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/*
* pbstream - a stream-oriented implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*
* pbstruct is an efficient, compact, self-describing format for storing
* pb messages in-memory. It can be used when parsing a protobuf into
* a structure is desired, but both the parsing and emitting modules can
* be used without ever using pbstruct.
*/
#include <stdbool.h>
#include <stdint.h>
typedef enum pbstruct_type {
PBSTRUCT_TYPE_DOUBLE = 1,
PBSTRUCT_TYPE_FLOAT = 2,
PBSTRUCT_TYPE_INT32 = 3,
PBSTRUCT_TYPE_UINT32 = 4,
PBSTRUCT_TYPE_INT64 = 5,
PBSTRUCT_TYPE_UINT64 = 6,
PBSTRUCT_TYPE_BOOL = 7,
/* For these types, the main struct contains a pointer to the real data. */
PBSTRUCT_TYPE_BYTES = 8,
PBSTRUCT_TYPE_STRING = 9,
PBSTRUCT_TYPE_SUBSTRUCT = 10,
/* The array types are just like the primitive types, except the main struct
* contains a pointer to an array of the primitive type. */
PBSTRUCT_ARRAY = 16, /* Not itself a real type. */
PBSTRUCT_TYPE_DOUBLE_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_DOUBLE,
PBSTRUCT_TYPE_FLOAT_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_FLOAT,
PBSTRUCT_TYPE_INT32_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_INT32,
PBSTRUCT_TYPE_UINT32_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_UINT32,
PBSTRUCT_TYPE_INT64_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_INT64,
PBSTRUCT_TYPE_UINT64_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_UINT64,
PBSTRUCT_TYPE_BOOL_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_BOOL,
PBSTRUCT_TYPE_BYTES_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_BYTES,
PBSTRUCT_TYPE_STRING_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_STRING,
PBSTRUCT_TYPE_SUBSTRUCT_ARRAY = PBSTRUCT_ARRAY | PBSTRUCT_TYPE_SUBSTRUCT,
} pbstruct_type_t;
struct pbstruct_field {
char *name;
pbstruct_type_t type;
ptrdiff_t byte_offset;
ptrdiff_t isset_byte_offset;
uint8_t isset_byte_mask;
};
struct pbstruct_delimited {
size_t len;
char data[];
};
struct pbstruct_definition {
char *name;
size_t struct_size;
int num_fields;
int num_required_fields;
struct pbstruct_field fields[];
};
struct pbstruct {
struct pbstruct_definition *definition;
uint8_t data[];
};
struct pbstruct* pbstruct_new(struct pbstruct_definition *definition);
/* Deletes any sub-structs also. */
struct pbstruct* pbstruct_delete(struct pbstruct_definition *definition);
inline bool pbstruct_is_set(struct pbstruct *s, struct pbstruct_field *f) {
return s->data[f->isset_byte_offset] & f->isset_byte_mask;
}
/* These do no existence checks or type checks. */
#define DEFINE_GETTERS(ctype, name) \
inline ctype pbstruct_get_ ## name(struct pbstruct *s, struct pbstruct_field *f) { \
/* TODO: make sure the compiler knows this is an aligned access. */ \
return *(ctype*)(s->data + f->byte_offset); \
} \
inline ctype *pbstruct_get_ ## name ## _array(struct pbstruct *s, \
struct pbstruct_field *f) { \
/* TODO: make sure the compiler knows this is an aligned access. */ \
return *(ctype**)(s->data + f->byte_offset); \
}
DEFINE_GETTERS(double, double)
DEFINE_GETTERS(float, float)
DEFINE_GETTERS(int32_t, int32)
DEFINE_GETTERS(int64_t, int64)
DEFINE_GETTERS(uint32_t, uint32)
DEFINE_GETTERS(uint64_t, uint64)
DEFINE_GETTERS(bool, bool)
DEFINE_GETTERS(struct pbstruct_delimited*, bytes)
DEFINE_GETTERS(struct pbstruct_delimited*, string)
DEFINE_GETTERS(struct pbstruct*, substruct)
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