Java InputStream to Char Array getInputStreamAsCharArray(InputStream stream, int length, String encoding)

Description

get Input Stream As Char Array

License

Open Source License

Declaration

public static char[] getInputStreamAsCharArray(InputStream stream, int length, String encoding)
            throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Main {
    public static char[] getInputStreamAsCharArray(InputStream stream, int length, String encoding)
            throws IOException {
        InputStreamReader reader = null;
        reader = encoding == null ? new InputStreamReader(stream) : new InputStreamReader(stream, encoding);
        char[] contents;
        if (length == -1) {
            contents = new char[0];
            int contentsLength = 0;
            int amountRead = -1;
            do {//from ww  w .  ja  va 2s.  com
                int amountRequested = Math.max(stream.available(), 8192);
                // resize contents if needed
                if (contentsLength + amountRequested > contents.length) {
                    System.arraycopy(contents, 0, contents = new char[contentsLength + amountRequested], 0,
                            contentsLength);
                }

                // read as many chars as possible
                amountRead = reader.read(contents, contentsLength, amountRequested);

                if (amountRead > 0) {
                    // remember length of contents
                    contentsLength += amountRead;
                }
            } while (amountRead != -1);

            // Do not keep first character for UTF-8 BOM encoding
            int start = 0;
            if (contentsLength > 0 && "UTF-8".equals(encoding)) { //$NON-NLS-1$
                if (contents[0] == 0xFEFF) { // if BOM char then skip
                    contentsLength--;
                    start = 1;
                }
            }
            // resize contents if necessary
            if (contentsLength < contents.length) {
                System.arraycopy(contents, start, contents = new char[contentsLength], 0, contentsLength);
            }
        } else {
            contents = new char[length];
            int len = 0;
            int readSize = 0;
            while ((readSize != -1) && (len != length)) {
                // See PR 1FMS89U
                // We record first the read size. In this case len is the actual
                // read size.
                len += readSize;
                readSize = reader.read(contents, len, length - len);
            }
            // Do not keep first character for UTF-8 BOM encoding
            int start = 0;
            if (length > 0 && "UTF-8".equals(encoding)) { //$NON-NLS-1$
                if (contents[0] == 0xFEFF) { // if BOM char then skip
                    len--;
                    start = 1;
                }
            }

            if (len != length)
                System.arraycopy(contents, start, (contents = new char[len]), 0, len);
        }

        reader.close();
        return contents;
    }
}

Related

1. getInputStreamAsCharArray(InputStream stream, int length, String encoding)