contrib/libarchive/archive_read_open_file.c

   1 /*-
   2  * Copyright (c) 2003-2004 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_open_file.c,v 1.8 2005/03/13 01:51:16 kientzle Exp $");
  29
  30 #include <sys/stat.h>
  31 #include <errno.h>
  32 #include <fcntl.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37 #include "archive.h"
  38 #include "archive_private.h"
  39
  40 struct read_file_data {
  41         int      fd;
  42         size_t   block_size;
  43         void    *buffer;
  44         mode_t   st_mode;  /* Mode bits for opened file. */
  45         char     filename[1]; /* Must be last! */
  46 };
  47
  48 static int      file_close(struct archive *, void *);
  49 static int      file_open(struct archive *, void *);
  50 static ssize_t  file_read(struct archive *, void *, const void **buff);
  51
  52 int
  53 archive_read_open_file(struct archive *a, const char *filename,
  54     size_t block_size)
  55 {
  56         struct read_file_data *mine;
  57
  58         if (filename == NULL || filename[0] == '\0') {
  59                 mine = malloc(sizeof(*mine));
  60                 if (mine == NULL) {
  61                         archive_set_error(a, ENOMEM, "No memory");
  62                         return (ARCHIVE_FATAL);
  63                 }
  64                 mine->filename[0] = '\0';
  65         } else {
  66                 mine = malloc(sizeof(*mine) + strlen(filename));
  67                 if (mine == NULL) {
  68                         archive_set_error(a, ENOMEM, "No memory");
  69                         return (ARCHIVE_FATAL);
  70                 }
  71                 strcpy(mine->filename, filename);
  72         }
  73         mine->block_size = block_size;
  74         mine->buffer = NULL;
  75         mine->fd = -1;
  76         return (archive_read_open(a, mine, file_open, file_read, file_close));
  77 }
  78
  79 static int
  80 file_open(struct archive *a, void *client_data)
  81 {
  82         struct read_file_data *mine = client_data;
  83         struct stat st;
  84
  85         mine->buffer = malloc(mine->block_size);
  86         if (mine->filename[0] != '\0')
  87                 mine->fd = open(mine->filename, O_RDONLY);
  88         else
  89                 mine->fd = 0; /* Fake "open" for stdin. */
  90         if (mine->fd < 0) {
  91                 archive_set_error(a, errno, "Failed to open '%s'",
  92                     mine->filename);
  93                 return (ARCHIVE_FATAL);
  94         }
  95         if (fstat(mine->fd, &st) == 0) {
  96                 /* Set dev/ino of archive file so extract won't overwrite. */
  97                 a->skip_file_dev = st.st_dev;
  98                 a->skip_file_ino = st.st_ino;
  99                 /* Remember mode so close can decide whether to flush. */
 100                 mine->st_mode = st.st_mode;
 101         } else {
 102                 if (mine->filename[0] == '\0')
 103                         archive_set_error(a, errno, "Can't stat stdin");
 104                 else
 105                         archive_set_error(a, errno, "Can't stat '%s'",
 106                             mine->filename);
 107                 return (ARCHIVE_FATAL);
 108         }
 109         return (0);
 110 }
 111
 112 static ssize_t
 113 file_read(struct archive *a, void *client_data, const void **buff)
 114 {
 115         struct read_file_data *mine = client_data;
 116         ssize_t bytes_read;
 117
 118         (void)a; /* UNUSED */
 119         *buff = mine->buffer;
 120         bytes_read = read(mine->fd, mine->buffer, mine->block_size);
 121         if (bytes_read < 0) {
 122                 if (mine->filename[0] == '\0')
 123                         archive_set_error(a, errno, "Error reading stdin");
 124                 else
 125                         archive_set_error(a, errno, "Error reading '%s'",
 126                             mine->filename);
 127         }
 128         return (bytes_read);
 129 }
 130
 131 static int
 132 file_close(struct archive *a, void *client_data)
 133 {
 134         struct read_file_data *mine = client_data;
 135
 136         (void)a; /* UNUSED */
 137
 138         /*
 139          * Sometimes, we should flush the input before closing.
 140          *   Regular files: faster to just close without flush.
 141          *   Devices: must not flush (user might need to
 142          *      read the "next" item on a non-rewind device).
 143          *   Pipes and sockets:  must flush (otherwise, the
 144          *      program feeding the pipe or socket may complain).
 145          * Here, I flush everything except for regular files and
 146          * device nodes.
 147          */
 148         if (!S_ISREG(mine->st_mode)
 149             && !S_ISCHR(mine->st_mode)
 150             && !S_ISBLK(mine->st_mode)) {
 151                 ssize_t bytesRead;
 152                 do {
 153                         bytesRead = read(mine->fd, mine->buffer,
 154                             mine->block_size);
 155                 } while (bytesRead > 0);
 156         }
 157         /* If a named file was opened, then it needs to be closed. */
 158         if (mine->filename[0] != '\0')
 159                 close(mine->fd);
 160         if (mine->buffer != NULL)
 161                 free(mine->buffer);
 162         free(mine);
 163         return (ARCHIVE_OK);
 164 }