70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*-
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* Public platform independent Near Field Communication (NFC) library
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*
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* Copyright (C) 2011 Romain Tartière
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* Copyright (C) 2011 Romuald Conty
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file nfc-emulation.c
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* @brief Provide a small API to ease emulation in libnfc
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*/
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#include <nfc/nfc.h>
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#include <nfc/nfc-emulation.h>
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#include "iso7816.h"
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/** @ingroup emulation
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* @brief Emulate a target
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* @return Returns 0 on success, otherwise returns libnfc's error code (negative value).
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*
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* @param pnd \a nfc_device struct pointer that represents currently used device
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* @param emulator \nfc_emulator struct point that handles input/output functions
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*
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* If timeout equals to 0, the function blocks indefinitely (until an error is raised or function is completed)
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* If timeout equals to -1, the default timeout will be used
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*/
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int
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nfc_emulate_target(nfc_device *pnd, struct nfc_emulator *emulator, const int timeout)
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{
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uint8_t abtRx[ISO7816_SHORT_R_APDU_MAX_LEN];
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uint8_t abtTx[ISO7816_SHORT_C_APDU_MAX_LEN];
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int res;
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if ((res = nfc_target_init(pnd, emulator->target, abtRx, sizeof(abtRx), timeout)) < 0) {
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return res;
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}
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size_t szRx = res;
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int io_res = res;
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while (io_res >= 0) {
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io_res = emulator->state_machine->io(emulator, abtRx, szRx, abtTx, sizeof(abtTx));
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if (io_res > 0) {
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if ((res = nfc_target_send_bytes(pnd, abtTx, io_res, timeout)) < 0) {
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return res;
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}
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}
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if (io_res >= 0) {
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if ((res = nfc_target_receive_bytes(pnd, abtRx, sizeof(abtRx), timeout)) < 0) {
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return res;
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}
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szRx = res;
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}
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}
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return (io_res < 0) ? io_res : 0;
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}
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