k
/
legado
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

实现网页内嵌字体替换功能

Browse Source
pull/493/head
Antecer 4 years ago
parent 2385c3ebc8
commit 6a91fd6630
3 changed files with 610 additions and 605 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 605
      app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.java
  2. 602
      app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.kt
  3. 8
      app/src/main/java/io/legado/app/model/webBook/BookContent.kt

605
app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.java
Unescape View File

@ -0,0 +1,605 @@
package io.legado.app.model.analyzeRule;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.commons.lang3.tuple.Triple;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
public class QueryTTF {
private class Header {
public int majorVersion;
public int minorVersion;
public int numOfTables;
public int searchRange;
public int entrySelector;
public int rangeShift;
}
private class Directory {
public String tag; // table name
public int checkSum; // Check sum
public int offset; // Offset from beginning of file
public int length; // length of the table in bytes
}
private class NameLayout {
public int format;
public int count;
public int stringOffset;
public List<NameRecord> records = new LinkedList<>();
}
private class NameRecord {
public int platformID; // 平台标识符<0:Unicode, 1:Mac, 2:ISO, 3:Windows, 4:Custom>
public int encodingID; // 编码标识符
public int languageID; // 语言标识符
public int nameID; // 名称标识符
public int length; // 名称字符串的长度
public int offset; // 名称字符串相对于stringOffset的字节偏移量
}
private class HeadLayout {
public int majorVersion;
public int minorVersion;
public int fontRevision;
public int checkSumAdjustment;
public int magicNumber;
public int flags;
public int unitsPerEm;
public long created;
public long modified;
public short xMin;
public short yMin;
public short xMax;
public short yMax;
public int macStyle;
public int lowestRecPPEM;
public short fontDirectionHint;
public short indexToLocFormat; // <0:loca是2字节数组, 1:loca是4字节数组>
public short glyphDataFormat;
}
private class MaxpLayout {
public int majorVersion;
public int minorVersion;
public int numGlyphs; // 字体中的字形数量
public int maxPoints;
public int maxContours;
public int maxCompositePoints;
public int maxCompositeContours;
public int maxZones;
public int maxTwilightPoints;
public int maxStorage;
public int maxFunctionDefs;
public int maxInstructionDefs;
public int maxStackElements;
public int maxSizeOfInstructions;
public int maxComponentElements;
public int maxComponentDepth;
}
private class CmapLayout {
public int version;
public int numTables;
public List<CmapRecord> records = new LinkedList<>();
public Map<Integer, CmapFormat> tables = new HashMap<>();
}
private class CmapRecord {
public int platformID;
public int encodingID;
public int offset;
}
private class CmapFormat {
public int format;
public int length;
public int language;
public byte[] glyphIdArray;
}
private class CmapFormat4 extends CmapFormat {
public int segCountX2;
public int searchRange;
public int entrySelector;
public int rangeShift;
public int[] endCode;
public int reservedPad;
public int[] startCode;
public short[] idDelta;
public int[] idRangeOffset;
public int[] glyphIdArray;
}
private class CmapFormat6 extends CmapFormat {
public int firstCode;
public int entryCount;
public int[] glyphIdArray;
}
private class CmapFormat12 extends CmapFormat {
public int reserved;
public int length;
public int language;
public int numGroups;
public List<Triple<Integer, Integer, Integer>> groups;
}
private class GlyfLayout {
public short numberOfContours; // 非负值为简单字型,负值为符合字型
public short xMin;
public short yMin;
public short xMax;
public short yMax;
public int[] endPtsOfContours; // length=numberOfContours
public int instructionLength;
public byte[] instructions; // length=instructionLength
public byte[] flags;
public short[] xCoordinates; // length = flags.length
public short[] yCoordinates; // length = flags.length
}
private class ByteArrayReader {
public int Index;
public byte[] Buffer;
public ByteArrayReader(byte[] buffer, int index) {
Buffer = buffer;
Index = index;
}
public long ReadUIntX(long len) {
long result = 0;
for (long i = 0; i < len; ++i) {
result <<= 8;
result |= Buffer[Index++] & 0xFF;
}
return result;
}
public long ReadUInt64() {
return ReadUIntX(8);
}
public long ReadInt64() {
return ReadUIntX(8);
}
public int ReadUInt32() {
return (int) ReadUIntX(4);
}
public int ReadInt32() {
return (int) ReadUIntX(4);
}
public int ReadUInt16() {
return (int) ReadUIntX(2);
}
public short ReadInt16() {
return (short) ReadUIntX(2);
}
public short ReadUInt8() {
return (short) ReadUIntX(1);
}
public String ReadStrings(int len, Charset charset) {
