diff options
Diffstat (limited to 'Utilities/cmlibarchive/libarchive/archive_read_open_file.c')
| -rw-r--r-- | Utilities/cmlibarchive/libarchive/archive_read_open_file.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/Utilities/cmlibarchive/libarchive/archive_read_open_file.c b/Utilities/cmlibarchive/libarchive/archive_read_open_file.c new file mode 100644 index 0000000..a6d87b4 --- /dev/null +++ b/Utilities/cmlibarchive/libarchive/archive_read_open_file.c @@ -0,0 +1,167 @@ +/*- + * 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: src/lib/libarchive/archive_read_open_file.c,v 1.20 2007/06/26 03:06:48 kientzle Exp $"); + +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#ifdef HAVE_FCNTL_H +#include <fcntl.h> +#endif +#ifdef HAVE_IO_H +#include <io.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_FILE_data { + FILE *f; + size_t block_size; + void *buffer; + char can_skip; +}; + +static int file_close(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_FILE(struct archive *a, FILE *f) +{ + struct stat st; + struct read_FILE_data *mine; + size_t block_size = 128 * 1024; + void *b; + + archive_clear_error(a); + mine = (struct read_FILE_data *)malloc(sizeof(*mine)); + b = malloc(block_size); + if (mine == NULL || b == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + free(mine); + free(b); + return (ARCHIVE_FATAL); + } + mine->block_size = block_size; + mine->buffer = b; + mine->f = f; + /* + * If we can't fstat() the file, it may just be that it's not + * a file. (FILE * objects can wrap many kinds of I/O + * streams, some of which don't support fileno()).) + */ + if (fstat(fileno(mine->f), &st) == 0 && S_ISREG(st.st_mode)) { + archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); + /* Enable the seek optimization only for regular files. */ + mine->can_skip = 1; + } else + mine->can_skip = 0; + +#if defined(__CYGWIN__) + setmode(fileno(mine->f), O_BINARY); +#elif defined(_WIN32) + _setmode(_fileno(mine->f), _O_BINARY); +#endif + + return (archive_read_open2(a, mine, NULL, file_read, + file_skip, file_close)); +} + +static ssize_t +file_read(struct archive *a, void *client_data, const void **buff) +{ + struct read_FILE_data *mine = (struct read_FILE_data *)client_data; + ssize_t bytes_read; + + *buff = mine->buffer; + bytes_read = fread(mine->buffer, 1, mine->block_size, mine->f); + if (bytes_read < 0) { + archive_set_error(a, errno, "Error reading file"); + } + 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_FILE_data *mine = (struct read_FILE_data *)client_data; + + (void)a; /* UNUSED */ + + /* + * If we can't skip, return 0 as the amount we did step and + * the caller will work around by reading and discarding. + */ + if (!mine->can_skip) + return (0); + if (request == 0) + return (0); + +#if HAVE_FSEEKO + if (fseeko(mine->f, request, SEEK_CUR) != 0) +#else + if (fseek(mine->f, request, SEEK_CUR) != 0) +#endif + { + mine->can_skip = 0; + return (0); + } + return (request); +} + +static int +file_close(struct archive *a, void *client_data) +{ + struct read_FILE_data *mine = (struct read_FILE_data *)client_data; + + (void)a; /* UNUSED */ + if (mine->buffer != NULL) + free(mine->buffer); + free(mine); + return (ARCHIVE_OK); +} |