-bool pb_write(pb_ostream_t *stream, const uint8_t *buf, size_t count);
-
-/* Structure for defining custom output streams. You will need to provide
- * a callback function to write the bytes to your storage, which can be
- * for example a file or a network socket.
- *
- * The callback must conform to these rules:
- *
- * 1) Return false on IO errors. This will cause encoding to abort.
- * 2) You can use state to store your own data (e.g. buffer pointer).
- * 3) pb_write will update bytes_written after your callback runs.
- * 4) Substreams will modify max_size and bytes_written. Don't use them
- * to calculate any pointers.
- */
-struct _pb_ostream_t
-{
-#ifdef PB_BUFFER_ONLY
- /* Callback pointer is not used in buffer-only configuration.
- * Having an int pointer here allows binary compatibility but
- * gives an error if someone tries to assign callback function.
- * Also, NULL pointer marks a 'sizing stream' that does not
- * write anything.
- */
- int *callback;
-#else
- bool (*callback)(pb_ostream_t *stream, const uint8_t *buf, size_t count);
-#endif
- void *state; /* Free field for use by callback implementation. */
- size_t max_size; /* Limit number of output bytes written (or use SIZE_MAX). */
- size_t bytes_written; /* Number of bytes written so far. */
-
-#ifndef PB_NO_ERRMSG
- const char *errmsg;
-#endif
-};