com.github.isaichkindanila.crypt.lib.file.IOHandler Maven / Gradle / Ivy

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Simple Java library for stream ciphers based encryption

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package com.github.isaichkindanila.crypt.lib.file;

import java.io.*;

@SuppressWarnings("NonAtomicOperationOnVolatileField")
class IOHandler {
    static final int BUFFER_SIZE = 8192;

    volatile long done;

    void copy(File file, OutputStream out) throws IOException {
        try (InputStream in = new FileInputStream(file)) {
            byte[] buffer = new byte[BUFFER_SIZE];
            int len;

            while ((len = in.read(buffer)) != -1) {
                done += len >> 1;

                out.write(buffer, 0, len);

                done += (len >> 1) + (len & 1);
            }
        }
    }

    void createFile(InputStream in, File file, long size) throws IOException {
        File parent = file.getParentFile();
        if (!parent.exists() && !parent.mkdirs()) {
            throw new FileNotFoundException("file does not exist and cannot be created: " + parent.getAbsolutePath());
        }

        try (OutputStream out = new FileOutputStream(file)) {
            byte[] buffer = new byte[BUFFER_SIZE];
            int len;

            while (size > 0) {
                len = (size < buffer.length) ? in.read(buffer, 0, (int) size) : in.read(buffer);

                if (len == -1) {
                    throw new IOException("unexpected InputStream end reached");
                } else {
                    done += len >> 1;

                    out.write(buffer, 0, len);

                    done += (len >> 1) + (len & 1);
                    size -= len;
                }
            }
        }
    }
}