From 5c55017c401002c18b1d43dad61200df17ab3321 Mon Sep 17 00:00:00 2001 From: Uwe Hermann Date: Sat, 24 Apr 2010 01:04:20 +0200 Subject: Various Python decoder infrastructure improvements. - Introduce 'struct sigrokdecode_decoder'. - Decoders are now handled via two C functions: - sigrokdecode_load_decoder(): Fills a 'struct sigrokdecode_decoder'. - sigrokdecode_run_decoder(): Runs a decoder function. - There are now two decoder API functions a script needs to implement: - register(): Returns a Python dict with certain metadata. - decode(): Runs the actual decoder code. - libsigrokdecode: Add and use some more #defines for errors: - SIGROKDECODE_ERR_ARGS - SIGROKDECODE_ERR_PYTHON - Various other smaller Python decode script infrastructure issues. --- decode.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 143 insertions(+), 50 deletions(-) (limited to 'decode.c') diff --git a/decode.c b/decode.c index d87f5d2..e6399db 100644 --- a/decode.c +++ b/decode.c @@ -20,6 +20,7 @@ #include /* First, so we avoid a _POSIX_C_SOURCE warning. */ #include +#include /** * Initialize libsigrokdecode. @@ -43,82 +44,174 @@ int sigrokdecode_init(void) return 0; } +/** + * Helper function to handle Python strings. + * + * TODO: @param entries. + * + * @return 0 upon success, non-zero otherwise. The 'outstr' argument will + * point to a malloc()ed string upon success. + */ +static int h_str(PyObject *py_res, PyObject *py_func, PyObject *py_mod, + const char *key, char **outstr) +{ + PyObject *py_str; + char *str; + + py_str = PyMapping_GetItemString(py_res, (char *)key); + if (!py_str || !PyString_Check(py_str)) { + if (PyErr_Occurred()) + PyErr_Print(); + Py_DECREF(py_func); + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + + if (!(str = PyString_AsString(py_str))) { + if (PyErr_Occurred()) + PyErr_Print(); + Py_DECREF(py_str); + Py_DECREF(py_func); + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + + if (!(*outstr = strdup(str))) { + if (PyErr_Occurred()) + PyErr_Print(); + Py_DECREF(py_str); + Py_DECREF(py_func); + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_MALLOC; + } + + Py_DECREF(py_str); + + return 0; +} + /** * TODO * * @param name TODO * @return 0 upon success, non-zero otherwise. */ -int sigrokdecode_load_decoder_file(const char *name) +int sigrokdecode_load_decoder(const char *name, + struct sigrokdecode_decoder **dec) { - /* QUICK HACK */ - name = name; + struct sigrokdecode_decoder *d; + PyObject *py_name, *py_mod, *py_func, *py_res /* , *py_tuple */; + int r; + + /* Get the name of the decoder module as Python string. */ + if (!(py_name = PyString_FromString(name))) { + PyErr_Print(); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + + /* "Import" the Python module. */ + if (!(py_mod = PyImport_Import(py_name))) { + PyErr_Print(); + Py_DECREF(py_name); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + Py_DECREF(py_name); + + /* Get the 'register' function name as Python callable object. */ + py_func = PyObject_GetAttrString(py_mod, "register"); + if (!py_func || !PyCallable_Check(py_func)) { + if (PyErr_Occurred()) + PyErr_Print(); + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + + /* Call the 'register' function without arguments, get the result. */ + if (!(py_res = PyObject_CallFunction(py_func, NULL))) { + PyErr_Print(); + Py_DECREF(py_func); + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + + if (!