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-rw-r--r--src/growing_fifo.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/growing_fifo.c b/src/growing_fifo.c
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+++ b/src/growing_fifo.c
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+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "growing_fifo.h"
+#include "fifo_buffer.h"
+
+#include <assert.h>
+#include <string.h>
+
+/**
+ * Align buffer sizes at 8 kB boundaries. Must be a power of two.
+ */
+static const size_t GROWING_FIFO_ALIGN = 8192;
+
+/**
+ * Align the specified size to the next #GROWING_FIFO_ALIGN boundary.
+ */
+static size_t
+align(size_t size)
+{
+ return ((size - 1) | (GROWING_FIFO_ALIGN - 1)) + 1;
+}
+
+struct fifo_buffer *
+growing_fifo_new(void)
+{
+ return fifo_buffer_new(GROWING_FIFO_ALIGN);
+}
+
+void *
+growing_fifo_write(struct fifo_buffer **buffer_p, size_t length)
+{
+ assert(buffer_p != NULL);
+
+ struct fifo_buffer *buffer = *buffer_p;
+ assert(buffer != NULL);
+
+ size_t max_length;
+ void *p = fifo_buffer_write(buffer, &max_length);
+ if (p != NULL && max_length >= length)
+ return p;
+
+ /* grow */
+ size_t new_size = fifo_buffer_available(buffer) + length;
+ assert(new_size > fifo_buffer_capacity(buffer));
+ *buffer_p = buffer = fifo_buffer_realloc(buffer, align(new_size));
+
+ /* try again */
+ p = fifo_buffer_write(buffer, &max_length);
+ assert(p != NULL);
+ assert(max_length >= length);
+
+ return p;
+}
+
+void
+growing_fifo_append(struct fifo_buffer **buffer_p,
+ const void *data, size_t length)
+{
+ void *p = growing_fifo_write(buffer_p, length);
+ memcpy(p, data, length);
+ fifo_buffer_append(*buffer_p, length);
+}