byte[] result = len > 0 ? new byte[len] : null;
for (int i = 0; i < len; ++i) result[i] = Buffer[Index++];
return new String(result, charset);
}
public byte GetByte() {
return Buffer[Index++];
}
public byte[] GetBytes(int len) {
byte[] result = len > 0 ? new byte[len] : null;
for (int i = 0; i < len; ++i) result[i] = Buffer[Index++];
return result;
}
public int[] GetUInt16Array(int len) {
int[] result = len > 0 ? new int[len] : null;
for (int i = 0; i < len; ++i) result[i] = ReadUInt16();
return result;
}
public short[] GetInt16Array(int len) {
short[] result = len > 0 ? new short[len] : null;
for (int i = 0; i < len; ++i) result[i] = ReadInt16();
return result;
}
}
private final ByteArrayReader FontReader;
private final Header FileHeader = new Header();
private final List<Directory> Directorys = new LinkedList<>();
private final NameLayout Name = new NameLayout();
private final HeadLayout Head = new HeadLayout();
private final MaxpLayout Maxp = new MaxpLayout();
private final List<Integer> Loca = new LinkedList<>();
private final CmapLayout Cmap = new CmapLayout();
private final List<GlyfLayout> Glyf = new LinkedList<>();
private final Map<Integer, short[]> UnicodeMap = new HashMap<>();
private final Pair<Integer, Integer>[] pps = new Pair[]{
Pair.of(3, 10),
Pair.of(0, 4),
Pair.of(3, 1),
Pair.of(1, 0),
Pair.of(0, 3),
Pair.of(0, 1)
};
/**
* 构造函数
*
* @param buffer 传入TTF字体二进制数组
*/
public QueryTTF(byte[] buffer) {
FontReader = new ByteArrayReader(buffer, 0);
// 获取文件头
FileHeader.majorVersion = FontReader.ReadUInt16();
FileHeader.minorVersion = FontReader.ReadUInt16();
FileHeader.numOfTables = FontReader.ReadUInt16();
FileHeader.searchRange = FontReader.ReadUInt16();
FileHeader.entrySelector = FontReader.ReadUInt16();
FileHeader.rangeShift = FontReader.ReadUInt16();
// 获取目录
for (int i = 0; i < FileHeader.numOfTables; ++i) {
Directory d = new Directory();
d.tag = FontReader.ReadStrings(4, StandardCharsets.US_ASCII);
d.checkSum = FontReader.ReadUInt32();
d.offset = FontReader.ReadUInt32();
d.length = FontReader.ReadUInt32();
Directorys.add(d);
}
// 解析表 name (字体信息,包含版权、名称、作者等...)
for (Directory Temp : Directorys) {
if (Temp.tag.equals("name")) {
FontReader.Index = Temp.offset;
Name.format = FontReader.ReadUInt16();
Name.count = FontReader.ReadUInt16();
Name.stringOffset = FontReader.ReadUInt16();
for (int i = 0; i < Name.count; ++i) {
NameRecord record = new NameRecord();
record.platformID = FontReader.ReadUInt16();
record.encodingID = FontReader.ReadUInt16();
record.languageID = FontReader.ReadUInt16();
record.nameID = FontReader.ReadUInt16();
record.length = FontReader.ReadUInt16();
record.offset = FontReader.ReadUInt16();
Name.records.add(record);
}
}
}
// 解析表 head (获取 head.indexToLocFormat)
for (Directory Temp : Directorys) {
if (Temp.tag.equals("head")) {
FontReader.Index = Temp.offset;
Head.majorVersion = FontReader.ReadUInt16();
Head.minorVersion = FontReader.ReadUInt16();
Head.fontRevision = FontReader.ReadUInt32();
Head.checkSumAdjustment = FontReader.ReadUInt32();
Head.magicNumber = FontReader.ReadUInt32();
Head.flags = FontReader.ReadUInt16();
Head.unitsPerEm = FontReader.ReadUInt16();
Head.created = FontReader.ReadUInt64();
Head.modified = FontReader.ReadUInt64();
Head.xMin = FontReader.ReadInt16();
Head.yMin = FontReader.ReadInt16();
Head.xMax = FontReader.ReadInt16();
Head.yMax = FontReader.ReadInt16();
Head.macStyle = FontReader.ReadUInt16();
Head.lowestRecPPEM = FontReader.ReadUInt16();
Head.fontDirectionHint = FontReader.ReadInt16();
Head.indexToLocFormat = FontReader.ReadInt16();
Head.glyphDataFormat = FontReader.ReadInt16();
}
}
// 解析表 maxp (获取 maxp.numGlyphs)
for (Directory Temp : Directorys) {
if (Temp.tag.equals("maxp")) {
FontReader.Index = Temp.offset;
Maxp.majorVersion = FontReader.ReadUInt16();
Maxp.minorVersion = FontReader.ReadUInt16();
Maxp.numGlyphs = FontReader.ReadUInt16();
Maxp.maxPoints = FontReader.ReadUInt16();
Maxp.maxContours = FontReader.ReadUInt16();
Maxp.maxCompositePoints = FontReader.ReadUInt16();
Maxp.maxCompositeContours = FontReader.ReadUInt16();
Maxp.maxZones = FontReader.ReadUInt16();
Maxp.maxTwilightPoints = FontReader.ReadUInt16();
Maxp.maxStorage = FontReader.ReadUInt16();
Maxp.maxFunctionDefs = FontReader.ReadUInt16();
Maxp.maxInstructionDefs = FontReader.ReadUInt16();
Maxp.maxStackElements = FontReader.ReadUInt16();
Maxp.maxSizeOfInstructions = FontReader.ReadUInt16();
Maxp.maxComponentElements = FontReader.ReadUInt16();
Maxp.maxComponentDepth = FontReader.ReadUInt16();
}
}
// 解析表 loca (轮廓数据偏移地址表)
for (Directory Temp : Directorys) {
if (Temp.tag.equals("loca")) {
FontReader.Index = Temp.offset;
int offset = Head.indexToLocFormat == 0 ? 2 : 4;
for (long i = 0; i < Temp.length; i += offset) {
