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- /*
- * @file circbuffer.h Buffer Utility Functions
- * @ingroup core
- *
- * Purple is the legal property of its developers, whose names are too numerous
- * to list here. Please refer to the COPYRIGHT file distributed with this
- * source distribution.
- *
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #ifndef _CIRCBUFFER_H
- #define _CIRCBUFFER_H
-
- #include <glib.h>
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- typedef struct _PurpleCircBuffer {
-
- /** A pointer to the starting address of our chunk of memory. */
- gchar *buffer;
-
- /** The incremental amount to increase this buffer by when
- * the buffer is not big enough to hold incoming data, in bytes. */
- gsize growsize;
-
- /** The length of this buffer, in bytes. */
- gsize buflen;
-
- /** The number of bytes of this buffer that contain unread data. */
- gsize bufused;
-
- /** A pointer to the next byte where new incoming data is
- * buffered to. */
- gchar *inptr;
-
- /** A pointer to the next byte of buffered data that should be
- * read by the consumer. */
- gchar *outptr;
-
- } PurpleCircBuffer;
-
- /**
- * Creates a new circular buffer. This will not allocate any memory for the
- * actual buffer until data is appended to it.
- *
- * @param growsize The amount that the buffer should grow the first time data
- * is appended and every time more space is needed. Pass in
- * "0" to use the default of 256 bytes.
- *
- * @return The new PurpleCircBuffer. This should be freed with
- * purple_circ_buffer_destroy when you are done with it
- */
- PurpleCircBuffer *purple_circ_buffer_new(gsize growsize);
-
- /**
- * Dispose of the PurpleCircBuffer and free any memory used by it (including any
- * memory used by the internal buffer).
- *
- * @param buf The PurpleCircBuffer to free
- */
- void purple_circ_buffer_destroy(PurpleCircBuffer *buf);
-
- /**
- * Append data to the PurpleCircBuffer. This will grow the internal
- * buffer to fit the added data, if needed.
- *
- * @param buf The PurpleCircBuffer to which to append the data
- * @param src pointer to the data to copy into the buffer
- * @param len number of bytes to copy into the buffer
- */
- void purple_circ_buffer_append(PurpleCircBuffer *buf, gconstpointer src, gsize len);
-
- /**
- * Determine the maximum number of contiguous bytes that can be read from the
- * PurpleCircBuffer.
- * Note: This may not be the total number of bytes that are buffered - a
- * subsequent call after calling purple_circ_buffer_mark_read() may indicate more
- * data is available to read.
- *
- * @param buf the PurpleCircBuffer for which to determine the maximum contiguous
- * bytes that can be read.
- *
- * @return the number of bytes that can be read from the PurpleCircBuffer
- */
- gsize purple_circ_buffer_get_max_read(const PurpleCircBuffer *buf);
-
- /**
- * Mark the number of bytes that have been read from the buffer.
- *
- * @param buf The PurpleCircBuffer to mark bytes read from
- * @param len The number of bytes to mark as read
- *
- * @return TRUE if we successfully marked the bytes as having been read, FALSE
- * otherwise.
- */
- gboolean purple_circ_buffer_mark_read(PurpleCircBuffer *buf, gsize len);
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* _CIRCBUFFER_H */
-