Create protoc-gen-cppstream tool to auto-generate cpp proto field Ids.

It is very similiar to protoc-gen-javastream, which generates field Ids used
by ProtoOutputStream.cpp to dump protobuf data.

Bug: 65641021
Test: compile the streaming_proto:
      $ mmm -j frameworks/base/tools/streaming_proto/
      and run:
      $ PATH=$PATH:out/host/linux-x86/bin/protoc-gen-cppstream aprotoc
      --cppstream_out=tmp/
      frameworks/base/core/proto/android/service/procstats.proto
      frameworks/base/core/proto/android/util/common.proto

Change-Id: I68becc80b5166455455c5df28cd698601b4a1c1d

1 files changed, 21 insertions, 2 deletions

diff --git a/tools/streaming_proto/string_utils.cpp b/tools/streaming_proto/string_utils.cpp
index cc738c4c108e..bd34ab7aa44d 100644
--- a/tools/streaming_proto/string_utils.cpp
+++ b/tools/streaming_proto/string_utils.cpp
@@ -3,7 +3,7 @@
 #include <iostream>
 
 namespace android {
-namespace javastream_proto {
+namespace stream_proto {
 
 using namespace std;
 
@@ -89,7 +89,26 @@ replace_string(const string& str, const char replace, const char with)
     return result;
 }
 
-} // namespace javastream_proto
+vector<string>
+split(const string& str, const char delimiter)
+{
+    vector<string> result;
+    size_t base = 0, found = 0;
+    while (true) {
+        found = str.find_first_of(delimiter, base);
+        if (found != base) {
+            string part = str.substr(base, found - base);
+            if (!part.empty()) {
+                result.push_back(part);
+            }
+        }
+        if (found == str.npos) break;
+        base = found + 1;
+    }
+    return result;
+}
+
+} // namespace stream_proto
 } // namespace android