/*
 * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
 * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <pj/string.h>

PJ_IDEF(pj_size_t) pj_pool_get_capacity(pj_pool_t *pool)
{
    return pool->capacity;
}

PJ_IDEF(pj_size_t) pj_pool_get_used_size(pj_pool_t *pool)
{
    pj_pool_block *b = pool->block_list.next;
    pj_size_t used_size = sizeof(pj_pool_t);
    while (b != &pool->block_list) {
        used_size += (b->cur - b->buf) + sizeof(pj_pool_block);
        b = b->next;
    }
    return used_size;
}

PJ_IDEF(void *) pj_pool_alloc_from_block(pj_pool_block *block, pj_size_t size)
{
    /* The operation below is valid for size==0.
     * When size==0, the function will return the pointer to the pool
     * memory address, but no memory will be allocated.
     */
    if (size & (PJ_POOL_ALIGNMENT - 1)) {
        size = (size + PJ_POOL_ALIGNMENT) & ~(PJ_POOL_ALIGNMENT - 1);
    }
    if ((pj_size_t)(block->end - block->cur) >= size) {
        void *ptr = block->cur;
        block->cur += size;
        return ptr;
    }
    return NULL;
}

PJ_IDEF(void *) pj_pool_alloc(pj_pool_t *pool, pj_size_t size)
{
    void *ptr = pj_pool_alloc_from_block(pool->block_list.next, size);
    if (!ptr)
        ptr = pj_pool_allocate_find(pool, size);
    return ptr;
}

PJ_IDEF(void *) pj_pool_calloc(pj_pool_t *pool, pj_size_t count, pj_size_t size)
{
    void *buf = pj_pool_alloc(pool, size * count);
    if (buf)
        pj_bzero(buf, size * count);
    return buf;
}

PJ_IDEF(const char *) pj_pool_getobjname(const pj_pool_t *pool)
{
    return pool->obj_name;
}

PJ_IDEF(pj_pool_t *)
pj_pool_create(pj_pool_factory *f, const char *name, pj_size_t initial_size, pj_size_t increment_size,
               pj_pool_callback *callback)
{
    return (*f->create_pool)(f, name, initial_size, increment_size, callback);
}

PJ_IDEF(void) pj_pool_release(pj_pool_t *pool)
{
#if PJ_POOL_RELEASE_WIPE_DATA
    pj_pool_block *b;

    b = pool->block_list.next;
    while (b != &pool->block_list) {
        volatile unsigned char *p = b->buf;
        while (p < b->end)
            *p++ = 0;
        b = b->next;
    }
#endif

    if (pool->factory->release_pool)
        (*pool->factory->release_pool)(pool->factory, pool);
}

PJ_IDEF(void) pj_pool_safe_release(pj_pool_t **ppool)
{
    pj_pool_t *pool = *ppool;
    *ppool = NULL;
    if (pool)
        pj_pool_release(pool);
}

PJ_IDEF(void) pj_pool_secure_release(pj_pool_t **ppool)
{
    pj_pool_block *b;
    pj_pool_t *pool = *ppool;
    *ppool = NULL;

    if (!pool)
        return;

    b = pool->block_list.next;
    while (b != &pool->block_list) {
        volatile unsigned char *p = b->buf;
        while (p < b->end)
            *p++ = 0;
        b = b->next;
    }

    pj_pool_release(pool);
}