Update wrappers (#564)

* golang: add build information via `cgo.go`
* golang: fix lgwin parameter behavior
* Java: add proguard configuration

go/cbrotli/cgo.go

@@ -0,0 +1,13 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Distributed under MIT license.
+// See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+
+package cbrotli
+
+// Inform golang build system that it should link brotli libraries.
+
+// #cgo LDFLAGS: -lbrotlicommon
+// #cgo LDFLAGS: -lbrotlidec
+// #cgo LDFLAGS: -lbrotlienc
+import "C"

go/cbrotli/writer.go

@@ -56,9 +56,6 @@ type WriterOptions struct {
 	// LGWin is the base 2 logarithm of the sliding window size.
 	// Range is 10 to 24. 0 indicates automatic configuration based on Quality.
 	LGWin int
-	// BufferSize is the number of bytes to use to buffer encoded output.
-	// 0 indicates an implementation-defined default.
-	BufferSize int
 }
 
 // Writer implements io.WriteCloser by writing Brotli-encoded data to an
@@ -80,8 +77,10 @@ func NewWriter(dst io.Writer, options WriterOptions) *Writer {
 	state := C.BrotliEncoderCreateInstance(nil, nil, nil)
 	C.BrotliEncoderSetParameter(
 		state, C.BROTLI_PARAM_QUALITY, (C.uint32_t)(options.Quality))
-	C.BrotliEncoderSetParameter(
+	if options.LGWin > 0 {
-		state, C.BROTLI_PARAM_LGWIN, (C.uint32_t)(options.LGWin))
+		C.BrotliEncoderSetParameter(
+			state, C.BROTLI_PARAM_LGWIN, (C.uint32_t)(options.LGWin))
+	}
 	return &Writer{
 		dst:   dst,
 		state: state,

java/org/brotli/dec/BUILD

@@ -11,6 +11,7 @@ java_library(
         ["*.java"],
         exclude = ["*Test*.java"],
     ),
+    proguard_specs = ["proguard.cfg"],
 )
 
 java_library(

java/org/brotli/dec/proguard.cfg

@@ -0,0 +1,2 @@
+# DictionaryData is an optionally / dynamically loaded built-in dictionary.
+-keep class org.brotli.dec.DictionaryData