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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 HUGEINBLOCK (128*1024)
#define HUGEBLOCK (4*1024*1024)
int main(int argc, char **argv) {
unsigned const char xorkey [XORLEN] = "Just for Fun. Linus Torvalds.";
unsigned char input [HUGEINBLOCK];
unsigned char output [HUGEBLOCK];
char respath[32]; /* file_XXXXX\0 */
int zres = 0, filenum = 0, resfile;
size_t offs = 0, reported = 0;
ssize_t temp = 0;
MAP in;
if( argc != 2 ) exit(111);
in = map_file( argv[1], 1 );
z_stream z;
while( offs < in->size ) {
/* std::min(remain, HUGEINBLOCK) */
size_t inlen = in->size - offs;
if (inlen > sizeof(input))
inlen = sizeof(input);
/* Copy in block large enough */
memcpy(input, in->addr + offs, inlen);
/* De-"crypt" */
for (size_t i = 0; i < sizeof(xorkey); ++i )
input[i] ^= xorkey[i];
/* Prepare decompression struct */
memset( &z, 0, sizeof(z));
z.next_in = input; z.avail_in = inlen;
z.next_out = output; z.avail_out = HUGEBLOCK;
inflateInit( &z );
zres = Z_OK;
while( zres == Z_OK )
zres = inflate( &z, Z_NO_FLUSH );
if( zres != Z_STREAM_END ) {
inflateEnd(&z);
offs++;
continue;
}
// fprintf( stderr, "%08X\n", (unsigned int)(offs));
//old_offs = offs;
snprintf( respath, sizeof(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);
}
temp += 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);
if( reported < 10 )
printf( "100%% " );
fflush( stdout );
if( !temp )
exit(1);
return 0;
}
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