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-rw-r--r--src/decoder/plugins/DsdLib.cxx131
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diff --git a/src/decoder/plugins/DsdLib.cxx b/src/decoder/plugins/DsdLib.cxx
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+++ b/src/decoder/plugins/DsdLib.cxx
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+/*
+ * 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.
+ */
+
+/* \file
+ *
+ * This file contains functions used by the DSF and DSDIFF decoders.
+ *
+ */
+
+#include "config.h"
+#include "DsdLib.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
+#include "tag/TagId3.hxx"
+#include "util/Error.hxx"
+
+#include <string.h>
+
+#ifdef HAVE_ID3TAG
+#include <id3tag.h>
+#endif
+
+bool
+DsdId::Equals(const char *s) const
+{
+ assert(s != nullptr);
+ assert(strlen(s) == sizeof(value));
+
+ return memcmp(value, s, sizeof(value)) == 0;
+}
+
+/**
+ * Skip the #input_stream to the specified offset.
+ */
+bool
+dsdlib_skip_to(Decoder *decoder, InputStream &is,
+ uint64_t offset)
+{
+ if (is.IsSeekable())
+ return is.Seek(offset, IgnoreError());
+
+ if (uint64_t(is.GetOffset()) > offset)
+ return false;
+
+ return dsdlib_skip(decoder, is, offset - is.GetOffset());
+}
+
+/**
+ * Skip some bytes from the #input_stream.
+ */
+bool
+dsdlib_skip(Decoder *decoder, InputStream &is,
+ uint64_t delta)
+{
+ if (delta == 0)
+ return true;
+
+ if (is.IsSeekable())
+ return is.Seek(is.GetOffset() + delta, IgnoreError());
+
+ if (delta > 1024 * 1024)
+ /* don't skip more than one megabyte; it would be too
+ expensive */
+ return false;
+
+ return decoder_skip(decoder, is, delta);
+}
+
+#ifdef HAVE_ID3TAG
+void
+dsdlib_tag_id3(InputStream &is,
+ const struct tag_handler *handler,
+ void *handler_ctx, int64_t tagoffset)
+{
+ assert(tagoffset >= 0);
+
+ if (tagoffset == 0)
+ return;
+
+ if (!dsdlib_skip_to(nullptr, is, tagoffset))
+ return;
+
+ struct id3_tag *id3_tag = nullptr;
+ id3_length_t count;
+
+ /* Prevent broken files causing problems */
+ const auto size = is.GetSize();
+ const auto offset = is.GetOffset();
+ if (offset >= size)
+ return;
+
+ count = size - offset;
+
+ /* Check and limit id3 tag size to prevent a stack overflow */
+ if (count == 0 || count > 4096)
+ return;
+
+ id3_byte_t dsdid3[count];
+ id3_byte_t *dsdid3data;
+ dsdid3data = dsdid3;
+
+ if (!decoder_read_full(nullptr, is, dsdid3data, count))
+ return;
+
+ id3_tag = id3_tag_parse(dsdid3data, count);
+ if (id3_tag == nullptr)
+ return;
+
+ scan_id3_tag(id3_tag, handler, handler_ctx);
+
+ id3_tag_delete(id3_tag);
+
+ return;
+}
+#endif