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high_level_encoder.go
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high_level_encoder.go
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package encoder
import (
"math"
"strings"
"github.com/kaxap/gozxing"
)
// DataMatrix ECC 200 data encoder following the algorithm described in ISO/IEC 16022:200(E) in annex S.
const (
// Padding character
HighLevelEncoder_PAD = 129
// mode latch to C40 encodation mode
HighLevelEncoder_LATCH_TO_C40 = 230
// mode latch to Base 256 encodation mode
HighLevelEncoder_LATCH_TO_BASE256 = 231
// FNC1 Codeword
// HighLevelEncoder_FUNC1 = 232
// Structured Append Codeword
// HighLevelEncoder_STRUCTURED_APPEND = 233
// Reader Programming
// HighLevelEncoder_READER_PROGRAMMING = 234
// Upper Shift
HighLevelEncoder_UPPER_SHIFT = 235
// 05 Macro
HighLevelEncoder_MACRO_05 = 236
// 06 Macro
HighLevelEncoder_MACRO_06 = 237
// mode latch to ANSI X.12 encodation mode
HighLevelEncoder_LATCH_TO_ANSIX12 = 238
// mode latch to Text encodation mode
HighLevelEncoder_LATCH_TO_TEXT = 239
// mode latch to EDIFACT encodation mode
HighLevelEncoder_LATCH_TO_EDIFACT = 240
// ECI character (Extended Channel Interpretation)
// HighLevelEncoder_ECI = 241
// Unlatch from C40 encodation
HighLevelEncoder_C40_UNLATCH = 254
// Unlatch from X12 encodation
HighLevelEncoder_X12_UNLATCH = 254
// 05 Macro header
HighLevelEncoder_MACRO_05_HEADER = "[)>\u001E05\u001D"
// 06 Macro header
HighLevelEncoder_MACRO_06_HEADER = "[)>\u001E06\u001D"
// Macro trailer
HighLevelEncoder_MACRO_TRAILER = "\u001E\u0004"
HighLevelEncoder_ASCII_ENCODATION = 0
HighLevelEncoder_C40_ENCODATION = 1
HighLevelEncoder_TEXT_ENCODATION = 2
HighLevelEncoder_X12_ENCODATION = 3
HighLevelEncoder_EDIFACT_ENCODATION = 4
HighLevelEncoder_BASE256_ENCODATION = 5
)
// Converts the message to a byte array using the default encoding (cp437) as defined by the
// specification
//
// @param msg the message
// @return the byte array of the message
//
/*
func HighLevelEncoder_getBytesForMessage(msg string) ([]byte, error) {
//See 4.4.3 and annex B of ISO/IEC 15438:2001(E)
return charmap.CodePage437.NewEncoder().Bytes([]byte(msg))
}
*/
func randomize253State(ch byte, codewordPosition int) byte {
pseudoRandom := ((149 * codewordPosition) % 253) + 1
tempVariable := int(ch) + pseudoRandom
if tempVariable <= 254 {
return byte(tempVariable)
}
return byte(tempVariable - 254)
}
// EncodeHighLevel Performs message encoding of a DataMatrix message using the
// algorithm described in annex P of ISO/IEC 16022:2000(E).
//
// @param msg the message
// @param shape requested shape. May be {@code SymbolShapeHint.FORCE_NONE},
// {@code SymbolShapeHint.FORCE_SQUARE} or {@code SymbolShapeHint.FORCE_RECTANGLE}.
// @param minSize the minimum symbol size constraint or null for no constraint
// @param maxSize the maximum symbol size constraint or null for no constraint
// @return the encoded message (the char values range from 0 to 255)
//
func EncodeHighLevel(msg string, shape SymbolShapeHint, minSize, maxSize *gozxing.Dimension) ([]byte, error) {
//the codewords 0..255 are encoded as Unicode characters
encoders := []Encoder{
NewASCIIEncoder(), NewC40Encoder(), NewTextEncoder(),
NewX12Encoder(), NewEdifactEncoder(), NewBase256Encoder(),
}
context, _ := NewEncoderContext(msg)
context.SetSymbolShape(shape)
context.SetSizeConstraints(minSize, maxSize)
if strings.HasPrefix(msg, HighLevelEncoder_MACRO_05_HEADER) &&
strings.HasSuffix(msg, HighLevelEncoder_MACRO_TRAILER) {
context.WriteCodeword(HighLevelEncoder_MACRO_05)
context.SetSkipAtEnd(2)
context.pos += len(HighLevelEncoder_MACRO_05_HEADER)
} else if strings.HasPrefix(msg, HighLevelEncoder_MACRO_06_HEADER) &&
strings.HasSuffix(msg, HighLevelEncoder_MACRO_TRAILER) {
context.WriteCodeword(HighLevelEncoder_MACRO_06)
context.SetSkipAtEnd(2)
context.pos += len(HighLevelEncoder_MACRO_06_HEADER)
}
encodingMode := HighLevelEncoder_ASCII_ENCODATION //Default mode