Loca.add(offset == 2 ? FontReader.ReadUInt16() << 1 : FontReader.ReadUInt32());
}
}
}
// 解析表 cmap (Unicode编码轮廓索引对照表)
for (Directory Temp : Directorys) {
if (Temp.tag.equals("cmap")) {
FontReader.Index = Temp.offset;
Cmap.version = FontReader.ReadUInt16();
Cmap.numTables = FontReader.ReadUInt16();
for (int i = 0; i < Cmap.numTables; ++i) {
CmapRecord record = new CmapRecord();
record.platformID = FontReader.ReadUInt16();
record.encodingID = FontReader.ReadUInt16();
record.offset = FontReader.ReadUInt32();
Cmap.records.add(record);
}
for (int i = 0; i < Cmap.numTables; ++i) {
int fmtOffset = Cmap.records.get(i).offset;
FontReader.Index = Temp.offset + fmtOffset;
int EndIndex = FontReader.Index;
int format = FontReader.ReadUInt16();
if (Cmap.tables.containsKey(fmtOffset)) continue;
if (format == 0) {
CmapFormat f = new CmapFormat();
f.format = format;
f.length = FontReader.ReadUInt16();
f.language = FontReader.ReadUInt16();
f.glyphIdArray = FontReader.GetBytes(f.length - 6);
Cmap.tables.put(fmtOffset, f);
} else if (format == 4) {
CmapFormat4 f = new CmapFormat4();
f.format = format;
f.length = FontReader.ReadUInt16();
f.language = FontReader.ReadUInt16();
f.segCountX2 = FontReader.ReadUInt16();
int segCount = f.segCountX2 >> 1;
f.searchRange = FontReader.ReadUInt16();
f.entrySelector = FontReader.ReadUInt16();
f.rangeShift = FontReader.ReadUInt16();
f.endCode = FontReader.GetUInt16Array(segCount);
f.reservedPad = FontReader.ReadUInt16();
f.startCode = FontReader.GetUInt16Array(segCount);
f.idDelta = FontReader.GetInt16Array(segCount);
f.idRangeOffset = FontReader.GetUInt16Array(segCount);
f.glyphIdArray = FontReader.GetUInt16Array((EndIndex + f.length - FontReader.Index) >> 1);
Cmap.tables.put(fmtOffset, f);
} else if (format == 6) {
CmapFormat6 f = new CmapFormat6();
f.format = format;
f.length = FontReader.ReadUInt16();
f.language = FontReader.ReadUInt16();
f.firstCode = FontReader.ReadUInt16();
f.entryCount = FontReader.ReadUInt16();
f.glyphIdArray = FontReader.GetUInt16Array(f.entryCount);
Cmap.tables.put(fmtOffset, f);
} else if (format == 12) {
CmapFormat12 f = new CmapFormat12();
f.format = format;
f.reserved = FontReader.ReadUInt16();
f.length = FontReader.ReadUInt32();
f.language = FontReader.ReadUInt32();
f.numGroups = FontReader.ReadUInt32();
f.groups = new ArrayList<>(f.numGroups);
for (int n = 0; n < f.numGroups; ++n) {
f.groups.add(Triple.of(FontReader.ReadUInt32(), FontReader.ReadUInt32(), FontReader.ReadUInt32()));
}
Cmap.tables.put(fmtOffset, f);
}
}
}
}
// 解析表 glyf (字体轮廓数据表)
for (Directory Temp : Directorys) {
if (Temp.tag.equals("glyf")) {
FontReader.Index = Temp.offset;
for (int i = 0; i < Maxp.numGlyphs; ++i) {
FontReader.Index = Temp.offset + Loca.get(i);
short numberOfContours = FontReader.ReadInt16();
if (numberOfContours > 0) {
GlyfLayout g = new GlyfLayout();
g.numberOfContours = numberOfContours;
g.xMin = FontReader.ReadInt16();
g.yMin = FontReader.ReadInt16();
g.xMax = FontReader.ReadInt16();
g.yMax = FontReader.ReadInt16();
g.endPtsOfContours = FontReader.GetUInt16Array(numberOfContours);
g.instructionLength = FontReader.ReadUInt16();
g.instructions = FontReader.GetBytes(g.instructionLength);
int flagLength = g.endPtsOfContours[g.endPtsOfContours.length - 1] + 1;
// 获取轮廓点描述标志
g.flags = new byte[flagLength];
for (int n = 0; n < flagLength; ++n) {
g.flags[n] = FontReader.GetByte();
if ((g.flags[n] & 0x08) != 0x00) {
for (int m = FontReader.ReadUInt8(); m > 0; --m) {
g.flags[++n] = g.flags[n - 1];
}
}
}
// 获取轮廓点描述x轴相对值
g.xCoordinates = new short[flagLength];
for (int n = 0; n < flagLength; ++n) {
short same = (short) ((g.flags[n] & 0x10) != 0 ? 1 : -1);
if ((g.flags[n] & 0x02) != 0) {
g.xCoordinates[n] = (short) (same * FontReader.ReadUInt8());
} else {
g.xCoordinates[n] = same == 1 ? (short) 0 : FontReader.ReadInt16();
}
}
// 获取轮廓点描述y轴相对值
g.yCoordinates = new short[flagLength];
for (int n = 0; n < flagLength; ++n) {
short same = (short) ((g.flags[n] & 0x20) != 0 ? 1 : -1);
if ((g.flags[n] & 0x04) != 0) {
g.yCoordinates[n] = (short) (same * FontReader.ReadUInt8());
} else {
g.yCoordinates[n] = same == 1 ? (short) 0 : FontReader.ReadInt16();
}
}
// 相对坐标转绝对坐标
// for (int n = 1; n < flagLength; ++n) {
// xCoordinates[n] += xCoordinates[n - 1];
// yCoordinates[n] += yCoordinates[n - 1];
// }
Glyf.add(g);
} else {
// 复合字体暂未使用
}
}
}
}
// 建立Unicode&Glyf映射表
for (int i = 0; i < 130000; ++i) {
int gid = GetGlyfIndex(i);
if (gid == 0) continue;
int thisLength = Glyf.get(gid).flags.length;
short[] thisGlyf = new short[thisLength << 1];
System.arraycopy(Glyf.get(gid).xCoordinates, 0, thisGlyf, 0, thisLength);
System.arraycopy(Glyf.get(gid).yCoordinates, 0, thisGlyf, thisLength, thisLength);
UnicodeMap.put(i, thisGlyf);
}
}
/**
* 获取字体信息 (1=字体名称)
