Problems decompressing gzip

Question

I'm trying to use a gzip c++ library to decompress some text that i compressed using this website that had a tool to do it, but when i try to decompress it in my project it says that its not compressed and fails to decompress. Am i just misunderstanding these compression formats because the names are the same or is this some other issue that i'm not aware of?

    //'test message' compressed using the website
    std::string test_string = R"(eJwrSS0uUchNLS5OTE8FAB8fBMY=)";

    //returns false
    bool is_compressed = gzip::is_compressed(test_string.data(), test_string.size());

    //crashes
    std::string decompressed = gzip::decompress(test_string.data(), test_string.size());

Uh, the site compress with GZIP, then show you the Base64 encoded string of the compressed data. Your code doesn't decode that string into byte array — Martheen, Aug 19 '22 at 10:21
See https://stackoverflow.com/questions/180947/base64-decode-snippet-in-c — Martheen, Aug 19 '22 at 10:23
+1 to @Martheen it is because byte array will create non-ASCII characters as well. For your "test message" string, the gzip byte array is "x°+I-.QхM-.NLO�ф" — Manas Singh, Aug 19 '22 at 10:28

score 1 · Answer 1 · edited Aug 19 '22 at 15:52

1

Website outputs a Base64 encoded string as ASCII, instead of the byte array. I need to decode the Base64 encoding before trying to decompress.

edited Aug 19 '22 at 15:52

Mark Adler

101,978
13
118
158

answered Aug 19 '22 at 10:45

bobjafari555

31
4

Problems decompressing gzip

1 Answers1