Update licenses for third_party (#76)

Closes #43.

* Added licenses to third_party with reference to generated files.
* Updated preambles for third-party code.
diff --git a/example/c_json/cjson_generated_bindings.dart b/example/c_json/cjson_generated_bindings.dart
index 7c41b0f..ada20c0 100644
--- a/example/c_json/cjson_generated_bindings.dart
+++ b/example/c_json/cjson_generated_bindings.dart
@@ -1,6 +1,26 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+//
+// 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
+// AUTHORS OR COPYRIGHT HOLDERS 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.
+
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Holds bindings to cJSON.
diff --git a/example/c_json/pubspec.yaml b/example/c_json/pubspec.yaml
index 1058579..1b53211 100644
--- a/example/c_json/pubspec.yaml
+++ b/example/c_json/pubspec.yaml
@@ -24,3 +24,24 @@
     include-directives:
       - '**cJSON.h'
   comments: false
+
+  preamble: |
+    // Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+    //
+    // 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
+    // AUTHORS OR COPYRIGHT HOLDERS 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.
diff --git a/example/libclang-example/generated_bindings.dart b/example/libclang-example/generated_bindings.dart
index 34a5cd2..3b2fc26 100644
--- a/example/libclang-example/generated_bindings.dart
+++ b/example/libclang-example/generated_bindings.dart
@@ -1,7 +1,11 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
+// Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Holds bindings to LibClang.
diff --git a/example/libclang-example/pubspec.yaml b/example/libclang-example/pubspec.yaml
index 246400a..ba3067f 100644
--- a/example/libclang-example/pubspec.yaml
+++ b/example/libclang-example/pubspec.yaml
@@ -59,14 +59,15 @@
   # False by default.
   array-workaround: true
 
-  # The header of the file, this is pasted as it is.
-  preamble: |
-    /// AUTO GENERATED FILE, DO NOT EDIT.
-    ///
-    /// Generated by `package:ffigen`.
-
   # Doc Comments for generated binings.
   # Comments can be disabled by using comments: false
   comments:
     style: doxygen # Options - doxygen(default) / any.
     length: full # Options - brief / full(default).
+
+  # The header of the file, this is pasted as it is.
+  preamble: |
+    // Part of the LLVM Project, under the Apache License v2.0 with LLVM
+    // Exceptions.
+    // See https://llvm.org/LICENSE.txt for license information.
+    // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
diff --git a/example/simple/generated_bindings.dart b/example/simple/generated_bindings.dart
index 1976074..9b0b3a2 100644
--- a/example/simple/generated_bindings.dart
+++ b/example/simple/generated_bindings.dart
@@ -1,6 +1,6 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Bindings to `headers/example.h`.
diff --git a/lib/src/code_generator/utils.dart b/lib/src/code_generator/utils.dart
index e91b5ee..5ee0e30 100644
--- a/lib/src/code_generator/utils.dart
+++ b/lib/src/code_generator/utils.dart
@@ -47,7 +47,7 @@
   UniqueNamer clone() => UniqueNamer._raw({..._usedUpNames});
 }
 
-/// Converts [text] to a dart doc comment.
+/// Converts [text] to a dart doc comment(`///`).
 ///
 /// Comment is split on new lines only.
 String makeDartDoc(String text) {
@@ -58,3 +58,15 @@
 
   return s.toString();
 }
+
+/// Converts [text] to a dart comment (`//`).
+///
+/// Comment is split on new lines only.
+String makeDoc(String text) {
+  final s = StringBuffer();
+  s.write('// ');
+  s.writeAll(text.split('\n'), '\n// ');
+  s.write('\n');
+
+  return s.toString();
+}
diff --git a/lib/src/code_generator/writer.dart b/lib/src/code_generator/writer.dart
index e09b9ed..41be178 100644
--- a/lib/src/code_generator/writer.dart
+++ b/lib/src/code_generator/writer.dart
@@ -105,12 +105,12 @@
     if (header != null) {
       s.write(header);
       s.write('\n');
-    } else {
-      // Write default header, in case none was provided.
-      s.write(makeDartDoc(
-          'AUTO GENERATED FILE, DO NOT EDIT.\n\nGenerated by `package:ffigen`.'));
     }
 
