/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/*****************************************************************************
 * $Id$
 *
 ****************************************************************************/

/** @file
 * Brief description of the file contents
 *
 * More detailed description
 */

#include <iostream>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "calpontsystemcatalog.h"

using namespace std;

void usage(char* name)
{
  cerr << "Usage: " << name << " dict_block_filename" << endl;
  exit(0);
}

void parseDictBlock(char* block)
{
  uint16_t* offsets;
  uint16_t* freeBytes;
  u_int64_t* contPtr;
  int offsetIndex, size;
  char sig[BLOCK_SIZE + 1];

  freeBytes = reinterpret_cast<uint16_t*>(&block[0]);
  contPtr = reinterpret_cast<u_int64_t*>(&block[2]);
  offsets = reinterpret_cast<uint16_t*>(&block[10]);

  cout << "Free Bytes: " << *freeBytes << endl;
  cout << "Continuation Pointer: 0x" << hex << *contPtr << dec << endl;

  for (offsetIndex = 0; offsets[offsetIndex + 1] != 0xffff; offsetIndex++)
  {
    size = offsets[offsetIndex] - offsets[offsetIndex + 1];
    memcpy(sig, &block[offsets[offsetIndex + 1]], size);
    sig[size] = '\0';
    cout << "Offset #" << offsetIndex + 1 << ": size=" << size << " offset=" << offsets[offsetIndex + 1]
         << endl;

    // Use these lines instead for non-ascii data.
    // 		cout << "   Signature: 0x";
    // 		for (i = 0; i < size; i++)
    // 			cout << hex << (((int) sig[i]) & 0xff);
    cout << "   Signature: " << sig;
    cout << dec << endl;
  }
}

int main(int argc, char** argv)
{
  int fd, err;
  char buf[BLOCK_SIZE];

  if (argc != 2)
    usage(argv[0]);

  fd = open(argv[1], O_RDONLY);

  if (fd < 0)
  {
    perror("open");
    exit(1);
  }

  err = read(fd, buf, BLOCK_SIZE);

  if (err < 0)
  {
    perror("read");
    exit(1);
  }

  if (err != BLOCK_SIZE)
  {
    cerr << "Failed to read the file in one op, check the filelength and try again." << endl;
    exit(1);
  }

  parseDictBlock(buf);
  exit(0);
}