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#ifndef _PB_H_
#define _PB_H_
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#ifdef __GNUC__
/* This just reduces memory requirements, but is not required. */
#define pb_packed __attribute__((packed))
#else
#define pb_packed
#endif
/* Lightweight output stream. */
typedef struct _pb_ostream_t pb_ostream_t;
struct _pb_ostream_t
{
bool (*callback)(pb_ostream_t *stream, const uint8_t *buf, size_t count);
void *state; /* Free field for use by callback implementation */
size_t bytes_written;
};
/*static inline bool pb_write(pb_ostream_t *stream, const uint8_t *buf, size_t count)
{
bool status = stream->callback(stream, buf, count);
stream->bytes_written += count;
return status;
}*/
/* List of possible field types
* Least-significant 4 bits tell the scalar type
* Most-significant 4 bits specify repeated/required/packed etc.
*
* INT32 and UINT32 are treated the same, as are (U)INT64 and (S)FIXED*
* These types are simply casted to correct field type when they are
* assigned to the memory pointer.
* SINT* is different, though, because it is zig-zag coded.
*/
typedef enum {
/************************
* Field contents types *
************************/
/* Numeric types */
PB_LTYPE_VARINT = 0x00, /* int32, uint32, int64, uint64, bool, enum */
PB_LTYPE_SVARINT = 0x01, /* sint32, sint64 */
PB_LTYPE_FIXED = 0x02, /* fixed32, sfixed32, fixed64, sfixed64, float, double */
/* Marker for last packable field type. */
PB_LTYPE_LAST_PACKABLE = 0x02,
/* Byte array with pre-allocated buffer.
* data_size is the length of the allocated PB_BYTES_ARRAY structure. */
PB_LTYPE_BYTES = 0x03,
/* String with pre-allocated buffer.
* data_size is the maximum length. */
PB_LTYPE_STRING = 0x04,
/* Submessage
* submsg_fields is pointer to field descriptions */
PB_LTYPE_SUBMESSAGE = 0x05,
/* Number of declared LTYPES */
PB_LTYPES_COUNT = 6,
/******************
* Modifier flags *
******************/
/* Just the basic, write data at data_offset */
PB_HTYPE_REQUIRED = 0x00,
/* Write true at size_offset */
PB_HTYPE_OPTIONAL = 0x10,
/* Read to pre-allocated array
* Maximum number of entries is array_size,
* actual number is stored at size_offset */
PB_HTYPE_ARRAY = 0x20,
/* Works for all required/optional/repeated fields.
* data_offset points to pb_callback_t structure.
* LTYPE is ignored. */
PB_HTYPE_CALLBACK = 0x30
} pb_packed pb_type_t;
#define PB_HTYPE(x) ((x) & 0xF0)
#define PB_LTYPE(x) ((x) & 0x0F)
/* This structure is used in auto-generated constants
* to specify struct fields.
* You can change field sizes here if you need structures
* larger than 256 bytes or field tags larger than 256.
* The compiler should complain if your .proto has such
* structures ("initializer too large for type").
*/
typedef struct _pb_field_t pb_field_t;
struct _pb_field_t {
uint8_t tag;
pb_type_t type;
uint8_t data_offset; /* Offset of field data, relative to previous field. */
int8_t size_offset; /* Offset of array size or has-boolean, relative to data */
uint8_t data_size; /* Data size in bytes for a single item */
uint8_t array_size; /* Maximum number of entries in array */
/* Field definitions for submessage
* OR default value for all other non-array, non-callback types
* If null, then field will zeroed. */
const void *ptr;
} pb_packed;
#define PB_LAST_FIELD {0,0,0,0}
/* This structure is used for 'bytes' arrays.
* It has the number of bytes in the beginning, and after that an array. */
#define PB_BYTES_ARRAY(buffersize) \
struct { \
size_t size; \
uint8_t bytes[buffersize]; \
}
typedef PB_BYTES_ARRAY(1) pb_bytes_array_t;
/* This structure is used for giving the callback function.
* It is stored in the message structure and filled in by the method that
* calls pb_decode.
*
* The decoding callback will be given a limited-length stream
* If the wire type was string, the length is the length of the string.
* If the wire type was a varint/fixed32/fixed64, the length is the length
* of the actual value.
* The function may be called multiple times (especially for repeated types,
* but also otherwise if the message happens to contain the field multiple
* times.)
*
* The encoding callback will receive the actual output stream.
* It should write all the data in one call, including the field tag and
* wire type. It can write multiple fields.
*/
typedef struct _pb_istream_t pb_istream_t;
typedef struct _pb_callback_t pb_callback_t;
struct _pb_callback_t {
union {
bool (*decode)(pb_istream_t *stream, const pb_field_t *field, void *arg);
bool (*encode)(pb_ostream_t *stream, const pb_field_t *field, void *arg);
} funcs;
/* Free arg for use by callback */
void *arg;
};
#endif
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