*
* @param nameId 传入十进制字体信息索引
* @return 返回查询结果字符串
*/
public String GetNameById(int nameId) {
for (Directory Temp : Directorys) {
if (!Temp.tag.equals("name")) continue;
FontReader.Index = Temp.offset;
break;
}
for (NameRecord record : Name.records) {
if (record.nameID != nameId) continue;
FontReader.Index += Name.stringOffset + record.offset;
return FontReader.ReadStrings(record.length, record.platformID == 1 ? StandardCharsets.UTF_8 : StandardCharsets.UTF_16BE);
}
return "error";
}
/**
* 使用Unicode值查找轮廓索引
*
* @param code 传入Unicode十进制值
* @return 返回十进制轮廓索引
*/
private int GetGlyfIndex(int code) {
if (code == 0) return 0;
int fmtKey = 0;
for (Pair<Integer, Integer> item : pps) {
for (CmapRecord record : Cmap.records) {
if ((item.getLeft() == record.platformID) && (item.getRight() == record.encodingID)) {
fmtKey = record.offset;
break;
}
}
if (fmtKey > 0) break;
}
if (fmtKey == 0) return 0;
int glyfID = 0;
CmapFormat table = Cmap.tables.get(fmtKey);
int fmt = table.format;
if (fmt == 0) {
if (code >= table.glyphIdArray.length) glyfID = 0;
else glyfID = table.glyphIdArray[code] & 0xFF;
} else if (fmt == 4) {
CmapFormat4 tab = (CmapFormat4) table;
if (code > tab.endCode[tab.endCode.length - 1]) return 0;
// 二分法查找数值索引
int start = 0, middle, end = tab.endCode.length - 1;
while (start + 1 < end) {
middle = (start + end) / 2;
if (tab.endCode[middle] <= code) start = middle;
else end = middle;
}
if (tab.endCode[start] < code) ++start;
if (code < tab.startCode[start]) return 0;
if (tab.idRangeOffset[start] != 0) {
glyfID = tab.glyphIdArray[code - tab.startCode[start] + (tab.idRangeOffset[start] >> 1) - (tab.idRangeOffset.length - start)];
} else glyfID = code + tab.idDelta[start];
glyfID &= 0xFFFF;
} else if (fmt == 6) {
CmapFormat6 tab = (CmapFormat6) table;
int index = code - tab.firstCode;
if (index < 0 || index >= tab.glyphIdArray.length) glyfID = 0;
else glyfID = tab.glyphIdArray[index];
} else if (fmt == 12) {
CmapFormat12 tab = (CmapFormat12) table;
if (code > tab.groups.get(tab.numGroups - 1).getMiddle()) return 0;
// 二分法查找数值索引
int start = 0, middle, end = tab.numGroups - 1;
while (start + 1 < end) {
middle = (start + end) / 2;
if (tab.groups.get(middle).getLeft() <= code) start = middle;
else end = middle;
}
if (tab.groups.get(start).getLeft() <= code && code <= tab.groups.get(start).getMiddle()) {
glyfID = tab.groups.get(start).getRight() + code - tab.groups.get(start).getLeft();
}
}
return glyfID;
}
/**
* 使用轮廓数据获取Unicode值
*
* @param inputGlyf 传入short[]轮廓数组
* @return 返回Unicode十进制值
*/
public int GetCodeByGlyf(short[] inputGlyf) {
int unicodeVal = 0;
for (Map.Entry<Integer, short[]> g : UnicodeMap.entrySet()) {
if (inputGlyf.length != g.getValue().length) continue;
int i = inputGlyf.length;
while (i > 0) {
--i;
if (inputGlyf[i] != g.getValue()[i]) {
++i;
break;
}
}
if (i == 0) unicodeVal = g.getKey();
}
return unicodeVal;
}
/**
* 使用Unicode值获取轮廓数据
*
* @param code 传入Unicode十进制值
* @return 返回short[]轮廓数组
*/
public short[] GetGlyfByCode(int code) {
if (code <= 0) return new short[0];
return UnicodeMap.getOrDefault(code, new short[0]);
}
}

602
app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.kt
Unescape View File

@ -1,602 +0,0 @@
package io.legado.app.model.analyzeRule
import io.legado.app.help.JsExtensions
import java.nio.charset.Charset
import kotlin.experimental.and
/**
* 解析TTF字体
* @see <a href="https://docs.microsoft.com/en-us/typography/opentype/spec/">获取详情</a>
* @see <a href="https://photopea.github.io/Typr.js/demo/index.html">基于Javascript的TTF解析器</a>
*/
@ExperimentalUnsignedTypes
class QueryTTF(var Font: ByteArray) : JsExtensions {
private class Header {
var majorVersion: UShort = 0u
var minorVersion: UShort = 0u
var numOfTables: UShort = 0u
var searchRange: UShort = 0u
var entrySelector: UShort = 0u
var rangeShift: UShort = 0u
}
private class Directory {
var tag: String = ""
var checkSum: UInt = 0u
var offset: UInt = 0u
var length: UInt = 0u
}
private class NameLayout {
var format: UShort = 0u
var count: UShort = 0u
var stringOffset: UShort = 0u
var records = ArrayList<NameRecord>()
}
private class NameRecord {
var platformID: UShort = 0u
var encodingID: UShort = 0u
var languageID: UShort = 0u
var nameID: UShort = 0u
var length: UShort = 0u
var offset: UShort = 0u
}
private class HeadLayout {
var majorVersion: UShort = 0u
var minorVersion: UShort = 0u
var fontRevision: UInt = 0u
var checkSumAdjustment: UInt = 0u
var magicNumber: UInt = 0u
var flags: UShort = 0u
var unitsPerEm: UShort = 0u
var created: ULong = 0u
var modified: ULong = 0u
var xMin: Short = 0
var yMin: Short = 0
var xMax: Short = 0
var yMax: Short = 0
var macStyle: UShort = 0u
var lowestRecPPEM: UShort = 0u
var fontDirectionHint: Short = 0
var indexToLocFormat: Short = 0
