infgen | Deflate disassember to convert a deflate , zlib , or gzip | Cloud Functions library

 by   madler C Version: Current License: No License

kandi X-RAY | infgen Summary

kandi X-RAY | infgen Summary

infgen is a C library typically used in Serverless, Cloud Functions applications. infgen has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Deflate disassember to convert a deflate, zlib, or gzip stream into a readable form.
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              infgen has a low active ecosystem.
              It has 74 star(s) with 12 fork(s). There are 11 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 1 open issues and 1 have been closed. On average issues are closed in 12 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of infgen is current.

            kandi-Quality Quality

              infgen has 0 bugs and 0 code smells.

            kandi-Security Security

              infgen has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              infgen code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              infgen does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              infgen releases are not available. You will need to build from source code and install.
              Installation instructions, examples and code snippets are available.

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            infgen Key Features

            No Key Features are available at this moment for infgen.

            infgen Examples and Code Snippets

            No Code Snippets are available at this moment for infgen.

            Community Discussions

            QUESTION

            decoding deflate blocks after (HCLEN + 4) x 3 bits
            Asked 2021-Dec-20 at 09:38

            So in the deflate algorithm each block starts off with a 3 bit header:

            ...

            ANSWER

            Answered 2021-Dec-20 at 09:38

            The next (HCLEN + 4) x 3 bits represent the code lengths.

            The number of lens's has nothing to do with HCLEN. The sequence of zeros and lens represent the 269 (259+10) literal/length and distance codes code lengths. If you add up the zeros and the number of lens, you get 269.

            A zero-length symbol means it does not appear in the compressed data. There are no literal bytes in the data in the range 0..64, so it starts with 65 zeros. The first symbol coded is then an 'A', with length 3.

            Source https://stackoverflow.com/questions/70413287

            QUESTION

            How to extract the encoding dictionary from gzip archives
            Asked 2021-Sep-14 at 21:03

            I am looking for a method whereby I can extract the encoding dictionary made by DEFLATE algorithm from a gzip archive.

            I need the LZ77 made pointers from the whole archive which refer to patterns from the file as well as the Huffman tree with the aforementioned pointers.

            Is there any solution in python?

            Does anyone know the https://github.com/madler/infgen/blob/master/infgen.c which might provide the dictionary?

            ...

            ANSWER

            Answered 2021-Sep-14 at 21:03

            The "dictionary" used for compression at any point in the input is nothing more than the 32K bytes of uncompressed data that precede that point.

            Yes, infgen will disassemble a deflate stream, showing all of the LZ77 references and the derived Huffman codes in a readable form. You could run infgen from Python and interpret the output in Python.

            infgen also has a -b option for a non-human-readable binary format that might be faster to process for what you want to do.

            Source https://stackoverflow.com/questions/69179042

            QUESTION

            DEFLATE: how to handle "no distance codes" case?
            Asked 2021-Aug-07 at 15:43

            I mostly get RFC 1951, however I'm not too clear on how to manage the case where (when using dynamic Huffman tables) no distance codes are needed or present. For example, let's take the input:

            ...

            ANSWER

            Answered 2021-Aug-07 at 15:43

            If there are no matches in the deflate block, there will be no lengths from the length/literal code, and so the decoder will never look for a distance code. In that case, what would make the most sense is to provide no information at all about a distance code.

            However the format does not permit that, since the 5-bit HDIST value in the header is interpreted as 1 to 32 distance codes, for which lengths must be provided for in the header. You must provide at least one distance code length in the header, even though it will never be used.

            There are several valid things you can do in that case. RFC 1951 notes you can provide a single distance code (HDIST == 0, meaning one length), with length zero, which would be just one zero in the list of lengths.

            It is also permitted to provide a single code of length one, or you could do as zlib is doing, which is to provide two codes of length one. You can actually put any valid distance code description you like there, and it will still be accepted.

            As to why zlib's deflate is choosing to define two codes there, I can only guess that Jean-loup was being conservative, writing something he knew that even an over-simplified inflator would have to accept. Both gzip and zopfli do the same thing. They all do the same thing when there is only one distance code used. They could emit just the single one-bit distance code, per the RFC, but they emit two single-bit distance codes, one of which is never used.

            Really the right thing to do would be to write a single zero length as noted in the RFC, which would take the fewest number of bits in the header. I will consider updating zlib to do that, to eke out a few more bits of compression.

            Source https://stackoverflow.com/questions/68668444

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install infgen

            Simply compile infgen.c, and provide the compressed data to stdin. The disassembled output will be written to stdout.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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          • HTTPS

            https://github.com/madler/infgen.git

          • CLI

            gh repo clone madler/infgen

          • sshUrl

            git@github.com:madler/infgen.git

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