public static long copyLarge()

in src/main/java/org/apache/commons/io/IOUtils.java [1664:1688]

• 24 lines of code
• 8 McCabe index (conditional complexity)

    public static long copyLarge(final Reader reader, final Writer writer, final long inputOffset, final long length,
                                 final char[] buffer)
            throws IOException {
        if (inputOffset > 0) {
            skipFully(reader, inputOffset);
        }
        if (length == 0) {
            return 0;
        }
        int bytesToRead = buffer.length;
        if (length > 0 && length < buffer.length) {
            bytesToRead = (int) length;
        }
        int read;
        long totalRead = 0;
        while (bytesToRead > 0 && EOF != (read = reader.read(buffer, 0, bytesToRead))) {
            writer.write(buffer, 0, read);
            totalRead += read;
            if (length > 0) { // only adjust length if not reading to the end
                // Note the cast must work because buffer.length is an integer
                bytesToRead = (int) Math.min(length - totalRead, buffer.length);
            }
        }
        return totalRead;
    }