CPIO

CPIO (Copy In, Copy Out) is a file archiver utility and its associated file format. It is primarily used on Unix-like operating systems for creating archives of files and directories. The CPIO format supports various sub-formats including the new ASCII format, old ASCII format, and old binary format.

Here is a simple example of how to use Compress4J to create and extract CPIO files:

Example Usage

CPIO Creation

try (CpioArchiveCreator cpioCreator = CpioArchiveCreator.builder(Path.of("example.cpio"))
        .format(CpioFormat.NEW)
        .blockSize(1024)
        .encoding(UTF_8)
        .filter(s -> !s.name().endsWith("temp.txt"))
        .build()) {

    cpioCreator.add(EntrySource.file("document.txt", Path.of("path/to/document.txt")));
    cpioCreator.add(EntrySource.directory("subdir/"));
    cpioCreator.add(EntrySource.file("subdir/nested.txt", Path.of("path/to/nested.txt")));

    cpioCreator.addDirectoryRecursively(Path.of("sourceDir"));
}

CPIO Extraction

try (CpioArchiveExtractor cpioExtractor = CpioArchiveExtractor.builder(Path.of("example.cpio"))
        .blockSize(1024)
        .encoding(UTF_8)
        .filter(entry -> !entry.name().startsWith("temp"))
        .errorHandler((entry, failure) -> entry.name().endsWith(".tmp") ? SKIP : ABORT)
        .escapingSymlinkPolicy(EscapingSymlinkPolicy.DISALLOW)
        .postProcessor((entry, exception) -> {})
        .stripComponents(1)
        .overwrite(true)
        .build()) {
    cpioExtractor.extract(Path.of("outputDir"));
}