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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <zlib.h>
#include "mystdlib.h"
#define XORLEN (29)
#define HUGEBLOCK (1024*1024)
int main(int argc, char **argv) {
MAP in;
if( argc != 2 ) exit(111);
in = map_file( argv[1], 1 );
unsigned const char xorkey [XORLEN] = "Just for Fun. Linus Torvalds.";
unsigned char input [XORLEN];
unsigned char output [HUGEBLOCK];
char respath[32]; /* file_XXXXX\0 */
int i, zres = 0, filenum = 0, resfile;
size_t offs = 0, reported = 0;
z_stream z; memset( &z, 0, sizeof(z));
while( offs < in->size - XORLEN ) {
for( i=0; i<XORLEN; ++i ) input[i] = in->addr[offs+i] ^ xorkey[i];
z.next_in = input; z.avail_in = XORLEN;
z.next_out = output; z.avail_out = HUGEBLOCK;
inflateInit( &z ); zres = inflate( &z, Z_NO_FLUSH );
if( (zres != Z_OK) && (zres != Z_STREAM_END) )
goto error_continue;
z.next_in = in->addr + offs + XORLEN; z.avail_in = in->size - offs - XORLEN;
while( zres == Z_OK ) zres = inflate( &z, Z_NO_FLUSH );
if( zres != Z_STREAM_END ) {
error_continue:
inflateEnd(&z); memset( &z, 0, sizeof(z));
offs++;
continue;
}
sprintf( respath, "file_%05X", filenum++ );
resfile = open( respath, O_RDWR | O_CREAT, 0644 );
if( resfile < 0 ) {
fprintf( stderr, "Could not open output file %s\n", respath );
exit(1);
}
write( resfile, output, z.total_out );
close( resfile );
offs += z.total_in;
if( reported < ( offs * 10 ) / in->size ) {
reported++;
printf( "%zd%% ", 10 * reported );
fflush( stdout );
}
inflateEnd(&z); memset( &z, 0, sizeof(z));
}
unmap_file(&in);
}
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