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/*
* upb - a minimalist implementation of protocol buffers.
*
* upb_decoder implements a high performance, callback-based, stream-oriented
* decoder (comparable to the SAX model in XML parsers). For parsing protobufs
* into in-memory messages (a more DOM-like model), see the routines in
* upb_msg.h, which are layered on top of this decoder.
*
* TODO: the decoder currently does not support returning unknown values. This
* can easily be added when it is needed.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*/
#ifndef UPB_DECODER_H_
#define UPB_DECODER_H_
#include <stdbool.h>
#include <stdint.h>
#include "upb.h"
#include "descriptor.h"
#ifdef __cplusplus
extern "C" {
#endif
/* upb_decoder *****************************************************************/
// A upb_decoder decodes the binary protocol buffer format, writing the data it
// decodes to a upb_sink.
struct upb_decoder;
typedef struct upb_decoder upb_decoder;
// Allocates and frees a upb_decoder, respectively.
upb_decoder *upb_decoder_new(upb_msgdef *md);
void upb_decoder_free(upb_decoder *p);
// Resets the internal state of an already-allocated decoder. This puts it in a
// state where it has not seen any data, and expects the next data to be from
// the beginning of a new protobuf. Parsers must be reset before they can be
// used. A decoder can be reset multiple times.
void upb_decoder_reset(upb_decoder *p, upb_sink *sink);
// Decodes protobuf data out of str, returning how much data was decoded. The
// next call to upb_decoder_decode should begin with the first byte that was
// not decoded. "status" indicates whether an error occurred.
//
// TODO: provide the following guarantee:
// retval will always be >= len.
size_t upb_decoder_decode(upb_decoder *p, upb_strptr str, upb_status *status);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UPB_DECODER_H_ */
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