty slot */

      if(indexp) *indexp = index;

      return 1;

  }

        /* linear probe */

  assert(hash->alloc > 0);

  index = (index + step) % hash->alloc;

    }

    if(deletedok && deletefound) {

  if(indexp) *indexp = deletedindex;

  return 1;

    }

    return 0;

}

/* Return the hash key for specified key; takes key+size*/

/* Wrapper for crc64*/

nchashkey_t

NC_hashmapkey(const char* key, size_t size)

{

    return NC_crc64(0,(void*)key,(unsigned int)size);

}

NC_hashmap*

NC_hashmapnew(size_t startsize)

{

    NC_hashmap* hm = NULL;

    Trace("NC_hashmapnew");

    hm = (NC_hashmap*)malloc(sizeof(NC_hashmap));

    if(startsize == 0 || startsize < MINTABLESIZE)

  startsize = MINTABLESIZE;

    else {

  startsize *= 4;

  startsize /= 3;

  startsize = findPrimeGreaterThan(startsize);

  if(startsize == 0) {nullfree(hm); return 0;}

    }

    hm->table = (NC_hentry*)calloc(sizeof(NC_hentry), (size_t)startsize);

    hm->alloc = startsize;

    hm->active = 0;

    return hm;

}

int

NC_hashmapadd(NC_hashmap* hash, uintptr_t data, const char* key, size_t keysize)

{

  NC_hentry* entry;

  nchashkey_t hashkey;

    Trace("NC_hashmapadd");

    if(key == NULL || keysize == 0)

      return 0;

    hashkey = NC_hashmapkey(key,keysize);

    if((hash->alloc*3)/4 <= hash->active)

  {if(!rehash(hash)) return 0;}

    for(;;) {

  size_t index;

  if(!locate(hash,hashkey,key,keysize,&index,1)) {

      if(!rehash(hash)) return 0;

      continue; /* try on larger table */

  }

        entry = &hash->table[index];

  if(entry->flags & ACTIVE) {

      /* key already exists in table => overwrite data */

      entry->data = data;

      return 1;

        } else { /* !ACTIVE || DELETED */

      entry->flags = ACTIVE;

      entry->data = data;

      entry->hashkey = hashkey;

      entry->keysize = keysize;

      entry->key = malloc(keysize+1);

      if(entry->key == NULL)

    return 0;

      memcpy(entry->key,key,keysize);

      entry->key[keysize] = '\0'; /* ensure null terminated */

      ++hash->active;

      return 1;

  }

     }

     return 0;

}

int

NC_hashmapremove(NC_hashmap* hash, const char* key, size_t keysize, uintptr_t* datap)

{

    nchashkey_t hashkey;

    size_t index;

    NC_hentry* h;

    Trace("NC_hashmapremove");

    if(key == NULL || keysize == 0)

  return 0;

    hashkey = NC_hashmapkey(key,keysize);

    if(!locate(hash,hashkey,key,keysize,&index,0))

  return 0; /* not present */

    h = &hash->table[index];

    if(h->flags & ACTIVE) { /* matching entry found */

  h->flags = DELETED; /* also turn off ACTIVE */

  if(h->key) free(h->key);

  h->key = NULL;

  h->keysize = 0;

  --hash->active;

  if(datap) *datap = h->data;

  return 1;

    } else /* !ACTIVE && !DELETED => not in table*/

  return 0;

}

int

NC_hashmapget(NC_hashmap* hash, const char* key, size_t keysize, uintptr_t* datap)

{

    nchashkey_t hashkey;

    Trace("NC_hashmapget");

    if(key == NULL || keysize == 0)

  return 0;

    hashkey = NC_hashmapkey(key,keysize);

    if(hash->active) {

      size_t index;

      NC_hentry* h;

      if(!locate(hash,hashkey,key,keysize,&index,0))

      return 0; /* not present */

      h = &hash->table[index];

  if(h->flags & ACTIVE) {

    if(datap) *datap = h->data;

      return 1;

        } else /* Not found */

      return 0;

    }

    return 0;

