Added full support for UTF-8 font. With MIT license.

1 files changed, 1124 insertions, 0 deletions

diff --git a/utf8fontfile.go b/utf8fontfile.go
new file mode 100644
index 0000000..ad9f924
--- /dev/null
+++ b/utf8fontfile.go
@@ -0,0 +1,1124 @@
+package gofpdf
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"math"
+	"sort"
+)
+
+// flags
+const symbolWords = 1 << 0
+const symbolScale = 1 << 3
+const symbolContinue = 1 << 5
+const symbolAllScale = 1 << 6
+const symbol2x2 = 1 << 7
+const toUnicode = "/CIDInit /ProcSet findresource begin\n12 dict begin\nbegincmap\n/CIDSystemInfo\n<</Registry (Adobe)\n/Ordering (UCS)\n/Supplement 0\n>> def\n/CMapName /Adobe-Identity-UCS def\n/CMapType 2 def\n1 begincodespacerange\n<0000> <FFFF>\nendcodespacerange\n1 beginbfrange\n<0000> <FFFF> <0000>\nendbfrange\nendcmap\nCMapName currentdict /CMap defineresource pop\nend\nend"
+
+type utf8FontFile struct {
+	fileReader           *fileReader
+	LastRune             int
+	tableDescriptions    map[string]*tableDescription
+	outTablesData        map[string][]byte
+	symbolPosition       []int
+	charSymbolDictionary map[int]int
+	Ascent               int
+	Descent              int
+	fontElementSize      int
+	Bbox                 fontBoxType
+	CapHeight            int
+	StemV                int
+	ItalicAngle          int
+	Flags                int
+	UnderlinePosition    float64
+	UnderlineThickness   float64
+	CharWidths           []int
+	DefaultWidth         float64
+	symbolData           map[int]map[string][]int
+	CodeSymbolDictionary map[int]int
+}
+
+type tableDescription struct {
+	name     string
+	checksum []int
+	position int
+	size     int
+}
+
+type fileReader struct {
+	readerPosition int64
+	array          []byte
+}
+
+func (fr *fileReader) Read(s int) []byte {
+	b := fr.array[fr.readerPosition : fr.readerPosition+int64(s)]
+	fr.readerPosition += int64(s)
+	return b
+}
+
+func (fr *fileReader) seek(shift int64, flag int) (int64, error) {
+	if flag == 0 {
+		fr.readerPosition = shift
+	} else if flag == 1 {
+		fr.readerPosition += shift
+	} else if flag == 2 {
+		fr.readerPosition = int64(len(fr.array)) - shift
+	}
+	return int64(fr.readerPosition), nil
+}
+
+func newUTF8Font(reader *fileReader) *utf8FontFile {
+	utf := utf8FontFile{
+		fileReader: reader,
+	}
+	return &utf
+}
+
+func (utf *utf8FontFile) parseFile() error {
+	utf.fileReader.readerPosition = 0
+	utf.symbolPosition = make([]int, 0)
+	utf.charSymbolDictionary = make(map[int]int)
+	utf.tableDescriptions = make(map[string]*tableDescription)
+	utf.outTablesData = make(map[string][]byte)
+	utf.Ascent = 0
+	utf.Descent = 0
+	codeType := uint32(utf.readUint32())
+	if codeType == 0x4F54544F {
+		return fmt.Errorf("not supported\n ")
+	}
+	if codeType == 0x74746366 {
+		return fmt.Errorf("not supported\n ")
+	}
+	if codeType != 0x00010000 && codeType != 0x74727565 {
+		return fmt.Errorf("Not a TrueType font: codeType=%v\n ", codeType)
+	}
+	utf.generateTableDescriptions()
+	utf.parseTables()
+	return nil
+}
+
+func (utf *utf8FontFile) generateTableDescriptions() {
+
+	tablesCount := utf.readUint16()
+	_ = utf.readUint16()
+	_ = utf.readUint16()
+	_ = utf.readUint16()
+	utf.tableDescriptions = make(map[string]*tableDescription)
+
+	for i := 0; i < tablesCount; i++ {
+		record := tableDescription{
+			name:     utf.readTableName(),
+			checksum: []int{utf.readUint16(), utf.readUint16()},
+			position: utf.readUint32(),
+			size:     utf.readUint32(),
+		}
+		utf.tableDescriptions[record.name] = &record
+	}
+}
+
+func (utf *utf8FontFile) readTableName() string {
+	return string(utf.fileReader.Read(4))
+}
+
+func (utf *utf8FontFile) readUint16() int {
+	s := utf.fileReader.Read(2)
+	return (int(s[0]) << 8) + int(s[1])
+}
+
+func (utf *utf8FontFile) readUint32() int {
+	s := utf.fileReader.Read(4)
+	return (int(s[0]) * 16777216) + (int(s[1]) << 16) + (int(s[2]) << 8) + int(s[3]) // 	16777216  = 1<<24
+}
