/usr/share/gocode/src/github.com/mitchellh/go-vnc/server_messages.go is in golang-github-mitchellh-go-vnc-dev 0.0~git20150629.0.723ed98-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | package vnc
import (
"encoding/binary"
"fmt"
"io"
)
// A ServerMessage implements a message sent from the server to the client.
type ServerMessage interface {
// The type of the message that is sent down on the wire.
Type() uint8
// Read reads the contents of the message from the reader. At the point
// this is called, the message type has already been read from the reader.
// This should return a new ServerMessage that is the appropriate type.
Read(*ClientConn, io.Reader) (ServerMessage, error)
}
// FramebufferUpdateMessage consists of a sequence of rectangles of
// pixel data that the client should put into its framebuffer.
type FramebufferUpdateMessage struct {
Rectangles []Rectangle
}
// Rectangle represents a rectangle of pixel data.
type Rectangle struct {
X uint16
Y uint16
Width uint16
Height uint16
Enc Encoding
}
func (*FramebufferUpdateMessage) Type() uint8 {
return 0
}
func (*FramebufferUpdateMessage) Read(c *ClientConn, r io.Reader) (ServerMessage, error) {
// Read off the padding
var padding [1]byte
if _, err := io.ReadFull(r, padding[:]); err != nil {
return nil, err
}
var numRects uint16
if err := binary.Read(r, binary.BigEndian, &numRects); err != nil {
return nil, err
}
// Build the map of encodings supported
encMap := make(map[int32]Encoding)
for _, enc := range c.Encs {
encMap[enc.Type()] = enc
}
// We must always support the raw encoding
rawEnc := new(RawEncoding)
encMap[rawEnc.Type()] = rawEnc
rects := make([]Rectangle, numRects)
for i := uint16(0); i < numRects; i++ {
var encodingType int32
rect := &rects[i]
data := []interface{}{
&rect.X,
&rect.Y,
&rect.Width,
&rect.Height,
&encodingType,
}
for _, val := range data {
if err := binary.Read(r, binary.BigEndian, val); err != nil {
return nil, err
}
}
enc, ok := encMap[encodingType]
if !ok {
return nil, fmt.Errorf("unsupported encoding type: %d", encodingType)
}
var err error
rect.Enc, err = enc.Read(c, rect, r)
if err != nil {
return nil, err
}
}
return &FramebufferUpdateMessage{rects}, nil
}
// SetColorMapEntriesMessage is sent by the server to set values into
// the color map. This message will automatically update the color map
// for the associated connection, but contains the color change data
// if the consumer wants to read it.
//
// See RFC 6143 Section 7.6.2
type SetColorMapEntriesMessage struct {
FirstColor uint16
Colors []Color
}
func (*SetColorMapEntriesMessage) Type() uint8 {
return 1
}
func (*SetColorMapEntriesMessage) Read(c *ClientConn, r io.Reader) (ServerMessage, error) {
// Read off the padding
var padding [1]byte
if _, err := io.ReadFull(r, padding[:]); err != nil {
return nil, err
}
var result SetColorMapEntriesMessage
if err := binary.Read(r, binary.BigEndian, &result.FirstColor); err != nil {
return nil, err
}
var numColors uint16
if err := binary.Read(r, binary.BigEndian, &numColors); err != nil {
return nil, err
}
result.Colors = make([]Color, numColors)
for i := uint16(0); i < numColors; i++ {
color := &result.Colors[i]
data := []interface{}{
&color.R,
&color.G,
&color.B,
}
for _, val := range data {
if err := binary.Read(r, binary.BigEndian, val); err != nil {
return nil, err
}
}
// Update the connection's color map
c.ColorMap[result.FirstColor+i] = *color
}
return &result, nil
}
// Bell signals that an audible bell should be made on the client.
//
// See RFC 6143 Section 7.6.3
type BellMessage byte
func (*BellMessage) Type() uint8 {
return 2
}
func (*BellMessage) Read(*ClientConn, io.Reader) (ServerMessage, error) {
return new(BellMessage), nil
}
// ServerCutTextMessage indicates the server has new text in the cut buffer.
//
// See RFC 6143 Section 7.6.4
type ServerCutTextMessage struct {
Text string
}
func (*ServerCutTextMessage) Type() uint8 {
return 3
}
func (*ServerCutTextMessage) Read(c *ClientConn, r io.Reader) (ServerMessage, error) {
// Read off the padding
var padding [1]byte
if _, err := io.ReadFull(r, padding[:]); err != nil {
return nil, err
}
var textLength uint32
if err := binary.Read(r, binary.BigEndian, &textLength); err != nil {
return nil, err
}
textBytes := make([]uint8, textLength)
if err := binary.Read(r, binary.BigEndian, &textBytes); err != nil {
return nil, err
}
return &ServerCutTextMessage{string(textBytes)}, nil
}
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