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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file tinybson.h
*
* A simple subset SAX-style BSON parser and generator. See http://bsonspec.org
*
* Some types and defines taken from the standalone BSON parser/generator
* in the Mongo C connector.
*/
#ifndef _TINYBSON_H
#define _TINYBSON_H
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
/** subset of the BSON node types we might care about */
typedef enum {
BSON_EOO = 0,
BSON_DOUBLE = 1,
BSON_STRING = 2,
BSON_OBJECT = 3,
BSON_ARRAY = 4,
BSON_BINDATA = 5,
BSON_UNDEFINED = 6,
BSON_BOOL = 8,
BSON_DATE = 9,
BSON_NULL = 10,
BSON_INT = 16,
BSON_TIMESTAMP = 17,
BSON_LONG = 18
} bson_type_t;
typedef enum bson_binary_subtype {
BSON_BIN_BINARY = 0,
BSON_BIN_USER = 128
} bson_binary_subtype_t;
/**
* Maximum node name length.
*/
#define BSON_MAXNAME 32
/**
* Node structure passed to the callback.
*/
typedef struct bson_node_s
{
char name[BSON_MAXNAME];
bson_type_t type;
bson_binary_subtype_t subtype;
union {
int32_t i;
double d;
bool b;
};
} *bson_node_t;
typedef struct bson_decoder_s *bson_decoder_t;
/**
* Node callback.
*/
typedef int (* bson_decoder_callback)(bson_decoder_t decoder, void *private, bson_node_t node);
struct bson_decoder_s
{
int fd;
bson_decoder_callback callback;
void *private;
unsigned nesting;
struct bson_node_s node;
int32_t pending;
};
/**
* Initialise the decoder.
*
* @param decoder Decoder state structure to be initialised.
* @param fd File to read BSON data from.
* @param callback Callback to be invoked by bson_decoder_next
* @param private Callback private data, stored in node.
* @return Zero on success.
*/
__EXPORT int bson_decoder_init(bson_decoder_t decoder, int fd, bson_decoder_callback callback, void *private);
/**
* Process the next node from the stream and invoke the callback.
*
* @param decoder Decoder state, must have been initialised with bson_decoder_init.
* @return -1 if parsing encountered an error, 0 if the BSON stream has ended,
* otherwise the return value from the callback.
*/
__EXPORT int bson_decoder_next(bson_decoder_t decoder);
/**
* Copy node data.
*
* @param decoder Decoder state, must have been initialised with bson_decoder_init.
*/
__EXPORT int bson_decoder_copy_data(bson_decoder_t decoder, void *buf);
/**
* Report copyable data size.
*
* @param decoder Decoder state, must have been initialised with bson_decoder_init.
*/
__EXPORT size_t bson_decoder_data_pending(bson_decoder_t decoder);
/**
* Encoder state structure.
*/
typedef struct bson_encoder_s
{
int fd;
} *bson_encoder_t;
/**
* Initialze the encoder.
*/
__EXPORT int bson_encoder_init(bson_encoder_t encoder, int fd);
/**
* Finalise the encoded stream.
*/
__EXPORT int bson_encoder_fini(bson_encoder_t encoder);
/**
* Append an integer to the encoded stream.
*/
__EXPORT int bson_encoder_append_int(bson_encoder_t encoder, const char *name, int32_t value);
/**
* Append a double to the encoded stream
*/
__EXPORT int bson_encoder_append_double(bson_encoder_t encoder, const char *name, double value);
/**
* Append a string to the encoded stream.
*/
__EXPORT int bson_encoder_append_string(bson_encoder_t encoder, const char *name, const char *string);
/**
* Append a binary blob to the encoded stream.
*/
__EXPORT int bson_encoder_append_binary(bson_encoder_t encoder, const char *name, bson_binary_subtype_t subtype, size_t size, const void *data);
#endif
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