style(backup): refactor code

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-10 11:54:37 -03:00
parent 8028394105
commit b5d8a65e69
2 changed files with 117 additions and 131 deletions

View File

@ -189,7 +189,7 @@ pub fn init(allocator: Allocator, cpu: *Arm7tdmi, rom_path: []const u8, save_pat
const file_buf = try file.readToEndAlloc(allocator, try file.getEndPos());
const title = file_buf[0xA0..0xAC].*;
const kind = Backup.guessKind(file_buf);
const kind = Backup.guess(file_buf);
const device = if (force_rtc) .Rtc else guessDevice(file_buf);
logHeader(file_buf, &title);

View File

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