add NanoPB Protocol Buffers implementation

/* Common parts of the nanopb library. Most of these are quite low-level

 * stuff. For the high-level interface, see pb_encode.h and pb_decode.h.

 */

#ifndef PB_H_INCLUDED

#define PB_H_INCLUDED

/*****************************************************************

 * Nanopb compilation time options. You can change these here by *

 * uncommenting the lines, or on the compiler command line.      *

 *****************************************************************/

/* Enable support for dynamically allocated fields */

/* #define PB_ENABLE_MALLOC 1 */

/* Define this if your CPU / compiler combination does not support

 * unaligned memory access to packed structures. */

/* #define PB_NO_PACKED_STRUCTS 1 */

/* Increase the number of required fields that are tracked.

 * A compiler warning will tell if you need this. */

/* #define PB_MAX_REQUIRED_FIELDS 256 */

/* Add support for tag numbers > 255 and fields larger than 255 bytes. */

/* #define PB_FIELD_16BIT 1 */

/* Add support for tag numbers > 65536 and fields larger than 65536 bytes. */

/* #define PB_FIELD_32BIT 1 */

/* Disable support for error messages in order to save some code space. */

/* #define PB_NO_ERRMSG 1 */

/* Disable support for custom streams (support only memory buffers). */

/* #define PB_BUFFER_ONLY 1 */

/* Switch back to the old-style callback function signature.

 * This was the default until nanopb-0.2.1. */

/* #define PB_OLD_CALLBACK_STYLE */

/******************************************************************

 * You usually don't need to change anything below this line.     *

 * Feel free to look around and use the defined macros, though.   *

 ******************************************************************/

/* Version of the nanopb library. Just in case you want to check it in

 * your own program. */

#define NANOPB_VERSION nanopb-0.4.0-dev

/* Include all the system headers needed by nanopb. You will need the

 * definitions of the following:

 * - strlen, memcpy, memset functions

 * - [u]int_least8_t, uint_fast8_t, [u]int_least16_t, [u]int32_t, [u]int64_t

 * - size_t

 * - bool

 *

 * If you don't have the standard header files, you can instead provide

 * a custom header that defines or includes all this. In that case,

 * define PB_SYSTEM_HEADER to the path of this file.

 */

#ifdef PB_SYSTEM_HEADER

#include PB_SYSTEM_HEADER

#else

#include <stdint.h>

#include <stddef.h>

#include <stdbool.h>

#include <string.h>

#ifdef PB_ENABLE_MALLOC

#include <stdlib.h>

#endif

#endif

/* Macro for defining packed structures (compiler dependent).

 * This just reduces memory requirements, but is not required.

 */

#if defined(PB_NO_PACKED_STRUCTS)

    /* Disable struct packing */

#   define PB_PACKED_STRUCT_START

#   define PB_PACKED_STRUCT_END

#   define pb_packed

#elif defined(__GNUC__) || defined(__clang__)

    /* For GCC and clang */

#   define PB_PACKED_STRUCT_START

#   define PB_PACKED_STRUCT_END

#   define pb_packed __attribute__((packed))

#elif defined(__ICCARM__) || defined(__CC_ARM)

    /* For IAR ARM and Keil MDK-ARM compilers */

#   define PB_PACKED_STRUCT_START _Pragma("pack(push, 1)")

#   define PB_PACKED_STRUCT_END _Pragma("pack(pop)")

#   define pb_packed

#elif defined(_MSC_VER) && (_MSC_VER >= 1500)

    /* For Microsoft Visual C++ */

#   define PB_PACKED_STRUCT_START __pragma(pack(push, 1))

#   define PB_PACKED_STRUCT_END __pragma(pack(pop))

#   define pb_packed

#else

    /* Unknown compiler */

#   define PB_PACKED_STRUCT_START

#   define PB_PACKED_STRUCT_END

#   define pb_packed

#endif

/* Handly macro for suppressing unreferenced-parameter compiler warnings. */

#ifndef PB_UNUSED

#define PB_UNUSED(x) (void)(x)

#endif

/* Compile-time assertion, used for checking compatible compilation options.

 * If this does not work properly on your compiler, use

 * #define PB_NO_STATIC_ASSERT to disable it.

