/* 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;

 EXPORT_C 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);

 	}

 EXPORT_C 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);

 	}

 EXPORT_C 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);

 	}

 EXPORT_C 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);

 	}

 EXPORT_C 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);

 	}

 EXPORT_C 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);

 	}