+
+func (utf *utf8FontFile) calcInt32(x, y []int) []int {
+	answer := make([]int, 2)
+	if y[1] > x[1] {
+		x[1] += 1 << 16
+		x[0]++
+	}
+	answer[1] = x[1] - y[1]
+	if y[0] > x[0] {
+		x[0] += 1 << 16
+	}
+	answer[0] = x[0] - y[0]
+	answer[0] = answer[0] & 0xFFFF
+	return answer
+}
+
+func (utf *utf8FontFile) generateChecksum(data []byte) []int {
+	if (len(data) % 4) != 0 {
+		for i := 0; (len(data) % 4) != 0; i++ {
+			data = append(data, 0)
+		}
+	}
+	answer := []int{0x0000, 0x0000}
+	for i := 0; i < len(data); i += 4 {
+		answer[0] += (int(data[i]) << 8) + int(data[i+1])
+		answer[1] += (int(data[i+2]) << 8) + int(data[i+3])
+		answer[0] += answer[1] >> 16
+		answer[1] = answer[1] & 0xFFFF
+		answer[0] = answer[0] & 0xFFFF
+	}
+	return answer
+}
+
+func (utf *utf8FontFile) seek(shift int) {
+	_, _ = utf.fileReader.seek(int64(shift), 0)
+}
+
+func (utf *utf8FontFile) skip(delta int) {
+	_, _ = utf.fileReader.seek(int64(delta), 1)
+}
+
+//SeekTable position
+func (utf *utf8FontFile) SeekTable(name string) int {
+	return utf.seekTable(name, 0)
+}
+
+func (utf *utf8FontFile) seekTable(name string, offsetInTable int) int {
+	_, _ = utf.fileReader.seek(int64(utf.tableDescriptions[name].position+offsetInTable), 0)
+	return int(utf.fileReader.readerPosition)
+}
+
+func (utf *utf8FontFile) readInt16() int16 {
+	s := utf.fileReader.Read(2)
+	a := (int16(s[0]) << 8) + int16(s[1])
+	if (int(a) & (1 << 15)) == 0 {
+		a = int16(int(a) - (1 << 16))
+	}
+	return a
+}
+
+func (utf *utf8FontFile) getUint16(pos int) int {
+	_, _ = utf.fileReader.seek(int64(pos), 0)
+	s := utf.fileReader.Read(2)
+	return (int(s[0]) << 8) + int(s[1])
+}
+
+func (utf *utf8FontFile) splice(stream []byte, offset int, value []byte) []byte {
+	return append(append(stream[:offset], value...), stream[offset+len(value):]...)
+}
+
+func (utf *utf8FontFile) insertUint16(stream []byte, offset int, value int) []byte {
+	up := make([]byte, 2)
+	binary.BigEndian.PutUint16(up, uint16(value))
+	return utf.splice(stream, offset, up)
+}
+
+func (utf *utf8FontFile) getRange(pos, length int) []byte {
+	utf.fileReader.seek(int64(pos), 0)
+	if length < 1 {
+		return make([]byte, 0)
+	}
+	s := utf.fileReader.Read(length)
+	return s
+}
+
+func (utf *utf8FontFile) getTableData(name string) []byte {
+	desckrip := utf.tableDescriptions[name]
+	if desckrip == nil {
+		return nil
+	}
+	if desckrip.size == 0 {
+		return nil
+	}
+	utf.fileReader.seek(int64(desckrip.position), 0)
+	s := utf.fileReader.Read(desckrip.size)
+	return s
+}
+
+func (utf *utf8FontFile) setOutTable(name string, data []byte) {
+	if data == nil {
+		return
+	}
+	if name == "head" {
+		data = utf.splice(data, 8, []byte{0, 0, 0, 0})
+	}
+	utf.outTablesData[name] = data
+}
+
+func arrayKeys(arr map[int]string) []int {
+	answer := make([]int, len(arr))
+	i := 0
+	for key := range arr {
+		answer[i] = key
+		i++
+	}
+	return answer
+}
+
+func inArray(s int, arr []int) bool {
+	for _, i := range arr {
+		if s == i {
+			return true
+		}
+	}
+	return false
+}
+
+func (utf *utf8FontFile) parseNAMETable() int {
+	namePosition := utf.SeekTable("name")
+	format := utf.readUint16()
+	if format != 0 {
+		fmt.Printf("Illegal format %d\n", format)
+		return format
+	}
+	nameCount := utf.readUint16()
+	stringDataPosition := namePosition + utf.readUint16()
+	names := map[int]string{1: "", 2: "", 3: "", 4: "", 6: ""}
+	keys := arrayKeys(names)
+	counter := len(names)
+	for i := 0; i < nameCount; i++ {
+		system := utf.readUint16()
+		code := utf.readUint16()
+		local := utf.readUint16()
+		nameID := utf.readUint16()
+		size := utf.readUint16()
+		position := utf.readUint16()
+		if !inArray(nameID, keys) {
+			continue
+		}
+		currentName := ""
+		if system == 3 && code == 1 && local == 0x409 {
+			oldPos := utf.fileReader.readerPosition
+			utf.seek(stringDataPosition + position)
+			if size%2 != 0 {
+				fmt.Printf("name is not binar byte format\n")
