componeent structure, preparation for component branch

components/ena-binary-export/CMakeLists.txt

@@ -0,0 +1,10 @@
+idf_component_register(
+    SRCS 
+        "ena-binary-export.c"
+    INCLUDE_DIRS "."
+    PRIV_REQUIRES
+        ena
+        nanopb
+    EMBED_FILES
+        "test/export.bin"
+)

components/ena-binary-export/ena-binary-export.c

@@ -0,0 +1,90 @@
+#include <string.h>
+#include <time.h>
+#include <limits.h>
+
+#include "esp_err.h"
+#include "esp_log.h"
+
+#include "ena-exposure.h"
+
+#include "pb_decode.h"
+#include "TemporaryExposureKeyExport.pb.h"
+
+static const char kFileHeader[] = "EK Export v1    ";
+static size_t kFileHeaderSize = sizeof(kFileHeader) - 1;
+
+bool ena_binary_export_decode_key_data(pb_istream_t *stream, const pb_field_t *field, void **arg)
+{
+    uint8_t *key_data = (uint8_t *)*arg;
+
+    if (!pb_read(stream, key_data, stream->bytes_left))
+    {
+        ESP_LOGW(ENA_EXPOSURE_LOG, "Decoding failed: %s\n", PB_GET_ERROR(stream));
+        return false;
+    }
+
+    return true;
+}
+
+bool ena_binary_export_decode_key(pb_istream_t *stream, const pb_field_t *field, void **arg)
+{
+    uint8_t key_data[ENA_KEY_LENGTH] = {0};
+    TemporaryExposureKey tek = TemporaryExposureKey_init_zero;
+
+    tek.key_data = (pb_callback_t){
+        .funcs.decode = ena_binary_export_decode_key_data,
+        .arg = &key_data,
+    };
+
+    if (!pb_decode(stream, TemporaryExposureKey_fields, &tek))
+    {
+        ESP_LOGW(ENA_EXPOSURE_LOG, "Decoding failed: %s\n", PB_GET_ERROR(stream));
+        return false;
+    }
+
+    ESP_LOGD(ENA_EXPOSURE_LOG,
+             "check reported tek: rolling_start_interval_number %d, rolling_period %d, days_since_last_exposure %d, report_type %d, transmission_risk_values %d",
+             tek.rolling_start_interval_number, tek.rolling_period, tek.days_since_onset_of_symptoms, tek.report_type, tek.transmission_risk_level);
+
+    ESP_LOG_BUFFER_HEXDUMP(ENA_EXPOSURE_LOG, &key_data, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
+
+    ena_temporary_exposure_key_t temporary_exposure_key = {
+        .transmission_risk_level = tek.transmission_risk_level,
+        .rolling_start_interval_number = tek.rolling_start_interval_number,
+        .rolling_period = tek.rolling_period,
+        .report_type = tek.report_type,
+        .days_since_onset_of_symptoms = tek.days_since_onset_of_symptoms,
+    };
+
+    memcpy(temporary_exposure_key.key_data, key_data, ENA_KEY_LENGTH);
+
+    ena_exposure_check_temporary_exposure_key(temporary_exposure_key);
+
+    return true;
+}
+
+esp_err_t ena_binary_export_check_export(uint8_t *buf, size_t size)
+{
+    // validate header
+    if (memcmp(kFileHeader, buf, kFileHeaderSize) != 0)
+    {
+        ESP_LOGW(ENA_EXPOSURE_LOG, "Wrong or missing header!");
+        return ESP_FAIL;
+    }
+
+    TemporaryExposureKeyExport tek_export = TemporaryExposureKeyExport_init_zero;
+
+    tek_export.keys = (pb_callback_t){
+        .funcs.decode = ena_binary_export_decode_key,
+    };
+
+    pb_istream_t stream = pb_istream_from_buffer(&buf[kFileHeaderSize], (size - kFileHeaderSize));
+
+    if (!pb_decode(&stream, TemporaryExposureKeyExport_fields, &tek_export))
+    {
+        ESP_LOGW(ENA_EXPOSURE_LOG, "Decoding failed: %s\n", PB_GET_ERROR(&stream));
+        return ESP_FAIL;
+    }
+
+    return ESP_OK;
+}

components/ena-binary-export/ena-binary-export.h

@@ -0,0 +1,37 @@
+// Copyright 2020 Lukas Haubaum
+//
+// Licensed under the GNU Affero General Public License, Version 3;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     https://www.gnu.org/licenses/agpl-3.0.html
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+/**
+ * @file
+ * 
+ * @brief decode Exposure Key export and run exposure check
+ * 
+ */
+#ifndef _ena_BINARY_H_
+#define _ena_BINARY_H_
+
+#include <stdio.h>
+#include "esp_err.h"
+
+/**
+ * @brief reads a Temporary Exposue Key Export binary and check for exposures
+ * 
+ * @param[in] buf the buffer containing the binary data
+ * @param[in] size the size of the buffer
+ * 
+ * @return 
+ *      esp_err_t status of reading binary
+ */
+esp_err_t ena_binary_export_check_export(uint8_t *buf, size_t size);
+
+#endif