I'm going to use protocol buffers in http post data, seems
SerializeToString can be used to generate binary string, but what if
the data is very large, is all data serialize in memory?

   The following is the proto file I defined, It is used for file

package fileupload;

message Range {
  required uint64 start = 1;
  required uint32 len = 2;

message Block {
  required Range r = 1;
  required bytes blk_hash = 2;
  required bytes blk_data = 3;

message DifferUpload {
  repeated Block blk = 1;


   Any solutions>

  Thanks in advance
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