Type Function LimitedReader [src]

Alias for std.io.limited_reader.LimitedReader

Prototype

pub fn LimitedReader(comptime ReaderType: type) type

Parameters

ReaderType: type

Source

  pub fn LimitedReader(comptime ReaderType: type) type {
    return struct {
        inner_reader: ReaderType,
        bytes_left: u64,

        pub const Error = ReaderType.Error;
        pub const Reader = io.Reader(*Self, Error, read);

        const Self = @This();

        pub fn read(self: *Self, dest: []u8) Error!usize {
            const max_read = @min(self.bytes_left, dest.len);
            const n = try self.inner_reader.read(dest[0..max_read]);
            self.bytes_left -= n;
            return n;
        }

        pub fn reader(self: *Self) Reader {
            return .{ .context = self };
        }
    };
}  