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-rw-r--r--lzip_index.c113
1 files changed, 66 insertions, 47 deletions
diff --git a/lzip_index.c b/lzip_index.c
index b6cfc20..5db5022 100644
--- a/lzip_index.c
+++ b/lzip_index.c
@@ -1,28 +1,28 @@
-/* Clzip - LZMA lossless data compressor
- Copyright (C) 2010-2019 Antonio Diaz Diaz.
+/* Clzip - LZMA lossless data compressor
+ Copyright (C) 2010-2021 Antonio Diaz Diaz.
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 2 of the License, or
- (at your option) any later version.
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 2 of the License, or
+ (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _FILE_OFFSET_BITS 64
#include <errno.h>
#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
#include <stdint.h>
+#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
#include "lzip.h"
@@ -58,8 +58,7 @@ static bool push_back_member( struct Lzip_index * const li,
struct Member * p;
void * tmp = resize_buffer( li->member_vector,
( li->members + 1 ) * sizeof li->member_vector[0] );
- if( !tmp )
- { add_error( li, "Not enough memory." ); li->retval = 1; return false; }
+ if( !tmp ) { add_error( li, mem_msg ); li->retval = 1; return false; }
li->member_vector = (struct Member *)tmp;
p = &(li->member_vector[li->members]);
init_member( p, dp, ds, mp, ms, dict_size );
@@ -89,6 +88,19 @@ static void Li_reverse_member_vector( struct Lzip_index * const li )
}
+static bool Li_check_header_error( struct Lzip_index * const li,
+ const Lzip_header header )
+ {
+ if( !Lh_verify_magic( header ) )
+ { add_error( li, bad_magic_msg ); li->retval = 2; return true; }
+ if( !Lh_verify_version( header ) )
+ { add_error( li, bad_version( Lh_version( header ) ) ); li->retval = 2;
+ return true; }
+ if( !isvalid_ds( Lh_get_dictionary_size( header ) ) )
+ { add_error( li, bad_dict_msg ); li->retval = 2; return true; }
+ return false;
+ }
+
static void Li_set_errno_error( struct Lzip_index * const li,
const char * const msg )
{
@@ -106,9 +118,18 @@ static void Li_set_num_error( struct Lzip_index * const li,
}
+static bool Li_read_header( struct Lzip_index * const li, const int fd,
+ Lzip_header header, const long long pos )
+ {
+ if( seek_read( fd, header, Lh_size, pos ) != Lh_size )
+ { Li_set_errno_error( li, "Error reading member header: " ); return false; }
+ return true;
+ }
+
+
/* If successful, push last member and set pos to member header. */
-static bool Li_skip_trailing_data( struct Lzip_index * const li,
- const int fd, long long * const pos,
+static bool Li_skip_trailing_data( struct Lzip_index * const li, const int fd,
+ unsigned long long * const pos,
const bool ignore_trailing,
const bool loose_trailing )
{
@@ -135,36 +156,40 @@ static bool Li_skip_trailing_data( struct Lzip_index * const li,
if( buffer[i-1] <= max_msb ) /* most significant byte of member_size */
{
Lzip_header header;
+ const Lzip_header * header2;
const Lzip_trailer * const trailer =
(const Lzip_trailer *)( buffer + i - Lt_size );
const unsigned long long member_size = Lt_get_member_size( *trailer );
unsigned dictionary_size;
+ bool full_h2;
if( member_size == 0 ) /* skip trailing zeros */
{ while( i > Lt_size && buffer[i-9] == 0 ) --i; continue; }
if( member_size > ipos + i || !Lt_verify_consistency( *trailer ) )
continue;
- if( seek_read( fd, header, Lh_size,
- ipos + i - member_size ) != Lh_size )
- { Li_set_errno_error( li, "Error reading member header: " );
- return false; }
- dictionary_size = Lh_get_dictionary_size( header );
- if( !Lh_verify_magic( header ) || !Lh_verify_version( header ) ||
- !isvalid_ds( dictionary_size ) ) continue;
- if( Lh_verify_prefix( buffer + i, bsize - i ) )
+ if( !Li_read_header( li, fd, header, ipos + i - member_size ) )
+ return false;
+ if( !Lh_verify( header ) ) continue;
+ header2 = (const Lzip_header *)( buffer + i );
+ full_h2 = bsize - i >= Lh_size;
+ if( Lh_verify_prefix( *header2, bsize - i ) ) /* last member */
{
- add_error( li, "Last member in input file is truncated or corrupt." );
