/* Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include "apr_buckets.h"

APR_DECLARE_NONSTD(apr_status_t) apr_bucket_simple_copy(apr_bucket *a,

                                                        apr_bucket **b)

{

    *b = apr_bucket_alloc(sizeof(**b), a->list); /* XXX: check for failure? */

    **b = *a;

    return APR_SUCCESS;

}

APR_DECLARE_NONSTD(apr_status_t) apr_bucket_simple_split(apr_bucket *a,

                                                         apr_size_t point)

{

    apr_bucket *b;

    if (point > a->length) {

        return APR_EINVAL;

    }

    apr_bucket_simple_copy(a, &b);

    a->length  = point;

    b->length -= point;

    b->start  += point;

    APR_BUCKET_INSERT_AFTER(a, b);

    return APR_SUCCESS;

}

static apr_status_t simple_bucket_read(apr_bucket *b, const char **str,

                                       apr_size_t *len, apr_read_type_e block)

{

    *str = (char *)b->data + b->start;

    *len = b->length;

    return APR_SUCCESS;

}

APR_DECLARE(apr_bucket *) apr_bucket_immortal_make(apr_bucket *b,

                                                   const char *buf,

                                                   apr_size_t length)

{

    b->data   = (char *)buf;

    b->length = length;

    b->start  = 0;

    b->type   = &apr_bucket_type_immortal;

    return b;

}

APR_DECLARE(apr_bucket *) apr_bucket_immortal_create(const char *buf,

                                                     apr_size_t length,

                                                     apr_bucket_alloc_t *list)

{

    apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);

    APR_BUCKET_INIT(b);

    b->free = apr_bucket_free;

    b->list = list;

    return apr_bucket_immortal_make(b, buf, length);

}

/*

 * XXX: This function could do with some tweaking to reduce memory

 * usage in various cases, e.g. share buffers in the heap between all

 * the buckets that are set aside, or even spool set-aside data to

 * disk if it gets too voluminous (but if it does then that's probably

 * a bug elsewhere). There should probably be a apr_brigade_setaside()

 * function that co-ordinates the action of all the bucket setaside

 * functions to improve memory efficiency.

 */

static apr_status_t transient_bucket_setaside(apr_bucket *b, apr_pool_t *pool)

{

    b = apr_bucket_heap_make(b, (char *)b->data + b->start, b->length, NULL);

    if (b == NULL) {

        return APR_ENOMEM;

    }

    return APR_SUCCESS;

}

APR_DECLARE(apr_bucket *) apr_bucket_transient_make(apr_bucket *b,

                                                    const char *buf,

                                                    apr_size_t length)

{

    b->data   = (char *)buf;

    b->length = length;

    b->start  = 0;

    b->type   = &apr_bucket_type_transient;

    return b;

}

APR_DECLARE(apr_bucket *) apr_bucket_transient_create(const char *buf,

                                                      apr_size_t length,

                                                      apr_bucket_alloc_t *list)

{

    apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);

    APR_BUCKET_INIT(b);

    b->free = apr_bucket_free;

    b->list = list;

    return apr_bucket_transient_make(b, buf, length);

}

const apr_bucket_type_t apr_bucket_type_immortal = {

    "IMMORTAL", 5, APR_BUCKET_DATA,

    apr_bucket_destroy_noop,

    simple_bucket_read,

    apr_bucket_setaside_noop,

    apr_bucket_simple_split,

    apr_bucket_simple_copy

};

APR_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_transient = {

    "TRANSIENT", 5, APR_BUCKET_DATA,

    apr_bucket_destroy_noop,

    simple_bucket_read,

    transient_bucket_setaside,

    apr_bucket_simple_split,

    apr_bucket_simple_copy

};