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-rw-r--r--src/util/fifo_buffer.h164
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diff --git a/src/util/fifo_buffer.h b/src/util/fifo_buffer.h
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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.
- */
-
-/** \file
- *
- * This is a general purpose FIFO buffer library. You may append data
- * at the end, while another instance reads data from the beginning.
- * It is optimized for zero-copy usage: you get pointers to the real
- * buffer, where you may operate on.
- *
- * This library is not thread safe.
- */
-
-#ifndef MPD_FIFO_BUFFER_H
-#define MPD_FIFO_BUFFER_H
-
-#include <stdbool.h>
-#include <stddef.h>
-
-struct fifo_buffer;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * Creates a new #fifo_buffer object. Free this object with
- * fifo_buffer_free().
- *
- * @param size the size of the buffer in bytes
- * @return the new #fifo_buffer object
- */
-struct fifo_buffer *
-fifo_buffer_new(size_t size);
-
-void
-fifo_buffer_init(struct fifo_buffer *buffer, size_t size);
-
-/**
- * Change the capacity of the #fifo_buffer, while preserving existing
- * data.
- *
- * @param buffer the old buffer, may be NULL
- * @param new_size the requested new size of the #fifo_buffer; must
- * not be smaller than the data which is stored in the old buffer
- * @return the new buffer, may be NULL if the requested new size is 0
- */
-struct fifo_buffer *
-fifo_buffer_realloc(struct fifo_buffer *buffer, size_t new_size);
-
-/**
- * Frees the resources consumed by this #fifo_buffer object.
- */
-void
-fifo_buffer_free(struct fifo_buffer *buffer);
-
-/**
- * Return the capacity of the buffer, i.e. the size that was passed to
- * fifo_buffer_new().
- */
-size_t
-fifo_buffer_capacity(const struct fifo_buffer *buffer);
-
-/**
- * Return the number of bytes currently stored in the buffer.
- */
-size_t
-fifo_buffer_available(const struct fifo_buffer *buffer);
-
-/**
- * Clears all data currently in this #fifo_buffer object. This does
- * not overwrite the actuall buffer; it just resets the internal
- * pointers.
- */
-void
-fifo_buffer_clear(struct fifo_buffer *buffer);
-
-/**
- * Reads from the beginning of the buffer. To remove consumed data
- * from the buffer, call fifo_buffer_consume().
- *
- * @param buffer the #fifo_buffer object
- * @param length_r the maximum amount to read is returned here
- * @return a pointer to the beginning of the buffer, or NULL if the
- * buffer is empty
- */
-const void *
-fifo_buffer_read(const struct fifo_buffer *buffer, size_t *length_r);
-
-/**
- * Marks data at the beginning of the buffer as "consumed".
- *
- * @param buffer the #fifo_buffer object
- * @param length the number of bytes which were consumed
- */
-void
-fifo_buffer_consume(struct fifo_buffer *buffer, size_t length);
-
-/**
- * Prepares writing to the buffer. This returns a buffer which you
- * can write to. To commit the write operation, call
- * fifo_buffer_append().
- *
- * @param buffer the #fifo_buffer object
- * @param max_length_r the maximum amount to write is returned here
- * @return a pointer to the end of the buffer, or NULL if the buffer
- * is already full
- */
-void *
-fifo_buffer_write(struct fifo_buffer *buffer, size_t *max_length_r);
-
-/**
- * Commits the write operation initiated by fifo_buffer_write().
- *
- * @param buffer the #fifo_buffer object
- * @param length the number of bytes which were written
- */
-void
-fifo_buffer_append(struct fifo_buffer *buffer, size_t length);
-
-/**
- * Checks if the buffer is empty.
- */
-bool
-fifo_buffer_is_empty(struct fifo_buffer *buffer);
-
-/**
- * Checks if the buffer is full.
- */
-bool
-fifo_buffer_is_full(struct fifo_buffer *buffer);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif