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-rw-r--r--src/decoder/plugins/OggFind.cxx70
1 files changed, 70 insertions, 0 deletions
diff --git a/src/decoder/plugins/OggFind.cxx b/src/decoder/plugins/OggFind.cxx
new file mode 100644
index 000000000..978e1d7cf
--- /dev/null
+++ b/src/decoder/plugins/OggFind.cxx
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "OggFind.hxx"
+#include "OggSyncState.hxx"
+#include "input/InputStream.hxx"
+#include "util/Error.hxx"
+
+bool
+OggFindEOS(OggSyncState &oy, ogg_stream_state &os, ogg_packet &packet)
+{
+ while (true) {
+ int r = ogg_stream_packetout(&os, &packet);
+ if (r == 0) {
+ if (!oy.ExpectPageIn(os))
+ return false;
+
+ continue;
+ } else if (r > 0 && packet.e_o_s)
+ return true;
+ }
+}
+
+bool
+OggSeekPageAtOffset(OggSyncState &oy, ogg_stream_state &os, InputStream &is,
+ offset_type offset)
+{
+ oy.Reset();
+
+ /* reset the stream to clear any previous partial packet
+ data */
+ ogg_stream_reset(&os);
+
+ return is.LockSeek(offset, IgnoreError()) &&
+ oy.ExpectPageSeekIn(os);
+}
+
+bool
+OggSeekFindEOS(OggSyncState &oy, ogg_stream_state &os, ogg_packet &packet,
+ InputStream &is)
+{
+ if (!is.KnownSize())
+ return false;
+
+ if (is.GetRest() < 65536)
+ return OggFindEOS(oy, os, packet);
+
+ if (!is.CheapSeeking())
+ return false;
+
+ return OggSeekPageAtOffset(oy, os, is, is.GetSize() - 65536) &&
+ OggFindEOS(oy, os, packet);
+}