text: /* crypto/txt_db/txt_db.c */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include "cryptlib.h"
  #include <openssl/buffer.h>
  #include <openssl/txt_db.h>
  
  #undef BUFSIZE
  #define BUFSIZE 512
  
  const char TXT_DB_version[] = "TXT_DB" OPENSSL_VERSION_PTEXT;
  
  TXT_DB *TXT_DB_read(BIO *in, int num)
  {
      TXT_DB *ret = NULL;
      int er = 1;
      int esc = 0;
      long ln = 0;
      int i, add, n;
      int size = BUFSIZE;
      int offset = 0;
      char *p, **pp, *f;
      BUF_MEM *buf = NULL;
  
      if ((buf = BUF_MEM_new()) == NULL)
          goto err;
      if (!BUF_MEM_grow(buf, size))
          goto err;
  
      if ((ret = (TXT_DB *)OPENSSL_malloc(sizeof(TXT_DB))) == NULL)
          goto err;
      ret->num_fields = num;
      ret->index = NULL;
      ret->qual = NULL;
      if ((ret->data = sk_new_null()) == NULL)
          goto err;
      if ((ret->index =
           (LHASH **)OPENSSL_malloc(sizeof(LHASH *) * num)) == NULL)
          goto err;
      if ((ret->qual =
           (int (**)(char **))OPENSSL_malloc(sizeof(int (**)(char **)) *
                                             num)) == NULL)
          goto err;
      for (i = 0; i < num; i++) {
          ret->index[i] = NULL;
          ret->qual[i] = NULL;
      }
  
      add = (num + 1) * sizeof(char *);
      buf->data[size - 1] = '\0';
      offset = 0;
      for (;;) {
          if (offset != 0) {
              size += BUFSIZE;
              if (!BUF_MEM_grow_clean(buf, size))
                  goto err;
          }
          buf->data[offset] = '\0';
          BIO_gets(in, &(buf->data[offset]), size - offset);
          ln++;
          if (buf->data[offset] == '\0')
              break;
          if ((offset == 0) && (buf->data[0] == '#'))
              continue;
          i = strlen(&(buf->data[offset]));
          offset += i;
          if (buf->data[offset - 1] != '\n')
              continue;
          else {
              buf->data[offset - 1] = '\0'; /* blat the '\n' */
              if (!(p = (char *)OPENSSL_malloc(add + offset)))
                  goto err;
              offset = 0;
          }
          pp = (char **)p;
          p += add;
          n = 0;
          pp[n++] = p;
          i = 0;
          f = buf->data;
  
          esc = 0;
          for (;;) {
              if (*f == '\0')
                  break;
              if (*f == '\t') {
                  if (esc)
                      p--;
                  else {
                      *(p++) = '\0';
                      f++;
                      if (n >= num)
                          break;
                      pp[n++] = p;
                      continue;
                  }
              }
              esc = (*f == '\\');
              *(p++) = *(f++);
          }
          *(p++) = '\0';
          if ((n != num) || (*f != '\0')) {
  #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) /* temporaty
                                                                 * fix :-( */
              fprintf(stderr,
                      "wrong number of fields on line %ld (looking for field %d, got %d, '%s' left)\n",
                      ln, num, n, f);
  #endif
              er = 2;
              goto err;
          }
          pp[n] = p;
          if (!sk_push(ret->data, (char *)pp)) {
  #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) /* temporaty
                                                                 * fix :-( */
              fprintf(stderr, "failure in sk_push\n");
  #endif
              er = 2;
              goto err;
          }
      }
      er = 0;
   err:
      BUF_MEM_free(buf);
      if (er) {
  #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
          if (er == 1)
              fprintf(stderr, "OPENSSL_malloc failure\n");
  #endif
          if (ret != NULL) {
              if (ret->data != NULL)
                  sk_free(ret->data);
              if (ret->index != NULL)
                  OPENSSL_free(ret->index);
              if (ret->qual != NULL)
                  OPENSSL_free(ret->qual);
              if (ret != NULL)
                  OPENSSL_free(ret);
          }
          return (NULL);
      } else
          return (ret);
  }
  
  char **TXT_DB_get_by_index(TXT_DB *db, int idx, char **value)
  {
      char **ret;
      LHASH *lh;
  
      if (idx >= db->num_fields) {
          db->error = DB_ERROR_INDEX_OUT_OF_RANGE;
          return (NULL);
      }
      lh = db->index[idx];
      if (lh == NULL) {
          db->error = DB_ERROR_NO_INDEX;
          return (NULL);
      }
      ret = (char **)lh_retrieve(lh, value);
      db->error = DB_ERROR_OK;
      return (ret);
  }
  
