Vendor import of OpenSSH.

1 files changed, 161 insertions, 0 deletions

diff --git a/crypto/openssh/buffer.c b/crypto/openssh/buffer.c
new file mode 100644
index 0000000..6557934
--- /dev/null
+++ b/crypto/openssh/buffer.c
@@ -0,0 +1,161 @@
+/*
+ * 
+ * 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 1.4 1999/11/24 19:53:44 markus 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");
+}