protobuf.h

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#ifndef __CWIST_PROTOBUF_H__
#define __CWIST_PROTOBUF_H__
 
#include <stddef.h>
#include <stdint.h>
#include <string.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef enum cwist_pb_wire_type {
    CWIST_PB_VARINT = 0,
    CWIST_PB_64BIT = 1,
    CWIST_PB_LEN = 2,
    CWIST_PB_32BIT = 5,
} cwist_pb_wire_type_t;
 
#define CWIST_PB_MAX_FIELD_NUMBER 536870911u
 
typedef struct cwist_pb_writer {
    uint8_t *data;
    size_t len;
    size_t cap;
} cwist_pb_writer;
 
typedef struct cwist_pb_reader {
    const uint8_t *data;
    size_t len;
    size_t pos;
} cwist_pb_reader;
 
typedef struct cwist_pb_field {
    uint32_t number;
    cwist_pb_wire_type_t wire_type;
    uint64_t varint;
    const uint8_t *bytes;
    size_t len;
} cwist_pb_field;
 
void cwist_pb_writer_init(cwist_pb_writer *w);
void cwist_pb_writer_free(cwist_pb_writer *w);
int cwist_pb_writer_reserve(cwist_pb_writer *w, size_t extra);
int cwist_pb_write_varint(cwist_pb_writer *w, uint64_t value);
int cwist_pb_write_key(cwist_pb_writer *w, uint32_t field_number, cwist_pb_wire_type_t wire_type);
int cwist_pb_write_uint64_field(cwist_pb_writer *w, uint32_t field_number, uint64_t value);
int cwist_pb_write_int64_field(cwist_pb_writer *w, uint32_t field_number, int64_t value);
int cwist_pb_write_bool_field(cwist_pb_writer *w, uint32_t field_number, int value);
int cwist_pb_write_raw32(cwist_pb_writer *w, uint32_t value);
int cwist_pb_write_raw64(cwist_pb_writer *w, uint64_t value);
int cwist_pb_write_fixed32_field(cwist_pb_writer *w, uint32_t field_number, uint32_t value);
int cwist_pb_write_fixed64_field(cwist_pb_writer *w, uint32_t field_number, uint64_t value);
int cwist_pb_write_float_field(cwist_pb_writer *w, uint32_t field_number, float value);
int cwist_pb_write_double_field(cwist_pb_writer *w, uint32_t field_number, double value);
int cwist_pb_write_bytes_field(cwist_pb_writer *w, uint32_t field_number, const void *data,
                               size_t len);
int cwist_pb_write_string_field(cwist_pb_writer *w, uint32_t field_number, const char *value);
 
static inline uint32_t cwist_pb_load32_le(const uint8_t *p) {
    return (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((uint32_t)p[3] << 24);
}
 
static inline uint64_t cwist_pb_load64_le(const uint8_t *p) {
    return (uint64_t)cwist_pb_load32_le(p) | ((uint64_t)cwist_pb_load32_le(p + 4) << 32);
}
 
static inline uint32_t cwist_pb_float_bits(float value) {
    uint32_t bits;
    memcpy(&bits, &value, sizeof(bits));
    return bits;
}
 
static inline uint64_t cwist_pb_double_bits(double value) {
    uint64_t bits;
    memcpy(&bits, &value, sizeof(bits));
    return bits;
}
 
static inline float cwist_pb_load_float(const uint8_t *p) {
    uint32_t bits = cwist_pb_load32_le(p);
    float value;
    memcpy(&value, &bits, sizeof(value));
    return value;
}
 
static inline double cwist_pb_load_double(const uint8_t *p) {
    uint64_t bits = cwist_pb_load64_le(p);
    double value;
    memcpy(&value, &bits, sizeof(value));
    return value;
}
 
void cwist_pb_reader_init(cwist_pb_reader *r, const void *data, size_t len);
int cwist_pb_read_varint(cwist_pb_reader *r, uint64_t *out);
int cwist_pb_read_field(cwist_pb_reader *r, cwist_pb_field *field);
int cwist_pb_skip_field(cwist_pb_reader *r, const cwist_pb_field *field);
 
uint64_t cwist_pb_zigzag_encode(int64_t value);
int64_t cwist_pb_zigzag_decode(uint64_t value);
 
#ifdef __cplusplus
}
#endif
 
#endif