style(backup): refactor code
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08d27520e0
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bd54700103
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@ -189,7 +189,7 @@ pub fn init(allocator: Allocator, cpu: *Arm7tdmi, rom_path: []const u8, save_pat
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const file_buf = try file.readToEndAlloc(allocator, try file.getEndPos());
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const title = file_buf[0xA0..0xAC].*;
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const kind = Backup.guessKind(file_buf);
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const kind = Backup.guess(file_buf);
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const device = if (force_rtc) .Rtc else guessDevice(file_buf);
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logHeader(file_buf, &title);
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@ -8,6 +8,7 @@ const Flash = @import("backup/Flash.zig");
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const escape = @import("../../util.zig").escape;
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const span = @import("../../util.zig").span;
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const Needle = struct { str: []const u8, kind: Backup.Kind };
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const backup_kinds = [6]Needle{
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.{ .str = "EEPROM_V", .kind = .Eeprom },
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.{ .str = "SRAM_V", .kind = .Sram },
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@ -17,6 +18,8 @@ const backup_kinds = [6]Needle{
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.{ .str = "FLASH1M_V", .kind = .Flash1M },
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};
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const SaveError = error{Unsupported};
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pub const Backup = struct {
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const Self = @This();
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@ -38,122 +41,6 @@ pub const Backup = struct {
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None,
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};
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pub fn init(allocator: Allocator, kind: Kind, title: [12]u8, path: ?[]const u8) !Self {
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log.info("Kind: {}", .{kind});
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const buf_size: usize = switch (kind) {
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.Sram => 0x8000, // 32K
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.Flash => 0x10000, // 64K
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.Flash1M => 0x20000, // 128K
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.None, .Eeprom => 0, // EEPROM is handled upon first Read Request to it
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};
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const buf = try allocator.alloc(u8, buf_size);
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std.mem.set(u8, buf, 0xFF);
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var backup = Self{
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.buf = buf,
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.allocator = allocator,
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.kind = kind,
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.title = title,
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.save_path = path,
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.flash = Flash.create(),
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.eeprom = Eeprom.create(allocator),
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};
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if (backup.save_path) |p| backup.loadSaveFromDisk(allocator, p) catch |e| log.err("Failed to load save: {}", .{e});
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return backup;
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}
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pub fn guessKind(rom: []const u8) Kind {
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for (backup_kinds) |needle| {
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const needle_len = needle.str.len;
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var i: usize = 0;
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while ((i + needle_len) < rom.len) : (i += 1) {
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if (std.mem.eql(u8, needle.str, rom[i..][0..needle_len])) return needle.kind;
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}
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}
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return .None;
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}
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pub fn deinit(self: *Self) void {
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if (self.save_path) |path| self.writeSaveToDisk(self.allocator, path) catch |e| log.err("Failed to write save: {}", .{e});
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self.allocator.free(self.buf);
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self.* = undefined;
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}
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fn loadSaveFromDisk(self: *Self, allocator: Allocator, path: []const u8) !void {
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const file_path = try self.getSaveFilePath(allocator, path);
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defer allocator.free(file_path);
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// FIXME: Don't rely on this lol
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if (std.mem.eql(u8, file_path[file_path.len - 12 .. file_path.len], "untitled.sav")) {
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return log.err("ROM header lacks title, no save loaded", .{});
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}
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const file: std.fs.File = try std.fs.openFileAbsolute(file_path, .{});
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const file_buf = try file.readToEndAlloc(allocator, try file.getEndPos());
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defer allocator.free(file_buf);
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switch (self.kind) {
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.Sram, .Flash, .Flash1M => {
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if (self.buf.len == file_buf.len) {
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std.mem.copy(u8, self.buf, file_buf);
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return log.info("Loaded Save from {s}", .{file_path});
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}
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log.err("{s} is {} bytes, but we expected {} bytes", .{ file_path, file_buf.len, self.buf.len });
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},
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.Eeprom => {
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if (file_buf.len == 0x200 or file_buf.len == 0x2000) {
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self.eeprom.kind = if (file_buf.len == 0x200) .Small else .Large;
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self.buf = try allocator.alloc(u8, file_buf.len);
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std.mem.copy(u8, self.buf, file_buf);
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return log.info("Loaded Save from {s}", .{file_path});
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}
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log.err("EEPROM can either be 0x200 bytes or 0x2000 byes, but {s} was {X:} bytes", .{
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file_path,
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file_buf.len,
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});
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},
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.None => return SaveError.UnsupportedBackupKind,
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}
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}
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fn getSaveFilePath(self: *const Self, allocator: Allocator, path: []const u8) ![]const u8 {
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const filename = try self.getSaveFilename(allocator);
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defer allocator.free(filename);
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return try std.fs.path.join(allocator, &[_][]const u8{ path, filename });
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}
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fn getSaveFilename(self: *const Self, allocator: Allocator) ![]const u8 {
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const title_str = span(&escape(self.title));
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const name = if (title_str.len != 0) title_str else "untitled";
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return try std.mem.concat(allocator, u8, &[_][]const u8{ name, ".sav" });
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}
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fn writeSaveToDisk(self: Self, allocator: Allocator, path: []const u8) !void {
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const file_path = try self.getSaveFilePath(allocator, path);
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defer allocator.free(file_path);
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switch (self.kind) {
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.Sram, .Flash, .Flash1M, .Eeprom => {
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const file = try std.fs.createFileAbsolute(file_path, .{});
