--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/bitstream.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,148 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * bitstream.c - Bitstream composition and decomposition routines.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2006 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: bitstream.c,v 1.18.4.1 2009/12/28 12:20:46 steveu Exp $
+ */
+
+/*! \file */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "spandsp/telephony.h"
+#include "spandsp/bitstream.h"
+
+#include "spandsp/private/bitstream.h"
+
+SPAN_DECLARE(void) bitstream_put(bitstream_state_t *s, uint8_t **c, uint32_t value, int bits)
+{
+    value &= ((1 << bits) - 1);
+    if (s->lsb_first)
+    {
+        if (s->residue + bits <= 32)
+        {
+            s->bitstream |= (value << s->residue);
+            s->residue += bits;
+        }
+        while (s->residue >= 8)
+        {
+            s->residue -= 8;
+            *(*c)++ = (uint8_t) (s->bitstream & 0xFF);
+            s->bitstream >>= 8;
+        }
+    }
+    else
+    {
+        if (s->residue + bits <= 32)
+        {
+            s->bitstream = (s->bitstream << bits) | value;
+            s->residue += bits;
+        }
+        while (s->residue >= 8)
+        {
+            s->residue -= 8;
+            *(*c)++ = (uint8_t) ((s->bitstream >> s->residue) & 0xFF);
+        }
+    }
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(void) bitstream_flush(bitstream_state_t *s, uint8_t **c)
+{
+    if (s->residue > 0)
+    {
+        s->bitstream &= ((1 << s->residue) - 1);
+        if (s->lsb_first)
+            *(*c)++ = (uint8_t) s->bitstream;
+        else
+            *(*c)++ = (uint8_t) (s->bitstream << (8 - s->residue));
+        s->residue = 0;
+    }
+    s->bitstream = 0;
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(uint32_t) bitstream_get(bitstream_state_t *s, const uint8_t **c, int bits)
+{
+    uint32_t x;
+
+    if (s->lsb_first)
+    {
+        while (s->residue < bits)
+        {
+            s->bitstream |= (((uint32_t) *(*c)++) << s->residue);
+            s->residue += 8;
+        }
+        s->residue -= bits;
+        x = s->bitstream & ((1 << bits) - 1);
+        s->bitstream >>= bits;
+    }
+    else
+    {
+        while (s->residue < bits)
+        {
+            s->bitstream = (s->bitstream << 8) | ((uint32_t) *(*c)++);
+            s->residue += 8;
+        }
+        s->residue -= bits;
+        x = (s->bitstream >> s->residue) & ((1 << bits) - 1);
+    }
+    return x;
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(bitstream_state_t *) bitstream_init(bitstream_state_t *s, int lsb_first)
+{
+    if (s == NULL)
+    {
+        if ((s = (bitstream_state_t *) malloc(sizeof(*s))) == NULL)
+            return NULL;
+    }
+    s->bitstream = 0;
+    s->residue = 0;
+    s->lsb_first = lsb_first;
+    return s;
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(int) bitstream_release(bitstream_state_t *s)
+{
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(int) bitstream_free(bitstream_state_t *s)
+{
+    if (s)
+        free(s);
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/