From 718e3744195351130f4ce7dbe0613f4b3e23df93 Mon Sep 17 00:00:00 2001
From: paul <paul>
Date: Fri, 13 Dec 2002 20:15:29 +0000
Subject: Initial revision

---
 lib/stream.c | 479 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 479 insertions(+)
 create mode 100644 lib/stream.c

(limited to 'lib/stream.c')

diff --git a/lib/stream.c b/lib/stream.c
new file mode 100644
index 00000000..2d4de760
--- /dev/null
+++ b/lib/stream.c
@@ -0,0 +1,479 @@
+/*
+ * Packet interface
+ * Copyright (C) 1999 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra 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, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.  
+ */
+
+#include <zebra.h>
+
+#include "stream.h"
+#include "memory.h"
+#include "network.h"
+#include "prefix.h"
+
+
+/*A macro to check pointers in order to not
+  go behind the allocated mem block 
+  S -- stream reference
+  Z -- size of data to be written 
+*/
+
+#define CHECK_SIZE(S, Z) \
+	if (((S)->putp + (Z)) > (S)->size) \
+           (Z) = (S)->size - (S)->putp;
+
+/* Stream is fixed length buffer for network output/input. */
+
+/* Make stream buffer. */
+struct stream *
+stream_new (size_t size)
+{
+  struct stream *s;
+
+  s = XCALLOC (MTYPE_STREAM, sizeof (struct stream));
+
+  s->data = XCALLOC (MTYPE_STREAM_DATA, size);
+  s->size = size;
+  return s;
+}
+
+/* Free it now. */
+void
+stream_free (struct stream *s)
+{
+  XFREE (MTYPE_STREAM_DATA, s->data);
+  XFREE (MTYPE_STREAM, s);
+}
+
+unsigned long
+stream_get_getp (struct stream *s)
+{
+  return s->getp;
+}
+
+unsigned long
+stream_get_putp (struct stream *s)
+{
+  return s->putp;
+}
+
+unsigned long
+stream_get_endp (struct stream *s)
+{
+  return s->endp;
+}
+
+unsigned long
+stream_get_size (struct stream *s)
+{
+  return s->size;
+}
+
+/* Stream structre' stream pointer related functions.  */
+void
+stream_set_getp (struct stream *s, unsigned long pos)
+{
+  s->getp = pos;
+}
+
+void
+stream_set_putp (struct stream *s, unsigned long pos)
+{
+  s->putp = pos;
+}
+
+/* Forward pointer. */
+void
+stream_forward (struct stream *s, int size)
+{
+  s->getp += size;
+}
+
+/* Copy from stream to destination. */
+void
+stream_get (void *dst, struct stream *s, size_t size)
+{
+  memcpy (dst, s->data + s->getp, size);
+  s->getp += size;
+}
+
+/* Get next character from the stream. */
+u_char
+stream_getc (struct stream *s)
+{
+  u_char c;
+
+  c = s->data[s->getp];
+  s->getp++;
+  return c;
+}
+
+/* Get next character from the stream. */
+u_char
+stream_getc_from (struct stream *s, unsigned long from)
+{
+  u_char c;
+
+  c = s->data[from];
+  return c;
+}
+
+/* Get next word from the stream. */
+u_int16_t
+stream_getw (struct stream *s)
+{
+  u_int16_t w;
+
+  w = s->data[s->getp++] << 8;
+  w |= s->data[s->getp++];
+  return w;
+}
+
+/* Get next word from the stream. */
+u_int16_t
+stream_getw_from (struct stream *s, unsigned long from)
+{
+  u_int16_t w;
+
+  w = s->data[from++] << 8;
+  w |= s->data[from];
+  return w;
+}
+
+/* Get next long word from the stream. */
+u_int32_t
+stream_getl (struct stream *s)
+{
+  u_int32_t l;
+
+  l  = s->data[s->getp++] << 24;
+  l |= s->data[s->getp++] << 16;
+  l |= s->data[s->getp++] << 8;
+  l |= s->data[s->getp++];
+  return l;
+}
+
+/* Get next long word from the stream. */
+u_int32_t
+stream_get_ipv4 (struct stream *s)
+{
+  u_int32_t l;
+
+  memcpy (&l, s->data + s->getp, 4);
+  s->getp += 4;
+
+  return l;
+}
+
+/* Copy to source to stream. */
+void
+stream_put (struct stream *s, void *src, size_t size)
+{
+
+  CHECK_SIZE(s, size);
+
+  if (src)
+    memcpy (s->data + s->putp, src, size);
+  else
+    memset (s->data + s->putp, 0, size);
+
+  s->putp += size;
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+}
+
+/* Put character to the stream. */
+int
+stream_putc (struct stream *s, u_char c)
+{
+  if (s->putp >= s->size) return 0;
+
+  s->data[s->putp] = c;
+  s->putp++;
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+  return 1;
+}
+
+/* Put word to the stream. */
+int
+stream_putw (struct stream *s, u_int16_t w)
+{
+  if ((s->size - s->putp) < 2) return 0;
+
+  s->data[s->putp++] = (u_char)(w >>  8);
+  s->data[s->putp++] = (u_char) w;
+
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+  return 2;
+}
+
+/* Put long word to the stream. */
+int
+stream_putl (struct stream *s, u_int32_t l)
+{
+  if ((s->size - s->putp) < 4) return 0;
+
+  s->data[s->putp++] = (u_char)(l >> 24);
