added basic code128 support

code128/bencoder.go

@@ -0,0 +1,21 @@
+package code128
+
+import (
+	"github.com/boombuler/barcode/utils"
+	"strings"
+)
+
+const bTable = " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
+
+func encodeBTable(content []rune) *utils.BitList {
+	result := new(utils.BitList)
+	result.AddByte(startBSymbol)
+	for _, r := range content {
+		idx := strings.IndexRune(bTable, r)
+		if idx < 0 {
+			return nil
+		}
+		result.AddByte(byte(idx))
+	}
+	return result
+}

code128/code.go

@@ -0,0 +1,36 @@
+package code128
+
+import (
+	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/utils"
+	"image"
+	"image/color"
+)
+
+type code struct {
+	*utils.BitList
+	content string
+}
+
+func (c *code) Content() string {
+	return c.content
+}
+
+func (c *code) Metadata() barcode.Metadata {
+	return barcode.Metadata{"Code 128", 1}
+}
+
+func (c *code) ColorModel() color.Model {
+	return color.Gray16Model
+}
+
+func (c *code) Bounds() image.Rectangle {
+	return image.Rect(0, 0, c.Len(), 1)
+}
+
+func (c *code) At(x, y int) color.Color {
+	if c.GetBit(x) {
+		return color.Black
+	}
+	return color.White
+}

code128/encode.go

@@ -0,0 +1,41 @@
+package code128
+
+import (
+	"fmt"
+	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/utils"
+	"unicode/utf8"
+)
+
+func strToRunes(str string) []rune {
+	result := make([]rune, utf8.RuneCountInString(str))
+	i := 0
+	for _, r := range str {
+		result[i] = r
+		i++
+	}
+	return result
+}
+
+func Encode(content string) (barcode.Barcode, error) {
+	contentRunes := strToRunes(content)
+	idxList := encodeBTable(contentRunes)
+
+	if idxList == nil {
+		return nil, fmt.Errorf("\"%s\" could not be encoded", content)
+	}
+
+	result := &code{new(utils.BitList), content}
+	sum := 0
+	for i, idx := range idxList.GetBytes() {
+		if i == 0 {
+			sum = int(idx)
+		} else {
+			sum += i * int(idx)
+		}
+		result.AddRange(encodingTable[idx])
+	}
+	result.AddRange(encodingTable[sum%103])
+	result.AddRange(encodingTable[stopSymbol])
+	return result, nil
+}

