mirror of
https://github.com/scp-fs2open/fs2open.github.com.git
synced 2026-11-10 12:41:35 -10:00
311 lines
6.9 KiB
C++
311 lines
6.9 KiB
C++
/*
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* Copyright (C) Volition, Inc. 1999. All rights reserved.
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*
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* All source code herein is the property of Volition, Inc. You may not sell
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* or otherwise commercially exploit the source or things you created based on the
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* source.
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*
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*/
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/*
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* $Logfile: /Freespace2/code/CFile/CfileArchive.cpp $
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* $Revision: 2.7 $
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* $Date: 2005-07-24 18:31:17 $
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* $Author: taylor $
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*
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* Low-level code for reading data out of large archive files or normal files. All
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* reads/seeks come through here.
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*
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* $Log: not supported by cvs2svn $
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* Revision 2.6 2004/07/26 20:47:25 Kazan
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* remove MCD complete
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*
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* Revision 2.5 2004/07/12 16:32:42 Kazan
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* MCD - define _MCD_CHECK to use memory tracking
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*
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* Revision 2.4 2004/03/05 09:01:54 Goober5000
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* Uber pass at reducing #includes
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* --Goober5000
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*
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* Revision 2.3 2003/03/19 09:05:25 Goober5000
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* more housecleaning, this time for debug warnings
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* --Goober5000
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*
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* Revision 2.2 2002/08/01 01:41:04 penguin
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* The big include file move
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*
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* Revision 2.1 2002/07/29 19:17:21 penguin
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* added #ifdef _WIN32 around windows-specific system headers
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*
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* Revision 2.0 2002/06/03 04:02:21 penguin
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* Warpcore CVS sync
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*
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* Revision 1.1 2002/05/02 18:03:04 mharris
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* Initial checkin - converted filenames and includes to lower case
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*
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*
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* 4 2/22/99 10:31p Andsager
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* Get rid of unneeded includes.
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*
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* 3 1/06/99 2:24p Dave
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* Stubs and release build fixes.
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*
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* 2 10/07/98 10:52a Dave
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* Initial checkin.
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*
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* 1 10/07/98 10:48a Dave
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*
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* 12 5/14/98 8:10p Lawrance
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* Fix bug with trying to read past the end of a file (when from a
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* packfile).
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*
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* 11 5/11/98 11:48a John
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* fixed bug with memory mapped files
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*
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* 10 5/11/98 10:59a John
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* added in debug code
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*
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* 9 5/11/98 10:59a John
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* Moved the low-level file reading code into cfilearchive.cpp.
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*
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* 8 4/30/98 4:53p John
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* Restructured and cleaned up cfile code. Added capability to read off
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* of CD-ROM drive and out of multiple pack files.
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*
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* 7 4/20/98 11:49a Hoffoss
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* Fixed bug with directory name getting.
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*
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* 6 4/10/98 12:18a Hoffoss
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* Make pilot image search in pack file possible.
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*
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* 5 1/19/98 9:37p Allender
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* Great Compiler Warning Purge of Jan, 1998. Used pragma's in a couple
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* of places since I was unsure of what to do with code.
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*
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* 4 12/30/97 5:31p Lawrance
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* fixed problem for people that didn't have a VP file
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*
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* 3 12/30/97 4:31p Sandeep
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* Changed pakfile format
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*
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* 2 12/28/97 12:42p John
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* Put in support for reading archive files; Made missionload use the
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* cf_get_file_list function. Moved demos directory out of data tree.
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*
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* 1 12/28/97 11:48a John
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*
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* $NoKeywords: $
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*/
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#define _CFILE_INTERNAL
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#ifdef _WIN32
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#include <io.h>
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#include <direct.h>
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#include <windows.h>
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#include <winbase.h> /* needed for memory mapping of file functions */
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#endif
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#include "cfile/cfile.h"
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#include "cfile/cfilearchive.h"
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#define CHECK_POSITION
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// Called once to setup the low-level reading code.
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void cf_init_lowlevel_read_code( CFILE * cfile, int offset, int size )
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{
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Assert(cfile != NULL);
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Cfile_block *cb;
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Assert(cfile->id >= 0 && cfile->id < MAX_CFILE_BLOCKS);
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cb = &Cfile_block_list[cfile->id];
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cb->lib_offset = offset;
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cb->raw_position = 0;
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cb->size = size;
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if ( cb->fp ) {
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if ( cb->lib_offset ) {
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fseek( cb->fp, cb->lib_offset, SEEK_SET );
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}
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#if defined(CHECK_POSITION) && !defined(NDEBUG)
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int raw_position;
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raw_position = ftell(cb->fp) - cb->lib_offset;
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Assert(raw_position == cb->raw_position);
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#endif
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}
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}
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// cfeof() Tests for end-of-file on a stream
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//
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// returns a nonzero value after the first read operation that attempts to read
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// past the end of the file. It returns 0 if the current position is not end of file.
