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https://github.com/tuxbox-neutrino/neutrino.git
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474790557f
git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@124 e54a6e83-5905-42d5-8d5c-058d10e6a962
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
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* $Header: /cvs/tuxbox/apps/tuxbox/neutrino/src/driver/slotbuffer.c,v 1.1 2004/06/03 09:51:54 thegoodguy Exp $
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*
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* (C) 2004 by thegoodguy <thegoodguy@berlios.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/* Note: this slotbuffer "wastes" one slot */
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#include "slotbuffer.h"
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#include <stdlib.h>
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slotbuffer_t * slotbuffer_construct(const size_t size)
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{
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slotbuffer_t * slotbuffer;
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slotbuffer = malloc(sizeof(slotbuffer_t));
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slotbuffer->buffer = malloc(size);
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slotbuffer->size = size;
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slotbuffer->read_pointer = 0;
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slotbuffer->write_pointer = 0;
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return slotbuffer;
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}
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void slotbuffer_destruct(slotbuffer_t * const slotbuffer)
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{
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free(slotbuffer->buffer);
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free(slotbuffer);
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}
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size_t slotbuffer_remaining_read_space(slotbuffer_t * const slotbuffer)
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{
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ssize_t delta;
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delta = slotbuffer->write_pointer;
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delta -= slotbuffer->read_pointer;
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return (delta >= 0) ? (size_t)delta : (size_t)(delta + slotbuffer->size);
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}
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size_t slotbuffer_remaining_write_space(slotbuffer_t * const slotbuffer)
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{
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ssize_t delta;
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delta = slotbuffer->read_pointer;
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delta -= slotbuffer->write_pointer;
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return ((delta > 0) ? (size_t)delta : (size_t)(delta + slotbuffer->size)) - 1;
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}
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size_t slotbuffer_remaining_continuous_read_space(slotbuffer_t * const slotbuffer)
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{
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ssize_t delta;
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size_t read_pointer;
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delta = slotbuffer->write_pointer;
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read_pointer = slotbuffer->read_pointer;
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delta -= read_pointer;
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return (delta >= 0) ? (size_t)delta : (size_t)(slotbuffer->size - read_pointer);
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}
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size_t slotbuffer_remaining_continuous_write_space(slotbuffer_t * const slotbuffer)
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{
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ssize_t delta;
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size_t write_pointer;
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delta = slotbuffer->read_pointer;
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if (delta == 0)
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return (slotbuffer->size - slotbuffer->write_pointer - 1);
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write_pointer = slotbuffer->write_pointer;
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delta -= write_pointer;
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return (delta > 0) ? (size_t)(delta - 1) : (size_t)(slotbuffer->size - write_pointer);
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}
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void slotbuffer_advance_read_pointer(slotbuffer_t * const slotbuffer, const size_t delta)
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{
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slotbuffer->read_pointer += delta;
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if (slotbuffer->read_pointer >= slotbuffer->size)
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slotbuffer->read_pointer = 0;
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}
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void slotbuffer_advance_write_pointer(slotbuffer_t * const slotbuffer, const size_t delta)
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{
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slotbuffer->write_pointer += delta;
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if (slotbuffer->write_pointer >= slotbuffer->size)
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slotbuffer->write_pointer = 0;
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}
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