/* 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 "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/txt_db.h>

#undef BUFSIZE
#define BUFSIZE 512

TXT_DB *TXT_DB_read(BIO *in, int num)
{
    TXT_DB *ret = NULL;
    int esc = 0;
    long ln = 0;
    int i, add, n;
    int size = BUFSIZE;
    int offset = 0;
    char *p, *f;
    OPENSSL_STRING *pp;
    BUF_MEM *buf = NULL;

    if ((buf = BUF_MEM_new()) == NULL)
        goto err;
    if (!BUF_MEM_grow(buf, size))
        goto err;

    if ((ret = OPENSSL_malloc(sizeof(*ret))) == NULL)
        goto err;
    ret->num_fields = num;
    ret->index = NULL;
    ret->qual = NULL;
    if ((ret->data = sk_OPENSSL_PSTRING_new_null()) == NULL)
        goto err;
    if ((ret->index = OPENSSL_malloc(sizeof(*ret->index) * num)) == NULL)
        goto err;
    if ((ret->qual = OPENSSL_malloc(sizeof(*(ret->qual)) * 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 = OPENSSL_malloc(add + offset)) == NULL)
                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')) {
            ret->error = DB_ERROR_WRONG_NUM_FIELDS;
            goto err;
        }
        pp[n] = p;
        if (!sk_OPENSSL_PSTRING_push(ret->data, pp))
            goto err;
    }
    BUF_MEM_free(buf);
    return ret;
 err:
    BUF_MEM_free(buf);
    if (ret != NULL) {
        sk_OPENSSL_PSTRING_free(ret->data);
        OPENSSL_free(ret->index);
        OPENSSL_free(ret->qual);
        OPENSSL_free(ret);
    }
    return (NULL);
}

OPENSSL_STRING *TXT_DB_get_by_index(TXT_DB *db, int idx,
                                    OPENSSL_STRING *value)
{
    OPENSSL_STRING *ret;
    LHASH_OF(OPENSSL_STRING) *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 = lh_OPENSSL_STRING_retrieve(lh, value);
    db->error = DB_ERROR_OK;
    return (ret);
}

int TXT_DB_create_index(TXT_DB *db, int field, int (*qual) (OPENSSL_STRING *),
                        LHASH_HASH_FN_TYPE hash, LHASH_COMP_FN_TYPE cmp)
{
    LHASH_OF(OPENSSL_STRING) *idx;
    OPENSSL_STRING *r;
    int i, n;

    if (field >= db->num_fields) {
        db->error = DB_ERROR_INDEX_OUT_OF_RANGE;
        return (0);
    }
    /* FIXME: we lose type checking at this point */
    if ((idx = (LHASH_OF(OPENSSL_STRING) *)lh_new(hash, cmp)) == NULL) {
        db->error = DB_ERROR_MALLOC;
        return (0);
    }
    n = sk_OPENSSL_PSTRING_num(db->data);
    for (i = 0; i < n; i++) {
        r = sk_OPENSSL_PSTRING_value(db->data, i);
        if ((qual != NULL) && (qual(r) == 0))
            continue;
        if ((r = lh_OPENSSL_STRING_insert(idx, r)) != NULL) {
            db->error = DB_ERROR_INDEX_CLASH;
            db->arg1 = sk_OPENSSL_PSTRING_find(db->data, r);
            db->arg2 = i;
            lh_OPENSSL_STRING_free(idx);
            return (0);
        }
    }
    lh_OPENSSL_STRING_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_OPENSSL_PSTRING_num(db->data);
    nn = db->num_fields;
    for (i = 0; i < n; i++) {
        pp = sk_OPENSSL_PSTRING_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:
    BUF_MEM_free(buf);
    return (ret);
}

int TXT_DB_insert(TXT_DB *db, OPENSSL_STRING *row)
{
    int i;
    OPENSSL_STRING *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 = lh_OPENSSL_STRING_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_OPENSSL_PSTRING_push(db->data, 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;
            (void)lh_OPENSSL_STRING_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--)
            lh_OPENSSL_STRING_free(db->index[i]);
        OPENSSL_free(db->index);
    }
    OPENSSL_free(db->qual);
    if (db->data != NULL) {
        for (i = sk_OPENSSL_PSTRING_num(db->data) - 1; i >= 0; i--) {
            /*
             * check if any 'fields' have been allocated from outside of the
             * initial block
             */
            p = sk_OPENSSL_PSTRING_value(db->data, i);
            max = p[db->num_fields]; /* last address */
            if (max == NULL) {  /* new row */
                for (n = 0; n < db->num_fields; n++)
                    OPENSSL_free(p[n]);
            } else {
                for (n = 0; n < db->num_fields; n++) {
                    if (((p[n] < (char *)p) || (p[n] > max)))
                        OPENSSL_free(p[n]);
                }
            }
            OPENSSL_free(sk_OPENSSL_PSTRING_value(db->data, i));
        }
        sk_OPENSSL_PSTRING_free(db->data);
    }
    OPENSSL_free(db);
}