StandardMessageCodec decoding error with long strings #163
Description
Flutter Version
[✓] Flutter (Channel stable, v1.5.4-hotfix.2, on Mac OS X 10.14.5 18F132, locale en-CN)
Golang Version
go version go1.12.5 darwin/amd64
Steps to Reproduce
1、 Add plugin shared_preferences from https://github.com/go-flutter-desktop/plugins
2、 Call function "setString" with a very long string such as 60000 characters
panic: runtime error: slice bounds out of range
goroutine 1 [running, locked to thread]:
bytes.(*Buffer).Next(...)
/usr/local/Cellar/go/1.12.5/libexec/src/bytes/buffer.go:327
github.com/go-flutter-desktop/go-flutter/plugin.StandardMessageCodec.readByteSlice(0xc00014b5c0, 0x400b6eb, 0x10, 0x41ace80, 0xc0000d8701, 0xc000012d90)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/standard-message-codec.go:452 +0x2ab
github.com/go-flutter-desktop/go-flutter/plugin.StandardMessageCodec.readString(0xc00014b5c0, 0x5, 0xc000012d90, 0x0, 0x0)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/standard-message-codec.go:438 +0x2f
github.com/go-flutter-desktop/go-flutter/plugin.StandardMessageCodec.readValueAligned(0xc00014b5c0, 0xc387, 0x41ad080, 0xc000012d90, 0x0, 0x0)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/standard-message-codec.go:571 +0x500
github.com/go-flutter-desktop/go-flutter/plugin.StandardMessageCodec.readMap(0xc00014b5c0, 0xc387, 0xc0005de250, 0x0, 0x0)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/standard-message-codec.go:528 +0x102
github.com/go-flutter-desktop/go-flutter/plugin.StandardMessageCodec.readValueAligned(0xc00014b5c0, 0xc387, 0x41ad080, 0xc0005de250, 0x0, 0x0)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/standard-message-codec.go:589 +0x772
github.com/go-flutter-desktop/go-flutter/plugin.StandardMethodCodec.DecodeMethodCall(0xc00060a000, 0xc387, 0xc387, 0x4055f80, 0xc00010d160, 0xc0005b7920, 0x48, 0xc000000180, 0x411fd21)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/standard-method-codec.go:58 +0xe2
github.com/go-flutter-desktop/go-flutter/plugin.(*MethodChannel).handleChannelMessage(0xc000150140, 0xc00060a000, 0xc387, 0xc387, 0x4231860, 0xc00010d160, 0xc00010d160, 0x41d5f80)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/plugin/method-channel.go:129 +0x70
github.com/go-flutter-desktop/go-flutter.(*messenger).handlePlatformMessage(0xc0000be150, 0xc00014b590)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/messenger.go:79 +0x167
github.com/go-flutter-desktop/go-flutter/embedder.proxy_platform_message_callback(0x7ffeefbfd1f0, 0xc0000d8018)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/embedder/embedder_proxy.go:18 +0xe9
github.com/go-flutter-desktop/go-flutter/embedder._cgoexpwrap_30b92b790699_proxy_platform_message_callback(0x7ffeefbfd1f0, 0xc0000d8018)
_cgo_gotypes.go:448 +0x35
github.com/go-gl/glfw/v3.2/glfw._Cfunc_glfwWaitEventsTimeout(0x3f90624dd2f1a9fc)
_cgo_gotypes.go:1946 +0x41
github.com/go-gl/glfw/v3.2/glfw.WaitEventsTimeout(0x3f90624dd2f1a9fc)
/Users/*****/go/pkg/mod/github.com/go-gl/glfw@v0.0.0-20190519095719-e6da0acd62b1/v3.2/glfw/window.go:823 +0x2d
github.com/go-flutter-desktop/go-flutter.(*Application).Run(0xc0000d2000, 0x0, 0x0)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/application.go:229 +0xa0d
github.com/go-flutter-desktop/go-flutter.Run(0xc0000c0080, 0x4, 0x4, 0x2, 0xc0000b3f78)
/Users/*****/go/pkg/mod/github.com/go-flutter-desktop/go-flutter@v0.19.1-0.20190609200834-a6ff8ec870f4/application.go:23 +0x4d
main.main()
/Users/*****/desktop/cmd/main.go:24 +0x189