+				return format
+			}
+			size /= 2
+			currentName = ""
+			for size > 0 {
+				char := utf.readUint16()
+				currentName += string(rune(char))
+				size--
+			}
+			utf.fileReader.readerPosition = oldPos
+			utf.seek(int(oldPos))
+		} else if system == 1 && code == 0 && local == 0 {
+			oldPos := utf.fileReader.readerPosition
+			currentName = string(utf.getRange(stringDataPosition+position, size))
+			utf.fileReader.readerPosition = oldPos
+			utf.seek(int(oldPos))
+		}
+		if currentName != "" && names[nameID] == "" {
+			names[nameID] = currentName
+			counter--
+			if counter == 0 {
+				break
+			}
+		}
+	}
+	return format
+}
+
+func (utf *utf8FontFile) parseHEADTable() {
+	utf.SeekTable("head")
+	utf.skip(18)
+	utf.fontElementSize = utf.readUint16()
+	scale := 1000.0 / float64(utf.fontElementSize)
+	utf.skip(16)
+	xMin := utf.readInt16()
+	yMin := utf.readInt16()
+	xMax := utf.readInt16()
+	yMax := utf.readInt16()
+	utf.Bbox = fontBoxType{int(float64(xMin) * scale), int(float64(yMin) * scale), int(float64(xMax) * scale), int(float64(yMax) * scale)}
+	utf.skip(3 * 2)
+	_ = utf.readUint16()
+	symbolDataFormat := utf.readUint16()
+	if symbolDataFormat != 0 {
+		fmt.Printf("Unknown symbol data format %d\n", symbolDataFormat)
+		return
+	}
+}
+
+func (utf *utf8FontFile) parseHHEATable() int {
+	metricsCount := 0
+	if _, OK := utf.tableDescriptions["hhea"]; OK {
+		scale := 1000.0 / float64(utf.fontElementSize)
+		utf.SeekTable("hhea")
+		utf.skip(4)
+		hheaAscender := utf.readInt16()
+		hheaDescender := utf.readInt16()
+		utf.Ascent = int(float64(hheaAscender) * scale)
+		utf.Descent = int(float64(hheaDescender) * scale)
+		utf.skip(24)
+		metricDataFormat := utf.readUint16()
+		if metricDataFormat != 0 {
+			fmt.Printf("Unknown horizontal metric data format %d\n", metricDataFormat)
+			return 0
+		}
+		metricsCount = utf.readUint16()
+		if metricsCount == 0 {
+			fmt.Printf("Number of horizontal metrics is 0\n")
+			return 0
+		}
+	}
+	return metricsCount
+}
+
+func (utf *utf8FontFile) parseOS2Table() int {
+	weightType := 0
+	scale := 1000.0 / float64(utf.fontElementSize)
+	if _, OK := utf.tableDescriptions["OS/2"]; OK {
+		utf.SeekTable("OS/2")
+		version := utf.readUint16()
+		utf.skip(2)
+		weightType = utf.readUint16()
+		utf.skip(2)
+		fsType := utf.readUint16()
+		if fsType == 0x0002 || (fsType&0x0300) != 0 {
+			fmt.Printf("ERROR - copyright restrictions.\n")
+			return 0
+		}
+		utf.skip(20)
+		_ = utf.readInt16()
+
+		utf.skip(36)
+		sTypoAscender := utf.readInt16()
+		sTypoDescender := utf.readInt16()
+		if utf.Ascent == 0 {
+			utf.Ascent = int(float64(sTypoAscender) * scale)
+		}
+		if utf.Descent == 0 {
+			utf.Descent = int(float64(sTypoDescender) * scale)
+		}
+		if version > 1 {
+			utf.skip(16)
+			sCapHeight := utf.readInt16()
+			utf.CapHeight = int(float64(sCapHeight) * scale)
+		} else {
+			utf.CapHeight = utf.Ascent
+		}
+	} else {
+		weightType = 500
+		if utf.Ascent == 0 {
+			utf.Ascent = int(float64(utf.Bbox.Ymax) * scale)
+		}
+		if utf.Descent == 0 {
+			utf.Descent = int(float64(utf.Bbox.Ymin) * scale)
+		}
+		utf.CapHeight = utf.Ascent
+	}
+	utf.StemV = 50 + int(math.Pow(float64(weightType)/65.0, 2))
+	return weightType
+}
+
+func (utf *utf8FontFile) parsePOSTTable(weight int) {
+	utf.SeekTable("post")
+	utf.skip(4)
+	utf.ItalicAngle = int(utf.readInt16()) + utf.readUint16()/65536.0
+	scale := 1000.0 / float64(utf.fontElementSize)
+	utf.UnderlinePosition = float64(utf.readInt16()) * scale
+	utf.UnderlineThickness = float64(utf.readInt16()) * scale
+	fixed := utf.readUint32()
+
+	utf.Flags = 4
+
+	if utf.ItalicAngle != 0 {
+		utf.Flags = utf.Flags | 64
+	}
+	if weight >= 600 {
+		utf.Flags = utf.Flags | 262144
+	}
+	if fixed != 0 {
+		utf.Flags = utf.Flags | 1
+	}
+}
+
+func (utf *utf8FontFile) parseCMAPTable(format int) int {
+	cmapPosition := utf.SeekTable("cmap")
+	utf.skip(2)
+	cmapTableCount := utf.readUint16()
