328 lines
8.6 KiB
C
328 lines
8.6 KiB
C
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/*-
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* Copyright (c) 2007 Joerg Sonnenberger
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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: head/lib/libarchive/archive_write_set_compression_program.c 201104 2009-12-28 03:14:30Z kientzle $");
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#ifdef HAVE_SYS_WAIT_H
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# include <sys/wait.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_FCNTL_H
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# include <fcntl.h>
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#endif
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.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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#include "archive_write_private.h"
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#if ARCHIVE_VERSION_NUMBER < 4000000
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int
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archive_write_set_compression_program(struct archive *a, const char *cmd)
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{
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__archive_write_filters_free(a);
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return (archive_write_add_filter_program(a, cmd));
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}
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#endif
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/* This capability is only available on POSIX systems. */
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#if (!defined(HAVE_PIPE) || !defined(HAVE_FCNTL) || \
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!(defined(HAVE_FORK) || defined(HAVE_VFORK))) && (!defined(_WIN32) || defined(__CYGWIN__))
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/*
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* On non-Posix systems, allow the program to build, but choke if
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* this function is actually invoked.
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*/
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int
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archive_write_add_filter_program(struct archive *_a, const char *cmd)
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{
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archive_set_error(_a, -1,
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"External compression programs not supported on this platform");
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return (ARCHIVE_FATAL);
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}
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#else
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#include "filter_fork.h"
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struct private_data {
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char *cmd;
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char *description;
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pid_t child;
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int child_stdin, child_stdout;
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char *child_buf;
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size_t child_buf_len, child_buf_avail;
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};
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static int archive_compressor_program_open(struct archive_write_filter *);
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static int archive_compressor_program_write(struct archive_write_filter *,
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const void *, size_t);
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static int archive_compressor_program_close(struct archive_write_filter *);
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static int archive_compressor_program_free(struct archive_write_filter *);
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/*
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* Add a filter to this write handle that passes all data through an
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* external program.
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*/
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int
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archive_write_add_filter_program(struct archive *_a, const char *cmd)
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{
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struct archive_write_filter *f = __archive_write_allocate_filter(_a);
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struct archive_write *a = (struct archive_write *)_a;
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struct private_data *data;
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static const char *prefix = "Program: ";
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archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
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ARCHIVE_STATE_NEW, "archive_write_add_filter_program");
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data = calloc(1, sizeof(*data));
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if (data == NULL) {
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archive_set_error(&a->archive, ENOMEM, "Out of memory");
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return (ARCHIVE_FATAL);
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}
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data->cmd = strdup(cmd);
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data->description = (char *)malloc(strlen(prefix) + strlen(cmd) + 1);
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strcpy(data->description, prefix);
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strcat(data->description, cmd);
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f->name = data->description;
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f->data = data;
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f->open = &archive_compressor_program_open;
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f->code = ARCHIVE_COMPRESSION_PROGRAM;
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return (ARCHIVE_OK);
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}
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/*
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* Setup callback.
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*/
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static int
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archive_compressor_program_open(struct archive_write_filter *f)
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{
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struct private_data *data = (struct private_data *)f->data;
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int ret;
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ret = __archive_write_open_filter(f->next_filter);
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if (ret != ARCHIVE_OK)
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return (ret);
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if (data->child_buf == NULL) {
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data->child_buf_len = 65536;
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data->child_buf_avail = 0;
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data->child_buf = malloc(data->child_buf_len);
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if (data->child_buf == NULL) {
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archive_set_error(f->archive, ENOMEM,
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"Can't allocate compression buffer");
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return (ARCHIVE_FATAL);
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}
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}
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if ((data->child = __archive_create_child(data->cmd,
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&data->child_stdin, &data->child_stdout)) == -1) {
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archive_set_error(f->archive, EINVAL,
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"Can't initialise filter");
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return (ARCHIVE_FATAL);
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}
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f->write = archive_compressor_program_write;
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f->close = archive_compressor_program_close;
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f->free = archive_compressor_program_free;
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return (0);
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}
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static ssize_t
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child_write(struct archive_write_filter *f, const char *buf, size_t buf_len)
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{
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struct private_data *data = f->data;
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ssize_t ret;
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if (data->child_stdin == -1)
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return (-1);
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if (buf_len == 0)
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return (-1);
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restart_write:
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do {
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ret = write(data->child_stdin, buf, buf_len);
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} while (ret == -1 && errno == EINTR);
