ByteRange.h

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// Copyright © 2008-2023 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _BYTERANGE_H
#define _BYTERANGE_H
 
#include <algorithm>
#include <cassert>
#include <cctype>
#include <cstring>
 
struct ByteRange {
    ByteRange() :
        begin(0),
        end(0) {}
    ByteRange(const char *begin_, const char *end_) :
        begin(begin_),
        end(end_)
    {
        assert(begin_ && end_);
        assert((end_ - begin_) >= 0);
    }
    ByteRange(const char *begin_, size_t size) :
        begin(begin_),
        end(begin_ + size)
    {
        assert(begin_);
    }
 
    const char *begin;
    const char *end;
 
    bool Empty() const { return (begin == end); }
    size_t Size() const { return (end - begin); }
 
    const char &operator[](size_t idx) const { return begin[idx]; }
    const char &operator*() const { return *begin; }
 
    size_t read(char *to, size_t sz, size_t count);
};
 
inline size_t ByteRange::read(char *to, size_t sz, size_t count)
{
    size_t avail = Size() / sz;
    count = std::min(count, avail);
    size_t fullsize = sz * count;
    assert(fullsize <= Size());
    memcpy(to, begin, fullsize);
    begin += fullsize;
    return count;
}
 
#endif