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Java port of Oniguruma: http://www.geocities.jp/kosako3/oniguruma that uses byte arrays directly instead of java Strings and chars
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/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package io.airlift.jcodings;

import io.airlift.jcodings.exception.EncodingException;
import io.airlift.jcodings.exception.ErrorMessages;

public abstract class SingleByteEncoding extends AbstractEncoding {

    protected final byte[] LowerCaseTable;
    protected int codeSize = 0xff;

    protected SingleByteEncoding(String name, short[] CTypeTable, byte[] LowerCaseTable) {
        super(name, 1, 1, CTypeTable);
        this.LowerCaseTable = LowerCaseTable;
    }

    protected SingleByteEncoding(String name, short[] CTypeTable, byte[] LowerCaseTable, boolean isDummy) {
        super(name, 1, 1, CTypeTable, isDummy);
        this.LowerCaseTable = LowerCaseTable;
    }
    
    protected SingleByteEncoding(String name, short[] CTypeTable, byte[] LowerCaseTable, boolean isDummy, int codeSize) {
        this(name, CTypeTable, LowerCaseTable, isDummy);
        this.codeSize = codeSize;
    }

    /** onigenc_single_byte_mbc_enc_len
     */
    @Override
    public int length(byte c) {
        return 1;
    }

    @Override
    public int length(byte[] bytes, int p, int end) {
        return 1;
    }

    @Override
    public final int strLength(byte[] bytes, int p, int end) {
        return end - p;
    }

    @Override
    public int strCodeAt(byte[] bytes, int p, int end, int index) {
        return bytes[index] & 0xff;
    }
    // onigenc_is_mbc_newline_0x0a here

    /** onigenc_single_byte_mbc_to_code
     */
    @Override
    public int mbcToCode(byte[] bytes, int p, int end) {
        return bytes[p] & 0xff;
    }

    /** onigenc_single_byte_code_to_mbclen
     */
    @Override
    public int codeToMbcLength(int code) {
        if (Config.VANILLA) {
            if (code <= codeSize) return 1;
            throw new EncodingException(ErrorMessages.ERR_INVALID_CODE_POINT_VALUE);
        } else {
            return 1;
        }
    }

    /** onigenc_single_byte_code_to_mbc
     */
    @Override
    public final int codeToMbc(int code, byte[] bytes, int p) {
        if (code > codeSize) throw new EncodingException("out of range char");
        
        bytes[p] = (byte)(code & 0xff); // c implementation also uses mask here
        return 1;
    }

    /** onigenc_not_support_get_ctype_code_range
     */
    @Override
    public final int[] ctypeCodeRange(int ctype, IntHolder sbOut) {
        return null;
    }

    /** onigenc_single_byte_left_adjust_char_head
     */
    @Override
    public final int leftAdjustCharHead(byte[] bytes, int p, int s, int end) {
        return s;
    }

    /** onigenc_always_true_is_allowed_reverse_match
     */
    @Override
    public final boolean isReverseMatchAllowed(byte[] bytes, int p, int end) {
        return true;
    }
}