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import io
import sys
from ctypes import Structure, POINTER, CFUNCTYPE, c_int, c_size_t, c_void_p, \
c_char_p, memmove, string_at, Union, _Pointer
from .dll import _bind, version
from .stdinc import Sint64, Uint8, Uint16, Uint32, Uint64, SDL_bool
__all__ = [
# Structs
"SDL_RWops",
# Defines
"SDL_RWOPS_UNKNOWN", "SDL_RWOPS_WINFILE", "SDL_RWOPS_STDFILE",
"SDL_RWOPS_JNIFILE", "SDL_RWOPS_MEMORY", "SDL_RWOPS_MEMORY_RO",
"RW_SEEK_SET", "RW_SEEK_CUR", "RW_SEEK_END",
# Functions
"SDL_RWFromFile", "SDL_RWFromFP", "SDL_RWFromMem", "SDL_RWFromConstMem",
"SDL_AllocRW", "SDL_FreeRW", "SDL_RWsize", "SDL_RWseek",
"SDL_RWtell", "SDL_RWread", "SDL_RWwrite", "SDL_RWclose",
"SDL_LoadFile_RW", "SDL_LoadFile",
"SDL_ReadU8", "SDL_ReadLE16", "SDL_ReadBE16", "SDL_ReadLE32",
"SDL_ReadBE32", "SDL_ReadLE64", "SDL_ReadBE64", "SDL_WriteU8",
"SDL_WriteLE16", "SDL_WriteBE16", "SDL_WriteLE32", "SDL_WriteBE32",
"SDL_WriteLE64", "SDL_WriteBE64",
# Python Functions
"rw_from_object"
]
SDL_RWOPS_UNKNOWN = 0
SDL_RWOPS_WINFILE = 1
SDL_RWOPS_STDFILE = 2
SDL_RWOPS_JNIFILE = 3
SDL_RWOPS_MEMORY = 4
SDL_RWOPS_MEMORY_RO = 5
class SDL_RWops(Structure):
pass
class _hidden(Union):
pass
_sdlsize = CFUNCTYPE(Sint64, POINTER(SDL_RWops))
_sdlseek = CFUNCTYPE(Sint64, POINTER(SDL_RWops), Sint64, c_int)
_sdlread = CFUNCTYPE(c_size_t, POINTER(SDL_RWops), c_void_p, c_size_t, c_size_t)
_sdlwrite = CFUNCTYPE(c_size_t, POINTER(SDL_RWops), c_void_p, c_size_t, c_size_t)
_sdlclose = CFUNCTYPE(c_int, POINTER(SDL_RWops))
SDL_RWops._fields_ = [("size", _sdlsize),
("seek", _sdlseek),
("read", _sdlread),
("write", _sdlwrite),
("close", _sdlclose),
("type", Uint32),
("hidden", _hidden)
]
SDL_RWFromFile = _bind("SDL_RWFromFile", [c_char_p, c_char_p], POINTER(SDL_RWops))
SDL_RWFromFP = _bind("SDL_RWFromFP", [c_void_p, SDL_bool], POINTER(SDL_RWops))
SDL_RWFromMem = _bind("SDL_RWFromMem", [c_void_p, c_int], POINTER(SDL_RWops))
SDL_RWFromConstMem = _bind("SDL_RWFromConstMem", [c_void_p, c_int], POINTER(SDL_RWops))
SDL_AllocRW = _bind("SDL_AllocRW", None, POINTER(SDL_RWops))
SDL_FreeRW = _bind("SDL_FreeRW", [POINTER(SDL_RWops)])
SDL_LoadFile_RW = _bind("SDL_LoadFile_RW", [POINTER(SDL_RWops), POINTER(c_size_t), c_int], c_void_p, added='2.0.6')
# SDL_LoadFile was a macro in SDL <= 2.0.9, added as a function in 2.0.10
if version >= 2010:
SDL_LoadFile = _bind("SDL_LoadFile", [c_char_p, POINTER(c_size_t)], c_void_p)
else:
SDL_LoadFile = lambda fname, ds: SDL_LoadFile_RW(SDL_RWFromFile(fname, "rb"), ds, 1)
RW_SEEK_SET = 0
RW_SEEK_CUR = 1
RW_SEEK_END = 2
def _ptr2obj(ptr):
"""If a pointer, returns its contents. Otherwise, returns the passed object.
"""
if isinstance(ptr, _Pointer):
