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View File Name : commontypes.py

import sys
from . import model
from .error import FFIError


COMMON_TYPES = {}

try:
    # fetch "bool" and all simple Windows types
    from _cffi_backend import _get_common_types
    _get_common_types(COMMON_TYPES)
except ImportError:
    pass

COMMON_TYPES['FILE'] = model.unknown_type('FILE', '_IO_FILE')
COMMON_TYPES['bool'] = '_Bool'    # in case we got ImportError above
COMMON_TYPES['float _Complex'] = '_cffi_float_complex_t'
COMMON_TYPES['double _Complex'] = '_cffi_double_complex_t'

for _type in model.PrimitiveType.ALL_PRIMITIVE_TYPES:
    if _type.endswith('_t'):
        COMMON_TYPES[_type] = _type
del _type

_CACHE = {}

def resolve_common_type(parser, commontype):
    try:
        return _CACHE[commontype]
    except KeyError:
        cdecl = COMMON_TYPES.get(commontype, commontype)
        if not isinstance(cdecl, str):
            result, quals = cdecl, 0    # cdecl is already a BaseType
        elif cdecl in model.PrimitiveType.ALL_PRIMITIVE_TYPES:
            result, quals = model.PrimitiveType(cdecl), 0
        elif cdecl == 'set-unicode-needed':
            raise FFIError("The Windows type %r is only available after "
                           "you call ffi.set_unicode()" % (commontype,))
        else:
            if commontype == cdecl:
                raise FFIError(
                    "Unsupported type: %r.  Please look at "
        "http://cffi.readthedocs.io/en/latest/cdef.html#ffi-cdef-limitations "
                    "and file an issue if you think this type should really "
                    "be supported." % (commontype,))
            result, quals = parser.parse_type_and_quals(cdecl)   # recursive

        assert isinstance(result, model.BaseTypeByIdentity)
        _CACHE[commontype] = result, quals
        return result, quals


# ____________________________________________________________
# extra types for Windows (most of them are in commontypes.c)


def win_common_types():
    return {
        "UNICODE_STRING": model.StructType(
            "_UNICODE_STRING",
            ["Length",
             "MaximumLength",
             "Buffer"],
            [model.PrimitiveType("unsigned short"),
             model.PrimitiveType("unsigned short"),
             model.PointerType(model.PrimitiveType("wchar_t"))],
            [-1, -1, -1]),
        "PUNICODE_STRING": "UNICODE_STRING *",
        "PCUNICODE_STRING": "const UNICODE_STRING *",

        "TBYTE": "set-unicode-needed",
        "TCHAR": "set-unicode-needed",
        "LPCTSTR": "set-unicode-needed",
        "PCTSTR": "set-unicode-needed",
        "LPTSTR": "set-unicode-needed",
        "PTSTR": "set-unicode-needed",
        "PTBYTE": "set-unicode-needed",
        "PTCHAR": "set-unicode-needed",
        }

if sys.platform == 'win32':
    COMMON_TYPES.update(win_common_types())