#ifndef _PB_H_ #define _PB_H_ /* pb.h: Common parts for nanopb library. * Most of these are quite low-level stuff. For the high-level interface, * see pb_encode.h or pb_decode.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 /* Handly macro for suppressing unreferenced-parameter compiler warnings. */ #ifndef UNUSED #define UNUSED(x) (void)(x) #endif /* Compile-time assertion, used for checking compatible compilation options. */ #ifndef STATIC_ASSERT #define STATIC_ASSERT(COND,MSG) typedef char static_assertion_##MSG[(COND)?1:-1]; #endif /* Number of required fields to keep track of * (change here or on compiler command line). */ #ifndef PB_MAX_REQUIRED_FIELDS #define PB_MAX_REQUIRED_FIELDS 64 #endif #if PB_MAX_REQUIRED_FIELDS < 64 #error You should not lower PB_MAX_REQUIRED_FIELDS from the default value (64). #endif /* List of possible field types. These are used in the autogenerated code. * 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_FIXED32 = 0x02, /* fixed32, sfixed32, float */ PB_LTYPE_FIXED64 = 0x03, /* fixed64, sfixed64, double */ /* Marker for last packable field type. */ PB_LTYPE_LAST_PACKABLE = 0x03, /* Byte array with pre-allocated buffer. * data_size is the length of the allocated PB_BYTES_ARRAY structure. */ PB_LTYPE_BYTES = 0x04, /* String with pre-allocated buffer. * data_size is the maximum length. */ PB_LTYPE_STRING = 0x05, /* Submessage * submsg_fields is pointer to field descriptions */ PB_LTYPE_SUBMESSAGE = 0x06, /* Number of declared LTYPES */ PB_LTYPES_COUNT = 7, /****************** * 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 should be 0 (it is ignored, but sometimes * used to speculatively index an array). */ 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 if you need structures * larger than 256 bytes or field tags larger than 256. * The compiler should complain if your .proto has such * structures. Fix that by defining PB_FIELD_16BIT or * PB_FIELD_32BIT. */ typedef struct _pb_field_t pb_field_t; struct _pb_field_t { #if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT) 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 */ #elif defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT) uint16_t tag; pb_type_t type; uint8_t data_offset; int8_t size_offset; uint16_t data_size; uint16_t array_size; #else uint32_t tag; pb_type_t type; uint8_t data_offset; int8_t size_offset; uint32_t data_size; uint32_t array_size; #endif /* 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; /* This structure is used for 'bytes' arrays. * It has the number of bytes in the beginning, and after that an array. * Note that actual structs used will have a different length of bytes array. */ typedef struct { size_t size; uint8_t bytes[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. * * The callback can be null if you want to skip a field. */ typedef struct _pb_istream_t pb_istream_t; typedef struct _pb_ostream_t pb_ostream_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, const void *arg); } funcs; /* Free arg for use by callback */ void *arg; }; /* Wire types. Library user needs these only in encoder callbacks. */ typedef enum { PB_WT_VARINT = 0, PB_WT_64BIT = 1, PB_WT_STRING = 2, PB_WT_32BIT = 5 } pb_wire_type_t; /* These macros are used to declare pb_field_t's in the constant array. */ #define pb_membersize(st, m) (sizeof ((st*)0)->m) #define pb_arraysize(st, m) (pb_membersize(st, m) / pb_membersize(st, m[0])) #define pb_delta(st, m1, m2) ((int)offsetof(st, m1) - (int)offsetof(st, m2)) #define pb_delta_end(st, m1, m2) (offsetof(st, m1) - offsetof(st, m2) - pb_membersize(st, m2)) #define PB_LAST_FIELD {0,(pb_type_t) 0,0,0} #endif