| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright 2016-2017 Philippe Proulx <pproulx@efficios.com> |
| 5 | */ |
| 6 | |
| 7 | #ifndef _METADATA_DECODER_H |
| 8 | #define _METADATA_DECODER_H |
| 9 | |
| 10 | #include <stdint.h> |
| 11 | #include <stdbool.h> |
| 12 | #include <stdio.h> |
| 13 | |
| 14 | #include <babeltrace2/babeltrace.h> |
| 15 | |
| 16 | #include "common/macros.h" |
| 17 | #include "common/uuid.h" |
| 18 | |
| 19 | struct ctf_trace_class; |
| 20 | |
| 21 | /* A CTF metadata decoder object */ |
| 22 | struct ctf_metadata_decoder; |
| 23 | |
| 24 | /* CTF metadata decoder status */ |
| 25 | enum ctf_metadata_decoder_status |
| 26 | { |
| 27 | CTF_METADATA_DECODER_STATUS_OK = 0, |
| 28 | CTF_METADATA_DECODER_STATUS_NONE = 1, |
| 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 | |
| 35 | /* Decoding configuration */ |
| 36 | struct ctf_metadata_decoder_config |
| 37 | { |
| 38 | /* Active log level to use */ |
| 39 | bt_logging_level log_level; |
| 40 | |
| 41 | /* |
| 42 | * Component or component class to use for logging (exactly one of |
| 43 | * them must be non-`NULL`); weak |
| 44 | */ |
| 45 | bt_self_component *self_comp; |
| 46 | bt_self_component_class *self_comp_class; |
| 47 | |
| 48 | /* Additional clock class offset to apply */ |
| 49 | int64_t clock_class_offset_s; |
| 50 | int64_t clock_class_offset_ns; |
| 51 | bool force_clock_class_origin_unix_epoch; |
| 52 | |
| 53 | /* True to create trace class objects */ |
| 54 | bool create_trace_class; |
| 55 | |
| 56 | /* |
| 57 | * True to keep the plain text when content is appended with |
| 58 | * ctf_metadata_decoder_append_content(). |
| 59 | */ |
| 60 | bool keep_plain_text; |
| 61 | }; |
| 62 | |
| 63 | /* |
| 64 | * Creates a CTF metadata decoder. |
| 65 | * |
| 66 | * Returns `NULL` on error. |
| 67 | */ |
| 68 | BT_HIDDEN |
| 69 | struct ctf_metadata_decoder * |
| 70 | ctf_metadata_decoder_create(const struct ctf_metadata_decoder_config *config); |
| 71 | |
| 72 | /* |
| 73 | * Destroys a CTF metadata decoder that you created with |
| 74 | * ctf_metadata_decoder_create(). |
| 75 | */ |
| 76 | BT_HIDDEN |
| 77 | void ctf_metadata_decoder_destroy(struct ctf_metadata_decoder *metadata_decoder); |
| 78 | |
| 79 | /* |
| 80 | * Appends content to the metadata decoder. |
| 81 | * |
| 82 | * This function reads the metadata from the current position of `fp` |
| 83 | * until the end of this file stream. |
| 84 | * |
| 85 | * The metadata can be packetized or not. |
| 86 | * |
| 87 | * The metadata chunk needs to be complete and lexically scannable, that |
| 88 | * is, zero or more complete top-level blocks. If it's incomplete, this |
| 89 | * function returns `CTF_METADATA_DECODER_STATUS_INCOMPLETE`. If this |
| 90 | * function returns `CTF_METADATA_DECODER_STATUS_INCOMPLETE`, then you |
| 91 | * need to call it again with the _same_ metadata and more to make it |
| 92 | * complete. For example: |
| 93 | * |
| 94 | * First call: event { name = hell |
| 95 | * Second call: event { name = hello_world; ... }; |
| 96 | * |
| 97 | * If everything goes as expected, this function returns |
| 98 | * `CTF_METADATA_DECODER_STATUS_OK`. |
| 99 | */ |