for context.HasMoreCharacters() {
encoders[encodingMode].encode(context)
if context.GetNewEncoding() >= 0 {
encodingMode = context.GetNewEncoding()
context.ResetEncoderSignal()
}
}
length := context.GetCodewordCount()
e := context.UpdateSymbolInfo()
if e != nil {
return nil, gozxing.WrapWriterException(e)
}
capacity := context.GetSymbolInfo().GetDataCapacity()
if length < capacity &&
encodingMode != HighLevelEncoder_ASCII_ENCODATION &&
encodingMode != HighLevelEncoder_BASE256_ENCODATION &&
encodingMode != HighLevelEncoder_EDIFACT_ENCODATION {
context.WriteCodeword(0xfe) //Unlatch (254)
}
//Padding
codewords := context.GetCodewords()
if len(codewords) < capacity {
codewords = append(codewords, HighLevelEncoder_PAD)
}
for len(codewords) < capacity {
codewords = append(codewords, randomize253State(HighLevelEncoder_PAD, len(codewords)+1))
}
context.codewords = codewords
return context.GetCodewords(), nil
}
func HighLevelEncoder_lookAheadTest(msg []byte, startpos, currentMode int) int {
if startpos >= len(msg) {
return currentMode
}
var charCounts []float64
//step J
if currentMode == HighLevelEncoder_ASCII_ENCODATION {
charCounts = []float64{0, 1, 1, 1, 1, 1.25}
} else {
charCounts = []float64{1, 2, 2, 2, 2, 2.25}
charCounts[currentMode] = 0
}
charsProcessed := 0
for {
//step K
if (startpos + charsProcessed) == len(msg) {
min := math.MaxInt32
mins := make([]byte, 6)
intCharCounts := make([]int, 6)
min = findMinimums(charCounts, intCharCounts, min, mins)
minCount := getMinimumCount(mins)
if intCharCounts[HighLevelEncoder_ASCII_ENCODATION] == min {
return HighLevelEncoder_ASCII_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_BASE256_ENCODATION] > 0 {
return HighLevelEncoder_BASE256_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_EDIFACT_ENCODATION] > 0 {
return HighLevelEncoder_EDIFACT_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_TEXT_ENCODATION] > 0 {
return HighLevelEncoder_TEXT_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_X12_ENCODATION] > 0 {
return HighLevelEncoder_X12_ENCODATION
}
return HighLevelEncoder_C40_ENCODATION
}
c := msg[startpos+charsProcessed]
charsProcessed++
//step L
if HighLevelEncoder_isDigit(c) {
charCounts[HighLevelEncoder_ASCII_ENCODATION] += 0.5
} else if HighLevelEncoder_isExtendedASCII(c) {
charCounts[HighLevelEncoder_ASCII_ENCODATION] =
math.Ceil(charCounts[HighLevelEncoder_ASCII_ENCODATION])
charCounts[HighLevelEncoder_ASCII_ENCODATION] += 2.0
} else {
charCounts[HighLevelEncoder_ASCII_ENCODATION] =
math.Ceil(charCounts[HighLevelEncoder_ASCII_ENCODATION])
charCounts[HighLevelEncoder_ASCII_ENCODATION]++
}
//step M
if isNativeC40(c) {
charCounts[HighLevelEncoder_C40_ENCODATION] += 2.0 / 3.0
} else if HighLevelEncoder_isExtendedASCII(c) {
charCounts[HighLevelEncoder_C40_ENCODATION] += 8.0 / 3.0
} else {
charCounts[HighLevelEncoder_C40_ENCODATION] += 4.0 / 3.0
}
//step N
if isNativeText(c) {
charCounts[HighLevelEncoder_TEXT_ENCODATION] += 2.0 / 3.0
} else if HighLevelEncoder_isExtendedASCII(c) {
charCounts[HighLevelEncoder_TEXT_ENCODATION] += 8.0 / 3.0
} else {
charCounts[HighLevelEncoder_TEXT_ENCODATION] += 4.0 / 3.0
}
//step O
if isNativeX12(c) {
charCounts[HighLevelEncoder_X12_ENCODATION] += 2.0 / 3.0
} else if HighLevelEncoder_isExtendedASCII(c) {
charCounts[HighLevelEncoder_X12_ENCODATION] += 13.0 / 3.0
} else {
charCounts[HighLevelEncoder_X12_ENCODATION] += 10.0 / 3.0
}
//step P
if isNativeEDIFACT(c) {
charCounts[HighLevelEncoder_EDIFACT_ENCODATION] += 3.0 / 4.0
} else if HighLevelEncoder_isExtendedASCII(c) {
charCounts[HighLevelEncoder_EDIFACT_ENCODATION] += 17.0 / 4.0
} else {
charCounts[HighLevelEncoder_EDIFACT_ENCODATION] += 13.0 / 4.0
}
// step Q
if isSpecialB256(c) {
charCounts[HighLevelEncoder_BASE256_ENCODATION] += 4.0
} else {
charCounts[HighLevelEncoder_BASE256_ENCODATION]++
}
//step R
if charsProcessed >= 4 {
intCharCounts := make([]int, 6)
mins := make([]byte, 6)