+    // Write auto generated declaration.
+    s.write(makeDoc(
+        'AUTO GENERATED FILE, DO NOT EDIT.\n\nGenerated by `package:ffigen`.'));
+
     // Write neccesary imports.
     s.write("import 'dart:ffi' as $ffiLibraryPrefix;\n");
     s.write('\n');
diff --git a/lib/src/header_parser/clang_bindings/clang_bindings.dart b/lib/src/header_parser/clang_bindings/clang_bindings.dart
index 61fe3d8..55c1903 100644
--- a/lib/src/header_parser/clang_bindings/clang_bindings.dart
+++ b/lib/src/header_parser/clang_bindings/clang_bindings.dart
@@ -1,6 +1,11 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
+// Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Holds bindings to LibClang.
diff --git a/test/code_generator_test.dart b/test/code_generator_test.dart
index 47c0ac7..7abf5df 100644
--- a/test/code_generator_test.dart
+++ b/test/code_generator_test.dart
@@ -78,9 +78,9 @@
         'test/debug_generated/Function-Binding-test-output.dart',
       );
       try {
-        expect(gen, '''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, '''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 class Bindings{
@@ -232,9 +232,9 @@
       final file = File('test/debug_generated/Struct-Binding-test-output.dart');
 
       try {
-        expect(gen, '''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, '''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Just a test struct
@@ -333,9 +333,9 @@
           File('test/debug_generated/Func-n-Struct-Binding-test-output.dart');
       try {
         //expect
-        expect(gen, '''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, '''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 class Bindings{
@@ -428,9 +428,9 @@
         'test/debug_generated/Global-Binding-test-output.dart',
       );
       try {
-        expect(gen, '''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, '''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 class Bindings{
@@ -489,9 +489,9 @@
         'test/debug_generated/Constant-test-output.dart',
       );
       try {
-        expect(gen, '''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, '''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 const int test1 = 20;
@@ -534,9 +534,9 @@
         'test/debug_generated/enum-class-test-output.dart',
       );
       try {
-        expect(gen, '''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, '''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// test line 1
@@ -608,9 +608,9 @@
         'test/debug_generated/internal-conflict-resolution.dart',
       );
       try {
-        expect(gen, r'''/// AUTO GENERATED FILE, DO NOT EDIT.
-/// 
-/// Generated by `package:ffigen`.
+        expect(gen, r'''// AUTO GENERATED FILE, DO NOT EDIT.
+// 
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 class init_dylib_1{
diff --git a/test/example_tests/cjson_example_test.dart b/test/example_tests/cjson_example_test.dart
index b4093a8..3d4536f 100644
--- a/test/example_tests/cjson_example_test.dart
+++ b/test/example_tests/cjson_example_test.dart
@@ -27,6 +27,26 @@
   ${strings.includeDirectives}:
     - '**cJSON.h'
 ${strings.comments}: false
+${strings.preamble}: |
+  // Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+  //
+  // 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
+  // AUTHORS OR COPYRIGHT HOLDERS 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.
 ''') as YamlMap);
       final library = parse(config);
 
diff --git a/test/example_tests/libclang_example_test.dart b/test/example_tests/libclang_example_test.dart
index 80cd96d..ac3feab 100644
--- a/test/example_tests/libclang_example_test.dart
+++ b/test/example_tests/libclang_example_test.dart
@@ -42,13 +42,15 @@
 ${strings.name}: 'LibClang'
 ${strings.description}: 'Holds bindings to LibClang.'
 ${strings.arrayWorkaround}: true
-${strings.preamble}: |
-  /// AUTO GENERATED FILE, DO NOT EDIT.
-  ///
-  /// Generated by `package:ffigen`.
 ${strings.comments}:
   ${strings.style}: ${strings.doxygen}
   ${strings.length}: ${strings.full}
+
+${strings.preamble}: |
+  // Part of the LLVM Project, under the Apache License v2.0 with LLVM
+  // Exceptions.
+  // See https://llvm.org/LICENSE.txt for license information.
+  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 ''') as YamlMap);
       final library = parse(config);
 
