diff options
Diffstat (limited to 'lib/libarchive/archive_read_open_filename.c')
| -rw-r--r-- | lib/libarchive/archive_read_open_filename.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/lib/libarchive/archive_read_open_filename.c b/lib/libarchive/archive_read_open_filename.c new file mode 100644 index 0000000..b0db61c --- /dev/null +++ b/lib/libarchive/archive_read_open_filename.c @@ -0,0 +1,168 @@ +/*- + * Copyright (c) 2003-2004 Tim Kientzle + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer + * in this position and unchanged. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "archive_platform.h" +__FBSDID("$FreeBSD$"); + +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "archive.h" +#include "archive_private.h" + +struct read_file_data { + int fd; + size_t block_size; + void *buffer; + mode_t st_mode; /* Mode bits for opened file. */ + char filename[1]; /* Must be last! */ +}; + +static int file_close(struct archive *, void *); +static int file_open(struct archive *, void *); +static ssize_t file_read(struct archive *, void *, const void **buff); + +int +archive_read_open_file(struct archive *a, const char *filename, + size_t block_size) +{ + struct read_file_data *mine; + + if (filename == NULL || filename[0] == '\0') { + mine = malloc(sizeof(*mine)); + if (mine == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + return (ARCHIVE_FATAL); + } + mine->filename[0] = '\0'; + } else { + mine = malloc(sizeof(*mine) + strlen(filename)); + if (mine == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + return (ARCHIVE_FATAL); + } + strcpy(mine->filename, filename); + } + mine->block_size = block_size; + mine->buffer = NULL; + mine->fd = -1; + return (archive_read_open(a, mine, file_open, file_read, file_close)); +} + +static int +file_open(struct archive *a, void *client_data) +{ + struct read_file_data *mine = client_data; + struct stat st; + + mine->buffer = malloc(mine->block_size); + if (mine->buffer == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + return (ARCHIVE_FATAL); + } + if (mine->filename[0] != '\0') + mine->fd = open(mine->filename, O_RDONLY); + else + mine->fd = 0; /* Fake "open" for stdin. */ + if (mine->fd < 0) { + archive_set_error(a, errno, "Failed to open '%s'", + mine->filename); + return (ARCHIVE_FATAL); + } + if (fstat(mine->fd, &st) == 0) { + /* Set dev/ino of archive file so extract won't overwrite. */ + a->skip_file_dev = st.st_dev; + a->skip_file_ino = st.st_ino; + /* Remember mode so close can decide whether to flush. */ + mine->st_mode = st.st_mode; + } else { + if (mine->filename[0] == '\0') + archive_set_error(a, errno, "Can't stat stdin"); + else + archive_set_error(a, errno, "Can't stat '%s'", + mine->filename); + return (ARCHIVE_FATAL); + } + return (0); +} + +static ssize_t +file_read(struct archive *a, void *client_data, const void **buff) +{ + struct read_file_data *mine = client_data; + ssize_t bytes_read; + + (void)a; /* UNUSED */ + *buff = mine->buffer; + bytes_read = read(mine->fd, mine->buffer, mine->block_size); + if (bytes_read < 0) { + if (mine->filename[0] == '\0') + archive_set_error(a, errno, "Error reading stdin"); + else + archive_set_error(a, errno, "Error reading '%s'", + mine->filename); + } + return (bytes_read); +} + +static int +file_close(struct archive *a, void *client_data) +{ + struct read_file_data *mine = client_data; + + (void)a; /* UNUSED */ + + /* + * Sometimes, we should flush the input before closing. + * Regular files: faster to just close without flush. + * Devices: must not flush (user might need to + * read the "next" item on a non-rewind device). + * Pipes and sockets: must flush (otherwise, the + * program feeding the pipe or socket may complain). + * Here, I flush everything except for regular files and + * device nodes. + */ + if (!S_ISREG(mine->st_mode) + && !S_ISCHR(mine->st_mode) + && !S_ISBLK(mine->st_mode)) { + ssize_t bytesRead; + do { + bytesRead = read(mine->fd, mine->buffer, + mine->block_size); + } while (bytesRead > 0); + } + /* If a named file was opened, then it needs to be closed. */ + if (mine->filename[0] != '\0') + close(mine->fd); + if (mine->buffer != NULL) + free(mine->buffer); + free(mine); + return (ARCHIVE_OK); +} |
