////  ByteRange.h//  libraries/networking/src////  Created by Stephen Birarda on 4/17/17.//  Copyright 2017 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #ifndef hifi_ByteRange_h#define hifi_ByteRange_h struct ByteRange {    int64_t fromInclusive { 0 };    int64_t toExclusive { 0 };     bool isSet() const { return fromInclusive < 0 || fromInclusive < toExclusive; }    int64_t size() const { return toExclusive - fromInclusive; }     // byte ranges are invalid if:    // (1) the toExclusive of the range is negative    // (2) the toExclusive of the range is less than the fromInclusive, and isn't zero    // (3) the fromExclusive of the range is negative, and the toExclusive isn't zero    bool isValid() {        return toExclusive >= 0                && (toExclusive >= fromInclusive || toExclusive == 0)                && (fromInclusive >= 0 || toExclusive == 0);    }     void fixupRange(int64_t fileSize) {        if (!isSet()) {            // if the byte range is not set, force it to be from 0 to the end of the file            fromInclusive = 0;            toExclusive = fileSize;        }         if (fromInclusive > 0 && toExclusive == 0) {            // we have a left side of the range that is non-zero            // if the RHS of the range is zero, set it to the end of the file now            toExclusive = fileSize;        } else if (-fromInclusive >= fileSize) {            // we have a negative range that is equal or greater than the full size of the file            // so we just set this to be a range across the entire file, from 0            fromInclusive = 0;            toExclusive = fileSize;        }    }};  #endif // hifi_ByteRange_h