 *

 * But before doing that, check carefully the error message / place where it

 * comes from to see if the error has a real cause. Unfortunately the error

 * message is not always very clear to read, but you can see the reason better

 * in the place where the PB_STATIC_ASSERT macro was called.

 */

#ifndef PB_NO_STATIC_ASSERT

#ifndef PB_STATIC_ASSERT

#define PB_STATIC_ASSERT(COND,MSG) typedef char PB_STATIC_ASSERT_MSG(MSG, __LINE__, __COUNTER__)[(COND)?1:-1];

#define PB_STATIC_ASSERT_MSG(MSG, LINE, COUNTER) PB_STATIC_ASSERT_MSG_(MSG, LINE, COUNTER)

#define PB_STATIC_ASSERT_MSG_(MSG, LINE, COUNTER) pb_static_assertion_##MSG##LINE##COUNTER

#endif

#else

#define PB_STATIC_ASSERT(COND,MSG)

#endif

/* Number of required fields to keep track of. */

#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.

 */

typedef uint_least8_t pb_type_t;

/**** Field data types ****/

/* Numeric types */

#define PB_LTYPE_VARINT  0x00 /* int32, int64, enum, bool */

#define PB_LTYPE_UVARINT 0x01 /* uint32, uint64 */

#define PB_LTYPE_SVARINT 0x02 /* sint32, sint64 */

#define PB_LTYPE_FIXED32 0x03 /* fixed32, sfixed32, float */

#define PB_LTYPE_FIXED64 0x04 /* fixed64, sfixed64, double */

/* Marker for last packable field type. */

#define PB_LTYPE_LAST_PACKABLE 0x04

/* Byte array with pre-allocated buffer.

 * data_size is the length of the allocated PB_BYTES_ARRAY structure. */

#define PB_LTYPE_BYTES 0x05

/* String with pre-allocated buffer.

 * data_size is the maximum length. */

#define PB_LTYPE_STRING 0x06

/* Submessage

 * submsg_fields is pointer to field descriptions */

#define PB_LTYPE_SUBMESSAGE 0x07

/* Extension pseudo-field

 * The field contains a pointer to pb_extension_t */

#define PB_LTYPE_EXTENSION 0x08

/* Byte array with inline, pre-allocated byffer.

 * data_size is the length of the inline, allocated buffer.

 * This differs from PB_LTYPE_BYTES by defining the element as

 * pb_byte_t[data_size] rather than pb_bytes_array_t. */

#define PB_LTYPE_FIXED_LENGTH_BYTES 0x09

/* Number of declared LTYPES */

#define PB_LTYPES_COUNT 0x0A

#define PB_LTYPE_MASK 0x0F

/**** Field repetition rules ****/

#define PB_HTYPE_REQUIRED 0x00

#define PB_HTYPE_OPTIONAL 0x10

#define PB_HTYPE_REPEATED 0x20

#define PB_HTYPE_ONEOF    0x30

#define PB_HTYPE_MASK     0x30

/**** Field allocation types ****/

#define PB_ATYPE_STATIC   0x00

#define PB_ATYPE_POINTER  0x80

#define PB_ATYPE_CALLBACK 0x40

#define PB_ATYPE_MASK     0xC0

#define PB_ATYPE(x) ((x) & PB_ATYPE_MASK)

#define PB_HTYPE(x) ((x) & PB_HTYPE_MASK)

#define PB_LTYPE(x) ((x) & PB_LTYPE_MASK)

/* Data type used for storing sizes of struct fields

 * and array counts.

 */

#if defined(PB_FIELD_32BIT)

    typedef uint32_t pb_size_t;

    typedef int32_t pb_ssize_t;

#elif defined(PB_FIELD_16BIT)

    typedef uint_least16_t pb_size_t;

    typedef int_least16_t pb_ssize_t;

#else

    typedef uint_least8_t pb_size_t;

    typedef int_least8_t pb_ssize_t;

#endif

#define PB_SIZE_MAX ((pb_size_t)-1)

/* Data type for storing encoded data and other byte streams.

 * This typedef exists to support platforms where uint8_t does not exist.

 * You can regard it as equivalent on uint8_t on other platforms.

 */

typedef uint_least8_t pb_byte_t;

/* 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.

