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freeswitch/libs/spandsp/src/queue.c

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/*
* SpanDSP - a series of DSP components for telephony
*
* queue.c - simple in-process message queuing
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2004 Steve Underwood
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: queue.c,v 1.31 2009/04/11 18:11:19 steveu Exp $
*/
/*! \file */
#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <stdlib.h>
#include <inttypes.h>
#include <sys/types.h>
#define SPANDSP_FULLY_DEFINE_QUEUE_STATE_T
#include "spandsp/telephony.h"
#include "spandsp/queue.h"
#include "spandsp/private/queue.h"
SPAN_DECLARE(int) queue_empty(queue_state_t *s)
{
return (s->iptr == s->optr);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_free_space(queue_state_t *s)
{
int len;
if ((len = s->optr - s->iptr - 1) < 0)
len += s->len;
/*endif*/
return len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_contents(queue_state_t *s)
{
int len;
if ((len = s->iptr - s->optr) < 0)
len += s->len;
/*endif*/
return len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) queue_flush(queue_state_t *s)
{
s->optr = s->iptr;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_view(queue_state_t *s, uint8_t *buf, int len)
{
int real_len;
int to_end;
int iptr;
int optr;
/* Snapshot the values (although only iptr should be changeable during this processing) */
iptr = s->iptr;
optr = s->optr;
if ((real_len = iptr - optr) < 0)
real_len += s->len;
/*endif*/
if (real_len < len)
{
if (s->flags & QUEUE_READ_ATOMIC)
return -1;
/*endif*/
}
else
{
real_len = len;
}
/*endif*/
if (real_len == 0)
return 0;
/*endif*/
to_end = s->len - optr;
if (iptr < optr && to_end < real_len)
{
/* A two step process */
if (buf)
{
memcpy(buf, s->data + optr, to_end);
memcpy(buf + to_end, s->data, real_len - to_end);
}
/*endif*/
}
else
{
/* A one step process */
if (buf)
memcpy(buf, s->data + optr, real_len);
/*endif*/
}
/*endif*/
return real_len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_read(queue_state_t *s, uint8_t *buf, int len)
{
int real_len;
int to_end;
int new_optr;
int iptr;
int optr;
/* Snapshot the values (although only iptr should be changeable during this processing) */
iptr = s->iptr;
optr = s->optr;
if ((real_len = iptr - optr) < 0)
real_len += s->len;
/*endif*/
if (real_len < len)
{
if (s->flags & QUEUE_READ_ATOMIC)
return -1;
/*endif*/
}
else
{
real_len = len;
}
/*endif*/
if (real_len == 0)
return 0;
/*endif*/
to_end = s->len - optr;
if (iptr < optr && to_end < real_len)
{
/* A two step process */
if (buf)
{
memcpy(buf, s->data + optr, to_end);
memcpy(buf + to_end, s->data, real_len - to_end);
}
/*endif*/
new_optr = real_len - to_end;
}
else
{
/* A one step process */
if (buf)
memcpy(buf, s->data + optr, real_len);
/*endif*/
new_optr = optr + real_len;
if (new_optr >= s->len)
new_optr = 0;
/*endif*/
}
/*endif*/
/* Only change the pointer now we have really finished */
s->optr = new_optr;
return real_len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_read_byte(queue_state_t *s)
{
int real_len;
int to_end;
int iptr;
int optr;
int byte;
/* Snapshot the values (although only iptr should be changeable during this processing) */
iptr = s->iptr;
optr = s->optr;
if ((real_len = iptr - optr) < 0)
real_len += s->len;
/*endif*/
if (real_len < 1)
return -1;
/*endif*/
to_end = s->len - optr;
byte = s->data[optr];
if (++optr >= s->len)
optr = 0;
/*endif*/
/* Only change the pointer now we have really finished */
s->optr = optr;
return byte;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_write(queue_state_t *s, const uint8_t *buf, int len)
{
int real_len;
int to_end;
int new_iptr;
int iptr;
int optr;
/* Snapshot the values (although only optr should be changeable during this processing) */
iptr = s->iptr;
optr = s->optr;
if ((real_len = optr - iptr - 1) < 0)
real_len += s->len;
/*endif*/
if (real_len < len)
{
if (s->flags & QUEUE_WRITE_ATOMIC)
return -1;
/*endif*/
}
else
{
