76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package aztec
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import (
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"fmt"
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"github.com/boombuler/barcode/utils"
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)
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type token interface {
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fmt.Stringer
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prev() token
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appendTo(bits *utils.BitList, text []byte)
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}
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type simpleToken struct {
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token
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value int
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bitCount byte
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}
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type binaryShiftToken struct {
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token
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bShiftStart int
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bShiftByteCnt int
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}
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func newSimpleToken(prev token, value int, bitCount byte) token {
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return &simpleToken{prev, value, bitCount}
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}
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func newShiftToken(prev token, bShiftStart int, bShiftCnt int) token {
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return &binaryShiftToken{prev, bShiftStart, bShiftCnt}
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}
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func (st *simpleToken) prev() token {
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return st.token
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}
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func (st *simpleToken) appendTo(bits *utils.BitList, text []byte) {
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bits.AddBits(st.value, st.bitCount)
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}
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func (st *simpleToken) String() string {
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value := st.value & ((1 << st.bitCount) - 1)
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value |= 1 << st.bitCount
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return "<" + fmt.Sprintf("%b", value)[1:] + ">"
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}
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func (bst *binaryShiftToken) prev() token {
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return bst.token
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}
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func (bst *binaryShiftToken) appendTo(bits *utils.BitList, text []byte) {
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for i := 0; i < bst.bShiftByteCnt; i++ {
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if i == 0 || (i == 31 && bst.bShiftByteCnt <= 62) {
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// We need a header before the first character, and before
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// character 31 when the total byte code is <= 62
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bits.AddBits(31, 5) // BINARY_SHIFT
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if bst.bShiftByteCnt > 62 {
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bits.AddBits(bst.bShiftByteCnt-31, 16)
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} else if i == 0 {
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// 1 <= binaryShiftByteCode <= 62
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if bst.bShiftByteCnt < 31 {
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bits.AddBits(bst.bShiftByteCnt, 5)
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} else {
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bits.AddBits(31, 5)
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}
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} else {
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// 32 <= binaryShiftCount <= 62 and i == 31
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bits.AddBits(bst.bShiftByteCnt-31, 5)
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}
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}
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bits.AddByte(text[bst.bShiftStart+i])
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}
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}
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func (bst *binaryShiftToken) String() string {
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return fmt.Sprintf("<%d::%d>", bst.bShiftStart, (bst.bShiftStart + bst.bShiftByteCnt - 1))
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}
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