Properly declare BSD 2-clause licensing.

Refs #7.

Author: icedream

LICENSE.txt

@@ -0,0 +1,22 @@
+Copyright (c) 2017-2022 Carl Kittelberger
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. 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.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.

README.md

@@ -87,3 +87,7 @@ go-bspatch "$your_old_file" "$your_new_file" "$the_generated"
 There is [a Go implementation of an older version of bsdiff called binarydist](https://github.com/kr/binarydist). The original bsdiff tool has since been updated so patches generating using the original tool are no longer compatible with the Go implementation. I don't know what the changes between the versions are and unfortunately I don't have the time to search for these changes and port them over as a pull request, otherwise I'd have done that instead.
 
 Additionally, @mendsley has already done the extra work of rewriting the code to be embeddable in any application code as a library. So why not make use of cgo, which I was going to look into in more detail at some point anyways?
+
+## License
+
+Just like bsdiff, this project is licensed under the 2-clause BSD license (or Simplified BSD license). You can check [LICENSE.txt](LICENSE.txt) for more information.

cmd/go-bsdiff/main.go

@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2022 Carl Kittelberger.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.txt file.
+
 package main
 
 import (

cmd/go-bspatch/main.go

@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2022 Carl Kittelberger.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.txt file.
+
 package main
 
 import (

diff/diff.go

@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2022 Carl Kittelberger.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.txt file.
+
 package diff
 
 import (

internal/magic.go

@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2022 Carl Kittelberger.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.txt file.
+
 package internal
 
 import (

internal/native/cgo.c

@@ -1,3 +1,9 @@
+/*
+ * Copyright (c) 2017-2022 Carl Kittelberger.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE.txt file.
+ */
+
 #include "cgo.h"
 
 #include "bsdiff.h"

internal/native/cgo.h

@@ -1,3 +1,9 @@
+/*
+ * Copyright (c) 2017-2022 Carl Kittelberger.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
 #include <stdlib.h>
 #include "stdint.h"
 

internal/native/cgo_read.go

@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2022 Carl Kittelberger.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.txt file.
+
 package native
 
 /*

internal/native/cgo_write.go

@@ -1,3 +1,7 @@
+// Copyright (c) 2017-2022 Carl Kittelberger.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.txt file.
+
 package native
 
 /*