1 files changed, 119 insertions, 0 deletions
diff --git a/buckets/apr_buckets_pipe.c b/buckets/apr_buckets_pipe.c
new file mode 100644
index 000000000..46b469705
--- /dev/null
+++ b/buckets/apr_buckets_pipe.c
@@ -0,0 +1,119 @@
+/* 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"
+
+static apr_status_t pipe_bucket_read(apr_bucket *a, const char **str,
+                                     apr_size_t *len, apr_read_type_e block)
+{
+    apr_file_t *p = a->data;
+    char *buf;
+    apr_status_t rv;
+    apr_interval_time_t timeout;
+
+    if (block == APR_NONBLOCK_READ) {
+        apr_file_pipe_timeout_get(p, &timeout);
+        apr_file_pipe_timeout_set(p, 0);
+    }
+
+    *str = NULL;
+    *len = APR_BUCKET_BUFF_SIZE;
+    buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */
+
+    rv = apr_file_read(p, buf, len);
+
+    if (block == APR_NONBLOCK_READ) {
+        apr_file_pipe_timeout_set(p, timeout);
+    }
+
+    if (rv != APR_SUCCESS && rv != APR_EOF) {
+        apr_bucket_free(buf);
+        return rv;
+    }
+    /*
+     * If there's more to read we have to keep the rest of the pipe
+     * for later.  Otherwise, we'll close the pipe.
+     * XXX: Note that more complicated bucket types that 
+     * refer to data not in memory and must therefore have a read()
+     * function similar to this one should be wary of copying this
+     * code because if they have a destroy function they probably
+     * want to migrate the bucket's subordinate structure from the
+     * old bucket to a raw new one and adjust it as appropriate,
+     * rather than destroying the old one and creating a completely
+     * new bucket.
+     */
+    if (*len > 0) {
+        apr_bucket_heap *h;
+        /* Change the current bucket to refer to what we read */
+        a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free);
+        h = a->data;
+        h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
+        *str = buf;
+        APR_BUCKET_INSERT_AFTER(a, apr_bucket_pipe_create(p, a->list));
+    }
+    else {
+        apr_bucket_free(buf);
+        a = apr_bucket_immortal_make(a, "", 0);
+        *str = a->data;
+        if (rv == APR_EOF) {
+            apr_file_close(p);
+        }
+    }
+    return APR_SUCCESS;
+}
+
+APU_DECLARE(apr_bucket *) apr_bucket_pipe_make(apr_bucket *b, apr_file_t *p)
+{
+    /*
+     * A pipe is closed when the end is reached in pipe_bucket_read().  If
+     * the pipe isn't read to the end (e.g., error path), the pipe will be
+     * closed when its pool goes away.
+     *
+     * Note that typically the pipe is allocated from the request pool
+     * so it will disappear when the request is finished. However the
+     * core filter may decide to set aside the tail end of a CGI
+     * response if the connection is pipelined. This turns out not to
+     * be a problem because the core will have read to the end of the
+     * stream so the bucket(s) that it sets aside will be the heap
+     * buckets created by pipe_bucket_read() above.
+     */
+    b->type        = &apr_bucket_type_pipe;
+    b->length      = (apr_size_t)(-1);
+    b->start       = -1;
+    b->data        = p;
+    
+    return b;
+}
+
+APU_DECLARE(apr_bucket *) apr_bucket_pipe_create(apr_file_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_pipe_make(b, p);
+}
+
+APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_pipe = {
+    "PIPE", 5, APR_BUCKET_DATA, 
+    apr_bucket_destroy_noop,
+    pipe_bucket_read,
+    apr_bucket_setaside_notimpl,
+    apr_bucket_split_notimpl,
+    apr_bucket_copy_notimpl
+};