 */

PB_PACKED_STRUCT_START

typedef struct pb_field_s pb_field_t;

struct pb_field_s {

    pb_size_t tag;

    pb_type_t type;

    pb_size_t data_offset; /* Offset of field data, relative to previous field. */

    pb_ssize_t size_offset; /* Offset of array size or has-boolean, relative to data */

    pb_size_t data_size; /* Data size in bytes for a single item */

    pb_size_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;

PB_PACKED_STRUCT_END

/* Make sure that the standard integer types are of the expected sizes.

 * Otherwise fixed32/fixed64 fields can break.

 *

 * If you get errors here, it probably means that your stdint.h is not

 * correct for your platform.

 */

#ifndef PB_WITHOUT_64BIT

PB_STATIC_ASSERT(sizeof(int64_t) == 2 * sizeof(int32_t), INT64_T_WRONG_SIZE)

PB_STATIC_ASSERT(sizeof(uint64_t) == 2 * sizeof(uint32_t), UINT64_T_WRONG_SIZE)

#endif

/* 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.

 */

#define PB_BYTES_ARRAY_T(n) struct { pb_size_t size; pb_byte_t bytes[n]; }

#define PB_BYTES_ARRAY_T_ALLOCSIZE(n) ((size_t)n + offsetof(pb_bytes_array_t, bytes))

struct pb_bytes_array_s {

    pb_size_t size;

    pb_byte_t bytes[1];

};

typedef struct pb_bytes_array_s 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_s pb_istream_t;

typedef struct pb_ostream_s pb_ostream_t;

typedef struct pb_callback_s pb_callback_t;

struct pb_callback_s {

#ifdef PB_OLD_CALLBACK_STYLE

    /* Deprecated since nanopb-0.2.1 */

    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;

#else

    /* New function signature, which allows modifying arg contents in callback. */

    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 * const *arg);

    } funcs;

#endif    

    /* 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;

/* Structure for defining the handling of unknown/extension fields.

 * Usually the pb_extension_type_t structure is automatically generated,

 * while the pb_extension_t structure is created by the user. However,

 * if you want to catch all unknown fields, you can also create a custom

 * pb_extension_type_t with your own callback.

 */

typedef struct pb_extension_type_s pb_extension_type_t;

typedef struct pb_extension_s pb_extension_t;

struct pb_extension_type_s {

    /* Called for each unknown field in the message.

     * If you handle the field, read off all of its data and return true.

     * If you do not handle the field, do not read anything and return true.

     * If you run into an error, return false.

     * Set to NULL for default handler.

     */

    bool (*decode)(pb_istream_t *stream, pb_extension_t *extension,

                   uint32_t tag, pb_wire_type_t wire_type);

    /* Called once after all regular fields have been encoded.

     * If you have something to write, do so and return true.

     * If you do not have anything to write, just return true.

     * If you run into an error, return false.

     * Set to NULL for default handler.

     */

    bool (*encode)(pb_ostream_t *stream, const pb_extension_t *extension);

    /* Free field for use by the callback. */

    const void *arg;

};

struct pb_extension_s {

    /* Type describing the extension field. Usually you'll initialize

     * this to a pointer to the automatically generated structure. */

    const pb_extension_type_t *type;

    /* Destination for the decoded data. This must match the datatype

     * of the extension field. */

    void *dest;

    /* Pointer to the next extension handler, or NULL.

     * If this extension does not match a field, the next handler is

     * automatically called. */

    pb_extension_t *next;

    /* The decoder sets this to true if the extension was found.

     * Ignored for encoding. */

    bool found;

};

/* Memory allocation functions to use. You can define pb_realloc and

 * pb_free to custom functions if you want. */

#ifdef PB_ENABLE_MALLOC

#   ifndef pb_realloc

#       define pb_realloc(ptr, size) realloc(ptr, size)

#   endif

#   ifndef pb_free

#       define pb_free(ptr) free(ptr)

#   endif

#endif

/* This is used to inform about need to regenerate .pb.h/.pb.c files. */

#define PB_PROTO_HEADER_VERSION 30

/* These macros are used to declare pb_field_t's in the constant array. */

/* Size of a structure member, in bytes. */

#define pb_membersize(st, m) (sizeof ((st*)0)->m)

