From: mdw <mdw>
Date: Sat, 3 Mar 2001 12:06:48 +0000 (+0000)
Subject: Use 16-bit lengths on MPs, since there's a packet limit of 64K anyway.
X-Git-Tag: 1.0.0pre1~2
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/tripe/commitdiff_plain/9a8120904fa2fde909d3aa2101a2184397d881f6?hp=0a9920e2dbc0891b418eed3366b59bb65c21c88c

Use 16-bit lengths on MPs, since there's a packet limit of 64K anyway.
---

diff --git a/buf.c b/buf.c
index f2d9f04d..fdc7856a 100644
--- a/buf.c
+++ b/buf.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: buf.c,v 1.2 2001/02/16 21:23:20 mdw Exp $
+ * $Id: buf.c,v 1.3 2001/03/03 12:06:48 mdw Exp $
  *
  * Buffer handling
  *
@@ -29,6 +29,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: buf.c,v $
+ * Revision 1.3  2001/03/03 12:06:48  mdw
+ * Use 16-bit lengths on MPs, since there's a packet limit of 64K anyway.
+ *
  * Revision 1.2  2001/02/16 21:23:20  mdw
  * Various minor changes.  Check that MPs are in canonical form when
  * loading.
@@ -176,7 +179,45 @@ int buf_putbyte(buf *b, int ch)
   return (0);
 }
 
-/* --- @buf_getword@ --- *
+/* --- @buf_getu16@ --- *
+ *
+ * Arguments:	@buf *b@ = pointer to a buffer block
+ *		@uint16 *w@ = where to put the word
+ *
+ * Returns:	Zero if OK, or nonzero if there wasn't a word there.
+ *
+ * Use:		Gets a 16-bit word from a buffer.
+ */
+
+int buf_getu16(buf *b, uint16 *w)
+{
+  if (BENSURE(b, 2))
+    return (-1);
+  *w = LOAD16(b->p);
+  BSTEP(b, 2);
+  return (0);
+}
+
+/* --- @buf_putu16@ --- *
+ *
+ * Arguments:	@buf *b@ = pointer to a buffer block
+ *		@uint16 w@ = word to write
+ *
+ * Returns:	Zero if OK, nonzero if there wasn't enough space.
+ *
+ * Use:		Puts a 16-but word in a buffer.
+ */
+
+int buf_putu16(buf *b, uint16 w)
+{
+  if (BENSURE(b, 2))
+    return (-1);
+  STORE16(b->p, w);
+  BSTEP(b, 2);
+  return (0);
+}
+
+/* --- @buf_getu32@ --- *
  *
  * Arguments:	@buf *b@ = pointer to a buffer block
  *		@uint32 *w@ = where to put the word
@@ -186,7 +227,7 @@ int buf_putbyte(buf *b, int ch)
  * Use:		Gets a 32-bit word from a buffer.
  */
 
-int buf_getword(buf *b, uint32 *w)
+int buf_getu32(buf *b, uint32 *w)
 {
   if (BENSURE(b, 4))
     return (-1);
@@ -195,7 +236,7 @@ int buf_getword(buf *b, uint32 *w)
   return (0);
 }
 
-/* --- @buf_putword@ --- *
+/* --- @buf_putu32@ --- *
  *
  * Arguments:	@buf *b@ = pointer to a buffer block
  *		@uint32 w@ = word to write
@@ -205,7 +246,7 @@ int buf_getword(buf *b, uint32 *w)
  * Use:		Puts a 32-but word in a buffer.
  */
 
-int buf_putword(buf *b, uint32 w)
+int buf_putu32(buf *b, uint32 w)
 {
   if (BENSURE(b, 4))
     return (-1);
@@ -225,9 +266,9 @@ int buf_putword(buf *b, uint32 w)
 
 mp *buf_getmp(buf *b)
 {
-  uint32 sz;
+  uint16 sz;
   mp *m;
-  if (buf_getword(b, &sz) || buf_ensure(b, sz))
+  if (buf_getu16(b, &sz) || buf_ensure(b, sz))
     return (0);
   m = mp_loadb(MP_NEW, BCUR(b), sz);
   if (mp_octets(m) != sz) {
@@ -251,7 +292,8 @@ mp *buf_getmp(buf *b)
 int buf_putmp(buf *b, mp *m)
 {
   size_t sz = mp_octets(m);
-  if (buf_putword(b, sz) || buf_ensure(b, sz))
+  assert(sz < MASK16);
+  if (buf_putu16(b, sz) || buf_ensure(b, sz))
     return (-1);
   mp_storeb(m, BCUR(b), sz);
   BSTEP(b, sz);