nfc_ndef.c

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#ifdef HAVE_NFC
#ifdef HAVE_NDEF_SUPPORT
#include "nfc_ndef.h"
#include "string.h"
#include "os_apdu.h"
 
/**********************
 *   GLOBAL FUNCTIONS
 **********************/
 
uint16_t os_get_uri_header(uint8_t uri_id, char *uri_header)
{
    switch (uri_id) {
        case URI_ID_0x01:
            strcpy(uri_header, URI_ID_0x01_STRING);
            break;
        case URI_ID_0x02:
            strcpy(uri_header, URI_ID_0x02_STRING);
            break;
        case URI_ID_0x03:
            strcpy(uri_header, URI_ID_0x03_STRING);
            break;
        case URI_ID_0x04:
            strcpy(uri_header, URI_ID_0x04_STRING);
            break;
        case URI_ID_0x05:
            strcpy(uri_header, URI_ID_0x05_STRING);
            break;
        case URI_ID_0x06:
            strcpy(uri_header, URI_ID_0x06_STRING);
            break;
        case URI_ID_0x07:
            strcpy(uri_header, URI_ID_0x07_STRING);
            break;
        case URI_ID_0x08:
            strcpy(uri_header, URI_ID_0x08_STRING);
            break;
        case URI_ID_0x09:
            strcpy(uri_header, URI_ID_0x09_STRING);
            break;
        case URI_ID_0x0A:
            strcpy(uri_header, URI_ID_0x0A_STRING);
            break;
        case URI_ID_0x0B:
            strcpy(uri_header, URI_ID_0x0B_STRING);
            break;
        case URI_ID_0x0C:
            strcpy(uri_header, URI_ID_0x0C_STRING);
            break;
        case URI_ID_0x0D:
            strcpy(uri_header, URI_ID_0x0D_STRING);
            break;
        case URI_ID_0x0E:
            strcpy(uri_header, URI_ID_0x0E_STRING);
            break;
        case URI_ID_0x0F:
            strcpy(uri_header, URI_ID_0x0F_STRING);
            break;
        case URI_ID_0x10:
            strcpy(uri_header, URI_ID_0x10_STRING);
            break;
        case URI_ID_0x11:
            strcpy(uri_header, URI_ID_0x11_STRING);
            break;
        case URI_ID_0x12:
            strcpy(uri_header, URI_ID_0x12_STRING);
            break;
        case URI_ID_0x13:
            strcpy(uri_header, URI_ID_0x13_STRING);
            break;
        case URI_ID_0x14:
            strcpy(uri_header, URI_ID_0x14_STRING);
            break;
        case URI_ID_0x15:
            strcpy(uri_header, URI_ID_0x15_STRING);
            break;
        case URI_ID_0x16:
            strcpy(uri_header, URI_ID_0x16_STRING);
            break;
        case URI_ID_0x17:
            strcpy(uri_header, URI_ID_0x17_STRING);
            break;
        case URI_ID_0x18:
            strcpy(uri_header, URI_ID_0x18_STRING);
            break;
        case URI_ID_0x19:
            strcpy(uri_header, URI_ID_0x19_STRING);
            break;
        case URI_ID_0x1A:
            strcpy(uri_header, URI_ID_0x1A_STRING);
            break;
        case URI_ID_0x1B:
            strcpy(uri_header, URI_ID_0x1B_STRING);
            break;
        case URI_ID_0x1C:
            strcpy(uri_header, URI_ID_0x1C_STRING);
            break;
        case URI_ID_0x1D:
            strcpy(uri_header, URI_ID_0x1D_STRING);
            break;
        case URI_ID_0x1E:
            strcpy(uri_header, URI_ID_0x1E_STRING);
            break;
        case URI_ID_0x1F:
            strcpy(uri_header, URI_ID_0x1F_STRING);
            break;
        case URI_ID_0x20:
            strcpy(uri_header, URI_ID_0x20_STRING);
            break;
        case URI_ID_0x21:
            strcpy(uri_header, URI_ID_0x21_STRING);
            break;
        case URI_ID_0x22:
            strcpy(uri_header, URI_ID_0x22_STRING);
            break;
        case URI_ID_0x23:
            strcpy(uri_header, URI_ID_0x23_STRING);
            break;
        default:
            return 0;
            break;
    }
    return strlen(uri_header);
}
 
uint8_t os_parse_ndef(uint8_t *in_buffer, ndef_struct_t *parsed)
{
    uint8_t text_length, info_length;
    parsed->ndef_type = in_buffer[APDU_OFF_P1];
    parsed->uri_id    = in_buffer[APDU_OFF_P2];
    text_length       = in_buffer[APDU_OFF_DATA];
    if (text_length > NFC_TEXT_MAX_LEN) {
        return 1;
    }
    memcpy(parsed->text, &in_buffer[APDU_OFF_DATA + 1], text_length);
    parsed->text[text_length] = '\0';
    info_length               = in_buffer[APDU_OFF_DATA + 1 + text_length];
    if (info_length > NFC_INFO_MAX_LEN) {
        return 1;
    }
    if (info_length) {
        memcpy(parsed->info, &in_buffer[APDU_OFF_DATA + 1 + text_length + 1], info_length);
        parsed->info[info_length] = '\0';
    }
    return 0;
}
 
uint16_t os_ndef_to_string(ndef_struct_t *ndef_message, char *out_string)
{
    uint16_t tot_length      = 0;
    uint16_t length_internal = 0;
    if (ndef_message->ndef_type == NFC_NDEF_TYPE_TEXT) {
        tot_length += strlen(ndef_message->text);
        if (tot_length > NFC_TEXT_MAX_LEN) {
            return 0;
        }
        strcpy(out_string, ndef_message->text);
    }
    else if (ndef_message->ndef_type == NFC_NDEF_TYPE_URI) {
        tot_length += os_get_uri_header(ndef_message->uri_id, out_string);
        length_internal = strlen(ndef_message->text);
        if (tot_length + length_internal > URI_ID_STRING_MAX_LEN + NFC_TEXT_MAX_LEN) {
            return 0;
        }
        strcpy(&out_string[tot_length], ndef_message->text);
        tot_length += length_internal;
        if (ndef_message->info[0] != '\0') {
            out_string[tot_length++] = '\n';
            length_internal          = strlen(ndef_message->info);
            if (tot_length + length_internal > NFC_NDEF_MAX_SIZE) {
                return 0;
            }
            strcpy(&out_string[tot_length], ndef_message->info);
            tot_length += length_internal;
        }
    }
    return tot_length;
}
#endif  // HAVE_NDEF_SUPPORT
#endif  // HAVE_NFC