[babeltrace.git] / plugins / ctf / common / metadata / decoder.h

#ifndef _METADATA_DECODER_H
#define _METADATA_DECODER_H

/*
 * Copyright 2016-2017 - Philippe Proulx <pproulx@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

#include <stdint.h>
#include <stdbool.h>

struct bt_trace;

/* A CTF metadata decoder object */
struct ctf_metadata_decoder;

/* CTF metadata decoder status */
enum ctf_metadata_decoder_status {
	CTF_METADATA_DECODER_STATUS_OK			= 0,
	CTF_METADATA_DECODER_STATUS_ERROR		= -1,
	CTF_METADATA_DECODER_STATUS_INCOMPLETE		= -2,
	CTF_METADATA_DECODER_STATUS_INVAL_VERSION	= -3,
	CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR	= -4,
};

/* Decoding configuration */
struct ctf_metadata_decoder_config {
	int64_t clock_class_offset_s;
	int64_t clock_class_offset_ns;
};

/*
 * Creates a CTF metadata decoder.
 *
 * Returns `NULL` on error.
 */
BT_HIDDEN
struct ctf_metadata_decoder *ctf_metadata_decoder_create(
		const struct ctf_metadata_decoder_config *config);

/*
 * Destroys a CTF metadata decoder that you created with
 * ctf_metadata_decoder_create().
 */
BT_HIDDEN
void ctf_metadata_decoder_destroy(
		struct ctf_metadata_decoder *metadata_decoder);

/*
 * Decodes a new chunk of CTF metadata.
 *
 * This function reads the metadata from the current position of `fp`
 * until the end of this file stream. If it finds new information (new
 * event class, new stream class, or new clock class), it appends this
 * information to the decoder's trace object (as returned by
 * ctf_metadata_decoder_get_ir_trace_class()), or it creates this trace.
 *
 * The metadata can be packetized or not.
 *
 * The metadata chunk needs to be complete and scannable, that is,
 * zero or more complete top-level blocks. If it's incomplete, this
 * function returns `CTF_METADATA_DECODER_STATUS_INCOMPLETE`. If this
 * function returns `CTF_METADATA_DECODER_STATUS_INCOMPLETE`, then you
 * need to call it again with the same metadata and more to make it
 * complete. For example:
 *
 *     First call:  event { name = hell
 *     Second call: event { name = hello_world; ... };
 *
 * If the conversion from the metadata text to CTF IR objects fails,
 * this function returns `CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR`.
 *
 * If everything goes as expected, this function returns
 * `CTF_METADATA_DECODER_STATUS_OK`.
 */
BT_HIDDEN
enum ctf_metadata_decoder_status ctf_metadata_decoder_decode(
		struct ctf_metadata_decoder *metadata_decoder, FILE *fp);

BT_HIDDEN
struct bt_trace_class *ctf_metadata_decoder_get_ir_trace_class(
		struct ctf_metadata_decoder *mdec);

BT_HIDDEN
struct ctf_trace_class *ctf_metadata_decoder_borrow_ctf_trace_class(
		struct ctf_metadata_decoder *mdec);

/*
 * Checks whether or not a given metadata file stream is packetized, and
 * if so, sets `*byte_order` to the byte order of the first packet.
 */
BT_HIDDEN
bool ctf_metadata_decoder_is_packetized(FILE *fp, int *byte_order);

/*
 * Decodes a packetized metadata file stream to a NULL-terminated
 * text buffer using the given byte order.
 */
BT_HIDDEN
int ctf_metadata_decoder_packetized_file_stream_to_buf(
		FILE *fp, char **buf, int byte_order);