}

/** Change the data for the specified key

    Return 1 if found, 0 otherwise

*/

int

NC_hashmapsetdata(NC_hashmap* hash, const char* key, size_t keysize, uintptr_t newdata)

{

    size_t index;

    NC_hentry* h;

    nchashkey_t hashkey;

    Trace("NC_hashmapsetdata");

    if(key == NULL || keysize == 0)

  return 0;

    hashkey = NC_hashmapkey(key,keysize);

    if(hash == NULL || hash->active == 0)

  return 0; /* no such entry */

    if(!locate(hash,hashkey,key,keysize,&index,0))

        return 0; /* not present */

    h = &hash->table[index];

    assert((h->flags & ACTIVE) == ACTIVE);

    h->data = newdata;

    return 1;

}

size_t

NC_hashmapcount(NC_hashmap* hash)

{

    Trace("NC_hashmapcount");

    return hash->active;

}

int

NC_hashmapith(NC_hashmap* map, size_t i, uintptr_t* datap, const char** keyp)

{

    NC_hentry* h = NULL;

    if(map == NULL || i >= map->alloc) return NC_EINVAL;

    h = &map->table[i];

    if(h && (h->flags & ACTIVE)) {

  if(datap) *datap = h->data;

  if(keyp) *((char**)keyp) = h->key;

    } else {

  if(datap) *datap = 0;

  if(keyp) *((char**)keyp) = NULL;

    }    

    return NC_NOERR;

}

int

NC_hashmapfree(NC_hashmap* hash)

{

    Trace("NC_hashmapfree");

    if(hash) {

      int i;

#ifdef DEBUG

      printhashmapstats(hash);

#endif

      for(i=0;i<hash->alloc;i++) {

  NC_hentry* he = &hash->table[i];

  if((he->flags & ACTIVE) && he->key != NULL)

     free(he->key);

      }

      free(hash->table);

      free(hash);

    }

    return 1;

}

/**

Friend: ncindex.c

Only used by ncindex.c.

Allows a hack by ncindex.

*/

int

NC_hashmapdeactivate(NC_hashmap* map, uintptr_t data)

{

    size_t i;

    NC_hentry* h;

    for(h=map->table,i=0;i<map->alloc;i++,h++) {

  if((h->flags & ACTIVE) && h->data == data) {

      h->flags = DELETED;

      if(h->key) free(h->key);

      h->key = NULL;

      h->keysize = 0;

      --map->active;

      return 1;

  }

    }

    return 0;

}

/**************************************************/

/* Prime table */

/* Function that returns true if n is prime else returns false */

/* This will currently fail if `n > 180503 * 180503` */

static int isPrime(size_t n)

{

    size_t i;

    if (n <= 1)  return 0;

    if (n <= 3)  return 1;

    for (i=1; i < NC_nprimes - 1; i++) {

      size_t prime = NC_primes[i];

      if (n % prime == 0) {

  return 0;

      }

      if (prime * prime > n) {

  break;

      }

    }

    return 1;

}

/* Function to return the smallest prime number greater than N */

static int nextPrime(size_t val)

{

    if (val <= 1)

        return 2;

    size_t prime = val;

    if (prime % 2 == 0) { /* Make sure `prime` is odd */

      prime--;

    }

    /* Loop continuously until isPrime returns */

    /* true for a number greater than n */

    for (;;) {

        prime += 2;

        if (isPrime(prime))

    break;

    }

    return prime;

}

/*

Binary search prime table for first prime just greater than or

equal to val

*/

static unsigned int

findPrimeGreaterThan(size_t val)

{

      int n = NC_nprimes;

      int L = 1; /* skip leading flag number */

      int R = (n - 2); /* skip trailing flag */

      unsigned int v = 0;

      int m;

      if(val >= 0xFFFFFFFF)

        return 0; /* Too big */

      v = (unsigned int)val;

      if (v > NC_primes[n - 2]) {

        /*

         If we have a value greater than the largest value in the 

         NC_primes table, then search for a prime instead of just

         doing a simple lookup.