+	cidCMAPPosition := 0
+	for i := 0; i < cmapTableCount; i++ {
+		system := utf.readUint16()
+		coded := utf.readUint16()
+		position := utf.readUint32()
+		oldReaderPosition := utf.fileReader.readerPosition
+		if (system == 3 && coded == 1) || system == 0 { // Microsoft, Unicode
+			format = utf.getUint16(cmapPosition + position)
+			if format == 4 {
+				if cidCMAPPosition == 0 {
+					cidCMAPPosition = cmapPosition + position
+				}
+				break
+			}
+		}
+		utf.seek(int(oldReaderPosition))
+	}
+	if cidCMAPPosition == 0 {
+		fmt.Printf("Font does not have cmap for Unicode\n")
+		return cidCMAPPosition
+	}
+	return cidCMAPPosition
+}
+
+func (utf *utf8FontFile) parseTables() {
+	f := utf.parseNAMETable()
+	utf.parseHEADTable()
+	n := utf.parseHHEATable()
+	w := utf.parseOS2Table()
+	utf.parsePOSTTable(w)
+	runeCMAPPosition := utf.parseCMAPTable(f)
+
+	utf.SeekTable("maxp")
+	utf.skip(4)
+	numSymbols := utf.readUint16()
+
+	symbolCharDictionary := make(map[int][]int)
+	charSymbolDictionary := make(map[int]int)
+	utf.generateSCCSDictionaries(runeCMAPPosition, symbolCharDictionary, charSymbolDictionary)
+
+	scale := 1000.0 / float64(utf.fontElementSize)
+	utf.parseHMTXTable(n, numSymbols, symbolCharDictionary, scale)
+}
+
+func (utf *utf8FontFile) generateCMAP() map[int][]int {
+	cmapPosition := utf.SeekTable("cmap")
+	utf.skip(2)
+	cmapTableCount := utf.readUint16()
+	runeCmapPosition := 0
+	for i := 0; i < cmapTableCount; i++ {
+		system := utf.readUint16()
+		coder := utf.readUint16()
+		position := utf.readUint32()
+		oldPosition := utf.fileReader.readerPosition
+		if (system == 3 && coder == 1) || system == 0 {
+			format := utf.getUint16(cmapPosition + position)
+			if format == 4 {
+				runeCmapPosition = cmapPosition + position
+				break
+			}
+		}
+		utf.seek(int(oldPosition))
+	}
+
+	if runeCmapPosition == 0 {
+		fmt.Printf("Font does not have cmap for Unicode\n")
+		return nil
+	}
+
+	symbolCharDictionary := make(map[int][]int)
+	charSymbolDictionary := make(map[int]int)
+	utf.generateSCCSDictionaries(runeCmapPosition, symbolCharDictionary, charSymbolDictionary)
+
+	utf.charSymbolDictionary = charSymbolDictionary
+
+	return symbolCharDictionary
+}
+
+func (utf *utf8FontFile) parseSymbols(usedRunes map[int]int) (map[int]int, map[int]int, map[int]int, []int) {
+	symbolCollection := map[int]int{0: 0}
+	charSymbolPairCollection := make(map[int]int)
+	for _, char := range usedRunes {
+		if _, OK := utf.charSymbolDictionary[char]; OK {
+			symbolCollection[utf.charSymbolDictionary[char]] = char
+			charSymbolPairCollection[char] = utf.charSymbolDictionary[char]
+
+		}
+		utf.LastRune = max(utf.LastRune, char)
+	}
+
+	begin := utf.tableDescriptions["glyf"].position
+
+	symbolArray := make(map[int]int)
+	symbolCollectionKeys := keySortInt(symbolCollection)
+
+	symbolCounter := 0
+	maxRune := 0
+	for _, oldSymbolIndex := range symbolCollectionKeys {
+		maxRune = max(maxRune, symbolCollection[oldSymbolIndex])
+		symbolArray[oldSymbolIndex] = symbolCounter
+		symbolCounter++
+	}
+	charSymbolPairCollectionKeys := keySortInt(charSymbolPairCollection)
+	runeSymbolPairCollection := make(map[int]int)
+	for _, runa := range charSymbolPairCollectionKeys {
+		runeSymbolPairCollection[runa] = symbolArray[charSymbolPairCollection[runa]]
+	}
+	utf.CodeSymbolDictionary = runeSymbolPairCollection
+
+	symbolCollectionKeys = keySortInt(symbolCollection)
+	for _, oldSymbolIndex := range symbolCollectionKeys {
+		_, symbolArray, symbolCollection, symbolCollectionKeys = utf.getSymbols(oldSymbolIndex, &begin, symbolArray, symbolCollection, symbolCollectionKeys)
+	}
+
+	return runeSymbolPairCollection, symbolArray, symbolCollection, symbolCollectionKeys
+}
+
+func (utf *utf8FontFile) generateCMAPTable(cidSymbolPairCollection map[int]int, numSymbols int) []byte {
+	cidSymbolPairCollectionKeys := keySortInt(cidSymbolPairCollection)
+	cidID := 0
+	cidArray := make(map[int][]int)