#endif /* _METADATA_DECODER_H */
Commit	Line	Data
1e649dff PP	1	#ifndef _METADATA_DECODER_H
	2	#define _METADATA_DECODER_H
	3
	4	/*
	5	* Copyright 2016-2017 - Philippe Proulx <pproulx@efficios.com>
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a copy
	8	* of this software and associated documentation files (the "Software"), to deal
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*/
	17
	18	#include <stdint.h>
a2a54545	19	#include <stdbool.h>
1e649dff	20
50842bdc	21	struct bt_trace;
1e649dff PP	22
	23	/* A CTF metadata decoder object */
	24	struct ctf_metadata_decoder;
	25
	26	/* CTF metadata decoder status */
	27	enum ctf_metadata_decoder_status {
	28	CTF_METADATA_DECODER_STATUS_OK = 0,
	29	CTF_METADATA_DECODER_STATUS_ERROR = -1,
	30	CTF_METADATA_DECODER_STATUS_INCOMPLETE = -2,
	31	CTF_METADATA_DECODER_STATUS_INVAL_VERSION = -3,
	32	CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR = -4,
	33	};
	34
a2a54545 PP	35	/* Decoding configuration */
	36	struct ctf_metadata_decoder_config {
	37	int64_t clock_class_offset_s;
	38	int64_t clock_class_offset_ns;
a2a54545 PP	39	};
a2a54545 PP	40
1e649dff	41	/*
862ca4ed	42	* Creates a CTF metadata decoder.
1e649dff PP	43	*
	44	* Returns `NULL` on error.
	45	*/
	46	BT_HIDDEN
55314f2a	47	struct ctf_metadata_decoder *ctf_metadata_decoder_create(
862ca4ed	48	const struct ctf_metadata_decoder_config *config);
1e649dff PP	49
	50	/*
	51	* Destroys a CTF metadata decoder that you created with
	52	* ctf_metadata_decoder_create().
	53	*/
	54	BT_HIDDEN
	55	void ctf_metadata_decoder_destroy(
	56	struct ctf_metadata_decoder *metadata_decoder);
	57
	58	/*
	59	* Decodes a new chunk of CTF metadata.
	60	*
	61	* This function reads the metadata from the current position of `fp`
	62	* until the end of this file stream. If it finds new information (new
	63	* event class, new stream class, or new clock class), it appends this
	64	* information to the decoder's trace object (as returned by
862ca4ed	65	* ctf_metadata_decoder_get_ir_trace_class()), or it creates this trace.
1e649dff PP	66	*
	67	* The metadata can be packetized or not.
	68	*
	69	* The metadata chunk needs to be complete and scannable, that is,
	70	* zero or more complete top-level blocks. If it's incomplete, this
	71	* function returns `CTF_METADATA_DECODER_STATUS_INCOMPLETE`. If this
	72	* function returns `CTF_METADATA_DECODER_STATUS_INCOMPLETE`, then you
	73	* need to call it again with the same metadata and more to make it
	74	* complete. For example:
	75	*
	76	* First call: event { name = hell
	77	* Second call: event { name = hello_world; ... };
	78	*
	79	* If the conversion from the metadata text to CTF IR objects fails,
	80	* this function returns `CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR`.
	81	*
	82	* If everything goes as expected, this function returns
	83	* `CTF_METADATA_DECODER_STATUS_OK`.
	84	*/
	85	BT_HIDDEN
	86	enum ctf_metadata_decoder_status ctf_metadata_decoder_decode(
	87	struct ctf_metadata_decoder metadata_decoder, FILE fp);
	88
1e649dff	89	BT_HIDDEN
862ca4ed	90	struct bt_trace_class *ctf_metadata_decoder_get_ir_trace_class(
44c440bc PP	91	struct ctf_metadata_decoder *mdec);
	92
	93	BT_HIDDEN
	94	struct ctf_trace_class *ctf_metadata_decoder_borrow_ctf_trace_class(
	95	struct ctf_metadata_decoder *mdec);
1e649dff PP	96
	97	/*
	98	* Checks whether or not a given metadata file stream is packetized, and
	99	* if so, sets `*byte_order` to the byte order of the first packet.
	100	*/
	101	BT_HIDDEN
	102	bool ctf_metadata_decoder_is_packetized(FILE fp, int byte_order);
	103
	104	/*
	105	* Decodes a packetized metadata file stream to a NULL-terminated
	106	* text buffer using the given byte order.
	107	*/
	108	BT_HIDDEN
	109	int ctf_metadata_decoder_packetized_file_stream_to_buf(
	110	FILE fp, char *buf, int byte_order);
	111
	112	#endif /* _METADATA_DECODER_H */