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# frozen_string_literal: true
require 'ffi'
FFI.typedef :uint16, :word
FFI.typedef :uint32, :dword
FFI.typedef :uintptr_t, :handle
FFI.typedef :buffer_inout, :lpwstr
FFI.typedef :pointer, :lpcvoid
FFI.typedef :pointer, :lpvoid
FFI.typedef :pointer, :lpdword
FFI.typedef :pointer, :pdword
FFI.typedef :pointer, :phandle
FFI.typedef :pointer, :pbool
FFI.typedef :pointer, :ulong_ptr
FFI.typedef :uint32, :win32_ulong
FFI.typedef :int32, :win32_long
FFI.typedef :int32, :win32_bool
FFI.typedef :uint16, :wchar
FFI.typedef :uintptr_t, :hwnd
ERROR_MORE_DATA = 234
MAX_PATH = 32_767
module FFI
WIN32FALSE = 0
END_OF_WCHAR_STRING = (+"\0\0").force_encoding(Encoding::UTF_16LE).freeze
class Pointer
def read_wide_string_with_length(char_length)
# char_length is number of wide chars (typically excluding NULLs), *not* bytes
str = get_bytes(0, char_length * 2).force_encoding(Encoding::UTF_16LE)
str.encode(Encoding::UTF_8, str.encoding)
end
def read_wide_string_without_length(replace_invalid_chars: false)
wide_character = get_bytes(0, 2)
wide_character.force_encoding(Encoding::UTF_16LE)
i = 2
str = []
while wide_character != END_OF_WCHAR_STRING
str << wide_character
wide_character = get_bytes(i, 2)
wide_character.force_encoding(Encoding::UTF_16LE)
i += 2
end
if replace_invalid_chars
str.join.force_encoding(Encoding::UTF_16LE).encode(Encoding::UTF_8, Encoding::UTF_16LE, invalid: :replace)
else
str.join.force_encoding(Encoding::UTF_16LE).encode(Encoding::UTF_8)
end
end
def read_win32_bool
# BOOL is always a 32-bit integer in Win32
# some Win32 APIs return 1 for true, while others are non-0
read_int32 != WIN32FALSE
end
end
class Struct
def self.read_list(first_address)
instance = new(first_address)
while instance.to_ptr != Pointer::NULL
yield(instance)
instance = new(instance[:Next])
end
end
end
end
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20 entries across 20 versions & 1 rubygems