var glyphDataFormat: Short = 0
}
private class MaxpLayout {
var majorVersion: UShort = 0u
var minorVersion: UShort = 0u
var numGlyphs: UShort = 0u // 字体中的字形数量
var maxPoints: UShort = 0u
var maxContours: UShort = 0u
var maxCompositePoints: UShort = 0u
var maxCompositeContours: UShort = 0u
var maxZones: UShort = 0u
var maxTwilightPoints: UShort = 0u
var maxStorage: UShort = 0u
var maxFunctionDefs: UShort = 0u
var maxInstructionDefs: UShort = 0u
var maxStackElements: UShort = 0u
var maxSizeOfInstructions: UShort = 0u
var maxComponentElements: UShort = 0u
var maxComponentDepth: UShort = 0u
}
private class CmapLayout {
var version: UShort = 0u
var numTables: UShort = 0u
var records = ArrayList<CmapRecord>()
var tables = mutableMapOf<UInt, Any>()
}
private class CmapRecord {
var platformID: UShort = 0u
var encodingID: UShort = 0u
var offset: UInt = 0u
}
private class CmapFormat0 {
var format: UShort = 0u
var length: UShort = 0u
var language: UShort = 0u
var glyphIdArray = ArrayList<Byte>()
}
private class CmapFormat4 {
var format: UShort = 0u
var length: UShort = 0u
var language: UShort = 0u
var segCountX2: UShort = 0u
var searchRange: UShort = 0u
var entrySelector: UShort = 0u
var rangeShift: UShort = 0u
lateinit var endCode: ArrayList<UShort> // UInt16[]
var reservedPad: UShort = 0u
lateinit var startCode: ArrayList<UShort> // UInt16[]
lateinit var idDelta: ArrayList<Short>
lateinit var idRangeOffset: ArrayList<UShort> // UInt16[]
var glyphIdArray = ArrayList<UShort>()
}
private class CmapFormat6 {
var format: UShort = 0u
var length: UShort = 0u
var language: UShort = 0u
var firstCode: UShort = 0u
var entryCount: UShort = 0u
var glyphIdArray = ArrayList<UShort>()
}
private class CmapFormat12 {
var format: UShort = 0u
var reserved: UShort = 0u
var length: UInt = 0u
var language: UInt = 0u
var numGroups: UInt = 0u
lateinit var groups: ArrayList<Triple<UInt, UInt, UInt>>
}
private class GlyfLayout {
var numberOfContours: Short = 0
var xMin: Short = 0
var yMin: Short = 0
var xMax: Short = 0
var yMax: Short = 0
lateinit var endPtsOfContours: ArrayList<UShort> // UInt16[]
var instructionLength: UShort = 0u // UInt16
lateinit var instructions: ArrayList<Byte>
lateinit var flags: ArrayList<Byte>
lateinit var xCoordinates: ArrayList<Short>
lateinit var yCoordinates: ArrayList<Short>
}
private class ByteArrayReader(var Buffer: ByteArray, var Index: Int) {
fun ReadUIntX(len: Long): ULong {
var result: ULong = 0u
for (i in 0 until len) {
result.shl(8)
result = result or Buffer[Index++].toULong()
}
return result
}
fun ReadUInt64(): ULong {
return ReadUIntX(8)
}
fun ReadInt64(): Long {
return ReadUIntX(8).toLong()
}
fun ReadUInt32(): UInt {
return ReadUIntX(4).toUInt()
}
fun ReadInt32(): Int {
return ReadUIntX(4).toInt()
}
fun ReadUInt16(): UShort {
return ReadUIntX(2).toUShort()
}
fun ReadInt16(): Short {
return ReadUIntX(2).toShort()
}
fun ReadStrings(len: Int, charset: Charset): String {
if (len <= 0) return ""
val result = ByteArray(len)
for (i in 0 until len) {
result[i] = Buffer[Index++]
}
return result.toString(charset)
}
fun GetByte(): Byte {
return Buffer[Index++]
}
fun GetBytes(len: Int): ArrayList<Byte> {
if (len <= 0) return ArrayList(0)
val result = ArrayList<Byte>(len)
for (i in 0 until len) {
result[i] = Buffer[Index++]
}
return result
}
fun GetUInt16Array(len: Int): ArrayList<UShort> {
if (len <= 0) return ArrayList(0)
val result = ArrayList<UShort>(len)
for (i in 0 until len) {
result[i] = ReadUInt16()
}
return result
}
fun GetInt16Array(len: Int): ArrayList<Short> {
if (len <= 0) return ArrayList(0)
val result = ArrayList<Short>(len)
for (i in 0 until len) {
result[i] = ReadInt16()
}
return result
}
}
private var FontReader: ByteArrayReader
private var fileHeader = Header()
private var directorys = ArrayList<Directory>()
private var name = NameLayout()
private var head = HeadLayout()
private var maxp = MaxpLayout()
private var loca = ArrayList<UInt>()
private var cmap = CmapLayout()
private var glyf = ArrayList<GlyfLayout>()
private var unicodeMap = mutableMapOf<Int, ArrayList<Short>>()
init {
FontReader = ByteArrayReader(Font, 0)
// 获取文件头
fileHeader.majorVersion = FontReader.ReadUInt16()
fileHeader.minorVersion = FontReader.ReadUInt16()
fileHeader.numOfTables = FontReader.ReadUInt16()
fileHeader.searchRange = FontReader.ReadUInt16()
fileHeader.entrySelector = FontReader.ReadUInt16()
fileHeader.rangeShift = FontReader.ReadUInt16()
// 获取目录
for (i in 0 until fileHeader.numOfTables.toInt()) {
val tag = FontReader.ReadStrings(4, Charsets.US_ASCII)
val t = Directory()
t.tag = tag
t.checkSum = FontReader.ReadUInt32()
t.offset = FontReader.ReadUInt32()
t.length = FontReader.ReadUInt32()
directorys.add(t)
}
// 解析表 name (字体信息,包含版权、名称、作者等...)
