zba/src/bus/Bios.zig

36 lines
884 B
Zig

const std = @import("std");
const Allocator = std.mem.Allocator;
const Self = @This();
buf: []u8,
alloc: Allocator,
pub fn init(alloc: Allocator, path: []const u8) !Self {
const file = try std.fs.cwd().openFile(path, .{ .read = true });
defer file.close();
const len = try file.getEndPos();
return Self{
.buf = try file.readToEndAlloc(alloc, len),
.alloc = alloc,
};
}
pub fn deinit(self: Self) void {
self.alloc.free(self.buf);
}
pub fn get32(self: *const Self, idx: usize) u32 {
return (@as(u32, self.buf[idx + 3]) << 24) | (@as(u32, self.buf[idx + 2]) << 16) | (@as(u32, self.buf[idx + 1]) << 8) | (@as(u32, self.buf[idx]));
}
pub fn get16(self: *const Self, idx: usize) u16 {
return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]);
}
pub fn get8(self: *const Self, idx: usize) u8 {
return self.buf[idx];
}