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Pillow/map.c
Brian Crowell af5228896a py3k: Add module initialization and unicode/bytes int/long thunks 
This commit:

* Adds Python 3 module initialization functions. I split out the main init
  of each module into a static setup_module function.
* Adds a py3.h which unifies int/long in Python 3 and unicode/bytes in
  Python 2. _imagingft.c unfortunately looks a little kludgy after this
  because it was already using PyUnicode functions, and I had to mix and
  match there manually.

With this commit, the modules all build successfully under Python 3.

What this commit does NOT do is patch all of the uses of PyArg_ParseTuple
and Py_BuildValue, which all need to be checked for proper use of bytes
and unicode codes. It also does not let selftest.py run yet, because there
are probably hundreds of issues to fix in the Python code itself.
2013-01-10 08:46:37 -06:00

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/*
* The Python Imaging Library.
*
* standard memory mapping interface for the Imaging library
*
* history:
* 1998-03-05 fl added Win32 read mapping
* 1999-02-06 fl added "I;16" support
* 2003-04-21 fl added PyImaging_MapBuffer primitive
*
* Copyright (c) 1998-2003 by Secret Labs AB.
* Copyright (c) 2003 by Fredrik Lundh.
*
* See the README file for information on usage and redistribution.
*/
/*
* FIXME: should move the memory mapping primitives into libImaging!
*/
#include "Python.h"
#if PY_VERSION_HEX < 0x01060000
#define PyObject_New PyObject_NEW
#define PyObject_Del PyMem_DEL
#endif
#include "Imaging.h"
#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#undef INT8
#undef UINT8
#undef INT16
#undef UINT16
#undef INT32
#undef INT64
#undef UINT32
#include "windows.h"
#endif
#include "py3.h"
/* compatibility wrappers (defined in _imaging.c) */
extern int PyImaging_CheckBuffer(PyObject* buffer);
extern int PyImaging_GetBuffer(PyObject* buffer, Py_buffer *view);
/* -------------------------------------------------------------------- */
/* Standard mapper */
typedef struct {
PyObject_HEAD
char* base;
int size;
int offset;
#ifdef WIN32
HANDLE hFile;
HANDLE hMap;
#endif
} ImagingMapperObject;
static PyTypeObject ImagingMapperType;
ImagingMapperObject*
PyImaging_MapperNew(const char* filename, int readonly)
{
ImagingMapperObject *mapper;
if (PyType_Ready(&ImagingMapperType) < 0)
return NULL;
mapper = PyObject_New(ImagingMapperObject, &ImagingMapperType);
if (mapper == NULL)
return NULL;
mapper->base = NULL;
mapper->size = mapper->offset = 0;
#ifdef WIN32
mapper->hFile = (HANDLE)-1;
mapper->hMap = (HANDLE)-1;
/* FIXME: currently supports readonly mappings only */
mapper->hFile = CreateFile(
filename,
GENERIC_READ,
FILE_SHARE_READ,
NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (mapper->hFile == (HANDLE)-1) {
PyErr_SetString(PyExc_IOError, "cannot open file");
PyObject_Del(mapper);
return NULL;
}
mapper->hMap = CreateFileMapping(
mapper->hFile, NULL,
PAGE_READONLY,
0, 0, NULL);
if (mapper->hMap == (HANDLE)-1) {
CloseHandle(mapper->hFile);
PyErr_SetString(PyExc_IOError, "cannot map file");
PyObject_Del(mapper);
return NULL;
}
mapper->base = (char*) MapViewOfFile(
mapper->hMap,
FILE_MAP_READ,
0, 0, 0);
mapper->size = GetFileSize(mapper->hFile, 0);
#endif
return mapper;
}
static void
mapping_dealloc(ImagingMapperObject* mapper)
{
#ifdef WIN32
if (mapper->base != 0)
UnmapViewOfFile(mapper->base);
if (mapper->hMap != (HANDLE)-1)
CloseHandle(mapper->hMap);
if (mapper->hFile != (HANDLE)-1)
CloseHandle(mapper->hFile);
mapper->base = 0;
mapper->hMap = mapper->hFile = (HANDLE)-1;
#endif
PyObject_Del(mapper);
}
/* -------------------------------------------------------------------- */
/* standard file operations */
static PyObject*
mapping_read(ImagingMapperObject* mapper, PyObject* args)
{
PyObject* buf;
int size = -1;
if (!PyArg_ParseTuple(args, "|i", &size))
return NULL;
/* check size */
if (size < 0 || mapper->offset + size > mapper->size)
size = mapper->size - mapper->offset;
if (size < 0)
size = 0;
buf = PyBytes_FromStringAndSize(NULL, size);
if (!buf)
return NULL;
if (size > 0) {
memcpy(PyBytes_AsString(buf), mapper->base + mapper->offset, size);
mapper->offset += size;
}
return buf;
}
static PyObject*
mapping_seek(ImagingMapperObject* mapper, PyObject* args)
{
int offset;
int whence = 0;
if (!PyArg_ParseTuple(args, "i|i", &offset, &whence))