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if (ret > 0)
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return (ret);
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if (ret == 0) {
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close(data->child_stdin);
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data->child_stdin = -1;
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fcntl(data->child_stdout, F_SETFL, 0);
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return (0);
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}
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if (ret == -1 && errno != EAGAIN)
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return (-1);
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if (data->child_stdout == -1) {
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fcntl(data->child_stdin, F_SETFL, 0);
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__archive_check_child(data->child_stdin, data->child_stdout);
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goto restart_write;
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}
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do {
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ret = read(data->child_stdout,
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data->child_buf + data->child_buf_avail,
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data->child_buf_len - data->child_buf_avail);
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} while (ret == -1 && errno == EINTR);
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if (ret == 0 || (ret == -1 && errno == EPIPE)) {
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close(data->child_stdout);
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data->child_stdout = -1;
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fcntl(data->child_stdin, F_SETFL, 0);
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goto restart_write;
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}
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if (ret == -1 && errno == EAGAIN) {
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__archive_check_child(data->child_stdin, data->child_stdout);
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goto restart_write;
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}
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if (ret == -1)
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return (-1);
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data->child_buf_avail += ret;
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ret = __archive_write_filter(f->next_filter,
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data->child_buf, data->child_buf_avail);
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if (ret <= 0)
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return (-1);
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if ((size_t)ret < data->child_buf_avail) {
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memmove(data->child_buf, data->child_buf + ret,
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data->child_buf_avail - ret);
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}
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data->child_buf_avail -= ret;
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goto restart_write;
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}
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/*
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* Write data to the compressed stream.
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*/
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static int
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archive_compressor_program_write(struct archive_write_filter *f,
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const void *buff, size_t length)
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{
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ssize_t ret;
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const char *buf;
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buf = buff;
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while (length > 0) {
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ret = child_write(f, buf, length);
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if (ret == -1 || ret == 0) {
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archive_set_error(f->archive, EIO,
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"Can't write to filter");
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return (ARCHIVE_FATAL);
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}
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length -= ret;
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buf += ret;
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}
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return (ARCHIVE_OK);
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}
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/*
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* Finish the compression...
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*/
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static int
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archive_compressor_program_close(struct archive_write_filter *f)
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{
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struct private_data *data = (struct private_data *)f->data;
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int ret, r1, status;
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ssize_t bytes_read;
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ret = 0;
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close(data->child_stdin);
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data->child_stdin = -1;
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fcntl(data->child_stdout, F_SETFL, 0);
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for (;;) {
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do {
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bytes_read = read(data->child_stdout,
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data->child_buf + data->child_buf_avail,
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data->child_buf_len - data->child_buf_avail);
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} while (bytes_read == -1 && errno == EINTR);
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if (bytes_read == 0 || (bytes_read == -1 && errno == EPIPE))
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break;
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if (bytes_read == -1) {
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archive_set_error(f->archive, errno,
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"Read from filter failed unexpectedly.");
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ret = ARCHIVE_FATAL;
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goto cleanup;
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}
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data->child_buf_avail += bytes_read;
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ret = __archive_write_filter(f->next_filter,
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data->child_buf, data->child_buf_avail);
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if (ret != ARCHIVE_OK) {
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ret = ARCHIVE_FATAL;
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goto cleanup;
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}
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data->child_buf_avail = 0;
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}
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cleanup:
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/* Shut down the child. */
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if (data->child_stdin != -1)
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close(data->child_stdin);
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if (data->child_stdout != -1)
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close(data->child_stdout);
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while (waitpid(data->child, &status, 0) == -1 && errno == EINTR)
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continue;
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if (status != 0) {
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archive_set_error(f->archive, EIO,
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"Filter exited with failure.");
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ret = ARCHIVE_FATAL;
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}
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r1 = __archive_write_close_filter(f->next_filter);
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return (r1 < ret ? r1 : ret);
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}
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static int
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archive_compressor_program_free(struct archive_write_filter *f)
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{
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struct private_data *data = (struct private_data *)f->data;
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free(data->cmd);
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free(data->description);
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free(data->child_buf);
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free(data);
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f->data = NULL;
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return (ARCHIVE_OK);
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}
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#endif /* !defined(HAVE_PIPE) || !defined(HAVE_VFORK) || !defined(HAVE_FCNTL) */
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