mirror of https://github.com/bsnes-emu/bsnes.git
43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
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#ifndef NALL_STREAM_MMAP_HPP
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#define NALL_STREAM_MMAP_HPP
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#include <nall/filemap.hpp>
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namespace nall {
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struct mmapstream : stream {
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using stream::read;
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using stream::write;
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bool seekable() const { return true; }
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bool readable() const { return true; }
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bool writable() const { return pwritable; }
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bool randomaccess() const { return true; }
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unsigned size() const { return pmmap.size(); }
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unsigned offset() const { return poffset; }
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void seek(unsigned offset) const { poffset = offset; }
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uint8_t read() const { return pdata[poffset++]; }
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void write(uint8_t data) const { pdata[poffset++] = data; }
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uint8_t read(unsigned offset) const { return pdata[offset]; }
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void write(unsigned offset, uint8_t data) const { pdata[offset] = data; }
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mmapstream(const string &filename) {
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pmmap.open(filename, filemap::mode::readwrite);
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pwritable = pmmap.open();
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if(!pwritable) pmmap.open(filename, filemap::mode::read);
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pdata = pmmap.data(), poffset = 0;
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}
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private:
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mutable filemap pmmap;
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mutable uint8_t *pdata;
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mutable unsigned pwritable, poffset;
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};
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}
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#endif
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