xbps/lib/archive.c

197 lines
5.0 KiB
C

/*-
* Copyright (c) 2008-2013 Juan Romero Pardines.
* 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 ``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 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 <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <zlib.h>
#include "xbps_api_impl.h"
/*
* Takes a compressed data buffer, decompresses it and returns the
* new buffer uncompressed if all was right.
*/
#define _READ_CHUNK 8192
static char *
uncompress_plist_data(char *xml, size_t len)
{
z_stream strm;
unsigned char *out;
char *uncomp_xml = NULL;
size_t have;
ssize_t totalsize = 0;
int rv = 0;
assert(xml != NULL);
/* Decompress the mmap'ed buffer with zlib */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
/* 15+16 to use gzip method */
if (inflateInit2(&strm, 15+16) != Z_OK)
return NULL;
strm.avail_in = len;
strm.next_in = (unsigned char *)xml;
/* Output buffer (uncompressed) */
if ((uncomp_xml = malloc(_READ_CHUNK)) == NULL) {
(void)inflateEnd(&strm);
return NULL;
}
/* temp output buffer for inflate */
if ((out = malloc(_READ_CHUNK)) == NULL) {
(void)inflateEnd(&strm);
free(uncomp_xml);
return NULL;
}
/* Inflate the input buffer and copy into 'uncomp_xml' */
do {
strm.avail_out = _READ_CHUNK;
strm.next_out = out;
rv = inflate(&strm, Z_NO_FLUSH);
switch (rv) {
case Z_DATA_ERROR:
case Z_STREAM_ERROR:
case Z_NEED_DICT:
case Z_MEM_ERROR:
case Z_BUF_ERROR:
case Z_VERSION_ERROR:
(void)inflateEnd(&strm);
free(uncomp_xml);
free(out);
return NULL;
}
have = _READ_CHUNK - strm.avail_out;
totalsize += have;
uncomp_xml = realloc(uncomp_xml, totalsize);
memcpy(uncomp_xml + totalsize - have, out, have);
} while (strm.avail_out == 0);
/* we are done */
(void)inflateEnd(&strm);
free(out);
return uncomp_xml;
}
#undef _READ_CHUNK
xbps_dictionary_t HIDDEN
xbps_archive_get_dictionary(struct archive *ar, struct archive_entry *entry)
{
xbps_dictionary_t d = NULL;
size_t buflen;
ssize_t nbytes = -1;
char *buf, *uncomp_buf;
assert(ar != NULL);
assert(entry != NULL);
buflen = (size_t)archive_entry_size(entry);
buf = malloc(buflen);
if (buf == NULL)
return NULL;
nbytes = archive_read_data(ar, buf, buflen);
if ((size_t)nbytes != buflen) {
free(buf);
return NULL;
}
/* If blob is already a dictionary we are done */
d = xbps_dictionary_internalize(buf);
if (xbps_object_type(d) == XBPS_TYPE_DICTIONARY) {
free(buf);
return d;
}
/* Try to uncompress blob */
uncomp_buf = uncompress_plist_data(buf, buflen);
if (uncomp_buf == NULL) {
/* Error while decompressing */
free(uncomp_buf);
xbps_object_release(d);
d = NULL;
} else {
/* We have the uncompressed data */
d = xbps_dictionary_internalize(uncomp_buf);
free(uncomp_buf);
}
free(buf);
return d;
}
int
xbps_archive_append_buf(struct archive *ar, const void *buf, const size_t buflen,
const char *fname, const mode_t mode, const char *uname, const char *gname)
{
struct archive_entry *entry;
time_t tm;
assert(ar);
assert(buf);
assert(fname);
assert(uname);
assert(gname);
tm = time(NULL);
entry = archive_entry_new();
assert(entry);
archive_entry_set_filetype(entry, AE_IFREG);
archive_entry_set_perm(entry, mode);
archive_entry_set_uname(entry, uname);
archive_entry_set_gname(entry, gname);
archive_entry_set_pathname(entry, fname);
archive_entry_set_size(entry, buflen);
archive_entry_set_atime(entry, tm, 0);
archive_entry_set_mtime(entry, tm, 0);
archive_entry_set_ctime(entry, tm, 0);
if (archive_write_header(ar, entry) != ARCHIVE_OK) {
archive_entry_free(entry);
return archive_errno(ar);
}
if (archive_write_data(ar, buf, buflen) != ARCHIVE_OK) {
archive_entry_free(entry);
return archive_errno(ar);
}
archive_write_finish_entry(ar);
archive_entry_free(entry);
return 0;
}