74 lines
1.9 KiB
Zig
74 lines
1.9 KiB
Zig
const std = @import("std");
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const Backup = @import("backup.zig").Backup;
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const Allocator = std.mem.Allocator;
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const log = std.log.scoped(.GamePak);
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const Self = @This();
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title: [12]u8,
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buf: []u8,
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alloc: Allocator,
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backup: Backup,
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pub fn init(alloc: Allocator, rom_path: []const u8, save_path: ?[]const u8) !Self {
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const file = try std.fs.cwd().openFile(rom_path, .{});
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defer file.close();
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const len = try file.getEndPos();
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const buf = try file.readToEndAlloc(alloc, len);
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const title = parseTitle(buf);
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const kind = Backup.guessKind(buf) orelse .Sram;
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const pak = Self{
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.buf = buf,
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.alloc = alloc,
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.title = title,
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.backup = try Backup.init(alloc, kind, title, save_path),
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};
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pak.parseHeader();
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return pak;
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}
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fn parseHeader(self: *const Self) void {
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const title = parseTitle(self.buf);
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const code = self.buf[0xAC..0xB0];
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const maker = self.buf[0xB0..0xB2];
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const version = self.buf[0xBC];
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log.info("Title: {s}", .{title});
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if (version != 0) log.info("Version: {}", .{version});
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log.info("Game Code: {s}", .{code});
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if (lookupMaker(maker)) |c| log.info("Maker: {s}", .{c}) else log.info("Maker Code: {s}", .{maker});
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}
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fn parseTitle(buf: []u8) [12]u8 {
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return buf[0xA0..0xAC].*;
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}
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fn lookupMaker(slice: *const [2]u8) ?[]const u8 {
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const id = @as(u16, slice[1]) << 8 | @as(u16, slice[0]);
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return switch (id) {
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0x3130 => "Nintendo",
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else => null,
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};
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}
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pub fn deinit(self: Self) void {
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self.alloc.free(self.buf);
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self.backup.deinit();
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}
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pub fn get32(self: *const Self, idx: usize) u32 {
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return (@as(u32, self.get16(idx + 2)) << 16) | @as(u32, self.get16(idx));
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}
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pub fn get16(self: *const Self, idx: usize) u16 {
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return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]);
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}
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pub fn get8(self: *const Self, idx: usize) u8 {
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return self.buf[idx];
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}
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