[sysprof] capture: add sp_capture_reader_peek_frame()

[Christian Hergert <chergert src gnome org>]

commit 253b3873238af1de722e0c001dd2719fe99f0386
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 15 04:48:46 2016 -0700

    capture: add sp_capture_reader_peek_frame()
    
    It can be useful to peek at the whole frame header (for things like time
    or pid or cpu).

 lib/sp-capture-reader.c |   34 +++++++++++++++++++++++++---------
 lib/sp-capture-reader.h |    2 ++
 2 files changed, 27 insertions(+), 9 deletions(-)
---
diff --git a/lib/sp-capture-reader.c b/lib/sp-capture-reader.c
index c283928..70ce4bc 100644
--- a/lib/sp-capture-reader.c
+++ b/lib/sp-capture-reader.c
@@ -277,26 +277,42 @@ sp_capture_reader_skip (SpCaptureReader *self)
 }
 
 gboolean
-sp_capture_reader_peek_type (SpCaptureReader    *self,
-                             SpCaptureFrameType *type)
+sp_capture_reader_peek_frame (SpCaptureReader *self,
+                              SpCaptureFrame  *frame)
 {
-  SpCaptureFrame *frame;
+  SpCaptureFrame *real_frame;
 
   g_assert (self != NULL);
   g_assert ((self->pos % SP_CAPTURE_ALIGN) == 0);
   g_assert (self->pos <= self->bufsz);
-  g_assert (type != NULL);
-
-  *type = 0;
 
-  if (!sp_capture_reader_ensure_space_for (self, sizeof *frame))
+  if (!sp_capture_reader_ensure_space_for (self, sizeof *real_frame))
     return FALSE;
 
   g_assert ((self->pos % SP_CAPTURE_ALIGN) == 0);
 
-  frame = (SpCaptureFrame *)(gpointer)&self->buf[self->pos];
+  real_frame = (SpCaptureFrame *)(gpointer)&self->buf[self->pos];
+
+  *frame = *real_frame;
+
+  sp_capture_reader_bswap_frame (self, frame);
+
+  return TRUE;
+}
+
+gboolean
+sp_capture_reader_peek_type (SpCaptureReader    *self,
+                             SpCaptureFrameType *type)
+{
+  SpCaptureFrame frame;
+
+  g_assert (self != NULL);
+  g_assert (type != NULL);
+
+  if (!sp_capture_reader_peek_frame (self, &frame))
+    return FALSE;
 
-  *type = frame->type;
+  *type = frame.type;
 
   return TRUE;
 }
diff --git a/lib/sp-capture-reader.h b/lib/sp-capture-reader.h
index bfe6217..f8160f3 100644
--- a/lib/sp-capture-reader.h
+++ b/lib/sp-capture-reader.h
@@ -37,6 +37,8 @@ gint64                             sp_capture_reader_get_start_time      (SpCapt
 gboolean                           sp_capture_reader_skip                (SpCaptureReader     *self);
 gboolean                           sp_capture_reader_peek_type           (SpCaptureReader     *self,
                                                                           SpCaptureFrameType  *type);
+gboolean                           sp_capture_reader_peek_frame          (SpCaptureReader     *self,
+                                                                          SpCaptureFrame      *frame);
 const SpCaptureMap                *sp_capture_reader_read_map            (SpCaptureReader     *self);
 const SpCaptureExit               *sp_capture_reader_read_exit           (SpCaptureReader     *self);
 const SpCaptureFork               *sp_capture_reader_read_fork           (SpCaptureReader     *self);