compression

问题 I want to compress an InputStream using ZipOutputStream and then get the InputStream from compressed ZipOutputStream without saving file on disc. Is that possible? 回答1: I figured it out: public InputStream getCompressed( InputStream is ) throws IOException { byte data[] = new byte[2048]; ByteArrayOutputStream bos = new ByteArrayOutputStream(); ZipOutputStream zos = new ZipOutputStream( bos ); BufferedInputStream entryStream = new BufferedInputStream( is, 2048); ZipEntry entry = new ZipEntry(

问题 i'm having trouble packing a bunch of files into one archive. the boost docs are very limited on this topic and i've searched the web for several hours now, but i can't find a solution. What i have so far: boost::filesystem::ofstream ofsArchive("some.zip"); boost::iostreams::filtering_ostreambuf outFilter; boost::iostreams::zlib_params zparam(boost::iostreams::zlib::default_compression); try { // set up the filter outFilter.strict_sync(); outFilter.push(boost::iostreams::zlib_compressor

问题 I am developing an app which has a lot of images to work on due to which the size of my app has become very large. I want to compress or something like that to reduce the size of app. Any idea? 回答1: .png -files which are placed in the res/drawable are automatically optimized when compiling your app: Bitmap files may be automatically optimized with lossless image compression by the aapt tool during the build process. For example, a true-color PNG that does not require more than 256 colors may

问题 I am developing an app which has a lot of images to work on due to which the size of my app has become very large. I want to compress or something like that to reduce the size of app. Any idea? 回答1: .png -files which are placed in the res/drawable are automatically optimized when compiling your app: Bitmap files may be automatically optimized with lossless image compression by the aapt tool during the build process. For example, a true-color PNG that does not require more than 256 colors may

问题 I'm just curious as to why this choice was made - it basically rules out changing the compression algorithm used by Git - because it doesn't use the SHA1 of the raw blobs. Perhaps there is some efficiency consideration here. Maybe ZLIB is faster at compressing a file than the SHA1 algorithm is at creating the hash, so therefore compressing before hashing is faster? Here is a link to the original Git READMEby Linus: http://git.kernel.org/?p=git/git.git;a=blob;f=README;h

问题 I'm just curious as to why this choice was made - it basically rules out changing the compression algorithm used by Git - because it doesn't use the SHA1 of the raw blobs. Perhaps there is some efficiency consideration here. Maybe ZLIB is faster at compressing a file than the SHA1 algorithm is at creating the hash, so therefore compressing before hashing is faster? Here is a link to the original Git READMEby Linus: http://git.kernel.org/?p=git/git.git;a=blob;f=README;h

问题 Summary: I am having trouble to get the JCL compression library to open any spanned archives. It presents the error "(0000001) Incorrect Function" as defined in borlands 'windows.pas'; scenerios: A single archive compressed using the JCL compression example. -Will uncompress in both the JCL example and the 7zip gui. A spanned archive over 7 files compressed using the JCL compression example. -Will uncompress in only the 7zip gui. Fails to uncompress using JCL example. A single archive

问题 I'm using the standard VB.NET libraries for extracting and compressing files. It works as well but the problem comes when I have to extract and files exist already. Code I use Imports: Imports System.IO.Compression Method I call when it crashes ZipFile.ExtractToDirectory(archivedir, BaseDir) archivedir and BaseDir are set as well, in fact it works if there are no files to overwrite. The problem comes exactly when there are. How can I overwrite files in extraction without use thirdy-part

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 16 days ago . I want to create a self-executable archive using Makeself. I referred to makeself.io but didn't understand anything from it. What are the steps for making a Makeself self-executable archive? If I run this executable on any operating system then it should be work and do my required task. 回答1: Here I am giving

问题 Follow up of Question: Java: how to compress a byte[] using ZipOutputStream without intermediate file I can zip data without an intermediate file (or memory file). I now need to zip chunks of data and add them to a single zip file. I am using a single ZipOutputStream as suggested in the previous question. String infile = "test.txt"; FileInputStream in = new FileInputStream(infile); String outfile = "test.txt.zip"; FileOutputStream out = new FileOutputStream(outfile); ByteArrayOutputStream