Fix integer/float/string read: keep value in definition structure

[babeltrace.git] / include / babeltrace / ctf / types.h

diff --git a/include/babeltrace/ctf/types.h b/include/babeltrace/ctf/types.h
index 73288ef6681117bb8b8bd839f5bf5fc3f5f738fd..8c98ff2c76a263155ffb0e77752bcf50fe2b2db6 100644 (file)
--- a/include/babeltrace/ctf/types.h
+++ b/include/babeltrace/ctf/types.h
@@ -21,8 +21,32 @@
 
 #include <babeltrace/types.h>
 #include <stdint.h>
+#include <unistd.h>
 #include <glib.h>
 
+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 stream_pos with move_pos and init_pos.
+ */
+struct stream_pos {
+       int fd;                 /* backing file fd. -1 if unset. */
+       GArray *packet_index;   /* contains struct packet_index */
+
+       /* 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 */
+       char *base;             /* mmap base address */
+       size_t offset;          /* offset from base, in bits */
+
+       int dummy;              /* dummy position, for length calculation */
+};
+
 /*
  * IMPORTANT: All lengths (len) and offsets (start, end) are expressed in bits,
  *            *not* in bytes.
@@ -87,4 +111,57 @@ void ctf_sequence_begin(struct stream_pos *pos,
 void ctf_sequence_end(struct stream_pos *pos,
                const struct declaration_sequence *sequence_declaration);
 
+void move_pos_slow(struct stream_pos *pos, size_t offset);
+
+static inline
+void init_pos(struct stream_pos *pos, int fd)
+{
+       pos->fd = fd;
+       pos->mmap_offset = 0;
+       pos->packet_size = 0;
+       pos->content_size = 0;
+       pos->base = NULL;
+       pos->offset = 0;
+       pos->dummy = false;
+}
+
+/*
+ * move_pos - move position of a relative bit offset
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void move_pos(struct stream_pos *pos, size_t offset)
+{
+       if (pos->fd >= 0 && (pos->offset + offset >= pos->content_size))
+               move_pos_slow(pos, offset);
+       else
+               pos->offset += offset;
+}
+
+/*
+ * align_pos - align position on a bit offset (> 0)
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void align_pos(struct stream_pos *pos, size_t offset)
+{
+       pos->offset += offset_align(pos->offset, offset);
+}
+
+static inline
+void copy_pos(struct stream_pos *dest, struct stream_pos *src)
+{
+       memcpy(dest, src, sizeof(struct stream_pos));
+}
+
+static inline
+char *get_pos_addr(struct stream_pos *pos)
+{
+       /* Only makes sense to get the address after aligning on CHAR_BIT */
+       assert(!(pos->offset % CHAR_BIT));
+       return pos->base + (pos->offset / CHAR_BIT);
+}
+
 #endif /* _BABELTRACE_CTF_TYPES_H */