/* Number of entries in an array. */

#define pb_arraysize(st, m) (pb_membersize(st, m) / pb_membersize(st, m[0]))

/* Delta from start of one member to the start of another member. */

#define pb_delta(st, m1, m2) ((int)offsetof(st, m1) - (int)offsetof(st, m2))

/* Marks the end of the field list */

#define PB_LAST_FIELD {0,(pb_type_t) 0,0,0,0,0,0}

/* Macros for filling in the data_offset field */

/* data_offset for first field in a message */

#define PB_DATAOFFSET_FIRST(st, m1, m2) (offsetof(st, m1))

/* data_offset for subsequent fields */

#define PB_DATAOFFSET_OTHER(st, m1, m2) (offsetof(st, m1) - offsetof(st, m2) - pb_membersize(st, m2))

/* data offset for subsequent fields inside an union (oneof) */

#define PB_DATAOFFSET_UNION(st, m1, m2) (PB_SIZE_MAX)

/* Choose first/other based on m1 == m2 (deprecated, remains for backwards compatibility) */

#define PB_DATAOFFSET_CHOOSE(st, m1, m2) (int)(offsetof(st, m1) == offsetof(st, m2) \

                                  ? PB_DATAOFFSET_FIRST(st, m1, m2) \

                                  : PB_DATAOFFSET_OTHER(st, m1, m2))

/* Required fields are the simplest. They just have delta (padding) from

 * previous field end, and the size of the field. Pointer is used for

 * submessages and default values.

 */

#define PB_REQUIRED_STATIC(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_REQUIRED | ltype, \

    fd, 0, pb_membersize(st, m), 0, ptr}

/* Optional fields add the delta to the has_ variable. */

#define PB_OPTIONAL_STATIC(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_OPTIONAL | ltype, \

    fd, \

    pb_delta(st, has_ ## m, m), \

    pb_membersize(st, m), 0, ptr}

#define PB_SINGULAR_STATIC(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_OPTIONAL | ltype, \

    fd, 0, pb_membersize(st, m), 0, ptr}

/* Repeated fields have a _count field and also the maximum number of entries. */

#define PB_REPEATED_STATIC(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_REPEATED | ltype, \

    fd, \

    pb_delta(st, m ## _count, m), \

    pb_membersize(st, m[0]), \

    pb_arraysize(st, m), ptr}

/* Allocated fields carry the size of the actual data, not the pointer */

#define PB_REQUIRED_POINTER(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_POINTER | PB_HTYPE_REQUIRED | ltype, \

    fd, 0, pb_membersize(st, m[0]), 0, ptr}

/* Optional fields don't need a has_ variable, as information would be redundant */

#define PB_OPTIONAL_POINTER(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_POINTER | PB_HTYPE_OPTIONAL | ltype, \

    fd, 0, pb_membersize(st, m[0]), 0, ptr}

/* Same as optional fields*/

#define PB_SINGULAR_POINTER(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_POINTER | PB_HTYPE_OPTIONAL | ltype, \

    fd, 0, pb_membersize(st, m[0]), 0, ptr}

/* Repeated fields have a _count field and a pointer to array of pointers */

#define PB_REPEATED_POINTER(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_POINTER | PB_HTYPE_REPEATED | ltype, \

    fd, pb_delta(st, m ## _count, m), \

    pb_membersize(st, m[0]), 0, ptr}

/* Callbacks are much like required fields except with special datatype. */

#define PB_REQUIRED_CALLBACK(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_CALLBACK | PB_HTYPE_REQUIRED | ltype, \

    fd, 0, pb_membersize(st, m), 0, ptr}

#define PB_OPTIONAL_CALLBACK(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | ltype, \

    fd, 0, pb_membersize(st, m), 0, ptr}

#define PB_SINGULAR_CALLBACK(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | ltype, \

    fd, 0, pb_membersize(st, m), 0, ptr}

#define PB_REPEATED_CALLBACK(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_CALLBACK | PB_HTYPE_REPEATED | ltype, \

    fd, 0, pb_membersize(st, m), 0, ptr}

/* Optional extensions don't have the has_ field, as that would be redundant.

