Patch from Trent Mick:
The seek() method is broken for any 'whence' value (seek from start, current, orend) other than the default. I have a patch that fixes that as well as gets mmap'd files working on Linux64 and Win64.
This commit is contained in:
Andrew M. Kuchling
parent
9bc5f3339a
commit
70d2742fce
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@ -45,7 +45,7 @@ typedef struct {
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#ifdef MS_WIN32
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HANDLE map_handle;
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HFILE file_handle;
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INT_PTR file_handle;
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char * tagname;
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#endif
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@ -123,7 +123,7 @@ mmap_read_byte_method (mmap_object * self,
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple(args, ":read_byte"))
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return NULL;
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if (self->pos >= 0 && self->pos < self->size) {
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if (self->pos < self->size) {
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where = self->data + self->pos;
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value = (char) *(where);
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self->pos += 1;
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@ -153,7 +153,7 @@ mmap_read_line_method (mmap_object * self,
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else
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++eol; /* we're interested in the position after the
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newline. */
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result = PyString_FromStringAndSize(start, (long) (eol - start));
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result = PyString_FromStringAndSize(start, (eol - start));
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self->pos += (eol - start);
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return (result);
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}
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@ -182,12 +182,12 @@ static PyObject *
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mmap_find_method (mmap_object *self,
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PyObject *args)
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{
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long start = self->pos;
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int start = self->pos;
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char * needle;
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int len;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple (args, "s#|l", &needle, &len, &start)) {
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if (!PyArg_ParseTuple (args, "s#|i", &needle, &len, &start)) {
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return NULL;
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} else {
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char * p = self->data+self->pos;
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@ -200,8 +200,8 @@ mmap_find_method (mmap_object *self,
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}
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if (!*n) {
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return Py_BuildValue (
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"l",
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(long) (p - (self->data + start)));
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"i",
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(int) (p - (self->data + start)));
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}
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p++;
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}
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@ -255,7 +255,7 @@ mmap_size_method (mmap_object * self,
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return NULL;
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#ifdef MS_WIN32
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if (self->file_handle != (HFILE) 0xFFFFFFFF) {
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if (self->file_handle != (INT_PTR) -1) {
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return (Py_BuildValue (
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"l",
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GetFileSize ((HANDLE)self->file_handle, NULL)));
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@ -401,39 +401,44 @@ mmap_flush_method (mmap_object * self, PyObject * args)
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static PyObject *
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mmap_seek_method (mmap_object * self, PyObject * args)
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{
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/* ptrdiff_t dist; */
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long dist;
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int dist;
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int how=0;
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CHECK_VALID(NULL);
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if (!PyArg_ParseTuple (args, "l|i", &dist, &how)) {
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if (!PyArg_ParseTuple (args, "i|i", &dist, &how)) {
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return(NULL);
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} else {
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unsigned long where;
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size_t where;
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switch (how) {
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case 0:
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case 0: /* relative to start */
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if (dist < 0)
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goto onoutofrange;
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where = dist;
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break;
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case 1:
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case 1: /* relative to current position */
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if ((int)self->pos + dist < 0)
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goto onoutofrange;
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where = self->pos + dist;
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break;
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case 2:
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where = self->size - dist;
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case 2: /* relative to end */
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if ((int)self->size + dist < 0)
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goto onoutofrange;
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where = self->size + dist;
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break;
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default:
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PyErr_SetString (PyExc_ValueError,
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"unknown seek type");
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return NULL;
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}
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if ((where >= 0) && (where < (self->size))) {
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self->pos = where;
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Py_INCREF (Py_None);
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return (Py_None);
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} else {
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PyErr_SetString (PyExc_ValueError,
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"seek out of range");
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return NULL;
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}
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if (where > self->size)
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goto onoutofrange;
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self->pos = where;
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Py_INCREF (Py_None);
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return (Py_None);
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}
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onoutofrange:
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PyErr_SetString (PyExc_ValueError, "seek out of range");
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return NULL;
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}
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static PyObject *
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@ -704,23 +709,84 @@ static PyTypeObject mmap_object_type = {
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0, /*tp_doc*/
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};
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/* extract the map size from the given PyObject
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The map size is restricted to [0, INT_MAX] because this is the current
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Python limitation on object sizes. Although the mmap object *could* handle
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a larger map size, there is no point because all the useful operations
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(len(), slicing(), sequence indexing) are limited by a C int.
