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/* A test program written to test robustness to decompression of
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corrupted data. Usage is
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and the program will read the specified file, compress it (in memory),
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and then repeatedly decompress it, each time with a different bit of
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the compressed data inverted, so as to test all possible one-bit errors.
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This should not cause any invalid memory accesses. If it does,
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I want to know about it!
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PS. As you can see from the above description, the process is
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incredibly slow. A file of size eg 5KB will cause it to run for
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/* ------------------------------------------------------------------
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This file is part of bzip2/libbzip2, a program and library for
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lossless, block-sorting data compression.
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bzip2/libbzip2 version 1.0.6 of 6 September 2010
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Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
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Please read the WARNING, DISCLAIMER and PATENTS sections in the
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This program is released under the terms of the license contained
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------------------------------------------------------------------ */
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#define M_BLOCK 1000000
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typedef unsigned char uchar;
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#define M_BLOCK_OUT (M_BLOCK + 1000000)
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uchar outbuf[M_BLOCK_OUT];
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uchar zbuf[M_BLOCK + 600 + (M_BLOCK / 100)];
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static char *bzerrorstrings[] = {
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,"???" /* for future */
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,"???" /* for future */
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,"???" /* for future */
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,"???" /* for future */
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,"???" /* for future */
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,"???" /* for future */
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void flip_bit ( int bit )
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uchar mask = 1 << bitno;
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//fprintf ( stderr, "(byte %d bit %d mask %d)",
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// byteno, bitno, (int)mask );
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int main ( int argc, char** argv )
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fprintf ( stderr, "usage: unzcrash filename\n" );
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f = fopen ( argv[1], "r" );
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fprintf ( stderr, "unzcrash: can't open %s\n", argv[1] );
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nIn = fread ( inbuf, 1, M_BLOCK, f );
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fprintf ( stderr, "%d bytes read\n", nIn );
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r = BZ2_bzBuffToBuffCompress (
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zbuf, &nZ, inbuf, nIn, 9, 0, 30 );
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fprintf ( stderr, "%d after compression\n", nZ );
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for (bit = 0; bit < nZ*8; bit++) {
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fprintf ( stderr, "bit %d ", bit );
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r = BZ2_bzBuffToBuffDecompress (
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outbuf, &nOut, zbuf, nZ, 0, 0 );
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fprintf ( stderr, " %d %s ", r, bzerrorstrings[-r] );
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fprintf ( stderr, "\n" );
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fprintf(stderr, "nIn/nOut mismatch %d %d\n", nIn, nOut );
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for (i = 0; i < nOut; i++)
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if (inbuf[i] != outbuf[i]) {
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fprintf(stderr, "mismatch at %d\n", i );
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if (i == nOut) fprintf(stderr, "really ok!\n" );
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assert (nOut == nIn);
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for (i = 0; i < nOut; i++) {
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if (inbuf[i] != outbuf[i]) {
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fprintf ( stderr, "difference at %d !\n", i );
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fprintf ( stderr, "all ok\n" );