Function is_code_page_present

Lib/test/test_codecs.py:40–58

(cp)

# On small versions of Windows like Windows IoT or Windows Nano Server not all codepages are present
def is_code_page_present(cp):
    from ctypes import POINTER, WINFUNCTYPE, WinDLL, Structure
    from ctypes.wintypes import BOOL, BYTE, WCHAR, UINT, DWORD

    MAX_LEADBYTES = 12  # 5 ranges, 2 bytes ea., 0 term.
    MAX_DEFAULTCHAR = 2 # single or double byte
    MAX_PATH = 260
    class CPINFOEXW(Structure):
        _fields_ = [("MaxCharSize", UINT),
                    ("DefaultChar", BYTE*MAX_DEFAULTCHAR),
                    ("LeadByte", BYTE*MAX_LEADBYTES),
                    ("UnicodeDefaultChar", WCHAR),
                    ("CodePage", UINT),
                    ("CodePageName", WCHAR*MAX_PATH)]

    prototype = WINFUNCTYPE(BOOL, UINT, DWORD, POINTER(CPINFOEXW))
    GetCPInfoEx = prototype(("GetCPInfoExW", WinDLL("kernel32")))
    info = CPINFOEXW()
    return GetCPInfoEx(cp, 0, info)

class Queue(object):
    """