findMinimums(charCounts, intCharCounts, math.MaxInt32, mins)
minCount := getMinimumCount(mins)
if intCharCounts[HighLevelEncoder_ASCII_ENCODATION] < intCharCounts[HighLevelEncoder_BASE256_ENCODATION] &&
intCharCounts[HighLevelEncoder_ASCII_ENCODATION] < intCharCounts[HighLevelEncoder_C40_ENCODATION] &&
intCharCounts[HighLevelEncoder_ASCII_ENCODATION] < intCharCounts[HighLevelEncoder_TEXT_ENCODATION] &&
intCharCounts[HighLevelEncoder_ASCII_ENCODATION] < intCharCounts[HighLevelEncoder_X12_ENCODATION] &&
intCharCounts[HighLevelEncoder_ASCII_ENCODATION] < intCharCounts[HighLevelEncoder_EDIFACT_ENCODATION] {
return HighLevelEncoder_ASCII_ENCODATION
}
if intCharCounts[HighLevelEncoder_BASE256_ENCODATION] < intCharCounts[HighLevelEncoder_ASCII_ENCODATION] ||
(mins[HighLevelEncoder_C40_ENCODATION]+mins[HighLevelEncoder_TEXT_ENCODATION]+mins[HighLevelEncoder_X12_ENCODATION]+mins[HighLevelEncoder_EDIFACT_ENCODATION]) == 0 {
return HighLevelEncoder_BASE256_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_EDIFACT_ENCODATION] > 0 {
return HighLevelEncoder_EDIFACT_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_TEXT_ENCODATION] > 0 {
return HighLevelEncoder_TEXT_ENCODATION
}
if minCount == 1 && mins[HighLevelEncoder_X12_ENCODATION] > 0 {
return HighLevelEncoder_X12_ENCODATION
}
if intCharCounts[HighLevelEncoder_C40_ENCODATION]+1 < intCharCounts[HighLevelEncoder_ASCII_ENCODATION] &&
intCharCounts[HighLevelEncoder_C40_ENCODATION]+1 < intCharCounts[HighLevelEncoder_BASE256_ENCODATION] &&
intCharCounts[HighLevelEncoder_C40_ENCODATION]+1 < intCharCounts[HighLevelEncoder_EDIFACT_ENCODATION] &&
intCharCounts[HighLevelEncoder_C40_ENCODATION]+1 < intCharCounts[HighLevelEncoder_TEXT_ENCODATION] {
if intCharCounts[HighLevelEncoder_C40_ENCODATION] < intCharCounts[HighLevelEncoder_X12_ENCODATION] {
return HighLevelEncoder_C40_ENCODATION
}
if intCharCounts[HighLevelEncoder_C40_ENCODATION] == intCharCounts[HighLevelEncoder_X12_ENCODATION] {
p := startpos + charsProcessed + 1
for p < len(msg) {
tc := msg[p]
if isX12TermSep(tc) {
return HighLevelEncoder_X12_ENCODATION
}
if !isNativeX12(tc) {
break
}
p++
}
return HighLevelEncoder_C40_ENCODATION
}
}
}
}
}
func findMinimums(charCounts []float64, intCharCounts []int, min int, mins []byte) int {
for i := range mins {
mins[i] = 0
}
for i := 0; i < 6; i++ {
intCharCounts[i] = int(math.Ceil(charCounts[i]))
current := intCharCounts[i]
if min > current {
min = current
for j := range mins {
mins[j] = 0
}
}
if min == current {
mins[i]++
}
}
return min
}
func getMinimumCount(mins []byte) int {
minCount := 0
for i := 0; i < 6; i++ {
minCount += int(mins[i])
}
return minCount
}
func HighLevelEncoder_isDigit(ch byte) bool {
return ch >= '0' && ch <= '9'
}
func HighLevelEncoder_isExtendedASCII(ch byte) bool {
return ch >= 128 && ch <= 255
}
func isNativeC40(ch byte) bool {
return (ch == ' ') || (ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z')
}
func isNativeText(ch byte) bool {
return (ch == ' ') || (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'z')
}
func isNativeX12(ch byte) bool {
return isX12TermSep(ch) || (ch == ' ') || (ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z')
}
func isX12TermSep(ch byte) bool {
return (ch == '\r') || //CR
(ch == '*') ||
(ch == '>')
}
func isNativeEDIFACT(ch byte) bool {
return ch >= ' ' && ch <= '^'
}
func isSpecialB256(ch byte) bool {
return false //TODO NOT IMPLEMENTED YET!!!
}
// determineConsecutiveDigitCount Determines the number of consecutive characters that are encodable using numeric compaction.
//
// @param msg the message
// @param startpos the start position within the message
// @return the requested character count
//
func HighLevelEncoder_determineConsecutiveDigitCount(msg []byte, startpos int) int {
count := 0
len := len(msg)
idx := startpos
if idx < len {
ch := msg[idx]
for HighLevelEncoder_isDigit(ch) && idx < len {
count++
idx++
if idx < len {
ch = msg[idx]
}
}
}
return count
}