return ptr.contents
return ptr
# The following set of functions were macros in SDL <= 2.0.9 but became full
# functions in SDL 2.0.10. Lambda functions are to mimic macro behaviour with
# earlier SDL2 versions.
if version >= 2010:
SDL_RWsize = _bind("SDL_RWsize", [POINTER(SDL_RWops)], Sint64)
SDL_RWseek = _bind("SDL_RWseek", [POINTER(SDL_RWops), Sint64, c_int], Sint64)
SDL_RWtell = _bind("SDL_RWtell", [POINTER(SDL_RWops)], Sint64)
SDL_RWread = _bind("SDL_RWread", [POINTER(SDL_RWops), c_void_p, c_size_t, c_size_t], c_size_t)
SDL_RWwrite = _bind("SDL_RWwrite", [POINTER(SDL_RWops), c_void_p, c_size_t, c_size_t], c_size_t)
SDL_RWclose = _bind("SDL_RWclose", [POINTER(SDL_RWops)], c_int)
else:
_p = _ptr2obj # allow pointers to be passed directly to these functions
SDL_RWsize = lambda ctx: _p(ctx).size(_p(ctx))
SDL_RWseek = lambda ctx, offset, whence: _p(ctx).seek(_p(ctx), offset, whence)
SDL_RWtell = lambda ctx: _p(ctx).seek(_p(ctx), 0, RW_SEEK_CUR)
SDL_RWread = lambda ctx, ptr, size, n: _p(ctx).read(_p(ctx), ptr, size, n)
SDL_RWwrite = lambda ctx, ptr, size, n: _p(ctx).write(_p(ctx), ptr, size, n)
SDL_RWclose = lambda ctx: _p(ctx).close(_p(ctx))
SDL_ReadU8 = _bind("SDL_ReadU8", [POINTER(SDL_RWops)], Uint8)
SDL_ReadLE16 = _bind("SDL_ReadLE16", [POINTER(SDL_RWops)], Uint16)
SDL_ReadBE16 = _bind("SDL_ReadBE16", [POINTER(SDL_RWops)], Uint16)
SDL_ReadLE32 = _bind("SDL_ReadLE32", [POINTER(SDL_RWops)], Uint32)
SDL_ReadBE32 = _bind("SDL_ReadBE32", [POINTER(SDL_RWops)], Uint32)
SDL_ReadLE64 = _bind("SDL_ReadLE64", [POINTER(SDL_RWops)], Uint64)
SDL_ReadBE64 = _bind("SDL_ReadBE64", [POINTER(SDL_RWops)], Uint64)
SDL_WriteU8 = _bind("SDL_WriteU8", [POINTER(SDL_RWops), Uint8], c_size_t)
SDL_WriteLE16 = _bind("SDL_WriteLE16", [POINTER(SDL_RWops), Uint16], c_size_t)
SDL_WriteBE16 = _bind("SDL_WriteBE16", [POINTER(SDL_RWops), Uint16], c_size_t)
SDL_WriteLE32 = _bind("SDL_WriteLE32", [POINTER(SDL_RWops), Uint32], c_size_t)
SDL_WriteBE32 = _bind("SDL_WriteBE32", [POINTER(SDL_RWops), Uint32], c_size_t)
SDL_WriteLE64 = _bind("SDL_WriteLE64", [POINTER(SDL_RWops), Uint64], c_size_t)
SDL_WriteBE64 = _bind("SDL_WriteBE64", [POINTER(SDL_RWops), Uint64], c_size_t)
if sys.version_info[0] >= 3:
try:
from collections.abc import Callable
except ImportError:
from collections import Callable
callable = lambda x: isinstance(x, Callable)
def rw_from_object(obj):
"""Creats a SDL_RWops from any Python object.
The Python object must at least support the following methods:
read(length) -> data
length is the size in bytes to be read. A call to len(data) must
return the correct amount of bytes for the data, so that
len(data) / [size in bytes for a single element from data] returns
the amount of elements.
Must raise an error on failure.
seek(offset, whence) -> int
offset denotes the offset to move the read/write pointer of the
object to. whence indicates the movement behaviour and can be one
of the following values:
RW_SEEK_SET - move to offset from the start of the file
RW_SEEK_CUR - move by offset from the relative location
RW_SEEK_END - move to offset from the end of the file
If it could not move read/write pointer to the desired location,
an error must be raised.
tell() -> int
Must return the current offset. This method must only be
provided, if seek() does not return any value.
close() -> None
Closes the object(or its internal data access methods). Must raise
an error on failure.
write(data) -> None
Writes the passed data(which is a string of bytes) to the object.
Must raise an error on failure.
Note: The write() method is optional and only necessary, if the passed
object should be able to write data.
The returned SDL_RWops is a pure Python object and must not be freed via
free_rw().
"""
if not hasattr(obj, "read"):
raise TypeError("obj must have a read(len) -> data method")
if not hasattr(obj, "seek") or not callable(obj.seek):
raise TypeError("obj must have a seek(offset, whence) method")
if not hasattr(obj, "close") or not callable(obj.close):
raise TypeError("obj must have a close() -> int method")
rwops = SDL_RWops()
def _rwsize(context):
try:
if hasattr(obj, "size"):
if callable(obj.size):
return obj.size()
else:
return obj.size
else:
cur = obj.seek(0, RW_SEEK_CUR)
length = obj.seek(0, RW_SEEK_END)
obj.seek(cur, RW_SEEK_SET)
return length
except Exception:
#print(e)
return -1
rwops.size = _sdlsize(_rwsize)
def _rwseek(context, offset, whence):
try:
retval = obj.seek(offset, whence)
if retval is None:
retval = obj.tell()
return retval
except Exception:
#print(e)
return -1
rwops.seek = _sdlseek(_rwseek)
def _rwread(context, ptr, size, maxnum):
try:
data = obj.read(size * maxnum)
num = len(data)
memmove(ptr, data, num)
return num // size
except Exception:
#print(e)
return 0
rwops.read = _sdlread(_rwread)
def _rwclose(context):
try:
retval = obj.close()
if retval is None:
# No return value; we assume that everything is okay.
return 0
return retval
except Exception:
#print(e)
return -1
rwops.close = _sdlclose(_rwclose)
def _rwwrite(context, ptr, size, num):
try:
# string_at feels wrong, since we access a raw byte buffer...
retval = obj.write(string_at(ptr, size * num))
if issubclass(type(obj), io.IOBase):
if retval is None: # Means write error
return 0
return retval // size
# If not an io object, try to interpret retval as bytes written
# and, failing that, just assume success if no exception raised
# and return num
try:
return int(retval) // size
except TypeError:
return num
except Exception:
#print(e)
return 0
if hasattr(obj, "write") and callable(obj.write):
rwops.write = _sdlwrite(_rwwrite)
else:
rwops.write = _sdlwrite()
return rwops
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