+	prevCid := -2
+	prevSymbol := -1
+	for _, cid := range cidSymbolPairCollectionKeys {
+		if cid == (prevCid+1) && cidSymbolPairCollection[cid] == (prevSymbol+1) {
+			if n, OK := cidArray[cidID]; !OK || n == nil {
+				cidArray[cidID] = make([]int, 0)
+			}
+			cidArray[cidID] = append(cidArray[cidID], cidSymbolPairCollection[cid])
+		} else {
+			cidID = cid
+			cidArray[cidID] = make([]int, 0)
+			cidArray[cidID] = append(cidArray[cidID], cidSymbolPairCollection[cid])
+		}
+		prevCid = cid
+		prevSymbol = cidSymbolPairCollection[cid]
+	}
+	cidArrayKeys := keySortArrayRangeMap(cidArray)
+	segCount := len(cidArray) + 1
+
+	searchRange := 1
+	entrySelector := 0
+	for searchRange*2 <= segCount {
+		searchRange = searchRange * 2
+		entrySelector = entrySelector + 1
+	}
+	searchRange = searchRange * 2
+	rangeShift := segCount*2 - searchRange
+	length := 16 + (8 * segCount) + (numSymbols + 1)
+	cmap := []int{0, 1, 3, 1, 0, 12, 4, length, 0, segCount * 2, searchRange, entrySelector, rangeShift}
+
+	for _, start := range cidArrayKeys {
+		endCode := start + (len(cidArray[start]) - 1)
+		cmap = append(cmap, endCode)
+	}
+	cmap = append(cmap, 0xFFFF)
+	cmap = append(cmap, 0)
+
+	for _, cidKey := range cidArrayKeys {
+		cmap = append(cmap, cidKey)
+	}
+	cmap = append(cmap, 0xFFFF)
+	for _, cidKey := range cidArrayKeys {
+		idDelta := -(cidKey - cidArray[cidKey][0])
+		cmap = append(cmap, idDelta)
+	}
+	cmap = append(cmap, 1)
+	for range cidArray {
+		cmap = append(cmap, 0)
+
+	}
+	cmap = append(cmap, 0)
+	for _, start := range cidArrayKeys {
+		for _, glidx := range cidArray[start] {
+			cmap = append(cmap, glidx)
+		}
+	}
+	cmap = append(cmap, 0)
+	cmapstr := make([]byte, 0)
+	for _, cm := range cmap {
+		cmapstr = append(cmapstr, packUint16(cm)...)
+	}
+	return cmapstr
+}
+
+//GenerateСutFont fill utf8FontFile from .utf file, only with runes from usedRunes
+func (utf *utf8FontFile) GenerateСutFont(usedRunes map[int]int) []byte {
+	utf.fileReader.readerPosition = 0
+	utf.symbolPosition = make([]int, 0)
+	utf.charSymbolDictionary = make(map[int]int)
+	utf.tableDescriptions = make(map[string]*tableDescription)
+	utf.outTablesData = make(map[string][]byte)
+	utf.Ascent = 0
+	utf.Descent = 0
+	utf.skip(4)
+	utf.LastRune = 0
+	utf.generateTableDescriptions()
+
+	utf.SeekTable("head")
+	utf.skip(50)
+	LocaFormat := utf.readUint16()
+
+	utf.SeekTable("hhea")
+	utf.skip(34)
+	metricsCount := utf.readUint16()
+	oldMetrics := metricsCount
+
+	utf.SeekTable("maxp")
+	utf.skip(4)
+	numSymbols := utf.readUint16()
+
+	symbolCharDictionary := utf.generateCMAP()
+	if symbolCharDictionary == nil {
+		return nil
+	}
+
+	utf.parseHMTXTable(metricsCount, numSymbols, symbolCharDictionary, 1.0)
+
+	utf.parseLOCATable(LocaFormat, numSymbols)
+
+	cidSymbolPairCollection, symbolArray, symbolCollection, symbolCollectionKeys := utf.parseSymbols(usedRunes)
+
+	metricsCount = len(symbolCollection)
+	numSymbols = metricsCount
+
+	utf.setOutTable("name", utf.getTableData("name"))
+	utf.setOutTable("cvt ", utf.getTableData("cvt "))
+	utf.setOutTable("fpgm", utf.getTableData("fpgm"))
+	utf.setOutTable("prep", utf.getTableData("prep"))
+	utf.setOutTable("gasp", utf.getTableData("gasp"))
+
+	postTable := utf.getTableData("post")
+	postTable = append(append([]byte{0x00, 0x03, 0x00, 0x00}, postTable[4:16]...), []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}...)
+	utf.setOutTable("post", postTable)
+
+	delete(cidSymbolPairCollection, 0)
+
+	utf.setOutTable("cmap", utf.generateCMAPTable(cidSymbolPairCollection, numSymbols))
+
+	symbolData := utf.getTableData("glyf")
+
+	offsets := make([]int, 0)
+	glyfData := make([]byte, 0)
+	pos := 0
+	hmtxData := make([]byte, 0)
+	utf.symbolData = make(map[int]map[string][]int, 0)
+
+	for _, originalSymbolIdx := range symbolCollectionKeys {
+		hm := utf.getMetrics(oldMetrics, originalSymbolIdx)
+		hmtxData = append(hmtxData, hm...)