for (Temp in directorys) {
if (Temp.tag == "name") {
FontReader.Index = Temp.offset.toInt()
name.format = FontReader.ReadUInt16()
name.count = FontReader.ReadUInt16()
name.stringOffset = FontReader.ReadUInt16()
for (i in 0 until name.count.toInt()) {
val record = NameRecord()
record.platformID = FontReader.ReadUInt16()
record.encodingID = FontReader.ReadUInt16()
record.languageID = FontReader.ReadUInt16()
record.nameID = FontReader.ReadUInt16()
record.length = FontReader.ReadUInt16()
record.offset = FontReader.ReadUInt16()
name.records.add(record)
}
}
}
// 解析表 head (获取 head.indexToLocFormat)
for (Temp in directorys) {
if (Temp.tag == "head") {
FontReader.Index = Temp.offset.toInt()
head.majorVersion = FontReader.ReadUInt16()
head.minorVersion = FontReader.ReadUInt16()
head.fontRevision = FontReader.ReadUInt32()
head.checkSumAdjustment = FontReader.ReadUInt32()
head.magicNumber = FontReader.ReadUInt32()
head.flags = FontReader.ReadUInt16()
head.unitsPerEm = FontReader.ReadUInt16()
head.created = FontReader.ReadUInt64()
head.modified = FontReader.ReadUInt64()
head.xMin = FontReader.ReadInt16()
head.yMin = FontReader.ReadInt16()
head.xMax = FontReader.ReadInt16()
head.yMax = FontReader.ReadInt16()
head.macStyle = FontReader.ReadUInt16()
head.lowestRecPPEM = FontReader.ReadUInt16()
head.fontDirectionHint = FontReader.ReadInt16()
head.indexToLocFormat = FontReader.ReadInt16()
head.glyphDataFormat = FontReader.ReadInt16()
}
}
// 解析表 maxp (获取 maxp.numGlyphs)
for (Temp in directorys) {
if (Temp.tag == "maxp") {
FontReader.Index = Temp.offset.toInt()
maxp.majorVersion = FontReader.ReadUInt16()
maxp.minorVersion = FontReader.ReadUInt16()
maxp.numGlyphs = FontReader.ReadUInt16()
maxp.maxPoints = FontReader.ReadUInt16()
maxp.maxContours = FontReader.ReadUInt16()
maxp.maxCompositePoints = FontReader.ReadUInt16()
maxp.maxCompositeContours = FontReader.ReadUInt16()
maxp.maxZones = FontReader.ReadUInt16()
maxp.maxTwilightPoints = FontReader.ReadUInt16()
maxp.maxStorage = FontReader.ReadUInt16()
maxp.maxFunctionDefs = FontReader.ReadUInt16()
maxp.maxInstructionDefs = FontReader.ReadUInt16()
maxp.maxStackElements = FontReader.ReadUInt16()
maxp.maxSizeOfInstructions = FontReader.ReadUInt16()
maxp.maxComponentElements = FontReader.ReadUInt16()
maxp.maxComponentDepth = FontReader.ReadUInt16()
}
}
// 解析表 loca (轮廓数据偏移地址表)
for (Temp in directorys) {
if (Temp.tag == "loca") {
FontReader.Index = Temp.offset.toInt()
val offset: UInt = if (head.indexToLocFormat.toInt() == 0) 2u else 4u
var i: UInt = 0u
while (i < Temp.length) {
loca.add(if (offset == 2u) FontReader.ReadUInt16().toUInt().shl(1) else FontReader.ReadUInt32())
i += offset
}
}
}
// 解析表 cmap (Unicode编码轮廓索引对照表)
for (Temp in directorys) {
if (Temp.tag == "cmap") {
FontReader.Index = Temp.offset.toInt()
cmap.version = FontReader.ReadUInt16()
cmap.numTables = FontReader.ReadUInt16()
for (i in 0 until cmap.numTables.toInt()) {
val record = CmapRecord()
record.platformID = FontReader.ReadUInt16()
record.encodingID = FontReader.ReadUInt16()
record.offset = FontReader.ReadUInt32()
cmap.records.add(record)
}
for (i in 0 until cmap.numTables.toInt()) {
val fmtOffset = cmap.records[i].offset
FontReader.Index = (Temp.offset + fmtOffset).toInt()
val EndIndex = FontReader.Index
val format = FontReader.ReadUInt16()
if (cmap.tables.contains(fmtOffset.toInt())) continue
when {
format.equals(0) -> {
val fmt = CmapFormat0()
fmt.format = format
fmt.length = FontReader.ReadUInt16()
fmt.language = FontReader.ReadUInt16()
fmt.glyphIdArray = FontReader.GetBytes(fmt.length.toInt() - 6)
cmap.tables[fmtOffset] = fmt
}
format.equals(4) -> {
val fmt = CmapFormat4()
fmt.format = format
fmt.length = FontReader.ReadUInt16()
fmt.language = FontReader.ReadUInt16()
fmt.segCountX2 = FontReader.ReadUInt16()
