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decoder.c
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decoder.c
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/*------------------------------------------------------------------------
* Copyright 2009 (c) Jeff Brown <spadix@users.sourceforge.net>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with the ZBar Bar Code Reader; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* http://sourceforge.net/projects/zbar
*------------------------------------------------------------------------*/
#include "zbarmodule.h"
static char decoder_doc[] = PyDoc_STR(
"low level decode of measured bar/space widths.\n"
"\n"
"FIXME.");
static zbarDecoder*
decoder_new (PyTypeObject *type,
PyObject *args,
PyObject *kwds)
{
static char *kwlist[] = { NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "", kwlist))
return(NULL);
zbarDecoder *self = (zbarDecoder*)type->tp_alloc(type, 0);
if(!self)
return(NULL);
self->zdcode = zbar_decoder_create();
zbar_decoder_set_userdata(self->zdcode, self);
if(!self->zdcode) {
Py_DECREF(self);
return(NULL);
}
return(self);
}
static int
decoder_traverse (zbarDecoder *self,
visitproc visit,
void *arg)
{
Py_VISIT(self->handler);
Py_VISIT(self->args);
return(0);
}
static int
decoder_clear (zbarDecoder *self)
{
zbar_decoder_set_handler(self->zdcode, NULL);
zbar_decoder_set_userdata(self->zdcode, NULL);
Py_CLEAR(self->handler);
Py_CLEAR(self->args);
return(0);
}
static void
decoder_dealloc (zbarDecoder *self)
{
decoder_clear(self);
zbar_decoder_destroy(self->zdcode);
((PyObject*)self)->ob_type->tp_free((PyObject*)self);
}
static zbarEnumItem*
decoder_get_color (zbarDecoder *self,
void *closure)
{
zbar_color_t zcol = zbar_decoder_get_color(self->zdcode);
assert(zcol == ZBAR_BAR || zcol == ZBAR_SPACE);
zbarEnumItem *color = color_enum[zcol];
Py_INCREF((PyObject*)color);
return(color);
}
static zbarEnumItem*
decoder_get_type (zbarDecoder *self,
void *closure)
{
zbar_symbol_type_t sym = zbar_decoder_get_type(self->zdcode);
if(sym == ZBAR_NONE) {
/* hardcode most common case */
Py_INCREF((PyObject*)symbol_NONE);
return(symbol_NONE);
}
return(zbarSymbol_LookupEnum(sym));
}
static PyObject*
decoder_get_data (zbarDecoder *self,
void *closure)
{
return(PyString_FromStringAndSize(zbar_decoder_get_data(self->zdcode),
zbar_decoder_get_data_length(self->zdcode)));
}
static PyGetSetDef decoder_getset[] = {
{ "color", (getter)decoder_get_color, },
{ "type", (getter)decoder_get_type, },
{ "data", (getter)decoder_get_data, },
{ NULL, },
};
static PyObject*
decoder_set_config (zbarDecoder *self,
PyObject *args,
PyObject *kwds)
{
zbar_symbol_type_t sym = ZBAR_NONE;
zbar_config_t cfg = ZBAR_CFG_ENABLE;
int val = 1;
static char *kwlist[] = { "symbology", "config", "value", NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "|iii", kwlist,
&sym, &cfg, &val))
return(NULL);
if(zbar_decoder_set_config(self->zdcode, sym, cfg, val)) {
PyErr_SetString(PyExc_ValueError, "invalid configuration setting");
return(NULL);
}
Py_RETURN_NONE;
}
static PyObject*
decoder_parse_config (zbarDecoder *self,
PyObject *args,
PyObject *kwds)
{
const char *cfg = NULL;
static char *kwlist[] = { "config", NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, &cfg))
return(NULL);
if(zbar_decoder_parse_config(self->zdcode, cfg)) {
