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unicode_map.go
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/
unicode_map.go
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package gopdf
import (
"bytes"
"fmt"
)
// UnicodeMap unicode map
type UnicodeMap struct {
buffer bytes.Buffer
PtrToSubsetFontObj *SubsetFontObj
//getRoot func() *GoPdf
pdfProtection *PDFProtection
}
func (u *UnicodeMap) init(funcGetRoot func() *GoPdf) {
//u.getRoot = funcGetRoot
}
func (u *UnicodeMap) setProtection(p *PDFProtection) {
u.pdfProtection = p
}
func (u *UnicodeMap) protection() *PDFProtection {
return u.pdfProtection
}
// SetPtrToSubsetFontObj set pointer to SubsetFontObj
func (u *UnicodeMap) SetPtrToSubsetFontObj(ptr *SubsetFontObj) {
u.PtrToSubsetFontObj = ptr
}
func (u *UnicodeMap) build(objID int) error {
buff, err := u.pdfToUnicodeMap(objID)
if err != nil {
return err
}
u.buffer.Write(buff.Bytes())
return nil
}
func (u *UnicodeMap) getType() string {
return "Unicode"
}
func (u *UnicodeMap) getObjBuff() *bytes.Buffer {
return &u.buffer
}
func (u *UnicodeMap) pdfToUnicodeMap(objID int) (*bytes.Buffer, error) {
//stream
//characterToGlyphIndex := u.PtrToSubsetFontObj.CharacterToGlyphIndex
prefix :=
"/CIDInit /ProcSet findresource begin\n" +
"12 dict begin\n" +
"begincmap\n" +
"/CIDSystemInfo << /Registry (Adobe)/Ordering (UCS)/Supplement 0>> def\n" +
"/CMapName /Adobe-Identity-UCS def /CMapType 2 def\n"
suffix := "endcmap CMapName currentdict /CMap defineresource pop end end"
glyphIndexToCharacter := newMapGlyphIndexToCharacter() //make(map[int]rune)
lowIndex := 65536
hiIndex := -1
keys := u.PtrToSubsetFontObj.CharacterToGlyphIndex.AllKeys()
for _, k := range keys {
v, _ := u.PtrToSubsetFontObj.CharacterToGlyphIndex.Val(k)
index := int(v)
if index < lowIndex {
lowIndex = index
}
if index > hiIndex {
hiIndex = index
}
//glyphIndexToCharacter[index] = k
glyphIndexToCharacter.set(index, k)
}
var buff bytes.Buffer
buff.WriteString(prefix)
buff.WriteString("1 begincodespacerange\n")
buff.WriteString(fmt.Sprintf("<%04X><%04X>\n", lowIndex, hiIndex))
buff.WriteString("endcodespacerange\n")
buff.WriteString(fmt.Sprintf("%d beginbfrange\n", glyphIndexToCharacter.size()))
indexs := glyphIndexToCharacter.allIndexs()
for _, k := range indexs {
v, _ := glyphIndexToCharacter.runeByIndex(k)
buff.WriteString(fmt.Sprintf("<%04X><%04X><%04X>\n", k, k, v))
}
buff.WriteString("endbfrange\n")
buff.WriteString(suffix)
buff.WriteString("\n")
length := buff.Len()
var streambuff bytes.Buffer
streambuff.WriteString("<<\n")
streambuff.WriteString(fmt.Sprintf("/Length %d\n", length))
streambuff.WriteString(">>\n")
streambuff.WriteString("stream\n")
if u.protection() != nil {
tmp, err := rc4Cip(u.protection().objectkey(objID), buff.Bytes())
if err != nil {
return nil, err
}
streambuff.Write(tmp)
//streambuff.WriteString("\n")
} else {
streambuff.Write(buff.Bytes())
}
streambuff.WriteString("endstream\n")
return &streambuff, nil
}
// GetObjBuff get buffer
func (u *UnicodeMap) GetObjBuff() *bytes.Buffer {
return u.getObjBuff()
}
// Build build buffer
func (u *UnicodeMap) Build(objID int) error {
return u.build(objID)
}
type mapGlyphIndexToCharacter struct {
runes []rune
indexs []int
}
func newMapGlyphIndexToCharacter() *mapGlyphIndexToCharacter {
var m mapGlyphIndexToCharacter
return &m
}
func (m *mapGlyphIndexToCharacter) set(index int, r rune) {
m.runes = append(m.runes, r)
m.indexs = append(m.indexs, index)
}
func (m *mapGlyphIndexToCharacter) size() int {
return len(m.indexs)
}
func (m *mapGlyphIndexToCharacter) allIndexs() []int {
return m.indexs
}
func (m *mapGlyphIndexToCharacter) runeByIndex(index int) (rune, bool) {
var r rune
ok := false
for i, idx := range m.indexs {
if idx == index {
r = m.runes[i]
ok = true
break
}
}
return r, ok
}