X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=pb.h;h=cd3f465e8b8c16613ecfc77a7b9159ff357a3797;hb=69085d93877ef75ca28505487d8a1335a4b7fa6c;hp=99e4bf7ee97d06d26babb150ec910e82f32410b8;hpb=84304b343a4b06a7918bc80ab45f08d1cae0b9cb;p=apps%2Fagl-service-can-low-level.git diff --git a/pb.h b/pb.h index 99e4bf7e..cd3f465e 100644 --- a/pb.h +++ b/pb.h @@ -1,60 +1,49 @@ #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 + */ + +#define NANOPB_VERSION nanopb-0.2.0-dev + #include -#include // size_t +#include #include #ifdef __GNUC__ -// This just reduces memory requirements, but is not required. +/* This just reduces memory requirements, but is not required. */ #define pb_packed __attribute__((packed)) #else #define pb_packed #endif -/* Lightweight input stream. - * If buf is NULL, read but don't store bytes. - * You have to provide a callback function for reading. - * You can use state to store your own data (e.g. buffer pointer), - * and rely on pb_read to verify that no-body reads past bytes_left. - * However, substreams may change bytes_left so don't use that to - * compute any pointers. - */ -typedef struct _pb_istream_t pb_istream_t; -struct _pb_istream_t -{ - bool (*callback)(pb_istream_t *stream, uint8_t *buf, size_t count); - void *state; // Free field for use by callback implementation - size_t bytes_left; -}; +/* Handly macro for suppressing unreferenced-parameter compiler warnings. */ +#ifndef UNUSED +#define UNUSED(x) (void)(x) +#endif -static inline bool pb_read(pb_istream_t *stream, uint8_t *buf, size_t count) -{ - if (stream->bytes_left < count) - return false; - - bool status = stream->callback(stream, buf, count); - stream->bytes_left -= count; - return status; -} +/* Compile-time assertion, used for checking compatible compilation options. + * If this fails on your compiler for some reason, use #define STATIC_ASSERT + * to disable it. */ +#ifndef STATIC_ASSERT +#define STATIC_ASSERT(COND,MSG) typedef char STATIC_ASSERT_MSG(MSG, __LINE__, __COUNTER__)[(COND)?1:-1]; +#define STATIC_ASSERT_MSG(MSG, LINE, COUNTER) STATIC_ASSERT_MSG_(MSG, LINE, COUNTER) +#define STATIC_ASSERT_MSG_(MSG, LINE, COUNTER) static_assertion_##MSG##LINE##COUNTER +#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; -}; +/* 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 -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; -} +#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 +/* 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. * @@ -64,116 +53,252 @@ static inline bool pb_write(pb_ostream_t *stream, const uint8_t *buf, size_t cou * SINT* is different, though, because it is zig-zag coded. */ -typedef enum { - // Standard integer types - PB_LTYPE_UINT32 = 0x00, - PB_LTYPE_INT32 = 0x00, - PB_LTYPE_SINT32 = 0x01, - PB_LTYPE_FIXED32 = 0x02, - PB_LTYPE_SFIXED32 = 0x02, - PB_LTYPE_UINT64 = 0x03, - PB_LTYPE_INT64 = 0x03, - PB_LTYPE_SINT64 = 0x04, - PB_LTYPE_FIXED64 = 0x05, - PB_LTYPE_SFIXED64 = 0x05, - PB_LTYPE_BOOL = 0x06, - PB_LTYPE_ENUM = 0x07, - - // Standard float types - PB_LTYPE_FLOAT = 0x08, - PB_LTYPE_DOUBLE = 0x09, - - // Byte array with pre-allocated buffer. - // data_size is the length of the allocated PB_BYTES_ARRAY structure. - PB_LTYPE_BYTES = 0x0A, - - // String with pre-allocated buffer. - // data_size is the maximum length. - PB_LTYPE_STRING = 0x0B, - - // Submessage - // submsg_fields is pointer to field descriptions - PB_LTYPE_SUBMESSAGE = 0x0C, - - ///////////// - // 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; +typedef uint8_t pb_type_t; + +/************************ + * Field contents types * + ************************/ + +/* Numeric types */ +#define PB_LTYPE_VARINT 0x00 /* int32, uint32, int64, uint64, bool, enum */ +#define PB_LTYPE_SVARINT 0x01 /* sint32, sint64 */ +#define PB_LTYPE_FIXED32 0x02 /* fixed32, sfixed32, float */ +#define PB_LTYPE_FIXED64 0x03 /* fixed64, sfixed64, double */ + +/* Marker for last packable field type. */ +#define PB_LTYPE_LAST_PACKABLE 0x03 + +/* Byte array with pre-allocated buffer. + * data_size is the length of the allocated PB_BYTES_ARRAY structure. */ +#define PB_LTYPE_BYTES 0x04 + +/* String with pre-allocated buffer. + * data_size is the maximum length. */ +#define PB_LTYPE_STRING 0x05 + +/* Submessage + * submsg_fields is pointer to field descriptions */ +#define PB_LTYPE_SUBMESSAGE 0x06 + +/* Number of declared LTYPES */ +#define PB_LTYPES_COUNT 7 +#define PB_LTYPE_MASK 0x0F + +/****************** + * Modifier flags * + ******************/ + +/* Just the basic, write data at data_offset */ +#define PB_HTYPE_REQUIRED 0x00 + +/* Write true at size_offset */ +#define PB_HTYPE_OPTIONAL 0x10 + +/* Read to pre-allocated array + * Maximum number of entries is array_size, + * actual number is stored at size_offset */ +#define PB_HTYPE_REPEATED 0x20 -#define PB_HTYPE(x) ((x) & 0xF0) -#define PB_LTYPE(x) ((x) & 0x0F) +/* Works for all required/optional/repeated fields. + * data_offset points to pb_callback_t structure. + * LTYPE should be valid or 0 (it is ignored, but + * sometimes used to speculatively index an array). */ +#define PB_HTYPE_CALLBACK 0x30 + +#define PB_HTYPE_MASK 0xF0 + +#define PB_HTYPE(x) ((x) & PB_HTYPE_MASK) +#define PB_LTYPE(x) ((x) & PB_LTYPE_MASK) /* This structure is used in auto-generated constants * to specify struct fields. - * You can change field sizes here if you need structures + * 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 ("initializer too large for type"). + * 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 actual data or array start - uint8_t size_offset; // Offset of array size or has-boolean - uint8_t data_size; // Data size in bytes for a single item - uint8_t array_size; // Maximum number of entries in array + 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. + /* 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. -// -// 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. +/* 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. + */ +struct _pb_bytes_array_t { + size_t size; + uint8_t bytes[1]; +}; + +typedef struct _pb_bytes_array_t 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, void *arg); + bool (*encode)(pb_ostream_t *stream, const pb_field_t *field, const void *arg); } funcs; - // Free arg for use by callback + /* Free arg for use by callback */ void *arg; }; -#endif \ No newline at end of file +/* 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) \ + ? offsetof(st, m1) \ + : offsetof(st, m1) - offsetof(st, m2) - pb_membersize(st, m2)) +#define PB_LAST_FIELD {0,(pb_type_t) 0,0,0,0,0,0} + +/* 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, pm, ltype, ptr) \ + {tag, PB_HTYPE_REQUIRED | ltype, \ + pb_delta_end(st, m, pm), 0, pb_membersize(st, m), 0, ptr} + +/* Optional fields add the delta to the has_ variable. */ +#define PB_OPTIONAL_STATIC(tag, st, m, pm, ltype, ptr) \ + {tag, PB_HTYPE_OPTIONAL | ltype, \ + pb_delta_end(st, m, pm), \ + pb_delta(st, has_ ## m, m), \ + 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, pm, ltype, ptr) \ + {tag, PB_HTYPE_REPEATED | ltype, \ + pb_delta_end(st, m, pm), \ + pb_delta(st, m ## _count, m), \ + pb_membersize(st, m[0]), \ + pb_arraysize(st, m), ptr} + +/* Callbacks are much like required fields except with special datatype. */ +#define PB_REQUIRED_CALLBACK(tag, st, m, pm, ltype, ptr) \ + {tag, PB_HTYPE_CALLBACK | ltype, \ + pb_delta_end(st, m, pm), 0, pb_membersize(st, m), 0, ptr} + +#define PB_OPTIONAL_CALLBACK(tag, st, m, pm, ltype, ptr) \ + {tag, PB_HTYPE_CALLBACK | ltype, \ + pb_delta_end(st, m, pm), 0, pb_membersize(st, m), 0, ptr} + +#define PB_REPEATED_CALLBACK(tag, st, m, pm, ltype, ptr) \ + {tag, PB_HTYPE_CALLBACK | ltype, \ + pb_delta_end(st, m, pm), 0, pb_membersize(st, m), 0, 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_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_VARINT +#define PB_LTYPE_MAP_UINT64 PB_LTYPE_VARINT + +/* This is the actual macro used in field descriptions. + * It takes these arguments: + * - Field tag number + * - Field type: BOOL, BYTES, DOUBLE, ENUM, FIXED32, FIXED64, + * FLOAT, INT32, INT64, MESSAGE, SFIXED32, SFIXED64 + * SINT32, SINT64, STRING, UINT32 or UINT64 + * - Field rules: REQUIRED, OPTIONAL or REPEATED + * - Allocation: STATIC or CALLBACK + * - 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, message, field, prevfield, ptr) \ + PB_ ## rules ## _ ## allocation(tag, 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. + */ +#ifdef PB_NO_ERRMSG +#define PB_RETURN_ERROR(stream,msg) return false +#define PB_GET_ERROR(stream) "(errmsg disabled)" +#else +#define PB_RETURN_ERROR(stream,msg) \ + do {\ + if ((stream)->errmsg == NULL) \ + (stream)->errmsg = (msg); \ + return false; \ + } while(0) +#define PB_GET_ERROR(stream) ((stream)->errmsg ? (stream)->errmsg : "(none)") +#endif + +#endif