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30 lines
734 B
C++
30 lines
734 B
C++
#include <scwx/util/rangebuf.hpp>
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namespace scwx
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{
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namespace util
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{
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rangebuf::rangebuf(std::streambuf* sbuf, size_t size) :
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size_(size), sbuf_(sbuf), data_()
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{
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size_t bufferSize = std::max<size_t>(size, 4096u);
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data_.reserve(bufferSize);
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}
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int rangebuf::underflow()
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{
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char* buf = data_.data();
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ptrdiff_t bufSize = data_.capacity();
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// Read from underlying stream buffer into own buffer until needed characters
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// have been consumed
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size_t r(sbuf_->sgetn(buf, std::min<size_t>(bufSize, size_)));
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size_ -= r;
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setg(buf, buf, buf + r);
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return gptr() == egptr() ? traits_type::eof() :
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traits_type::to_int_type(*gptr());
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}
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} // namespace util
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} // namespace scwx
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