How can I download a single file from a large remote zip file in Java?

I'm trying to download a small file (0.3 KB) from a given zip file that's around 3-5 GB in size.

I have currently been using the native library libfragmentzip using JNA, which is very fast, but has issues of its own that come with using native libraries (like not being cross-platform).

I have tried this solution, but it is much slower and ends up taking minutes compared to using libfragmentzip, which only seems to take seconds.

This is a URL to a test zip file (the extension is .ipsw but it is really a zip). The file I am trying to download is BuildManifest.plist, in the root of the zip.

Is there a fast way to download a single file from a remote zip file without using a native library?

You can insert BuildManifest.plist at the end of the URL.

For example:

http://updates-http.cdn-apple.com/2021SpringFCS/fullrestores/071-34317/E63B034D-2116-42D0-9FBD-97A3D9060F68/BuildManifest.plist

Using Apache Commons Compress and a custom ByteChannel implementation backed by HTTP:

var url = new URL(...);
var fileName = "file.txt";
var dest = Path.of(fileName);

try (var zip = new ZipFile(new HttpChannel(url), "zip", "UTF8", true, true);
    var stream = zip.getInputStream(zip.getEntry(fileName))) {
    Files.copy(stream, dest, StandardCopyOption.REPLACE_EXISTING);
}

HttpChannel (modified from JCodec):

public class HttpChannel implements SeekableByteChannel {
private final URL url;
private ReadableByteChannel ch;
private long pos;
private long length;
public HttpChannel(URL url) {
this.url = url;
}
@Override
public long position() {
return pos;
}
@Override
public SeekableByteChannel position(long newPosition) throws IOException {
if (newPosition == pos) {
return this;
} else if (ch != null) {
ch.close();
ch = null;
}
pos = newPosition;
return this;
}
@Override
public long size() throws IOException {
ensureOpen();
return length;
}
@Override
public SeekableByteChannel truncate(long size) {
throw new UnsupportedOperationException("Truncate on HTTP is not supported.");
}
@Override
public int read(ByteBuffer buffer) throws IOException {
ensureOpen();
int read = ch.read(buffer);
if (read != -1)
pos += read;
return read;
}
@Override
public int write(ByteBuffer buffer) {
throw new UnsupportedOperationException("Write to HTTP is not supported.");
}
@Override
public boolean isOpen() {
return ch != null && ch.isOpen();
}
@Override
public void close() throws IOException {
ch.close();
}
private void ensureOpen() throws IOException {
if (ch == null) {
URLConnection connection = url.openConnection();
if (pos > 0)
connection.addRequestProperty("Range", "bytes=" + pos + "-");
ch = Channels.newChannel(connection.getInputStream());
String resp = connection.getHeaderField("Content-Range");
if (resp != null) {
length = Long.parseLong(resp.split("/")[1]);
} else {
resp = connection.getHeaderField("Content-Length");
length = Long.parseLong(resp);
}
}
}
}