268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/*
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Copyright (C) 2004 Michael Liebscher
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* zipfile.c: Write zip file
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*
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* Author: Michael Liebscher <johnnycanuck@users.sourceforge.net>
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*
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*/
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/*
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Notes:
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Reference document:
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http://www.pkware.com/company/standards/appnote/appnote.txt
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*/
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#include <stdio.h>
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#include "../../../common/arch.h"
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#include "../../../common/common_utils.h"
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#include "zip.h"
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/* Signatures for zip file information headers */
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#define SIG_LOCAL 0x04034b50L
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#define SIG_CENTRAL 0x02014b50L
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#define SIG_END 0x06054b50L
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#define SIG_EXTENDLOCAL 0x08074b50L
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#define SIG_EXTENDSPLOCAL 0x30304b50L
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/* Length of header (not counting the signature) */
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#define LOCALHEAD_SIZE 26
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#define CENTRALHEAD_SIZE 42
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#define ENDHEAD_SIZE 18
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/*
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-----------------------------------------------------------------------------
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Function: zip_writelocalfileheader -Write a local header to file.
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Parameters:
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z -[in] zip entry to write local header for.
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f -[in] File to write to.
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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_boolean zip_writelocalfileheader( struct zlist *z, FILE *f )
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{
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W32 temp32;
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W16 temp16;
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W32 retval;
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temp32 = LittleLong( SIG_LOCAL );
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retval = fwrite( &temp32, 1, 4, f );
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temp16 = LittleShort( z->versionneeded );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->localflag );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->compression_method );
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retval += fwrite( &temp16, 1, 2, f );
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temp32 = LittleLong( z->timedate );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->crc32 );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->compressed_size );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->uncompressed_size );
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retval += fwrite( &temp32, 1, 4, f );
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temp16 = LittleShort( z->filename_length );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->extrafield_length );
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retval += fwrite( &temp16, 1, 2, f );
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if( retval != LOCALHEAD_SIZE + 4 )
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{
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return false;
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}
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if( fwrite( z->filename, 1, z->filename_length, f ) != z->filename_length ||
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(z->extrafield && fwrite( z->extrafield, 1, z->extrafield_length, f) != z->extrafield_length) )
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{
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return false;
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}
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return true;
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}
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/*
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-----------------------------------------------------------------------------
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Function: zip_writecentral -Write a central header to file.
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Parameters:
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z -[in] zip entry to write central header for.
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f -[in] File to write to.
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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_boolean zip_writecentral( struct zlist *z, FILE *f )
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{
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W32 temp32;
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W16 temp16;
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W32 retval;
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temp32 = LittleLong( SIG_CENTRAL );
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retval = fwrite( &temp32, 1, 4, f );
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temp16 = LittleShort( z->versionmadeby );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->versionneeded );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->flag );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->compression_method );
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retval += fwrite( &temp16, 1, 2, f );
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temp32 = LittleLong( z->timedate );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->crc32 );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->compressed_size );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->uncompressed_size );
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retval += fwrite( &temp32, 1, 4, f );
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temp16 = LittleShort( z->filename_length );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->centralextra_length );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->comment_length );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->disknumstart );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( z->internalattribute );
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retval += fwrite( &temp16, 1, 2, f );
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temp32 = LittleLong( z->externalattribute );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( z->offset );
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retval += fwrite( &temp32, 1, 4, f );
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if( retval != CENTRALHEAD_SIZE + 4 )
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{
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return false;
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}
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if( fwrite(z->filename, 1, z->filename_length, f) != z->filename_length ||
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(z->centralextra_length && fwrite(z->centralextra, 1, z->centralextra_length, f) != z->centralextra_length) ||
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(z->comment_length && fwrite(z->comment, 1, z->comment_length, f) != z->comment_length) )
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{
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return false;
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}
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return true;
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}
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/*
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-----------------------------------------------------------------------------
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Function: zip_writeend -Write end of central directory data to file.
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Parameters:
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num -[in] Number of entries in central directory.
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size -[in] Size of central directory.
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offset -[in] Offset of central directory.
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len -[in] Length of zip file comment (0 if none).
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comment -[in] Zip file comment if len != 0.
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f -[in] File to write to.
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Returns:
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Notes:
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-----------------------------------------------------------------------------
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*/
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_boolean zip_writeend( SW32 num, W32 size, W32 offset, W16 len, char *comment, FILE *f )
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{
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W32 temp32;
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W16 temp16;
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W32 retval;
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temp32 = LittleLong( SIG_END );
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retval = fwrite( &temp32, 1, 4, f );
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temp16 = 0;
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = 0;
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( num );
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retval += fwrite( &temp16, 1, 2, f );
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temp16 = LittleShort( num );
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retval += fwrite( &temp16, 1, 2, f );
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temp32 = LittleLong( size );
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retval += fwrite( &temp32, 1, 4, f );
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temp32 = LittleLong( offset );
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retval += fwrite( &temp32, 1, 4, f );
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temp16 = LittleShort( len );
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retval += fwrite( &temp16, 1, 2, f );
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if( retval != ENDHEAD_SIZE + 4 )
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{
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return false;
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}
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if( len && fwrite( comment, 1, len, f ) != len )
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{
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return false;
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}
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return true;
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}
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