commit f619bc3873d1438d853c5cf0ce245de37c3eb103
author Daniele Di Proietto <ddiproietto@google.com> Mon Sep 25 17:18:46 2023 +0000
committer Daniele Di Proietto <ddiproietto@google.com> Tue Sep 26 10:39:00 2023 +0000
tree d295bba4b115879bd1018c63f238bc8cd902163d
parent f92196dfb6d701a3e0f7b9ea4042b193c4487e15

shared_lib: Add protozero zigzag decode functions

Change-Id: Ie25a76478dec0cd0ffece666fa0e709ddfc345d3

include/perfetto/public/pb_utils.h

diff --git a/include/perfetto/public/pb_utils.h b/include/perfetto/public/pb_utils.h
index ef4ed97..32ea759 100644
--- a/include/perfetto/public/pb_utils.h
+++ b/include/perfetto/public/pb_utils.h
@@ -123,4 +123,16 @@
          PERFETTO_STATIC_CAST(uint64_t, value >> 63);
 }
 
+static inline int32_t PerfettoPbZigZagDecode32(uint32_t value) {
+  uint32_t mask =
+      PERFETTO_STATIC_CAST(uint32_t, -PERFETTO_STATIC_CAST(int32_t, value & 1));
+  return PERFETTO_STATIC_CAST(int32_t, ((value >> 1) ^ mask));
+}
+
+static inline int64_t PerfettoPbZigZagDecode64(uint64_t value) {
+  uint64_t mask =
+      PERFETTO_STATIC_CAST(uint64_t, -PERFETTO_STATIC_CAST(int64_t, value & 1));
+  return PERFETTO_STATIC_CAST(int64_t, ((value >> 1) ^ mask));
+}
+
 #endif  // INCLUDE_PERFETTO_PUBLIC_PB_UTILS_H_