94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
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/*-
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* Copyright (c) 2003-2007 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD: src/lib/libarchive/archive_read_data_into_fd.c,v 1.16 2008/05/23 05:01:29 cperciva Exp $");
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "archive.h"
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#include "archive_private.h"
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/* Maximum amount of data to write at one time. */
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#define MAX_WRITE (1024 * 1024)
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/*
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* This implementation minimizes copying of data and is sparse-file aware.
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*/
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int
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archive_read_data_into_fd(struct archive *a, int fd)
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{
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int r;
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const void *buff;
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size_t size, bytes_to_write;
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ssize_t bytes_written, total_written;
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off_t offset;
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off_t output_offset;
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__archive_check_magic(a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_DATA, "archive_read_data_into_fd");
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total_written = 0;
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output_offset = 0;
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while ((r = archive_read_data_block(a, &buff, &size, &offset)) ==
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ARCHIVE_OK) {
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const char *p = buff;
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if (offset > output_offset) {
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output_offset = lseek(fd,
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offset - output_offset, SEEK_CUR);
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if (output_offset != offset) {
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archive_set_error(a, errno, "Seek error");
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return (ARCHIVE_FATAL);
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}
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}
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while (size > 0) {
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bytes_to_write = size;
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if (bytes_to_write > MAX_WRITE)
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bytes_to_write = MAX_WRITE;
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bytes_written = write(fd, p, bytes_to_write);
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if (bytes_written < 0) {
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archive_set_error(a, errno, "Write error");
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return (ARCHIVE_FATAL);
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}
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output_offset += bytes_written;
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total_written += bytes_written;
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p += bytes_written;
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size -= bytes_written;
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}
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}
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if (r != ARCHIVE_EOF)
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return (r);
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return (ARCHIVE_OK);
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}
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