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-rw-r--r--src/decoder/plugins/FlacIOHandle.cxx114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/decoder/plugins/FlacIOHandle.cxx b/src/decoder/plugins/FlacIOHandle.cxx
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+++ b/src/decoder/plugins/FlacIOHandle.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.
+ */
+
+#include "config.h"
+#include "FlacIOHandle.hxx"
+#include "util/Error.hxx"
+#include "Compiler.h"
+
+#include <errno.h>
+
+static size_t
+FlacIORead(void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle)
+{
+ InputStream *is = (InputStream *)handle;
+
+ uint8_t *const p0 = (uint8_t *)ptr, *p = p0,
+ *const end = p0 + size * nmemb;
+
+ /* libFLAC is very picky about short reads, and expects the IO
+ callback to fill the whole buffer (undocumented!) */
+
+ Error error;
+ while (p < end) {
+ size_t nbytes = is->LockRead(p, end - p, error);
+ if (nbytes == 0) {
+ if (!error.IsDefined())
+ /* end of file */
+ break;
+
+ if (error.IsDomain(errno_domain))
+ errno = error.GetCode();
+ else
+ /* just some random non-zero
+ errno value */
+ errno = EINVAL;
+ return 0;
+ }
+
+ p += nbytes;
+ }
+
+ /* libFLAC expects a clean errno after returning from the IO
+ callbacks (undocumented!) */
+ errno = 0;
+ return (p - p0) / size;
+}
+
+static int
+FlacIOSeek(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
+{
+ InputStream *is = (InputStream *)handle;
+
+ Error error;
+ return is->LockSeek(offset, whence, error) ? 0 : -1;
+}
+
+static FLAC__int64
+FlacIOTell(FLAC__IOHandle handle)
+{
+ InputStream *is = (InputStream *)handle;
+
+ return is->offset;
+}
+
+static int
+FlacIOEof(FLAC__IOHandle handle)
+{
+ InputStream *is = (InputStream *)handle;
+
+ return is->LockIsEOF();
+}
+
+static int
+FlacIOClose(gcc_unused FLAC__IOHandle handle)
+{
+ /* no-op because the libFLAC caller is repsonsible for closing
+ the #InputStream */
+
+ return 0;
+}
+
+const FLAC__IOCallbacks flac_io_callbacks = {
+ FlacIORead,
+ nullptr,
+ nullptr,
+ nullptr,
+ FlacIOEof,
+ FlacIOClose,
+};
+
+const FLAC__IOCallbacks flac_io_callbacks_seekable = {
+ FlacIORead,
+ nullptr,
+ FlacIOSeek,
+ FlacIOTell,
+ FlacIOEof,
+ FlacIOClose,
+};