val segCount = fmt.segCountX2.toInt() / 2
fmt.searchRange = FontReader.ReadUInt16()
fmt.entrySelector = FontReader.ReadUInt16()
fmt.rangeShift = FontReader.ReadUInt16()
fmt.endCode = FontReader.GetUInt16Array(segCount)
fmt.reservedPad = FontReader.ReadUInt16()
fmt.startCode = FontReader.GetUInt16Array(segCount)
fmt.idDelta = FontReader.GetInt16Array(segCount)
fmt.idRangeOffset = FontReader.GetUInt16Array(segCount)
fmt.glyphIdArray = FontReader.GetUInt16Array((fmt.length.toInt() - (FontReader.Index - EndIndex)) / 2)
cmap.tables[fmtOffset] = fmt
}
format.equals(6) -> {
val fmt = CmapFormat6()
fmt.format = format
fmt.length = FontReader.ReadUInt16()
fmt.language = FontReader.ReadUInt16()
fmt.firstCode = FontReader.ReadUInt16()
fmt.entryCount = FontReader.ReadUInt16()
fmt.glyphIdArray = FontReader.GetUInt16Array(fmt.entryCount.toInt())
cmap.tables[fmtOffset] = fmt
}
format.equals(12) -> {
val fmt = CmapFormat12()
fmt.format = format
fmt.reserved = FontReader.ReadUInt16()
fmt.length = FontReader.ReadUInt32()
fmt.language = FontReader.ReadUInt32()
fmt.numGroups = FontReader.ReadUInt32()
for (n in 0 until fmt.numGroups.toLong()) {
fmt.groups.add(Triple(FontReader.ReadUInt32(), FontReader.ReadUInt32(), FontReader.ReadUInt32()))
}
cmap.tables[fmtOffset] = fmt
}
}
}
}
}
// 解析表 glyf (字体轮廓数据表)
for (Temp in directorys) {
if (Temp.tag == "glyf") {
FontReader.Index = Temp.offset.toInt()
for (i in 0 until maxp.numGlyphs.toInt()) {
FontReader.Index = (Temp.offset + loca[i]).toInt()
val g = GlyfLayout()
g.numberOfContours = FontReader.ReadInt16()
g.xMin = FontReader.ReadInt16()
g.yMin = FontReader.ReadInt16()
g.xMax = FontReader.ReadInt16()
g.yMax = FontReader.ReadInt16()
if (g.numberOfContours > 0) {
g.endPtsOfContours = FontReader.GetUInt16Array(g.numberOfContours.toInt())
g.instructionLength = FontReader.ReadUInt16()
g.instructions = FontReader.GetBytes(g.instructionLength.toInt())
val flagLength = g.endPtsOfContours.last().toInt() + 1
// 获取轮廓点描述标志
g.flags = ArrayList(flagLength)
var n = 0
while (n < flagLength) {
g.flags[n] = FontReader.GetByte()
if ((g.flags[n].and(0x08)).toInt() != 0x00) {
for (m in FontReader.GetByte() downTo 1) {
g.flags[++n] = g.flags[n - 1]
}
}
++n
}
// 获取轮廓点描述x轴相对值
g.xCoordinates = ArrayList(flagLength)
for (m in 0 until flagLength) {
val same = if ((g.flags[m].and(0x10)).toInt() != 0) 1 else -1
if ((g.flags[m].and(0x02)).toInt() != 0) {
g.xCoordinates[m] = (same * FontReader.GetByte()).toShort()
} else {
g.xCoordinates[m] = if (same == 1) 0 else FontReader.ReadInt16()
}
}
// 获取轮廓点描述y轴相对值
g.yCoordinates = ArrayList(flagLength)
for (m in 0 until flagLength) {
val same = if ((g.flags[m].and(0x20)).toInt() != 0) 1 else -1
if ((g.flags[m].and(0x04)).toInt() != 0) {
g.yCoordinates[n] = (same * FontReader.GetByte()).toShort()
} else {
g.yCoordinates[n] = if (same == 1) 0 else FontReader.ReadInt16()
}
}
/*
// 相对坐标转绝对坐标 (因不绘制字体,这里用不上)
for(m in 1 until flagLength)
{
g.xCoordinates[m] = (g.xCoordinates[m] + g.xCoordinates[m - 1]).toShort()
g.yCoordinates[m] = (g.yCoordinates[m] + g.yCoordinates[m - 1]).toShort()
}
*/
glyf.add(g)
} else {
// 复合字体暂未使用
}
}
}
}
// 建立Unicode&Glyf映射表
for (i in 0..130000) {
val gid = GetGlyfIndex(i).toInt()
if (gid == 0) continue
if (unicodeMap.containsKey(gid)) continue
val thisGlyf = ArrayList<Short>()
thisGlyf.addAll(glyf[gid].xCoordinates)
thisGlyf.addAll(glyf[gid].yCoordinates)
unicodeMap[i] = thisGlyf
}
}
/**
* 获取字体信息 (默认获取字体名称,索引位1)
*/
fun GetNameById(nameId: Int = 1): String {
for (Temp in directorys) {
if (Temp.tag != "name") continue
FontReader.Index = Temp.offset.toInt()
break
}
for (record in name.records) {
if (record.nameID.toInt() != nameId) continue
FontReader.Index = FontReader.Index + (name.stringOffset + record.offset).toInt()
