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src/swap_utils.c

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+/*******************************************************************************
+ *   Ledger Ethereum App
+ *   (c) 2016-2019 Ledger
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  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.
+ ********************************************************************************/
+
+#include <stdint.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "tokens.h"
+#include "swap_utils.h"
+
+bool parse_swap_config(const uint8_t *config, uint8_t config_len, char *ticker, uint8_t *decimals) {
+    uint8_t ticker_len, offset = 0;
+    if (config_len == 0) {
+        return false;
+    }
+    ticker_len = config[offset++];
+    if (ticker_len == 0 || ticker_len > MAX_TICKER_LEN - 2 || config_len - offset < ticker_len) {
+        return false;
+    }
+    memcpy(ticker, config + offset, ticker_len);
+    offset += ticker_len;
+    ticker[ticker_len] = '\0';
+
+    if (config_len - offset < 1) {
+        return false;
+    }
+    *decimals = config[offset];
+    return true;
+}