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Diffstat (limited to 'decoder.c')
| -rw-r--r-- | decoder.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/decoder.c b/decoder.c new file mode 100644 index 0000000..7753a33 --- /dev/null +++ b/decoder.c @@ -0,0 +1,224 @@ +/* + * This file is part of the sigrok project. + * + * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> + * Copyright (C) 2011 Bert Vermeulen <bert@biot.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "config.h" +#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */ +#include <dirent.h> + +/* The list of protocol decoders. */ +GSList *list_pds = NULL; +GSList *decoders = NULL; + + +/** + * Returns the list of supported/loaded protocol decoders. + * + * This is a GSList containing the names of the decoders as strings. + * + * @return List of decoders, NULL if none are supported or loaded. + */ +GSList *srd_list_decoders(void) +{ + + return list_pds; +} + + +/** + * Get the decoder with the specified ID. + * + * @param id The ID string of the decoder to return. + * @return The decoder with the specified ID, or NULL if not found. + */ +struct srd_decoder *srd_get_decoder_by_id(const char *id) +{ + GSList *l; + struct srd_decoder *dec; + + for (l = srd_list_decoders(); l; l = l->next) { + dec = l->data; + if (!strcmp(dec->id, id)) + return dec; + } + + return NULL; +} + + +/** + * TODO + * + * @param name TODO + * + * @return SRD_OK upon success, a (negative) error code otherwise. + */ +int srd_load_decoder(const char *name, struct srd_decoder **dec) +{ + struct srd_decoder *d; + PyObject *py_mod, *py_res; + int r; + + fprintf(stdout, "%s: %s\n", __func__, name); + + /* "Import" the Python module. */ + if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */ + PyErr_Print(); /* Returns void. */ + return SRD_ERR_PYTHON; /* TODO: More specific error? */ + } + + /* Get the 'Decoder' class as Python object. */ + py_res = PyObject_GetAttrString(py_mod, "Decoder"); /* NEWREF */ + if (!py_res) { + if (PyErr_Occurred()) + PyErr_Print(); /* Returns void. */ + Py_XDECREF(py_mod); + fprintf(stderr, "Decoder class not found in PD module %s\n", name); + return SRD_ERR_PYTHON; /* TODO: More specific error? */ + } + + if (!(d = malloc(sizeof(struct srd_decoder)))) + return SRD_ERR_MALLOC; + + /* We'll just use the name of the module for the ID. */ + d->id = strdup(name); + + if ((r = h_str(py_res, py_mod, "name", &(d->name))) < 0) + return r; + + if ((r = h_str(py_res, py_mod, "longname", + &(d->longname))) < 0) + return r; + + if ((r = h_str(py_res, py_mod, "desc", &(d->desc))) < 0) + return r; + + if ((r = h_str(py_res, py_mod, "longdesc", + &(d->longdesc))) < 0) + return r; + + if ((r = h_str(py_res, py_mod, "author", &(d->author))) < 0) + return r; + + if ((r = h_str(py_res, py_mod, "email", &(d->email))) < 0) + return r; + + if ((r = h_str(py_res, py_mod, "license", &(d->license))) < 0) + return r; + + d->py_mod = py_mod; + d->py_decobj = py_res; + + /* TODO: Handle func, inputformats, outputformats. */ + /* Note: They must at least be set to NULL, will segfault otherwise. */ + d->func = NULL; + d->inputformats = NULL; + d->outputformats = NULL; + + *dec = d; + + return SRD_OK; +} + + +/** + * TODO + */ +int srd_unload_decoder(struct srd_decoder *dec) +{ + g_free(dec->id); + g_free(dec->name); + g_free(dec->desc); + g_free(dec->func); + + /* TODO: Free everything in inputformats and outputformats. */ + + if (dec->inputformats != NULL) + g_slist_free(dec->inputformats); + if (dec->outputformats != NULL) + g_slist_free(dec->outputformats); + + Py_XDECREF(dec->py_decobj); + Py_XDECREF(dec->py_mod); + + /* TODO: (g_)free dec itself? */ + + return SRD_OK; +} + + +int srd_load_all_decoders(void) +{ + DIR *dir; + struct dirent *dp; + int ret; + char *decodername; + struct srd_decoder *dec; + + if (!(dir = opendir(DECODERS_DIR))) { + Py_Finalize(); /* Returns void. */ + return SRD_ERR_DECODERS_DIR; + } + + while ((dp = readdir(dir)) != NULL) { + /* Ignore filenames which don't end with ".py". */ + if (!g_str_has_suffix(dp->d_name, ".py")) + continue; + + /* Decoder name == filename (without .py suffix). */ + decodername = g_strndup(dp->d_name, strlen(dp->d_name) - 3); + + /* TODO: Error handling. Use g_try_malloc(). */ + if (!(dec = malloc(sizeof(struct srd_decoder)))) { + Py_Finalize(); /* Returns void. */ + return SRD_ERR_MALLOC; + } + + /* Load the decoder. */ + /* TODO: Warning if loading fails for a decoder. */ + if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) { + /* Append it to the list of supported/loaded decoders. */ + list_pds = g_slist_append(list_pds, dec); + } + } + closedir(dir); + + return SRD_OK; +} + + +/** + * TODO + */ +int srd_unload_all_decoders(void) +{ + GSList *l; + struct srd_decoder *dec; + + for (l = srd_list_decoders(); l; l = l->next) { + dec = l->data; + /* TODO: Error handling. */ + srd_unload_decoder(dec); + } + + return SRD_OK; +} + + + |