mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-04-04 02:42:37 +02:00
f9adb4d2c6
byuu says: The main thing I worked on today was emulating the MBC7 EEPROM. And... I have many things to say about that, but not here, and not now... The missing EEPROM support is why the accelerometer was broken. Although it's not evidently clear that I'm emulating the actual values incorrectly. I'll think about it and get it fixed, though. bsnes went from ~308fps to ~328fps, and I don't even know why. Probably something somewhere in the 140KB of changes to other things made in this WIP.
336 lines
9.3 KiB
C++
336 lines
9.3 KiB
C++
#pragma once
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#include <nall/platform.hpp>
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#include <nall/inode.hpp>
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#include <nall/stdint.hpp>
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#include <nall/string.hpp>
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#include <nall/utility.hpp>
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#include <nall/varint.hpp>
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#include <nall/hash/sha256.hpp>
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namespace nall {
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struct file : inode, varint {
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enum class mode : uint { read, write, modify, append, readwrite = modify, writeread = append };
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enum class index : uint { absolute, relative };
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static auto copy(const string& sourcename, const string& targetname) -> bool {
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if(sourcename == targetname) return true;
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file rd, wr;
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if(rd.open(sourcename, mode::read) == false) return false;
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if(wr.open(targetname, mode::write) == false) return false;
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for(uint n = 0; n < rd.size(); n++) wr.write(rd.read());
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return true;
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}
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//attempt to rename file first
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//this will fail if paths point to different file systems; fall back to copy+remove in this case
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static auto move(const string& sourcename, const string& targetname) -> bool {
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if(sourcename == targetname) return true;
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if(rename(sourcename, targetname)) return true;
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if(!writable(sourcename)) return false;
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if(copy(sourcename, targetname)) {
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remove(sourcename);
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return true;
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}
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return false;
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}
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static auto truncate(const string& filename, uint size) -> bool {
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#if defined(API_POSIX)
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return truncate(filename, size) == 0;
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#elif defined(API_WINDOWS)
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if(auto fp = _wfopen(utf16_t(filename), L"rb+")) {
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bool result = _chsize(fileno(fp), size) == 0;
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fclose(fp);
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return result;
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}
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return false;
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#endif
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}
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//returns false if specified filename is a directory
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static auto exists(const string& filename) -> bool {
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#if defined(API_POSIX)
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struct stat data;
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if(stat(filename, &data) != 0) return false;
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#elif defined(API_WINDOWS)
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struct __stat64 data;
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if(_wstat64(utf16_t(filename), &data) != 0) return false;
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#endif
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return !(data.st_mode & S_IFDIR);
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}
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static auto size(const string& filename) -> uintmax {
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#if defined(API_POSIX)
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struct stat data;
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stat(filename, &data);
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#elif defined(API_WINDOWS)
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struct __stat64 data;
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_wstat64(utf16_t(filename), &data);
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#endif
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return S_ISREG(data.st_mode) ? data.st_size : 0u;
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}
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static auto read(const string& filename, uint reserve = 0) -> vector<uint8_t> {
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vector<uint8_t> memory;
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file fp;
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if(fp.open(filename, mode::read)) {
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memory.reserve(fp.size() + reserve);
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memory.resize(fp.size());
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fp.read(memory.data(), memory.size());
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}
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return memory;
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}
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static auto read(const string& filename, void* data, uint size) -> bool {
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file fp;
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if(fp.open(filename, mode::read) == false) return false;
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fp.read(data, size);
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fp.close();
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return true;
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}
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static auto write(const string& filename, const string& text) -> bool {
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return write(filename, text.data(), text.size());
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}
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static auto write(const string& filename, const vector<uint8_t>& buffer) -> bool {
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return write(filename, buffer.data(), buffer.size());
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}
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static auto write(const string& filename, const void* data, uint size) -> bool {
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file fp;
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if(fp.open(filename, mode::write) == false) return false;
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fp.write(data, size);
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fp.close();
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return true;
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}
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static auto create(const string& filename) -> bool {
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//create an empty file (will replace existing files)
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file fp;
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if(fp.open(filename, mode::write) == false) return false;
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fp.close();
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return true;
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}
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static auto sha256(const string& filename) -> string {
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auto buffer = read(filename);
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return Hash::SHA256(buffer.data(), buffer.size()).digest();
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}
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auto read() -> uint8_t {
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if(!fp) return 0xff; //file not open
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if(file_mode == mode::write) return 0xff; //reads not permitted
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if(file_offset >= file_size) return 0xff; //cannot read past end of file
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buffer_sync();
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return buffer[(file_offset++) & buffer_mask];
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}
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auto readl(uint length = 1) -> uintmax {
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uintmax data = 0;
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for(int i = 0; i < length; i++) {
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data |= (uintmax)read() << (i << 3);
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}
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return data;
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}
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auto readm(uint length = 1) -> uintmax {
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uintmax data = 0;
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while(length--) {
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data <<= 8;
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data |= read();
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}
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return data;
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}
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auto reads(uint length) -> string {
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string result;
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result.resize(length);
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for(auto& byte : result) byte = read();
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return result;
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}
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auto read(void* data, uint size) -> void {
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auto output = (uint8_t*)data;
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while(size--) *output++ = read();
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}
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auto write(uint8_t data) -> void {
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if(!fp) return; //file not open
