4 /* pb_decode.h: Functions to decode protocol buffers. Depends on pb_decode.c.
5 * The main function is pb_decode. You will also need to create an input
6 * stream, which is easiest to do with pb_istream_from_buffer().
8 * You also need structures and their corresponding pb_field_t descriptions.
9 * These are usually generated from .proto-files with a script.
15 /* Lightweight input stream.
16 * You can provide a callback function for reading or use
17 * pb_istream_from_buffer.
20 * 1) Return false on IO errors. This will cause decoding to abort.
22 * 2) If buf is NULL, read but don't store bytes ("skip input").
24 * 3) You can use state to store your own data (e.g. buffer pointer),
25 * and rely on pb_read to verify that no-body reads past bytes_left.
29 bool (*callback)(pb_istream_t *stream, uint8_t *buf, size_t count);
30 void *state; /* Free field for use by callback implementation */
34 pb_istream_t pb_istream_from_buffer(uint8_t *buf, size_t bufsize);
35 bool pb_read(pb_istream_t *stream, uint8_t *buf, size_t count);
37 /* Decode from stream to destination struct.
38 * Returns true on success, false on any failure.
39 * The actual struct pointed to by dest must match the description in fields.
41 bool pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct);
43 /* --- Helper functions ---
44 * You may want to use these from your caller or callbacks.
47 bool pb_decode_tag(pb_istream_t *stream, pb_wire_type_t *wire_type, uint32_t *tag, bool *eof);
48 bool pb_skip_field(pb_istream_t *stream, pb_wire_type_t wire_type);
50 bool pb_decode_varint(pb_istream_t *stream, uint64_t *dest);
52 bool pb_skip_varint(pb_istream_t *stream);
53 bool pb_skip_string(pb_istream_t *stream);
55 /* --- Field decoders ---
56 * Each decoder takes stream and field description, and a pointer to the field
57 * in the destination struct (dest = struct_addr + field->data_offset).
58 * For arrays, these functions are called repeatedly.
61 bool pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest);
62 bool pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest);
63 bool pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest);
64 bool pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest);
66 bool pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest);
67 bool pb_dec_string(pb_istream_t *stream, const pb_field_t *field, void *dest);
68 bool pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field, void *dest);