59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*******************************************************************************
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* Ledger Ethereum App
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* (c) 2016-2019 Ledger
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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********************************************************************************/
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include "asset_info.h"
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#include "swap_utils.h"
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bool parse_swap_config(const uint8_t *config,
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uint8_t config_len,
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char *ticker,
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uint8_t *decimals,
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uint64_t *chain_id) {
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uint8_t ticker_len, offset = 0;
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if (config_len == 0) {
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return false;
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}
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ticker_len = config[offset];
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offset += sizeof(ticker_len);
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if ((ticker_len == 0) || (ticker_len > (MAX_TICKER_LEN - 2)) ||
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((config_len - offset) < (ticker_len))) {
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return false;
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}
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memcpy(ticker, config + offset, ticker_len);
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offset += ticker_len;
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ticker[ticker_len] = '\0';
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if ((config_len - offset) < 1) {
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return false;
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}
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*decimals = config[offset];
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offset += sizeof(*decimals);
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// the chain ID was adder later to the CAL swap subconfig
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// so it is optional for retro-compatibility (as it might not be present)
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if ((config_len - offset) >= sizeof(*chain_id)) {
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PRINTF("Chain ID from the swap subconfig = 0x%.*h\n", sizeof(*chain_id), &config[offset]);
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*chain_id = u64_from_BE(config + offset, sizeof(*chain_id));
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}
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return true;
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}
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