return FontReader.ReadStrings(record.length.toInt(), if (record.platformID.toInt() == 1) Charsets.UTF_8 else Charsets.UTF_16BE)
}
return "error"
}
var pps = arrayListOf<Pair<UShort, UShort>>(Pair(3u, 10u), Pair(0u, 4u), Pair(3u, 1u), Pair(1u, 0u), Pair(0u, 3u), Pair(0u, 1u))
/**
* 使用Unicode值查找轮廓索引
*/
private fun GetGlyfIndex(code: Int): Long {
if (code == 0) return 0
var fmtKey: UInt = 0u
for (item in pps) {
for (record in cmap.records) {
if ((item.first == record.platformID) && (item.second == record.encodingID)) {
fmtKey = record.offset
break
}
}
if (fmtKey > 0u) break
}
if (fmtKey == 0u) return 0
var glyfID: Long = 0
if (cmap.tables[fmtKey] is CmapFormat0) {
val tab = cmap.tables[fmtKey] as CmapFormat0
if (code >= tab.glyphIdArray.size) glyfID = 0
else glyfID = tab.glyphIdArray[code].toLong()
} else if (cmap.tables[fmtKey] is CmapFormat4) {
val tab = cmap.tables[fmtKey] as CmapFormat4
if (code > tab.endCode.last().toInt()) return 0
// 二分法查找数值索引
var start = 0
var middle: Int
var end = tab.endCode.size - 1
while (start + 1 < end) {
middle = (start + end) / 2
if (tab.endCode[middle] <= code.toUInt()) start = middle
else end = middle
}
if (tab.endCode[start] < code.toUInt()) ++start
if (code.toUInt() < tab.startCode[start]) return 0
glyfID = if (tab.idRangeOffset[start].toInt() != 0) {
tab.glyphIdArray[code - tab.startCode[start].toInt() + (tab.idRangeOffset[start].toInt() / 2) - (tab.idRangeOffset.size - start)].toLong()
} else (code + tab.idDelta[start]).toLong()
glyfID = glyfID.and(0xFFFF)
} else if (cmap.tables[fmtKey] is CmapFormat6) {
val tab = cmap.tables[fmtKey] as CmapFormat6
val index = code - tab.firstCode.toInt()
glyfID = if (index < 0 || index >= tab.glyphIdArray.size) 0 else tab.glyphIdArray[index].toLong()
} else if (cmap.tables[fmtKey] is CmapFormat12) {
val tab = (cmap.tables[fmtKey] as CmapFormat12)
if (code > tab.groups.last().second.toInt()) return 0
// 二分法查找数值索引
var start = 0
var middle: Int
var end = tab.groups.size - 1
while (start + 1 < end) {
middle = (start + end) / 2
if (tab.groups[middle].first.toInt() <= code) start = middle
else end = middle
}
if (tab.groups[start].first.toInt() <= code && code <= tab.groups[start].second.toInt()) {
glyfID = (tab.groups[start].third.toInt() + code - tab.groups[start].first.toInt()).toLong()
}
}
return glyfID
}
/**
* 使用轮廓数据获取Unicode值
*/
public fun GetCodeByGlyf(inputGlyf: List<Short>): Int {
var unicodeVal = 0
if (inputGlyf.isEmpty()) return 0
for (g in unicodeMap) {
if (inputGlyf.size != g.value.size) continue
var isFound = true
for (i in inputGlyf.indices) {
if (inputGlyf[i] != g.value[i]) {
isFound = false
break
}
}
if (isFound) unicodeVal = g.key
}
return unicodeVal
}
/**
* 使用Unicode值获取轮廓数据
*/
public fun GetGlyfByCode(code: Int): ArrayList<Short> {
if (code <= 0) return ArrayList()
return unicodeMap.getOrDefault(code, ArrayList())
}
}

8
app/src/main/java/io/legado/app/model/webBook/BookContent.kt
Unescape View File

@ -118,10 +118,12 @@ object BookContent {
if (correctFont != null && font != null) { if (correctFont != null && font != null) {
val queryTTF = QueryTTF(font!!) val queryTTF = QueryTTF(font!!)
val cQueryTTF = QueryTTF(correctFont!!) val cQueryTTF = QueryTTF(correctFont!!)
val contentArray = contentStr.toStringArray() val contentArray = contentStr.toCharArray()
contentArray.forEachIndexed { index, s -> contentArray.forEachIndexed { index, s ->
val code = cQueryTTF.GetCodeByGlyf(queryTTF.GetGlyfByCode(s.toInt())) if(s> 58000.toChar()){
contentArray[index] = code.toString() val code = cQueryTTF.GetCodeByGlyf(queryTTF.GetGlyfByCode(s.toInt()))
contentArray[index] = code.toChar()
}
} }
contentStr = contentArray.joinToString("") contentStr = contentArray.joinToString("")
} }

Write Preview
Loading…
Cancel
Save