 * Furthermore, the combination of OPTIONAL without has_ field is used

 * for indicating proto3 style fields. Extensions exist in proto2 mode only,

 * so they should be encoded according to proto2 rules. To avoid the conflict,

 * extensions are marked as REQUIRED instead.

 */

#define PB_OPTEXT_STATIC(tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_REQUIRED | ltype, \

    0, \

    0, \

    pb_membersize(st, m), 0, ptr}

#define PB_OPTEXT_POINTER(tag, st, m, fd, ltype, ptr) \

    PB_OPTIONAL_POINTER(tag, st, m, fd, ltype, ptr)

#define PB_OPTEXT_CALLBACK(tag, st, m, fd, ltype, ptr) \

    PB_OPTIONAL_CALLBACK(tag, st, m, fd, ltype, ptr)

/* The mapping from protobuf types to LTYPEs is done using these macros. */

#define PB_LTYPE_MAP_BOOL               PB_LTYPE_VARINT

#define PB_LTYPE_MAP_BYTES              PB_LTYPE_BYTES

#define PB_LTYPE_MAP_DOUBLE             PB_LTYPE_FIXED64

#define PB_LTYPE_MAP_ENUM               PB_LTYPE_VARINT

#define PB_LTYPE_MAP_UENUM              PB_LTYPE_UVARINT

#define PB_LTYPE_MAP_FIXED32            PB_LTYPE_FIXED32

#define PB_LTYPE_MAP_FIXED64            PB_LTYPE_FIXED64

#define PB_LTYPE_MAP_FLOAT              PB_LTYPE_FIXED32

#define PB_LTYPE_MAP_INT32              PB_LTYPE_VARINT

#define PB_LTYPE_MAP_INT64              PB_LTYPE_VARINT

#define PB_LTYPE_MAP_MESSAGE            PB_LTYPE_SUBMESSAGE

#define PB_LTYPE_MAP_SFIXED32           PB_LTYPE_FIXED32

#define PB_LTYPE_MAP_SFIXED64           PB_LTYPE_FIXED64

#define PB_LTYPE_MAP_SINT32             PB_LTYPE_SVARINT

#define PB_LTYPE_MAP_SINT64             PB_LTYPE_SVARINT

#define PB_LTYPE_MAP_STRING             PB_LTYPE_STRING

#define PB_LTYPE_MAP_UINT32             PB_LTYPE_UVARINT

#define PB_LTYPE_MAP_UINT64             PB_LTYPE_UVARINT

#define PB_LTYPE_MAP_EXTENSION          PB_LTYPE_EXTENSION

#define PB_LTYPE_MAP_FIXED_LENGTH_BYTES PB_LTYPE_FIXED_LENGTH_BYTES

/* This is the actual macro used in field descriptions.

 * It takes these arguments:

 * - Field tag number

 * - Field type:   BOOL, BYTES, DOUBLE, ENUM, UENUM, FIXED32, FIXED64,

 *                 FLOAT, INT32, INT64, MESSAGE, SFIXED32, SFIXED64

 *                 SINT32, SINT64, STRING, UINT32, UINT64 or EXTENSION

 * - Field rules:  REQUIRED, OPTIONAL or REPEATED

 * - Allocation:   STATIC, CALLBACK or POINTER

 * - Placement: FIRST or OTHER, depending on if this is the first field in structure.

 * - Message name

 * - Field name

 * - Previous field name (or field name again for first field)

 * - Pointer to default value or submsg fields.

 */

#define PB_FIELD(tag, type, rules, allocation, placement, message, field, prevfield, ptr) \

        PB_ ## rules ## _ ## allocation(tag, message, field, \

        PB_DATAOFFSET_ ## placement(message, field, prevfield), \

        PB_LTYPE_MAP_ ## type, ptr)

/* Field description for repeated static fixed count fields.*/

#define PB_REPEATED_FIXED_COUNT(tag, type, placement, message, field, prevfield, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_REPEATED | PB_LTYPE_MAP_ ## type, \

    PB_DATAOFFSET_ ## placement(message, field, prevfield), \

    0, \

    pb_membersize(message, field[0]), \

    pb_arraysize(message, field), ptr}

/* Field description for oneof fields. This requires taking into account the

 * union name also, that's why a separate set of macros is needed.

