1 files changed, 98 insertions, 0 deletions
diff --git a/logd/SerializedLogEntry.h b/logd/SerializedLogEntry.h
new file mode 100644
index 000000000..f599abeaa
--- /dev/null
+++ b/logd/SerializedLogEntry.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <log/log.h>
+#include <log/log_read.h>
+
+#include "LogStatistics.h"
+#include "LogWriter.h"
+
+// These structs are packed into a single chunk of memory for each log type within a
+// SerializedLogChunk object.  Their message is contained immediately at the end of the struct.  The
+// address of the next log in the buffer is *this + sizeof(SerializedLogEntry) + msg_len_.  If that
+// value would overflow the chunk of memory associated with the SerializedLogChunk object, then a
+// new SerializedLogChunk must be allocated to contain the next SerializedLogEntry.
+class __attribute__((packed)) SerializedLogEntry {
+  public:
+    SerializedLogEntry(uid_t uid, pid_t pid, pid_t tid, uint64_t sequence, log_time realtime,
+                       uint16_t len)
+        : uid_(uid),
+          pid_(pid),
+          tid_(tid),
+          sequence_(sequence),
+          realtime_(realtime),
+          msg_len_(len) {}
+    SerializedLogEntry(const SerializedLogEntry& elem) = delete;
+    SerializedLogEntry& operator=(const SerializedLogEntry& elem) = delete;
+    ~SerializedLogEntry() {
+        // Never place anything in this destructor.  This class is in place constructed and never
+        // destructed.
+    }
+
+    LogStatisticsElement ToLogStatisticsElement(log_id_t log_id) const {
+        return LogStatisticsElement{
+                .uid = uid(),
+                .pid = pid(),
+                .tid = tid(),
+                .tag = IsBinary(log_id) ? MsgToTag(msg(), msg_len()) : 0,
+                .realtime = realtime(),
+                .msg = msg(),
+                .msg_len = msg_len(),
+                .dropped_count = 0,
+                .log_id = log_id,
+        };
+    }
+
+    bool Flush(LogWriter* writer, log_id_t log_id) const {
+        struct logger_entry entry = {};
+
+        entry.hdr_size = sizeof(struct logger_entry);
+        entry.lid = log_id;
+        entry.pid = pid();
+        entry.tid = tid();
+        entry.uid = uid();
+        entry.sec = realtime().tv_sec;
+        entry.nsec = realtime().tv_nsec;
+        entry.len = msg_len();
+
+        return writer->Write(entry, msg());
+    }
+
+    uid_t uid() const { return uid_; }
+    pid_t pid() const { return pid_; }
+    pid_t tid() const { return tid_; }
+    uint16_t msg_len() const { return msg_len_; }
+    uint64_t sequence() const { return sequence_; }
+    log_time realtime() const { return realtime_; }
+
+    char* msg() { return reinterpret_cast<char*>(this) + sizeof(*this); }
+    const char* msg() const { return reinterpret_cast<const char*>(this) + sizeof(*this); }
+    uint16_t total_len() const { return sizeof(*this) + msg_len_; }
+
+  private:
+    const uint32_t uid_;
+    const uint32_t pid_;
+    const uint32_t tid_;
+    const uint64_t sequence_;
+    const log_time realtime_;
+    const uint16_t msg_len_;
+};