MimeTypeMap is case-sensitive prior to Android O

https://android-review.googlesource.com/251120

app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader2.kt

@@ -62,7 +62,7 @@ abstract class PageLoader2(private val gid: Long, var startPage: Int) : PageLoad
     protected abstract fun getImageExtension(index: Int): String
 
     fun getImageFilename(index: Int): String {
-        return "$title - ${index + 1}.${getImageExtension(index)}"
+        return "$title - ${index + 1}.${getImageExtension(index).lowercase()}"
     }
 
     abstract fun save(index: Int, file: UniFile): Boolean

app/src/main/kotlin/com/hippo/ehviewer/spider/ComicInfo.kt

@@ -76,7 +76,7 @@ fun GalleryInfo.getComicInfo(): ComicInfo {
     }
     return ComicInfo(
         series = title,
-        alternateSeries = titleJpn.takeUnless { it.isNullOrBlank() },
+        alternateSeries = titleJpn?.ifBlank { null },
         writer = groups.ifEmpty { null },
         penciller = artists.ifEmpty { null },
         genre = otherTags.ifEmpty { null },

app/src/main/kotlin/com/hippo/ehviewer/ui/settings/AdvancedScreen.kt

@@ -169,7 +169,7 @@ fun AdvancedScreen(navigator: DestinationsNavigator) {
                     userAgent = dialogState.awaitInputText(
                         initial = userAgent,
                         title = userAgentTitle,
-                    ).trim().takeUnless { it.isBlank() } ?: CHROME_USER_AGENT
+                    ).trim().ifBlank { null } ?: CHROME_USER_AGENT
                 }
             }
             val exportFailed = stringResource(id = R.string.settings_advanced_export_data_failed)

app/src/main/kotlin/com/hippo/ehviewer/util/FileUtils.kt

@@ -129,7 +129,7 @@ object FileUtils {
      * @return null for can't find extension
      */
     fun getExtensionFromFilename(filename: String?) =
-        filename?.substringAfterLast('.', "").takeUnless { it.isNullOrEmpty() }
+        filename?.substringAfterLast('.', "")?.ifEmpty { null }
 
     /**
      * Get name from filename
@@ -138,7 +138,7 @@ object FileUtils {
      * @return null for start with . dot
      */
     fun getNameFromFilename(filename: String?) =
-        filename?.substringBeforeLast('.').takeUnless { it.isNullOrEmpty() }
+        filename?.substringBeforeLast('.')?.ifEmpty { null }
 
     /**
      * Create a temp file, you need to delete it by you self.

app/src/main/kotlin/com/hippo/unifile/RawFile.kt

@@ -21,7 +21,6 @@ import android.os.ParcelFileDescriptor.open
 import android.os.ParcelFileDescriptor.parseMode
 import android.webkit.MimeTypeMap
 import java.io.File
-import java.util.Locale
 
 class RawFile(override val parent: RawFile?, private var file: File) : UniFile {
 
@@ -71,7 +70,8 @@ class RawFile(override val parent: RawFile?, private var file: File) : UniFile {
         get() = if (file.isDirectory) {
             null
         } else {
-            getTypeForName(file.name)
+            val extension = file.extension.ifEmpty { null }?.lowercase()
+            MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension) ?: "application/octet-stream"
         }
     override val isDirectory: Boolean
         get() = file.isDirectory
@@ -130,15 +130,3 @@ class RawFile(override val parent: RawFile?, private var file: File) : UniFile {
 
     override fun openFileDescriptor(mode: String): ParcelFileDescriptor = open(file, parseMode(mode))
 }
-
-private fun getTypeForName(name: String): String {
-    val lastDot = name.lastIndexOf('.')
-    if (lastDot >= 0) {
-        val extension = name.substring(lastDot + 1).lowercase(Locale.getDefault())
-        val mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension)
-        if (mime != null) {
-            return mime
-        }
-    }
-    return "application/octet-stream"
-}

app/src/main/kotlin/com/hippo/unifile/TreeDocumentFile.kt

@@ -54,7 +54,7 @@ class TreeDocumentFile(
         if (child != null) {
             if (child.isFile) return child
         } else {
-            val extension = displayName.substringAfterLast('.', "")
+            val extension = displayName.substringAfterLast('.', "").ifEmpty { null }?.lowercase()
             val mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension) ?: "application/octet-stream"
             val result = DocumentsContractApi21.createFile(uri, mimeType, displayName)
             if (result != null) {