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How to find a string in a binary file?


How to find a string in a binary file?

By : Arslan Mehar
Date : October 25 2020, 07:10 AM
wish of those help I think of using find() is an easy way to search for patterns.
code :
void R_Data(const std::string filename, const std::string pattern) {
    std::ifstream(filename, std::ios::binary);
    char buffer[1024];

    while (file.read(buffer, 1024)) {
        std::string temp(buffer, 1024);
        std::size_t pos = 0, old = 0;

        while (pos != std::string::npos) {
            pos = temp.find(pattern, old);
            old = pos + pattern.length();
            if ( pos != std::string::npos )
                std::cout << "Exists" << std::endl;
        }
        file.seekg(pattern.length()-1, std::ios::cur);
    }
}


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Java : How to find string patterns in a LARGE binary file?

Java : How to find string patterns in a LARGE binary file?


By : Thomas Woergaard Kjæ
Date : March 29 2020, 07:55 AM
I hope this helps you . Google "finite state machine".
Or, read the file one byte at a time, if the byte just doesn't match the first character of the search term, go on to the next byte. If it does match, now you're looking for the next character in the sequence. I.e., your state has gone from 0, to 1. If your state equals (or passes) the length of the search string, you found it!
Find most frequent string in a binary file C

Find most frequent string in a binary file C


By : Amber Williams
Date : March 29 2020, 07:55 AM
around this issue To figure out the most frequent course if the binary file is constructed of records in form of exam you need to read the file from the beginning to the end and then have some kind of counter for each course.
This can be done in many ways, e.g. encode each course name to a unique integer and then count ++1 every time you find the same course in the file or you could have a list of courses encountered then search the list - if you find the same course add to counter or add new node in the list with counter = 1
sed: find and replace a string (with characters like $ and space) in a binary file

sed: find and replace a string (with characters like $ and space) in a binary file


By : xiezhengyu
Date : March 29 2020, 07:55 AM
I hope this helps . You just need to add a / at the last because your sed syntax is incorrect. It's like s/search/replace but it should be s/search/replace/optional-modifiers .
code :
sed -i 's/tail +390 \$0 > \$outname/tail -n +390 \$0 > \$outname/' file
$ echo 'tail +390 $0 > $outname' | sed 's/tail +390 \$0 > \$outname/tail -n +390 \$0 > \$outname/'
tail -n +390 $0 > $outname
How to find an integer inside a string representing a binary file

How to find an integer inside a string representing a binary file


By : Murali
Date : March 29 2020, 07:55 AM
Does that help If pe_file_content contains the four bytes 0x24, 0x3E, 0x0C, and 0x10, and not the eight bytes representing them as characters, then you need to convert your DWORD value to a string containing those same bytes, and then you can just search for that:
code :
std::string needle(reinterpret_cast<const char*>(&some_value), sizeof(some_value));
pe_file_content.find(needle);
Using std::find to find chars read from binary file and cast to a std::string in a std::vector<string> creates thi

Using std::find to find chars read from binary file and cast to a std::string in a std::vector<string> creates thi


By : wisinx
Date : March 29 2020, 07:55 AM
Hope that helps std::string query(fileData) uses strlen on fileData to find its terminating 0, but doesn't find one because fileData is not zero-terminated and continues searching for 0 up the stack until it finds it or hits inaccessible memory past the end of the stack and causes SIGSEGV.
Also file.read can read fewer symbols than expected, gcount must be used to extract the actual number of characters last read:
code :
file.read(fileData, sizeof fileData);
auto len = file.gcount();
std::string query(fileData, len);
std::string query;
// ...
    constexpr int LENGTH = 4;
    query.resize(LENGTH);
    file.read(&query[0], LENGTH);
    query.resize(file.gcount());
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