source: trunk/essentials/dev-lang/python/Mac/Modules/MacOS.c

/***********************************************************
Copyright 1991-1997 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* Macintosh OS-specific interface */

#include "Python.h"
#include "pymactoolbox.h"

#include <Carbon/Carbon.h>
#include <ApplicationServices/ApplicationServices.h>

static PyObject *MacOS_Error; /* Exception MacOS.Error */

#define PATHNAMELEN 1024

/* ----------------------------------------------------- */

/* Declarations for objects of type Resource fork */

typedef struct {
        PyObject_HEAD
        short fRefNum;
        int isclosed;
} rfobject;

static PyTypeObject Rftype;



/* ---------------------------------------------------------------- */

static void
do_close(rfobject *self)
{
        if (self->isclosed ) return;
        (void)FSClose(self->fRefNum);
        self->isclosed = 1;
}

static char rf_read__doc__[] = 
"Read data from resource fork"
;

static PyObject *
rf_read(rfobject *self, PyObject *args)
{
        long n;
        PyObject *v;
        OSErr err;
        
        if (self->isclosed) {
                PyErr_SetString(PyExc_ValueError, "Operation on closed file");
                return NULL;
        }
        
        if (!PyArg_ParseTuple(args, "l", &n))
                return NULL;
                
        v = PyString_FromStringAndSize((char *)NULL, n);
        if (v == NULL)
                return NULL;
                
        err = FSRead(self->fRefNum, &n, PyString_AsString(v));
        if (err && err != eofErr) {
                PyMac_Error(err);
                Py_DECREF(v);
                return NULL;
        }
        _PyString_Resize(&v, n);
        return v;
}


static char rf_write__doc__[] = 
"Write to resource fork"
;

static PyObject *
rf_write(rfobject *self, PyObject *args)
{
        char *buffer;
        long size;
        OSErr err;
        
        if (self->isclosed) {
                PyErr_SetString(PyExc_ValueError, "Operation on closed file");
                return NULL;
        }
        if (!PyArg_ParseTuple(args, "s#", &buffer, &size))
                return NULL;
        err = FSWrite(self->fRefNum, &size, buffer);
        if (err) {
                PyMac_Error(err);
                return NULL;
        }
        Py_INCREF(Py_None);
        return Py_None;
}


static char rf_seek__doc__[] = 
"Set file position"
;

static PyObject *
rf_seek(rfobject *self, PyObject *args)
{
        long amount, pos;
        int whence = SEEK_SET;
        long eof;
        OSErr err;
        
        if (self->isclosed) {
                PyErr_SetString(PyExc_ValueError, "Operation on closed file");
                return NULL;
        }
        if (!PyArg_ParseTuple(args, "l|i", &amount, &whence))
                return NULL;
        
        if ((err = GetEOF(self->fRefNum, &eof)))
                goto ioerr;
        
        switch (whence) {
        case SEEK_CUR:
                if ((err = GetFPos(self->fRefNum, &pos)))
                        goto ioerr; 
                break;
        case SEEK_END:
                pos = eof;
                break;
        case SEEK_SET:
                pos = 0;
                break;
        default:
                PyErr_BadArgument();
                return NULL;
        }
        
        pos += amount;
        
        /* Don't bother implementing seek past EOF */
        if (pos > eof || pos < 0) {
                PyErr_BadArgument();
                return NULL;
        }
        
        if ((err = SetFPos(self->fRefNum, fsFromStart, pos)) ) {
ioerr:
                PyMac_Error(err);
                return NULL;
        }
        Py_INCREF(Py_None);
        return Py_None;
}


static char rf_tell__doc__[] = 
"Get file position"
;

static PyObject *
rf_tell(rfobject *self, PyObject *args)
{
        long where;
        OSErr err;
        
        if (self->isclosed) {
                PyErr_SetString(PyExc_ValueError, "Operation on closed file");
                return NULL;
        }
        if (!PyArg_ParseTuple(args, ""))
                return NULL;
        if ((err = GetFPos(self->fRefNum, &where)) ) {
                PyMac_Error(err);
                return NULL;
        }
        return PyInt_FromLong(where);
}

static char rf_close__doc__[] = 
"Close resource fork"
;

static PyObject *
rf_close(rfobject *self, PyObject *args)
{
        if (!PyArg_ParseTuple(args, ""))
                return NULL;
        do_close(self);
        Py_INCREF(Py_None);
        return Py_None;
}


static struct PyMethodDef rf_methods[] = {
 {"read",       (PyCFunction)rf_read,   1,      rf_read__doc__},
 {"write",      (PyCFunction)rf_write,  1,      rf_write__doc__},
 {"seek",       (PyCFunction)rf_seek,   1,      rf_seek__doc__},
 {"tell",       (PyCFunction)rf_tell,   1,      rf_tell__doc__},
 {"close",      (PyCFunction)rf_close,  1,      rf_close__doc__},
 
        {NULL,          NULL}           /* sentinel */
};

/* ---------- */


static rfobject *
newrfobject(void)
{
        rfobject *self;
        
        self = PyObject_NEW(rfobject, &Rftype);
        if (self == NULL)
                return NULL;
        self->isclosed = 1;
        return self;
}


static void
rf_dealloc(rfobject *self)
{
        do_close(self);
        PyObject_DEL(self);
}

static PyObject *
rf_getattr(rfobject *self, char *name)
{
        return Py_FindMethod(rf_methods, (PyObject *)self, name);
}

static char Rftype__doc__[] = 
"Resource fork file object"
;

static PyTypeObject Rftype = {
        PyObject_HEAD_INIT(&PyType_Type)
        0,                              /*ob_size*/
        "MacOS.ResourceFork",           /*tp_name*/
        sizeof(rfobject),               /*tp_basicsize*/
        0,                              /*tp_itemsize*/
        /* methods */
        (destructor)rf_dealloc, /*tp_dealloc*/
        (printfunc)0,           /*tp_print*/
        (getattrfunc)rf_getattr,        /*tp_getattr*/
        (setattrfunc)0, /*tp_setattr*/
        (cmpfunc)0,             /*tp_compare*/
        (reprfunc)0,            /*tp_repr*/
        0,                      /*tp_as_number*/
        0,              /*tp_as_sequence*/