From 84959968510b547c35dddcbd0b9dcce9f25fdf8f Mon Sep 17 00:00:00 2001
From: deraadt <deraadt@openbsd.org>
Date: Sun, 26 Sep 1999 20:53:32 +0000
Subject: i bet a lot of people didn't know what ssh 1.2.16 had a nice license.
 well, except for the patent issues.  someone in sweden (forget their name at
 the moment) cleaned out most of the patented code, and now this code removes
 rsa code.  when this is done, it will link against libssl, but the work isn't
 completely done yet.  then we need to bring this up to modern days,
 featurewise.

---
 usr.bin/ssh/buffer.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 usr.bin/ssh/buffer.c

(limited to 'usr.bin/ssh/buffer.c')

diff --git a/usr.bin/ssh/buffer.c b/usr.bin/ssh/buffer.c
new file mode 100644
index 00000000000..0e81ac43588
--- /dev/null
+++ b/usr.bin/ssh/buffer.c
@@ -0,0 +1,150 @@
+/*
+
+buffer.c
+
+Author: Tatu Ylonen <ylo@cs.hut.fi>
+
+Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+                   All rights reserved
+
+Created: Sat Mar 18 04:15:33 1995 ylo
+
+Functions for manipulating fifo buffers (that can grow if needed).
+
+*/
+
+#include "includes.h"
+RCSID("$Id: buffer.c,v 1.1 1999/09/26 20:53:34 deraadt Exp $");
+
+#include "xmalloc.h"
+#include "buffer.h"
+#include "ssh.h"
+
+/* Initializes the buffer structure. */
+
+void buffer_init(Buffer *buffer)
+{
+  buffer->alloc = 4096;
+  buffer->buf = xmalloc(buffer->alloc);
+  buffer->offset = 0;
+  buffer->end = 0;
+}
+
+/* Frees any memory used for the buffer. */
+
+void buffer_free(Buffer *buffer)
+{
+  memset(buffer->buf, 0, buffer->alloc);
+  xfree(buffer->buf);
+}
+
+/* Clears any data from the buffer, making it empty.  This does not actually
+   zero the memory. */
+
+void buffer_clear(Buffer *buffer)
+{
+  buffer->offset = 0;
+  buffer->end = 0;
+}
+
+/* Appends data to the buffer, expanding it if necessary. */
+
+void buffer_append(Buffer *buffer, const char *data, unsigned int len)
+{
+  char *cp;
+  buffer_append_space(buffer, &cp, len);
+  memcpy(cp, data, len);
+}
+
+/* Appends space to the buffer, expanding the buffer if necessary.
+   This does not actually copy the data into the buffer, but instead
+   returns a pointer to the allocated region. */
+
+void buffer_append_space(Buffer *buffer, char **datap, unsigned int len)
+{
+  /* If the buffer is empty, start using it from the beginning. */
+  if (buffer->offset == buffer->end)
+    {
+      buffer->offset = 0;
+      buffer->end = 0;
+    }
+
+ restart:
+  /* If there is enough space to store all data, store it now. */
+  if (buffer->end + len < buffer->alloc)
+    {
+      *datap = buffer->buf + buffer->end;
+      buffer->end += len;
+      return;
+    }
+
+  /* If the buffer is quite empty, but all data is at the end, move the
+     data to the beginning and retry. */
+  if (buffer->offset > buffer->alloc / 2)
+    {
+      memmove(buffer->buf, buffer->buf + buffer->offset,
+	      buffer->end - buffer->offset);
+      buffer->end -= buffer->offset;
+      buffer->offset = 0;
+      goto restart;
+    }
+
+  /* Increase the size of the buffer and retry. */
+  buffer->alloc += len + 32768;
+  buffer->buf = xrealloc(buffer->buf, buffer->alloc);
+  goto restart;
+}
+
+/* Returns the number of bytes of data in the buffer. */
+
+unsigned int buffer_len(Buffer *buffer)
+{
+  return buffer->end - buffer->offset;
+}
+
+/* Gets data from the beginning of the buffer. */
+
+void buffer_get(Buffer *buffer, char *buf, unsigned int len)
+{
+  if (len > buffer->end - buffer->offset)
+    fatal("buffer_get trying to get more bytes than in buffer");
+  memcpy(buf, buffer->buf + buffer->offset, len);
+  buffer->offset += len;
+}
+
+/* Consumes the given number of bytes from the beginning of the buffer. */
+
+void buffer_consume(Buffer *buffer, unsigned int bytes)
+{
+  if (bytes > buffer->end - buffer->offset)
+    fatal("buffer_get trying to get more bytes than in buffer");
+  buffer->offset += bytes;
+}  
+
+/* Consumes the given number of bytes from the end of the buffer. */
+
+void buffer_consume_end(Buffer *buffer, unsigned int bytes)
+{
+  if (bytes > buffer->end - buffer->offset)
+    fatal("buffer_get trying to get more bytes than in buffer");
+  buffer->end -= bytes;
+}  
+
+/* Returns a pointer to the first used byte in the buffer. */
+
+char *buffer_ptr(Buffer *buffer)
+{
+  return buffer->buf + buffer->offset;
+}
+
+/* Dumps the contents of the buffer to stderr. */
+
+void buffer_dump(Buffer *buffer)
+{
+  int i;
+  unsigned char *ucp = (unsigned char *)buffer->buf;
+  
+  for (i = buffer->offset; i < buffer->end; i++)
+    fprintf(stderr, " %02x", ucp[i]);
+  fprintf(stderr, "\n");
+}
-- 
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