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std/os/uefi: Add methods next() and size() to DevicePathProtocol

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These are used for more easily dealing with a series of Device Path
nodes.
This commit is contained in:
fifty-six 2022-01-11 01:29:35 -05:00 committed by Andrew Kelley
parent 608fceffc4
commit 73e4571b4c
1 changed files with 19 additions and 0 deletions
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19
lib/std/os/uefi/protocols/device_path_protocol.zig
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@ -15,6 +15,25 @@ pub const DevicePathProtocol = packed struct {
.node = [_]u8{ 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b },
};
/// Returns the next DevicePathProtocol node in the sequence, if any.
pub fn next(self: *DevicePathProtocol) ?*DevicePathProtocol {
if (self.type == .End and @intToEnum(EndDevicePath.Subtype, self.subtype) == .EndEntire)
return null;
return @ptrCast(*DevicePathProtocol, @ptrCast([*]u8, self) + self.length);
}
/// Calculates the total length of the device path structure in bytes, including the end of device path node.
pub fn size(self: *DevicePathProtocol) usize {
var node = self;
while (node.next()) |next_node| {
node = next_node;
}
return (@ptrToInt(node) + node.length) - @ptrToInt(self);
}
pub fn getDevicePath(self: *const DevicePathProtocol) ?DevicePath {
return switch (self.type) {
.Hardware => blk: {