+  s->data[s->putp++] = (u_char)(l >> 16);
+  s->data[s->putp++] = (u_char)(l >>  8);
+  s->data[s->putp++] = (u_char)l;
+
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+  return 4;
+}
+
+int
+stream_putc_at (struct stream *s, unsigned long putp, u_char c)
+{
+  s->data[putp] = c;
+  return 1;
+}
+
+int
+stream_putw_at (struct stream *s, unsigned long putp, u_int16_t w)
+{
+  s->data[putp] = (u_char)(w >>  8);
+  s->data[putp + 1] = (u_char) w;
+  return 2;
+}
+
+int
+stream_putl_at (struct stream *s, unsigned long putp, u_int32_t l)
+{
+  s->data[putp] = (u_char)(l >> 24);
+  s->data[putp + 1] = (u_char)(l >> 16);
+  s->data[putp + 2] = (u_char)(l >>  8);
+  s->data[putp + 3] = (u_char)l;
+  return 4;
+}
+
+/* Put long word to the stream. */
+int
+stream_put_ipv4 (struct stream *s, u_int32_t l)
+{
+  if ((s->size - s->putp) < 4)
+    return 0;
+
+  memcpy (s->data + s->putp, &l, 4);
+  s->putp += 4;
+
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+  return 4;
+}
+
+/* Put long word to the stream. */
+int
+stream_put_in_addr (struct stream *s, struct in_addr *addr)
+{
+  if ((s->size - s->putp) < 4)
+    return 0;
+
+  memcpy (s->data + s->putp, addr, 4);
+  s->putp += 4;
+
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+  return 4;
+}
+
+/* Put prefix by nlri type format. */
+int
+stream_put_prefix (struct stream *s, struct prefix *p)
+{
+  u_char psize;
+
+  psize = PSIZE (p->prefixlen);
+
+  if ((s->size - s->putp) < psize) return 0;
+
+  stream_putc (s, p->prefixlen);
+  memcpy (s->data + s->putp, &p->u.prefix, psize);
+  s->putp += psize;
+  
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+
+  return psize;
+}
+
+/* Read size from fd. */
+int
+stream_read (struct stream *s, int fd, size_t size)
+{
+  int nbytes;
+
+  nbytes = readn (fd, s->data + s->putp, size);
+
+  if (nbytes > 0)
+    {
+      s->putp += nbytes;
+      s->endp += nbytes;
+    }
+  return nbytes;
+}
+
+/* Read size from fd. */
+int
+stream_read_unblock (struct stream *s, int fd, size_t size)
+{
+  int nbytes;
+  int val;
+
+  val = fcntl (fd, F_GETFL, 0);
+  fcntl (fd, F_SETFL, val|O_NONBLOCK);
+  nbytes = read (fd, s->data + s->putp, size);
+  fcntl (fd, F_SETFL, val);
+
+  if (nbytes > 0)
+    {
+      s->putp += nbytes;
+      s->endp += nbytes;
+    }
+  return nbytes;
+}
+
+/* Write data to buffer. */
+int
+stream_write (struct stream *s, u_char *ptr, size_t size)
+{
+
+  CHECK_SIZE(s, size);
+
+  memcpy (s->data + s->putp, ptr, size);
+  s->putp += size;
+  if (s->putp > s->endp)
+    s->endp = s->putp;
+  return size;
+}
+
+/* Return current read pointer. */
+u_char *
+stream_pnt (struct stream *s)
+{
+  return s->data + s->getp;
+}
+
+/* Check does this stream empty? */
+int
+stream_empty (struct stream *s)
+{
+  if (s->putp == 0 && s->endp == 0 && s->getp == 0)
+    return 1;
+  else
+    return 0;
+}
+
+/* Reset stream. */
+void
+stream_reset (struct stream *s)
+{
+  s->putp = 0;
+  s->endp = 0;
+  s->getp = 0;
+}
+
+/* Write stream contens to the file discriptor. */
+int
+stream_flush (struct stream *s, int fd)
+{
+  int nbytes;
+
+  nbytes = write (fd, s->data + s->getp, s->endp - s->getp);
+
+  return nbytes;
+}
+
+/* Stream first in first out queue. */
+
+struct stream_fifo *
+stream_fifo_new ()
+{
+  struct stream_fifo *new;
+ 
+  new = XCALLOC (MTYPE_STREAM_FIFO, sizeof (struct stream_fifo));
+  return new;
+}
+
+/* Add new stream to fifo. */
+void
+stream_fifo_push (struct stream_fifo *fifo, struct stream *s)
+{
+  if (fifo->tail)
+    fifo->tail->next = s;
+  else
+    fifo->head = s;
+     
+  fifo->tail = s;
+
+  fifo->count++;
+}
+
+/* Delete first stream from fifo. */
+struct stream *
+stream_fifo_pop (struct stream_fifo *fifo)
+{
+  struct stream *s;
+  
+  s = fifo->head; 
+
+  if (s)
+    { 
+      fifo->head = s->next;
+
+      if (fifo->head == NULL)
+	fifo->tail = NULL;
+    }
+
+  fifo->count--;
+
+  return s; 
+}
+
+/* Return first fifo entry. */
+struct stream *
+stream_fifo_head (struct stream_fifo *fifo)
+{
+  return fifo->head;
+}
+
+void
+stream_fifo_clean (struct stream_fifo *fifo)
+{
+  struct stream *s;
+  struct stream *next;
+
+  for (s = fifo->head; s; s = next)
+    {
+      next = s->next;
+      stream_free (s);
+    }
+  fifo->head = fifo->tail = NULL;
+  fifo->count = 0;
+}
+
+void
+stream_fifo_free (struct stream_fifo *fifo)
+{
+  stream_fifo_clean (fifo);
+  XFREE (MTYPE_STREAM_FIFO, fifo);
+}
-- 
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