diff options
Diffstat (limited to 'pb.h')
| -rw-r--r-- | pb.h | 77 |
1 files changed, 76 insertions, 1 deletions
@@ -204,9 +204,84 @@ typedef enum { #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_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_ARRAY | 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. |