summaryrefslogtreecommitdiffstats
path: root/file_index.c
diff options
context:
space:
mode:
Diffstat (limited to 'file_index.c')
-rw-r--r--file_index.c272
1 files changed, 0 insertions, 272 deletions
diff --git a/file_index.c b/file_index.c
deleted file mode 100644
index 1872d67..0000000
--- a/file_index.c
+++ /dev/null
@@ -1,272 +0,0 @@
-/* Lunzip - Decompressor for the lzip format
- Copyright (C) 2010-2018 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 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/>.
-*/
-
-#define _FILE_OFFSET_BITS 64
-
-#include <errno.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-#include "lzip.h"
-#include "file_index.h"
-
-
-static int seek_read( const int fd, uint8_t * const buf, const int size,
- const long long pos )
- {
- if( lseek( fd, pos, SEEK_SET ) == pos )
- return readblock( fd, buf, size );
- return 0;
- }
-
-
-static bool add_error( struct File_index * const fi, const char * const msg )
- {
- const int len = strlen( msg );
- void * tmp = resize_buffer( fi->error, fi->error_size + len + 1 );
- if( !tmp ) return false;
- fi->error = (char *)tmp;
- strncpy( fi->error + fi->error_size, msg, len + 1 );
- fi->error_size += len;
- return true;
- }
-
-
-static bool push_back_member( struct File_index * const fi,
- const long long dp, const long long ds,
- const long long mp, const long long ms,
- const unsigned dict_size )
- {
- struct Member * p;
- void * tmp = resize_buffer( fi->member_vector,
- ( fi->members + 1 ) * sizeof fi->member_vector[0] );
- if( !tmp )
- { add_error( fi, "Not enough memory." ); fi->retval = 1; return false; }
- fi->member_vector = (struct Member *)tmp;
- p = &(fi->member_vector[fi->members]);
- init_member( p, dp, ds, mp, ms, dict_size );
- ++fi->members;
- return true;
- }
-
-
-static void Fi_free_member_vector( struct File_index * const fi )
- {
- if( fi->member_vector )
- { free( fi->member_vector ); fi->member_vector = 0; }
- fi->members = 0;
- }
-
-
-static void Fi_reverse_member_vector( struct File_index * const fi )
- {
- struct Member tmp;
- long i;
- for( i = 0; i < fi->members / 2; ++i )
- {
- tmp = fi->member_vector[i];
- fi->member_vector[i] = fi->member_vector[fi->members-i-1];
- fi->member_vector[fi->members-i-1] = tmp;
- }
- }
-
-
-static void Fi_set_errno_error( struct File_index * const fi,
- const char * const msg )
- {
- add_error( fi, msg ); add_error( fi, strerror( errno ) );
- fi->retval = 1;
- }
-
-static void Fi_set_num_error( struct File_index * const fi,
- const char * const msg, unsigned long long num )
- {
- char buf[80];
- snprintf( buf, sizeof buf, "%s%llu", msg, num );
- add_error( fi, buf );
- fi->retval = 2;
- }
-
-
-/* If successful, push last member and set pos to member header. */
-static bool Fi_skip_trailing_data( struct File_index * const fi,
- const int fd, long long * const pos,
- const bool ignore_trailing,
- const bool loose_trailing )
- {
- enum { block_size = 16384,
- buffer_size = block_size + Ft_size - 1 + Fh_size };
- uint8_t buffer[buffer_size];
- int bsize = *pos % block_size; /* total bytes in buffer */
- int search_size, rd_size;
- unsigned long long ipos;
- int i;
- if( bsize <= buffer_size - block_size ) bsize += block_size;
- search_size = bsize; /* bytes to search for trailer */
- rd_size = bsize; /* bytes to read from file */
- ipos = *pos - rd_size; /* aligned to block_size */
- if( *pos < min_member_size ) return false;
-
- while( true )
- {
- const uint8_t max_msb = ( ipos + search_size ) >> 56;
- if( seek_read( fd, buffer, rd_size, ipos ) != rd_size )
- { Fi_set_errno_error( fi, "Error seeking member trailer: " );
- return false; }
- for( i = search_size; i >= Ft_size; --i )
- if( buffer[i-1] <= max_msb ) /* most significant byte of member_size */
- {
- File_header header;
- File_trailer * trailer = (File_trailer *)( buffer + i - Ft_size );
- const unsigned long long member_size = Ft_get_member_size( *trailer );
- unsigned dictionary_size;
- if( member_size == 0 )
- { while( i > Ft_size && buffer[i-9] == 0 ) --i; continue; }
- if( member_size < min_member_size || member_size > ipos + i )
- continue;
- if( seek_read( fd, header, Fh_size,
- ipos + i - member_size ) != Fh_size )
- { Fi_set_errno_error( fi, "Error reading member header: " );
- return false; }
- dictionary_size = Fh_get_dictionary_size( header );
