Blog bookmarks 09/26/2012

  • “public class UnicodeReader extends Reader {
        private static final int BOM_SIZE = 4;
        private final InputStreamReader reader;

        /**
         * Construct UnicodeReader
         * @param in Input stream.
         * @param defaultEncoding Default encoding to be used if BOM is not found,
         * or null to use system default encoding.
         * @throws IOException If an I/O error occurs.
         */
        public UnicodeReader(InputStream in, String defaultEncoding) throws IOException {
            byte bom[] = new byte[BOM_SIZE];
            String encoding;
            int unread;
            PushbackInputStream pushbackStream = new PushbackInputStream(in, BOM_SIZE);
            int n = pushbackStream.read(bom, 0, bom.length);

            // Read ahead four bytes and check for BOM marks.
            if ((bom[0] == (byte) 0xEF) && (bom[1] == (byte) 0xBB) && (bom[2] == (byte) 0xBF)) {
                encoding = “UTF-8”;
                unread = n – 3;
            } else if ((bom[0] == (byte) 0xFE) && (bom[1] == (byte) 0xFF)) {
                encoding = “UTF-16BE”;
                unread = n – 2;
            } else if ((bom[0] == (byte) 0xFF) && (bom[1] == (byte) 0xFE)) {
                encoding = “UTF-16LE”;
                unread = n – 2;
            } else if ((bom[0] == (byte) 0x00) && (bom[1] == (byte) 0x00) && (bom[2] == (byte) 0xFE) && (bom[3] == (byte) 0xFF)) {
                encoding = “UTF-32BE”;
                unread = n – 4;
            } else if ((bom[0] == (byte) 0xFF) && (bom[1] == (byte) 0xFE) && (bom[2] == (byte) 0x00) && (bom[3] == (byte) 0x00)) {
                encoding = “UTF-32LE”;
                unread = n – 4;
            } else {
                encoding = defaultEncoding;
                unread = n;
            }

            // Unread bytes if necessary and skip BOM marks.
            if (unread > 0) {
                pushbackStream.unread(bom, (n – unread), unread);
            } else if (unread < -1) {
                pushbackStream.unread(bom, 0, 0);
            }

            // Use given encoding.
            if (encoding == null) {
                reader = new InputStreamReader(pushbackStream);
            } else {
                reader = new InputStreamReader(pushbackStream, encoding);
            }
        }

        public String getEncoding() {
            return reader.getEncoding();
        }

        public int read(char[] cbuf, int off, int len) throws IOException {
            return reader.read(cbuf, off, len);
        }

        public void close() throws IOException {
            reader.close();
        }
    }"

    tags: java mark bom

  • tags: time java date

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