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Tweak saved filename byte size limiting logic

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Based on comment from 6940ad3fd9
This commit is contained in:
arkon 2020-03-07 13:15:21 -05:00
parent 5e9496ef36
commit 1c978f64b1
2 changed files with 26 additions and 3 deletions
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8
app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt
View file

@ -21,6 +21,8 @@ import eu.kanade.tachiyomi.ui.reader.loader.DownloadPageLoader
import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
import eu.kanade.tachiyomi.util.lang.byteSize
import eu.kanade.tachiyomi.util.lang.takeBytes
import eu.kanade.tachiyomi.util.storage.DiskUtil
import eu.kanade.tachiyomi.util.system.ImageUtil
import java.io.File
@ -450,7 +452,7 @@ class ReaderPresenter(
// Build destination file.
val filenameSuffix = " - ${page.number}.${type.extension}"
val filename = DiskUtil.buildValidFilename(
"${manga.title} - ${chapter.name}".take(MAX_FILE_NAME_LENGTH - filenameSuffix.length)
"${manga.title} - ${chapter.name}".takeBytes(MAX_FILE_NAME_BYTES - filenameSuffix.byteSize())
) + filenameSuffix
val destFile = File(directory, filename)
@ -641,7 +643,7 @@ class ReaderPresenter(
}
companion object {
// Safe max filename size is 255 bytes and 1 char = 2 bytes
private const val MAX_FILE_NAME_LENGTH = 127
// Safe theoretical max filename size is 255 bytes and 1 char = 2-4 bytes (UTF-8)
private const val MAX_FILE_NAME_BYTES = 250
}
}

21
app/src/main/java/eu/kanade/tachiyomi/util/lang/StringExtensions.kt
View file

@ -32,3 +32,24 @@ fun String.truncateCenter(count: Int, replacement: String = "..."): String {
fun String.compareToCaseInsensitiveNaturalOrder(other: String): Int {
return String.CASE_INSENSITIVE_ORDER.then(naturalOrder()).compare(this, other)
}
/**
* Returns the size of the string as the number of bytes.
*/
fun String.byteSize(): Int {
return toByteArray(Charsets.UTF_8).size
}
/**
* Returns a string containing the first [n] bytes from this string, or the entire string if this
* string is shorter.
*/
@UseExperimental(ExperimentalStdlibApi::class)
fun String.takeBytes(n: Int): String {
val bytes = toByteArray(Charsets.UTF_8)
return if (bytes.size <= n) {
this
} else {
bytes.decodeToString(endIndex = n).replace("\uFFFD", "")
}
}