diff options
Diffstat (limited to 'lib/libarchive/archive_read_open_fd.c')
| -rw-r--r-- | lib/libarchive/archive_read_open_fd.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/lib/libarchive/archive_read_open_fd.c b/lib/libarchive/archive_read_open_fd.c new file mode 100644 index 0000000..490b00b --- /dev/null +++ b/lib/libarchive/archive_read_open_fd.c @@ -0,0 +1,165 @@ +/*- + * Copyright (c) 2003-2007 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. + * 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("$FreeBSD$"); + +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif +#ifdef HAVE_STRING_H +#include <string.h> +#endif +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include "archive.h" + +struct read_fd_data { + int fd; + size_t block_size; + void *buffer; +}; + +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); +#if ARCHIVE_API_VERSION < 2 +static ssize_t file_skip(struct archive *, void *, size_t request); +#else +static off_t file_skip(struct archive *, void *, off_t request); +#endif + +int +archive_read_open_fd(struct archive *a, int fd, size_t block_size) +{ + struct read_fd_data *mine; + + mine = (struct read_fd_data *)malloc(sizeof(*mine)); + if (mine == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + return (ARCHIVE_FATAL); + } + mine->block_size = block_size; + mine->buffer = malloc(mine->block_size); + if (mine->buffer == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + free(mine); + return (ARCHIVE_FATAL); + } + mine->fd = fd; + return (archive_read_open2(a, mine, file_open, file_read, file_skip, file_close)); +} + +static int +file_open(struct archive *a, void *client_data) +{ + struct read_fd_data *mine = (struct read_fd_data *)client_data; + struct stat st; + + if (fstat(mine->fd, &st) != 0) { + archive_set_error(a, errno, "Can't stat fd %d", mine->fd); + return (ARCHIVE_FATAL); + } + + if (S_ISREG(st.st_mode)) + archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); + return (ARCHIVE_OK); +} + +static ssize_t +file_read(struct archive *a, void *client_data, const void **buff) +{ + struct read_fd_data *mine = (struct read_fd_data *)client_data; + ssize_t bytes_read; + + *buff = mine->buffer; + bytes_read = read(mine->fd, mine->buffer, mine->block_size); + if (bytes_read < 0) { + archive_set_error(a, errno, "Error reading fd %d", mine->fd); + } + return (bytes_read); +} + +#if ARCHIVE_API_VERSION < 2 +static ssize_t +file_skip(struct archive *a, void *client_data, size_t request) +#else +static off_t +file_skip(struct archive *a, void *client_data, off_t request) +#endif +{ + struct read_fd_data *mine = (struct read_fd_data *)client_data; + off_t old_offset, new_offset; + + /* Reduce request to the next smallest multiple of block_size */ + request = (request / mine->block_size) * mine->block_size; + /* + * Hurray for lazy evaluation: if the first lseek fails, the second + * one will not be executed. + */ + if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) < 0) || + ((new_offset = lseek(mine->fd, request, SEEK_CUR)) < 0)) + { + if (errno == ESPIPE) + { + /* + * Failure to lseek() can be caused by the file + * descriptor pointing to a pipe, socket or FIFO. + * Return 0 here, so the compression layer will use + * read()s instead to advance the file descriptor. + * It's slower of course, but works as well. + */ + return (0); + } + /* + * There's been an error other than ESPIPE. This is most + * likely caused by a programmer error (too large request) + * or a corrupted archive file. + */ + archive_set_error(a, errno, "Error seeking"); + return (-1); + } + return (new_offset - old_offset); +} + +static int +file_close(struct archive *a, void *client_data) +{ + struct read_fd_data *mine = (struct read_fd_data *)client_data; + + (void)a; /* UNUSED */ + if (mine->buffer != NULL) + free(mine->buffer); + free(mine); + return (ARCHIVE_OK); +} |
