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* Copyright (c) 2000,2001,2002 Guido Draheim <guidod@gmx.de>
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* Use freely under the restrictions of the ZLIB License
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* show zip-reading with xor-obfuscation.
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* Note that the difference to the standard zzcat.c is quite small.
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#include <zzip/zzip.h>
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#include <zzip/plugin.h>
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#if defined ZZIP_HAVE_UNISTD_H
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#elif defined ZZIP_HAVE_IO_H
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#error need posix io for this example
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static const char usage[] =
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" zzxorcat [-#] <file>... \n"
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" - prints the file to stdout, so you may want to redirect the output; \n"
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" the file is part of an inflated zip-archive obfuscated with xor value,\n"
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" given by the numeric option (default is 0x55). \n"
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" to get 'README' from dist.dat you may write \n"
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" zzcat dist/README \n"
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static zzip_ssize_t xor_read (int f, void* p, zzip_size_t l)
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zzip_ssize_t r = read(f, p, l);
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zzip_ssize_t x; char* q; for (x=0, q=p; x < r; x++) q[x] ^= xor_value;
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static zzip_plugin_io_handlers xor_handlers;
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static zzip_strings_t xor_fileext[] = { ".dat", "", 0 };
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main (int argc, char ** argv)
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if (argc <= 1 || ! strcmp (argv[1], "--help"))
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if (! strcmp (argv[1], "--version"))
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printf (__FILE__" version "ZZIP_PACKAGE" "ZZIP_VERSION"\n");
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zzip_init_io (&xor_handlers, 0); xor_handlers.fd.read = &xor_read;
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for (argn=1; argn < argc; argn++)
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if (argv[argn][0] == '-')
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if (isdigit(argv[argn][1])) xor_value = atoi (argv[argn]+1);
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fp = zzip_open_ext_io (argv[argn], O_RDONLY|O_BINARY,
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ZZIP_CASELESS|ZZIP_ONLYZIP,
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xor_fileext, &xor_handlers);
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/* read chunks of 16 bytes into buf and print them to stdout */
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while (0 < (n = zzip_read(fp, buf, 16)))
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write (STDOUT_FILENO, buf, n);
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fwrite (buf, 1, n, stdout);
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* c-file-style: "stroustrup"