From 212fb431141cc324a288e942d102c8cdcf35e7c5 Mon Sep 17 00:00:00 2001
From: Pekka Riikonen <priikone@silcnet.org>
Date: Sat, 4 Nov 2006 19:54:28 +0000
Subject: [PATCH] 	Added silc_buffer_start, silc_buffer_end,
 silc_buffer_enlarge and 	silc_buffer_senlarge.

---
 lib/silcutil/silcbuffer.h | 112 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)

diff --git a/lib/silcutil/silcbuffer.h b/lib/silcutil/silcbuffer.h
index 78d99df2..c3148cb3 100644
--- a/lib/silcutil/silcbuffer.h
+++ b/lib/silcutil/silcbuffer.h
@@ -737,6 +737,48 @@ void silc_buffer_clear(SilcBuffer sb)
   silc_buffer_reset(sb);
 }
 
+/****f* silcutil/SilcBufferAPI/silc_buffer_start
+ *
+ * SYNOPSIS
+ *
+ *    static inline
+ *    void silc_buffer_start(SilcBuffer sb);
+ *
+ * DESCRIPTION
+ *
+ *    Moves the data area at the start of the buffer.  The tail area remains
+ *    as is.
+ *
+ ***/
+
+static inline
+void silc_buffer_start(SilcBuffer sb)
+{
+  sb->data = sb->head;
+}
+
+/****f* silcutil/SilcBufferAPI/silc_buffer_end
+ *
+ * SYNOPSIS
+ *
+ *    static inline
+ *    void silc_buffer_end(SilcBuffer sb);
+ *
+ * DESCRIPTION
+ *
+ *    Moves the end of the data area to the end of the buffer.  The start
+ *    of the data area remains same.  If the start of data area is at the
+ *    start of the buffer, after this function returns the buffer's data
+ *    area length is the length of the entire buffer.
+ *
+ ***/
+
+static inline
+void silc_buffer_end(SilcBuffer sb)
+{
+  sb->tail = sb->end;
+}
+
 /****f* silcutil/SilcBufferAPI/silc_buffer_copy
  *
  * SYNOPSIS
@@ -861,6 +903,39 @@ SilcBuffer silc_buffer_realloc_size(SilcBuffer sb, SilcUInt32 newsize)
   return sb;
 }
 
+/****f* silcutil/SilcBufferAPI/silc_buffer_enlarge
+ *
+ * SYNOPSIS
+ *
+ *    static inline
+ *    SilcBuffer silc_buffer_enlarge(SilcBuffer sb, SilcUInt32 size);
+ *
+ * DESCRIPTION
+ *
+ *    Enlarges the buffer by the amount of `size' if it doesn't have that
+ *    must space in the data area and in the tail area.  Moves the tail
+ *    area automatically after enlarging so that the current data area
+ *    is at least the size of `size'.  If there is more space than `size'
+ *    in the data area this does not do anything.  If there is enough
+ *    space in the tail area this merely moves the tail area to reveal
+ *    the extra space.  Returns FALSE on error.
+ *
+ ***/
+
+static inline
+SilcBool silc_buffer_enlarge(SilcBuffer sb, SilcUInt32 size)
+{
+  if (size > silc_buffer_len(sb)) {
+    if (size > silc_buffer_taillen(sb) + silc_buffer_len(sb))
+      if (!silc_buffer_realloc(sb, silc_buffer_truelen(sb) +
+			       (size - silc_buffer_taillen(sb) -
+				silc_buffer_len(sb))))
+	return FALSE;
+    silc_buffer_pull_tail(sb, size - silc_buffer_len(sb));
+  }
+  return TRUE;
+}
+
 
 /* SilcStack aware SilcBuffer routines */
 
@@ -1020,6 +1095,43 @@ SilcBuffer silc_buffer_srealloc_size(SilcStack stack,
   return sb;
 }
 
+/****f* silcutil/SilcBufferAPI/silc_buffer_senlarge
+ *
+ * SYNOPSIS
+ *
+ *    static inline
+ *    SilcBuffer silc_buffer_senlarge(SilcStack stack, SilcBuffer sb,
+ *                                    SilcUInt32 size);
+ *
+ * DESCRIPTION
+ *
+ *    Enlarges the buffer by the amount of `size' if it doesn't have that
+ *    must space in the data area and in the tail area.  Moves the tail
+ *    area automatically after enlarging so that the current data area
+ *    is at least the size of `size'.  If there is more space than `size'
+ *    in the data area this does not do anything.  If there is enough
+ *    space in the tail area this merely moves the tail area to reveal
+ *    the extra space.  Returns FALSE on error.
+ *
+ *    This routine use SilcStack are memory source.  If `stack' is NULL
+ *    reverts back to normal allocating routine.
+ *
+ ***/
+
+static inline
+SilcBool silc_buffer_senlarge(SilcStack stack, SilcBuffer sb, SilcUInt32 size)
+{
+  if (size > silc_buffer_len(sb)) {
+    if (size > silc_buffer_taillen(sb) + silc_buffer_len(sb))
+      if (!silc_buffer_srealloc(stack, sb, silc_buffer_truelen(sb) +
+				(size - silc_buffer_taillen(sb) -
+				 silc_buffer_len(sb))))
+	return FALSE;
+    silc_buffer_pull_tail(sb, size - silc_buffer_len(sb));
+  }
+  return TRUE;
+}
+
 /****f* silcutil/SilcBufferAPI/silc_buffer_scopy
  *
  * SYNOPSIS
-- 
2.24.0