return NULL;
switch (whence) {
case 0: /* SEEK_SET */
mapper->offset = offset;
break;
case 1: /* SEEK_CUR */
mapper->offset += offset;
break;
case 2: /* SEEK_END */
mapper->offset = mapper->size + offset;
break;
default:
/* FIXME: raise ValueError? */
break;
}
Py_INCREF(Py_None);
return Py_None;
}
/* -------------------------------------------------------------------- */
/* map entire image */
extern PyObject*PyImagingNew(Imaging im);
static void
ImagingDestroyMap(Imaging im)
{
return; /* nothing to do! */
}
static PyObject*
mapping_readimage(ImagingMapperObject* mapper, PyObject* args)
{
int y, size;
Imaging im;
char* mode;
int xsize;
int ysize;
int stride;
int orientation;
if (!PyArg_ParseTuple(args, "s(ii)ii", &mode, &xsize, &ysize,
&stride, &orientation))
return NULL;
if (stride <= 0) {
/* FIXME: maybe we should call ImagingNewPrologue instead */
if (!strcmp(mode, "L") || !strcmp(mode, "P"))
stride = xsize;
else if (!strcmp(mode, "I;16") || !strcmp(mode, "I;16B"))
stride = xsize * 2;
else
stride = xsize * 4;
}
size = ysize * stride;
if (mapper->offset + size > mapper->size) {
PyErr_SetString(PyExc_IOError, "image file truncated");
return NULL;
}
im = ImagingNewPrologue(mode, xsize, ysize);
if (!im)
return NULL;
/* setup file pointers */
if (orientation > 0)
for (y = 0; y < ysize; y++)
im->image[y] = mapper->base + mapper->offset + y * stride;
else
for (y = 0; y < ysize; y++)
im->image[ysize-y-1] = mapper->base + mapper->offset + y * stride;
im->destroy = ImagingDestroyMap;
if (!ImagingNewEpilogue(im))
return NULL;
mapper->offset += size;
return PyImagingNew(im);
}
static struct PyMethodDef methods[] = {
/* standard file interface */
{"read", (PyCFunction)mapping_read, 1},
{"seek", (PyCFunction)mapping_seek, 1},
/* extensions */
{"readimage", (PyCFunction)mapping_readimage, 1},
{NULL, NULL} /* sentinel */
};
static PyTypeObject ImagingMapperType = {
PyVarObject_HEAD_INIT(NULL, 0)
"ImagingMapper", /*tp_name*/
sizeof(ImagingMapperObject), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
(destructor)mapping_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number */
0, /*tp_as_sequence */
0, /*tp_as_mapping */
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
methods, /*tp_methods*/
0, /*tp_members*/
0, /*tp_getset*/
};
PyObject*
PyImaging_Mapper(PyObject* self, PyObject* args)
{
char* filename;
if (!PyArg_ParseTuple(args, "s", &filename))
return NULL;
return (PyObject*) PyImaging_MapperNew(filename, 1);
}
/* -------------------------------------------------------------------- */
/* Buffer mapper */
typedef struct ImagingBufferInstance {
struct ImagingMemoryInstance im;
PyObject* target;
Py_buffer view;
} ImagingBufferInstance;
static void
mapping_destroy_buffer(Imaging im)
{
ImagingBufferInstance* buffer = (ImagingBufferInstance*) im;
PyBuffer_Release(&buffer->view);
Py_XDECREF(buffer->target);
}
PyObject*
PyImaging_MapBuffer(PyObject* self, PyObject* args)
{
int y, size;
Imaging im;
PyObject* target;
Py_buffer view;
char* mode;
char* codec;
PyObject* bbox;
int offset;
int xsize, ysize;
int stride;
int ystep;
if (!PyArg_ParseTuple(args, "O(ii)sOi(sii)", &target, &xsize, &ysize,
&codec, &bbox, &offset, &mode, &stride, &ystep))
return NULL;
if (!PyImaging_CheckBuffer(target)) {
PyErr_SetString(PyExc_TypeError, "expected string or buffer");
return NULL;
}
if (stride <= 0) {
if (!strcmp(mode, "L") || !strcmp(mode, "P"))
stride = xsize;
else if (!strncmp(mode, "I;16", 4))
stride = xsize * 2;
else
stride = xsize * 4;
}
size = ysize * stride;
/* check buffer size */
if (PyImaging_GetBuffer(target, &view) < 0)
return NULL;
if (view.len < 0) {
PyErr_SetString(PyExc_ValueError, "buffer has negative size");
return NULL;
}
if (offset + size > view.len) {
PyErr_SetString(PyExc_ValueError, "buffer is not large enough");
return NULL;
}
im = ImagingNewPrologueSubtype(
mode, xsize, ysize, sizeof(ImagingBufferInstance)
);
if (!im)
return NULL;
/* setup file pointers */
if (ystep > 0)
for (y = 0; y < ysize; y++)
im->image[y] = view.buf + offset + y * stride;
else
for (y = 0; y < ysize; y++)
im->image[ysize-y-1] = view.buf + offset + y * stride;
im->destroy = mapping_destroy_buffer;
Py_INCREF(target);
((ImagingBufferInstance*) im)->target = target;
((ImagingBufferInstance*) im)->view = view;
if (!ImagingNewEpilogue(im))
return NULL;
return PyImagingNew(im);
}
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