X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=pb.h;h=c0c25283e0143b4742ccca81d1cda53e1468f660;hb=fd9a79a06db00c6199a5dcaee22ed2cd8e3c3e9b;hp=fbdf185e850cf809b9bc2a940bd43caea97819ac;hpb=bb5dc04584f4e147cf3c892ab004ecd36ba7642b;p=apps%2Fagl-service-can-low-level.git diff --git a/pb.h b/pb.h index fbdf185e..c0c25283 100644 --- a/pb.h +++ b/pb.h @@ -1,25 +1,96 @@ +/* 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_ #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 - */ +/***************************************************************** + * Nanopb compilation time options. You can change these here by * + * uncommenting the lines, or on the compiler command line. * + *****************************************************************/ + +/* Define this if your CPU architecture is big endian, i.e. it + * stores the most-significant byte first. */ +/* #define __BIG_ENDIAN__ 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 */ -#define NANOPB_VERSION nanopb-0.1.9-dev +/****************************************************************** + * 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-0.2.3-dev + +/* Include all the system headers needed by nanopb. You will need the + * definitions of the following: + * - strlen, memcpy, memset functions + * - [u]int8_t, [u]int16_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 #include #include +#include +#endif -#ifdef __GNUC__ -/* This just reduces memory requirements, but is not required. */ -#define pb_packed __attribute__((packed)) +/* Macro for defining packed structures (compiler dependent). + * This just reduces memory requirements, but is not required. + */ +#if 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__) + /* For IAR ARM compiler */ +# 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 -#define pb_packed + /* Unknown compiler */ +# define PB_PACKED_STRUCT_START +# define PB_PACKED_STRUCT_END +# define pb_packed #endif -/* Handly macro for suppressing unreferenced-parameter compiler warnings. */ +/* Handly macro for suppressing unreferenced-parameter compiler warnings. */ #ifndef UNUSED #define UNUSED(x) (void)(x) #endif @@ -33,8 +104,7 @@ #define STATIC_ASSERT_MSG_(MSG, LINE, COUNTER) static_assertion_##MSG##LINE##COUNTER #endif -/* Number of required fields to keep track of - * (change here or on compiler command line). */ +/* Number of required fields to keep track of. */ #ifndef PB_MAX_REQUIRED_FIELDS #define PB_MAX_REQUIRED_FIELDS 64 #endif @@ -53,60 +123,53 @@ * 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, - PB_LTYPE_MASK = 0x0F, - - /****************** - * 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_HTYPE_MASK = 0xF0 -} pb_packed pb_type_t; +typedef uint8_t pb_type_t; + +/**** Field data 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 +/* Extension pseudo-field + * The field contains a pointer to pb_extension_t */ +#define PB_LTYPE_EXTENSION 0x07 + +/* Number of declared LTYPES */ +#define PB_LTYPES_COUNT 8 +#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_MASK 0x30 + +/**** Field allocation types ****/ + +#define PB_ATYPE_STATIC 0x00 +#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) @@ -118,6 +181,7 @@ typedef enum { * structures. Fix that by defining PB_FIELD_16BIT or * PB_FIELD_32BIT. */ +PB_PACKED_STRUCT_START typedef struct _pb_field_t pb_field_t; struct _pb_field_t { @@ -149,6 +213,18 @@ struct _pb_field_t { * 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. + * All kinds of things may break otherwise.. atleast all fixed* types. */ +STATIC_ASSERT(sizeof(int8_t) == 1, INT8_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(uint8_t) == 1, UINT8_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(int16_t) == 2, INT16_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(uint16_t) == 2, UINT16_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(int32_t) == 4, INT32_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(uint32_t) == 4, UINT32_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(int64_t) == 8, INT64_T_WRONG_SIZE) +STATIC_ASSERT(sizeof(uint64_t) == 8, UINT64_T_WRONG_SIZE) /* This structure is used for 'bytes' arrays. * It has the number of bytes in the beginning, and after that an array. @@ -183,10 +259,19 @@ 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 { +#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; @@ -200,13 +285,170 @@ typedef enum { 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_t pb_extension_type_t; +typedef struct _pb_extension_t pb_extension_t; +struct _pb_extension_type_t { + /* 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_t { + /* 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; +}; + /* 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)) -#define pb_delta_end(st, m1, m2) (offsetof(st, m1) - offsetof(st, m2) - pb_membersize(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)) +/* 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} + +/* 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} + +/* 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_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. */ +#define PB_OPTEXT_STATIC(tag, st, m, fd, ltype, ptr) \ + {tag, PB_ATYPE_STATIC | PB_HTYPE_OPTIONAL | ltype, \ + 0, \ + 0, \ + pb_membersize(st, m), 0, ptr} + +#define PB_OPTEXT_CALLBACK(tag, st, m, fd, ltype, ptr) \ + {tag, PB_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | ltype, \ + 0, 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 +#define PB_LTYPE_MAP_EXTENSION PB_LTYPE_EXTENSION + +/* 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, UINT64 or EXTENSION + * - 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, \ + PB_DATAOFFSET_CHOOSE(message, field, prevfield), \ + PB_LTYPE_MAP_ ## type, ptr) + +/* This is a new version of the macro used by nanopb generator from + * version 0.2.3 onwards. It avoids the use of a ternary expression in + * the initialization, which confused some compilers. + * + * - Placement: FIRST or OTHER, depending on if this is the first field in structure. + * + */ +#define PB_FIELD2(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) + + /* 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.