mirror of https://github.com/bsnes-emu/bsnes.git
56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
#ifdef NALL_MOSAIC_INTERNAL_HPP
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namespace nall {
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namespace mosaic {
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struct bitstream {
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filemap fp;
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uint8_t* data = nullptr;
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unsigned size = 0;
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bool readonly = false;
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bool endian = 1;
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bool read(uint64_t addr) const {
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if(data == nullptr || (addr >> 3) >= size) return 0;
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unsigned mask = endian == 0 ? (0x01 << (addr & 7)) : (0x80 >> (addr & 7));
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return data[addr >> 3] & mask;
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}
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void write(uint64_t addr, bool value) {
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if(data == nullptr || readonly == true || (addr >> 3) >= size) return;
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unsigned mask = endian == 0 ? (0x01 << (addr & 7)) : (0x80 >> (addr & 7));
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if(value == 0) data[addr >> 3] &= ~mask;
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if(value == 1) data[addr >> 3] |= mask;
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}
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bool open(const string& filename) {
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readonly = false;
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if(fp.open(filename, filemap::mode::readwrite) == false) {
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readonly = true;
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if(fp.open(filename, filemap::mode::read) == false) {
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return false;
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}
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}
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data = fp.data();
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size = fp.size();
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return true;
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}
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void close() {
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fp.close();
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data = nullptr;
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}
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bitstream() {
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}
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~bitstream() {
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close();
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}
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};
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}
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}
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#endif
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