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main.c

/*
 * main.c
 *
 * Copyright (c) 2001-2002  Ben Fennema <bfennema@falcon.csc.calpoly.edu>
 * All rights reserved.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include <limits.h>

#include "mkudffs.h"
#include "defaults.h"
#include "config.h"
#include "options.h"

static int64_t udf_lseek64(int fd, int64_t offset, int whence)
{
#if defined(HAVE_LSEEK64)
      return lseek64(fd, offset, whence);
#elif defined(HAVE_LLSEEK)
      return llseek(fd, offset, whence);
#else
      return lseek(fd, offset, whence);
#endif
}

static int valid_offset(int fd, int64_t offset)
{
      char ch;

      if (udf_lseek64(fd, offset, SEEK_SET) < 0)
            return 0;
      if (read(fd, &ch, 1) < 1)
            return 0;
      return 1;
}

int get_blocks(int fd, int blocksize, int opt_blocks)
{
      int blocks;
#ifdef BLKGETSIZE
      long size;
#endif
#ifdef FDGETPRM
      struct floppy_struct this_floppy;
#endif

#ifdef BLKGETSIZE
      if (ioctl(fd, BLKGETSIZE, &size) >= 0)
            blocks = size / (blocksize / 512);
      else
#endif
#ifdef FDGETPRM
      if (ioctl(fd, FDGETPRM, &this_floppy) >= 0)
            blocks = this_floppy.size / (blocksize / 512);
      else
#endif
      {
            int64_t high, low;

            for (low=0, high = 1024; valid_offset(fd, high); high *= 2)
                  low = high;
            while (low < high - 1)
            {
                  const int64_t mid = (low + high) / 2;

                  if (valid_offset(fd, mid))
                        low = mid;
                  else
                        high = mid;
            }

            valid_offset(fd, 0);
            blocks = (low + 1) / blocksize;
      }

      if (opt_blocks)
            blocks = opt_blocks;
      return blocks;
}

int write_func(struct udf_disc *disc, struct udf_extent *ext)
{
      static char *buffer = NULL;
      static int bufferlen = 0, length, offset;
      int fd = *(int *)disc->write_data;
      int ret;
      struct udf_desc *desc;
      struct udf_data *data;

      if (buffer == NULL)
      {
            bufferlen = disc->blocksize;
            buffer = calloc(bufferlen, 1);
      }

      if (!(ext->space_type & (USPACE|RESERVED)))
      {
            desc = ext->head;
            while (desc != NULL)
            {
                  ret = udf_lseek64(fd, (uint64_t)(ext->start + desc->offset) << disc->blocksize_bits, SEEK_SET);
                  data = desc->data;
                  offset = 0;
                  while (data != NULL)
                  {
                        if (data->length + offset > bufferlen)
                        {
                              bufferlen = (data->length + offset + disc->blocksize - 1) & ~(disc->blocksize - 1);
                              buffer = realloc(buffer, bufferlen);
                        }
                        memcpy(buffer + offset, data->buffer, data->length);
                        offset += data->length;
                        data = data->next;
                  }
                  length = (offset + disc->blocksize - 1) & ~(disc->blocksize - 1);
                  if (offset != length)
                        memset(buffer + offset, 0x00, length - offset);
                  if (write(fd, buffer, length) != length)
                        return -1;
                  desc = desc->next;
            }
      }
      return 0;
}
      
int main(int argc, char *argv[])
{
      struct udf_disc   disc;
      char filename[NAME_MAX];
      int fd;

      memset(&disc, 0x00, sizeof(disc));
      udf_init_disc(&disc);
      parse_args(argc, argv, &disc, filename);
#ifdef HAVE_OPEN64
      fd = open64(filename, O_RDWR | O_CREAT, 0660);
#else
      fd = open(filename, O_RDWR | O_CREAT | O_LARGEFILE, 0660);
#endif
      disc.head->blocks = get_blocks(fd, disc.blocksize, disc.head->blocks);
      disc.write = write_func;
      disc.write_data = &fd;

      split_space(&disc);

      setup_vrs(&disc);
      setup_anchor(&disc);
      setup_partition(&disc);
      setup_vds(&disc);

      dump_space(&disc);

      if (write_disc(&disc) < 0)
            return -1;
      else
            return 0;
}

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