/usr/share/gocode/src/rsc.io/qr/libqrencode/qrencode.go is in golang-rsc-qr-dev 0.0~git20161121.48b2ede-1.
This file is owned by root:root, with mode 0o644.
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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 | // Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package libqrencode wraps the C libqrencode library.
// The qr package (in this package's parent directory)
// does not use any C wrapping. This code is here only
// for use during that package's tests.
package libqrencode
/*
#cgo LDFLAGS: -lqrencode
#include <qrencode.h>
*/
import "C"
import (
"fmt"
"image"
"image/color"
"unsafe"
)
type Version int
type Mode int
const (
Numeric Mode = C.QR_MODE_NUM
Alphanumeric Mode = C.QR_MODE_AN
EightBit Mode = C.QR_MODE_8
)
type Level int
const (
L Level = C.QR_ECLEVEL_L
M Level = C.QR_ECLEVEL_M
Q Level = C.QR_ECLEVEL_Q
H Level = C.QR_ECLEVEL_H
)
type Pixel int
const (
Black Pixel = 1 << iota
DataECC
Format
PVersion
Timing
Alignment
Finder
NonData
)
type Code struct {
Version int
Width int
Pixel [][]Pixel
Scale int
}
func (*Code) ColorModel() color.Model {
return color.RGBAModel
}
func (c *Code) Bounds() image.Rectangle {
d := (c.Width + 8) * c.Scale
return image.Rect(0, 0, d, d)
}
var (
white color.Color = color.RGBA{0xFF, 0xFF, 0xFF, 0xFF}
black color.Color = color.RGBA{0x00, 0x00, 0x00, 0xFF}
blue color.Color = color.RGBA{0x00, 0x00, 0x80, 0xFF}
red color.Color = color.RGBA{0xFF, 0x40, 0x40, 0xFF}
yellow color.Color = color.RGBA{0xFF, 0xFF, 0x00, 0xFF}
gray color.Color = color.RGBA{0x80, 0x80, 0x80, 0xFF}
green color.Color = color.RGBA{0x22, 0x8B, 0x22, 0xFF}
)
func (c *Code) At(x, y int) color.Color {
x = x/c.Scale - 4
y = y/c.Scale - 4
if 0 <= x && x < c.Width && 0 <= y && y < c.Width {
switch p := c.Pixel[y][x]; {
case p&Black == 0:
// nothing
case p&DataECC != 0:
return black
case p&Format != 0:
return blue
case p&PVersion != 0:
return red
case p&Timing != 0:
return yellow
case p&Alignment != 0:
return gray
case p&Finder != 0:
return green
}
}
return white
}
type Chunk struct {
Mode Mode
Text string
}
func Encode(version Version, level Level, mode Mode, text string) (*Code, error) {
return EncodeChunk(version, level, Chunk{mode, text})
}
func EncodeChunk(version Version, level Level, chunk ...Chunk) (*Code, error) {
qi, err := C.QRinput_new2(C.int(version), C.QRecLevel(level))
if qi == nil {
return nil, fmt.Errorf("QRinput_new2: %v", err)
}
defer C.QRinput_free(qi)
for _, ch := range chunk {
data := []byte(ch.Text)
n, err := C.QRinput_append(qi, C.QRencodeMode(ch.Mode), C.int(len(data)), (*C.uchar)(&data[0]))
if n < 0 {
return nil, fmt.Errorf("QRinput_append %q: %v", data, err)
}
}
qc, err := C.QRcode_encodeInput(qi)
if qc == nil {
return nil, fmt.Errorf("QRinput_encodeInput: %v", err)
}
c := &Code{
Version: int(qc.version),
Width: int(qc.width),
Scale: 16,
}
pix := make([]Pixel, c.Width*c.Width)
cdat := (*[1000 * 1000]byte)(unsafe.Pointer(qc.data))[:len(pix)]
for i := range pix {
pix[i] = Pixel(cdat[i])
}
c.Pixel = make([][]Pixel, c.Width)
for i := range c.Pixel {
c.Pixel[i] = pix[i*c.Width : (i+1)*c.Width]
}
return c, nil
}
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