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70 lines
1.3 KiB
C++
70 lines
1.3 KiB
C++
#ifndef MANGLE_STREAM_STDIOSERVER_H
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#define MANGLE_STREAM_STDIOSERVER_H
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#include "../stream.hpp"
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#include <iostream>
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#include <stdexcept>
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namespace Mangle {
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namespace Stream {
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/** Simple wrapper for std::istream.
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*/
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class StdStream : public Stream
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{
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std::istream *inf;
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static void fail(const std::string &msg)
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{ throw std::runtime_error("StdStream: " + msg); }
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public:
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StdStream(std::istream *_inf)
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: inf(_inf)
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{
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isSeekable = true;
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hasPosition = true;
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hasSize = true;
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}
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size_t read(void* buf, size_t len)
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{
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inf->read((char*)buf, len);
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if(inf->bad())
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fail("error reading from stream");
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return inf->gcount();
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}
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void seek(size_t pos)
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{
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inf->clear();
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inf->seekg(pos);
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if(inf->fail())
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fail("seek error");
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}
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size_t tell() const
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// Hack around the fact that ifstream->tellg() isn't const
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{ return ((StdStream*)this)->inf->tellg(); }
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size_t size() const
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{
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// Use the standard iostream size hack, terrible as it is.
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std::streampos pos = inf->tellg();
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inf->seekg(0, std::ios::end);
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size_t res = inf->tellg();
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inf->seekg(pos);
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if(inf->fail())
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fail("could not get stream size");
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return res;
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}
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bool eof() const
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{ return inf->eof(); }
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};
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typedef boost::shared_ptr<StdStream> StdStreamPtr;
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}} // namespaces
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#endif
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