Add proper per-file copyright notices/licenses and top-level license.

[bluesky.git] / bluesky / serialize.c

diff --git a/bluesky/serialize.c b/bluesky/serialize.c
index 792b01a..fc3cd31 100644 (file)
--- a/bluesky/serialize.c
+++ b/bluesky/serialize.c
@@ -3,7 +3,29 @@
  * Copyright (C) 2009  The Regents of the University of California
  * Written by Michael Vrable <mvrable@cs.ucsd.edu>
  *
- * TODO: Licensing
+ * 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. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS 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 REGENTS OR 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.
  */
 
 #include <stdint.h>
@@ -270,3 +292,90 @@ void bluesky_serialize_cloudlog(BlueSkyCloudLog *log,
         }
     }
 }
+
+/* Deserialize data from the journal or a cloud segment back into the in-memory
+ * cloud log item format. */
+void bluesky_deserialize_cloudlog(BlueSkyCloudLog *item,
+                                  const char *data,
+                                  size_t len)
+{
+    const char *data1, *data2, *data3;
+    size_t len1, len2, len3;
+    int type;
+    BlueSkyCloudID id;
+    g_assert(len > 4);
+
+    /* Auto-detect the format: either the journal or cloud log, based on the
+     * magic number at the start */
+    if (memcmp(data, JOURNAL_MAGIC, 4) == 0) {
+        g_assert(len >= sizeof(struct log_header));
+        struct log_header *header = (struct log_header *)data;
+        type = header->type - '0';
+        len1 = GUINT32_FROM_LE(header->size1);
+        len2 = GUINT32_FROM_LE(header->size2);
+        len3 = GUINT32_FROM_LE(header->size3);
+        id = header->id;
+        data1 = data + sizeof(struct log_header);
+        data2 = data1 + len1;
+        data3 = data2 + len2;
+        g_assert(data3 + len3 - data <= len);
+        item->type = header->type - '0';
+        item->inum = GUINT64_FROM_LE(header->inum);
+    } else if (memcmp(data, CLOUDLOG_MAGIC, 4) == 0) {
+        g_assert(len >= sizeof(struct cloudlog_header));
+        struct cloudlog_header *header = (struct cloudlog_header *)data;
+        type = header->type - '0';
+        len1 = GUINT32_FROM_LE(header->size1);
+        len2 = GUINT32_FROM_LE(header->size2);
+        len3 = GUINT32_FROM_LE(header->size3);
+        id = header->id;
+        data1 = data + sizeof(struct cloudlog_header);
+        data2 = data1 + len1;
+        data3 = data2 + len2;
+        g_assert(data3 + len3 - data <= len);
+        item->type = header->type - '0';
+        item->inum = GUINT64_FROM_LE(header->inum);
+    } else {
+        g_warning("Deserializing garbage cloud log item!");
+        return;
+    }
+
+    if (memcmp(&id, &item->id, sizeof(BlueSkyCloudID)) != 0) {
+        g_warning("ID does not match expected value!\n");
+    }
+
+    BlueSkyFS *fs = item->fs;
+
+    bluesky_string_unref(item->data);
+    item->data = NULL;
+    item->data_size = len1;
+
+    int link_count = len2 / sizeof(BlueSkyCloudID);
+    GArray *new_links = g_array_new(FALSE, TRUE, sizeof(BlueSkyCloudLog *));
+    for (int i = 0; i < link_count; i++) {
+        BlueSkyCloudID id;
+        g_assert(len2 >= sizeof(id));
+        memcpy(&id, data2, sizeof(id));
+        data2 += sizeof(id); len2 -= sizeof(id);
+
+        BlueSkyCloudLog *ref = bluesky_cloudlog_get(fs, id);
+        if (ref != NULL) {
+            g_mutex_lock(ref->lock);
+            g_assert(len3 >= sizeof(ref->location));
+            memcpy(&ref->location, data3, sizeof(ref->location));
+            ref->location_flags |= CLOUDLOG_CLOUD;
+            data3 += sizeof(ref->location); len3 -= sizeof(ref->location);
+            g_mutex_unlock(ref->lock);
+        }
+
+        g_array_append_val(new_links, ref);
+    }
+
+    for (int i = 0; i < item->links->len; i++) {
+        BlueSkyCloudLog *c = g_array_index(item->links,
+                                           BlueSkyCloudLog *, i);
+        bluesky_cloudlog_unref(c);
+    }
+    g_array_unref(item->links);
+    item->links = new_links;
+}