        */

  return nextPrime(val);

      }

      for(;;) {

        if(L >= R) break;

        m = (L + R) / 2;

        /* is this an acceptable prime? */

        if(NC_primes[m-1] < v && NC_primes[m] >= v)

          return NC_primes[m]; /* acceptable*/

        else if(NC_primes[m-1] >= v)

          R = m;

        else if(NC_primes[m] < v)

          L = m;

      }

      return 0;

}

/*

Table of the the first 2^14 primes.

Add leading and trailing values to simplify

search binary algorithm.

*/

static const unsigned int NC_primes[16386] = {

0U,

2U, 3U, 5U, 7U, 11U, 13U, 17U, 19U, 23U, 29U,

31U, 37U, 41U, 43U, 47U, 53U, 59U, 61U, 67U, 71U,

73U, 79U, 83U, 89U, 97U, 101U, 103U, 107U, 109U, 113U,

127U, 131U, 137U, 139U, 149U, 151U, 157U, 163U, 167U, 173U,

179U, 181U, 191U, 193U, 197U, 199U, 211U, 223U, 227U, 229U,

233U, 239U, 241U, 251U, 257U, 263U, 269U, 271U, 277U, 281U,

283U, 293U, 307U, 311U, 313U, 317U, 331U, 337U, 347U, 349U,

353U, 359U, 367U, 373U, 379U, 383U, 389U, 397U, 401U, 409U,

419U, 421U, 431U, 433U, 439U, 443U, 449U, 457U, 461U, 463U,

467U, 479U, 487U, 491U, 499U, 503U, 509U, 521U, 523U, 541U,

547U, 557U, 563U, 569U, 571U, 577U, 587U, 593U, 599U, 601U,

607U, 613U, 617U, 619U, 631U, 641U, 643U, 647U, 653U, 659U,

661U, 673U, 677U, 683U, 691U, 701U, 709U, 719U, 727U, 733U,

739U, 743U, 751U, 757U, 761U, 769U, 773U, 787U, 797U, 809U,

811U, 821U, 823U, 827U, 829U, 839U, 853U, 857U, 859U, 863U,

877U, 881U, 883U, 887U, 907U, 911U, 919U, 929U, 937U, 941U,

947U, 953U, 967U, 971U, 977U, 983U, 991U, 997U, 1009U, 1013U,

1019U, 1021U, 1031U, 1033U, 1039U, 1049U, 1051U, 1061U, 1063U, 1069U,

1087U, 1091U, 1093U, 1097U, 1103U, 1109U, 1117U, 1123U, 1129U, 1151U,

1153U, 1163U, 1171U, 1181U, 1187U, 1193U, 1201U, 1213U, 1217U, 1223U,

1229U, 1231U, 1237U, 1249U, 1259U, 1277U, 1279U, 1283U, 1289U, 1291U,

1297U, 1301U, 1303U, 1307U, 1319U, 1321U, 1327U, 1361U, 1367U, 1373U,

1381U, 1399U, 1409U, 1423U, 1427U, 1429U, 1433U, 1439U, 1447U, 1451U,

1453U, 1459U, 1471U, 1481U, 1483U, 1487U, 1489U, 1493U, 1499U, 1511U,

1523U, 1531U, 1543U, 1549U, 1553U, 1559U, 1567U, 1571U, 1579U, 1583U,

1597U, 1601U, 1607U, 1609U, 1613U, 1619U, 1621U, 1627U, 1637U, 1657U,

1663U, 1667U, 1669U, 1693U, 1697U, 1699U, 1709U, 1721U, 1723U, 1733U,

1741U, 1747U, 1753U, 1759U, 1777U, 1783U, 1787U, 1789U, 1801U, 1811U,

1823U, 1831U, 1847U, 1861U, 1867U, 1871U, 1873U, 1877U, 1879U, 1889U,