 */

#define PB_ONEOF_STATIC(u, tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_ONEOF | ltype, \

    fd, pb_delta(st, which_ ## u, u.m), \

    pb_membersize(st, u.m), 0, ptr}

#define PB_ONEOF_POINTER(u, tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_POINTER | PB_HTYPE_ONEOF | ltype, \

    fd, pb_delta(st, which_ ## u, u.m), \

    pb_membersize(st, u.m[0]), 0, ptr}

#define PB_ONEOF_FIELD(union_name, tag, type, rules, allocation, placement, message, field, prevfield, ptr) \

        PB_ONEOF_ ## allocation(union_name, tag, message, field, \

        PB_DATAOFFSET_ ## placement(message, union_name.field, prevfield), \

        PB_LTYPE_MAP_ ## type, ptr)

#define PB_ANONYMOUS_ONEOF_STATIC(u, tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_STATIC | PB_HTYPE_ONEOF | ltype, \

    fd, pb_delta(st, which_ ## u, m), \

    pb_membersize(st, m), 0, ptr}

#define PB_ANONYMOUS_ONEOF_POINTER(u, tag, st, m, fd, ltype, ptr) \

    {tag, PB_ATYPE_POINTER | PB_HTYPE_ONEOF | ltype, \

    fd, pb_delta(st, which_ ## u, m), \

    pb_membersize(st, m[0]), 0, ptr}

#define PB_ANONYMOUS_ONEOF_FIELD(union_name, tag, type, rules, allocation, placement, message, field, prevfield, ptr) \

        PB_ANONYMOUS_ONEOF_ ## allocation(union_name, tag, message, field, \

        PB_DATAOFFSET_ ## placement(message, field, prevfield), \

        PB_LTYPE_MAP_ ## type, ptr)

/* These macros are used for giving out error messages.

 * They are mostly a debugging aid; the main error information

 * is the true/false return value from functions.

 * Some code space can be saved by disabling the error

 * messages if not used.

 *

 * PB_SET_ERROR() sets the error message if none has been set yet.

 *                msg must be a constant string literal.

 * PB_GET_ERROR() always returns a pointer to a string.

 * PB_RETURN_ERROR() sets the error and returns false from current

 *                   function.

 */

#ifdef PB_NO_ERRMSG

#define PB_SET_ERROR(stream, msg) PB_UNUSED(stream)

#define PB_GET_ERROR(stream) "(errmsg disabled)"

#else

#define PB_SET_ERROR(stream, msg) (stream->errmsg = (stream)->errmsg ? (stream)->errmsg : (msg))

#define PB_GET_ERROR(stream) ((stream)->errmsg ? (stream)->errmsg : "(none)")

#endif

#define PB_RETURN_ERROR(stream, msg) return PB_SET_ERROR(stream, msg), false

#endif

/* pb_common.h: Common support functions for pb_encode.c and pb_decode.c.

 * These functions are rarely needed by applications directly.

 */

#ifndef PB_COMMON_H_INCLUDED

#define PB_COMMON_H_INCLUDED

#include "pb.h"

#ifdef __cplusplus

extern "C" {

#endif

/* Iterator for pb_field_t list */

struct pb_field_iter_s {

    const pb_field_t *start;       /* Start of the pb_field_t array */

    const pb_field_t *pos;         /* Current position of the iterator */

    unsigned required_field_index; /* Zero-based index that counts only the required fields */

    void *dest_struct;             /* Pointer to start of the structure */

    void *pData;                   /* Pointer to current field value */

    void *pSize;                   /* Pointer to count/has field */

};

typedef struct pb_field_iter_s pb_field_iter_t;

/* Initialize the field iterator structure to beginning.

 * Returns false if the message type is empty. */

bool pb_field_iter_begin(pb_field_iter_t *iter, const pb_field_t *fields, void *dest_struct);

/* Advance the iterator to the next field.

 * Returns false when the iterator wraps back to the first field. */

bool pb_field_iter_next(pb_field_iter_t *iter);

/* Advance the iterator until it points at a field with the given tag.

 * Returns false if no such field exists. */

bool pb_field_iter_find(pb_field_iter_t *iter, uint32_t tag);

#ifdef __cplusplus

} /* extern "C" */

#endif

#endif