X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=pb.h;h=b12debe976386ca7c5eae206da979fbfd4fad911;hb=e1b8a555f30d77a3c0094cf3678666b38f4b4bd3;hp=2cae75c561b5fd981cdaaf914a8a4748fc1c0da9;hpb=14bbe229974b516a82594ec6476488154e8957fa;p=apps%2Fagl-service-can-low-level.git diff --git a/pb.h b/pb.h index 2cae75c5..b12debe9 100644 --- a/pb.h +++ b/pb.h @@ -1,107 +1,299 @@ #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-0.2.1-dev + #include -#include // size_t +#include +#include -/* Lightweight input stream. - * If buf is NULL, read but don't store bytes. */ -typedef struct _pb_istream_t pb_istream_t; -struct _pb_istream_t -{ - bool (*callback)(pb_istream_t *stream, char *buf, size_t count); - void *state; // Free field for use by callback implementation - size_t bytes_left; -}; +#ifdef __GNUC__ +/* This just reduces memory requirements, but is not required. */ +#define pb_packed __attribute__((packed)) +#else +#define pb_packed +#endif -static inline bool pb_read(pb_istream_t *stream, char *buf, size_t count) -{ - bool status = stream->callback(stream, buf, count); - stream->bytes_left -= count; - return status; -} +/* Handly macro for suppressing unreferenced-parameter compiler warnings. */ +#ifndef UNUSED +#define UNUSED(x) (void)(x) +#endif -/* Lightweight output stream. */ -typedef struct _pb_ostream_t pb_ostream_t; -struct _pb_ostream_t -{ - bool (*callback)(pb_ostream_t *stream, const char *buf, size_t count); - void *state; // Free field for use by callback implementation - size_t bytes_written; -}; +/* 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 -static inline bool pb_write(pb_ostream_t *stream, const char *buf, size_t count) -{ - bool status = stream->callback(stream, buf, count); - stream->bytes_written += count; - return status; -} +/* 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 -/* List of possible decode/encode action types */ +#if PB_MAX_REQUIRED_FIELDS < 64 +#error You should not lower PB_MAX_REQUIRED_FIELDS from the default value (64). +#endif -typedef enum { - // Special case. Sets boolean field to true, continues parsing the data. - PB_ACT_HAS, - - // Standard integer types - PB_ACT_UINT32, - PB_ACT_SINT32, - PB_ACT_INT32, - PB_ACT_FIXED32, - PB_ACT_SFIXED32, - PB_ACT_UINT64, - PB_ACT_SINT64, - PB_ACT_INT64, - PB_ACT_FIXED64, - PB_ACT_SFIXED64, - PB_ACT_BOOL, - - // Standard float types - PB_ACT_FLOAT, - PB_ACT_DOUBLE, - - // Constant-sized array - PB_ACT_BYTES, - - // Constant-sized array, with null termination - PB_ACT_STRING, - - // Callback function pointer in field value - PB_ACT_SUBMESSAGE, - - PB_LAST_ACT -} pb_action_t; +/* 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 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 -// This structure is used in constants to specify struct fields. -typedef struct { - int field_number; - uint16_t offset; - pb_action_t action; - uint8_t fieldsize; -} pb_field_t; +/************************** + * Field repetition rules * + **************************/ -#define PB_LAST_FIELD {0,0,0,0} +#define PB_HTYPE_REQUIRED 0x00 +#define PB_HTYPE_OPTIONAL 0x10 +#define PB_HTYPE_REPEATED 0x20 +#define PB_HTYPE_MASK 0x30 -/* --- Types to use inside generated structures. --- */ +/******************** + * Allocation types * + ********************/ + +#define PB_ATYPE_STATIC 0x00 +#define PB_ATYPE_CALLBACK 0x40 +#define PB_ATYPE_MASK 0xC0 -// Byte array and size word. -// Note: because of variable length array, this type cannot be directly used. -// Autogenerated code declares the same type of fields but with explicit length. -typedef struct { +#define PB_ATYPE(x) ((x) & PB_ATYPE_MASK) +#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 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. + */ +struct _pb_bytes_array_t { size_t size; - char bytes[]; -} pb_bytearray_t; + uint8_t bytes[1]; +}; + +typedef struct _pb_bytes_array_t pb_bytes_array_t; -// This structure is used for giving the callback function. +/* 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_ATYPE_STATIC | 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_ATYPE_STATIC | 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_ATYPE_STATIC | 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_ATYPE_CALLBACK | PB_HTYPE_REQUIRED | 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_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | 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_ATYPE_CALLBACK | PB_HTYPE_REPEATED | 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