WebView Asset PathHandler that returns contents of a zip archive.
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// Licensed under CC-0 terms. https://creativecommons.org/share-your-work/public-domain/cc0/ | |
import java.io.ByteArrayInputStream | |
import java.io.ByteArrayOutputStream | |
import java.nio.ByteBuffer | |
import java.util.zip.ZipInputStream | |
import android.webkit.WebResourceResponse | |
import androidx.webkit.WebViewAssetLoader | |
// WebView Asset PathHandler that returns contents of a zip archive. | |
class ZipArchivePathHandler(private val zipArchiveBytes: ByteArray) : WebViewAssetLoader.PathHandler { | |
override fun handle(path: String): WebResourceResponse? { | |
val bs = ByteArrayInputStream(zipArchiveBytes) | |
val zs = ZipInputStream(bs) | |
while(true) { | |
val entry = zs.nextEntry ?: break | |
if (entry.name == path) { | |
if (entry.size > Int.MAX_VALUE) | |
return WebResourceResponse("text/html", "utf-8", 500, "Internal Error", mapOf(), ByteArrayInputStream("Internal Error: compressed zip entry ${entry.name} has bloated size: ${entry.size}".toByteArray())) | |
// huh, entry.size is not really available?? | |
val os = ByteArrayOutputStream(4096) | |
val bytes = ByteArray(4096) | |
while (true) { | |
val size = zs.read(bytes, 0, bytes.size) | |
if (size < 0) | |
break | |
os.write(bytes, 0, size) | |
} | |
return WebResourceResponse( | |
MimeTypeMap.getSingleton() | |
.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(path)), | |
"utf-8", | |
ByteArrayInputStream(os.toByteArray())) | |
} | |
} | |
return WebResourceResponse("text/html", "utf-8", 404, "Not Found", mapOf(), ByteArrayInputStream("Not found".toByteArray())) | |
} | |
} |
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