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if(file_mode == mode::read) return; //writes not permitted
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buffer_sync();
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buffer[(file_offset++) & buffer_mask] = data;
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buffer_dirty = true;
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if(file_offset > file_size) file_size = file_offset;
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}
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auto writel(uintmax data, uint length = 1) -> void {
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while(length--) {
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write(data);
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data >>= 8;
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}
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}
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auto writem(uintmax data, uint length = 1) -> void {
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for(int i = length - 1; i >= 0; i--) {
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write(data >> (i << 3));
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}
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}
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auto writes(const string& s) -> void {
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for(auto byte : s) write(byte);
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}
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auto write(const void* data, uint size) -> void {
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auto input = (const uint8_t*)data;
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while(size--) write(*input++);
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}
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template<typename... Args> auto print(Args... args) -> void {
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string data(args...);
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const char* p = data;
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while(*p) write(*p++);
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}
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auto flush() -> void {
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buffer_flush();
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fflush(fp);
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}
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auto seek(int offset, index index_ = index::absolute) -> void {
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if(!fp) return; //file not open
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buffer_flush();
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intmax req_offset = file_offset;
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switch(index_) {
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case index::absolute: req_offset = offset; break;
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case index::relative: req_offset += offset; break;
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}
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if(req_offset < 0) req_offset = 0; //cannot seek before start of file
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if(req_offset > file_size) {
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if(file_mode == mode::read) { //cannot seek past end of file
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req_offset = file_size;
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} else { //pad file to requested location
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file_offset = file_size;
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while(file_size < req_offset) write(0x00);
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}
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}
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file_offset = req_offset;
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}
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auto offset() const -> uint {
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if(!fp) return 0; //file not open
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return file_offset;
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}
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auto size() const -> uint {
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if(!fp) return 0; //file not open
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return file_size;
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}
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auto truncate(uint size) -> bool {
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if(!fp) return false; //file not open
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#if defined(API_POSIX)
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return ftruncate(fileno(fp), size) == 0;
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#elif defined(API_WINDOWS)
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return _chsize(fileno(fp), size) == 0;
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#endif
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}
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auto end() const -> bool {
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if(!fp) return true; //file not open
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return file_offset >= file_size;
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}
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auto open() const -> bool {
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return fp;
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}
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explicit operator bool() const {
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return open();
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}
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auto open(const string& filename, mode mode_) -> bool {
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if(fp) return false;
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switch(file_mode = mode_) {
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#if defined(API_POSIX)
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case mode::read: fp = fopen(filename, "rb" ); break;
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case mode::write: fp = fopen(filename, "wb+"); break; //need read permission for buffering
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case mode::readwrite: fp = fopen(filename, "rb+"); break;
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case mode::writeread: fp = fopen(filename, "wb+"); break;
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#elif defined(API_WINDOWS)
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case mode::read: fp = _wfopen(utf16_t(filename), L"rb" ); break;
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case mode::write: fp = _wfopen(utf16_t(filename), L"wb+"); break;
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case mode::readwrite: fp = _wfopen(utf16_t(filename), L"rb+"); break;
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case mode::writeread: fp = _wfopen(utf16_t(filename), L"wb+"); break;
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#endif
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}
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if(!fp) return false;
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buffer_offset = -1; //invalidate buffer
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file_offset = 0;
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fseek(fp, 0, SEEK_END);
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file_size = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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return true;
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}
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auto close() -> void {
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if(!fp) return;
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buffer_flush();
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fclose(fp);
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fp = nullptr;
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}
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auto operator=(const file&) -> file& = delete;
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file(const file&) = delete;
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file() = default;
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file(const string& filename, mode mode_) {
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open(filename, mode_);
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}
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~file() {
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close();
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}
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private:
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enum { buffer_size = 1 << 12, buffer_mask = buffer_size - 1 };
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char buffer[buffer_size] = {0};
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int buffer_offset = -1; //invalidate buffer
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bool buffer_dirty = false;
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FILE* fp = nullptr;
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uint file_offset = 0;
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uint file_size = 0;
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mode file_mode = mode::read;
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auto buffer_sync() -> void {
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if(!fp) return; //file not open
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if(buffer_offset != (file_offset & ~buffer_mask)) {
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buffer_flush();
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buffer_offset = file_offset & ~buffer_mask;
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fseek(fp, buffer_offset, SEEK_SET);
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uint length = (buffer_offset + buffer_size) <= file_size ? buffer_size : (file_size & buffer_mask);
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if(length) auto unused = fread(buffer, 1, length, fp);
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}
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}
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auto buffer_flush() -> void {
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if(!fp) return; //file not open
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if(file_mode == mode::read) return; //buffer cannot be written to
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if(buffer_offset < 0) return; //buffer unused
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if(buffer_dirty == false) return; //buffer unmodified since read
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fseek(fp, buffer_offset, SEEK_SET);
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uint length = (buffer_offset + buffer_size) <= file_size ? buffer_size : (file_size & buffer_mask);
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if(length) auto unused = fwrite(buffer, 1, length, fp);
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buffer_offset = -1; //invalidate buffer
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buffer_dirty = false;
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}
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};
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}
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