+
+		offsets = append(offsets, pos)
+		symbolPos := utf.symbolPosition[originalSymbolIdx]
+		symbolLen := utf.symbolPosition[originalSymbolIdx+1] - symbolPos
+		data := symbolData[symbolPos : symbolPos+symbolLen]
+		var up int
+		if symbolLen > 0 {
+			up = unpackUint16(data[0:2])
+		}
+
+		if symbolLen > 2 && (up&(1<<15)) != 0 {
+			posInSymbol := 10
+			flags := symbolContinue
+			nComponentElements := 0
+			for (flags & symbolContinue) != 0 {
+				nComponentElements++
+				up = unpackUint16(data[posInSymbol : posInSymbol+2])
+				flags = up
+				up = unpackUint16(data[posInSymbol+2 : posInSymbol+4])
+				symbolIdx := up
+				if _, OK := utf.symbolData[originalSymbolIdx]; !OK {
+					utf.symbolData[originalSymbolIdx] = make(map[string][]int)
+				}
+				if _, OK := utf.symbolData[originalSymbolIdx]["compSymbols"]; !OK {
+					utf.symbolData[originalSymbolIdx]["compSymbols"] = make([]int, 0)
+				}
+				utf.symbolData[originalSymbolIdx]["compSymbols"] = append(utf.symbolData[originalSymbolIdx]["compSymbols"], symbolIdx)
+				data = utf.insertUint16(data, posInSymbol+2, symbolArray[symbolIdx])
+				posInSymbol += 4
+				if (flags & symbolWords) != 0 {
+					posInSymbol += 4
+				} else {
+					posInSymbol += 2
+				}
+				if (flags & symbolScale) != 0 {
+					posInSymbol += 2
+				} else if (flags & symbolAllScale) != 0 {
+					posInSymbol += 4
+				} else if (flags & symbol2x2) != 0 {
+					posInSymbol += 8
+				}
+			}
+		}
+
+		glyfData = append(glyfData, data...)
+		pos += symbolLen
+		if pos%4 != 0 {
+			padding := 4 - (pos % 4)
+			glyfData = append(glyfData, make([]byte, padding)...)
+			pos += padding
+		}
+	}
+
+	offsets = append(offsets, pos)
+	utf.setOutTable("glyf", glyfData)
+
+	utf.setOutTable("hmtx", hmtxData)
+
+	locaData := make([]byte, 0)
+	if ((pos + 1) >> 1) > 0xFFFF {
+		LocaFormat = 1
+		for _, offset := range offsets {
+			locaData = append(locaData, packUint32(offset)...)
+		}
+	} else {
+		LocaFormat = 0
+		for _, offset := range offsets {
+			locaData = append(locaData, packUint16(offset/2)...)
+		}
+	}
+	utf.setOutTable("loca", locaData)
+
+	headData := utf.getTableData("head")
+	headData = utf.insertUint16(headData, 50, LocaFormat)
+	utf.setOutTable("head", headData)
+
+	hheaData := utf.getTableData("hhea")
+	hheaData = utf.insertUint16(hheaData, 34, metricsCount)
+	utf.setOutTable("hhea", hheaData)
+
+	maxp := utf.getTableData("maxp")
+	maxp = utf.insertUint16(maxp, 4, numSymbols)
+	utf.setOutTable("maxp", maxp)
+
+	os2Data := utf.getTableData("OS/2")
+	utf.setOutTable("OS/2", os2Data)
+
+	return utf.assembleTables()
+}
+
+func (utf *utf8FontFile) getSymbols(originalSymbolIdx int, start *int, symbolSet map[int]int, SymbolsCollection map[int]int, SymbolsCollectionKeys []int) (*int, map[int]int, map[int]int, []int) {
+	symbolPos := utf.symbolPosition[originalSymbolIdx]
+	symbolSize := utf.symbolPosition[originalSymbolIdx+1] - symbolPos
+	if symbolSize == 0 {
+		return start, symbolSet, SymbolsCollection, SymbolsCollectionKeys
+	}
+	utf.seek(*start + symbolPos)
+
+	lineCount := utf.readInt16()
+
+	if lineCount < 0 {
+		utf.skip(8)
+		flags := symbolContinue
+		for flags&symbolContinue != 0 {
+			flags = utf.readUint16()
+			symbolIndex := utf.readUint16()
+			if _, OK := symbolSet[symbolIndex]; !OK {
+				symbolSet[symbolIndex] = len(SymbolsCollection)
+				SymbolsCollection[symbolIndex] = 1
+				SymbolsCollectionKeys = append(SymbolsCollectionKeys, symbolIndex)
+			}
+			oldPosition, _ := utf.fileReader.seek(0, 1)
+			_, _, _, SymbolsCollectionKeys = utf.getSymbols(symbolIndex, start, symbolSet, SymbolsCollection, SymbolsCollectionKeys)
+			utf.seek(int(oldPosition))
+			if flags&symbolWords != 0 {
+				utf.skip(4)
+			} else {
+				utf.skip(2)
+			}
+			if flags&symbolScale != 0 {
+				utf.skip(2)
+			} else if flags&symbolAllScale != 0 {
+				utf.skip(4)
+			} else if flags&symbol2x2 != 0 {
+				utf.skip(8)
+			}
+		}
+	}
+	return start, symbolSet, SymbolsCollection, SymbolsCollectionKeys
+}
+
+func (utf *utf8FontFile) parseHMTXTable(numberOfHMetrics, numSymbols int, symbolToChar map[int][]int, scale float64) {
+	start := utf.SeekTable("hmtx")
+	arrayWidths := 0
+	widths := 0
+	var arr []int
+	utf.CharWidths = make([]int, 256*256)
+	charCount := 0
+	arr = unpackUint16Array(utf.getRange(start, numberOfHMetrics*4))
