mirror of
https://github.com/libSDL2pp/libSDL2pp.git
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101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
/*
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libSDL2pp - C++11 bindings/wrapper for SDL2
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Copyright (C) 2014 Dmitry Marakasov <amdmi3@amdmi3.ru>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef SDL2PP_STREAMRWOPS_HH
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#define SDL2PP_STREAMRWOPS_HH
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#include <SDL2pp/RWops.hh>
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#include <stdexcept>
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#include <iostream>
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namespace SDL2pp {
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template<typename S>
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class StreamRWops : public CustomRWops {
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protected:
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S& stream_;
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public:
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StreamRWops(const S& stream) : stream_(stream) {
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}
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StreamRWops(const StreamRWops<S>&) = default;
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StreamRWops& operator=(const StreamRWops<S>&) = delete;
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StreamRWops(StreamRWops<S>&&) noexcept = default;
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StreamRWops& operator=(StreamRWops<S>&&) = delete;
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virtual Sint64 Seek(Sint64 offset, int whence) override {
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switch (whence) {
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case RW_SEEK_SET:
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stream_.seekg(offset, std::ios_base::beg);
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break;
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case RW_SEEK_CUR:
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stream_.seekg(offset, std::ios_base::cur);
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break;
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case RW_SEEK_END:
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stream_.seekg(offset, std::ios_base::end);
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break;
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default:
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throw Exception("Unexpected whence value for StreamRWops::Seek");
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}
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return stream_.tellg();
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}
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virtual size_t Read(void* ptr, size_t size, size_t maxnum) override {
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stream_.read(ptr, size * maxnum);
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size_t nread = stream_.gcount();
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if (nread != size * maxnum) {
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// short read
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unsigned char* pos = static_cast<unsigned char*>(ptr);
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pos += nread + 1;
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int count = nread % size;
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// put partially read object back into the stream
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while (--count >= 0)
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stream_.putback(*--pos);
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stream_.seekg(-count, std::ios_base::cur);
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}
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return nread / size;
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}
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virtual size_t Write(const void* ptr, size_t size, size_t maxnum) override {
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stream_.write(ptr, size * maxnum);
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// XXX: there seem to be no reliable way to tell how much
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// was actually written
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if (stream_.restate() & std::ios_base::badbit)
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return 0;
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return maxnum;
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}
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virtual int Close() override {
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stream_.flush();
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return stream_.restate() & std::ios_base::badbit;
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}
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};
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}
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#endif
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