code128/encodingtable.go

@@ -0,0 +1,116 @@
+package code128
+
+var encodingTable [107][]bool = [107][]bool{
+	[]bool{true, true, false, true, true, false, false, true, true, false, false},
+	[]bool{true, true, false, false, true, true, false, true, true, false, false},
+	[]bool{true, true, false, false, true, true, false, false, true, true, false},
+	[]bool{true, false, false, true, false, false, true, true, false, false, false},
+	[]bool{true, false, false, true, false, false, false, true, true, false, false},
+	[]bool{true, false, false, false, true, false, false, true, true, false, false},
+	[]bool{true, false, false, true, true, false, false, true, false, false, false},
+	[]bool{true, false, false, true, true, false, false, false, true, false, false},
+	[]bool{true, false, false, false, true, true, false, false, true, false, false},
+	[]bool{true, true, false, false, true, false, false, true, false, false, false},
+	[]bool{true, true, false, false, true, false, false, false, true, false, false},
+	[]bool{true, true, false, false, false, true, false, false, true, false, false},
+	[]bool{true, false, true, true, false, false, true, true, true, false, false},
+	[]bool{true, false, false, true, true, false, true, true, true, false, false},
+	[]bool{true, false, false, true, true, false, false, true, true, true, false},
+	[]bool{true, false, true, true, true, false, false, true, true, false, false},
+	[]bool{true, false, false, true, true, true, false, true, true, false, false},
+	[]bool{true, false, false, true, true, true, false, false, true, true, false},
+	[]bool{true, true, false, false, true, true, true, false, false, true, false},
+	[]bool{true, true, false, false, true, false, true, true, true, false, false},
+	[]bool{true, true, false, false, true, false, false, true, true, true, false},
+	[]bool{true, true, false, true, true, true, false, false, true, false, false},
+	[]bool{true, true, false, false, true, true, true, false, true, false, false},
+	[]bool{true, true, true, false, true, true, false, true, true, true, false},
+	[]bool{true, true, true, false, true, false, false, true, true, false, false},
+	[]bool{true, true, true, false, false, true, false, true, true, false, false},
+	[]bool{true, true, true, false, false, true, false, false, true, true, false},
+	[]bool{true, true, true, false, true, true, false, false, true, false, false},
+	[]bool{true, true, true, false, false, true, true, false, true, false, false},
+	[]bool{true, true, true, false, false, true, true, false, false, true, false},
+	[]bool{true, true, false, true, true, false, true, true, false, false, false},
+	[]bool{true, true, false, true, true, false, false, false, true, true, false},
+	[]bool{true, true, false, false, false, true, true, false, true, true, false},
+	[]bool{true, false, true, false, false, false, true, true, false, false, false},
+	[]bool{true, false, false, false, true, false, true, true, false, false, false},
+	[]bool{true, false, false, false, true, false, false, false, true, true, false},
+	[]bool{true, false, true, true, false, false, false, true, false, false, false},
+	[]bool{true, false, false, false, true, true, false, true, false, false, false},
+	[]bool{true, false, false, false, true, true, false, false, false, true, false},
+	[]bool{true, true, false, true, false, false, false, true, false, false, false},
+	[]bool{true, true, false, false, false, true, false, true, false, false, false},
+	[]bool{true, true, false, false, false, true, false, false, false, true, false},
+	[]bool{true, false, true, true, false, true, true, true, false, false, false},
+	[]bool{true, false, true, true, false, false, false, true, true, true, false},
+	[]bool{true, false, false, false, true, true, false, true, true, true, false},
+	[]bool{true, false, true, true, true, false, true, true, false, false, false},
+	[]bool{true, false, true, true, true, false, false, false, true, true, false},
+	[]bool{true, false, false, false, true, true, true, false, true, true, false},
+	[]bool{true, true, true, false, true, true, true, false, true, true, false},
+	[]bool{true, true, false, true, false, false, false, true, true, true, false},
+	[]bool{true, true, false, false, false, true, false, true, true, true, false},
+	[]bool{true, true, false, true, true, true, false, true, false, false, false},
+	[]bool{true, true, false, true, true, true, false, false, false, true, false},
+	[]bool{true, true, false, true, true, true, false, true, true, true, false},
+	[]bool{true, true, true, false, true, false, true, true, false, false, false},
+	[]bool{true, true, true, false, true, false, false, false, true, true, false},
+	[]bool{true, true, true, false, false, false, true, false, true, true, false},
+	[]bool{true, true, true, false, true, true, false, true, false, false, false},
+	[]bool{true, true, true, false, true, true, false, false, false, true, false},
+	[]bool{true, true, true, false, false, false, true, true, false, true, false},
+	[]bool{true, true, true, false, true, true, true, true, false, true, false},
+	[]bool{true, true, false, false, true, false, false, false, false, true, false},
+	[]bool{true, true, true, true, false, false, false, true, false, true, false},
+	[]bool{true, false, true, false, false, true, true, false, false, false, false},
+	[]bool{true, false, true, false, false, false, false, true, true, false, false},
+	[]bool{true, false, false, true, false, true, true, false, false, false, false},
+	[]bool{true, false, false, true, false, false, false, false, true, true, false},
+	[]bool{true, false, false, false, false, true, false, true, true, false, false},
+	[]bool{true, false, false, false, false, true, false, false, true, true, false},
+	[]bool{true, false, true, true, false, false, true, false, false, false, false},
+	[]bool{true, false, true, true, false, false, false, false, true, false, false},
+	[]bool{true, false, false, true, true, false, true, false, false, false, false},
+	[]bool{true, false, false, true, true, false, false, false, false, true, false},
+	[]bool{true, false, false, false, false, true, true, false, true, false, false},
+	[]bool{true, false, false, false, false, true, true, false, false, true, false},
+	[]bool{true, true, false, false, false, false, true, false, false, true, false},
+	[]bool{true, true, false, false, true, false, true, false, false, false, false},
+	[]bool{true, true, true, true, false, true, true, true, false, true, false},
+	[]bool{true, true, false, false, false, false, true, false, true, false, false},
+	[]bool{true, false, false, false, true, true, true, true, false, true, false},
+	[]bool{true, false, true, false, false, true, true, true, true, false, false},
+	[]bool{true, false, false, true, false, true, true, true, true, false, false},
+	[]bool{true, false, false, true, false, false, true, true, true, true, false},
+	[]bool{true, false, true, true, true, true, false, false, true, false, false},
+	[]bool{true, false, false, true, true, true, true, false, true, false, false},
+	[]bool{true, false, false, true, true, true, true, false, false, true, false},
+	[]bool{true, true, true, true, false, true, false, false, true, false, false},
+	[]bool{true, true, true, true, false, false, true, false, true, false, false},
+	[]bool{true, true, true, true, false, false, true, false, false, true, false},
+	[]bool{true, true, false, true, true, false, true, true, true, true, false},
+	[]bool{true, true, false, true, true, true, true, false, true, true, false},
+	[]bool{true, true, true, true, false, true, true, false, true, true, false},
+	[]bool{true, false, true, false, true, true, true, true, false, false, false},
+	[]bool{true, false, true, false, false, false, true, true, true, true, false},
+	[]bool{true, false, false, false, true, false, true, true, true, true, false},
+	[]bool{true, false, true, true, true, true, false, true, false, false, false},
+	[]bool{true, false, true, true, true, true, false, false, false, true, false},
+	[]bool{true, true, true, true, false, true, false, true, false, false, false},
+	[]bool{true, true, true, true, false, true, false, false, false, true, false},
+	[]bool{true, false, true, true, true, false, true, true, true, true, false},
+	[]bool{true, false, true, true, true, true, false, true, true, true, false},
+	[]bool{true, true, true, false, true, false, true, true, true, true, false},
+	[]bool{true, true, true, true, false, true, false, true, true, true, false},
+	[]bool{true, true, false, true, false, false, false, false, true, false, false},
+	[]bool{true, true, false, true, false, false, true, false, false, false, false},
+	[]bool{true, true, false, true, false, false, true, true, true, false, false},
+	[]bool{true, true, false, false, false, true, true, true, false, true, false, true, true},
+}
+
+const startASymbol byte = 103
+const startBSymbol byte = 104
+const startCSymbol byte = 105
+const stopSymbol byte = 106

utils/bitlist.go

@@ -79,6 +79,13 @@ func (bl *BitList) AddBits(b int, count byte) {
 	}
 }
 
+// appends all bits in the bool-slice to the end of the list
+func (bl *BitList) AddRange(bits []bool) {
+	for _, b := range bits {
+		bl.AddBit(b)
+	}
+}
+
 // returns all bits of the BitList as a []byte
 func (bl *BitList) GetBytes() []byte {
 	len := bl.count >> 3