+	for symbol := 0; symbol < numberOfHMetrics; symbol++ {
+		arrayWidths = arr[(symbol*2)+1]
+		if _, OK := symbolToChar[symbol]; OK || symbol == 0 {
+
+			if arrayWidths >= (1 << 15) {
+				arrayWidths = 0
+			}
+			if symbol == 0 {
+				utf.DefaultWidth = scale * float64(arrayWidths)
+				continue
+			}
+			for _, char := range symbolToChar[symbol] {
+				if char != 0 && char != 65535 {
+					widths = int(math.Round(scale * float64(arrayWidths)))
+					if widths == 0 {
+						widths = 65535
+					}
+					if char < 196608 {
+						utf.CharWidths[char] = widths
+						charCount++
+					}
+				}
+			}
+		}
+	}
+	data := utf.getRange(start+numberOfHMetrics*4, numSymbols*2)
+	arr = unpackUint16Array(data)
+	diff := numSymbols - numberOfHMetrics
+	for pos := 0; pos < diff; pos++ {
+		symbol := pos + numberOfHMetrics
+		if _, OK := symbolToChar[symbol]; OK {
+			for _, char := range symbolToChar[symbol] {
+				if char != 0 && char != 65535 {
+					widths = int(math.Round(scale * float64(arrayWidths)))
+					if widths == 0 {
+						widths = 65535
+					}
+					if char < 196608 {
+						utf.CharWidths[char] = widths
+						charCount++
+					}
+				}
+			}
+		}
+	}
+	utf.CharWidths[0] = charCount
+}
+
+func (utf *utf8FontFile) getMetrics(metricCount, gid int) []byte {
+	start := utf.SeekTable("hmtx")
+	var metrics []byte
+	if gid < metricCount {
+		utf.seek(start + (gid * 4))
+		metrics = utf.fileReader.Read(4)
+	} else {
+		utf.seek(start + ((metricCount - 1) * 4))
+		metrics = utf.fileReader.Read(2)
+		utf.seek(start + (metricCount * 2) + (gid * 2))
+		metrics = append(metrics, utf.fileReader.Read(2)...)
+	}
+	return metrics
+}
+
+func (utf *utf8FontFile) parseLOCATable(format, numSymbols int) {
+	start := utf.SeekTable("loca")
+	utf.symbolPosition = make([]int, 0)
+	if format == 0 {
+		data := utf.getRange(start, (numSymbols*2)+2)
+		arr := unpackUint16Array(data)
+		for n := 0; n <= numSymbols; n++ {
+			utf.symbolPosition = append(utf.symbolPosition, arr[n+1]*2)
+		}
+	} else if format == 1 {
+		data := utf.getRange(start, (numSymbols*4)+4)
+		arr := unpackUint32Array(data)
+		for n := 0; n <= numSymbols; n++ {
+			utf.symbolPosition = append(utf.symbolPosition, arr[n+1])
+		}
+	} else {
+		fmt.Printf("Unknown loca table format %d\n", format)
+		return
+	}
+}
+
+func (utf *utf8FontFile) generateSCCSDictionaries(runeCmapPosition int, symbolCharDictionary map[int][]int, charSymbolDictionary map[int]int) {
+	maxRune := 0
+	utf.seek(runeCmapPosition + 2)
+	size := utf.readUint16()
+	rim := runeCmapPosition + size
+	utf.skip(2)
+
+	segmentSize := utf.readUint16() / 2
+	utf.skip(6)
+	completers := make([]int, 0)
+	for i := 0; i < segmentSize; i++ {
+		completers = append(completers, utf.readUint16())
+	}
+	utf.skip(2)
+	beginners := make([]int, 0)
+	for i := 0; i < segmentSize; i++ {
+		beginners = append(beginners, utf.readUint16())
+	}
+	sizes := make([]int, 0)
+	for i := 0; i < segmentSize; i++ {
+		sizes = append(sizes, int(utf.readInt16()))
+	}
+	readerPositionStart := utf.fileReader.readerPosition
+	positions := make([]int, 0)
+	for i := 0; i < segmentSize; i++ {
+		positions = append(positions, utf.readUint16())
+	}
+	symbol := 0
+	for n := 0; n < segmentSize; n++ {
+		completePosition := completers[n] + 1
+		for char := beginners[n]; char < completePosition; char++ {
+			if positions[n] == 0 {
+				symbol = (char + sizes[n]) & 0xFFFF
+			} else {
+				position := (char-beginners[n])*2 + positions[n]
+				position = int(readerPositionStart) + 2*n + position
+				if position >= rim {
+					symbol = 0
+				} else {
+					symbol = utf.getUint16(position)
+					if symbol != 0 {
+						symbol = (symbol + sizes[n]) & 0xFFFF
+					}
+				}
+			}
+			charSymbolDictionary[char] = symbol
+			if char < 196608 {
+				maxRune = max(char, maxRune)
+			}
+			symbolCharDictionary[symbol] = append(symbolCharDictionary[symbol], char)
+		}
+	}
+}
+
+func max(i, n int) int {
+	if n > i {
+		return n
+	}
+	return i
+}
+
+func (utf *utf8FontFile) assembleTables() []byte {
+	answer := make([]byte, 0)
+	tablesCount := len(utf.outTablesData)
+	findSize := 1
+	writer := 0
+	for findSize*2 <= tablesCount {
+		findSize = findSize * 2
+		writer = writer + 1
+	}
+	findSize = findSize * 16
+	rOffset := tablesCount*16 - findSize
+
+	answer = append(answer, packHeader(0x00010000, tablesCount, findSize, writer, rOffset)...)
