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diff --git a/src/base/file_range.hh b/src/base/file_range.hh
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+/**
+ * Copyright (c) 2019, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef lnav_file_range_hh
+#define lnav_file_range_hh
+
+#include <sys/types.h>
+
+#include "intern_string.hh"
+
+using file_off_t = int64_t;
+using file_size_t = uint64_t;
+using file_ssize_t = int64_t;
+
+class file_range {
+public:
+    struct metadata {
+        bool m_valid_utf{true};
+        bool m_has_ansi{false};
+    };
+
+    file_off_t fr_offset{0};
+    file_ssize_t fr_size{0};
+    metadata fr_metadata;
+
+    void clear()
+    {
+        this->fr_offset = 0;
+        this->fr_size = 0;
+    }
+
+    ssize_t next_offset() const { return this->fr_offset + this->fr_size; }
+
+    bool empty() const { return this->fr_size == 0; }
+};
+
+struct source_location {
+    source_location()
+        : sl_source(intern_string::lookup("unknown")), sl_line_number(0)
+    {
+    }
+
+    explicit source_location(intern_string_t source, int32_t line = 0)
+        : sl_source(source), sl_line_number(line)
+    {
+    }
+
+    intern_string_t sl_source;
+    int32_t sl_line_number;
+};
+
+#endif