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// There is no error return.
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int cfeof(CFILE *cfile)
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{
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Assert(cfile != NULL);
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Cfile_block *cb;
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Assert(cfile->id >= 0 && cfile->id < MAX_CFILE_BLOCKS);
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cb = &Cfile_block_list[cfile->id];
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int result;
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result = 0;
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// cfeof() not supported for memory-mapped files
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Assert( !cb->data );
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Assert(cb->fp != NULL);
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#if defined(CHECK_POSITION) && !defined(NDEBUG)
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int raw_position;
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raw_position = ftell(cb->fp) - cb->lib_offset;
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Assert(raw_position == cb->raw_position);
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#endif
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if (cb->raw_position >= cb->size ) {
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result = 1;
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} else {
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result = 0;
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}
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return result;
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}
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// cftell() returns offset into file
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//
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// returns: success ==> offset into the file
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// error ==> -1
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//
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int cftell( CFILE * cfile )
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{
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Assert(cfile != NULL);
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Cfile_block *cb;
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Assert(cfile->id >= 0 && cfile->id < MAX_CFILE_BLOCKS);
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cb = &Cfile_block_list[cfile->id];
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// Doesn't work for memory mapped files
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Assert( !cb->data );
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Assert(cb->fp != NULL);
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#if defined(CHECK_POSITION) && !defined(NDEBUG)
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int raw_position;
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raw_position = ftell(cb->fp) - cb->lib_offset;
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Assert(raw_position == cb->raw_position);
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#endif
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return cb->raw_position;
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}
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// cfseek() moves the file pointer
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//
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// returns: success ==> 0
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// error ==> non-zero
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//
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int cfseek( CFILE *cfile, int offset, int where )
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{
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Assert(cfile != NULL);
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Cfile_block *cb;
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Assert(cfile->id >= 0 && cfile->id < MAX_CFILE_BLOCKS);
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cb = &Cfile_block_list[cfile->id];
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// TODO: seek to offset in memory mapped file
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Assert( !cb->data );
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Assert( cb->fp != NULL );
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int goal_position;
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switch( where ) {
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case CF_SEEK_SET:
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goal_position = offset+cb->lib_offset;
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break;
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case CF_SEEK_CUR:
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{
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goal_position = cb->raw_position+offset+cb->lib_offset;
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}
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break;
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case CF_SEEK_END:
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goal_position = cb->size+offset+cb->lib_offset;
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break;
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default:
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Int3();
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return 1;
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}
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int result = fseek(cb->fp, goal_position, SEEK_SET );
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cb->raw_position = goal_position - cb->lib_offset;
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#if defined(CHECK_POSITION) && !defined(NDEBUG)
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int tmp_offset;
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tmp_offset = (int)ftell(cb->fp) - cb->lib_offset;
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Assert(tmp_offset==cb->raw_position);
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#endif
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return result;
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}
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// cfread() reads from a file
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//
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// returns: returns the number of full elements read
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//
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//
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int cfread(void *buf, int elsize, int nelem, CFILE *cfile)
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{
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Assert(cfile != NULL);
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Assert(buf != NULL);
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Assert(cfile->id >= 0 && cfile->id < MAX_CFILE_BLOCKS);
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Cfile_block *cb;
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cb = &Cfile_block_list[cfile->id];
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// cfread() not supported for memory-mapped files
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Assert( !cb->data );
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Assert(cb->fp != NULL);
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int size = elsize*nelem;
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Assert(nelem > 0);
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Assert(elsize > 0);
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Assert(size > 0);
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if ( (cb->raw_position+size) > cb->size ) {
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size = cb->size - cb->raw_position;
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if ( size < 1 ) {
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return 0;
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}
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//mprintf(( "CFILE: EOF encountered in file\n" ));
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}
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int bytes_read = fread( buf, 1, size, cb->fp );
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if ( bytes_read > 0 ) {
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cb->raw_position += bytes_read;
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}
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#if defined(CHECK_POSITION) && !defined(NDEBUG)
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int tmp_offset;
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tmp_offset = ftell(cb->fp) - cb->lib_offset;
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Assert(tmp_offset==cb->raw_position);
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#endif
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return bytes_read / elsize;
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}
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