/******************************************************************************
 *
 *  Copyright (C) 2011-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/
#include "_OverrideLog.h"

#include <fcntl.h>
#include "CrcChecksum.h"
#include "nfa_nv_ci.h"
#include "nfc_hal_nv_co.h"

extern char bcm_nfc_location[];
static const char* sNfaStorageBin = "/nfaStorage.bin";

/*******************************************************************************
**
** Function         nfa_mem_co_alloc
**
** Description      allocate a buffer from platform's memory pool
**
** Returns:
**                  pointer to buffer if successful
**                  NULL otherwise
**
*******************************************************************************/
extern void* nfa_mem_co_alloc(uint32_t num_bytes) { return malloc(num_bytes); }

/*******************************************************************************
**
** Function         nfa_mem_co_free
**
** Description      free buffer previously allocated using nfa_mem_co_alloc
**
** Returns:
**                  Nothing
**
*******************************************************************************/
extern void nfa_mem_co_free(void* pBuffer) { free(pBuffer); }

/*******************************************************************************
**
** Function         nfa_nv_co_read
**
** Description      This function is called by NFA to read in data from the
**                  previously opened file.
**
** Parameters       pBuffer   - buffer to read the data into.
**                  nbytes  - number of bytes to read into the buffer.
**
** Returns          void
**
**                  Note: Upon completion of the request, nfa_nv_ci_read() is
**                        called with the buffer of data, along with the number
**                        of bytes read into the buffer, and a status.  The
**                        call-in function should only be called when ALL
**                        requested bytes have been read, the end of file has
**                        been detected, or an error has occurred.
**
*******************************************************************************/
extern void nfa_nv_co_read(uint8_t* pBuffer, uint16_t nbytes, uint8_t block) {
  char filename[256], filename2[256];

  memset(filename, 0, sizeof(filename));
  memset(filename2, 0, sizeof(filename2));
  strcpy(filename2, bcm_nfc_location);
  strncat(filename2, sNfaStorageBin, sizeof(filename2) - strlen(filename2) - 1);
  if (strlen(filename2) > 200) {
    LOG(ERROR) << StringPrintf("%s: filename too long", __func__);
    return;
  }
  sprintf(filename, "%s%u", filename2, block);

  DLOG_IF(INFO, nfc_debug_enabled)
      << StringPrintf("%s: buffer len=%u; file=%s", __func__, nbytes, filename);
  int fileStream = open(filename, O_RDONLY);
  if (fileStream >= 0) {
    unsigned short checksum = 0;
    size_t actualReadCrc = read(fileStream, &checksum, sizeof(checksum));
    size_t actualReadData = read(fileStream, pBuffer, nbytes);
    close(fileStream);
    if (actualReadData > 0) {
      DLOG_IF(INFO, nfc_debug_enabled)
          << StringPrintf("%s: data size=%zu", __func__, actualReadData);
      nfa_nv_ci_read(actualReadData, NFA_NV_CO_OK, block);
    } else {
      LOG(ERROR) << StringPrintf("%s: fail to read", __func__);
      nfa_nv_ci_read(0, NFA_NV_CO_FAIL, block);
    }
  } else {
    DLOG_IF(INFO, nfc_debug_enabled)
        << StringPrintf("%s: fail to open", __func__);
    nfa_nv_ci_read(0, NFA_NV_CO_FAIL, block);
  }
}

/*******************************************************************************
**
** Function         nfa_nv_co_write
**
** Description      This function is called by io to send file data to the
**                  phone.
**
** Parameters       pBuffer   - buffer to read the data from.
**                  nbytes  - number of bytes to write out to the file.
**
** Returns          void
**
**                  Note: Upon completion of the request, nfa_nv_ci_write() is
**                        called with the file descriptor and the status.  The
**                        call-in function should only be called when ALL
**                        requested bytes have been written, or an error has
**                        been detected,
**
*******************************************************************************/
extern void nfa_nv_co_write(const uint8_t* pBuffer, uint16_t nbytes,
                            uint8_t block) {
  char filename[256], filename2[256];

  memset(filename, 0, sizeof(filename));
  memset(filename2, 0, sizeof(filename2));
  strcpy(filename2, bcm_nfc_location);
  strncat(filename2, sNfaStorageBin, sizeof(filename2) - strlen(filename2) - 1);
  if (strlen(filename2) > 200) {
    LOG(ERROR) << StringPrintf("%s: filename too long", __func__);
    return;
  }
  sprintf(filename, "%s%u", filename2, block);
  DLOG_IF(INFO, nfc_debug_enabled)
      << StringPrintf("%s: bytes=%u; file=%s", __func__, nbytes, filename);

