49 lines
1.3 KiB
Zig
49 lines
1.3 KiB
Zig
const std = @import("std");
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const Allocator = std.mem.Allocator;
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const Self = @This();
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buf: ?[]u8,
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alloc: Allocator,
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pub fn init(alloc: Allocator, maybe_path: ?[]const u8) !Self {
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var buf: ?[]u8 = null;
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if (maybe_path) |path| {
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const file = try std.fs.cwd().openFile(path, .{});
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defer file.close();
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const len = try file.getEndPos();
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buf = try file.readToEndAlloc(alloc, len);
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}
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return Self{
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.buf = buf,
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.alloc = alloc,
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};
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}
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pub fn deinit(self: Self) void {
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if (self.buf) |buf| self.alloc.free(buf);
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}
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pub fn get32(self: *const Self, idx: usize) u32 {
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if (self.buf) |buf|
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return (@as(u32, buf[idx + 3]) << 24) | (@as(u32, buf[idx + 2]) << 16) | (@as(u32, buf[idx + 1]) << 8) | (@as(u32, buf[idx]));
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std.debug.panic("[CPU|BIOS:32] ZBA tried to read from 0x{X:0>8} but no BIOS was provided.", .{idx});
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}
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pub fn get16(self: *const Self, idx: usize) u16 {
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if (self.buf) |buf|
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return (@as(u16, buf[idx + 1]) << 8) | @as(u16, buf[idx]);
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std.debug.panic("[CPU|BIOS:16] ZBA tried to read from 0x{X:0>8} but no BIOS was provided.", .{idx});
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}
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pub fn get8(self: *const Self, idx: usize) u8 {
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if (self.buf) |buf|
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return buf[idx];
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std.debug.panic("[CPU|BIOS:8] ZBA tried to read from 0x{X:0>8} but no BIOS was provided.", .{idx});
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}
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