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defer file.close();
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try file.writeAll(self.buf);
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log.info("Wrote Save to {s}", .{file_path});
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},
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else => return SaveError.UnsupportedBackupKind,
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}
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}
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pub fn read(self: *const Self, address: usize) u8 {
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const addr = address & 0xFFFF;
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@ -212,22 +99,121 @@ pub const Backup = struct {
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.None, .Eeprom => {},
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}
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}
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pub fn init(allocator: Allocator, kind: Kind, title: [12]u8, path: ?[]const u8) !Self {
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log.info("Kind: {}", .{kind});
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const buf_size: usize = switch (kind) {
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.Sram => 0x8000, // 32K
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.Flash => 0x10000, // 64K
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.Flash1M => 0x20000, // 128K
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.None, .Eeprom => 0, // EEPROM is handled upon first Read Request to it
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};
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const Needle = struct {
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const Self = @This();
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const buf = try allocator.alloc(u8, buf_size);
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std.mem.set(u8, buf, 0xFF);
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str: []const u8,
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kind: Backup.Kind,
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fn init(str: []const u8, kind: Backup.Kind) Self {
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return .{
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.str = str,
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var backup = Self{
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.buf = buf,
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.allocator = allocator,
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.kind = kind,
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.title = title,
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.save_path = path,
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.flash = Flash.create(),
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.eeprom = Eeprom.create(allocator),
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};
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if (backup.save_path) |p| backup.readSave(allocator, p) catch |e| log.err("Failed to load save: {}", .{e});
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return backup;
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}
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pub fn deinit(self: *Self) void {
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if (self.save_path) |path| self.writeSave(self.allocator, path) catch |e| log.err("Failed to write save: {}", .{e});
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self.allocator.free(self.buf);
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self.* = undefined;
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}
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/// Guesses the Backup Kind of a GBA ROM
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pub fn guess(rom: []const u8) Kind {
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for (backup_kinds) |needle| {
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const needle_len = needle.str.len;
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var i: usize = 0;
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while ((i + needle_len) < rom.len) : (i += 1) {
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if (std.mem.eql(u8, needle.str, rom[i..][0..needle_len])) return needle.kind;
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}
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}
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return .None;
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}
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fn readSave(self: *Self, allocator: Allocator, path: []const u8) !void {
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const file_path = try self.savePath(allocator, path);
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defer allocator.free(file_path);
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// FIXME: Don't rely on this lol
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if (std.mem.eql(u8, file_path[file_path.len - 12 .. file_path.len], "untitled.sav")) {
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return log.err("ROM header lacks title, no save loaded", .{});
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}
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const file: std.fs.File = try std.fs.openFileAbsolute(file_path, .{});
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const file_buf = try file.readToEndAlloc(allocator, try file.getEndPos());
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defer allocator.free(file_buf);
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switch (self.kind) {
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.Sram, .Flash, .Flash1M => {
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if (self.buf.len == file_buf.len) {
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std.mem.copy(u8, self.buf, file_buf);
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return log.info("Loaded Save from {s}", .{file_path});
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}
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log.err("{s} is {} bytes, but we expected {} bytes", .{ file_path, file_buf.len, self.buf.len });
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},
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.Eeprom => {
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if (file_buf.len == 0x200 or file_buf.len == 0x2000) {
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self.eeprom.kind = if (file_buf.len == 0x200) .Small else .Large;
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self.buf = try allocator.alloc(u8, file_buf.len);
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std.mem.copy(u8, self.buf, file_buf);
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return log.info("Loaded Save from {s}", .{file_path});
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}
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log.err("EEPROM can either be 0x200 bytes or 0x2000 byes, but {s} was {X:} bytes", .{
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file_path,
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file_buf.len,
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});
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},
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.None => return SaveError.Unsupported,
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}
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}
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fn savePath(self: *const Self, allocator: Allocator, path: []const u8) ![]const u8 {
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const filename = try self.saveName(allocator);
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defer allocator.free(filename);
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return try std.fs.path.join(allocator, &[_][]const u8{ path, filename });
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}
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fn saveName(self: *const Self, allocator: Allocator) ![]const u8 {
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const title_str = span(&escape(self.title));
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const name = if (title_str.len != 0) title_str else "untitled";
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return try std.mem.concat(allocator, u8, &[_][]const u8{ name, ".sav" });
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}
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fn writeSave(self: Self, allocator: Allocator, path: []const u8) !void {
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const file_path = try self.savePath(allocator, path);
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defer allocator.free(file_path);
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switch (self.kind) {
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.Sram, .Flash, .Flash1M, .Eeprom => {
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const file = try std.fs.createFileAbsolute(file_path, .{});
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defer file.close();
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try file.writeAll(self.buf);
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log.info("Wrote Save to {s}", .{file_path});
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},
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else => return SaveError.Unsupported,
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}
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}
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};
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const SaveError = error{
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UnsupportedBackupKind,
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};
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