1 files changed, 144 insertions, 0 deletions
diff --git a/buckets/apr_buckets_mmap.c b/buckets/apr_buckets_mmap.c
new file mode 100644
index 0000000..19de291
--- /dev/null
+++ b/buckets/apr_buckets_mmap.c
@@ -0,0 +1,144 @@
+/* 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"
+
+#if APR_HAS_MMAP
+
+static apr_status_t mmap_bucket_read(apr_bucket *b, const char **str, 
+                                     apr_size_t *length, apr_read_type_e block)
+{
+    apr_bucket_mmap *m = b->data;
+    apr_status_t ok;
+    void *addr;
+   
+    if (!m->mmap) {
+        /* the apr_mmap_t was already cleaned up out from under us */
+        return APR_EINVAL;
+    }
+
+    ok = apr_mmap_offset(&addr, m->mmap, b->start);
+    if (ok != APR_SUCCESS) {
+        return ok;
+    }
+    *str = addr;
+    *length = b->length;
+    return APR_SUCCESS;
+}
+
+static apr_status_t mmap_bucket_cleanup(void *data)
+{
+    /* the apr_mmap_t is about to disappear out from under us, so we
+     * have no choice but to pretend it doesn't exist anymore.  the
+     * refcount is now useless because there's nothing to refer to
+     * anymore.  so the only valid action on any remaining referrer
+     * is to delete it.  no more reads, no more anything. */
+    apr_bucket_mmap *m = data;
+
+    m->mmap = NULL;
+    return APR_SUCCESS;
+}
+
+static void mmap_bucket_destroy(void *data)
+{
+    apr_bucket_mmap *m = data;
+
+    if (apr_bucket_shared_destroy(m)) {
+        if (m->mmap) {
+            apr_pool_cleanup_kill(m->mmap->cntxt, m, mmap_bucket_cleanup);
+            apr_mmap_delete(m->mmap);
+        }
+        apr_bucket_free(m);
+    }
+}
+
+/*
+ * XXX: are the start and length arguments useful?
+ */
+APU_DECLARE(apr_bucket *) apr_bucket_mmap_make(apr_bucket *b, apr_mmap_t *mm, 
+                                               apr_off_t start, 
+                                               apr_size_t length)
+{
+    apr_bucket_mmap *m;
+
+    m = apr_bucket_alloc(sizeof(*m), b->list);
+    m->mmap = mm;
+
+    apr_pool_cleanup_register(mm->cntxt, m, mmap_bucket_cleanup,
+                              apr_pool_cleanup_null);
+
+    b = apr_bucket_shared_make(b, m, start, length);
+    b->type = &apr_bucket_type_mmap;
+
+    return b;
+}
+
+
+APU_DECLARE(apr_bucket *) apr_bucket_mmap_create(apr_mmap_t *mm, 
+                                                 apr_off_t start, 
+                                                 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_mmap_make(b, mm, start, length);
+}
+
+static apr_status_t mmap_bucket_setaside(apr_bucket *b, apr_pool_t *p)
+{
+    apr_bucket_mmap *m = b->data;
+    apr_mmap_t *mm = m->mmap;
+    apr_mmap_t *new_mm;
+    apr_status_t ok;
+
+    if (!mm) {
+        /* the apr_mmap_t was already cleaned up out from under us */
+        return APR_EINVAL;
+    }
+
+    /* shortcut if possible */
+    if (apr_pool_is_ancestor(mm->cntxt, p)) {
+        return APR_SUCCESS;
+    }
+
+    /* duplicate apr_mmap_t into new pool */
+    ok = apr_mmap_dup(&new_mm, mm, p);
+    if (ok != APR_SUCCESS) {
+        return ok;
+    }
+
+    /* decrement refcount on old apr_bucket_mmap */
+    mmap_bucket_destroy(m);
+
+    /* create new apr_bucket_mmap pointing to new apr_mmap_t */
+    apr_bucket_mmap_make(b, new_mm, b->start, b->length);
+
+    return APR_SUCCESS;
+}
+
+APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_mmap = {
+    "MMAP", 5, APR_BUCKET_DATA,
+    mmap_bucket_destroy,
+    mmap_bucket_read,
+    mmap_bucket_setaside,
+    apr_bucket_shared_split,
+    apr_bucket_shared_copy
+};
+
+#endif