1 files changed, 137 insertions, 0 deletions
diff --git a/buckets/apr_buckets_simple.c b/buckets/apr_buckets_simple.c
new file mode 100644
index 0000000..cef748b
--- /dev/null
+++ b/buckets/apr_buckets_simple.c
@@ -0,0 +1,137 @@
+/* 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"
+
+APU_DECLARE_NONSTD(apr_status_t) apr_bucket_simple_copy(apr_bucket *a,
+                                                        apr_bucket **b)
+{
+    *b = apr_bucket_alloc(sizeof(**b), a->list); /* XXX: check for failure? */
+    **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_bucket_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_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_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_bucket_setaside(apr_bucket *b, apr_pool_t *pool)
+{
+    b = apr_bucket_heap_make(b, (char *)b->data + b->start, b->length, NULL);
+    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_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_transient_make(b, buf, length);
+}
+
+const apr_bucket_type_t apr_bucket_type_immortal = {
+    "IMMORTAL", 5, APR_BUCKET_DATA,
+    apr_bucket_destroy_noop,
+    simple_bucket_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_DATA,
+    apr_bucket_destroy_noop, 
+    simple_bucket_read,
+    transient_bucket_setaside,
+    apr_bucket_simple_split,
+    apr_bucket_simple_copy
+};