+ if( !full_h2 ) add_error( li, "Last member in input file is truncated." );
+ else if( !Li_check_header_error( li, *header2 ) )
+ add_error( li, "Last member in input file is truncated or corrupt." );
li->retval = 2; return false;
}
- if( !loose_trailing && bsize - i >= Lh_size &&
- Lh_verify_corrupt( buffer + i ) )
+ if( !loose_trailing && full_h2 && Lh_verify_corrupt( *header2 ) )
{ add_error( li, corrupt_mm_msg ); li->retval = 2; return false; }
if( !ignore_trailing )
{ add_error( li, trailing_msg ); li->retval = 2; return false; }
*pos = ipos + i - member_size;
+ dictionary_size = Lh_get_dictionary_size( header );
+ if( li->dictionary_size < dictionary_size )
+ li->dictionary_size = dictionary_size;
return push_back_member( li, 0, Lt_get_data_size( *trailer ), *pos,
member_size, dictionary_size );
}
- if( ipos <= 0 )
+ if( ipos == 0 )
{ Li_set_num_error( li, "Bad trailer at pos ", *pos - Lt_size );
return false; }
bsize = buffer_size;
@@ -180,7 +205,7 @@ bool Li_init( struct Lzip_index * const li, const int infd,
const bool ignore_trailing, const bool loose_trailing )
{
Lzip_header header;
- long long pos;
+ unsigned long long pos;
long i;
li->member_vector = 0;
li->error = 0;
@@ -188,6 +213,7 @@ bool Li_init( struct Lzip_index * const li, const int infd,
li->members = 0;
li->error_size = 0;
li->retval = 0;
+ li->dictionary_size = 0;
if( li->insize < 0 )
{ Li_set_errno_error( li, "Input file is not seekable: " ); return false; }
if( li->insize < min_member_size )
@@ -197,15 +223,8 @@ bool Li_init( struct Lzip_index * const li, const int infd,
{ add_error( li, "Input file is too long (2^63 bytes or more)." );
li->retval = 2; return false; }
- if( seek_read( infd, header, Lh_size, 0 ) != Lh_size )
- { Li_set_errno_error( li, "Error reading member header: " ); return false; }
- if( !Lh_verify_magic( header ) )
- { add_error( li, bad_magic_msg ); li->retval = 2; return false; }
- if( !Lh_verify_version( header ) )
- { add_error( li, bad_version( Lh_version( header ) ) ); li->retval = 2;
- return false; }
- if( !isvalid_ds( Lh_get_dictionary_size( header ) ) )
- { add_error( li, bad_dict_msg ); li->retval = 2; return false; }
+ if( !Li_read_header( li, infd, header, 0 ) ) return false;
+ if( Li_check_header_error( li, header ) ) return false;
pos = li->insize; /* always points to a header or to EOF */
while( pos >= min_member_size )
@@ -216,19 +235,16 @@ bool Li_init( struct Lzip_index * const li, const int infd,
if( seek_read( infd, trailer, Lt_size, pos - Lt_size ) != Lt_size )
{ Li_set_errno_error( li, "Error reading member trailer: " ); break; }
member_size = Lt_get_member_size( trailer );
- if( member_size > (unsigned long long)pos || !Lt_verify_consistency( trailer ) )
- {
+ if( member_size > pos || !Lt_verify_consistency( trailer ) )
+ { /* bad trailer */
if( li->members <= 0 )
{ if( Li_skip_trailing_data( li, infd, &pos, ignore_trailing,
loose_trailing ) ) continue; else return false; }
Li_set_num_error( li, "Bad trailer at pos ", pos - Lt_size );
break;
}
- if( seek_read( infd, header, Lh_size, pos - member_size ) != Lh_size )
- { Li_set_errno_error( li, "Error reading member header: " ); break; }
- dictionary_size = Lh_get_dictionary_size( header );
- if( !Lh_verify_magic( header ) || !Lh_verify_version( header ) ||
- !isvalid_ds( dictionary_size ) )
+ if( !Li_read_header( li, infd, header, pos - member_size ) ) break;
+ if( !Lh_verify( header ) ) /* bad header */
{
if( li->members <= 0 )
{ if( Li_skip_trailing_data( li, infd, &pos, ignore_trailing,
@@ -237,6 +253,9 @@ bool Li_init( struct Lzip_index * const li, const int infd,
break;
}
pos -= member_size;
+ dictionary_size = Lh_get_dictionary_size( header );
+ if( li->dictionary_size < dictionary_size )
+ li->dictionary_size = dictionary_size;
if( !push_back_member( li, 0, Lt_get_data_size( trailer ), pos,
member_size, dictionary_size ) )
return false;
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 11:03:50 +0000