real_len = len;
}
/*endif*/
if (real_len == 0)
return 0;
/*endif*/
to_end = s->len - iptr;
if (iptr < optr || to_end >= real_len)
{
/* A one step process */
memcpy(s->data + iptr, buf, real_len);
new_iptr = iptr + real_len;
if (new_iptr >= s->len)
new_iptr = 0;
/*endif*/
}
else
{
/* A two step process */
memcpy(s->data + iptr, buf, to_end);
memcpy(s->data, buf + to_end, real_len - to_end);
new_iptr = real_len - to_end;
}
/*endif*/
/* Only change the pointer now we have really finished */
s->iptr = new_iptr;
return real_len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_write_byte(queue_state_t *s, uint8_t byte)
{
int real_len;
int iptr;
int optr;
/* Snapshot the values (although only optr should be changeable during this processing) */
iptr = s->iptr;
optr = s->optr;
if ((real_len = optr - iptr - 1) < 0)
real_len += s->len;
/*endif*/
if (real_len < 1)
{
if (s->flags & QUEUE_WRITE_ATOMIC)
return -1;
/*endif*/
return 0;
}
/*endif*/
s->data[iptr] = byte;
if (++iptr >= s->len)
iptr = 0;
/*endif*/
/* Only change the pointer now we have really finished */
s->iptr = iptr;
return 1;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_state_test_msg(queue_state_t *s)
{
uint16_t lenx;
if (queue_view(s, (uint8_t *) &lenx, sizeof(uint16_t)) != sizeof(uint16_t))
return -1;
/*endif*/
return lenx;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_read_msg(queue_state_t *s, uint8_t *buf, int len)
{
uint16_t lenx;
/* If we assume the write message was atomic, this read message should be
safe when conducted in multiple chunks */
if (queue_read(s, (uint8_t *) &lenx, sizeof(uint16_t)) != sizeof(uint16_t))
return -1;
/*endif*/
/* If we got this far, the actual message chunk should be guaranteed to be
available */
if (lenx == 0)
return 0;
/*endif*/
if ((int) lenx > len)
{
len = queue_read(s, buf, len);
/* Discard the rest of the message */
queue_read(s, NULL, lenx - len);
return len;
}
/*endif*/
return queue_read(s, buf, lenx);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_write_msg(queue_state_t *s, const uint8_t *buf, int len)
{
int real_len;
int to_end;
int new_iptr;
int iptr;
int optr;
uint16_t lenx;
/* Snapshot the values (although only optr should be changeable during this processing) */
iptr = s->iptr;
optr = s->optr;
if ((real_len = optr - iptr - 1) < 0)
real_len += s->len;
/*endif*/
if (real_len < len + (int) sizeof(uint16_t))
return -1;
/*endif*/
real_len = len + (int) sizeof(uint16_t);
to_end = s->len - iptr;
lenx = (uint16_t) len;
if (iptr < optr || to_end >= real_len)
{
/* A one step process */
memcpy(s->data + iptr, &lenx, sizeof(uint16_t));
memcpy(s->data + iptr + sizeof(uint16_t), buf, len);
new_iptr = iptr + real_len;
if (new_iptr >= s->len)
new_iptr = 0;
/*endif*/
}
else
{
/* A two step process */
if (to_end >= sizeof(uint16_t))
{
/* The actual message wraps around the end of the buffer */
memcpy(s->data + iptr, &lenx, sizeof(uint16_t));
memcpy(s->data + iptr + sizeof(uint16_t), buf, to_end - sizeof(uint16_t));
memcpy(s->data, buf + to_end - sizeof(uint16_t), real_len - to_end);
}
else
{
/* The message length wraps around the end of the buffer */
memcpy(s->data + iptr, (uint8_t *) &lenx, to_end);
memcpy(s->data, ((uint8_t *) &lenx) + to_end, sizeof(uint16_t) - to_end);
memcpy(s->data + sizeof(uint16_t) - to_end, buf, len);
}
new_iptr = real_len - to_end;
}
/*endif*/
/* Only change the pointer now we have really finished */
s->iptr = new_iptr;
return len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(queue_state_t *) queue_init(queue_state_t *s, int len, int flags)
{
if (s == NULL)
{
if ((s = (queue_state_t *) malloc(sizeof(*s) + len + 1)) == NULL)
return NULL;
}
s->iptr =
s->optr = 0;
s->flags = flags;
s->len = len + 1;
return s;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_release(queue_state_t *s)
{
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) queue_free(queue_state_t *s)
{
free(s);
return 0;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/
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