diff options
Diffstat (limited to 'src/libs/3rdparty/libarchive/archive_read_data_into_fd.c')
| -rw-r--r-- | src/libs/3rdparty/libarchive/archive_read_data_into_fd.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/libs/3rdparty/libarchive/archive_read_data_into_fd.c b/src/libs/3rdparty/libarchive/archive_read_data_into_fd.c new file mode 100644 index 000000000..f16ca5c82 --- /dev/null +++ b/src/libs/3rdparty/libarchive/archive_read_data_into_fd.c @@ -0,0 +1,144 @@ +/*- + * 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_data_into_fd.c,v 1.16 2008/05/23 05:01:29 cperciva Exp $"); + +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include "archive.h" +#include "archive_private.h" + +/* Maximum amount of data to write at one time. */ +#define MAX_WRITE (1024 * 1024) + +/* + * This implementation minimizes copying of data and is sparse-file aware. + */ +static int +pad_to(struct archive *a, int fd, int can_lseek, + size_t nulls_size, const char *nulls, + int64_t target_offset, int64_t actual_offset) +{ + size_t to_write; + ssize_t bytes_written; + + if (can_lseek) { + actual_offset = lseek(fd, + target_offset - actual_offset, SEEK_CUR); + if (actual_offset != target_offset) { + archive_set_error(a, errno, "Seek error"); + return (ARCHIVE_FATAL); + } + return (ARCHIVE_OK); + } + while (target_offset > actual_offset) { + to_write = nulls_size; + if (target_offset < actual_offset + (int64_t)nulls_size) + to_write = (size_t)(target_offset - actual_offset); + bytes_written = write(fd, nulls, to_write); + if (bytes_written < 0) { + archive_set_error(a, errno, "Write error"); + return (ARCHIVE_FATAL); + } + actual_offset += bytes_written; + } + return (ARCHIVE_OK); +} + + +int +archive_read_data_into_fd(struct archive *a, int fd) +{ + struct stat st; + int r, r2; + const void *buff; + size_t size, bytes_to_write; + ssize_t bytes_written; + int64_t target_offset; + int64_t actual_offset = 0; + int can_lseek; + char *nulls = NULL; + size_t nulls_size = 16384; + + archive_check_magic(a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_DATA, + "archive_read_data_into_fd"); + + can_lseek = (fstat(fd, &st) == 0) && S_ISREG(st.st_mode); + if (!can_lseek) { + nulls = calloc(1, nulls_size); + if (!nulls) { + r = ARCHIVE_FATAL; + goto cleanup; + } + } + + while ((r = archive_read_data_block(a, &buff, &size, &target_offset)) == + ARCHIVE_OK) { + const char *p = buff; + if (target_offset > actual_offset) { + r = pad_to(a, fd, can_lseek, nulls_size, nulls, + target_offset, actual_offset); + if (r != ARCHIVE_OK) + break; + actual_offset = target_offset; + } + while (size > 0) { + bytes_to_write = size; + if (bytes_to_write > MAX_WRITE) + bytes_to_write = MAX_WRITE; + bytes_written = write(fd, p, bytes_to_write); + if (bytes_written < 0) { + archive_set_error(a, errno, "Write error"); + r = ARCHIVE_FATAL; + goto cleanup; + } + actual_offset += bytes_written; + p += bytes_written; + size -= bytes_written; + } + } + + if (r == ARCHIVE_EOF && target_offset > actual_offset) { + r2 = pad_to(a, fd, can_lseek, nulls_size, nulls, + target_offset, actual_offset); + if (r2 != ARCHIVE_OK) + r = r2; + } + +cleanup: + free(nulls); + if (r != ARCHIVE_EOF) + return (r); + return (ARCHIVE_OK); +} |