@Override
    public int read() throws IOException {
        abortIfNeeded();
        int result;
        // If there are no more available bytes, mark that we are at the end of the stream.
        if (this.virtualAvailable <= 0) {
            result = -1;
        } else {
            // Otherwise, read a byte.
            result = this.decryptedContents.read();
        }

        // If we have not reached the end of the stream, decrement the number of available bytes.
        if (result != -1) {
            this.virtualAvailable--;
        } else {
            // If we are at the end of the stream, close it.
            this.virtualAvailable = 0;
            close();
        }

        return result;
    }
Skip to the start location of the range of bytes desired by the user.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/internal/crypto/AdjustedRangeInputStream.java