- if( !Fh_verify_magic( header ) || !Fh_verify_version( header ) ||
- !isvalid_ds( dictionary_size ) ) continue;
- if( Fh_verify_prefix( buffer + i, bsize - i ) )
- {
- add_error( fi, "Last member in input file is truncated or corrupt." );
- fi->retval = 2; return false;
- }
- if( !loose_trailing && bsize - i >= Fh_size &&
- Fh_verify_corrupt( buffer + i ) )
- { add_error( fi, corrupt_mm_msg ); fi->retval = 2; return false; }
- if( !ignore_trailing )
- { add_error( fi, trailing_msg ); fi->retval = 2; return false; }
- *pos = ipos + i - member_size;
- return push_back_member( fi, 0, Ft_get_data_size( *trailer ), *pos,
- member_size, dictionary_size );
- }
- if( ipos <= 0 )
- { Fi_set_num_error( fi, "Member size in trailer is corrupt at pos ",
- *pos - 8 );
- return false; }
- bsize = buffer_size;
- search_size = bsize - Fh_size;
- rd_size = block_size;
- ipos -= rd_size;
- memcpy( buffer + rd_size, buffer, buffer_size - rd_size );
- }
- }
-
-
-bool Fi_init( struct File_index * const fi, const int infd,
- const bool ignore_trailing, const bool loose_trailing )
- {
- File_header header;
- long long pos;
- long i;
- fi->member_vector = 0;
- fi->error = 0;
- fi->isize = lseek( infd, 0, SEEK_END );
- fi->members = 0;
- fi->error_size = 0;
- fi->retval = 0;
- if( fi->isize < 0 )
- { Fi_set_errno_error( fi, "Input file is not seekable: " ); return false; }
- if( fi->isize < min_member_size )
- { add_error( fi, "Input file is too short." ); fi->retval = 2;
- return false; }
- if( fi->isize > INT64_MAX )
- { add_error( fi, "Input file is too long (2^63 bytes or more)." );
- fi->retval = 2; return false; }
-
- if( seek_read( infd, header, Fh_size, 0 ) != Fh_size )
- { Fi_set_errno_error( fi, "Error reading member header: " ); return false; }
- if( !Fh_verify_magic( header ) )
- { add_error( fi, bad_magic_msg ); fi->retval = 2; return false; }
- if( !Fh_verify_version( header ) )
- { add_error( fi, bad_version( Fh_version( header ) ) ); fi->retval = 2;
- return false; }
- if( !isvalid_ds( Fh_get_dictionary_size( header ) ) )
- { add_error( fi, bad_dict_msg ); fi->retval = 2; return false; }
-
- pos = fi->isize; /* always points to a header or to EOF */
- while( pos >= min_member_size )
- {
- File_trailer trailer;
- unsigned long long member_size;
- unsigned dictionary_size;
- if( seek_read( infd, trailer, Ft_size, pos - Ft_size ) != Ft_size )
- { Fi_set_errno_error( fi, "Error reading member trailer: " ); break; }
- member_size = Ft_get_member_size( trailer );
- if( member_size < min_member_size || member_size > (unsigned long long)pos )
- {
- if( fi->members <= 0 )
- { if( Fi_skip_trailing_data( fi, infd, &pos, ignore_trailing,
- loose_trailing ) ) continue; else return false; }
- Fi_set_num_error( fi, "Member size in trailer is corrupt at pos ", pos - 8 );
- break;
- }
- if( seek_read( infd, header, Fh_size, pos - member_size ) != Fh_size )
- { Fi_set_errno_error( fi, "Error reading member header: " ); break; }
- dictionary_size = Fh_get_dictionary_size( header );
- if( !Fh_verify_magic( header ) || !Fh_verify_version( header ) ||
- !isvalid_ds( dictionary_size ) )
- {
- if( fi->members <= 0 )
- { if( Fi_skip_trailing_data( fi, infd, &pos, ignore_trailing,
- loose_trailing ) ) continue; else return false; }
- Fi_set_num_error( fi, "Bad header at pos ", pos - member_size );
- break;
- }
- pos -= member_size;
- if( !push_back_member( fi, 0, Ft_get_data_size( trailer ), pos,
- member_size, dictionary_size ) )
- return false;
- }
- if( pos != 0 || fi->members <= 0 )
- {
- Fi_free_member_vector( fi );
- if( fi->retval == 0 )
- { add_error( fi, "Can't create file index." ); fi->retval = 2; }
- return false;
- }
- Fi_reverse_member_vector( fi );
- for( i = 0; i < fi->members - 1; ++i )
- {
- const long long end = block_end( fi->member_vector[i].dblock );
- if( end < 0 || end > INT64_MAX )
- {
- Fi_free_member_vector( fi );
- add_error( fi, "Data in input file is too long (2^63 bytes or more)." );
- fi->retval = 2; return false;
- }
- fi->member_vector[i+1].dblock.pos = end;
- }
- return true;
- }
-
-
-void Fi_free( struct File_index * const fi )
- {
- Fi_free_member_vector( fi );
- if( fi->error ) { free( fi->error ); fi->error = 0; }
- fi->error_size = 0;
- }
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 12:45:35 +0000