194 lines
7.3 KiB
C
194 lines
7.3 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, 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-internal.h
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* @brief Internal defines and macros
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*/
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#ifndef __NFC_INTERNAL_H__
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#define __NFC_INTERNAL_H__
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#include <stdbool.h>
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#include <err.h>
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#include "nfc/nfc.h"
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#include "log.h"
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/**
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* @macro HAL
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* @brief Execute corresponding driver function if exists.
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*/
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#define HAL( FUNCTION, ... ) pnd->last_error = 0; \
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if (pnd->driver->FUNCTION) { \
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return pnd->driver->FUNCTION( __VA_ARGS__ ); \
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} else { \
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pnd->last_error = NFC_EDEVNOTSUPP; \
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return false; \
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}
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/*
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* Buffer management macros.
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*
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* The following macros ease setting-up and using buffers:
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* BUFFER_INIT (data, 5); // data -> [ xx, xx, xx, xx, xx ]
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* BUFFER_SIZE (data); // size -> 0
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* BUFFER_APPEND (data, 0x12); // data -> [ 12, xx, xx, xx, xx ]
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* BUFFER_SIZE (data); // size -> 1
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* uint16_t x = 0x3456; // We suppose we are little endian
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* BUFFER_APPEND_BYTES (data, x, 2);
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* // data -> [ 12, 56, 34, xx, xx ]
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* BUFFER_SIZE (data); // size -> 3
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* BUFFER_APPEND_LE (data, x, 2, sizeof (x));
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* // data -> [ 12, 56, 34, 34, 56 ]
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* BUFFER_SIZE (data); // size -> 5
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*/
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/*
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* Initialise a buffer named buffer_name of size bytes.
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*/
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#define BUFFER_INIT(buffer_name, size) \
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uint8_t buffer_name[size]; \
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size_t __##buffer_name##_n = 0
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/*
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* Create a wrapper for an existing buffer.
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* BEWARE! It eats children!
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*/
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#define BUFFER_ALIAS(buffer_name, origin) \
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uint8_t *buffer_name = (void *)origin; \
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size_t __##buffer_name##_n = 0;
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#define BUFFER_SIZE(buffer_name) (__##buffer_name##_n)
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#define BUFFER_CLEAR(buffer_name) (__##buffer_name##_n = 0)
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/*
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* Append one byte of data to the buffer buffer_name.
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*/
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#define BUFFER_APPEND(buffer_name, data) \
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do { \
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buffer_name[__##buffer_name##_n++] = data; \
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} while (0)
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/*
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* Append size bytes of data to the buffer buffer_name.
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*/
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#define BUFFER_APPEND_BYTES(buffer_name, data, size) \
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do { \
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size_t __n = 0; \
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while (__n < size) { \
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buffer_name[__##buffer_name##_n++] = ((uint8_t *)data)[__n++]; \
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} \
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} while (0)
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/*
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* Append data_size bytes of data at the end of the buffer. Since data is
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* copied as a little endian value, the storage size of the value has to be
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* passed as the field_size parameter.
