René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Long strings are truncated on packing on Android 4.x","articleBody":"The code below is an Android app that packs and then unpacks a map containing a single String member (`\"data\"`). On Android 4.4.2 this member is truncated when packing if it is 512 characters or longer; 511 or fewer and it works fine.\r\n\r\nThe problem does not occur on Android 5.x or 6.x.\r\n\r\n```\r\npackage my.app;\r\n\r\nimport android.app.Activity;\r\nimport android.os.Bundle;\r\nimport android.widget.Toast;\r\nimport android.util.Log;\r\n\r\nimport java.io.ByteArrayOutputStream;\r\nimport java.io.IOException;\r\n\r\nimport org.msgpack.core.MessageFormat;\r\nimport org.msgpack.core.MessagePack;\r\nimport org.msgpack.core.MessagePacker;\r\nimport org.msgpack.core.MessageUnpacker;\r\n\r\npublic class MainActivity extends Activity\r\n{\r\n    @Override\r\n    public void onCreate(Bundle savedInstanceState)\r\n    {\r\n        super.onCreate(savedInstanceState);\r\n        setContentView(R.layout.main);\r\n\r\n\t\ttry {\r\n\t\t\tTestClass testMessage = new TestClass();\r\n\t\t\ttestMessage.data = testString;\r\n\r\n\t\t\tbyte[] encoded = writeMsgpack(testMessage);\r\n\t\t\tTestClass decoded = readMsgpack(encoded);\r\n\r\n\t\t\tString received = decoded.data;\r\n\t\t\tif(received.equals(testString)) {\r\n\t\t\t\tToast.makeText(this, \"Test success\", Toast.LENGTH_LONG).show();\r\n\t\t\t} else {\r\n\t\t\t\tToast.makeText(this, \"Test fail\", Toast.LENGTH_LONG).show();\r\n\t\t\t\tLog.w(TAG, \"Decoded string data: \" + received);\r\n\t\t\t}\r\n\t\t} catch (Exception e) {\r\n\t\t\te.printStackTrace();\r\n\t\t}\r\n    }\r\n\r\n\tstatic byte[] writeMsgpack(TestClass message) {\r\n\t\tbyte[] result = null;\r\n\t\ttry {\r\n\t\t\tByteArrayOutputStream out = new ByteArrayOutputStream();\r\n\t\t\tMessagePacker packer = MessagePack.newDefaultPacker(out);\r\n\t\t\tmessage.writeMsgpack(packer);\r\n\t\t\tpacker.flush();\r\n\t\t\tresult = out.toByteArray();\r\n\t\t} catch(IOException ioe) {\r\n\t\t\tioe.printStackTrace();\r\n\t\t}\r\n\t\treturn result;\r\n\t}\r\n\r\n\tstatic TestClass readMsgpack(byte[] packed) {\r\n\t\tTestClass result = null;\r\n\t\ttry {\r\n\t\t\tMessageUnpacker unpacker = MessagePack.newDefaultUnpacker(packed);\r\n\t\t\tresult = (new TestClass()).readMsgpack(unpacker);\r\n\t\t} catch(IOException ioe) {\r\n\t\t\tioe.printStackTrace();\r\n\t\t}\r\n\t\treturn result;\r\n\t}\r\n\r\n\tstatic class TestClass {\r\n\t\tpublic String data;\r\n\r\n\t\tvoid writeMsgpack(MessagePacker packer) throws IOException {\r\n\t\t\tpacker.packMapHeader(1);\r\n\t\t\tpacker.packString(\"data\");\r\n\t\t\tpacker.packString(data);\r\n\t\t}\r\n\r\n\t\tTestClass readMsgpack(MessageUnpacker unpacker) throws IOException {\r\n\t\t\tunpacker.unpackMapHeader();\r\n\t\t\tString fieldName = unpacker.unpackString();\r\n\t\t\tMessageFormat fieldFormat = unpacker.getNextFormat();\r\n\t\t\tif(fieldFormat.equals(MessageFormat.NIL)) {\r\n\t\t\t\tunpacker.unpackNil();\r\n\t\t\t} else if(fieldName.equals(\"data\")) {\r\n\t\t\t\tdata = unpacker.unpackString();\r\n\t\t\t}\r\n\t\t\treturn this;\r\n\t\t}\r\n\t}\r\n\r\n//\t/* succeeds */\r\n//\tprivate static String testString = \"0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890\";\r\n\r\n\t/* fails */\r\n \tprivate static String testString = \"01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901\";\r\n\r\n\tprivate static final String TAG = \"MainActivity\";\r\n}\r\n```\r\n","author":{"url":"https://github.com/paddybyers","@type":"Person","name":"paddybyers"},"datePublished":"2016-12-29T23:02:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/406/msgpack-java/issues/406"}