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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed 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.h"
#include "apr_general.h"
#include "apr_file_io.h"
#include "apr_buckets.h"
#if APR_HAS_MMAP
#include "apr_mmap.h"
/* mmap support for static files based on ideas from John Heidemann's
* patch against 1.0.5. See
* <http://www.isi.edu/~johnh/SOFTWARE/APACHE/index.html>.
*/
#endif /* APR_HAS_MMAP */
static void file_bucket_destroy(void *data)
{
apr_bucket_file *f = data;
if (apr_bucket_shared_destroy(f)) {
/* no need to close the file here; it will get
* done automatically when the pool gets cleaned up */
apr_bucket_free(f);
}
}
#if APR_HAS_MMAP
static int file_make_mmap(apr_bucket *e, apr_size_t filelength,
apr_off_t fileoffset, apr_pool_t *p)
{
apr_bucket_file *a = e->data;
apr_mmap_t *mm;
if (!a->can_mmap) {
return 0;
}
if (filelength > APR_MMAP_LIMIT) {
if (apr_mmap_create(&mm, a->fd, fileoffset, APR_MMAP_LIMIT,
APR_MMAP_READ, p) != APR_SUCCESS)
{
return 0;
}
apr_bucket_split(e, APR_MMAP_LIMIT);
filelength = APR_MMAP_LIMIT;
}
else if ((filelength < APR_MMAP_THRESHOLD) ||
(apr_mmap_create(&mm, a->fd, fileoffset, filelength,
APR_MMAP_READ, p) != APR_SUCCESS))
{
return 0;
}
apr_bucket_mmap_make(e, mm, 0, filelength);
file_bucket_destroy(a);
return 1;
}
#endif
static apr_status_t file_bucket_read(apr_bucket *e, const char **str,
apr_size_t *len, apr_read_type_e block)
{
apr_bucket_file *a = e->data;
apr_file_t *f = a->fd;
apr_bucket *b = NULL;
char *buf;
apr_status_t rv;
apr_size_t filelength = e->length; /* bytes remaining in file past offset */
apr_off_t fileoffset = e->start;
#if APR_HAS_THREADS && !APR_HAS_XTHREAD_FILES
apr_int32_t flags;
#endif
#if APR_HAS_MMAP
if (file_make_mmap(e, filelength, fileoffset, a->readpool)) {
return apr_bucket_read(e, str, len, block);
}
#endif
#if APR_HAS_THREADS && !APR_HAS_XTHREAD_FILES
if ((flags = apr_file_flags_get(f)) & APR_XTHREAD) {
/* this file descriptor is shared across multiple threads and
* this OS doesn't support that natively, so as a workaround
* we must reopen the file into a->readpool */
const char *fname;
apr_file_name_get(&fname, f);
rv = apr_file_open(&f, fname, (flags & ~APR_XTHREAD), 0, a->readpool);
if (rv != APR_SUCCESS)
return rv;
a->fd = f;
}
#endif
*len = (filelength > APR_BUCKET_BUFF_SIZE)
? APR_BUCKET_BUFF_SIZE
: filelength;
*str = NULL; /* in case we die prematurely */
buf = apr_bucket_alloc(*len, e->list);
/* Handle offset ... */
rv = apr_file_seek(f, APR_SET, &fileoffset);
if (rv != APR_SUCCESS) {
apr_bucket_free(buf);
return rv;
}
rv = apr_file_read(f, buf, len);
if (rv != APR_SUCCESS && rv != APR_EOF) {
apr_bucket_free(buf);
return rv;
}
filelength -= *len;
/*
* Change the current bucket to refer to what we read,
* even if we read nothing because we hit EOF.
*/
apr_bucket_heap_make(e, buf, *len, apr_bucket_free);
/* If we have more to read from the file, then create another bucket */
if (filelength > 0 && rv != APR_EOF) {
/* for efficiency, we can just build a new apr_bucket struct
* to wrap around the existing file bucket */
b = apr_bucket_alloc(sizeof(*b), e->list);
b->start = fileoffset + (*len);
b->length = filelength;
b->data = a;
b->type = &apr_bucket_type_file;
b->free = apr_bucket_free;
b->list = e->list;
APR_BUCKET_INSERT_AFTER(e, b);
}
else {
file_bucket_destroy(a);
}
*str = buf;
return rv;
}
APU_DECLARE(apr_bucket *) apr_bucket_file_make(apr_bucket *b, apr_file_t *fd,
apr_off_t offset,
apr_size_t len, apr_pool_t *p)
{
apr_bucket_file *f;
f = apr_bucket_alloc(sizeof(*f), b->list);
f->fd = fd;
f->readpool = p;
#if APR_HAS_MMAP
f->can_mmap = 1;
#endif
b = apr_bucket_shared_make(b, f, offset, len);
b->type = &apr_bucket_type_file;
return b;
}
APU_DECLARE(apr_bucket *) apr_bucket_file_create(apr_file_t *fd,
apr_off_t offset,
apr_size_t len, apr_pool_t *p,
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_file_make(b, fd, offset, len, p);
}
APU_DECLARE(apr_status_t) apr_bucket_file_enable_mmap(apr_bucket *e,
int enabled)
{
#if APR_HAS_MMAP
apr_bucket_file *a = e->data;
a->can_mmap = enabled;
return APR_SUCCESS;
#else
return APR_ENOTIMPL;
#endif /* APR_HAS_MMAP */
}
static apr_status_t file_bucket_setaside(apr_bucket *data, apr_pool_t *reqpool)
{
apr_bucket_file *a = data->data;
apr_file_t *fd = NULL;
apr_file_t *f = a->fd;
apr_pool_t *curpool = apr_file_pool_get(f);
if (apr_pool_is_ancestor(curpool, reqpool)) {
return APR_SUCCESS;
}
if (!apr_pool_is_ancestor(a->readpool, reqpool)) {
a->readpool = reqpool;
}
apr_file_setaside(&fd, f, reqpool);
a->fd = fd;
return APR_SUCCESS;
}
APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_file = {
"FILE", 5, APR_BUCKET_DATA,
file_bucket_destroy,
file_bucket_read,
file_bucket_setaside,
apr_bucket_shared_split,
apr_bucket_shared_copy
};
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