mar_extract.c

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <onlineupdate/mar_private.h>
#include <onlineupdate/mar.h>
 
#ifdef _WIN32
#include <io.h>
#include <direct.h>
#endif
 
/* Ensure that the directory containing this file exists */
static int mar_ensure_parent_dir(const char *path)
{
  char *slash = strrchr(path, '/');
  if (slash)
  {
    *slash = '\0';
    mar_ensure_parent_dir(path);
#ifdef _WIN32
    _mkdir(path);
#else
    mkdir(path, 0755);
#endif
    *slash = '/';
  }
  return 0;
}
 
static int mar_test_callback(MarFile *mar, const MarItem *item, void *unused) {
  FILE *fp;
  char buf[BLOCKSIZE];
  int fd, len, offset = 0;
 
  (void) unused; // avoid warnings
 
  if (mar_ensure_parent_dir(item->name))
    return -1;
 
#ifdef _WIN32
  fd = _open(item->name, _O_BINARY|_O_CREAT|_O_TRUNC|_O_WRONLY, item->flags);
#else
  fd = creat(item->name, item->flags);
#endif
  if (fd == -1) {
    fprintf(stderr, "ERROR: could not create file in mar_test_callback()\n");
    perror(item->name);
    return -1;
  }
 
  fp = fdopen(fd, "wb");
  if (!fp)
    return -1;
 
  while ((len = mar_read(mar, item, offset, buf, sizeof(buf))) > 0) {
    if (fwrite(buf, len, 1, fp) != 1)
      break;
    offset += len;
  }
 
  fclose(fp);
  return len == 0 ? 0 : -1;
}
 
int mar_extract(const char *path) {
  MarFile *mar;
  int rv;
 
  mar = mar_open(path);
  if (!mar)
    return -1;
 
  rv = mar_enum_items(mar, mar_test_callback, NULL);
 
  mar_close(mar);
  return rv;
}