Find table-line-number from an array of bytes.

byteArrayToLineNumber.java

private static int byteArrayToLineNumber(byte[] bytesSeek, CtMethod ctMethod, int byteArraySize)
            throws BadBytecode, RuntimeException {

    // Using bytesSeek iterate through the ctMethod's bytecode looking for a matching byte array sized to byteArraySize
    int bytecodeIndex = -1;
    CodeIterator codeIterator = ctMethod.getMethodInfo().getCodeAttribute().iterator();
    codeIterator.begin();
    long find = byteArrayToLong(bytesSeek);
    while (codeIterator.hasNext() && codeIterator.lookAhead() + byteArraySize < codeIterator.getCodeLength()) {
        int index = codeIterator.next();
        byte[] bytesFound = new byte[byteArraySize];
        for(int i=0;i<byteArraySize;i++){
            bytesFound[i] = (byte)codeIterator.byteAt(index + i);
        }
        long found = byteArrayToLong(bytesFound);
        if (found == find) {
            bytecodeIndex = index;
        }
    }
    if (bytecodeIndex == -1)
        throw new RuntimeException("no bytecode match found.");
    // Get the line number table entry for the bytecodeIndex.
    LineNumberAttribute lineNumberAttribute = (LineNumberAttribute) ctMethod.getMethodInfo().getCodeAttribute()
            .getAttribute(LineNumberAttribute.tag);
    int lineNumber = lineNumberAttribute.toLineNumber(bytecodeIndex);
    int lineNumberTableOrdinal =  IntStream.range(0, lineNumberAttribute.tableLength())
            .filter(value -> Objects.equals(lineNumberAttribute.lineNumber(value), lineNumber))
            .findFirst()
            .orElseThrow(RuntimeException::new);
    return lineNumberAttribute.lineNumber(lineNumberTableOrdinal);
}

private static long byteArrayToLong(byte[] bytesOriginal) {
    if (bytesOriginal.length < 8) {
        byte[] bytesLongPadded = new byte[8];
        System.arraycopy(bytesOriginal, 0, bytesLongPadded, 8 - bytesOriginal.length,
                bytesOriginal.length);
        return ByteBuffer.wrap(bytesLongPadded).getLong();
    }
    else
        return ByteBuffer.wrap(bytesOriginal).getLong();
}