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更新编码检测规则 #648

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更新编码检测规则 #648

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39 changes: 24 additions & 15 deletions src/main/java/io/legado/app/utils/EncodingDetect.kt
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Original file line number Diff line number Diff line change
@@ -1,40 +1,49 @@
package io.legado.app.utils

import android.text.TextUtils
import io.legado.app.lib.icu4j.CharsetDetector
import org.jsoup.Jsoup
import java.io.File
import java.io.FileInputStream
import java.nio.charset.StandardCharsets
import java.util.*

/**
* 自动获取文件的编码
* */
@Suppress("MemberVisibilityCanBePrivate", "unused")
object EncodingDetect {

fun getHtmlEncode(bytes: ByteArray): String? {
private val headTagRegex = "(?i)<head>[\\s\\S]*?</head>".toRegex()
private val headOpenBytes = "<head>".toByteArray()
private val headCloseBytes = "</head>".toByteArray()

fun getHtmlEncode(bytes: ByteArray): String {
try {
val doc = Jsoup.parse(String(bytes, StandardCharsets.UTF_8))
var head: String? = null
val startIndex = bytes.indexOf(headOpenBytes)
if (startIndex > -1) {
val endIndex = bytes.indexOf(headCloseBytes, startIndex)
if (endIndex > -1) {
head = String(bytes.copyOfRange(startIndex, endIndex + headCloseBytes.size))
}
}
val doc = Jsoup.parseBodyFragment(head ?: headTagRegex.find(String(bytes))!!.value)
val metaTags = doc.getElementsByTag("meta")
var charsetStr: String
for (metaTag in metaTags) {
charsetStr = metaTag.attr("charset")
if (!charsetStr.isEmpty()) {
if (!TextUtils.isEmpty(charsetStr)) {
return charsetStr
}
val content = metaTag.attr("content")
val httpEquiv = metaTag.attr("http-equiv")
if (httpEquiv.lowercase(Locale.getDefault()) == "content-type") {
charsetStr = if (content.lowercase(Locale.getDefault()).contains("charset")) {
content.substring(
content.lowercase(Locale.getDefault())
.indexOf("charset") + "charset=".length
)
if (httpEquiv.equals("content-type", true)) {
val content = metaTag.attr("content")
val idx = content.indexOf("charset=", ignoreCase = true)
charsetStr = if (idx > -1) {
content.substring(idx + "charset=".length)
} else {
content.substring(content.lowercase(Locale.getDefault()).indexOf(";") + 1)
content.substringAfter(";")
}
if (!charsetStr.isEmpty()) {
if (!TextUtils.isEmpty(charsetStr)) {
return charsetStr
}
}
Expand Down Expand Up @@ -75,4 +84,4 @@ object EncodingDetect {
}
return byteArray
}
}
}