[sysprof] libsysprof-capture: add helper to list files in capture

[Christian Hergert <chergert src gnome org>]

commit 336dae4d1f3e17cc70d64d67f4d6cccfe39d6add
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 27 15:43:00 2019 -0700

    libsysprof-capture: add helper to list files in capture

 src/libsysprof-capture/sysprof-capture-reader.c | 36 +++++++++++++++++++++++++
 src/libsysprof-capture/sysprof-capture-reader.h |  2 ++
 src/tests/test-capture.c                        |  7 +++++
 3 files changed, 45 insertions(+)
---
diff --git a/src/libsysprof-capture/sysprof-capture-reader.c b/src/libsysprof-capture/sysprof-capture-reader.c
index 640bfd4..b65fe67 100644
--- a/src/libsysprof-capture/sysprof-capture-reader.c
+++ b/src/libsysprof-capture/sysprof-capture-reader.c
@@ -1173,3 +1173,39 @@ sysprof_capture_reader_read_file (SysprofCaptureReader *self)
 
   return file_chunk;
 }
+
+gchar **
+sysprof_capture_reader_list_files (SysprofCaptureReader *self)
+{
+  g_autoptr(GHashTable) files = NULL;
+  g_autoptr(GPtrArray) ar = NULL;
+  SysprofCaptureFrameType type;
+  GHashTableIter iter;
+  const gchar *key;
+
+  g_assert (self != NULL);
+
+  ar = g_ptr_array_new_with_free_func (g_free);
+  files = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
+
+  while (sysprof_capture_reader_peek_type (self, &type))
+    {
+      const SysprofCaptureFileChunk *file;
+
+      if (type != SYSPROF_CAPTURE_FRAME_FILE_CHUNK)
+        continue;
+
+      if (!(file = sysprof_capture_reader_read_file (self)))
+        break;
+
+      if (!g_hash_table_contains (files, file->path))
+        g_hash_table_insert (files, g_strdup (file->path), NULL);
+    }
+
+  g_hash_table_iter_init (&iter, files);
+  while (g_hash_table_iter_next (&iter, (gpointer *)&key, NULL))
+    g_ptr_array_add (ar, g_strdup (key));
+  g_ptr_array_add (ar, NULL);
+
+  return (gchar **)g_ptr_array_free (g_steal_pointer (&ar), FALSE);
+}
diff --git a/src/libsysprof-capture/sysprof-capture-reader.h b/src/libsysprof-capture/sysprof-capture-reader.h
index f14128e..3256003 100644
--- a/src/libsysprof-capture/sysprof-capture-reader.h
+++ b/src/libsysprof-capture/sysprof-capture-reader.h
@@ -97,6 +97,8 @@ gboolean                                sysprof_capture_reader_get_stat
 SYSPROF_AVAILABLE_IN_ALL
 void                                    sysprof_capture_reader_set_stat            (SysprofCaptureReader     
*self,
                                                                                     const SysprofCaptureStat 
*st_buf);
+SYSPROF_AVAILABLE_IN_ALL
+gchar                                 **sysprof_capture_reader_list_files          (SysprofCaptureReader     
*self);
 
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofCaptureReader, sysprof_capture_reader_unref)
 
diff --git a/src/tests/test-capture.c b/src/tests/test-capture.c
index 3f60325..8c2b2a5 100644
--- a/src/tests/test-capture.c
+++ b/src/tests/test-capture.c
@@ -716,6 +716,7 @@ test_reader_writer_file (void)
 {
   g_autofree gchar *data = NULL;
   GByteArray *buf = g_byte_array_new ();
+  g_auto(GStrv) files = NULL;
   SysprofCaptureWriter *writer;
   SysprofCaptureReader *reader;
   SysprofCaptureFrameType type;
@@ -772,6 +773,12 @@ test_reader_writer_file (void)
   r = sysprof_capture_reader_peek_type (reader, &type);
   g_assert_cmpint (r, ==, FALSE);
 
+  sysprof_capture_reader_reset (reader);
+  files = sysprof_capture_reader_list_files (reader);
+  g_assert_nonnull (files);
+  g_assert_cmpstr (files[0], ==, "/proc/kallsyms");
+  g_assert_null (files[1]);
+
   g_clear_pointer (&reader, sysprof_capture_reader_unref);
   g_clear_pointer (&buf, g_byte_array_unref);