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-rw-r--r--src/decoder/dsdlib.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/decoder/dsdlib.c b/src/decoder/dsdlib.c
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+/*
+ * Copyright (C) 2012 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 "dsf_decoder_plugin.h"
+#include "decoder_api.h"
+#include "util/bit_reverse.h"
+#include "dsdlib.h"
+#include "dsdiff_decoder_plugin.h"
+
+#include <unistd.h>
+#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
+
+bool
+dsdlib_id_equals(const struct dsdlib_id *id, const char *s)
+{
+ assert(id != NULL);
+ assert(s != NULL);
+ assert(strlen(s) == sizeof(id->value));
+
+ return memcmp(id->value, s, sizeof(id->value)) == 0;
+}
+
+bool
+dsdlib_read(struct decoder *decoder, struct input_stream *is,
+ void *data, size_t length)
+{
+ size_t nbytes = decoder_read(decoder, is, data, length);
+ return nbytes == length;
+}
+
+/**
+ * Skip the #input_stream to the specified offset.
+ */
+bool
+dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
+ goffset offset)
+{
+ if (is->seekable)
+ return input_stream_seek(is, offset, SEEK_SET, NULL);
+
+ if (is->offset > offset)
+ return false;
+
+ char buffer[8192];
+ while (is->offset < offset) {
+ size_t length = sizeof(buffer);
+ if (offset - is->offset < (goffset)length)
+ length = offset - is->offset;
+
+ size_t nbytes = decoder_read(decoder, is, buffer, length);
+ if (nbytes == 0)
+ return false;
+ }
+
+ assert(is->offset == offset);
+ return true;
+}
+
+/**
+ * Skip some bytes from the #input_stream.
+ */
+bool
+dsdlib_skip(struct decoder *decoder, struct input_stream *is,
+ goffset delta)
+{
+ assert(delta >= 0);
+
+ if (delta == 0)
+ return true;
+
+ if (is->seekable)
+ return input_stream_seek(is, delta, SEEK_CUR, NULL);
+
+ char buffer[8192];
+ while (delta > 0) {
+ size_t length = sizeof(buffer);
+ if ((goffset)length > delta)
+ length = delta;
+
+ size_t nbytes = decoder_read(decoder, is, buffer, length);
+ if (nbytes == 0)
+ return false;
+
+ delta -= nbytes;
+ }
+
+ return true;
+}
+