Specify charset when constructing InputStreamReader

ErrorProne warns [1] about implicit use of the platform default charset,
which can result in differing behaviour between JVM executions or
incorrect behavior if the encoding of the data source doesn't match
expectations.

[1] http://errorprone.info/bugpattern/DefaultCharset

Change-Id: I0fd489d352170339c3867355cd24324dfdbd4b59
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPrePushHook.java

@@ -221,7 +221,7 @@ public class LfsPrePushHook extends PrePushHook {
 	private void uploadContents(HttpConnection api,
 			Map<String, LfsPointer> oid2ptr) throws IOException {
 		try (JsonReader reader = new JsonReader(
-				new InputStreamReader(api.getInputStream()))) {
+				new InputStreamReader(api.getInputStream(), CHARSET))) {
 			for (Protocol.ObjectInfo o : parseObjects(reader)) {
 				if (o.actions == null) {
 					continue;

org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/SmudgeFilter.java

@@ -179,7 +179,8 @@ public class SmudgeFilter extends FilterCommand {
 							Integer.valueOf(responseCode)));
 		}
 		try (JsonReader reader = new JsonReader(
-				new InputStreamReader(lfsServerConn.getInputStream()))) {
+				new InputStreamReader(lfsServerConn.getInputStream(),
+						CHARSET))) {
 			Protocol.Response resp = gson.fromJson(reader,
 					Protocol.Response.class);
 			for (Protocol.ObjectInfo o : resp.objects) {

org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java

@@ -170,7 +170,7 @@ public class IndexDiffWithSymlinkTest extends LocalDiskRepositoryTestCase {
 
 	private String readStream(InputStream stream) throws IOException {
 		try (BufferedReader in = new BufferedReader(
-				new InputStreamReader(stream))) {
+				new InputStreamReader(stream, CHARSET))) {
 			StringBuilder out = new StringBuilder();
 			String line;
 			while ((line = in.readLine()) != null) {

org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/CrissCrossMergeTest.java

@@ -42,6 +42,8 @@
  */
 package org.eclipse.jgit.merge;
 
+import static org.eclipse.jgit.lib.Constants.CHARSET;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -881,7 +883,7 @@ public class CrissCrossMergeTest extends RepositoryTestCase {
 		StringBuilder result = new StringBuilder();
 		ObjectReader or = r.newObjectReader();
 		try (BufferedReader br = new BufferedReader(
-				new InputStreamReader(or.open(blobId).openStream()))) {
+				new InputStreamReader(or.open(blobId).openStream(), CHARSET))) {
 			String line;
 			boolean first = true;
 			while ((line = br.readLine()) != null) {

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/WalkEncryptionTest.java

@@ -420,7 +420,7 @@ public class WalkEncryptionTest {
 				c.setConnectTimeout(500);
 				c.setReadTimeout(500);
 				try (BufferedReader reader = new BufferedReader(
-						new InputStreamReader(c.getInputStream()))) {
+						new InputStreamReader(c.getInputStream(), CHARSET))) {
 					return reader.readLine();
 				}
 			} catch (UnknownHostException | SocketTimeoutException e) {