PyErr_Format(PyExc_ValueError, "invalid configuration setting: %s",
cfg);
return(NULL);
}
Py_RETURN_NONE;
}
static PyObject*
decoder_reset (zbarDecoder *self,
PyObject *args,
PyObject *kwds)
{
static char *kwlist[] = { NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "", kwlist))
return(NULL);
zbar_decoder_reset(self->zdcode);
Py_RETURN_NONE;
}
static PyObject*
decoder_new_scan (zbarDecoder *self,
PyObject *args,
PyObject *kwds)
{
static char *kwlist[] = { NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "", kwlist))
return(NULL);
zbar_decoder_new_scan(self->zdcode);
Py_RETURN_NONE;
}
void
decode_handler (zbar_decoder_t *zdcode)
{
assert(zdcode);
zbarDecoder *self = zbar_decoder_get_userdata(zdcode);
assert(self);
assert(self->zdcode == zdcode);
assert(self->handler);
assert(self->args);
PyObject *junk = PyObject_Call(self->handler, self->args, NULL);
Py_XDECREF(junk);
}
static PyObject*
decoder_set_handler (zbarDecoder *self,
PyObject *args,
PyObject *kwds)
{
PyObject *handler = Py_None;
PyObject *closure = Py_None;
static char *kwlist[] = { "handler", "closure", NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "|OO", kwlist,
&handler, &closure))
return(NULL);
if(handler != Py_None && !PyCallable_Check(handler)) {
PyErr_Format(PyExc_ValueError, "handler %.50s is not callable",
handler->ob_type->tp_name);
return(NULL);
}
Py_CLEAR(self->handler);
Py_CLEAR(self->args);
if(handler != Py_None) {
self->args = PyTuple_New(2);
if(!self->args)
return(NULL);
Py_INCREF(self);
Py_INCREF(closure);
PyTuple_SET_ITEM(self->args, 0, (PyObject*)self);
PyTuple_SET_ITEM(self->args, 1, closure);
Py_INCREF(handler);
self->handler = handler;
zbar_decoder_set_handler(self->zdcode, decode_handler);
}
else {
self->handler = self->args = NULL;
zbar_decoder_set_handler(self->zdcode, NULL);
}
Py_RETURN_NONE;
}
static zbarEnumItem*
decoder_decode_width (zbarDecoder *self,
PyObject *args,
PyObject *kwds)
{
unsigned int width = 0;
static char *kwlist[] = { "width", NULL };
if(!PyArg_ParseTupleAndKeywords(args, kwds, "I", kwlist, &width))
return(NULL);
zbar_symbol_type_t sym = zbar_decode_width(self->zdcode, width);
if(PyErr_Occurred())
/* propagate errors during callback */
return(NULL);
if(sym == ZBAR_NONE) {
/* hardcode most common case */
Py_INCREF((PyObject*)symbol_NONE);
return(symbol_NONE);
}
return(zbarSymbol_LookupEnum(sym));
}
static PyMethodDef decoder_methods[] = {
{ "set_config", (PyCFunction)decoder_set_config,
METH_VARARGS | METH_KEYWORDS, },
{ "parse_config", (PyCFunction)decoder_parse_config,
METH_VARARGS | METH_KEYWORDS, },
{ "reset", (PyCFunction)decoder_reset,
METH_VARARGS | METH_KEYWORDS, },
{ "new_scan", (PyCFunction)decoder_new_scan,
METH_VARARGS | METH_KEYWORDS, },
{ "set_handler", (PyCFunction)decoder_set_handler,
METH_VARARGS | METH_KEYWORDS, },
{ "decode_width", (PyCFunction)decoder_decode_width,
METH_VARARGS | METH_KEYWORDS, },
{ NULL, },
};
PyTypeObject zbarDecoder_Type = {
PyObject_HEAD_INIT(NULL)
.tp_name = "zbar.Decoder",
.tp_doc = decoder_doc,
.tp_basicsize = sizeof(zbarDecoder),
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
Py_TPFLAGS_HAVE_GC,
.tp_new = (newfunc)decoder_new,
.tp_traverse = (traverseproc)decoder_traverse,
.tp_clear = (inquiry)decoder_clear,
.tp_dealloc = (destructor)decoder_dealloc,
.tp_getset = decoder_getset,
.tp_methods = decoder_methods,
};