| 100 | BT_HIDDEN |
| 101 | enum ctf_metadata_decoder_status |
| 102 | ctf_metadata_decoder_append_content(struct ctf_metadata_decoder *metadata_decoder, FILE *fp); |
| 103 | |
| 104 | /* |
| 105 | * Returns the trace IR trace class of this metadata decoder (new |
| 106 | * reference). |
| 107 | * |
| 108 | * Returns `NULL` if there's none yet or if the metadata decoder is not |
| 109 | * configured to create trace classes. |
| 110 | */ |
| 111 | BT_HIDDEN |
| 112 | bt_trace_class *ctf_metadata_decoder_get_ir_trace_class(struct ctf_metadata_decoder *mdec); |
| 113 | |
| 114 | /* |
| 115 | * Returns the CTF IR trace class of this metadata decoder. |
| 116 | * |
| 117 | * Returns `NULL` if there's none yet or if the metadata decoder is not |
| 118 | * configured to create trace classes. |
| 119 | */ |
| 120 | BT_HIDDEN |
| 121 | struct ctf_trace_class * |
| 122 | ctf_metadata_decoder_borrow_ctf_trace_class(struct ctf_metadata_decoder *mdec); |
| 123 | |
| 124 | /* |
| 125 | * Checks whether or not a given metadata file stream `fp` is |
| 126 | * packetized, setting `is_packetized` accordingly on success. On |
| 127 | * success, also sets `*byte_order` to the byte order of the first |
| 128 | * packet. |
| 129 | * |
| 130 | * This function uses `log_level` and `self_comp` for logging purposes. |
| 131 | * `self_comp` can be `NULL` if not available. |
| 132 | */ |
| 133 | BT_HIDDEN |
| 134 | int ctf_metadata_decoder_is_packetized(FILE *fp, bool *is_packetized, int *byte_order, |
| 135 | bt_logging_level log_level, bt_self_component *self_comp); |
| 136 | |
| 137 | /* |
| 138 | * Returns the byte order of the decoder's metadata stream as set by the |
| 139 | * last call to ctf_metadata_decoder_append_content(). |
| 140 | * |
| 141 | * Returns -1 if unknown (plain text content). |
| 142 | */ |
| 143 | BT_HIDDEN |
| 144 | int ctf_metadata_decoder_get_byte_order(struct ctf_metadata_decoder *mdec); |
| 145 | |
| 146 | /* |
| 147 | * Returns the UUID of the decoder's metadata stream as set by the last |
| 148 | * call to ctf_metadata_decoder_append_content(). |
| 149 | */ |
| 150 | BT_HIDDEN |
| 151 | int ctf_metadata_decoder_get_uuid(struct ctf_metadata_decoder *mdec, bt_uuid_t uuid); |
| 152 | |
| 153 | /* |
| 154 | * Returns the UUID of the decoder's trace class, if available. |
| 155 | * |
| 156 | * Returns: |
| 157 | * |
| 158 | * * `CTF_METADATA_DECODER_STATUS_OK`: success. |
| 159 | * * `CTF_METADATA_DECODER_STATUS_NONE`: no UUID. |
| 160 | * * `CTF_METADATA_DECODER_STATUS_INCOMPLETE`: missing metadata content. |
| 161 | */ |
| 162 | BT_HIDDEN |
| 163 | enum ctf_metadata_decoder_status |
| 164 | ctf_metadata_decoder_get_trace_class_uuid(struct ctf_metadata_decoder *mdec, bt_uuid_t uuid); |
| 165 | |
| 166 | /* |
| 167 | * Returns the metadata decoder's current metadata text. |
| 168 | */ |
| 169 | BT_HIDDEN |
| 170 | const char *ctf_metadata_decoder_get_text(struct ctf_metadata_decoder *mdec); |
| 171 | |
| 172 | static inline bool ctf_metadata_decoder_is_packet_version_valid(unsigned int major, |
| 173 | unsigned int minor) |
| 174 | { |
| 175 | return major == 1 && minor == 8; |
| 176 | } |
| 177 | |
| 178 | #endif /* _METADATA_DECODER_H */ |