|
|
|
|
@ -9,9 +9,17 @@ import io.legado.app.data.entities.TxtTocRule |
|
|
|
|
import io.legado.app.utils.* |
|
|
|
|
import java.io.File |
|
|
|
|
import java.io.RandomAccessFile |
|
|
|
|
import java.nio.charset.Charset |
|
|
|
|
import java.util.regex.Matcher |
|
|
|
|
import java.util.regex.Pattern |
|
|
|
|
|
|
|
|
|
object AnalyzeTxtFile { |
|
|
|
|
private const val folderName = "bookTxt" |
|
|
|
|
private const val BLANK: Byte = 0x0a |
|
|
|
|
//默认从文件中获取数据的长度 |
|
|
|
|
private const val BUFFER_SIZE = 512 * 1024 |
|
|
|
|
//没有标题的时候，每个章节的最大长度 |
|
|
|
|
private const val MAX_LENGTH_WITH_NO_CHAPTER = 10 * 1024 |
|
|
|
|
private val cacheFolder: File by lazy { |
|
|
|
|
val rootFile = App.INSTANCE.getExternalFilesDir(null) |
|
|
|
|
?: App.INSTANCE.externalCacheDir |
|
|
|
|
@ -19,7 +27,7 @@ object AnalyzeTxtFile { |
|
|
|
|
FileUtils.createFileIfNotExist(rootFile, subDirs = *arrayOf(folderName)) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
fun analyze(context: Context, book: Book) { |
|
|
|
|
fun analyze(context: Context, book: Book): ArrayList<BookChapter> { |
|
|
|
|
val uri = Uri.parse(book.bookUrl) |
|
|
|
|
val bookFile = FileUtils.getFile(cacheFolder, book.originName, subDirs = *arrayOf()) |
|
|
|
|
if (!bookFile.exists()) { |
|
|
|
|
@ -28,26 +36,177 @@ object AnalyzeTxtFile { |
|
|
|
|
bookFile.writeBytes(it) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
book.charset = EncodingDetect.getEncode(bookFile) |
|
|
|
|
val charset = charset(EncodingDetect.getEncode(bookFile)) |
|
|
|
|
book.charset = charset.name() |
|
|
|
|
val toc = arrayListOf<BookChapter>() |
|
|
|
|
//获取文件流 |
|
|
|
|
val bookStream = RandomAccessFile(bookFile, "r") |
|
|
|
|
val tocRule = getTocRule(bookStream) |
|
|
|
|
val rulePattern = getTocRule(bookStream, charset) |
|
|
|
|
|
|
|
|
|
//加载章节 |
|
|
|
|
val buffer = ByteArray(BUFFER_SIZE) |
|
|
|
|
//获取到的块起始点，在文件中的位置 |
|
|
|
|
var curOffset: Long = 0 |
|
|
|
|
//block的个数 |
|
|
|
|
var blockPos = 0 |
|
|
|
|
//读取的长度 |
|
|
|
|
var length: Int |
|
|
|
|
var allLength = 0 |
|
|
|
|
|
|
|
|
|
//获取文件中的数据到buffer，直到没有数据为止 |
|
|
|
|
while (bookStream.read(buffer, 0, buffer.size).also { length = it } > 0) { |
|
|
|
|
++blockPos |
|
|
|
|
//如果存在Chapter |
|
|
|
|
if (rulePattern != null) { //将数据转换成String |
|
|
|
|
var blockContent = String(buffer, 0, length, charset) |
|
|
|
|
val lastN = blockContent.lastIndexOf("\n") |
|
|
|
|
if (lastN != 0) { |
|
|
|
|
blockContent = blockContent.substring(0, lastN) |
|
|
|
|
length = blockContent.toByteArray(charset).size |
|
|
|
|
allLength += length |
|
|
|
|
bookStream.seek(allLength.toLong()) |
|
|
|
|
} |
|
|
|
|
//当前Block下使过的String的指针 |
|
|
|
|
var seekPos = 0 |
|
|
|
|
//进行正则匹配 |
|
|
|
|
val matcher: Matcher = rulePattern.matcher(blockContent) |
|
|
|
|
//如果存在相应章节 |
|
|
|
|
while (matcher.find()) { //获取匹配到的字符在字符串中的起始位置 |
|
|
|
|
val chapterStart = matcher.start() |
|
|
|
|
//如果 seekPos == 0 && nextChapterPos != 0 表示当前block处前面有一段内容 |
|
|
|
|
//第一种情况一定是序章 第二种情况可能是上一个章节的内容 |
|
|
|
|
if (seekPos == 0 && chapterStart != 0) { //获取当前章节的内容 |
|
|
|
|
val chapterContent = blockContent.substring(seekPos, chapterStart) |
|
|
|
|
//设置指针偏移 |
|
|
|
|
seekPos += chapterContent.length |
|
|
|
|
if (toc.size == 0) { //如果当前没有章节，那么就是序章 |
|
|
|
|
//加入简介 |
|
|
|
|
book.intro = chapterContent |
|
|
|
|
//创建当前章节 |
|
|
|
|
val curChapter = BookChapter() |
|
|
|
|
curChapter.title = matcher.group() |
|
|
|
|
curChapter.start = chapterContent.toByteArray(charset).size.toLong() |
|
|
|
|
toc.add(curChapter) |
|
|
|
|
} else { //否则就block分割之后，上一个章节的剩余内容 |
|
|
|
|
//获取上一章节 |
|
|
|
|
val lastChapter = toc.last() |
|
|
|
|
//将当前段落添加上一章去 |
|
|
|
|
lastChapter.end = |
|
|
|
|
lastChapter.end!! + chapterContent.toByteArray(charset).size |
|
|
|
|
//创建当前章节 |
|
|
|
|
val curChapter = BookChapter() |
|
|
|
|
curChapter.title = matcher.group() |
|
|
|
|
curChapter.start = lastChapter.end |
|
|
|
|
toc.add(curChapter) |
