Add single-stream tests

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

diff --git a/include/babeltrace/ctf/types.h b/include/babeltrace/ctf/types.h
index c311b532738612fb2feeb31da1655755f610101a..8f9bf992e9d49e18360e09f976d72a4636585f85 100644 (file)
--- a/include/babeltrace/ctf/types.h
+++ b/include/babeltrace/ctf/types.h
@@ -20,61 +20,38 @@
  */
 
 #include <babeltrace/types.h>
+#include <sys/mman.h>
+#include <errno.h>
 #include <stdint.h>
+#include <unistd.h>
 #include <glib.h>
 
-/*
- * Always update stream_pos with move_pos and init_pos.
- */
-struct stream_pos {
-       char *base;             /* Base address */
-       size_t offset;          /* Offset from base, in bits */
-       int dummy;              /* Dummy position, for length calculation */
+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 */
 };
 
-static inline
-void init_pos(struct stream_pos *pos, char *base)
-{
-       pos->base = base;       /* initial base, page-aligned */
-       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)
-{
-       pos->offset = pos->offset + offset;
-}
-
 /*
- * align_pos - align position on a bit offset (> 0)
- *
- * TODO: allow larger files by updating base too.
+ * Always update stream_pos with move_pos and init_pos.
  */
-static inline
-void align_pos(struct stream_pos *pos, size_t offset)
-{
-       pos->offset += offset_align(pos->offset, offset);
-}
+struct stream_pos {
+       int fd;                 /* backing file fd. -1 if unset. */
+       GArray *packet_index;   /* contains struct packet_index */
+       int prot;               /* mmap protection */
+       int flags;              /* mmap flags */
 
-static inline
-void copy_pos(struct stream_pos *dest, struct stream_pos *src)
-{
-       memcpy(dest, src, sizeof(struct stream_pos));
-}
+       /* 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 */
 
-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);
-}
+       int dummy;              /* dummy position, for length calculation */
+};
 
 /*
  * IMPORTANT: All lengths (len) and offsets (start, end) are expressed in bits,
@@ -140,4 +117,74 @@ 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);
+
+void init_pos(struct stream_pos *pos, int fd);
+void fini_pos(struct stream_pos *pos);
+
+/*
+ * 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 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))) {
+                       move_pos_slow(pos, bit_offset);
+                       return;
+               }
+       }
+       pos->offset += bit_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 bit_offset)
+{
+       move_pos(pos, offset_align(pos->offset, bit_offset));
+}
+
+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);
+}
+
+static inline
+void dummy_pos(struct stream_pos *pos, struct stream_pos *dummy)
+{
+       memcpy(dummy, pos, sizeof(struct stream_pos));
+       dummy->dummy = 1;
+       dummy->fd = -1;
+}
+
+/*
+ * Check if current packet can hold data.
+ * Returns 0 for success, negative error otherwise.
+ */
+static inline
+int pos_packet(struct stream_pos *dummy)
+{
+       if (dummy->offset > dummy->packet_size)
+               return -ENOSPC;
+       return 0;
+}
+
+static inline
+void pos_pad_packet(struct stream_pos *pos)
+{
+       move_pos(pos, pos->packet_size - pos->offset);
+}
+
 #endif /* _BABELTRACE_CTF_TYPES_H */