+struct packet_index {
+ off_t offset; /* offset of the packet in the file, in bytes */
+ size_t packet_size; /* packet size, in bits */
+ size_t content_size; /* content size, in bits */
+};
+
+/*
+ * Always update ctf_stream_pos with ctf_move_pos and ctf_init_pos.
+ */
+struct ctf_stream_pos {
+ struct stream_pos parent;
+ int fd; /* backing file fd. -1 if unset. */
+ GArray *packet_index; /* contains struct packet_index */
+ int prot; /* mmap protection */
+ int flags; /* mmap flags */
+
+ /* Current position */
+ off_t mmap_offset; /* mmap offset in the file, in bytes */
+ size_t packet_size; /* current packet size, in bits */
+ size_t content_size; /* current content size, in bits */
+ uint32_t *content_size_loc; /* pointer to current content size */
+ char *base; /* mmap base address */
+ size_t offset; /* offset from base, in bits */
+ size_t cur_index; /* current index in packet index */
+
+ int dummy; /* dummy position, for length calculation */
+};
+
+static inline
+struct ctf_stream_pos *ctf_pos(struct stream_pos *pos)
+{
+ return container_of(pos, struct ctf_stream_pos, parent);
+}
+
+void ctf_integer_read(struct stream_pos *pos, struct definition *definition);
+void ctf_integer_write(struct stream_pos *pos, struct definition *definition);
+void ctf_float_read(struct stream_pos *pos, struct definition *definition);
+void ctf_float_write(struct stream_pos *pos, struct definition *definition);
+void ctf_string_read(struct stream_pos *pos, struct definition *definition);
+void ctf_string_write(struct stream_pos *pos, struct definition *definition);
+void ctf_enum_read(struct stream_pos *pos, struct definition *definition);
+void ctf_enum_write(struct stream_pos *pos, struct definition *definition);
+void ctf_struct_rw(struct stream_pos *pos, struct definition *definition);
+void ctf_variant_rw(struct stream_pos *pos, struct definition *definition);
+void ctf_array_rw(struct stream_pos *pos, struct definition *definition);
+void ctf_sequence_rw(struct stream_pos *pos, struct definition *definition);
+
+void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset);
+
+void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags);
+void ctf_fini_pos(struct ctf_stream_pos *pos);
+
+/*
+ * move_pos - move position of a relative bit offset
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void ctf_move_pos(struct ctf_stream_pos *pos, size_t bit_offset)
+{
+ if (pos->fd >= 0) {
+ if (((pos->prot == PROT_READ)
+ && (pos->offset + bit_offset >= pos->content_size))
+ || ((pos->prot == PROT_WRITE)
+ && (pos->offset + bit_offset >= pos->packet_size))) {
+ ctf_move_pos_slow(pos, bit_offset);
+ return;
+ }
+ }
+ pos->offset += bit_offset;
+}
+