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/*-
* Copyright (c) 2009 Michihiro NAKAJIMA
* 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"
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "archive.h"
#include "archive_endian.h"
#include "archive_private.h"
#include "archive_read_private.h"
struct rpm {
int64_t total_in;
size_t hpos;
size_t hlen;
unsigned char header[16];
enum {
ST_LEAD, /* Skipping 'Lead' section. */
ST_HEADER, /* Reading 'Header' section;
* first 16 bytes. */
ST_HEADER_DATA, /* Skipping 'Header' section. */
ST_PADDING, /* Skipping padding data after the
* 'Header' section. */
ST_ARCHIVE /* Reading 'Archive' section. */
} state;
int first_header;
};
#define RPM_LEAD_SIZE 96 /* Size of 'Lead' section. */
static int rpm_bidder_bid(struct archive_read_filter_bidder *,
struct archive_read_filter *);
static int rpm_bidder_init(struct archive_read_filter *);
static ssize_t rpm_filter_read(struct archive_read_filter *,
const void **);
static int rpm_filter_close(struct archive_read_filter *);
#if ARCHIVE_VERSION_NUMBER < 4000000
/* Deprecated; remove in libarchive 4.0 */
int
archive_read_support_compression_rpm(struct archive *a)
{
return archive_read_support_filter_rpm(a);
}
#endif
int
archive_read_support_filter_rpm(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *bidder;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_filter_rpm");
if (__archive_read_get_bidder(a, &bidder) != ARCHIVE_OK)
return (ARCHIVE_FATAL);
bidder->data = NULL;
bidder->bid = rpm_bidder_bid;
bidder->init = rpm_bidder_init;
bidder->options = NULL;
bidder->free = NULL;
return (ARCHIVE_OK);
}
static int
rpm_bidder_bid(struct archive_read_filter_bidder *self,
struct archive_read_filter *filter)
{
const unsigned char *b;
ssize_t avail;
int bits_checked;
(void)self; /* UNUSED */
b = __archive_read_filter_ahead(filter, 8, &avail);
if (b == NULL)
return (0);
bits_checked = 0;
/*
* Verify Header Magic Bytes : 0XED 0XAB 0XEE 0XDB
*/
if (memcmp(b, "\xED\xAB\xEE\xDB", 4) != 0)
return (0);
bits_checked += 32;
/*
* Check major version.
*/
if (b[4] != 3 && b[4] != 4)
return (0);
bits_checked += 8;
/*
* Check package type; binary or source.
*/
if (b[6] != 0)
return (0);
bits_checked += 8;
if (b[7] != 0 && b[7] != 1)
return (0);
bits_checked += 8;
return (bits_checked);
}
static int
rpm_bidder_init(struct archive_read_filter *self)
{
struct rpm *rpm;
self->code = ARCHIVE_FILTER_RPM;
self->name = "rpm";
self->read = rpm_filter_read;
self->skip = NULL; /* not supported */
self->close = rpm_filter_close;
rpm = (struct rpm *)calloc(sizeof(*rpm), 1);
if (rpm == NULL) {
archive_set_error(&self->archive->archive, ENOMEM,
"Can't allocate data for rpm");
return (ARCHIVE_FATAL);
}
self->data = rpm;
rpm->state = ST_LEAD;
return (ARCHIVE_OK);
}
static ssize_t
rpm_filter_read(struct archive_read_filter *self, const void **buff)
{
struct rpm *rpm;
const unsigned char *b;
ssize_t avail_in, total;
size_t used, n;
uint32_t section;
uint32_t bytes;
rpm = (struct rpm *)self->data;
*buff = NULL;
total = avail_in = 0;
b = NULL;
used = 0;
do {
if (b == NULL) {
b = __archive_read_filter_ahead(self->upstream, 1,
&avail_in);
if (b == NULL) {
if (avail_in < 0)
return (ARCHIVE_FATAL);
else
break;
}
}
switch (rpm->state) {
case ST_LEAD:
if (rpm->total_in + avail_in < RPM_LEAD_SIZE)
used += avail_in;
else {
n = (size_t)(RPM_LEAD_SIZE - rpm->total_in);
used += n;
b += n;
rpm->state = ST_HEADER;
rpm->hpos = 0;
rpm->hlen = 0;
rpm->first_header = 1;
}
break;
case ST_HEADER:
n = 16 - rpm->hpos;
if (n > avail_in - used)
n = avail_in - used;
memcpy(rpm->header+rpm->hpos, b, n);
b += n;
used += n;
rpm->hpos += n;
if (rpm->hpos == 16) {
if (rpm->header[0] != 0x8e ||
rpm->header[1] != 0xad ||
rpm->header[2] != 0xe8 ||
rpm->header[3] != 0x01) {
if (rpm->first_header) {
archive_set_error(
&self->archive->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Unrecoginized rpm header");
return (ARCHIVE_FATAL);
}
rpm->state = ST_ARCHIVE;
*buff = rpm->header;
total = rpm->hpos;
break;
}
/* Calculate 'Header' length. */
section = archive_be32dec(rpm->header+8);
bytes = archive_be32dec(rpm->header+12);
rpm->hlen = 16 + section * 16 + bytes;
rpm->state = ST_HEADER_DATA;
rpm->first_header = 0;
}
break;
case ST_HEADER_DATA:
n = rpm->hlen - rpm->hpos;
if (n > avail_in - used)
n = avail_in - used;
b += n;
used += n;
rpm->hpos += n;
if (rpm->hpos == rpm->hlen)
rpm->state = ST_PADDING;
break;
case ST_PADDING:
while (used < (size_t)avail_in) {
if (*b != 0) {
/* Read next header. */
rpm->state = ST_HEADER;
rpm->hpos = 0;
rpm->hlen = 0;
break;
}
b++;
used++;
}
break;
case ST_ARCHIVE:
*buff = b;
total = avail_in;
used = avail_in;
break;
}
if (used == (size_t)avail_in) {
rpm->total_in += used;
__archive_read_filter_consume(self->upstream, used);
b = NULL;
used = 0;
}
} while (total == 0 && avail_in > 0);
if (used > 0 && b != NULL) {
rpm->total_in += used;
__archive_read_filter_consume(self->upstream, used);
}
return (total);
}
static int
rpm_filter_close(struct archive_read_filter *self)
{
struct rpm *rpm;
rpm = (struct rpm *)self->data;
free(rpm);
return (ARCHIVE_OK);
}
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