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Returns -1 on error, with an apprpriate Python exception raised. On
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success, the map size is returned. */
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static int
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_GetMapSize(o)
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PyObject *o;
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{
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if (PyInt_Check(o)) {
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long i = PyInt_AsLong(o);
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if (PyErr_Occurred())
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return -1;
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if (i < 0)
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goto onnegoverflow;
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if (i > INT_MAX)
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goto onposoverflow;
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return (int)i;
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}
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else if (PyLong_Check(o)) {
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long i = PyLong_AsLong(o);
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if (PyErr_Occurred()) {
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/* yes negative overflow is mistaken for positive overflow
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but not worth the trouble to check sign of 'i' */
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if (PyErr_ExceptionMatches(PyExc_OverflowError))
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goto onposoverflow;
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else
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return -1;
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}
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if (i < 0)
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goto onnegoverflow;
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if (i > INT_MAX)
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goto onposoverflow;
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return (int)i;
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}
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else {
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PyErr_SetString(PyExc_TypeError,
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"map size must be an integral value");
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return -1;
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}
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onnegoverflow:
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PyErr_SetString(PyExc_OverflowError,
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"memory mapped size must be positive");
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return -1;
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onposoverflow:
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PyErr_SetString(PyExc_OverflowError,
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"memory mapped size is too large (limited by C int)");
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return -1;
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}
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#ifdef UNIX
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static PyObject *
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new_mmap_object (PyObject * self, PyObject * args, PyObject *kwdict)
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{
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mmap_object * m_obj;
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unsigned long map_size;
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PyObject *map_size_obj = NULL;
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int map_size;
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int fd, flags = MAP_SHARED, prot = PROT_WRITE | PROT_READ;
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char * filename;
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int namelen;
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char *keywords[] = {"file", "size", "flags", "prot", NULL};
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if (!PyArg_ParseTupleAndKeywords(args, kwdict,
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"il|ii", keywords,
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&fd, &map_size, &flags, &prot)
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"iO|ii", keywords,
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&fd, &map_size_obj, &flags, &prot)
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)
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return NULL;
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map_size = _GetMapSize(map_size_obj);
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if (map_size < 0)
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return NULL;
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m_obj = PyObject_New (mmap_object, &mmap_object_type);
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if (m_obj == NULL) {return NULL;}
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m_obj->size = (size_t) map_size;
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@ -744,24 +810,29 @@ static PyObject *
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new_mmap_object (PyObject * self, PyObject * args)
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{
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mmap_object * m_obj;
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unsigned long map_size;
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PyObject *map_size_obj = NULL;
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int map_size;
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char * tagname = "";
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DWORD dwErr = 0;
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int fileno;
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HFILE fh = 0;
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INT_PTR fh = 0;
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/* Patch the object type */
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mmap_object_type.ob_type = &PyType_Type;
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if (!PyArg_ParseTuple(args,
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"il|z",
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"iO|z",
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&fileno,
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&map_size,
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&map_size_obj,
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&tagname)
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)
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return NULL;
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map_size = _GetMapSize(map_size_obj);
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if (map_size < 0)
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return NULL;
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/* if an actual filename has been specified */
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if (fileno != 0) {
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fh = _get_osfhandle(fileno);
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@ -784,7 +855,7 @@ new_mmap_object (PyObject * self, PyObject * args)
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}
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}
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else {
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m_obj->file_handle = (HFILE) 0xFFFFFFFF;
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m_obj->file_handle = (INT_PTR) -1;
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m_obj->size = map_size;
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}
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