File: zzxordir.c

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/*
 *	Copyright (c) 2000,2001,2002 Guido Draheim <guidod@gmx.de>
 *      Use freely under the restrictions of the ZLIB license.
 *
 *      show zip-reading with xor-obfuscation. 
 *      Note that the difference to the standard zzdir.c is quite small.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <zzip/zzip.h>
#include <zzip/plugin.h>

#if defined ZZIP_HAVE_UNISTD_H
#include <unistd.h>
#elif defined ZZIP_HAVE_IO_H
#include <io.h>
#else
#error need posix io for this example
#endif

#ifndef O_BINARY
#define O_BINARY 0
#endif

static const char usage[] = 
{
    "zzdir <dir>.. \n"
    "  - prints a content table to stdout, but the dir can also be a zip-arch."
    "\n"
    " the file is part of an inflated zip-archive obfuscated with xor value,\n"
    " given by the numeric option (default is 0x55). \n"
    "\n"
    " To show the contents of a zip-archive named 'test.zip', you may write \n"
    "     zzdir test \n"
};

static int xor_value;

static zzip_ssize_t xor_read (int f, void* p, zzip_size_t l)
{
    zzip_ssize_t r = read(f, p, l);
    zzip_ssize_t x; char* q; for (x=0, q=p; x < r; x++) q[x] ^= xor_value;
    return r;
}

static zzip_plugin_io_handlers xor_handlers = { };
static zzip_strings_t xor_fileext[] = { ".dat", "", 0 };

int 
main (int argc, char ** argv)
{
    int argn;
    int exitcode = 0; 
    xor_value = 0x55;

    if (argc <= 1 || ! strcmp (argv[1], "--help"))
    {
        printf (usage);
        return 0;
    }
    if (! strcmp (argv[1], "--version"))
    {
	printf (__FILE__" version "ZZIP_PACKAGE" "ZZIP_VERSION"\n");
	return 0;
    }

    zzip_init_io (&xor_handlers, 0); xor_handlers.fd.read = &xor_read;
    
    for (argn=1; argn < argc; argn++)
    {
        ZZIP_DIR * dir;
        ZZIP_DIRENT * d;

	if (argv[argn][0] == '-')
	{
	    if (isdigit(argv[argn][1]))	xor_value = atoi (argv[argn]+1);
	    continue;
	}
  
        dir = zzip_opendir_ext_io(argv[argn], 
				  ZZIP_ONLYZIP, xor_fileext, &xor_handlers);
        if (! dir)
        {
            fprintf (stderr, "did not open %s: ", argv[argn]);
            perror(argv[argn]);
	    exitcode++;
            continue;
        }
  
        if (argc > 2) printf ("%s: \n", argv[argn]);

	/* read each dir entry and show one line of info per file */
        while ((d = zzip_readdir (dir)))
        {
	    /* orignalsize / compression-type / compression-ratio / filename */
            if (d->st_size > 999999)
            {
                printf ("%5dK %-9s %2d%% %s \n", 
			d->st_size>>10, 
			zzip_compr_str(d->d_compr), 
			100 - (d->d_csize|1)/((d->st_size/100)|1),
			d->d_name);
            }else{
                printf ("%6d %-9s %2d%% %s \n", 
			d->st_size, 
			zzip_compr_str(d->d_compr), 
			100 - (d->d_csize|1)*100/(d->st_size|1),
			d->d_name);
            }
        }

        zzip_closedir(dir);
    }
    
    return exitcode;
} 

/* 
 * Local variables:
 * c-file-style: "stroustrup"
 * End:
 */