YACWC

2026-08-31 22:43:51 -04:00
commit c87308caca
521 changed files with 141326 additions and 0 deletions
@@ -0,0 +1,76 @@
+
+
+#include "ndef.h"
+ndef_message readNDEFText(unsigned char *buf) {
+    int addr = 0;
+    NDEF_MSG.success = 0;
+
+    if (buf[0] != NDEF_TLV) {
+        NDEF_MSG.success = 1;
+        return NDEF_MSG;
+    }
+
+    if (buf[1] == 0xFF) {
+        NDEF_MSG.success = 2;
+        return NDEF_MSG;
+    };
+
+    // int len_field = buf[1];
+    addr = 2;
+
+    // bool is_short_record = (buf[addr] & NDEF_SHORT_RECORD) == NDEF_SHORT_RECORD;
+    bool has_id_length = (buf[addr] & NDEF_ID_LEN) == NDEF_ID_LEN;
+    uint8_t tnf = buf[addr] & 0x7;
+    addr += 1; // 3
+
+    uint8_t type_length = buf[addr];
+    addr += 1; // 4
+
+    uint8_t payload_length = buf[addr];
+    addr += 1; // 5
+
+    uint8_t id_length = 0;
+    if (has_id_length) {
+        id_length = buf[addr];
+        addr += 1;
+    }
+
+    uint8_t type_value[type_length + 1];
+    for (uint8_t i = 0; i < type_length; i++) {
+        type_value[i] = buf[addr];
+        addr += 1; // 6
+    }
+
+    type_value[type_length] = 0;
+    if (type_value[0] != NDEF_TEXT_RECORD) {
+        NDEF_MSG.success = 11;
+        return NDEF_MSG;
+    };
+    if (tnf != TNF_KNOWN) {
+        NDEF_MSG.success = 12;
+        return NDEF_MSG;
+    };
+
+    if (has_id_length && (id_length > 0)) {
+        addr += id_length;
+    }
+
+    uint8_t lang_str_len = buf[addr];
+    addr += lang_str_len;
+    addr += 1;
+    payload_length -= lang_str_len;     // Language string
+    payload_length -= 1;                //  The byte that says how long the language string is
+    for (uint8_t i = 0; i < (payload_length); i++) {
+        NDEF_MSG.payload[i] = buf[addr];
+        addr += 1;
+    }
+
+    // NDEF_MSG.payload = payload;
+    NDEF_MSG.payload_len = payload_length;
+    #if DO_UART
+    uart_sendString(NDEF_MSG.payload);
+    uart_sendString("\n");
+    #endif
+
+    return NDEF_MSG;
+};