PBC

PBC is a google protocol buffers library for C without code generation.

Quick Example

package tutorial;

message Person {
  required string name = 1;
  required int32 id = 2;        // Unique ID number for this person.
  optional string email = 3;

  enum PhoneType {
    MOBILE = 0;
    HOME = 1;
    WORK = 2;
  }

  message PhoneNumber {
    required string number = 1;
    optional PhoneType type = 2 [default = HOME];
  }

  repeated PhoneNumber phone = 4;
}

struct pbc_rmessage * m = pbc_rmessage_new(env, "tutorial.Person", slice);
printf("name = %s\n", pbc_rmessage_string(m , "name" , 0 , NULL));
printf("id = %d\n", pbc_rmessage_integer(m , "id" , 0 , NULL));
printf("email = %s\n", pbc_rmessage_string(m , "email" , 0 , NULL));

int phone_n = pbc_rmessage_size(m, "phone");
int i;

for (i=0;i<phone_n;i++) {
	struct pbc_rmessage * p = pbc_rmessage_message(m , "phone", i);
	printf("\tnumber[%d] = %s\n",i,pbc_rmessage_string(p , "number", i ,NULL));
	printf("\ttype[%d] = %s\n",i,pbc_rmessage_string(p, "type", i, NULL));
}

pbc_rmessage_delete(m);

Message API

You can use wmessage for encoding , and rmessage for decoding.

See test/addressbook.c for details.

Pattern API

If you need better performance , you can use pbc_pattern_xxx api .

See test/pattern.c for details.

Pattern api is faster and less memory used because it can access data in native C struct.

Extension

PBC support extension in a very simple way . PBC add a specific prefix to every extension field name.

Service

Not supported

Enum

With message API , you can use both string and integer as enum type . They must be integer in Pattern API.

Lua bindings

cd bindings/lua && make

See https://github.com/cloudwu/pbc/tree/master/binding/lua/README.md

Question ?

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• My Blog : http://blog.codingnow.com
• Design : http://blog.codingnow.com/2011/12/protocol_buffers_for_c.html (in Chinese)
• Build for Visual Studio 2012 : https://github.com/miaodadao/pbc