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https://github.com/Next-Flip/Momentum-Firmware.git
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f8fa71c575
* additional checks to prevent false positives * Update trt.c Co-authored-by: あく <alleteam@gmail.com>
98 lines
3.7 KiB
C
98 lines
3.7 KiB
C
// Flipper Zero parser for for Tianjin Railway Transit (TRT)
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// https://en.wikipedia.org/wiki/Tianjin_Metro
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// Reverse engineering and parser development by @Torron (Github: @zinongli)
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#include "nfc_supported_card_plugin.h"
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#include <flipper_application.h>
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#include <nfc/protocols/mf_ultralight/mf_ultralight.h>
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#include <bit_lib.h>
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#define TAG "TrtParser"
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#define LATEST_SALE_MARKER 0x02
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#define FULL_SALE_TIME_STAMP_PAGE 0x09
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#define BALANCE_PAGE 0x08
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#define SALE_RECORD_TIME_STAMP_A 0x0C
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#define SALE_RECORD_TIME_STAMP_B 0x0E
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#define SALE_YEAR_OFFSET 2000
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static bool trt_parse(const NfcDevice* device, FuriString* parsed_data) {
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furi_assert(device);
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furi_assert(parsed_data);
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const MfUltralightData* data = nfc_device_get_data(device, NfcProtocolMfUltralight);
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bool parsed = false;
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do {
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uint8_t latest_sale_page = 0;
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// Look for sale record signature
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if(data->page[SALE_RECORD_TIME_STAMP_A].data[0] == LATEST_SALE_MARKER) {
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latest_sale_page = SALE_RECORD_TIME_STAMP_A;
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} else if(data->page[SALE_RECORD_TIME_STAMP_B].data[0] == LATEST_SALE_MARKER) {
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latest_sale_page = SALE_RECORD_TIME_STAMP_B;
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} else {
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break;
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}
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// Check if the sale record was backed up
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const uint8_t* partial_record_pointer = &data->page[latest_sale_page - 1].data[0];
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const uint8_t* full_record_pointer = &data->page[FULL_SALE_TIME_STAMP_PAGE].data[0];
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uint32_t latest_sale_record = bit_lib_get_bits_32(partial_record_pointer, 3, 20);
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uint32_t latest_sale_full_record = bit_lib_get_bits_32(full_record_pointer, 0, 27);
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if(latest_sale_record != (latest_sale_full_record & 0xFFFFF))
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break; // check if the copy matches
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if((latest_sale_record == 0) || (latest_sale_full_record == 0))
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break; // prevent false positive
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// Parse date
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// yyy yyyymmmm dddddhhh hhnnnnnn
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uint16_t sale_year = ((latest_sale_full_record & 0x7F00000) >> 20) + SALE_YEAR_OFFSET;
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uint8_t sale_month = (latest_sale_full_record & 0xF0000) >> 16;
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uint8_t sale_day = (latest_sale_full_record & 0xF800) >> 11;
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uint8_t sale_hour = (latest_sale_full_record & 0x7C0) >> 6;
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uint8_t sale_minute = latest_sale_full_record & 0x3F;
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// Parse balance
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uint16_t balance = bit_lib_get_bits_16(&data->page[BALANCE_PAGE].data[2], 0, 16);
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uint16_t balance_yuan = balance / 100;
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uint8_t balance_cent = balance % 100;
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// Format string for rendering
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furi_string_cat_printf(parsed_data, "\e#TRT Tianjin Metro\n");
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furi_string_cat_printf(parsed_data, "Single-Use Ticket\n");
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furi_string_cat_printf(parsed_data, "Balance: %u.%02u RMB\n", balance_yuan, balance_cent);
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furi_string_cat_printf(
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parsed_data,
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"Sale Date: \n%04u-%02d-%02d %02d:%02d",
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sale_year,
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sale_month,
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sale_day,
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sale_hour,
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sale_minute);
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parsed = true;
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} while(false);
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return parsed;
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}
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/* Actual implementation of app<>plugin interface */
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static const NfcSupportedCardsPlugin trt_plugin = {
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.protocol = NfcProtocolMfUltralight,
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.verify = NULL,
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.read = NULL,
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.parse = trt_parse,
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};
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/* Plugin descriptor to comply with basic plugin specification */
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static const FlipperAppPluginDescriptor trt_plugin_descriptor = {
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.appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
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.ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
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.entry_point = &trt_plugin,
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};
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/* Plugin entry point - must return a pointer to const descriptor */
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const FlipperAppPluginDescriptor* trt_plugin_ep(void) {
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return &trt_plugin_descriptor;
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}
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