  int fileStream = 0;

  fileStream = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
  if (fileStream >= 0) {
    unsigned short checksum = crcChecksumCompute(pBuffer, nbytes);
    size_t actualWrittenCrc = write(fileStream, &checksum, sizeof(checksum));
    size_t actualWrittenData = write(fileStream, pBuffer, nbytes);
    DLOG_IF(INFO, nfc_debug_enabled)
        << StringPrintf("%s: %zu bytes written", __func__, actualWrittenData);
    if ((actualWrittenData == nbytes) &&
        (actualWrittenCrc == sizeof(checksum))) {
      nfa_nv_ci_write(NFA_NV_CO_OK);
    } else {
      LOG(ERROR) << StringPrintf("%s: fail to write", __func__);
      nfa_nv_ci_write(NFA_NV_CO_FAIL);
    }
    close(fileStream);
  } else {
    LOG(ERROR) << StringPrintf("%s: fail to open, error = %d", __func__, errno);
    nfa_nv_ci_write(NFA_NV_CO_FAIL);
  }
}

/*******************************************************************************
**
** Function         delete_stack_non_volatile_store
**
** Description      Delete all the content of the stack's storage location.
**
** Parameters       forceDelete: unconditionally delete the storage.
**
** Returns          none
**
*******************************************************************************/
void delete_stack_non_volatile_store(bool forceDelete) {
  static bool firstTime = true;
  char filename[256], filename2[256];

  if ((firstTime == false) && (forceDelete == false)) return;
  firstTime = false;

  DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s", __func__);

  memset(filename, 0, sizeof(filename));
  memset(filename2, 0, sizeof(filename2));
  strcpy(filename2, bcm_nfc_location);
  strncat(filename2, sNfaStorageBin, sizeof(filename2) - strlen(filename2) - 1);
  if (strlen(filename2) > 200) {
    LOG(ERROR) << StringPrintf("%s: filename too long", __func__);
    return;
  }
  sprintf(filename, "%s%u", filename2, DH_NV_BLOCK);
  remove(filename);
  sprintf(filename, "%s%u", filename2, HC_F3_NV_BLOCK);
  remove(filename);
  sprintf(filename, "%s%u", filename2, HC_F4_NV_BLOCK);
  remove(filename);
  sprintf(filename, "%s%u", filename2, HC_F2_NV_BLOCK);
  remove(filename);
  sprintf(filename, "%s%u", filename2, HC_F5_NV_BLOCK);
  remove(filename);
}

/*******************************************************************************
**
** Function         verify_stack_non_volatile_store
**
** Description      Verify the content of all non-volatile store.
**
** Parameters       none
**
** Returns          none
**
*******************************************************************************/
void verify_stack_non_volatile_store() {
  DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s", __func__);
  char filename[256], filename2[256];
  bool isValid = false;

  memset(filename, 0, sizeof(filename));
  memset(filename2, 0, sizeof(filename2));
  strcpy(filename2, bcm_nfc_location);
  strncat(filename2, sNfaStorageBin, sizeof(filename2) - strlen(filename2) - 1);
  if (strlen(filename2) > 200) {
    LOG(ERROR) << StringPrintf("%s: filename too long", __func__);
    return;
  }

  sprintf(filename, "%s%u", filename2, DH_NV_BLOCK);
  if (crcChecksumVerifyIntegrity(filename)) {
    sprintf(filename, "%s%u", filename2, HC_F3_NV_BLOCK);
    if (crcChecksumVerifyIntegrity(filename)) {
      sprintf(filename, "%s%u", filename2, HC_F4_NV_BLOCK);
      if (crcChecksumVerifyIntegrity(filename)) {
        sprintf(filename, "%s%u", filename2, HC_F2_NV_BLOCK);
        if (crcChecksumVerifyIntegrity(filename)) {
          sprintf(filename, "%s%u", filename2, HC_F5_NV_BLOCK);
          if (crcChecksumVerifyIntegrity(filename)) isValid = true;
        }
      }
    }
  }

  if (isValid == false) delete_stack_non_volatile_store(true);
}