1901U, 1907U, 1913U, 1931U, 1933U, 1949U, 1951U, 1973U, 1979U, 1987U,

1993U, 1997U, 1999U, 2003U, 2011U, 2017U, 2027U, 2029U, 2039U, 2053U,

2063U, 2069U, 2081U, 2083U, 2087U, 2089U, 2099U, 2111U, 2113U, 2129U,

2131U, 2137U, 2141U, 2143U, 2153U, 2161U, 2179U, 2203U, 2207U, 2213U,

2221U, 2237U, 2239U, 2243U, 2251U, 2267U, 2269U, 2273U, 2281U, 2287U,

2293U, 2297U, 2309U, 2311U, 2333U, 2339U, 2341U, 2347U, 2351U, 2357U,

2371U, 2377U, 2381U, 2383U, 2389U, 2393U, 2399U, 2411U, 2417U, 2423U,

2437U, 2441U, 2447U, 2459U, 2467U, 2473U, 2477U, 2503U, 2521U, 2531U,

2539U, 2543U, 2549U, 2551U, 2557U, 2579U, 2591U, 2593U, 2609U, 2617U,

2621U, 2633U, 2647U, 2657U, 2659U, 2663U, 2671U, 2677U, 2683U, 2687U,

2689U, 2693U, 2699U, 2707U, 2711U, 2713U, 2719U, 2729U, 2731U, 2741U,

2749U, 2753U, 2767U, 2777U, 2789U, 2791U, 2797U, 2801U, 2803U, 2819U,

2833U, 2837U, 2843U, 2851U, 2857U, 2861U, 2879U, 2887U, 2897U, 2903U,

2909U, 2917U, 2927U, 2939U, 2953U, 2957U, 2963U, 2969U, 2971U, 2999U,

3001U, 3011U, 3019U, 3023U, 3037U, 3041U, 3049U, 3061U, 3067U, 3079U,

3083U, 3089U, 3109U, 3119U, 3121U, 3137U, 3163U, 3167U, 3169U, 3181U,

3187U, 3191U, 3203U, 3209U, 3217U, 3221U, 3229U, 3251U, 3253U, 3257U,

3259U, 3271U, 3299U, 3301U, 3307U, 3313U, 3319U, 3323U, 3329U, 3331U,

3343U, 3347U, 3359U, 3361U, 3371U, 3373U, 3389U, 3391U, 3407U, 3413U,

3433U, 3449U, 3457U, 3461U, 3463U, 3467U, 3469U, 3491U, 3499U, 3511U,

3517U, 3527U, 3529U, 3533U, 3539U, 3541U, 3547U, 3557U, 3559U, 3571U,

3581U, 3583U, 3593U, 3607U, 3613U, 3617U, 3623U, 3631U, 3637U, 3643U,

3659U, 3671U, 3673U, 3677U, 3691U, 3697U, 3701U, 3709U, 3719U, 3727U,

3733U, 3739U, 3761U, 3767U, 3769U, 3779U, 3793U, 3797U, 3803U, 3821U,

3823U, 3833U, 3847U, 3851U, 3853U, 3863U, 3877U, 3881U, 3889U, 3907U,

3911U, 3917U, 3919U, 3923U, 3929U, 3931U, 3943U, 3947U, 3967U, 3989U,

4001U, 4003U, 4007U, 4013U, 4019U, 4021U, 4027U, 4049U, 4051U, 4057U,

4073U, 4079U, 4091U, 4093U, 4099U, 4111U, 4127U, 4129U, 4133U, 4139U,

4153U, 4157U, 4159U, 4177U, 4201U, 4211U, 4217U, 4219U, 4229U, 4231U,

4241U, 4243U, 4253U, 4259U, 4261U, 4271U, 4273U, 4283U, 4289U, 4297U,

4327U, 4337U, 4339U, 4349U, 4357U, 4363U, 4373U, 4391U, 4397U, 4409U,

4421U, 4423U, 4441U, 4447U, 4451U, 4457U, 4463U, 4481U, 4483U, 4493U,

4507U, 4513U, 4517U, 4519U, 4523U, 4547U, 4549U, 4561U, 4567U, 4583U,

4591U, 4597U, 4603U, 4621U, 4637U, 4639U, 4643U, 4649U, 4651U, 4657U,