diff --git a/test/large_integration_tests/_expected_cjson_bindings.dart b/test/large_integration_tests/_expected_cjson_bindings.dart
index 2a33af3..a22dd73 100644
--- a/test/large_integration_tests/_expected_cjson_bindings.dart
+++ b/test/large_integration_tests/_expected_cjson_bindings.dart
@@ -1,6 +1,6 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Bindings to Cjson.
diff --git a/test/large_integration_tests/_expected_libclang_bindings.dart b/test/large_integration_tests/_expected_libclang_bindings.dart
index 1cbd2a2..4b6325b 100644
--- a/test/large_integration_tests/_expected_libclang_bindings.dart
+++ b/test/large_integration_tests/_expected_libclang_bindings.dart
@@ -1,6 +1,6 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Bindings to LibClang.
diff --git a/test/large_integration_tests/_expected_sqlite_bindings.dart b/test/large_integration_tests/_expected_sqlite_bindings.dart
index f2f0a23..7ca15ad 100644
--- a/test/large_integration_tests/_expected_sqlite_bindings.dart
+++ b/test/large_integration_tests/_expected_sqlite_bindings.dart
@@ -1,6 +1,6 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Bindings to SQLite.
diff --git a/test/native_test/native_test_bindings.dart b/test/native_test/native_test_bindings.dart
index fe4c945..28a2bce 100644
--- a/test/native_test/native_test_bindings.dart
+++ b/test/native_test/native_test_bindings.dart
@@ -1,6 +1,6 @@
-/// AUTO GENERATED FILE, DO NOT EDIT.
-///
-/// Generated by `package:ffigen`.
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
 import 'dart:ffi' as ffi;
 
 /// Native tests.
diff --git a/third_party/cjson_library/license.txt b/third_party/cjson_library/license.txt
new file mode 100644
index 0000000..287ef35
--- /dev/null
+++ b/third_party/cjson_library/license.txt
@@ -0,0 +1,24 @@
+Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+  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
+  AUTHORS OR COPYRIGHT HOLDERS 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.
+
+
+Files generated from cJSON source code are
+- example/c_json/cjson_generated_bindings.dart
+- test/large_integration_tests/_expected_cjson_bindings.dart
diff --git a/third_party/libclang/license.txt b/third_party/libclang/license.txt
new file mode 100644
index 0000000..428da30
--- /dev/null
+++ b/third_party/libclang/license.txt
@@ -0,0 +1,224 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+    1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      the copyright owner. For the purposes of this definition, "submitted"
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
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+    Copyright [yyyy] [name of copyright owner]
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+
+--- LLVM Exceptions to the Apache 2.0 License ----
+
+As an exception, if, as a result of your compiling your source code, portions
+of this Software are embedded into an Object form of such source code, you
+may redistribute such embedded portions in such Object form without complying
+with the conditions of Sections 4(a), 4(b) and 4(d) of the License.
+
+In addition, if you combine or link compiled forms of this Software with
+software that is licensed under the GPLv2 ("Combined Software") and if a
+court of competent jurisdiction determines that the patent provision (Section
+3), the indemnity provision (Section 9) or other Section of the License
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+Software.
+
+
+Files generated from libclang source code are
+- example/libclang-example/generated_bindings.dart
+- lib/src/header_parser/clang_bindings/clang_bindings.dart
+- test/large_integration_tests/_expected_libclang_bindings.dart
diff --git a/third_party/sqlite/license.txt b/third_party/sqlite/license.txt
new file mode 100644
index 0000000..d1a956a
--- /dev/null
+++ b/third_party/sqlite/license.txt
@@ -0,0 +1,11 @@
+2001-09-15
+
+The author disclaims copyright to this source code.  In place of
+a legal notice, here is a blessing:
+
+    May you do good and not evil.
+    May you find forgiveness for yourself and forgive others.
+    May you share freely, never taking more than you give.
+
+Files generated from sqlite source code are
+- test/large_integration_tests/_expected_sqlite_bindings.dart
diff --git a/tool/libclang_config.yaml b/tool/libclang_config.yaml
index a6db376..1f93991 100644
--- a/tool/libclang_config.yaml
+++ b/tool/libclang_config.yaml
@@ -23,6 +23,11 @@
     - '**CXString.h'
 
 array-workaround: true
+preamble: |
+  // Part of the LLVM Project, under the Apache License v2.0 with LLVM
+  // Exceptions.
+  // See https://llvm.org/LICENSE.txt for license information.
+  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
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