|
|
|
|
} |
|
|
|
|
} else { //是否存在章节 |
|
|
|
|
if (toc.size != 0) { //获取章节内容 |
|
|
|
|
val chapterContent = blockContent.substring(seekPos, matcher.start()) |
|
|
|
|
seekPos += chapterContent.length |
|
|
|
|
//获取上一章节 |
|
|
|
|
val lastChapter = toc.last() |
|
|
|
|
lastChapter.end = |
|
|
|
|
lastChapter.start!! + chapterContent.toByteArray(charset).size |
|
|
|
|
//创建当前章节 |
|
|
|
|
val curChapter = BookChapter() |
|
|
|
|
curChapter.title = matcher.group() |
|
|
|
|
curChapter.start = lastChapter.end |
|
|
|
|
toc.add(curChapter) |
|
|
|
|
} else { //如果章节不存在则创建章节 |
|
|
|
|
val curChapter = BookChapter() |
|
|
|
|
curChapter.title = matcher.group() |
|
|
|
|
curChapter.start = 0L |
|
|
|
|
curChapter.end = 0L |
|
|
|
|
toc.add(curChapter) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} else { //进行本地虚拟分章 |
|
|
|
|
//章节在buffer的偏移量 |
|
|
|
|
var chapterOffset = 0 |
|
|
|
|
//当前剩余可分配的长度 |
|
|
|
|
var strLength = length |
|
|
|
|
//分章的位置 |
|
|
|
|
var chapterPos = 0 |
|
|
|
|
while (strLength > 0) { |
|
|
|
|
++chapterPos |
|
|
|
|
//是否长度超过一章 |
|
|
|
|
if (strLength > MAX_LENGTH_WITH_NO_CHAPTER) { //在buffer中一章的终止点 |
|
|
|
|
var end = length |
|
|
|
|
//寻找换行符作为终止点 |
|
|
|
|
for (i in chapterOffset + MAX_LENGTH_WITH_NO_CHAPTER until length) { |
|
|
|
|
if (buffer[i] == BLANK) { |
|
|
|
|
end = i |
|
|
|
|
break |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
val chapter = BookChapter() |
|
|
|
|
chapter.title = "第${blockPos}章($chapterPos)" |
|
|
|
|
chapter.start = curOffset + chapterOffset + 1 |
|
|
|
|
chapter.end = curOffset + end |
|
|
|
|
toc.add(chapter) |
|
|
|
|
//减去已经被分配的长度 |
|
|
|
|
strLength -= (end - chapterOffset) |
|
|
|
|
//设置偏移的位置 |
|
|
|
|
chapterOffset = end |
|
|
|
|
} else { |
|
|
|
|
val chapter = BookChapter() |
|
|
|
|
chapter.title = "第" + blockPos + "章" + "(" + chapterPos + ")" |
|
|
|
|
chapter.start = curOffset + chapterOffset + 1 |
|
|
|
|
chapter.end = curOffset + length |
|
|
|
|
toc.add(chapter) |
|
|
|
|
strLength = 0 |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
//block的偏移点 |
|
|
|
|
curOffset += length.toLong() |
|
|
|
|
|
|
|
|
|
if (rulePattern != null) { //设置上一章的结尾 |
|
|
|
|
val lastChapter = toc.last() |
|
|
|
|
lastChapter.end = curOffset |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
//当添加的block太多的时候，执行GC |
|
|
|
|
//当添加的block太多的时候，执行GC |
|
|
|
|
if (blockPos % 15 == 0) { |
|
|
|
|
System.gc() |
|
|
|
|
System.runFinalization() |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
for (i in toc.indices) { |
|
|
|
|
val bean = toc[i] |
|
|
|
|
bean.index = i |
|
|
|
|
bean.bookUrl = book.bookUrl |
|
|
|
|
bean.url = (MD5Utils.md5Encode16(book.originName + i + bean.title) ?: "") |
|
|
|
|
} |
|
|
|
|
bookStream.close() |
|
|
|
|
|
|
|
|
|
System.gc() |
|
|
|
|
System.runFinalization() |
|
|
|
|
return toc |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
private fun getTocRule(bookStream: RandomAccessFile): String? { |
|
|
|
|
private fun getTocRule(bookStream: RandomAccessFile, charset: Charset): Pattern? { |
|
|
|
|
val tocRules = getTocRules() |
|
|
|
|
var tocRule: String? = null |
|
|
|
|
var rulePattern: Pattern? = null |
|
|
|
|
//首先获取128k的数据 |
|
|
|
|
val buffer = ByteArray(10240) |
|
|
|
|
val buffer = ByteArray(BUFFER_SIZE / 4) |
|
|
|
|
val length = bookStream.read(buffer, 0, buffer.size) |
|
|
|
|
for (str in tocRules) { |
|
|
|
|
|
|
|
|
|
val content = String(buffer, 0, length, charset) |
|
|
|
|
for (tocRule in tocRules) { |
|
|
|
|
val pattern = Pattern.compile(tocRule.rule, Pattern.MULTILINE) |
|
|
|
|
val matcher = pattern.matcher(content) |
|
|
|
|
if (matcher.find()) { |
|
|
|
|
rulePattern = pattern |
|
|
|
|
break |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
return tocRule |
|
|
|
|
bookStream.seek(0) |
|
|
|
|
return rulePattern |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
private fun getTocRules(): List<TxtTocRule> { |
|
|
|
|
|
kunfei
5 years ago