updates.

[silc.git] / lib / silcutil / silcbuffer.h

diff --git a/lib/silcutil/silcbuffer.h b/lib/silcutil/silcbuffer.h
index b91d6cb67ad50f79b658818bddeea43ebd5a3d6e..9a64329e6c3e426c5de7c353f269367882b584da 100644 (file)
--- a/lib/silcutil/silcbuffer.h
+++ b/lib/silcutil/silcbuffer.h
@@ -1,16 +1,15 @@
 /*
 
-  silcbuffer.h
+  silcbuffer.h 
 
-  Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+  Author: Pekka Riikonen <priikone@silcnet.org>
 
-  Copyright (C) 1998 - 2000 Pekka Riikonen
+  Copyright (C) 1998 - 2002 Pekka Riikonen
 
   This program 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 of the License, or
-  (at your option) any later version.
-  
+  the Free Software Foundation; version 2 of the License.
+
   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
@@ -367,4 +366,78 @@ unsigned char *silc_buffer_put_tail(SilcBuffer sb,
   return (unsigned char *)memcpy(sb->tail, data, len);
 }
 
+/* Clears and initialiazes the buffer to the state as if it was just
+   allocated by silc_buffer_alloc. */
+
+static inline
+void silc_buffer_clear(SilcBuffer sb)
+{
+  memset(sb->head, 0, sb->truelen);
+  sb->data = sb->head;
+  sb->tail = sb->head;
+  sb->len = 0;
+}
+
+/* Generates copy of a SilcBuffer. This copies everything inside the
+   currently valid data area, nothing more. Use silc_buffer_clone to
+   copy entire buffer. */
+
+static inline
+SilcBuffer silc_buffer_copy(SilcBuffer sb)
+{
+  SilcBuffer sb_new;
+
+  sb_new = silc_buffer_alloc(sb->len);
+  silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
+  silc_buffer_put(sb_new, sb->data, sb->len);
+
+  return sb_new;
+}
+
+/* Clones SilcBuffer. This generates new SilcBuffer and copies
+   everything from the source buffer. The result is exact clone of
+   the original buffer. */
+
+static inline
+SilcBuffer silc_buffer_clone(SilcBuffer sb)
+{
+  SilcBuffer sb_new;
+
+  sb_new = silc_buffer_alloc(sb->truelen);
+  silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
+  silc_buffer_put(sb_new, sb->head, sb->truelen);
+  sb_new->data = sb_new->head + (sb->data - sb->head);
+  sb_new->tail = sb_new->data + sb->len;
+  sb_new->len = sb->len;
+
+  return sb_new;
+}
+
+/* Reallocates buffer. Old data is saved into the new buffer. Returns
+   new SilcBuffer pointer. The buffer is exact clone of the old one
+   except that there is now more space at the end of buffer. */
+
+static inline
+SilcBuffer silc_buffer_realloc(SilcBuffer sb, uint32 newsize)
+{
+  SilcBuffer sb_new;
+
+  if (!sb)
+    return silc_buffer_alloc(newsize);
+
+  if (newsize <= sb->truelen)
+    return sb;
+
+  sb_new = silc_buffer_alloc(newsize);
+  silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
+  silc_buffer_put(sb_new, sb->head, sb->truelen);
+  sb_new->data = sb_new->head + (sb->data - sb->head);
+  sb_new->tail = sb_new->data + sb->len;
+  sb_new->len = sb->len;
+
+  silc_buffer_free(sb);
+
+  return sb_new;
+}
+
 #endif