  int TXT_DB_create_index(TXT_DB *db, int field, int (*qual) (char **),
                          LHASH_HASH_FN_TYPE hash, LHASH_COMP_FN_TYPE cmp)
  {
      LHASH *idx;
      char **r;
      int i, n;
  
      if (field >= db->num_fields) {
          db->error = DB_ERROR_INDEX_OUT_OF_RANGE;
          return (0);
      }
      if ((idx = lh_new(hash, cmp)) == NULL) {
          db->error = DB_ERROR_MALLOC;
          return (0);
      }
      n = sk_num(db->data);
      for (i = 0; i < n; i++) {
          r = (char **)sk_value(db->data, i);
          if ((qual != NULL) && (qual(r) == 0))
              continue;
          if ((r = lh_insert(idx, r)) != NULL) {
              db->error = DB_ERROR_INDEX_CLASH;
              db->arg1 = sk_find(db->data, (char *)r);
              db->arg2 = i;
              lh_free(idx);
              return (0);
          }
      }
      if (db->index[field] != NULL)
          lh_free(db->index[field]);
      db->index[field] = idx;
      db->qual[field] = qual;
      return (1);
  }
  
  long TXT_DB_write(BIO *out, TXT_DB *db)
  {
      long i, j, n, nn, l, tot = 0;
      char *p, **pp, *f;
      BUF_MEM *buf = NULL;
      long ret = -1;
  
      if ((buf = BUF_MEM_new()) == NULL)
          goto err;
      n = sk_num(db->data);
      nn = db->num_fields;
      for (i = 0; i < n; i++) {
          pp = (char **)sk_value(db->data, i);
  
          l = 0;
          for (j = 0; j < nn; j++) {
              if (pp[j] != NULL)
                  l += strlen(pp[j]);
          }
          if (!BUF_MEM_grow_clean(buf, (int)(l * 2 + nn)))
              goto err;
  
          p = buf->data;
          for (j = 0; j < nn; j++) {
              f = pp[j];
              if (f != NULL)
                  for (;;) {
                      if (*f == '\0')
                          break;
                      if (*f == '\t')
                          *(p++) = '\\';
                      *(p++) = *(f++);
                  }
              *(p++) = '\t';
          }
          p[-1] = '\n';
          j = p - buf->data;
          if (BIO_write(out, buf->data, (int)j) != j)
              goto err;
          tot += j;
      }
      ret = tot;
   err:
      if (buf != NULL)
          BUF_MEM_free(buf);
      return (ret);
  }
  
  int TXT_DB_insert(TXT_DB *db, char **row)
  {
      int i;
      char **r;
  
      for (i = 0; i < db->num_fields; i++) {
          if (db->index[i] != NULL) {
              if ((db->qual[i] != NULL) && (db->qual[i] (row) == 0))
                  continue;
              r = (char **)lh_retrieve(db->index[i], row);
              if (r != NULL) {
                  db->error = DB_ERROR_INDEX_CLASH;
                  db->arg1 = i;
                  db->arg_row = r;
                  goto err;
              }
          }
      }
      /* We have passed the index checks, now just append and insert */
      if (!sk_push(db->data, (char *)row)) {
          db->error = DB_ERROR_MALLOC;
          goto err;
      }
  
      for (i = 0; i < db->num_fields; i++) {
          if (db->index[i] != NULL) {
              if ((db->qual[i] != NULL) && (db->qual[i] (row) == 0))
                  continue;
              lh_insert(db->index[i], row);
          }
      }
      return (1);
   err:
      return (0);
  }
  
  void TXT_DB_free(TXT_DB *db)
  {
      int i, n;
      char **p, *max;
  
      if (db == NULL)
          return;
  
      if (db->index != NULL) {
          for (i = db->num_fields - 1; i >= 0; i--)
              if (db->index[i] != NULL)
                  lh_free(db->index[i]);
          OPENSSL_free(db->index);
      }
      if (db->qual != NULL)
          OPENSSL_free(db->qual);
      if (db->data != NULL) {
          for (i = sk_num(db->data) - 1; i >= 0; i--) {
              /*
               * check if any 'fields' have been allocated from outside of the
               * initial block
               */
              p = (char **)sk_value(db->data, i);
              max = p[db->num_fields]; /* last address */
              if (max == NULL) {  /* new row */
                  for (n = 0; n < db->num_fields; n++)
                      if (p[n] != NULL)
                          OPENSSL_free(p[n]);
              } else {
                  for (n = 0; n < db->num_fields; n++) {
                      if (((p[n] < (char *)p) || (p[n] > max))
                          && (p[n] != NULL))
                          OPENSSL_free(p[n]);
                  }
              }
              OPENSSL_free(sk_value(db->data, i));
          }
          sk_free(db->data);
      }
      OPENSSL_free(db);
  }
  