(d = malloc(sizeof(struct sigrokdecode_decoder)))) + return SIGROKDECODE_ERR_MALLOC; + + if ((r = h_str(py_res, py_func, py_mod, "id", &(d->id))) < 0) + return r; + + if ((r = h_str(py_res, py_func, py_mod, "name", &(d->name))) < 0) + return r; + + if ((r = h_str(py_res, py_func, py_mod, "desc", &(d->desc))) < 0) + return r; + + d->py_mod = py_mod; + + Py_DECREF(py_res); + Py_DECREF(py_func); + + /* Get the 'decode' function name as Python callable object. */ + py_func = PyObject_GetAttrString(py_mod, "decode"); + if (!py_func || !PyCallable_Check(py_func)) { + if (PyErr_Occurred()) + PyErr_Print(); + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ + } + + d->py_func = py_func; + + /* TODO: Handle inputformats, outputformats. */ + + *dec = d; - /* TODO */ return 0; } /** * Run the specified decoder function. * - * @param decodername TODO + * @param dec TODO * @param inbuf TODO * @param inbuflen TODO * @param outbuf TODO * @param outbuflen TODO * @return 0 upon success, non-zero otherwise. */ -int sigrokdecode_run_decoder(const char *modulename, const char *decodername, +int sigrokdecode_run_decoder(struct sigrokdecode_decoder *dec, uint8_t *inbuf, uint64_t inbuflen, uint8_t **outbuf, uint64_t *outbuflen) { - PyObject *py_name, *py_module, *py_func, *py_args; - PyObject *py_value, *py_result; + PyObject *py_mod, *py_func, *py_args, *py_value, *py_res; int ret; /* TODO: Use #defines for the return codes. */ /* Return an error upon unusable input. */ - if (decodername == NULL) - return -1; + if (dec == NULL) + return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */ if (inbuf == NULL) - return -2; + return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */ if (inbuflen == 0) /* No point in working on empty buffers. */ - return -3; + return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */ if (outbuf == NULL) - return -4; + return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */ if (outbuflen == NULL) - return -5; + return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */ - /* Get the name of the decoder module/file as Python string. */ - if (!(py_name = PyString_FromString(modulename))) { - PyErr_Print(); - return -6; - } + /* TODO: Error handling. */ + py_mod = dec->py_mod; + py_func = dec->py_func; - /* "Import" the python file/module. */ - if (!(py_module = PyImport_Import(py_name))) { - PyErr_Print(); - Py_DECREF(py_name); - return -7; - } - Py_DECREF(py_name); - - /* Get the decoder/function name as Python callable object. */ - py_func = PyObject_GetAttrString(py_module, decodername); - if (!py_func || !PyCallable_Check(py_func)) { - if (PyErr_Occurred()) - PyErr_Print(); - Py_DECREF(py_module); - return -8; - } + /* TODO: Really run Py_DECREF on py_mod/py_func? */ /* Create a Python tuple of size 1. */ if (!(py_args = PyTuple_New(1))) { PyErr_Print(); Py_DECREF(py_func); - Py_DECREF(py_module); - return -9; + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ } /* Get the input buffer as Python "string" (byte array). */ @@ -127,8 +220,8 @@ int sigrokdecode_run_decoder(const char *modulename, const char *decodername, PyErr_Print(); Py_DECREF(py_args); Py_DECREF(py_func); - Py_DECREF(py_module); - return -10; + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ } if (PyTuple_SetItem(py_args, 0, py_value) != 0) { @@ -136,35 +229,35 @@ int sigrokdecode_run_decoder(const char *modulename, const char *decodername, Py_DECREF(py_value); Py_DECREF(py_args); Py_DECREF(py_func); - Py_DECREF(py_module); - return -11; + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ } - if (!(py_result = PyObject_CallObject(py_func, py_args))) { + if (!(py_res = PyObject_CallObject(py_func, py_args))) { PyErr_Print(); Py_DECREF(py_value); Py_DECREF(py_args); Py_DECREF(py_func); - Py_DECREF(py_module); - return -12; + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ } - if ((ret = PyObject_AsCharBuffer(py_result, (const char **)outbuf, + if ((ret = PyObject_AsCharBuffer(py_res, (const char **)outbuf, (Py_ssize_t *)outbuflen))) { PyErr_Print(); - Py_DECREF(py_result); + Py_DECREF(py_res); Py_DECREF(py_value); Py_DECREF(py_args); Py_DECREF(py_func); - Py_DECREF(py_module); - return -13; + Py_DECREF(py_mod); + return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */ } - Py_DECREF(py_result); + Py_DECREF(py_res); // Py_DECREF(py_value); Py_DECREF(py_args); Py_DECREF(py_func); - Py_DECREF(py_module); + Py_DECREF(py_mod); return 0; } -- cgit v1.2.3-70-g09d2