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diff --git a/hw/xfree86/common/xisb.h b/hw/xfree86/common/xisb.h
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+/*
+ * Copyright (c) 1997 Metro Link Incorporated
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Except as contained in this notice, the name of the Metro Link shall not be
+ * used in advertising or otherwise to promote the sale, use or other dealings
+ * in this Software without prior written authorization from Metro Link.
+ *
+ */
+/* $XFree86: xc/programs/Xserver/hw/xfree86/common/xisb.h,v 1.1 1998/12/05 14:40:10 dawes Exp $ */
+
+#ifndef _xisb_H_
+#define _xisb_H_
+
+/******************************************************************************
+ * Definitions
+ * structs, typedefs, #defines, enums
+ *****************************************************************************/
+
+typedef struct _XISBuffer
+{
+ int fd;
+ int trace;
+ int block_duration;
+ xf86ssize_t current; /* bytes read */
+ xf86ssize_t end;
+ xf86ssize_t buffer_size;
+ unsigned char *buf;
+} XISBuffer;
+
+/******************************************************************************
+ * Declarations
+ * variables: use xisb_LOC in front
+ * of globals.
+ * put locals in the .c file.
+ *****************************************************************************/
+XISBuffer * XisbNew (int fd, xf86ssize_t size);
+void XisbFree (XISBuffer *b);
+int XisbRead (XISBuffer *b);
+xf86ssize_t XisbWrite (XISBuffer *b, unsigned char *msg, xf86ssize_t len);
+void XisbTrace (XISBuffer *b, int trace);
+void XisbBlockDuration (XISBuffer *b, int block_duration);
+
+/*
+ * DO NOT PUT ANYTHING AFTER THIS ENDIF
+ */
+#endif