public void unpack()

in src/main/java/org/apache/commons/compress/harmony/unpack200/Archive.java [137:232]
92 lines of code
22 McCabe index (conditional complexity)

    public void unpack() throws Pack200Exception, IOException {
        outputStream.setComment("PACK200");
        try {
            if (!inputStream.markSupported()) {
                inputStream = new BufferedInputStream(inputStream);
                if (!inputStream.markSupported()) {
                    throw new IllegalStateException();
                }
            }
            inputStream.mark(2);
            if (((inputStream.read() & 0xFF) | (inputStream.read() & 0xFF) << 8) == GZIPInputStream.GZIP_MAGIC) {
                inputStream.reset();
                inputStream = new BufferedInputStream(new GZIPInputStream(inputStream));
            } else {
                inputStream.reset();
            }
            inputStream.mark(4);
            final int[] magic = {0xCA, 0xFE, 0xD0, 0x0D}; // Magic word for
            // pack200
            final int[] word = new int[4];
            for (int i = 0; i < word.length; i++) {
                word[i] = inputStream.read();
            }
            boolean compressedWithE0 = false;
            for (int m = 0; m < magic.length; m++) {
                if (word[m] != magic[m]) {
                    compressedWithE0 = true;
                }
            }
            inputStream.reset();
            if (compressedWithE0) { // The original Jar was not packed, so just
                // copy it across
                final JarInputStream jarInputStream = new JarInputStream(inputStream);
                JarEntry jarEntry;
                while ((jarEntry = jarInputStream.getNextJarEntry()) != null) {
                    outputStream.putNextEntry(jarEntry);
                    final byte[] bytes = new byte[16384];
                    int bytesRead = jarInputStream.read(bytes);
                    while (bytesRead != -1) {
                        outputStream.write(bytes, 0, bytesRead);
                        bytesRead = jarInputStream.read(bytes);
                    }
                    outputStream.closeEntry();
                }
            } else {
                int i = 0;
                while (available(inputStream)) {
                    i++;
                    final Segment segment = new Segment();
                    segment.setLogLevel(logLevel);
                    segment.setLogStream(logFile != null ? (OutputStream) logFile : (OutputStream) System.out);
                    segment.setPreRead(false);

                    if (i == 1) {
                        segment.log(Segment.LOG_LEVEL_VERBOSE,
                            "Unpacking from " + inputFileName + " to " + outputFileName);
                    }
                    segment.log(Segment.LOG_LEVEL_VERBOSE, "Reading segment " + i);
                    if (overrideDeflateHint) {
                        segment.overrideDeflateHint(deflateHint);
                    }
                    segment.unpack(inputStream, outputStream);
                    outputStream.flush();

                    if (inputStream instanceof FileInputStream) {
                        inputFileName = ((FileInputStream) inputStream).getFD().toString();
                    }
                }
            }
        } finally {
            try {
                inputStream.close();
            } catch (final Exception e) {
            }
            try {
                outputStream.close();
            } catch (final Exception e) {
            }
            if (logFile != null) {
                try {
                    logFile.close();
                } catch (final Exception e) {
                }
            }
        }
        if (removePackFile) {
            boolean deleted = false;
            if (inputFileName != null) {
                final File file = new File(inputFileName);
                deleted = file.delete();
            }
            if (!deleted) {
                throw new Pack200Exception("Failed to delete the input file.");
            }
        }
    }