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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*/
#ifndef UPB_H_
#define UPB_H_
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h> /* for size_t. */
#ifdef __cplusplus
extern "C" {
#endif
/* Portable inlining strategy: use C99 rules except on GCC.
* see: http://www.greenend.org.uk/rjk/2003/03/inline.html. */
#ifndef INLINE
# if __GNUC__ && !__GNUC_STDC_INLINE__
# define INLINE extern inline
# else
# define INLINE inline
# endif
#endif
/* The maximum that any submessages can be nested. Matches proto2's limit. */
#define UPB_MAX_NESTING 64
/* A list of types as they are encoded on-the-wire. */
enum upb_wire_type {
UPB_WIRE_TYPE_VARINT = 0,
UPB_WIRE_TYPE_64BIT = 1,
UPB_WIRE_TYPE_DELIMITED = 2,
UPB_WIRE_TYPE_START_GROUP = 3,
UPB_WIRE_TYPE_END_GROUP = 4,
UPB_WIRE_TYPE_32BIT = 5
};
typedef uint8_t upb_wire_type_t;
/* A value as it is encoded on-the-wire, except delimited, which is handled
* separately. */
union upb_wire_value {
uint64_t varint;
uint64_t _64bit;
uint32_t _32bit;
};
/* Value type as defined in a .proto file. The values of this are defined by
* google_protobuf_FieldDescriptorProto_Type (from descriptor.proto).
* Note that descriptor.proto reserves "0" for errors, and we use it to
* represent exceptional circumstances. */
typedef uint8_t upb_field_type_t;
/* A value as described in a .proto file, except delimited, which is handled
* separately. */
union upb_value {
double _double;
float _float;
int32_t int32;
int64_t int64;
uint32_t uint32;
uint64_t uint64;
bool _bool;
uint32_t delim_len;
};
/* The number of a field, eg. "optional string foo = 3". */
typedef int32_t upb_field_number_t;
/* A tag occurs before each value on-the-wire. */
struct upb_tag {
upb_field_number_t field_number;
upb_wire_type_t wire_type;
};
/* Status codes used as a return value. */
typedef enum upb_status {
UPB_STATUS_OK = 0,
// A varint did not terminate before hitting 64 bits.
UPB_ERROR_UNTERMINATED_VARINT = -1,
// A submessage or packed array ended in the middle of data.
UPB_ERROR_BAD_SUBMESSAGE_END = -2,
// Input was nested more than UPB_MAX_NESTING deep.
UPB_ERROR_STACK_OVERFLOW = -3,
// The input data caused the pb's offset (a size_t) to overflow.
UPB_ERROR_OVERFLOW = -4,
// An "end group" tag was encountered in an inappropriate place.
UPB_ERROR_SPURIOUS_END_GROUP = -5
} upb_status_t;
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UPB_H_ */
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