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-rw-r--r--src/decoder/FLACIOHandle.cxx114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/decoder/FLACIOHandle.cxx b/src/decoder/FLACIOHandle.cxx
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+++ b/src/decoder/FLACIOHandle.cxx
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+/*
+ * Copyright (C) 2003-2012 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.
+ */
+
+#include "config.h"
+#include "FLACIOHandle.hxx"
+#include "io_error.h"
+#include "gcc.h"
+
+#include <errno.h>
+
+static size_t
+FLACIORead(void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle)
+{
+ input_stream *is = (input_stream *)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!) */
+
+ GError *error = nullptr;
+ while (p < end) {
+ size_t nbytes = input_stream_lock_read(is, p, end - p, &error);
+ if (nbytes == 0) {
+ if (error == nullptr)
+ /* end of file */
+ break;
+
+ if (error->domain == errno_quark())
+ errno = error->code;
+ else
+ /* just some random non-zero
+ errno value */
+ errno = EINVAL;
+ g_error_free(error);
+ 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)
+{
+ input_stream *is = (input_stream *)handle;
+
+ return input_stream_lock_seek(is, offset, whence, nullptr) ? 0 : -1;
+}
+
+static FLAC__int64
+FLACIOTell(FLAC__IOHandle handle)
+{
+ input_stream *is = (input_stream *)handle;
+
+ return is->offset;
+}
+
+static int
+FLACIOEof(FLAC__IOHandle handle)
+{
+ input_stream *is = (input_stream *)handle;
+
+ return input_stream_lock_eof(is);
+}
+
+static int
+FLACIOClose(gcc_unused FLAC__IOHandle handle)
+{
+ /* no-op because the libFLAC caller is repsonsible for closing
+ the #input_stream */
+
+ 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,
+};