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/* ====================================================================
* Copyright (c) 1996-1999 The Apache Group. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED 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 APACHE GROUP OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
#include "apr_private.h"
#include "apr_buf.h"
#include <stdlib.h>
#ifndef DEFAULT_RWBUF_SIZE
#define DEFAULT_RWBUF_SIZE (4096)
#endif
static const char * rwmem_get_str(ap_bucket *e)
{
ap_bucket_rwmem *b = (ap_bucket_rwmem *)e->data;
return b->start;
}
static int rwmem_get_len(ap_bucket *e)
{
ap_bucket_rwmem *b = (ap_bucket_rwmem *)e->data;
return (char *)b->end - (char *)b->start;
}
static void rwmem_destroy(void *e)
{
ap_bucket_rwmem *d = (ap_bucket_rwmem *)e;
free(d->alloc_addr);
}
static ap_status_t rwmem_split(ap_bucket *e, ap_size_t nbyte)
{
ap_bucket *newbuck;
ap_bucket_rwmem *a = (ap_bucket_rwmem *)e;
ap_bucket_rwmem *b;
ap_ssize_t dump;
newbuck = ap_bucket_rwmem_create(a->alloc_addr, a->alloc_len, &dump);
b = (ap_bucket_rwmem *)newbuck->data;
b->alloc_addr = a->alloc_addr;
b->alloc_len = a->alloc_len;
b->end = a->end;
a->end = a->start + nbyte;
b->start = a->end + 1;
newbuck->prev = e;
newbuck->next = e->next;
e->next = newbuck;
return APR_SUCCESS;
}
/*
* save nbyte bytes to the bucket.
* Only returns fewer than nbyte if an error occurred.
* Returns -1 if no bytes were written before the error occurred.
* It is worth noting that if an error occurs, the buffer is in an unknown
* state.
*/
static ap_status_t rwmem_insert(ap_bucket *e, const void *buf,
ap_size_t nbyte, ap_ssize_t *w)
{
int amt;
int total;
ap_bucket_rwmem *b = (ap_bucket_rwmem *)e->data;
if (nbyte == 0) {
*w = 0;
return APR_SUCCESS;
}
/*
* At this point, we need to make sure we aren't trying to write too much
* data to the bucket. We will need to write to the dist here, but I am
* leaving that for a later pass. The basics are presented below, but this
* is horribly broken.
*/
amt = b->alloc_len - ((char *)b->end - (char *)b->start);
total = 0;
if (nbyte > amt) {
/* loop through and write to the disk */
/* Replace the rwmem buckets with file buckets */
}
/* now we know that nbyte < b->alloc_len */
memcpy(b->end, buf, nbyte);
b->end = (char *)b->end + nbyte;
*w = total + nbyte;
return APR_SUCCESS;
}
APR_EXPORT(ap_bucket *) ap_bucket_rwmem_create(const void *buf,
ap_size_t nbyte, ap_ssize_t *w)
{
ap_bucket *newbuf;
ap_bucket_rwmem *b;
newbuf = calloc(1, sizeof(*newbuf));
b = malloc(sizeof(*b));
b->alloc_addr = calloc(DEFAULT_RWBUF_SIZE, 1);
b->alloc_len = DEFAULT_RWBUF_SIZE;
b->start = b->alloc_addr;
b->end = b->alloc_addr;
newbuf->data = b;
rwmem_insert(newbuf, buf, nbyte, w);
newbuf->color = AP_BUCKET_rwmem;
newbuf->read = rwmem_get_str;
newbuf->getlen = rwmem_get_len;
newbuf->write = rwmem_insert;
newbuf->split = rwmem_split;
newbuf->free = rwmem_destroy;
return newbuf;
}
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