/usr/share/gocode/src/github.com/mitchellh/go-vnc/pixel_format.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 | package vnc
import (
"bytes"
"encoding/binary"
"io"
)
// PixelFormat describes the way a pixel is formatted for a VNC connection.
//
// See RFC 6143 Section 7.4 for information on each of the fields.
type PixelFormat struct {
BPP uint8
Depth uint8
BigEndian bool
TrueColor bool
RedMax uint16
GreenMax uint16
BlueMax uint16
RedShift uint8
GreenShift uint8
BlueShift uint8
}
func readPixelFormat(r io.Reader, result *PixelFormat) error {
var rawPixelFormat [16]byte
if _, err := io.ReadFull(r, rawPixelFormat[:]); err != nil {
return err
}
var pfBoolByte uint8
brPF := bytes.NewReader(rawPixelFormat[:])
if err := binary.Read(brPF, binary.BigEndian, &result.BPP); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &result.Depth); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &pfBoolByte); err != nil {
return err
}
if pfBoolByte != 0 {
// Big endian is true
result.BigEndian = true
}
if err := binary.Read(brPF, binary.BigEndian, &pfBoolByte); err != nil {
return err
}
if pfBoolByte != 0 {
// True Color is true. So we also have to read all the color max & shifts.
result.TrueColor = true
if err := binary.Read(brPF, binary.BigEndian, &result.RedMax); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &result.GreenMax); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &result.BlueMax); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &result.RedShift); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &result.GreenShift); err != nil {
return err
}
if err := binary.Read(brPF, binary.BigEndian, &result.BlueShift); err != nil {
return err
}
}
return nil
}
func writePixelFormat(format *PixelFormat) ([]byte, error) {
var buf bytes.Buffer
// Byte 1
if err := binary.Write(&buf, binary.BigEndian, format.BPP); err != nil {
return nil, err
}
// Byte 2
if err := binary.Write(&buf, binary.BigEndian, format.Depth); err != nil {
return nil, err
}
var boolByte byte
if format.BigEndian {
boolByte = 1
} else {
boolByte = 0
}
// Byte 3 (BigEndian)
if err := binary.Write(&buf, binary.BigEndian, boolByte); err != nil {
return nil, err
}
if format.TrueColor {
boolByte = 1
} else {
boolByte = 0
}
// Byte 4 (TrueColor)
if err := binary.Write(&buf, binary.BigEndian, boolByte); err != nil {
return nil, err
}
// If we have true color enabled then we have to fill in the rest of the
// structure with the color values.
if format.TrueColor {
if err := binary.Write(&buf, binary.BigEndian, format.RedMax); err != nil {
return nil, err
}
if err := binary.Write(&buf, binary.BigEndian, format.GreenMax); err != nil {
return nil, err
}
if err := binary.Write(&buf, binary.BigEndian, format.BlueMax); err != nil {
return nil, err
}
if err := binary.Write(&buf, binary.BigEndian, format.RedShift); err != nil {
return nil, err
}
if err := binary.Write(&buf, binary.BigEndian, format.GreenShift); err != nil {
return nil, err
}
if err := binary.Write(&buf, binary.BigEndian, format.BlueShift); err != nil {
return nil, err
}
}
return buf.Bytes()[0:16], nil
}
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