4663U, 4673U, 4679U, 4691U, 4703U, 4721U, 4723U, 4729U, 4733U, 4751U,

4759U, 4783U, 4787U, 4789U, 4793U, 4799U, 4801U, 4813U, 4817U, 4831U,

4861U, 4871U, 4877U, 4889U, 4903U, 4909U, 4919U, 4931U, 4933U, 4937U,

4943U, 4951U, 4957U, 4967U, 4969U, 4973U, 4987U, 4993U, 4999U, 5003U,

5009U, 5011U, 5021U, 5023U, 5039U, 5051U, 5059U, 5077U, 5081U, 5087U,

5099U, 5101U, 5107U, 5113U, 5119U, 5147U, 5153U, 5167U, 5171U, 5179U,

5189U, 5197U, 5209U, 5227U, 5231U, 5233U, 5237U, 5261U, 5273U, 5279U,

5281U, 5297U, 5303U, 5309U, 5323U, 5333U, 5347U, 5351U, 5381U, 5387U,

5393U, 5399U, 5407U, 5413U, 5417U, 5419U, 5431U, 5437U, 5441U, 5443U,

5449U, 5471U, 5477U, 5479U, 5483U, 5501U, 5503U, 5507U, 5519U, 5521U,

5527U, 5531U, 5557U, 5563U, 5569U, 5573U, 5581U, 5591U, 5623U, 5639U,

5641U, 5647U, 5651U, 5653U, 5657U, 5659U, 5669U, 5683U, 5689U, 5693U,

5701U, 5711U, 5717U, 5737U, 5741U, 5743U, 5749U, 5779U, 5783U, 5791U,

5801U, 5807U, 5813U, 5821U, 5827U, 5839U, 5843U, 5849U, 5851U, 5857U,

5861U, 5867U, 5869U, 5879U, 5881U, 5897U, 5903U, 5923U, 5927U, 5939U,

5953U, 5981U, 5987U, 6007U, 6011U, 6029U, 6037U, 6043U, 6047U, 6053U,

6067U, 6073U, 6079U, 6089U, 6091U, 6101U, 6113U, 6121U, 6131U, 6133U,

6143U, 6151U, 6163U, 6173U, 6197U, 6199U, 6203U, 6211U, 6217U, 6221U,

6229U, 6247U, 6257U, 6263U, 6269U, 6271U, 6277U, 6287U, 6299U, 6301U,

6311U, 6317U, 6323U, 6329U, 6337U, 6343U, 6353U, 6359U, 6361U, 6367U,

6373U, 6379U, 6389U, 6397U, 6421U, 6427U, 6449U, 6451U, 6469U, 6473U,

6481U, 6491U, 6521U, 6529U, 6547U, 6551U, 6553U, 6563U, 6569U, 6571U,

6577U, 6581U, 6599U, 6607U, 6619U, 6637U, 6653U, 6659U, 6661U, 6673U,

6679U, 6689U, 6691U, 6701U, 6703U, 6709U, 6719U, 6733U, 6737U, 6761U,

6763U, 6779U, 6781U, 6791U, 6793U, 6803U, 6823U, 6827U, 6829U, 6833U,

6841U, 6857U, 6863U, 6869U, 6871U, 6883U, 6899U, 6907U, 6911U, 6917U,

6947U, 6949U, 6959U, 6961U, 6967U, 6971U, 6977U, 6983U, 6991U, 6997U,

7001U, 7013U, 7019U, 7027U, 7039U, 7043U, 7057U, 7069U, 7079U, 7103U,

7109U, 7121U, 7127U, 7129U, 7151U, 7159U, 7177U, 7187U, 7193U, 7207U,

7211U, 7213U, 7219U, 7229U, 7237U, 7243U, 7247U, 7253U, 7283U, 7297U,

7307U, 7309U, 7321U, 7331U, 7333U, 7349U, 7351U, 7369U, 7393U, 7411U,

7417U, 7433U, 7451U, 7457U, 7459U, 7477U, 7481U, 7487U, 7489U, 7499U,

7507U, 7517U, 7523U, 7529U, 7537U, 7541U, 7547U, 7549U, 7559U, 7561U,

7573U, 7577U, 7583U, 7589U, 7591U, 7603U, 7607U, 7621U, 7639U, 7643U,

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