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#pragma once
#include <streambuf>
namespace mbgl {
namespace util {
// ref https://artofcode.wordpress.com/2010/12/12/deriving-from-stdstreambuf/
class CharArrayBuffer : public std::streambuf
{
public:
CharArrayBuffer(char const* data, std::size_t size)
: begin_(data), end_(data + size), current_(data) {}
private:
int_type underflow() final {
if (current_ == end_) {
return traits_type::eof();
}
return traits_type::to_int_type(*current_);
}
int_type uflow() final {
if (current_ == end_) {
return traits_type::eof();
}
return traits_type::to_int_type(*current_++);
}
int_type pbackfail(int_type ch) final {
if (current_ == begin_ || (ch != traits_type::eof() && ch != current_[-1])) {
return traits_type::eof();
}
return traits_type::to_int_type(*--current_);
}
std::streamsize showmanyc() final {
return end_ - current_;
}
pos_type seekoff(off_type off, std::ios_base::seekdir dir, std::ios_base::openmode) final {
if (dir == std::ios_base::beg) current_ = std::min(begin_ + off, end_);
else if (dir == std::ios_base::cur) current_ = std::min(current_ + off, end_);
else current_ = std::max(end_ - off, begin_); // dir == std::ios_base::end
return pos_type(off_type(current_ - begin_));
}
char const * const begin_;
char const * const end_;
char const * current_;
};
} // namespace util
} // namespace mbgl
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