diff options
Diffstat (limited to 'example_unions')
-rw-r--r-- | example_unions/Makefile | 17 | ||||
-rw-r--r-- | example_unions/decode.c | 96 | ||||
-rw-r--r-- | example_unions/encode.c | 85 | ||||
-rw-r--r-- | example_unions/unionproto.proto | 30 |
4 files changed, 0 insertions, 228 deletions
diff --git a/example_unions/Makefile b/example_unions/Makefile deleted file mode 100644 index 29514ca9..00000000 --- a/example_unions/Makefile +++ /dev/null @@ -1,17 +0,0 @@ -CFLAGS=-ansi -Wall -Werror -I .. -g -O0 -DEPS=../pb_decode.c ../pb_decode.h ../pb_encode.c ../pb_encode.h ../pb.h - -all: encode decode - ./encode 1 | ./decode - ./encode 2 | ./decode - ./encode 3 | ./decode - -clean: - rm -f encode unionproto.pb.h unionproto.pb.c - -%: %.c $(DEPS) unionproto.pb.h unionproto.pb.c - $(CC) $(CFLAGS) -o $@ $< ../pb_decode.c ../pb_encode.c unionproto.pb.c - -unionproto.pb.h unionproto.pb.c: unionproto.proto ../generator/nanopb_generator.py - protoc -I. -I../generator -I/usr/include -ounionproto.pb $< - python ../generator/nanopb_generator.py unionproto.pb diff --git a/example_unions/decode.c b/example_unions/decode.c deleted file mode 100644 index b9f4af55..00000000 --- a/example_unions/decode.c +++ /dev/null @@ -1,96 +0,0 @@ -/* This program reads a message from stdin, detects its type and decodes it. - */ - -#include <stdio.h> -#include <string.h> -#include <stdlib.h> - -#include <pb_decode.h> -#include "unionproto.pb.h" - -/* This function reads manually the first tag from the stream and finds the - * corresponding message type. It doesn't yet decode the actual message. - * - * Returns a pointer to the MsgType_fields array, as an identifier for the - * message type. Returns null if the tag is of unknown type or an error occurs. - */ -const pb_field_t* decode_unionmessage_type(pb_istream_t *stream) -{ - pb_wire_type_t wire_type; - uint32_t tag; - bool eof; - - while (pb_decode_tag(stream, &wire_type, &tag, &eof)) - { - if (wire_type == PB_WT_STRING) - { - const pb_field_t *field; - for (field = UnionMessage_fields; field->tag != 0; field++) - { - if (field->tag == tag && (field->type & PB_LTYPE_SUBMESSAGE)) - { - /* Found our field. */ - return field->ptr; - } - } - } - - /* Wasn't our field.. */ - pb_skip_field(stream, wire_type); - } - - return NULL; -} - -bool decode_unionmessage_contents(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct) -{ - pb_istream_t substream; - bool status; - if (!pb_make_string_substream(stream, &substream)) - return false; - - status = pb_decode(&substream, fields, dest_struct); - pb_close_string_substream(stream, &substream); - return status; -} - -int main() -{ - /* Read the data into buffer */ - uint8_t buffer[512]; - size_t count = fread(buffer, 1, sizeof(buffer), stdin); - pb_istream_t stream = pb_istream_from_buffer(buffer, count); - - const pb_field_t *type = decode_unionmessage_type(&stream); - bool status = false; - - if (type == MsgType1_fields) - { - MsgType1 msg = {}; - status = decode_unionmessage_contents(&stream, MsgType1_fields, &msg); - printf("Got MsgType1: %d\n", msg.value); - } - else if (type == MsgType2_fields) - { - MsgType2 msg = {}; - status = decode_unionmessage_contents(&stream, MsgType2_fields, &msg); - printf("Got MsgType2: %s\n", msg.value ? "true" : "false"); - } - else if (type == MsgType3_fields) - { - MsgType3 msg = {}; - status = decode_unionmessage_contents(&stream, MsgType3_fields, &msg); - printf("Got MsgType3: %d %d\n", msg.value1, msg.value2); - } - - if (!status) - { - printf("Decode failed: %s\n", PB_GET_ERROR(&stream)); - return 1; - } - - return 0; -} - - - diff --git a/example_unions/encode.c b/example_unions/encode.c deleted file mode 100644 index e124bf91..00000000 --- a/example_unions/encode.c +++ /dev/null @@ -1,85 +0,0 @@ -/* This program takes a command line argument and encodes a message in - * one of MsgType1, MsgType2 or MsgType3. - */ - -#include <stdio.h> -#include <string.h> -#include <stdlib.h> - -#include <pb_encode.h> -#include "unionproto.pb.h" - -/* This function is the core of the union encoding process. It handles - * the top-level pb_field_t array manually, in order to encode a correct - * field tag before the message. The pointer to MsgType_fields array is - * used as an unique identifier for the message type. - */ -bool encode_unionmessage(pb_ostream_t *stream, const pb_field_t messagetype[], const void *message) -{ - const pb_field_t *field; - for (field = UnionMessage_fields; field->tag != 0; field++) - { - if (field->ptr == messagetype) - { - /* This is our field, encode the message using it. */ - if (!pb_encode_tag_for_field(stream, field)) - return false; - - return pb_encode_submessage(stream, messagetype, message); - } - } - - /* Didn't find the field for messagetype */ - return false; -} - -int main(int argc, char **argv) -{ - if (argc != 2) - { - fprintf(stderr, "Usage: %s (1|2|3)\n", argv[0]); - return 1; - } - - uint8_t buffer[512]; - pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer)); - - bool status = false; - int msgtype = atoi(argv[1]); - if (msgtype == 1) - { - /* Send message of type 1 */ - MsgType1 msg = {42}; - status = encode_unionmessage(&stream, MsgType1_fields, &msg); - } - else if (msgtype == 2) - { - /* Send message of type 2 */ - MsgType2 msg = {true}; - status = encode_unionmessage(&stream, MsgType2_fields, &msg); - } - else if (msgtype == 3) - { - /* Send message of type 3 */ - MsgType3 msg = {3, 1415}; - status = encode_unionmessage(&stream, MsgType3_fields, &msg); - } - else - { - fprintf(stderr, "Unknown message type: %d\n", msgtype); - return 2; - } - - if (!status) - { - fprintf(stderr, "Encoding failed!\n"); - return 3; - } - else - { - fwrite(buffer, 1, stream.bytes_written, stdout); - return 0; /* Success */ - } -} - - diff --git a/example_unions/unionproto.proto b/example_unions/unionproto.proto deleted file mode 100644 index d7c9de2d..00000000 --- a/example_unions/unionproto.proto +++ /dev/null @@ -1,30 +0,0 @@ -// This is an example of how to handle 'union' style messages -// with nanopb, without allocating memory for all the message types. -// -// There is no official type in Protocol Buffers for describing unions, -// but they are commonly implemented by filling out exactly one of -// several optional fields. - -message MsgType1 -{ - required int32 value = 1; -} - -message MsgType2 -{ - required bool value = 1; -} - -message MsgType3 -{ - required int32 value1 = 1; - required int32 value2 = 2; -} - -message UnionMessage -{ - optional MsgType1 msg1 = 1; - optional MsgType2 msg2 = 2; - optional MsgType3 msg3 = 3; -} - |