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+/* Unzcrash - A test program written to test robustness to
+ decompression of corrupted data.
+ Inspired by unzcrash.c from Julian Seward's bzip2.
+ Copyright (C) 2008, 2009 Antonio Diaz Diaz.
+
+ This program is free software: you have unlimited permission
+ to copy, distribute and modify it.
+
+ Usage is:
+ unzcrash "lzip -tv" filename.lz
+
+ This program reads the specified file and then repeatedly
+ decompresses it, increasing 256 times each byte of the compressed
+ data, so as to test all possible one-byte errors. This should not
+ cause any invalid memory accesses. If it does, please, report it as
+ a bug.
+
+ Compile this file with the command:
+ g++ -O2 -Wall -W -o unzcrash testsuite/unzcrash.cc
+*/
+
+#include <cstdio>
+#include <cstdlib>
+#include <stdint.h>
+#include <signal.h>
+#include <unistd.h>
+
+
+int main( const int argc, const char * argv[] )
+ {
+ if( argc < 3 )
+ {
+ std::fprintf( stderr, "Usage: unzcrash \"lzip -tv\" filename.lz\n" );
+ return 1;
+ }
+
+ FILE *f = std::fopen( argv[2], "rb" );
+ if( !f )
+ {
+ std::fprintf( stderr, "Can't open file `%s' for reading\n", argv[2] );
+ return 1;
+ }
+
+ const int buffer_size = 1 << 20;
+ uint8_t buffer[buffer_size];
+ const int size = std::fread( buffer, 1, buffer_size, f );
+ if( size >= buffer_size )
+ {
+ std::fprintf( stderr, "input file `%s' too big.\n", argv[2] );
+ return 1;
+ }
+ std::fclose( f );
+
+ f = popen( argv[1], "w" );
+ if( !f )
+ {
+ std::fprintf( stderr, "incorrect parameters or too many files.\n" );
+ return 1;
+ }
+ const int wr = std::fwrite( buffer, 1, size, f );
+ if( wr != size || pclose( f ) != 0 )
+ {
+ std::fprintf( stderr, "Could not run `%s' or other error.\n", argv[1] );
+ return 1;
+ }
+
+ signal( SIGPIPE, SIG_IGN );
+
+ for( int byte = 0; byte < size; ++byte )
+ {
+ std::fprintf( stderr, "byte %d\n", byte );
+ for( int i = 0; i < 255; ++i )
+ {
+ ++buffer[byte];
+ f = popen( argv[1], "w" );
+ if( !f )
+ { std::fprintf( stderr, "Can't open pipe.\n" ); return 1; }
+ std::fwrite( buffer, 1, size, f );
+ pclose( f );
+ }
+ ++buffer[byte];
+ }
+
+ return 0;
+ }