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*
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* Example: to copy 24 bits of data from a 32 bits value:
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* BUFFER_APPEND_LE (buffer, data, 3, 4);
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*/
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#if _BYTE_ORDER != _LITTLE_ENDIAN
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#define BUFFER_APPEND_LE(buffer, data, data_size, field_size) \
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do { \
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size_t __data_size = data_size; \
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size_t __field_size = field_size; \
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while (__field_size--, __data_size--) { \
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buffer[__##buffer##_n++] = ((uint8_t *)&data)[__field_size]; \
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} \
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} while (0)
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#else
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#define BUFFER_APPEND_LE(buffer, data, data_size, field_size) \
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do { \
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memcpy (buffer + __##buffer##_n, &data, data_size); \
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__##buffer##_n += data_size; \
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} while (0)
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#endif
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struct nfc_driver_t {
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const char *name;
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bool (*probe)(nfc_connstring connstrings[], size_t connstrings_len, size_t * pszDeviceFound);
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struct nfc_device *(*connect) (const nfc_connstring connstring);
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void (*disconnect) (struct nfc_device *pnd);
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const char *(*strerror) (const struct nfc_device *pnd);
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int (*initiator_init) (struct nfc_device *pnd);
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int (*initiator_select_passive_target) (struct nfc_device *pnd, const nfc_modulation nm, const uint8_t * pbtInitData, const size_t szInitData, nfc_target * pnt);
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int (*initiator_poll_target) (struct nfc_device *pnd, const nfc_modulation * pnmModulations, const size_t szModulations, const uint8_t uiPollNr, const uint8_t btPeriod, nfc_target * pnt);
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int (*initiator_select_dep_target) (struct nfc_device *pnd, const nfc_dep_mode ndm, const nfc_baud_rate nbr, const nfc_dep_info * pndiInitiator, nfc_target * pnt, const int timeout);
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int (*initiator_deselect_target) (struct nfc_device *pnd);
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int (*initiator_transceive_bytes) (struct nfc_device *pnd, const uint8_t * pbtTx, const size_t szTx, uint8_t * pbtRx, size_t * pszRx, int timeout);
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int (*initiator_transceive_bits) (struct nfc_device *pnd, const uint8_t * pbtTx, const size_t szTxBits, const uint8_t * pbtTxPar, uint8_t * pbtRx, uint8_t * pbtRxPar);
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int (*initiator_transceive_bytes_timed) (struct nfc_device *pnd, const uint8_t * pbtTx, const size_t szTx, uint8_t * pbtRx, uint32_t * cycles);
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int (*initiator_transceive_bits_timed) (struct nfc_device *pnd, const uint8_t * pbtTx, const size_t szTxBits, const uint8_t * pbtTxPar, uint8_t * pbtRx, uint8_t * pbtRxPar, uint32_t * cycles);
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int (*target_init) (struct nfc_device *pnd, nfc_target * pnt, uint8_t * pbtRx, size_t * pszRx);
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int (*target_send_bytes) (struct nfc_device *pnd, const uint8_t * pbtTx, const size_t szTx, int timeout);
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int (*target_receive_bytes) (struct nfc_device *pnd, uint8_t * pbtRx, size_t * pszRx, int timeout);
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int (*target_send_bits) (struct nfc_device *pnd, const uint8_t * pbtTx, const size_t szTxBits, const uint8_t * pbtTxPar);
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int (*target_receive_bits) (struct nfc_device *pnd, uint8_t * pbtRx, size_t * pszRxBits, uint8_t * pbtRxPar);
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int (*device_set_property_bool) (struct nfc_device *pnd, const nfc_property property, const bool bEnable);
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int (*device_set_property_int) (struct nfc_device *pnd, const nfc_property property, const int value);
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bool (*abort_command) (struct nfc_device *pnd);
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int (*idle) (struct nfc_device *pnd);
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};
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# define DEVICE_NAME_LENGTH 256
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# define DEVICE_PORT_LENGTH 64
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/**
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* @struct nfc_device
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* @brief NFC device information
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*/
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struct nfc_device {
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const struct nfc_driver_t *driver;
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void *driver_data;
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void *chip_data;
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/** Device name string, including device wrapper firmware */
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char acName[DEVICE_NAME_LENGTH];
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/** Is the CRC automaticly added, checked and removed from the frames */
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bool bCrc;
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/** Does the chip handle parity bits, all parities are handled as data */
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bool bPar;
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/** Should the chip handle frames encapsulation and chaining */
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bool bEasyFraming;
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/** Should the chip switch automatically activate ISO14443-4 when
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selecting tags supporting it? */
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bool bAutoIso14443_4;
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/** Supported modulation encoded in a byte */
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uint8_t btSupportByte;
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/** Last reported error */
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int last_error;
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};
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nfc_device *nfc_device_new (void);
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void nfc_device_free (nfc_device *dev);
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void iso14443_cascade_uid (const uint8_t abtUID[], const size_t szUID, uint8_t * pbtCascadedUID, size_t * pszCascadedUID);
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void prepare_initiator_data (const nfc_modulation nm, uint8_t **ppbtInitiatorData, size_t * pszInitiatorData);
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#endif // __NFC_INTERNAL_H__
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