/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *       "This product includes software developed by the
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 *    if and wherever such third-party acknowledgments normally appear.
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#include "apr_buckets.h"
#include <stdlib.h>

APU_DECLARE_NONSTD(apr_status_t) apr_bucket_simple_copy(apr_bucket *a,
                                                        apr_bucket **b)
{
    if ((*b = malloc(sizeof(**b))) == NULL) {
	return APR_ENOMEM;
    }
    **b = *a;

    return APR_SUCCESS;
}

APU_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_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;
}

APU_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;
}

APU_DECLARE(apr_bucket *) apr_bucket_immortal_create(
		const char *buf, apr_size_t length)
{
    apr_bucket *b = (apr_bucket *)malloc(sizeof(*b));

    APR_BUCKET_INIT(b);
    b->free = free;
    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_setaside(apr_bucket *b, apr_pool_t *pool)
{
    b = apr_bucket_heap_make(b, (char *)b->data + b->start, b->length, 1);
    if (b == NULL) {
        return APR_ENOMEM;
    }
    return APR_SUCCESS;
}

APU_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;
}

APU_DECLARE(apr_bucket *) apr_bucket_transient_create(
		const char *buf, apr_size_t length)
{
    apr_bucket *b = (apr_bucket *)malloc(sizeof(*b));

    APR_BUCKET_INIT(b);
    b->free = free;
    return apr_bucket_transient_make(b, buf, length);
}

const apr_bucket_type_t apr_bucket_type_immortal = {
    "IMMORTAL", 5,
    apr_bucket_destroy_noop,
    simple_read,
    apr_bucket_setaside_noop,
    apr_bucket_simple_split,
    apr_bucket_simple_copy
};

APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_transient = {
    "TRANSIENT", 5,
    apr_bucket_destroy_noop, 
    simple_read,
    transient_setaside,
    apr_bucket_simple_split,
    apr_bucket_simple_copy
};