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-rw-r--r--src/input_stream.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/input_stream.c b/src/input_stream.c
index b25f3bf40..4375db948 100644
--- a/src/input_stream.c
+++ b/src/input_stream.c
@@ -86,6 +86,7 @@ input_stream_open(struct input_stream *is, const char *url)
assert(is->plugin->close != NULL);
assert(is->plugin->read != NULL);
assert(is->plugin->eof != NULL);
+ assert(!is->seekable || is->plugin->seek != NULL);
return true;
}
@@ -97,6 +98,9 @@ input_stream_open(struct input_stream *is, const char *url)
bool
input_stream_seek(struct input_stream *is, off_t offset, int whence)
{
+ if (is->plugin->seek == NULL)
+ return false;
+
return is->plugin->seek(is, offset, whence);
}
@@ -133,5 +137,8 @@ bool input_stream_eof(struct input_stream *is)
int input_stream_buffer(struct input_stream *is)
{
+ if (is->plugin->buffer == NULL)
+ return 0;
+
return is->plugin->buffer(is);
}