+
+	tables := utf.outTablesData
+	tablesNames := keySortStrings(tables)
+
+	offset := 12 + tablesCount*16
+	begin := 0
+
+	for _, name := range tablesNames {
+		if name == "head" {
+			begin = offset
+		}
+		answer = append(answer, []byte(name)...)
+		checksum := utf.generateChecksum(tables[name])
+		answer = append(answer, pack2Uint16(checksum[0], checksum[1])...)
+		answer = append(answer, pack2Uint32(offset, len(tables[name]))...)
+		paddedLength := (len(tables[name]) + 3) &^ 3
+		offset = offset + paddedLength
+	}
+
+	for _, key := range tablesNames {
+		data := tables[key]
+		data = append(data, []byte{0, 0, 0}...)
+		answer = append(answer, data[:(len(data)&^3)]...)
+	}
+
+	checksum := utf.generateChecksum([]byte(answer))
+	checksum = utf.calcInt32([]int{0xB1B0, 0xAFBA}, checksum)
+	answer = utf.splice(answer, (begin + 8), pack2Uint16(checksum[0], checksum[1]))
+	return answer
+}
+
+func unpackUint16Array(data []byte) []int {
+	answer := make([]int, 1)
+	r := bytes.NewReader(data)
+	bs := make([]byte, 2)
+	var e error
+	var c int
+	c, e = r.Read(bs)
+	for e == nil && c > 0 {
+		answer = append(answer, int(binary.BigEndian.Uint16(bs)))
+		c, e = r.Read(bs)
+	}
+	return answer
+}
+
+func unpackUint32Array(data []byte) []int {
+	answer := make([]int, 1)
+	r := bytes.NewReader(data)
+	bs := make([]byte, 4)
+	var e error
+	var c int
+	c, e = r.Read(bs)
+	for e == nil && c > 0 {
+		answer = append(answer, int(binary.BigEndian.Uint32(bs)))
+		c, e = r.Read(bs)
+	}
+	return answer
+}
+
+func unpackUint16(data []byte) int {
+	return int(binary.BigEndian.Uint16(data))
+}
+
+func packHeader(N uint32, n1, n2, n3, n4 int) []byte {
+	answer := make([]byte, 0)
+	bs4 := make([]byte, 4)
+	binary.BigEndian.PutUint32(bs4, N)
+	answer = append(answer, bs4...)
+	bs := make([]byte, 2)
+	binary.BigEndian.PutUint16(bs, uint16(n1))
+	answer = append(answer, bs...)
+	binary.BigEndian.PutUint16(bs, uint16(n2))
+	answer = append(answer, bs...)
+	binary.BigEndian.PutUint16(bs, uint16(n3))
+	answer = append(answer, bs...)
+	binary.BigEndian.PutUint16(bs, uint16(n4))
+	answer = append(answer, bs...)
+	return answer
+}
+
+func pack2Uint16(n1, n2 int) []byte {
+	answer := make([]byte, 0)
+	bs := make([]byte, 2)
+	binary.BigEndian.PutUint16(bs, uint16(n1))
+	answer = append(answer, bs...)
+	binary.BigEndian.PutUint16(bs, uint16(n2))
+	answer = append(answer, bs...)
+	return answer
+}
+
+func pack2Uint32(n1, n2 int) []byte {
+	answer := make([]byte, 0)
+	bs := make([]byte, 4)
+	binary.BigEndian.PutUint32(bs, uint32(n1))
+	answer = append(answer, bs...)
+	binary.BigEndian.PutUint32(bs, uint32(n2))
+	answer = append(answer, bs...)
+	return answer
+}
+
+func packUint32(n1 int) []byte {
+	bs := make([]byte, 4)
+	binary.BigEndian.PutUint32(bs, uint32(n1))
+	return bs
+}
+
+func packUint16(n1 int) []byte {
+	bs := make([]byte, 2)
+	binary.BigEndian.PutUint16(bs, uint16(n1))
+	return bs
+}
+
+func keySortStrings(s map[string][]byte) []string {
+	keys := make([]string, len(s))
+	i := 0
+	for key := range s {
+		keys[i] = key
+		i++
+	}
+	sort.Strings(keys)
+	return keys
+}
+
+func keySortInt(s map[int]int) []int {
+	keys := make([]int, len(s))
+	i := 0
+	for key := range s {
+		keys[i] = key
+		i++
+	}
+	sort.Ints(keys)
+	return keys
+}
+
+func keySortArrayRangeMap(s map[int][]int) []int {
+	keys := make([]int, len(s))
+	i := 0
+	for key := range s {
+		keys[i] = key
+		i++
+	}
+	sort.Ints(keys)
+	return keys
+}