mirror of https://github.com/bsnes-emu/bsnes.git
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#ifndef NALL_STREAM_MMAP_HPP
|
|
#define NALL_STREAM_MMAP_HPP
|
|
|
|
#include <nall/filemap.hpp>
|
|
|
|
namespace nall {
|
|
|
|
struct mmapstream : stream {
|
|
using stream::read;
|
|
using stream::write;
|
|
|
|
mmapstream(const string& filename) {
|
|
pmmap.open(filename, filemap::mode::readwrite);
|
|
pwritable = pmmap.open();
|
|
if(!pwritable) pmmap.open(filename, filemap::mode::read);
|
|
pdata = pmmap.data();
|
|
poffset = 0;
|
|
}
|
|
|
|
auto seekable() const -> bool { return true; }
|
|
auto readable() const -> bool { return true; }
|
|
auto writable() const -> bool { return pwritable; }
|
|
auto randomaccess() const -> bool { return true; }
|
|
|
|
auto size() const -> uint { return pmmap.size(); }
|
|
auto offset() const -> uint { return poffset; }
|
|
auto seek(unsigned offset) const -> void { poffset = offset; }
|
|
|
|
auto read() const -> uint8 { return pdata[poffset++]; }
|
|
auto write(uint8 data) const -> void { pdata[poffset++] = data; }
|
|
|
|
auto read(uint offset) const -> uint8 { return pdata[offset]; }
|
|
auto write(uint offset, uint8 data) const -> void { pdata[offset] = data; }
|
|
|
|
private:
|
|
mutable filemap pmmap;
|
|
mutable uint8* pdata = nullptr;
|
|
mutable uint poffset = 0;
|
|
mutable bool pwritable = false;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|