c-protobuf/protobuf.h

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/*
* protobuf.h
*
* Created on: Dec 7, 2016
* Author: JohnJones
*/
#ifndef __PROTOBUF_H__
#define __PROTOBUF_H__
#include <stdio.h>
#include <stdint.h>
enum WireType {
WIRETYPE_VARINT,
WIRETYPE_64BIT,
WIRETYPE_LENGTH_DELIMITED,
WIRETYPE_START_GROUP,
WIRETYPE_END_GROUP,
WIRETYPE_32BIT
};
/***
* Encode a length delimited field into the buffer
* @param field_number the field number
* @param wire_type the wire type
* @param incoming the values
* @param incoming_length the lenght of incoming
* @param buffer the pointer to where to place the encoded value
* @param max_buffer_length the buffer length remaining
* @param bytes_written the number of bytes written
* @returns true(1) on success
*/
int protobuf_encode_length_delimited(int field_number, enum WireType wire_type, const char* incoming, size_t incoming_length,
unsigned char* buffer, size_t max_buffer_size, size_t* bytes_written);
int protobuf_decode_length_delimited(const unsigned char* buffer, size_t buffer_length, char** results, size_t *results_length, size_t* bytes_read);
/***
* encode a string into the buffer
* @param field_number the field number
* @param incoming the string value
* @param buffer the pointer to where to place the encoded value
* @param max_buffer_length the buffer length remaining
* @param bytes_written the number of bytes written
* @returns true(1) on success
*/
int protobuf_encode_string(int field_number, enum WireType wire_type, const char* incoming, unsigned char* buffer,
size_t max_buffer_length, size_t* bytes_written);
/**
* Pull a string from the protobuf buffer
* @param the buffer, positioned at the field size
* @param buffer_length the buffer length
* @param results the results (NOTE: will allocate memory)
* @param bytes_read the number of bytes read
* @returns true(1) on success
*/
int protobuf_decode_string(const unsigned char* buffer, size_t buffer_length, char** results, size_t* bytes_read);
/***
* encode a varint into the buffer
* @param field_number the field number
* @param field_type the field type
* @param incoming the value
* @param buffer the pointer to where to place the encoded value
* @param max_buffer_length the buffer length remaining
* @param bytes_written the number of bytes written
* @returns true(1) on success
*/
int protobuf_encode_varint(int field_number, enum WireType field_type, unsigned long long incoming, unsigned char* buffer,
size_t max_buffer_length, size_t* bytes_written);
int protobuf_decode_varint(const unsigned char* buffer, size_t buffer_length, unsigned long long* results, size_t* bytes_read);
/***
* retrieve field number and field type from current buffer at position 0
* @param buffer the incoming buffer
* @param buffer_length the length of the buffer
* @param field_no the resultant field number
* @param field_type the field type
* @param bytes_read the number of bytes read from the buffer
*/
int protobuf_decode_field_and_type(const unsigned char* buffer, int buffer_length, int *field_no, enum WireType *field_type, size_t* bytes_read);
#endif /* PROTOBUF_H_ */